unit glext;
{
  $Id: glext.pas,v 1.6 2007/05/20 20:28:31 savage Exp $
  
}
(**************************************************
 *        OpenGL extension loading library        *
 * Generated by MetaGLext, written by Tom Nuydens *
 *  (tom@delphi3d.net -- http://www.delphi3d.net  *
 **************************************************)

{
  $Log: glext.pas,v $
  Revision 1.6  2007/05/20 20:28:31  savage
  Initial Changes to Handle 64 Bits

  Revision 1.5  2006/01/11 22:39:02  drellis
  Updated to Support Up to OpenGL 2.0

  Revision 1.4  2005/01/05 00:28:40  savage
  Forgot to wrap a couple of Load_WGL function calls with an IFDEF WIN32. Fixed so now compiles under Linux as well.

  Revision 1.3  2004/08/24 19:33:06  savage
  Removed declarations of SDL_GL_GetProcAddress as the correct ones are in sdl.pas.

  Revision 1.2  2004/08/09 00:38:01  savage
  Updated to Tom's latest version. May contains bugs, but I hope not.

  Revision 1.1  2004/03/30 21:53:54  savage
  Moved to it's own folder.

  Revision 1.6  2004/03/28 00:28:43  savage
  Fixed some glSecondaryColor definitions...

  Revision 1.5  2004/02/20 17:18:16  savage
  Forgot to prefix function pointer with @ for FPC and other Pascal compilers.

  Revision 1.4  2004/02/20 17:09:55  savage
  Code tidied up in gl, glu and glut, while extensions in glext.pas are now loaded using SDL_GL_GetProcAddress, thus making it more cross-platform compatible, but now more tied to SDL.

  Revision 1.3  2004/02/14 22:36:29  savage
  Fixed inconsistencies of using LoadLibrary and LoadModule.
  Now all units make use of LoadModule rather than LoadLibrary and other dynamic proc procedures.

  Revision 1.2  2004/02/14 00:09:19  savage
  Changed uses to now make use of moduleloader.pas rather than dllfuncs.pas

  Revision 1.1  2004/02/05 00:08:19  savage
  Module 1.0 release

  Revision 1.7  2003/06/02 12:32:13  savage
  Modified Sources to avoid warnings with Delphi by moving CVS Logging to the top of the header files. Hopefully CVS Logging still works.

}

interface

{$I jedi-sdl.inc}

uses
  SysUtils,
{$IFDEF __GPC__}
  gpc,
{$ENDIF}

{$IFDEF WINDOWS}
  Windows,
{$ENDIF}
  moduleloader,
  gl;

// Test if the given extension name is present in the given extension string.
function glext_ExtensionSupported(const extension: PChar; const searchIn: PChar): Boolean;

// Load a Specific Extension
function glext_LoadExtension(ext: String): Boolean;
// Some types that were introduced by extensions:
type
  GLintptrARB = Integer;
  PGLintptrARB = ^GLintptrARB;

  GLsizeiptrARB = Integer;
  PGLsizeiptrARB = ^GLsizeiptrARB;

  GLcharARB = Char;
  PGLcharARB = ^GLcharARB;

  GLhandleARB = Cardinal;
  PGLhandleARB = ^GLhandleARB;

  GLintptr = Integer;
  PGLintptr = ^GLintptr;

  GLsizeiptr = Integer;
  PGLsizeiptr = ^GLsizeiptr;

  GLchar = Char;
  PGLchar = ^GLchar;

//***** GL_version_1_2 *****//
const
  GL_UNSIGNED_BYTE_3_3_2 = $8032;
  GL_UNSIGNED_SHORT_4_4_4_4 = $8033;
  GL_UNSIGNED_SHORT_5_5_5_1 = $8034;
  GL_UNSIGNED_INT_8_8_8_8 = $8035;
  GL_UNSIGNED_INT_10_10_10_2 = $8036;
  GL_RESCALE_NORMAL = $803A;
  GL_UNSIGNED_BYTE_2_3_3_REV = $8362;
  GL_UNSIGNED_SHORT_5_6_5 = $8363;
  GL_UNSIGNED_SHORT_5_6_5_REV = $8364;
  GL_UNSIGNED_SHORT_4_4_4_4_REV = $8365;
  GL_UNSIGNED_SHORT_1_5_5_5_REV = $8366;
  GL_UNSIGNED_INT_8_8_8_8_REV = $8367;
  GL_UNSIGNED_INT_2_10_10_10_REV = $8368;
  GL_BGR = $80E0;
  GL_BGRA = $80E1;
  GL_MAX_ELEMENTS_VERTICES = $80E8;
  GL_MAX_ELEMENTS_INDICES = $80E9;
  GL_CLAMP_TO_EDGE = $812F;
  GL_TEXTURE_MIN_LOD = $813A;
  GL_TEXTURE_MAX_LOD = $813B;
  GL_TEXTURE_BASE_LEVEL = $813C;
  GL_TEXTURE_MAX_LEVEL = $813D;
  GL_LIGHT_MODEL_COLOR_CONTROL = $81F8;
  GL_SINGLE_COLOR = $81F9;
  GL_SEPARATE_SPECULAR_COLOR = $81FA;
  GL_SMOOTH_POINT_SIZE_RANGE = $0B12;
  GL_SMOOTH_POINT_SIZE_GRANULARITY = $0B13;
  GL_SMOOTH_LINE_WIDTH_RANGE = $0B22;
  GL_SMOOTH_LINE_WIDTH_GRANULARITY = $0B23;
  GL_ALIASED_POINT_SIZE_RANGE = $846D;
  GL_ALIASED_LINE_WIDTH_RANGE = $846E;
  GL_PACK_SKIP_IMAGES = $806B;
  GL_PACK_IMAGE_HEIGHT = $806C;
  GL_UNPACK_SKIP_IMAGES = $806D;
  GL_UNPACK_IMAGE_HEIGHT = $806E;
  GL_TEXTURE_3D = $806F;
  GL_PROXY_TEXTURE_3D = $8070;
  GL_TEXTURE_DEPTH = $8071;
  GL_TEXTURE_WRAP_R = $8072;
  GL_MAX_3D_TEXTURE_SIZE = $8073;
var
  glDrawRangeElements: procedure(mode: GLenum; start: GLuint; _end: GLuint; count: GLsizei; _type: GLenum; const indices: PGLvoid); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glTexImage3D: procedure(target: GLenum; level: GLint; internalformat: GLint; width: GLsizei; height: GLsizei; depth: GLsizei; border: GLint; format: GLenum; _type: GLenum; const pixels: PGLvoid); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glTexSubImage3D: procedure(target: GLenum; level: GLint; xoffset: GLint; yoffset: GLint; zoffset: GLint; width: GLsizei; height: GLsizei; depth: GLsizei; format: GLenum; _type: GLenum; const pixels: PGLvoid); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glCopyTexSubImage3D: procedure(target: GLenum; level: GLint; xoffset: GLint; yoffset: GLint; zoffset: GLint; x: GLint; y: GLint; width: GLsizei; height: GLsizei); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}

function Load_GL_version_1_2: Boolean;

//***** GL_ARB_imaging *****//
const
  GL_CONSTANT_COLOR = $8001;
  GL_ONE_MINUS_CONSTANT_COLOR = $8002;
  GL_CONSTANT_ALPHA = $8003;
  GL_ONE_MINUS_CONSTANT_ALPHA = $8004;
  GL_BLEND_COLOR = $8005;
  GL_FUNC_ADD = $8006;
  GL_MIN = $8007;
  GL_MAX = $8008;
  GL_BLEND_EQUATION = $8009;
  GL_FUNC_SUBTRACT = $800A;
  GL_FUNC_REVERSE_SUBTRACT = $800B;
  GL_CONVOLUTION_1D = $8010;
  GL_CONVOLUTION_2D = $8011;
  GL_SEPARABLE_2D = $8012;
  GL_CONVOLUTION_BORDER_MODE = $8013;
  GL_CONVOLUTION_FILTER_SCALE = $8014;
  GL_CONVOLUTION_FILTER_BIAS = $8015;
  GL_REDUCE = $8016;
  GL_CONVOLUTION_FORMAT = $8017;
  GL_CONVOLUTION_WIDTH = $8018;
  GL_CONVOLUTION_HEIGHT = $8019;
  GL_MAX_CONVOLUTION_WIDTH = $801A;
  GL_MAX_CONVOLUTION_HEIGHT = $801B;
  GL_POST_CONVOLUTION_RED_SCALE = $801C;
  GL_POST_CONVOLUTION_GREEN_SCALE = $801D;
  GL_POST_CONVOLUTION_BLUE_SCALE = $801E;
  GL_POST_CONVOLUTION_ALPHA_SCALE = $801F;
  GL_POST_CONVOLUTION_RED_BIAS = $8020;
  GL_POST_CONVOLUTION_GREEN_BIAS = $8021;
  GL_POST_CONVOLUTION_BLUE_BIAS = $8022;
  GL_POST_CONVOLUTION_ALPHA_BIAS = $8023;
  GL_HISTOGRAM = $8024;
  GL_PROXY_HISTOGRAM = $8025;
  GL_HISTOGRAM_WIDTH = $8026;
  GL_HISTOGRAM_FORMAT = $8027;
  GL_HISTOGRAM_RED_SIZE = $8028;
  GL_HISTOGRAM_GREEN_SIZE = $8029;
  GL_HISTOGRAM_BLUE_SIZE = $802A;
  GL_HISTOGRAM_ALPHA_SIZE = $802B;
  GL_HISTOGRAM_LUMINANCE_SIZE = $802C;
  GL_HISTOGRAM_SINK = $802D;
  GL_MINMAX = $802E;
  GL_MINMAX_FORMAT = $802F;
  GL_MINMAX_SINK = $8030;
  GL_TABLE_TOO_LARGE = $8031;
  GL_COLOR_MATRIX = $80B1;
  GL_COLOR_MATRIX_STACK_DEPTH = $80B2;
  GL_MAX_COLOR_MATRIX_STACK_DEPTH = $80B3;
  GL_POST_COLOR_MATRIX_RED_SCALE = $80B4;
  GL_POST_COLOR_MATRIX_GREEN_SCALE = $80B5;
  GL_POST_COLOR_MATRIX_BLUE_SCALE = $80B6;
  GL_POST_COLOR_MATRIX_ALPHA_SCALE = $80B7;
  GL_POST_COLOR_MATRIX_RED_BIAS = $80B8;
  GL_POST_COLOR_MATRIX_GREEN_BIAS = $80B9;
  GL_POST_COLOR_MATRIX_BLUE_BIAS = $80BA;
  GL_POST_COLOR_MATIX_ALPHA_BIAS = $80BB;
  GL_COLOR_TABLE = $80D0;
  GL_POST_CONVOLUTION_COLOR_TABLE = $80D1;
  GL_POST_COLOR_MATRIX_COLOR_TABLE = $80D2;
  GL_PROXY_COLOR_TABLE = $80D3;
  GL_PROXY_POST_CONVOLUTION_COLOR_TABLE = $80D4;
  GL_PROXY_POST_COLOR_MATRIX_COLOR_TABLE = $80D5;
  GL_COLOR_TABLE_SCALE = $80D6;
  GL_COLOR_TABLE_BIAS = $80D7;
  GL_COLOR_TABLE_FORMAT = $80D8;
  GL_COLOR_TABLE_WIDTH = $80D9;
  GL_COLOR_TABLE_RED_SIZE = $80DA;
  GL_COLOR_TABLE_GREEN_SIZE = $80DB;
  GL_COLOR_TABLE_BLUE_SIZE = $80DC;
  GL_COLOR_TABLE_ALPHA_SIZE = $80DD;
  GL_COLOR_TABLE_LUMINANCE_SIZE = $80DE;
  GL_COLOR_TABLE_INTENSITY_SIZE = $80DF;
  GL_IGNORE_BORDER = $8150;
  GL_CONSTANT_BORDER = $8151;
  GL_WRAP_BORDER = $8152;
  GL_REPLICATE_BORDER = $8153;
  GL_CONVOLUTION_BORDER_COLOR = $8154;
var
  glColorTable: procedure(target: GLenum; internalformat: GLenum; width: GLsizei; format: GLenum; _type: GLenum; const table: PGLvoid); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glColorTableParameterfv: procedure(target: GLenum; pname: GLenum; const params: PGLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glColorTableParameteriv: procedure(target: GLenum; pname: GLenum; const params: PGLint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glCopyColorTable: procedure(target: GLenum; internalformat: GLenum; x: GLint; y: GLint; width: GLsizei); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glGetColorTable: procedure(target: GLenum; format: GLenum; _type: GLenum; table: PGLvoid); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glGetColorTableParameterfv: procedure(target: GLenum; pname: GLenum; params: PGLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glGetColorTableParameteriv: procedure(target: GLenum; pname: GLenum; params: PGLint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glColorSubTable: procedure(target: GLenum; start: GLsizei; count: GLsizei; format: GLenum; _type: GLenum; const data: PGLvoid); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glCopyColorSubTable: procedure(target: GLenum; start: GLsizei; x: GLint; y: GLint; width: GLsizei); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glConvolutionFilter1D: procedure(target: GLenum; internalformat: GLenum; width: GLsizei; format: GLenum; _type: GLenum; const image: PGLvoid); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glConvolutionFilter2D: procedure(target: GLenum; internalformat: GLenum; width: GLsizei; height: GLsizei; format: GLenum; _type: GLenum; const image: PGLvoid); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glConvolutionParameterf: procedure(target: GLenum; pname: GLenum; params: GLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glConvolutionParameterfv: procedure(target: GLenum; pname: GLenum; const params: PGLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glConvolutionParameteri: procedure(target: GLenum; pname: GLenum; params: GLint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glConvolutionParameteriv: procedure(target: GLenum; pname: GLenum; const params: PGLint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glCopyConvolutionFilter1D: procedure(target: GLenum; internalformat: GLenum; x: GLint; y: GLint; width: GLsizei); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glCopyConvolutionFilter2D: procedure(target: GLenum; internalformat: GLenum; x: GLint; y: GLint; width: GLsizei; height: GLsizei); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glGetConvolutionFilter: procedure(target: GLenum; format: GLenum; _type: GLenum; image: PGLvoid); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glGetConvolutionParameterfv: procedure(target: GLenum; pname: GLenum; params: PGLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glGetConvolutionParameteriv: procedure(target: GLenum; pname: GLenum; params: PGLint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glGetSeparableFilter: procedure(target: GLenum; format: GLenum; _type: GLenum; row: PGLvoid; column: PGLvoid; span: PGLvoid); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glSeparableFilter2D: procedure(target: GLenum; internalformat: GLenum; width: GLsizei; height: GLsizei; format: GLenum; _type: GLenum; const row: PGLvoid; const column: PGLvoid); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glGetHistogram: procedure(target: GLenum; reset: GLboolean; format: GLenum; _type: GLenum; values: PGLvoid); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glGetHistogramParameterfv: procedure(target: GLenum; pname: GLenum; params: PGLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glGetHistogramParameteriv: procedure(target: GLenum; pname: GLenum; params: PGLint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glGetMinmax: procedure(target: GLenum; reset: GLboolean; format: GLenum; _type: GLenum; values: PGLvoid); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glGetMinmaxParameterfv: procedure(target: GLenum; pname: GLenum; params: PGLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glGetMinmaxParameteriv: procedure(target: GLenum; pname: GLenum; params: PGLint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glHistogram: procedure(target: GLenum; width: GLsizei; internalformat: GLenum; sink: GLboolean); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glMinmax: procedure(target: GLenum; internalformat: GLenum; sink: GLboolean); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glResetHistogram: procedure(target: GLenum); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glResetMinmax: procedure(target: GLenum); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glBlendEquation: procedure(mode: GLenum); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glBlendColor: procedure(red: GLclampf; green: GLclampf; blue: GLclampf; alpha: GLclampf); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}

function Load_GL_ARB_imaging: Boolean;

//***** GL_version_1_3 *****//
const
  GL_TEXTURE0 = $84C0;
  GL_TEXTURE1 = $84C1;
  GL_TEXTURE2 = $84C2;
  GL_TEXTURE3 = $84C3;
  GL_TEXTURE4 = $84C4;
  GL_TEXTURE5 = $84C5;
  GL_TEXTURE6 = $84C6;
  GL_TEXTURE7 = $84C7;
  GL_TEXTURE8 = $84C8;
  GL_TEXTURE9 = $84C9;
  GL_TEXTURE10 = $84CA;
  GL_TEXTURE11 = $84CB;
  GL_TEXTURE12 = $84CC;
  GL_TEXTURE13 = $84CD;
  GL_TEXTURE14 = $84CE;
  GL_TEXTURE15 = $84CF;
  GL_TEXTURE16 = $84D0;
  GL_TEXTURE17 = $84D1;
  GL_TEXTURE18 = $84D2;
  GL_TEXTURE19 = $84D3;
  GL_TEXTURE20 = $84D4;
  GL_TEXTURE21 = $84D5;
  GL_TEXTURE22 = $84D6;
  GL_TEXTURE23 = $84D7;
  GL_TEXTURE24 = $84D8;
  GL_TEXTURE25 = $84D9;
  GL_TEXTURE26 = $84DA;
  GL_TEXTURE27 = $84DB;
  GL_TEXTURE28 = $84DC;
  GL_TEXTURE29 = $84DD;
  GL_TEXTURE30 = $84DE;
  GL_TEXTURE31 = $84DF;
  GL_ACTIVE_TEXTURE = $84E0;
  GL_CLIENT_ACTIVE_TEXTURE = $84E1;
  GL_MAX_TEXTURE_UNITS = $84E2;
  GL_TRANSPOSE_MODELVIEW_MATRIX = $84E3;
  GL_TRANSPOSE_PROJECTION_MATRIX = $84E4;
  GL_TRANSPOSE_TEXTURE_MATRIX = $84E5;
  GL_TRANSPOSE_COLOR_MATRIX = $84E6;
  GL_MULTISAMPLE = $809D;
  GL_SAMPLE_ALPHA_TO_COVERAGE = $809E;
  GL_SAMPLE_ALPHA_TO_ONE = $809F;
  GL_SAMPLE_COVERAGE = $80A0;
  GL_SAMPLE_BUFFERS = $80A8;
  GL_SAMPLES = $80A9;
  GL_SAMPLE_COVERAGE_VALUE = $80AA;
  GL_SAMPLE_COVERAGE_INVERT = $80AB;
  GL_MULTISAMPLE_BIT = $20000000;
  GL_NORMAL_MAP = $8511;
  GL_REFLECTION_MAP = $8512;
  GL_TEXTURE_CUBE_MAP = $8513;
  GL_TEXTURE_BINDING_CUBE_MAP = $8514;
  GL_TEXTURE_CUBE_MAP_POSITIVE_X = $8515;
  GL_TEXTURE_CUBE_MAP_NEGATIVE_X = $8516;
  GL_TEXTURE_CUBE_MAP_POSITIVE_Y = $8517;
  GL_TEXTURE_CUBE_MAP_NEGATIVE_Y = $8518;
  GL_TEXTURE_CUBE_MAP_POSITIVE_Z = $8519;
  GL_TEXTURE_CUBE_MAP_NEGATIVE_Z = $851A;
  GL_PROXY_TEXTURE_CUBE_MAP = $851B;
  GL_MAX_CUBE_MAP_TEXTURE_SIZE = $851C;
  GL_COMPRESSED_ALPHA = $84E9;
  GL_COMPRESSED_LUMINANCE = $84EA;
  GL_COMPRESSED_LUMINANCE_ALPHA = $84EB;
  GL_COMPRESSED_INTENSITY = $84EC;
  GL_COMPRESSED_RGB = $84ED;
  GL_COMPRESSED_RGBA = $84EE;
  GL_TEXTURE_COMPRESSION_HINT = $84EF;
  GL_TEXTURE_COMPRESSED_IMAGE_SIZE = $86A0;
  GL_TEXTURE_COMPRESSED = $86A1;
  GL_NUM_COMPRESSED_TEXTURE_FORMATS = $86A2;
  GL_COMPRESSED_TEXTURE_FORMATS = $86A3;
  GL_CLAMP_TO_BORDER = $812D;
  GL_CLAMP_TO_BORDER_SGIS = $812D;
  GL_COMBINE = $8570;
  GL_COMBINE_RGB = $8571;
  GL_COMBINE_ALPHA = $8572;
  GL_SOURCE0_RGB = $8580;
  GL_SOURCE1_RGB = $8581;
  GL_SOURCE2_RGB = $8582;
  GL_SOURCE0_ALPHA = $8588;
  GL_SOURCE1_ALPHA = $8589;
  GL_SOURCE2_ALPHA = $858A;
  GL_OPERAND0_RGB = $8590;
  GL_OPERAND1_RGB = $8591;
  GL_OPERAND2_RGB = $8592;
  GL_OPERAND0_ALPHA = $8598;
  GL_OPERAND1_ALPHA = $8599;
  GL_OPERAND2_ALPHA = $859A;
  GL_RGB_SCALE = $8573;
  GL_ADD_SIGNED = $8574;
  GL_INTERPOLATE = $8575;
  GL_SUBTRACT = $84E7;
  GL_CONSTANT = $8576;
  GL_PRIMARY_COLOR = $8577;
  GL_PREVIOUS = $8578;
  GL_DOT3_RGB = $86AE;
  GL_DOT3_RGBA = $86AF;
var
  glActiveTexture: procedure(texture: GLenum); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glClientActiveTexture: procedure(texture: GLenum); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glMultiTexCoord1d: procedure(target: GLenum; s: GLdouble); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glMultiTexCoord1dv: procedure(target: GLenum; const v: PGLdouble); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glMultiTexCoord1f: procedure(target: GLenum; s: GLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glMultiTexCoord1fv: procedure(target: GLenum; const v: PGLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glMultiTexCoord1i: procedure(target: GLenum; s: GLint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glMultiTexCoord1iv: procedure(target: GLenum; const v: PGLint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glMultiTexCoord1s: procedure(target: GLenum; s: GLshort); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glMultiTexCoord1sv: procedure(target: GLenum; const v: PGLshort); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glMultiTexCoord2d: procedure(target: GLenum; s: GLdouble; t: GLdouble); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glMultiTexCoord2dv: procedure(target: GLenum; const v: PGLdouble); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glMultiTexCoord2f: procedure(target: GLenum; s: GLfloat; t: GLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glMultiTexCoord2fv: procedure(target: GLenum; const v: PGLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glMultiTexCoord2i: procedure(target: GLenum; s: GLint; t: GLint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glMultiTexCoord2iv: procedure(target: GLenum; const v: PGLint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glMultiTexCoord2s: procedure(target: GLenum; s: GLshort; t: GLshort); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glMultiTexCoord2sv: procedure(target: GLenum; const v: PGLshort); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glMultiTexCoord3d: procedure(target: GLenum; s: GLdouble; t: GLdouble; r: GLdouble); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glMultiTexCoord3dv: procedure(target: GLenum; const v: PGLdouble); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glMultiTexCoord3f: procedure(target: GLenum; s: GLfloat; t: GLfloat; r: GLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glMultiTexCoord3fv: procedure(target: GLenum; const v: PGLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glMultiTexCoord3i: procedure(target: GLenum; s: GLint; t: GLint; r: GLint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glMultiTexCoord3iv: procedure(target: GLenum; const v: PGLint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glMultiTexCoord3s: procedure(target: GLenum; s: GLshort; t: GLshort; r: GLshort); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glMultiTexCoord3sv: procedure(target: GLenum; const v: PGLshort); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glMultiTexCoord4d: procedure(target: GLenum; s: GLdouble; t: GLdouble; r: GLdouble; q: GLdouble); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glMultiTexCoord4dv: procedure(target: GLenum; const v: PGLdouble); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glMultiTexCoord4f: procedure(target: GLenum; s: GLfloat; t: GLfloat; r: GLfloat; q: GLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glMultiTexCoord4fv: procedure(target: GLenum; const v: PGLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glMultiTexCoord4i: procedure(target: GLenum; s: GLint; t: GLint; r: GLint; q: GLint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glMultiTexCoord4iv: procedure(target: GLenum; const v: PGLint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glMultiTexCoord4s: procedure(target: GLenum; s: GLshort; t: GLshort; r: GLshort; q: GLshort); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glMultiTexCoord4sv: procedure(target: GLenum; const v: PGLshort); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glLoadTransposeMatrixf: procedure(const m: PGLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glLoadTransposeMatrixd: procedure(const m: PGLdouble); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glMultTransposeMatrixf: procedure(const m: PGLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glMultTransposeMatrixd: procedure(const m: PGLdouble); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glSampleCoverage: procedure(value: GLclampf; invert: GLboolean); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glCompressedTexImage3D: procedure(target: GLenum; level: GLint; internalformat: GLenum; width: GLsizei; height: GLsizei; depth: GLsizei; border: GLint; imageSize: GLsizei; const data: PGLvoid); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glCompressedTexImage2D: procedure(target: GLenum; level: GLint; internalformat: GLenum; width: GLsizei; height: GLsizei; border: GLint; imageSize: GLsizei; const data: PGLvoid); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glCompressedTexImage1D: procedure(target: GLenum; level: GLint; internalformat: GLenum; width: GLsizei; border: GLint; imageSize: GLsizei; const data: PGLvoid); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glCompressedTexSubImage3D: procedure(target: GLenum; level: GLint; xoffset: GLint; yoffset: GLint; zoffset: GLint; width: GLsizei; height: GLsizei; depth: GLsizei; format: GLenum; imageSize: GLsizei; const data: PGLvoid); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glCompressedTexSubImage2D: procedure(target: GLenum; level: GLint; xoffset: GLint; yoffset: GLint; width: GLsizei; height: GLsizei; format: GLenum; imageSize: GLsizei; const data: PGLvoid); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glCompressedTexSubImage1D: procedure(target: GLenum; level: GLint; xoffset: GLint; width: GLsizei; format: GLenum; imageSize: GLsizei; const data: PGLvoid); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glGetCompressedTexImage: procedure(target: GLenum; level: GLint; img: PGLvoid); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}

function Load_GL_version_1_3: Boolean;

//***** GL_ARB_multitexture *****//
const
  GL_TEXTURE0_ARB = $84C0;
  GL_TEXTURE1_ARB = $84C1;
  GL_TEXTURE2_ARB = $84C2;
  GL_TEXTURE3_ARB = $84C3;
  GL_TEXTURE4_ARB = $84C4;
  GL_TEXTURE5_ARB = $84C5;
  GL_TEXTURE6_ARB = $84C6;
  GL_TEXTURE7_ARB = $84C7;
  GL_TEXTURE8_ARB = $84C8;
  GL_TEXTURE9_ARB = $84C9;
  GL_TEXTURE10_ARB = $84CA;
  GL_TEXTURE11_ARB = $84CB;
  GL_TEXTURE12_ARB = $84CC;
  GL_TEXTURE13_ARB = $84CD;
  GL_TEXTURE14_ARB = $84CE;
  GL_TEXTURE15_ARB = $84CF;
  GL_TEXTURE16_ARB = $84D0;
  GL_TEXTURE17_ARB = $84D1;
  GL_TEXTURE18_ARB = $84D2;
  GL_TEXTURE19_ARB = $84D3;
  GL_TEXTURE20_ARB = $84D4;
  GL_TEXTURE21_ARB = $84D5;
  GL_TEXTURE22_ARB = $84D6;
  GL_TEXTURE23_ARB = $84D7;
  GL_TEXTURE24_ARB = $84D8;
  GL_TEXTURE25_ARB = $84D9;
  GL_TEXTURE26_ARB = $84DA;
  GL_TEXTURE27_ARB = $84DB;
  GL_TEXTURE28_ARB = $84DC;
  GL_TEXTURE29_ARB = $84DD;
  GL_TEXTURE30_ARB = $84DE;
  GL_TEXTURE31_ARB = $84DF;
  GL_ACTIVE_TEXTURE_ARB = $84E0;
  GL_CLIENT_ACTIVE_TEXTURE_ARB = $84E1;
  GL_MAX_TEXTURE_UNITS_ARB = $84E2;
var
  glActiveTextureARB: procedure(texture: GLenum); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glClientActiveTextureARB: procedure(texture: GLenum); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glMultiTexCoord1dARB: procedure(target: GLenum; s: GLdouble); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glMultiTexCoord1dvARB: procedure(target: GLenum; const v: PGLdouble); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glMultiTexCoord1fARB: procedure(target: GLenum; s: GLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glMultiTexCoord1fvARB: procedure(target: GLenum; const v: PGLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glMultiTexCoord1iARB: procedure(target: GLenum; s: GLint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glMultiTexCoord1ivARB: procedure(target: GLenum; const v: PGLint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glMultiTexCoord1sARB: procedure(target: GLenum; s: GLshort); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glMultiTexCoord1svARB: procedure(target: GLenum; const v: PGLshort); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glMultiTexCoord2dARB: procedure(target: GLenum; s: GLdouble; t: GLdouble); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glMultiTexCoord2dvARB: procedure(target: GLenum; const v: PGLdouble); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glMultiTexCoord2fARB: procedure(target: GLenum; s: GLfloat; t: GLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glMultiTexCoord2fvARB: procedure(target: GLenum; const v: PGLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glMultiTexCoord2iARB: procedure(target: GLenum; s: GLint; t: GLint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glMultiTexCoord2ivARB: procedure(target: GLenum; const v: PGLint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glMultiTexCoord2sARB: procedure(target: GLenum; s: GLshort; t: GLshort); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glMultiTexCoord2svARB: procedure(target: GLenum; const v: PGLshort); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glMultiTexCoord3dARB: procedure(target: GLenum; s: GLdouble; t: GLdouble; r: GLdouble); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glMultiTexCoord3dvARB: procedure(target: GLenum; const v: PGLdouble); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glMultiTexCoord3fARB: procedure(target: GLenum; s: GLfloat; t: GLfloat; r: GLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glMultiTexCoord3fvARB: procedure(target: GLenum; const v: PGLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glMultiTexCoord3iARB: procedure(target: GLenum; s: GLint; t: GLint; r: GLint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glMultiTexCoord3ivARB: procedure(target: GLenum; const v: PGLint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glMultiTexCoord3sARB: procedure(target: GLenum; s: GLshort; t: GLshort; r: GLshort); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glMultiTexCoord3svARB: procedure(target: GLenum; const v: PGLshort); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glMultiTexCoord4dARB: procedure(target: GLenum; s: GLdouble; t: GLdouble; r: GLdouble; q: GLdouble); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glMultiTexCoord4dvARB: procedure(target: GLenum; const v: PGLdouble); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glMultiTexCoord4fARB: procedure(target: GLenum; s: GLfloat; t: GLfloat; r: GLfloat; q: GLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glMultiTexCoord4fvARB: procedure(target: GLenum; const v: PGLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glMultiTexCoord4iARB: procedure(target: GLenum; s: GLint; t: GLint; r: GLint; q: GLint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glMultiTexCoord4ivARB: procedure(target: GLenum; const v: PGLint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glMultiTexCoord4sARB: procedure(target: GLenum; s: GLshort; t: GLshort; r: GLshort; q: GLshort); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glMultiTexCoord4svARB: procedure(target: GLenum; const v: PGLshort); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}

function Load_GL_ARB_multitexture: Boolean;

//***** GL_ARB_transpose_matrix *****//
const
  GL_TRANSPOSE_MODELVIEW_MATRIX_ARB = $84E3;
  GL_TRANSPOSE_PROJECTION_MATRIX_ARB = $84E4;
  GL_TRANSPOSE_TEXTURE_MATRIX_ARB = $84E5;
  GL_TRANSPOSE_COLOR_MATRIX_ARB = $84E6;
var
  glLoadTransposeMatrixfARB: procedure(m: PGLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glLoadTransposeMatrixdARB: procedure(m: PGLdouble); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glMultTransposeMatrixfARB: procedure(m: PGLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glMultTransposeMatrixdARB: procedure(m: PGLdouble); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}

function Load_GL_ARB_transpose_matrix: Boolean;

//***** GL_ARB_multisample *****//
const
  WGL_SAMPLE_BUFFERS_ARB = $2041;
  WGL_SAMPLES_ARB = $2042;
  GL_MULTISAMPLE_ARB = $809D;
  GL_SAMPLE_ALPHA_TO_COVERAGE_ARB = $809E;
  GL_SAMPLE_ALPHA_TO_ONE_ARB = $809F;
  GL_SAMPLE_COVERAGE_ARB = $80A0;
  GL_MULTISAMPLE_BIT_ARB = $20000000;
  GL_SAMPLE_BUFFERS_ARB = $80A8;
  GL_SAMPLES_ARB = $80A9;
  GL_SAMPLE_COVERAGE_VALUE_ARB = $80AA;
  GL_SAMPLE_COVERAGE_INVERT_ARB = $80AB;
var
  glSampleCoverageARB: procedure(value: GLclampf; invert: GLboolean); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}

function Load_GL_ARB_multisample: Boolean;

//***** GL_ARB_texture_env_add *****//

function Load_GL_ARB_texture_env_add: Boolean;

{$IFDEF WINDOWS}
//***** WGL_ARB_extensions_string *****//
var
  wglGetExtensionsStringARB: function(hdc: HDC): Pchar; {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}

function Load_WGL_ARB_extensions_string: Boolean;

//***** WGL_ARB_buffer_region *****//
const
  WGL_FRONT_COLOR_BUFFER_BIT_ARB = $0001;
  WGL_BACK_COLOR_BUFFER_BIT_ARB = $0002;
  WGL_DEPTH_BUFFER_BIT_ARB = $0004;
  WGL_STENCIL_BUFFER_BIT_ARB = $0008;
var
  wglCreateBufferRegionARB: function(hDC: HDC; iLayerPlane: GLint; uType: GLuint): THandle; {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  wglDeleteBufferRegionARB: procedure(hRegion: THandle); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  wglSaveBufferRegionARB: function(hRegion: THandle; x: GLint; y: GLint; width: GLint; height: GLint): BOOL; {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  wglRestoreBufferRegionARB: function(hRegion: THandle; x: GLint; y: GLint; width: GLint; height: GLint; xSrc: GLint; ySrc: GLint): BOOL; {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}

function Load_WGL_ARB_buffer_region: Boolean;
{$ENDIF}

//***** GL_ARB_texture_cube_map *****//
const
  GL_NORMAL_MAP_ARB = $8511;
  GL_REFLECTION_MAP_ARB = $8512;
  GL_TEXTURE_CUBE_MAP_ARB = $8513;
  GL_TEXTURE_BINDING_CUBE_MAP_ARB = $8514;
  GL_TEXTURE_CUBE_MAP_POSITIVE_X_ARB = $8515;
  GL_TEXTURE_CUBE_MAP_NEGATIVE_X_ARB = $8516;
  GL_TEXTURE_CUBE_MAP_POSITIVE_Y_ARB = $8517;
  GL_TEXTURE_CUBE_MAP_NEGATIVE_Y_ARB = $8518;
  GL_TEXTURE_CUBE_MAP_POSITIVE_Z_ARB = $8519;
  GL_TEXTURE_CUBE_MAP_NEGATIVE_Z_ARB = $851A;
  GL_PROXY_TEXTURE_CUBE_MAP_ARB = $851B;
  GL_MAX_CUBE_MAP_TEXTURE_SIZE_ARB = $851C;

function Load_GL_ARB_texture_cube_map: Boolean;

//***** GL_ARB_depth_texture *****//
const
  GL_DEPTH_COMPONENT16_ARB = $81A5;
  GL_DEPTH_COMPONENT24_ARB = $81A6;
  GL_DEPTH_COMPONENT32_ARB = $81A7;
  GL_TEXTURE_DEPTH_SIZE_ARB = $884A;
  GL_DEPTH_TEXTURE_MODE_ARB = $884B;

function Load_GL_ARB_depth_texture: Boolean;

//***** GL_ARB_point_parameters *****//
const
  GL_POINT_SIZE_MIN_ARB = $8126;
  GL_POINT_SIZE_MAX_ARB = $8127;
  GL_POINT_FADE_THRESHOLD_SIZE_ARB = $8128;
  GL_POINT_DISTANCE_ATTENUATION_ARB = $8129;
var
  glPointParameterfARB: procedure(pname: GLenum; param: GLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glPointParameterfvARB: procedure(pname: GLenum; params: PGLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}

function Load_GL_ARB_point_parameters: Boolean;

//***** GL_ARB_shadow *****//
const
  GL_TEXTURE_COMPARE_MODE_ARB = $884C;
  GL_TEXTURE_COMPARE_FUNC_ARB = $884D;
  GL_COMPARE_R_TO_TEXTURE_ARB = $884E;

function Load_GL_ARB_shadow: Boolean;

//***** GL_ARB_shadow_ambient *****//
const
  GL_TEXTURE_COMPARE_FAIL_VALUE_ARB = $80BF;

function Load_GL_ARB_shadow_ambient: Boolean;

//***** GL_ARB_texture_border_clamp *****//
const
  GL_CLAMP_TO_BORDER_ARB = $812D;

function Load_GL_ARB_texture_border_clamp: Boolean;

//***** GL_ARB_texture_compression *****//
const
  GL_COMPRESSED_ALPHA_ARB = $84E9;
  GL_COMPRESSED_LUMINANCE_ARB = $84EA;
  GL_COMPRESSED_LUMINANCE_ALPHA_ARB = $84EB;
  GL_COMPRESSED_INTENSITY_ARB = $84EC;
  GL_COMPRESSED_RGB_ARB = $84ED;
  GL_COMPRESSED_RGBA_ARB = $84EE;
  GL_TEXTURE_COMPRESSION_HINT_ARB = $84EF;
  GL_TEXTURE_COMPRESSED_IMAGE_SIZE_ARB = $86A0;
  GL_TEXTURE_COMPRESSED_ARB = $86A1;
  GL_NUM_COMPRESSED_TEXTURE_FORMATS_ARB = $86A2;
  GL_COMPRESSED_TEXTURE_FORMATS_ARB = $86A3;
var
  glCompressedTexImage3DARB: procedure(target: GLenum; level: GLint; internalformat: GLenum; width: GLsizei; height: GLsizei; depth: GLsizei; border: GLint; imageSize: GLsizei; const data: PGLvoid); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glCompressedTexImage2DARB: procedure(target: GLenum; level: GLint; internalformat: GLenum; width: GLsizei; height: GLsizei; border: GLint; imageSize: GLsizei; const data: PGLvoid); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glCompressedTexImage1DARB: procedure(target: GLenum; level: GLint; internalformat: GLenum; width: GLsizei; border: GLint; imageSize: GLsizei; const data: PGLvoid); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glCompressedTexSubImage3DARB: procedure(target: GLenum; level: GLint; xoffset: GLint; yoffset: GLint; zoffset: GLint; width: GLsizei; height: GLsizei; depth: GLsizei; format: GLenum; imageSize: GLsizei; const data: PGLvoid); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glCompressedTexSubImage2DARB: procedure(target: GLenum; level: GLint; xoffset: GLint; yoffset: GLint; width: GLsizei; height: GLsizei; format: GLenum; imageSize: GLsizei; const data: PGLvoid); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glCompressedTexSubImage1DARB: procedure(target: GLenum; level: GLint; xoffset: GLint; width: GLsizei; format: GLenum; imageSize: GLsizei; const data: PGLvoid); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glGetCompressedTexImageARB: procedure(target: GLenum; lod: GLint; img: PGLvoid); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}

function Load_GL_ARB_texture_compression: Boolean;

//***** GL_ARB_texture_env_combine *****//
const
  GL_COMBINE_ARB = $8570;
  GL_COMBINE_RGB_ARB = $8571;
  GL_COMBINE_ALPHA_ARB = $8572;
  GL_SOURCE0_RGB_ARB = $8580;
  GL_SOURCE1_RGB_ARB = $8581;
  GL_SOURCE2_RGB_ARB = $8582;
  GL_SOURCE0_ALPHA_ARB = $8588;
  GL_SOURCE1_ALPHA_ARB = $8589;
  GL_SOURCE2_ALPHA_ARB = $858A;
  GL_OPERAND0_RGB_ARB = $8590;
  GL_OPERAND1_RGB_ARB = $8591;
  GL_OPERAND2_RGB_ARB = $8592;
  GL_OPERAND0_ALPHA_ARB = $8598;
  GL_OPERAND1_ALPHA_ARB = $8599;
  GL_OPERAND2_ALPHA_ARB = $859A;
  GL_RGB_SCALE_ARB = $8573;
  GL_ADD_SIGNED_ARB = $8574;
  GL_INTERPOLATE_ARB = $8575;
  GL_SUBTRACT_ARB = $84E7;
  GL_CONSTANT_ARB = $8576;
  GL_PRIMARY_COLOR_ARB = $8577;
  GL_PREVIOUS_ARB = $8578;

function Load_GL_ARB_texture_env_combine: Boolean;

//***** GL_ARB_texture_env_crossbar *****//

function Load_GL_ARB_texture_env_crossbar: Boolean;

//***** GL_ARB_texture_env_dot3 *****//
const
  GL_DOT3_RGB_ARB = $86AE;
  GL_DOT3_RGBA_ARB = $86AF;

function Load_GL_ARB_texture_env_dot3: Boolean;

//***** GL_ARB_texture_mirrored_repeat *****//
const
  GL_MIRRORED_REPEAT_ARB = $8370;

function Load_GL_ARB_texture_mirrored_repeat: Boolean;

//***** GL_ARB_vertex_blend *****//
const
  GL_MAX_VERTEX_UNITS_ARB = $86A4;
  GL_ACTIVE_VERTEX_UNITS_ARB = $86A5;
  GL_WEIGHT_SUM_UNITY_ARB = $86A6;
  GL_VERTEX_BLEND_ARB = $86A7;
  GL_MODELVIEW0_ARB = $1700;
  GL_MODELVIEW1_ARB = $850A;
  GL_MODELVIEW2_ARB = $8722;
  GL_MODELVIEW3_ARB = $8723;
  GL_MODELVIEW4_ARB = $8724;
  GL_MODELVIEW5_ARB = $8725;
  GL_MODELVIEW6_ARB = $8726;
  GL_MODELVIEW7_ARB = $8727;
  GL_MODELVIEW8_ARB = $8728;
  GL_MODELVIEW9_ARB = $8729;
  GL_MODELVIEW10_ARB = $872A;
  GL_MODELVIEW11_ARB = $872B;
  GL_MODELVIEW12_ARB = $872C;
  GL_MODELVIEW13_ARB = $872D;
  GL_MODELVIEW14_ARB = $872E;
  GL_MODELVIEW15_ARB = $872F;
  GL_MODELVIEW16_ARB = $8730;
  GL_MODELVIEW17_ARB = $8731;
  GL_MODELVIEW18_ARB = $8732;
  GL_MODELVIEW19_ARB = $8733;
  GL_MODELVIEW20_ARB = $8734;
  GL_MODELVIEW21_ARB = $8735;
  GL_MODELVIEW22_ARB = $8736;
  GL_MODELVIEW23_ARB = $8737;
  GL_MODELVIEW24_ARB = $8738;
  GL_MODELVIEW25_ARB = $8739;
  GL_MODELVIEW26_ARB = $873A;
  GL_MODELVIEW27_ARB = $873B;
  GL_MODELVIEW28_ARB = $873C;
  GL_MODELVIEW29_ARB = $873D;
  GL_MODELVIEW30_ARB = $873E;
  GL_MODELVIEW31_ARB = $873F;
  GL_CURRENT_WEIGHT_ARB = $86A8;
  GL_WEIGHT_ARRAY_TYPE_ARB = $86A9;
  GL_WEIGHT_ARRAY_STRIDE_ARB = $86AA;
  GL_WEIGHT_ARRAY_SIZE_ARB = $86AB;
  GL_WEIGHT_ARRAY_POINTER_ARB = $86AC;
  GL_WEIGHT_ARRAY_ARB = $86AD;
var
  glWeightbvARB: procedure(size: GLint; weights: PGLbyte); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glWeightsvARB: procedure(size: GLint; weights: PGLshort); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glWeightivARB: procedure(size: GLint; weights: PGLint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glWeightfvARB: procedure(size: GLint; weights: PGLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glWeightdvARB: procedure(size: GLint; weights: PGLdouble); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glWeightvARB: procedure(size: GLint; weights: PGLdouble); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glWeightubvARB: procedure(size: GLint; weights: PGLubyte); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glWeightusvARB: procedure(size: GLint; weights: PGLushort); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glWeightuivARB: procedure(size: GLint; weights: PGLuint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glWeightPointerARB: procedure(size: GLint; _type: GLenum; stride: GLsizei; pointer: PGLvoid); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glVertexBlendARB: procedure(count: GLint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}

function Load_GL_ARB_vertex_blend: Boolean;

//***** GL_ARB_vertex_program *****//
const
  GL_VERTEX_PROGRAM_ARB = $8620;
  GL_VERTEX_PROGRAM_POINT_SIZE_ARB = $8642;
  GL_VERTEX_PROGRAM_TWO_SIDE_ARB = $8643;
  GL_COLOR_SUM_ARB = $8458;
  GL_PROGRAM_FORMAT_ASCII_ARB = $8875;
  GL_VERTEX_ATTRIB_ARRAY_ENABLED_ARB = $8622;
  GL_VERTEX_ATTRIB_ARRAY_SIZE_ARB = $8623;
  GL_VERTEX_ATTRIB_ARRAY_STRIDE_ARB = $8624;
  GL_VERTEX_ATTRIB_ARRAY_TYPE_ARB = $8625;
  GL_VERTEX_ATTRIB_ARRAY_NORMALIZED_ARB = $886A;
  GL_CURRENT_VERTEX_ATTRIB_ARB = $8626;
  GL_VERTEX_ATTRIB_ARRAY_POINTER_ARB = $8645;
  GL_PROGRAM_LENGTH_ARB = $8627;
  GL_PROGRAM_FORMAT_ARB = $8876;
  GL_PROGRAM_BINDING_ARB = $8677;
  GL_PROGRAM_INSTRUCTIONS_ARB = $88A0;
  GL_MAX_PROGRAM_INSTRUCTIONS_ARB = $88A1;
  GL_PROGRAM_NATIVE_INSTRUCTIONS_ARB = $88A2;
  GL_MAX_PROGRAM_NATIVE_INSTRUCTIONS_ARB = $88A3;
  GL_PROGRAM_TEMPORARIES_ARB = $88A4;
  GL_MAX_PROGRAM_TEMPORARIES_ARB = $88A5;
  GL_PROGRAM_NATIVE_TEMPORARIES_ARB = $88A6;
  GL_MAX_PROGRAM_NATIVE_TEMPORARIES_ARB = $88A7;
  GL_PROGRAM_PARAMETERS_ARB = $88A8;
  GL_MAX_PROGRAM_PARAMETERS_ARB = $88A9;
  GL_PROGRAM_NATIVE_PARAMETERS_ARB = $88AA;
  GL_MAX_PROGRAM_NATIVE_PARAMETERS_ARB = $88AB;
  GL_PROGRAM_ATTRIBS_ARB = $88AC;
  GL_MAX_PROGRAM_ATTRIBS_ARB = $88AD;
  GL_PROGRAM_NATIVE_ATTRIBS_ARB = $88AE;
  GL_MAX_PROGRAM_NATIVE_ATTRIBS_ARB = $88AF;
  GL_PROGRAM_ADDRESS_REGISTERS_ARB = $88B0;
  GL_MAX_PROGRAM_ADDRESS_REGISTERS_ARB = $88B1;
  GL_PROGRAM_NATIVE_ADDRESS_REGISTERS_ARB = $88B2;
  GL_MAX_PROGRAM_NATIVE_ADDRESS_REGISTERS_ARB = $88B3;
  GL_MAX_PROGRAM_LOCAL_PARAMETERS_ARB = $88B4;
  GL_MAX_PROGRAM_ENV_PARAMETERS_ARB = $88B5;
  GL_PROGRAM_UNDER_NATIVE_LIMITS_ARB = $88B6;
  GL_PROGRAM_STRING_ARB = $8628;
  GL_PROGRAM_ERROR_POSITION_ARB = $864B;
  GL_CURRENT_MATRIX_ARB = $8641;
  GL_TRANSPOSE_CURRENT_MATRIX_ARB = $88B7;
  GL_CURRENT_MATRIX_STACK_DEPTH_ARB = $8640;
  GL_MAX_VERTEX_ATTRIBS_ARB = $8869;
  GL_MAX_PROGRAM_MATRICES_ARB = $862F;
  GL_MAX_PROGRAM_MATRIX_STACK_DEPTH_ARB = $862E;
  GL_PROGRAM_ERROR_STRING_ARB = $8874;
  GL_MATRIX0_ARB = $88C0;
  GL_MATRIX1_ARB = $88C1;
  GL_MATRIX2_ARB = $88C2;
  GL_MATRIX3_ARB = $88C3;
  GL_MATRIX4_ARB = $88C4;
  GL_MATRIX5_ARB = $88C5;
  GL_MATRIX6_ARB = $88C6;
  GL_MATRIX7_ARB = $88C7;
  GL_MATRIX8_ARB = $88C8;
  GL_MATRIX9_ARB = $88C9;
  GL_MATRIX10_ARB = $88CA;
  GL_MATRIX11_ARB = $88CB;
  GL_MATRIX12_ARB = $88CC;
  GL_MATRIX13_ARB = $88CD;
  GL_MATRIX14_ARB = $88CE;
  GL_MATRIX15_ARB = $88CF;
  GL_MATRIX16_ARB = $88D0;
  GL_MATRIX17_ARB = $88D1;
  GL_MATRIX18_ARB = $88D2;
  GL_MATRIX19_ARB = $88D3;
  GL_MATRIX20_ARB = $88D4;
  GL_MATRIX21_ARB = $88D5;
  GL_MATRIX22_ARB = $88D6;
  GL_MATRIX23_ARB = $88D7;
  GL_MATRIX24_ARB = $88D8;
  GL_MATRIX25_ARB = $88D9;
  GL_MATRIX26_ARB = $88DA;
  GL_MATRIX27_ARB = $88DB;
  GL_MATRIX28_ARB = $88DC;
  GL_MATRIX29_ARB = $88DD;
  GL_MATRIX30_ARB = $88DE;
  GL_MATRIX31_ARB = $88DF;
var
  glVertexAttrib1sARB: procedure(index: GLuint; x: GLshort); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glVertexAttrib1fARB: procedure(index: GLuint; x: GLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glVertexAttrib1dARB: procedure(index: GLuint; x: GLdouble); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glVertexAttrib2sARB: procedure(index: GLuint; x: GLshort; y: GLshort); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glVertexAttrib2fARB: procedure(index: GLuint; x: GLfloat; y: GLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glVertexAttrib2dARB: procedure(index: GLuint; x: GLdouble; y: GLdouble); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glVertexAttrib3sARB: procedure(index: GLuint; x: GLshort; y: GLshort; z: GLshort); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glVertexAttrib3fARB: procedure(index: GLuint; x: GLfloat; y: GLfloat; z: GLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glVertexAttrib3dARB: procedure(index: GLuint; x: GLdouble; y: GLdouble; z: GLdouble); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glVertexAttrib4sARB: procedure(index: GLuint; x: GLshort; y: GLshort; z: GLshort; w: GLshort); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glVertexAttrib4fARB: procedure(index: GLuint; x: GLfloat; y: GLfloat; z: GLfloat; w: GLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glVertexAttrib4dARB: procedure(index: GLuint; x: GLdouble; y: GLdouble; z: GLdouble; w: GLdouble); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glVertexAttrib4NubARB: procedure(index: GLuint; x: GLubyte; y: GLubyte; z: GLubyte; w: GLubyte); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glVertexAttrib1svARB: procedure(index: GLuint; const v: PGLshort); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glVertexAttrib1fvARB: procedure(index: GLuint; const v: PGLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glVertexAttrib1dvARB: procedure(index: GLuint; const v: PGLdouble); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glVertexAttrib2svARB: procedure(index: GLuint; const v: PGLshort); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glVertexAttrib2fvARB: procedure(index: GLuint; const v: PGLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glVertexAttrib2dvARB: procedure(index: GLuint; const v: PGLdouble); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glVertexAttrib3svARB: procedure(index: GLuint; const v: PGLshort); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glVertexAttrib3fvARB: procedure(index: GLuint; const v: PGLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glVertexAttrib3dvARB: procedure(index: GLuint; const v: PGLdouble); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glVertexAttrib4bvARB: procedure(index: GLuint; const v: PGLbyte); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glVertexAttrib4svARB: procedure(index: GLuint; const v: PGLshort); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glVertexAttrib4ivARB: procedure(index: GLuint; const v: PGLint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glVertexAttrib4ubvARB: procedure(index: GLuint; const v: PGLubyte); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glVertexAttrib4usvARB: procedure(index: GLuint; const v: PGLushort); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glVertexAttrib4uivARB: procedure(index: GLuint; const v: PGLuint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glVertexAttrib4fvARB: procedure(index: GLuint; const v: PGLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glVertexAttrib4dvARB: procedure(index: GLuint; const v: PGLdouble); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glVertexAttrib4NbvARB: procedure(index: GLuint; const v: PGLbyte); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glVertexAttrib4NsvARB: procedure(index: GLuint; const v: PGLshort); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glVertexAttrib4NivARB: procedure(index: GLuint; const v: PGLint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glVertexAttrib4NubvARB: procedure(index: GLuint; const v: PGLubyte); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glVertexAttrib4NusvARB: procedure(index: GLuint; const v: PGLushort); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glVertexAttrib4NuivARB: procedure(index: GLuint; const v: PGLuint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glVertexAttribPointerARB: procedure(index: GLuint; size: GLint; _type: GLenum; normalized: GLboolean; stride: GLsizei; const pointer: PGLvoid); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glEnableVertexAttribArrayARB: procedure(index: GLuint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glDisableVertexAttribArrayARB: procedure(index: GLuint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glProgramStringARB: procedure(target: GLenum; format: GLenum; len: GLsizei; const _string: PGLvoid); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glBindProgramARB: procedure(target: GLenum; _program: GLuint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glDeleteProgramsARB: procedure(n: GLsizei; const programs: PGLuint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glGenProgramsARB: procedure(n: GLsizei; programs: PGLuint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glProgramEnvParameter4dARB: procedure(target: GLenum; index: GLuint; x: GLdouble; y: GLdouble; z: GLdouble; w: GLdouble); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glProgramEnvParameter4dvARB: procedure(target: GLenum; index: GLuint; const params: PGLdouble); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glProgramEnvParameter4fARB: procedure(target: GLenum; index: GLuint; x: GLfloat; y: GLfloat; z: GLfloat; w: GLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glProgramEnvParameter4fvARB: procedure(target: GLenum; index: GLuint; const params: PGLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glProgramLocalParameter4dARB: procedure(target: GLenum; index: GLuint; x: GLdouble; y: GLdouble; z: GLdouble; w: GLdouble); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glProgramLocalParameter4dvARB: procedure(target: GLenum; index: GLuint; const params: PGLdouble); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glProgramLocalParameter4fARB: procedure(target: GLenum; index: GLuint; x: GLfloat; y: GLfloat; z: GLfloat; w: GLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glProgramLocalParameter4fvARB: procedure(target: GLenum; index: GLuint; const params: PGLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glGetProgramEnvParameterdvARB: procedure(target: GLenum; index: GLuint; params: PGLdouble); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glGetProgramEnvParameterfvARB: procedure(target: GLenum; index: GLuint; params: PGLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glGetProgramLocalParameterdvARB: procedure(target: GLenum; index: GLuint; params: PGLdouble); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glGetProgramLocalParameterfvARB: procedure(target: GLenum; index: GLuint; params: PGLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glGetProgramivARB: procedure(target: GLenum; pname: GLenum; params: PGLint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glGetProgramStringARB: procedure(target: GLenum; pname: GLenum; _string: PGLvoid); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glGetVertexAttribdvARB: procedure(index: GLuint; pname: GLenum; params: PGLdouble); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glGetVertexAttribfvARB: procedure(index: GLuint; pname: GLenum; params: PGLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glGetVertexAttribivARB: procedure(index: GLuint; pname: GLenum; params: PGLint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glGetVertexAttribPointervARB: procedure(index: GLuint; pname: GLenum; pointer: PGLvoid); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glIsProgramARB: function(_program: GLuint): GLboolean; {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}

function Load_GL_ARB_vertex_program: Boolean;

//***** GL_ARB_window_pos *****//
var
  glWindowPos2dARB: procedure(x: GLdouble; y: GLdouble); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glWindowPos2fARB: procedure(x: GLfloat; y: GLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glWindowPos2iARB: procedure(x: GLint; y: GLint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glWindowPos2sARB: procedure(x: GLshort; y: GLshort); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glWindowPos2dvARB: procedure(const p: PGLdouble); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glWindowPos2fvARB: procedure(const p: PGLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glWindowPos2ivARB: procedure(const p: PGLint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glWindowPos2svARB: procedure(const p: PGLshort); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glWindowPos3dARB: procedure(x: GLdouble; y: GLdouble; z: GLdouble); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glWindowPos3fARB: procedure(x: GLfloat; y: GLfloat; z: GLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glWindowPos3iARB: procedure(x: GLint; y: GLint; z: GLint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glWindowPos3sARB: procedure(x: GLshort; y: GLshort; z: GLshort); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glWindowPos3dvARB: procedure(const p: PGLdouble); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glWindowPos3fvARB: procedure(const p: PGLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glWindowPos3ivARB: procedure(const p: PGLint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glWindowPos3svARB: procedure(const p: PGLshort); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}

function Load_GL_ARB_window_pos: Boolean;

//***** GL_EXT_422_pixels *****//
const
  GL_422_EXT = $80CC;
  GL_422_REV_EXT = $80CD;
  GL_422_AVERAGE_EXT = $80CE;
  GL_422_REV_AVERAGE_EXT = $80CF;

function Load_GL_EXT_422_pixels: Boolean;

//***** GL_EXT_abgr *****//
const
  GL_ABGR_EXT = $8000;

function Load_GL_EXT_abgr: Boolean;

//***** GL_EXT_bgra *****//
const
  GL_BGR_EXT = $80E0;
  GL_BGRA_EXT = $80E1;

function Load_GL_EXT_bgra: Boolean;

//***** GL_EXT_blend_color *****//
const
  GL_CONSTANT_COLOR_EXT = $8001;
  GL_ONE_MINUS_CONSTANT_COLOR_EXT = $8002;
  GL_CONSTANT_ALPHA_EXT = $8003;
  GL_ONE_MINUS_CONSTANT_ALPHA_EXT = $8004;
  GL_BLEND_COLOR_EXT = $8005;
var
  glBlendColorEXT: procedure(red: GLclampf; green: GLclampf; blue: GLclampf; alpha: GLclampf); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}

function Load_GL_EXT_blend_color: Boolean;

//***** GL_EXT_blend_func_separate *****//
const
  GL_BLEND_DST_RGB_EXT = $80C8;
  GL_BLEND_SRC_RGB_EXT = $80C9;
  GL_BLEND_DST_ALPHA_EXT = $80CA;
  GL_BLEND_SRC_ALPHA_EXT = $80CB;
var
  glBlendFuncSeparateEXT: procedure(sfactorRGB: GLenum; dfactorRGB: GLenum; sfactorAlpha: GLenum; dfactorAlpha: GLenum); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}

function Load_GL_EXT_blend_func_separate: Boolean;

//***** GL_EXT_blend_logic_op *****//

function Load_GL_EXT_blend_logic_op: Boolean;

//***** GL_EXT_blend_minmax *****//
const
  GL_FUNC_ADD_EXT = $8006;
  GL_MIN_EXT = $8007;
  GL_MAX_EXT = $8008;
  GL_BLEND_EQUATION_EXT = $8009;
var
  glBlendEquationEXT: procedure(mode: GLenum); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}

function Load_GL_EXT_blend_minmax: Boolean;

//***** GL_EXT_blend_subtract *****//
const
  GL_FUNC_SUBTRACT_EXT = $800A;
  GL_FUNC_REVERSE_SUBTRACT_EXT = $800B;

function Load_GL_EXT_blend_subtract: Boolean;

//***** GL_EXT_clip_volume_hint *****//
const
  GL_CLIP_VOLUME_CLIPPING_HINT_EXT = $80F0;

function Load_GL_EXT_clip_volume_hint: Boolean;

//***** GL_EXT_color_subtable *****//
var
  glColorSubTableEXT: procedure(target: GLenum; start: GLsizei; count: GLsizei; format: GLenum; _type: GLenum; const data: PGLvoid); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glCopyColorSubTableEXT: procedure(target: GLenum; start: GLsizei; x: GLint; y: GLint; width: GLsizei); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}

function Load_GL_EXT_color_subtable: Boolean;

//***** GL_EXT_compiled_vertex_array *****//
const
  GL_ARRAY_ELEMENT_LOCK_FIRST_EXT = $81A8;
  GL_ARRAY_ELEMENT_LOCK_COUNT_EXT = $81A9;
var
  glLockArraysEXT: procedure(first: GLint; count: GLsizei); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glUnlockArraysEXT: procedure(); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}

function Load_GL_EXT_compiled_vertex_array: Boolean;

//***** GL_EXT_convolution *****//
const
  GL_CONVOLUTION_1D_EXT = $8010;
  GL_CONVOLUTION_2D_EXT = $8011;
  GL_SEPARABLE_2D_EXT = $8012;
  GL_CONVOLUTION_BORDER_MODE_EXT = $8013;
  GL_CONVOLUTION_FILTER_SCALE_EXT = $8014;
  GL_CONVOLUTION_FILTER_BIAS_EXT = $8015;
  GL_REDUCE_EXT = $8016;
  GL_CONVOLUTION_FORMAT_EXT = $8017;
  GL_CONVOLUTION_WIDTH_EXT = $8018;
  GL_CONVOLUTION_HEIGHT_EXT = $8019;
  GL_MAX_CONVOLUTION_WIDTH_EXT = $801A;
  GL_MAX_CONVOLUTION_HEIGHT_EXT = $801B;
  GL_POST_CONVOLUTION_RED_SCALE_EXT = $801C;
  GL_POST_CONVOLUTION_GREEN_SCALE_EXT = $801D;
  GL_POST_CONVOLUTION_BLUE_SCALE_EXT = $801E;
  GL_POST_CONVOLUTION_ALPHA_SCALE_EXT = $801F;
  GL_POST_CONVOLUTION_RED_BIAS_EXT = $8020;
  GL_POST_CONVOLUTION_GREEN_BIAS_EXT = $8021;
  GL_POST_CONVOLUTION_BLUE_BIAS_EXT = $8022;
  GL_POST_CONVOLUTION_ALPHA_BIAS_EXT = $8023;
var
  glConvolutionFilter1DEXT: procedure(target: GLenum; internalformat: GLenum; width: GLsizei; format: GLenum; _type: GLenum; const image: PGLvoid); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glConvolutionFilter2DEXT: procedure(target: GLenum; internalformat: GLenum; width: GLsizei; height: GLsizei; format: GLenum; _type: GLenum; const image: PGLvoid); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glCopyConvolutionFilter1DEXT: procedure(target: GLenum; internalformat: GLenum; x: GLint; y: GLint; width: GLsizei); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glCopyConvolutionFilter2DEXT: procedure(target: GLenum; internalformat: GLenum; x: GLint; y: GLint; width: GLsizei; height: GLsizei); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glGetConvolutionFilterEXT: procedure(target: GLenum; format: GLenum; _type: GLenum; image: PGLvoid); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glSeparableFilter2DEXT: procedure(target: GLenum; internalformat: GLenum; width: GLsizei; height: GLsizei; format: GLenum; _type: GLenum; const row: PGLvoid; const column: PGLvoid); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glGetSeparableFilterEXT: procedure(target: GLenum; format: GLenum; _type: GLenum; row: PGLvoid; column: PGLvoid; span: PGLvoid); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glConvolutionParameteriEXT: procedure(target: GLenum; pname: GLenum; param: GLint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glConvolutionParameterivEXT: procedure(target: GLenum; pname: GLenum; const params: PGLint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glConvolutionParameterfEXT: procedure(target: GLenum; pname: GLenum; param: GLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glConvolutionParameterfvEXT: procedure(target: GLenum; pname: GLenum; const params: PGLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glGetConvolutionParameterivEXT: procedure(target: GLenum; pname: GLenum; params: PGLint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glGetConvolutionParameterfvEXT: procedure(target: GLenum; pname: GLenum; params: PGLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}

function Load_GL_EXT_convolution: Boolean;

//***** GL_EXT_histogram *****//
const
  GL_HISTOGRAM_EXT = $8024;
  GL_PROXY_HISTOGRAM_EXT = $8025;
  GL_HISTOGRAM_WIDTH_EXT = $8026;
  GL_HISTOGRAM_FORMAT_EXT = $8027;
  GL_HISTOGRAM_RED_SIZE_EXT = $8028;
  GL_HISTOGRAM_GREEN_SIZE_EXT = $8029;
  GL_HISTOGRAM_BLUE_SIZE_EXT = $802A;
  GL_HISTOGRAM_ALPHA_SIZE_EXT = $802B;
  GL_HISTOGRAM_LUMINANCE_SIZE_EXT = $802C;
  GL_HISTOGRAM_SINK_EXT = $802D;
  GL_MINMAX_EXT = $802E;
  GL_MINMAX_FORMAT_EXT = $802F;
  GL_MINMAX_SINK_EXT = $8030;
var
  glHistogramEXT: procedure(target: GLenum; width: GLsizei; internalformat: GLenum; sink: GLboolean); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glResetHistogramEXT: procedure(target: GLenum); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glGetHistogramEXT: procedure(target: GLenum; reset: GLboolean; format: GLenum; _type: GLenum; values: PGLvoid); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glGetHistogramParameterivEXT: procedure(target: GLenum; pname: GLenum; params: PGLint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glGetHistogramParameterfvEXT: procedure(target: GLenum; pname: GLenum; params: PGLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glMinmaxEXT: procedure(target: GLenum; internalformat: GLenum; sink: GLboolean); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glResetMinmaxEXT: procedure(target: GLenum); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glGetMinmaxEXT: procedure(target: GLenum; reset: GLboolean; format: GLenum; _type: GLenum; values: PGLvoid); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glGetMinmaxParameterivEXT: procedure(target: GLenum; pname: GLenum; params: PGLint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glGetMinmaxParameterfvEXT: procedure(target: GLenum; pname: GLenum; params: PGLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}

function Load_GL_EXT_histogram: Boolean;

//***** GL_EXT_multi_draw_arrays *****//
var
  glMultiDrawArraysEXT: procedure(mode: GLenum; first: PGLint; count: PGLsizei; primcount: GLsizei); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glMultiDrawElementsEXT: procedure(mode: GLenum; count: PGLsizei; _type: GLenum; const indices: PGLvoid; primcount: GLsizei); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}

function Load_GL_EXT_multi_draw_arrays: Boolean;

//***** GL_EXT_packed_pixels *****//
const
  GL_UNSIGNED_BYTE_3_3_2_EXT = $8032;
  GL_UNSIGNED_SHORT_4_4_4_4_EXT = $8033;
  GL_UNSIGNED_SHORT_5_5_5_1_EXT = $8034;
  GL_UNSIGNED_INT_8_8_8_8_EXT = $8035;
  GL_UNSIGNED_INT_10_10_10_2_EXT = $8036;

function Load_GL_EXT_packed_pixels: Boolean;

//***** GL_EXT_paletted_texture *****//
const
  GL_COLOR_INDEX1_EXT = $80E2;
  GL_COLOR_INDEX2_EXT = $80E3;
  GL_COLOR_INDEX4_EXT = $80E4;
  GL_COLOR_INDEX8_EXT = $80E5;
  GL_COLOR_INDEX12_EXT = $80E6;
  GL_COLOR_INDEX16_EXT = $80E7;
  GL_COLOR_TABLE_FORMAT_EXT = $80D8;
  GL_COLOR_TABLE_WIDTH_EXT = $80D9;
  GL_COLOR_TABLE_RED_SIZE_EXT = $80DA;
  GL_COLOR_TABLE_GREEN_SIZE_EXT = $80DB;
  GL_COLOR_TABLE_BLUE_SIZE_EXT = $80DC;
  GL_COLOR_TABLE_ALPHA_SIZE_EXT = $80DD;
  GL_COLOR_TABLE_LUMINANCE_SIZE_EXT = $80DE;
  GL_COLOR_TABLE_INTENSITY_SIZE_EXT = $80DF;
  GL_TEXTURE_INDEX_SIZE_EXT = $80ED;
  GL_TEXTURE_1D = $0DE0;
  GL_TEXTURE_2D = $0DE1;
  GL_TEXTURE_3D_EXT = $806F;
  // GL_TEXTURE_CUBE_MAP_ARB  { already defined }
  GL_PROXY_TEXTURE_1D = $8063;
  GL_PROXY_TEXTURE_2D = $8064;
  GL_PROXY_TEXTURE_3D_EXT = $8070;
  // GL_PROXY_TEXTURE_CUBE_MAP_ARB  { already defined }
  // GL_TEXTURE_1D  { already defined }
  // GL_TEXTURE_2D  { already defined }
  // GL_TEXTURE_3D_EXT  { already defined }
  // GL_TEXTURE_CUBE_MAP_ARB  { already defined }
var
  glColorTableEXT: procedure(target: GLenum; internalFormat: GLenum; width: GLsizei; format: GLenum; _type: GLenum; const data: PGLvoid); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  // glColorSubTableEXT  { already defined }
  glGetColorTableEXT: procedure(target: GLenum; format: GLenum; _type: GLenum; data: PGLvoid); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glGetColorTableParameterivEXT: procedure(target: GLenum; pname: GLenum; params: PGLint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glGetColorTableParameterfvEXT: procedure(target: GLenum; pname: GLenum; params: PGLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}

function Load_GL_EXT_paletted_texture: Boolean;

//***** GL_EXT_point_parameters *****//
const
  GL_POINT_SIZE_MIN_EXT = $8126;
  GL_POINT_SIZE_MAX_EXT = $8127;
  GL_POINT_FADE_THRESHOLD_SIZE_EXT = $8128;
  GL_DISTANCE_ATTENUATION_EXT = $8129;
var
  glPointParameterfEXT: procedure(pname: GLenum; param: GLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glPointParameterfvEXT: procedure(pname: GLenum; params: PGLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}

function Load_GL_EXT_point_parameters: Boolean;

//***** GL_EXT_polygon_offset *****//
const
  GL_POLYGON_OFFSET_EXT = $8037;
  GL_POLYGON_OFFSET_FACTOR_EXT = $8038;
  GL_POLYGON_OFFSET_BIAS_EXT = $8039;
var
  glPolygonOffsetEXT: procedure(factor: GLfloat; bias: GLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}

function Load_GL_EXT_polygon_offset: Boolean;

//***** GL_EXT_separate_specular_color *****//
const
  GL_LIGHT_MODEL_COLOR_CONTROL_EXT = $81F8;
  GL_SINGLE_COLOR_EXT = $81F9;
  GL_SEPARATE_SPECULAR_COLOR_EXT = $81FA;

function Load_GL_EXT_separate_specular_color: Boolean;

//***** GL_EXT_shadow_funcs *****//

function Load_GL_EXT_shadow_funcs: Boolean;

//***** GL_EXT_shared_texture_palette *****//
const
  GL_SHARED_TEXTURE_PALETTE_EXT = $81FB;

function Load_GL_EXT_shared_texture_palette: Boolean;

//***** GL_EXT_stencil_two_side *****//
const
  GL_STENCIL_TEST_TWO_SIDE_EXT = $8910;
  GL_ACTIVE_STENCIL_FACE_EXT = $8911;
var
  glActiveStencilFaceEXT: procedure(face: GLenum); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}

function Load_GL_EXT_stencil_two_side: Boolean;

//***** GL_EXT_stencil_wrap *****//
const
  GL_INCR_WRAP_EXT = $8507;
  GL_DECR_WRAP_EXT = $8508;

function Load_GL_EXT_stencil_wrap: Boolean;

//***** GL_EXT_subtexture *****//
var
  glTexSubImage1DEXT: procedure(target: GLenum; level: GLint; xoffset: GLint; width: GLsizei; format: GLenum; _type: GLenum; const pixels: PGLvoid); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glTexSubImage2DEXT: procedure(target: GLenum; level: GLint; xoffset: GLint; yoffset: GLint; width: GLsizei; height: GLsizei; format: GLenum; _type: GLenum; const pixels: PGLvoid); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glTexSubImage3DEXT: procedure(target: GLenum; level: GLint; xoffset: GLint; yoffset: GLint; zoffset: GLint; width: GLsizei; height: GLsizei; depth: GLsizei; format: GLenum; _type: GLenum; const pixels: PGLvoid); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}

function Load_GL_EXT_subtexture: Boolean;

//***** GL_EXT_texture3D *****//
const
  GL_PACK_SKIP_IMAGES_EXT = $806B;
  GL_PACK_IMAGE_HEIGHT_EXT = $806C;
  GL_UNPACK_SKIP_IMAGES_EXT = $806D;
  GL_UNPACK_IMAGE_HEIGHT_EXT = $806E;
  // GL_TEXTURE_3D_EXT  { already defined }
  // GL_PROXY_TEXTURE_3D_EXT  { already defined }
  GL_TEXTURE_DEPTH_EXT = $8071;
  GL_TEXTURE_WRAP_R_EXT = $8072;
  GL_MAX_3D_TEXTURE_SIZE_EXT = $8073;
var
  glTexImage3DEXT: procedure(target: GLenum; level: GLint; internalformat: GLenum; width: GLsizei; height: GLsizei; depth: GLsizei; border: GLint; format: GLenum; _type: GLenum; const pixels: PGLvoid); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}

function Load_GL_EXT_texture3D: Boolean;

//***** GL_EXT_texture_compression_s3tc *****//
const
  GL_COMPRESSED_RGB_S3TC_DXT1_EXT = $83F0;
  GL_COMPRESSED_RGBA_S3TC_DXT1_EXT = $83F1;
  GL_COMPRESSED_RGBA_S3TC_DXT3_EXT = $83F2;
  GL_COMPRESSED_RGBA_S3TC_DXT5_EXT = $83F3;

function Load_GL_EXT_texture_compression_s3tc: Boolean;

//***** GL_EXT_texture_env_add *****//

function Load_GL_EXT_texture_env_add: Boolean;

//***** GL_EXT_texture_env_combine *****//
const
  GL_COMBINE_EXT = $8570;
  GL_COMBINE_RGB_EXT = $8571;
  GL_COMBINE_ALPHA_EXT = $8572;
  GL_SOURCE0_RGB_EXT = $8580;
  GL_SOURCE1_RGB_EXT = $8581;
  GL_SOURCE2_RGB_EXT = $8582;
  GL_SOURCE0_ALPHA_EXT = $8588;
  GL_SOURCE1_ALPHA_EXT = $8589;
  GL_SOURCE2_ALPHA_EXT = $858A;
  GL_OPERAND0_RGB_EXT = $8590;
  GL_OPERAND1_RGB_EXT = $8591;
  GL_OPERAND2_RGB_EXT = $8592;
  GL_OPERAND0_ALPHA_EXT = $8598;
  GL_OPERAND1_ALPHA_EXT = $8599;
  GL_OPERAND2_ALPHA_EXT = $859A;
  GL_RGB_SCALE_EXT = $8573;
  GL_ADD_SIGNED_EXT = $8574;
  GL_INTERPOLATE_EXT = $8575;
  GL_CONSTANT_EXT = $8576;
  GL_PRIMARY_COLOR_EXT = $8577;
  GL_PREVIOUS_EXT = $8578;

function Load_GL_EXT_texture_env_combine: Boolean;

//***** GL_EXT_texture_env_dot3 *****//
const
  GL_DOT3_RGB_EXT = $8740;
  GL_DOT3_RGBA_EXT = $8741;

function Load_GL_EXT_texture_env_dot3: Boolean;

//***** GL_EXT_texture_filter_anisotropic *****//
const
  GL_TEXTURE_MAX_ANISOTROPY_EXT = $84FE;
  GL_MAX_TEXTURE_MAX_ANISOTROPY_EXT = $84FF;

function Load_GL_EXT_texture_filter_anisotropic: Boolean;

//***** GL_EXT_texture_lod_bias *****//
const
  GL_TEXTURE_FILTER_CONTROL_EXT = $8500;
  GL_TEXTURE_LOD_BIAS_EXT = $8501;
  GL_MAX_TEXTURE_LOD_BIAS_EXT = $84FD;

function Load_GL_EXT_texture_lod_bias: Boolean;

//***** GL_EXT_texture_object *****//
const
  GL_TEXTURE_PRIORITY_EXT = $8066;
  GL_TEXTURE_RESIDENT_EXT = $8067;
  GL_TEXTURE_1D_BINDING_EXT = $8068;
  GL_TEXTURE_2D_BINDING_EXT = $8069;
  GL_TEXTURE_3D_BINDING_EXT = $806A;
var
  glGenTexturesEXT: procedure(n: GLsizei; textures: PGLuint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glDeleteTexturesEXT: procedure(n: GLsizei; const textures: PGLuint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glBindTextureEXT: procedure(target: GLenum; texture: GLuint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glPrioritizeTexturesEXT: procedure(n: GLsizei; const textures: PGLuint; const priorities: PGLclampf); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glAreTexturesResidentEXT: function(n: GLsizei; const textures: PGLuint; residences: PGLboolean): GLboolean; {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glIsTextureEXT: function(texture: GLuint): GLboolean; {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}

function Load_GL_EXT_texture_object: Boolean;

//***** GL_EXT_vertex_array *****//
const
  GL_VERTEX_ARRAY_EXT = $8074;
  GL_NORMAL_ARRAY_EXT = $8075;
  GL_COLOR_ARRAY_EXT = $8076;
  GL_INDEX_ARRAY_EXT = $8077;
  GL_TEXTURE_COORD_ARRAY_EXT = $8078;
  GL_EDGE_FLAG_ARRAY_EXT = $8079;
  GL_DOUBLE_EXT = $140A;
  GL_VERTEX_ARRAY_SIZE_EXT = $807A;
  GL_VERTEX_ARRAY_TYPE_EXT = $807B;
  GL_VERTEX_ARRAY_STRIDE_EXT = $807C;
  GL_VERTEX_ARRAY_COUNT_EXT = $807D;
  GL_NORMAL_ARRAY_TYPE_EXT = $807E;
  GL_NORMAL_ARRAY_STRIDE_EXT = $807F;
  GL_NORMAL_ARRAY_COUNT_EXT = $8080;
  GL_COLOR_ARRAY_SIZE_EXT = $8081;
  GL_COLOR_ARRAY_TYPE_EXT = $8082;
  GL_COLOR_ARRAY_STRIDE_EXT = $8083;
  GL_COLOR_ARRAY_COUNT_EXT = $8084;
  GL_INDEX_ARRAY_TYPE_EXT = $8085;
  GL_INDEX_ARRAY_STRIDE_EXT = $8086;
  GL_INDEX_ARRAY_COUNT_EXT = $8087;
  GL_TEXTURE_COORD_ARRAY_SIZE_EXT = $8088;
  GL_TEXTURE_COORD_ARRAY_TYPE_EXT = $8089;
  GL_TEXTURE_COORD_ARRAY_STRIDE_EXT = $808A;
  GL_TEXTURE_COORD_ARRAY_COUNT_EXT = $808B;
  GL_EDGE_FLAG_ARRAY_STRIDE_EXT = $808C;
  GL_EDGE_FLAG_ARRAY_COUNT_EXT = $808D;
  GL_VERTEX_ARRAY_POINTER_EXT = $808E;
  GL_NORMAL_ARRAY_POINTER_EXT = $808F;
  GL_COLOR_ARRAY_POINTER_EXT = $8090;
  GL_INDEX_ARRAY_POINTER_EXT = $8091;
  GL_TEXTURE_COORD_ARRAY_POINTER_EXT = $8092;
  GL_EDGE_FLAG_ARRAY_POINTER_EXT = $8093;
var
  glArrayElementEXT: procedure(i: GLint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glDrawArraysEXT: procedure(mode: GLenum; first: GLint; count: GLsizei); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glVertexPointerEXT: procedure(size: GLint; _type: GLenum; stride: GLsizei; count: GLsizei; const pointer: PGLvoid); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glNormalPointerEXT: procedure(_type: GLenum; stride: GLsizei; count: GLsizei; const pointer: PGLvoid); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glColorPointerEXT: procedure(size: GLint; _type: GLenum; stride: GLsizei; count: GLsizei; const pointer: PGLvoid); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glIndexPointerEXT: procedure(_type: GLenum; stride: GLsizei; count: GLsizei; const pointer: PGLvoid); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glTexCoordPointerEXT: procedure(size: GLint; _type: GLenum; stride: GLsizei; count: GLsizei; const pointer: PGLvoid); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glEdgeFlagPointerEXT: procedure(stride: GLsizei; count: GLsizei; const pointer: PGLboolean); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glGetPointervEXT: procedure(pname: GLenum; params: PGLvoid); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}

function Load_GL_EXT_vertex_array: Boolean;

//***** GL_EXT_vertex_shader *****//
const
  GL_VERTEX_SHADER_EXT = $8780;
  GL_VARIANT_VALUE_EXT = $87E4;
  GL_VARIANT_DATATYPE_EXT = $87E5;
  GL_VARIANT_ARRAY_STRIDE_EXT = $87E6;
  GL_VARIANT_ARRAY_TYPE_EXT = $87E7;
  GL_VARIANT_ARRAY_EXT = $87E8;
  GL_VARIANT_ARRAY_POINTER_EXT = $87E9;
  GL_INVARIANT_VALUE_EXT = $87EA;
  GL_INVARIANT_DATATYPE_EXT = $87EB;
  GL_LOCAL_CONSTANT_VALUE_EXT = $87EC;
  GL_LOCAL_CONSTANT_DATATYPE_EXT = $87ED;
  GL_OP_INDEX_EXT = $8782;
  GL_OP_NEGATE_EXT = $8783;
  GL_OP_DOT3_EXT = $8784;
  GL_OP_DOT4_EXT = $8785;
  GL_OP_MUL_EXT = $8786;
  GL_OP_ADD_EXT = $8787;
  GL_OP_MADD_EXT = $8788;
  GL_OP_FRAC_EXT = $8789;
  GL_OP_MAX_EXT = $878A;
  GL_OP_MIN_EXT = $878B;
  GL_OP_SET_GE_EXT = $878C;
  GL_OP_SET_LT_EXT = $878D;
  GL_OP_CLAMP_EXT = $878E;
  GL_OP_FLOOR_EXT = $878F;
  GL_OP_ROUND_EXT = $8790;
  GL_OP_EXP_BASE_2_EXT = $8791;
  GL_OP_LOG_BASE_2_EXT = $8792;
  GL_OP_POWER_EXT = $8793;
  GL_OP_RECIP_EXT = $8794;
  GL_OP_RECIP_SQRT_EXT = $8795;
  GL_OP_SUB_EXT = $8796;
  GL_OP_CROSS_PRODUCT_EXT = $8797;
  GL_OP_MULTIPLY_MATRIX_EXT = $8798;
  GL_OP_MOV_EXT = $8799;
  GL_OUTPUT_VERTEX_EXT = $879A;
  GL_OUTPUT_COLOR0_EXT = $879B;
  GL_OUTPUT_COLOR1_EXT = $879C;
  GL_OUTPUT_TEXTURE_COORD0_EXT = $879D;
  GL_OUTPUT_TEXTURE_COORD1_EXT = $879E;
  GL_OUTPUT_TEXTURE_COORD2_EXT = $879F;
  GL_OUTPUT_TEXTURE_COORD3_EXT = $87A0;
  GL_OUTPUT_TEXTURE_COORD4_EXT = $87A1;
  GL_OUTPUT_TEXTURE_COORD5_EXT = $87A2;
  GL_OUTPUT_TEXTURE_COORD6_EXT = $87A3;
  GL_OUTPUT_TEXTURE_COORD7_EXT = $87A4;
  GL_OUTPUT_TEXTURE_COORD8_EXT = $87A5;
  GL_OUTPUT_TEXTURE_COORD9_EXT = $87A6;
  GL_OUTPUT_TEXTURE_COORD10_EXT = $87A7;
  GL_OUTPUT_TEXTURE_COORD11_EXT = $87A8;
  GL_OUTPUT_TEXTURE_COORD12_EXT = $87A9;
  GL_OUTPUT_TEXTURE_COORD13_EXT = $87AA;
  GL_OUTPUT_TEXTURE_COORD14_EXT = $87AB;
  GL_OUTPUT_TEXTURE_COORD15_EXT = $87AC;
  GL_OUTPUT_TEXTURE_COORD16_EXT = $87AD;
  GL_OUTPUT_TEXTURE_COORD17_EXT = $87AE;
  GL_OUTPUT_TEXTURE_COORD18_EXT = $87AF;
  GL_OUTPUT_TEXTURE_COORD19_EXT = $87B0;
  GL_OUTPUT_TEXTURE_COORD20_EXT = $87B1;
  GL_OUTPUT_TEXTURE_COORD21_EXT = $87B2;
  GL_OUTPUT_TEXTURE_COORD22_EXT = $87B3;
  GL_OUTPUT_TEXTURE_COORD23_EXT = $87B4;
  GL_OUTPUT_TEXTURE_COORD24_EXT = $87B5;
  GL_OUTPUT_TEXTURE_COORD25_EXT = $87B6;
  GL_OUTPUT_TEXTURE_COORD26_EXT = $87B7;
  GL_OUTPUT_TEXTURE_COORD27_EXT = $87B8;
  GL_OUTPUT_TEXTURE_COORD28_EXT = $87B9;
  GL_OUTPUT_TEXTURE_COORD29_EXT = $87BA;
  GL_OUTPUT_TEXTURE_COORD30_EXT = $87BB;
  GL_OUTPUT_TEXTURE_COORD31_EXT = $87BC;
  GL_OUTPUT_FOG_EXT = $87BD;
  GL_SCALAR_EXT = $87BE;
  GL_VECTOR_EXT = $87BF;
  GL_MATRIX_EXT = $87C0;
  GL_VARIANT_EXT = $87C1;
  GL_INVARIANT_EXT = $87C2;
  GL_LOCAL_CONSTANT_EXT = $87C3;
  GL_LOCAL_EXT = $87C4;
  GL_MAX_VERTEX_SHADER_INSTRUCTIONS_EXT = $87C5;
  GL_MAX_VERTEX_SHADER_VARIANTS_EXT = $87C6;
  GL_MAX_VERTEX_SHADER_INVARIANTS_EXT = $87C7;
  GL_MAX_VERTEX_SHADER_LOCAL_CONSTANTS_EXT = $87C8;
  GL_MAX_VERTEX_SHADER_LOCALS_EXT = $87C9;
  GL_MAX_OPTIMIZED_VERTEX_SHADER_INSTRUCTIONS_EXT = $87CA;
  GL_MAX_OPTIMIZED_VERTEX_SHADER_VARIANTS_EXT = $87CB;
  GL_MAX_OPTIMIZED_VERTEX_SHADER_LOCAL_CONSTANTS_EXT = $87CC;
  GL_MAX_OPTIMIZED_VERTEX_SHADER_INVARIANTS_EXT = $87CD;
  GL_MAX_OPTIMIZED_VERTEX_SHADER_LOCALS_EXT = $87CE;
  GL_VERTEX_SHADER_INSTRUCTIONS_EXT = $87CF;
  GL_VERTEX_SHADER_VARIANTS_EXT = $87D0;
  GL_VERTEX_SHADER_INVARIANTS_EXT = $87D1;
  GL_VERTEX_SHADER_LOCAL_CONSTANTS_EXT = $87D2;
  GL_VERTEX_SHADER_LOCALS_EXT = $87D3;
  GL_VERTEX_SHADER_BINDING_EXT = $8781;
  GL_VERTEX_SHADER_OPTIMIZED_EXT = $87D4;
  GL_X_EXT = $87D5;
  GL_Y_EXT = $87D6;
  GL_Z_EXT = $87D7;
  GL_W_EXT = $87D8;
  GL_NEGATIVE_X_EXT = $87D9;
  GL_NEGATIVE_Y_EXT = $87DA;
  GL_NEGATIVE_Z_EXT = $87DB;
  GL_NEGATIVE_W_EXT = $87DC;
  GL_ZERO_EXT = $87DD;
  GL_ONE_EXT = $87DE;
  GL_NEGATIVE_ONE_EXT = $87DF;
  GL_NORMALIZED_RANGE_EXT = $87E0;
  GL_FULL_RANGE_EXT = $87E1;
  GL_CURRENT_VERTEX_EXT = $87E2;
  GL_MVP_MATRIX_EXT = $87E3;
var
  glBeginVertexShaderEXT: procedure(); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glEndVertexShaderEXT: procedure(); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glBindVertexShaderEXT: procedure(id: GLuint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glGenVertexShadersEXT: function(range: GLuint): GLuint; {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glDeleteVertexShaderEXT: procedure(id: GLuint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glShaderOp1EXT: procedure(op: GLenum; res: GLuint; arg1: GLuint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glShaderOp2EXT: procedure(op: GLenum; res: GLuint; arg1: GLuint; arg2: GLuint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glShaderOp3EXT: procedure(op: GLenum; res: GLuint; arg1: GLuint; arg2: GLuint; arg3: GLuint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glSwizzleEXT: procedure(res: GLuint; _in: GLuint; outX: GLenum; outY: GLenum; outZ: GLenum; outW: GLenum); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glWriteMaskEXT: procedure(res: GLuint; _in: GLuint; outX: GLenum; outY: GLenum; outZ: GLenum; outW: GLenum); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glInsertComponentEXT: procedure(res: GLuint; src: GLuint; num: GLuint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glExtractComponentEXT: procedure(res: GLuint; src: GLuint; num: GLuint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glGenSymbolsEXT: function(datatype: GLenum; storagetype: GLenum; range: GLenum; components: GLuint): GLuint; {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glSetInvariantEXT: procedure(id: GLuint; _type: GLenum; addr: PGLvoid); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glSetLocalConstantEXT: procedure(id: GLuint; _type: GLenum; addr: PGLvoid); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glVariantbvEXT: procedure(id: GLuint; addr: PGLbyte); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glVariantsvEXT: procedure(id: GLuint; addr: PGLshort); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glVariantivEXT: procedure(id: GLuint; addr: PGLint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glVariantfvEXT: procedure(id: GLuint; addr: PGLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glVariantdvEXT: procedure(id: GLuint; addr: PGLdouble); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glVariantubvEXT: procedure(id: GLuint; addr: PGLubyte); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glVariantusvEXT: procedure(id: GLuint; addr: PGLushort); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glVariantuivEXT: procedure(id: GLuint; addr: PGLuint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glVariantPointerEXT: procedure(id: GLuint; _type: GLenum; stride: GLuint; addr: PGLvoid); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glEnableVariantClientStateEXT: procedure(id: GLuint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glDisableVariantClientStateEXT: procedure(id: GLuint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glBindLightParameterEXT: function(light: GLenum; value: GLenum): GLuint; {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glBindMaterialParameterEXT: function(face: GLenum; value: GLenum): GLuint; {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glBindTexGenParameterEXT: function(_unit: GLenum; coord: GLenum; value: GLenum): GLuint; {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glBindTextureUnitParameterEXT: function(_unit: GLenum; value: GLenum): GLuint; {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glBindParameterEXT: function(value: GLenum): GLuint; {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glIsVariantEnabledEXT: function(id: GLuint; cap: GLenum): GLboolean; {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glGetVariantBooleanvEXT: procedure(id: GLuint; value: GLenum; data: PGLboolean); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glGetVariantIntegervEXT: procedure(id: GLuint; value: GLenum; data: PGLint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glGetVariantFloatvEXT: procedure(id: GLuint; value: GLenum; data: PGLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glGetVariantPointervEXT: procedure(id: GLuint; value: GLenum; data: PGLvoid); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glGetInvariantBooleanvEXT: procedure(id: GLuint; value: GLenum; data: PGLboolean); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glGetInvariantIntegervEXT: procedure(id: GLuint; value: GLenum; data: PGLint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glGetInvariantFloatvEXT: procedure(id: GLuint; value: GLenum; data: PGLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glGetLocalConstantBooleanvEXT: procedure(id: GLuint; value: GLenum; data: PGLboolean); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glGetLocalConstantIntegervEXT: procedure(id: GLuint; value: GLenum; data: PGLint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glGetLocalConstantFloatvEXT: procedure(id: GLuint; value: GLenum; data: PGLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}

function Load_GL_EXT_vertex_shader: Boolean;

//***** GL_EXT_vertex_weighting *****//
const
  GL_VERTEX_WEIGHTING_EXT = $8509;
  GL_MODELVIEW0_EXT = $1700;
  GL_MODELVIEW1_EXT = $850A;
  GL_MODELVIEW0_MATRIX_EXT = $0BA6;
  GL_MODELVIEW1_MATRIX_EXT = $8506;
  GL_CURRENT_VERTEX_WEIGHT_EXT = $850B;
  GL_VERTEX_WEIGHT_ARRAY_EXT = $850C;
  GL_VERTEX_WEIGHT_ARRAY_SIZE_EXT = $850D;
  GL_VERTEX_WEIGHT_ARRAY_TYPE_EXT = $850E;
  GL_VERTEX_WEIGHT_ARRAY_STRIDE_EXT = $850F;
  GL_MODELVIEW0_STACK_DEPTH_EXT = $0BA3;
  GL_MODELVIEW1_STACK_DEPTH_EXT = $8502;
  GL_VERTEX_WEIGHT_ARRAY_POINTER_EXT = $8510;
var
  glVertexWeightfEXT: procedure(weight: GLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glVertexWeightfvEXT: procedure(weight: PGLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glVertexWeightPointerEXT: procedure(size: GLint; _type: GLenum; stride: GLsizei; pointer: PGLvoid); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}

function Load_GL_EXT_vertex_weighting: Boolean;

//***** GL_HP_occlusion_test *****//
const
  GL_OCCLUSION_TEST_HP = $8165;
  GL_OCCLUSION_TEST_RESULT_HP = $8166;

function Load_GL_HP_occlusion_test: Boolean;

//***** GL_NV_blend_square *****//

function Load_GL_NV_blend_square: Boolean;

//***** GL_NV_copy_depth_to_color *****//
const
  GL_DEPTH_STENCIL_TO_RGBA_NV = $886E;
  GL_DEPTH_STENCIL_TO_BGRA_NV = $886F;

function Load_GL_NV_copy_depth_to_color: Boolean;

//***** GL_NV_depth_clamp *****//
const
  GL_DEPTH_CLAMP_NV = $864F;

function Load_GL_NV_depth_clamp: Boolean;

//***** GL_NV_evaluators *****//
const
  GL_EVAL_2D_NV = $86C0;
  GL_EVAL_TRIANGULAR_2D_NV = $86C1;
  GL_MAP_TESSELLATION_NV = $86C2;
  GL_MAP_ATTRIB_U_ORDER_NV = $86C3;
  GL_MAP_ATTRIB_V_ORDER_NV = $86C4;
  GL_EVAL_FRACTIONAL_TESSELLATION_NV = $86C5;
  GL_EVAL_VERTEX_ATTRIB0_NV = $86C6;
  GL_EVAL_VERTEX_ATTRIB1_NV = $86C7;
  GL_EVAL_VERTEX_ATTRIB2_NV = $86C8;
  GL_EVAL_VERTEX_ATTRIB3_NV = $86C9;
  GL_EVAL_VERTEX_ATTRIB4_NV = $86CA;
  GL_EVAL_VERTEX_ATTRIB5_NV = $86CB;
  GL_EVAL_VERTEX_ATTRIB6_NV = $86CC;
  GL_EVAL_VERTEX_ATTRIB7_NV = $86CD;
  GL_EVAL_VERTEX_ATTRIB8_NV = $86CE;
  GL_EVAL_VERTEX_ATTRIB9_NV = $86CF;
  GL_EVAL_VERTEX_ATTRIB10_NV = $86D0;
  GL_EVAL_VERTEX_ATTRIB11_NV = $86D1;
  GL_EVAL_VERTEX_ATTRIB12_NV = $86D2;
  GL_EVAL_VERTEX_ATTRIB13_NV = $86D3;
  GL_EVAL_VERTEX_ATTRIB14_NV = $86D4;
  GL_EVAL_VERTEX_ATTRIB15_NV = $86D5;
  GL_MAX_MAP_TESSELLATION_NV = $86D6;
  GL_MAX_RATIONAL_EVAL_ORDER_NV = $86D7;
var
  glMapControlPointsNV: procedure(target: GLenum; index: GLuint; _type: GLenum; ustride: GLsizei; vstride: GLsizei; uorder: GLint; vorder: GLint; _packed: GLboolean; const points: PGLvoid); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glMapParameterivNV: procedure(target: GLenum; pname: GLenum; const params: PGLint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glMapParameterfvNV: procedure(target: GLenum; pname: GLenum; const params: PGLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glGetMapControlPointsNV: procedure(target: GLenum; index: GLuint; _type: GLenum; ustride: GLsizei; vstride: GLsizei; _packed: GLboolean; points: PGLvoid); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glGetMapParameterivNV: procedure(target: GLenum; pname: GLenum; params: PGLint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glGetMapParameterfvNV: procedure(target: GLenum; pname: GLenum; params: PGLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glGetMapAttribParameterivNV: procedure(target: GLenum; index: GLuint; pname: GLenum; params: PGLint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glGetMapAttribParameterfvNV: procedure(target: GLenum; index: GLuint; pname: GLenum; params: PGLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glEvalMapsNV: procedure(target: GLenum; mode: GLenum); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}

function Load_GL_NV_evaluators: Boolean;

//***** GL_NV_fence *****//
const
  GL_ALL_COMPLETED_NV = $84F2;
  GL_FENCE_STATUS_NV = $84F3;
  GL_FENCE_CONDITION_NV = $84F4;
var
  glGenFencesNV: procedure(n: GLsizei; fences: PGLuint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glDeleteFencesNV: procedure(n: GLsizei; const fences: PGLuint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glSetFenceNV: procedure(fence: GLuint; condition: GLenum); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glTestFenceNV: function(fence: GLuint): GLboolean; {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glFinishFenceNV: procedure(fence: GLuint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glIsFenceNV: function(fence: GLuint): GLboolean; {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glGetFenceivNV: procedure(fence: GLuint; pname: GLenum; params: PGLint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}

function Load_GL_NV_fence: Boolean;

//***** GL_NV_fog_distance *****//
const
  GL_FOG_DISTANCE_MODE_NV = $855A;
  GL_EYE_RADIAL_NV = $855B;
  GL_EYE_PLANE_ABSOLUTE_NV = $855C;

function Load_GL_NV_fog_distance: Boolean;

//***** GL_NV_light_max_exponent *****//
const
  GL_MAX_SHININESS_NV = $8504;
  GL_MAX_SPOT_EXPONENT_NV = $8505;

function Load_GL_NV_light_max_exponent: Boolean;

//***** GL_NV_multisample_filter_hint *****//
const
  GL_MULTISAMPLE_FILTER_HINT_NV = $8534;

function Load_GL_NV_multisample_filter_hint: Boolean;

//***** GL_NV_occlusion_query *****//
  // GL_OCCLUSION_TEST_HP  { already defined }
  // GL_OCCLUSION_TEST_RESULT_HP  { already defined }
const
  GL_PIXEL_COUNTER_BITS_NV = $8864;
  GL_CURRENT_OCCLUSION_QUERY_ID_NV = $8865;
  GL_PIXEL_COUNT_NV = $8866;
  GL_PIXEL_COUNT_AVAILABLE_NV = $8867;
var
  glGenOcclusionQueriesNV: procedure(n: GLsizei; ids: PGLuint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glDeleteOcclusionQueriesNV: procedure(n: GLsizei; const ids: PGLuint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glIsOcclusionQueryNV: function(id: GLuint): GLboolean; {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glBeginOcclusionQueryNV: procedure(id: GLuint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glEndOcclusionQueryNV: procedure(); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glGetOcclusionQueryivNV: procedure(id: GLuint; pname: GLenum; params: PGLint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glGetOcclusionQueryuivNV: procedure(id: GLuint; pname: GLenum; params: PGLuint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}

function Load_GL_NV_occlusion_query: Boolean;

//***** GL_NV_packed_depth_stencil *****//
const
  GL_DEPTH_STENCIL_NV = $84F9;
  GL_UNSIGNED_INT_24_8_NV = $84FA;

function Load_GL_NV_packed_depth_stencil: Boolean;

//***** GL_NV_point_sprite *****//
const
  GL_POINT_SPRITE_NV = $8861;
  GL_COORD_REPLACE_NV = $8862;
  GL_POINT_SPRITE_R_MODE_NV = $8863;
var
  glPointParameteriNV: procedure(pname: GLenum; param: GLint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glPointParameterivNV: procedure(pname: GLenum; const params: PGLint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}

function Load_GL_NV_point_sprite: Boolean;

//***** GL_NV_register_combiners *****//
const
  GL_REGISTER_COMBINERS_NV = $8522;
  GL_COMBINER0_NV = $8550;
  GL_COMBINER1_NV = $8551;
  GL_COMBINER2_NV = $8552;
  GL_COMBINER3_NV = $8553;
  GL_COMBINER4_NV = $8554;
  GL_COMBINER5_NV = $8555;
  GL_COMBINER6_NV = $8556;
  GL_COMBINER7_NV = $8557;
  GL_VARIABLE_A_NV = $8523;
  GL_VARIABLE_B_NV = $8524;
  GL_VARIABLE_C_NV = $8525;
  GL_VARIABLE_D_NV = $8526;
  GL_VARIABLE_E_NV = $8527;
  GL_VARIABLE_F_NV = $8528;
  GL_VARIABLE_G_NV = $8529;
  GL_CONSTANT_COLOR0_NV = $852A;
  GL_CONSTANT_COLOR1_NV = $852B;
  GL_PRIMARY_COLOR_NV = $852C;
  GL_SECONDARY_COLOR_NV = $852D;
  GL_SPARE0_NV = $852E;
  GL_SPARE1_NV = $852F;
  GL_UNSIGNED_IDENTITY_NV = $8536;
  GL_UNSIGNED_INVERT_NV = $8537;
  GL_EXPAND_NORMAL_NV = $8538;
  GL_EXPAND_NEGATE_NV = $8539;
  GL_HALF_BIAS_NORMAL_NV = $853A;
  GL_HALF_BIAS_NEGATE_NV = $853B;
  GL_SIGNED_IDENTITY_NV = $853C;
  GL_SIGNED_NEGATE_NV = $853D;
  GL_E_TIMES_F_NV = $8531;
  GL_SPARE0_PLUS_SECONDARY_COLOR_NV = $8532;
  GL_SCALE_BY_TWO_NV = $853E;
  GL_SCALE_BY_FOUR_NV = $853F;
  GL_SCALE_BY_ONE_HALF_NV = $8540;
  GL_BIAS_BY_NEGATIVE_ONE_HALF_NV = $8541;
  GL_DISCARD_NV = $8530;
  GL_COMBINER_INPUT_NV = $8542;
  GL_COMBINER_MAPPING_NV = $8543;
  GL_COMBINER_COMPONENT_USAGE_NV = $8544;
  GL_COMBINER_AB_DOT_PRODUCT_NV = $8545;
  GL_COMBINER_CD_DOT_PRODUCT_NV = $8546;
  GL_COMBINER_MUX_SUM_NV = $8547;
  GL_COMBINER_SCALE_NV = $8548;
  GL_COMBINER_BIAS_NV = $8549;
  GL_COMBINER_AB_OUTPUT_NV = $854A;
  GL_COMBINER_CD_OUTPUT_NV = $854B;
  GL_COMBINER_SUM_OUTPUT_NV = $854C;
  GL_NUM_GENERAL_COMBINERS_NV = $854E;
  GL_COLOR_SUM_CLAMP_NV = $854F;
  GL_MAX_GENERAL_COMBINERS_NV = $854D;
var
  glCombinerParameterfvNV: procedure(pname: GLenum; const params: PGLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glCombinerParameterivNV: procedure(pname: GLenum; const params: PGLint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glCombinerParameterfNV: procedure(pname: GLenum; param: GLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glCombinerParameteriNV: procedure(pname: GLenum; param: GLint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glCombinerInputNV: procedure(stage: GLenum; portion: GLenum; variable: GLenum; input: GLenum; mapping: GLenum; componentUsage: GLenum); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glCombinerOutputNV: procedure(stage: GLenum; portion: GLenum; abOutput: GLenum; cdOutput: GLenum; sumOutput: GLenum; scale: GLenum; bias: GLenum; abDotProduct: GLboolean; cdDotProduct: GLboolean; muxSum: GLboolean); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glFinalCombinerInputNV: procedure(variable: GLenum; input: GLenum; mapping: GLenum; componentUsage: GLenum); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glGetCombinerInputParameterfvNV: procedure(stage: GLenum; portion: GLenum; variable: GLenum; pname: GLenum; params: PGLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glGetCombinerInputParameterivNV: procedure(stage: GLenum; portion: GLenum; variable: GLenum; pname: GLenum; params: PGLint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glGetCombinerOutputParameterfvNV: procedure(stage: GLenum; portion: GLenum; pname: GLenum; params: PGLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glGetCombinerOutputParameterivNV: procedure(stage: GLenum; portion: GLenum; pname: GLenum; params: PGLint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glGetFinalCombinerInputParameterfvNV: procedure(variable: GLenum; pname: GLenum; params: PGLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glGetFinalCombinerInputParameterivNV: procedure(variable: GLenum; pname: GLenum; params: PGLint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}

function Load_GL_NV_register_combiners: Boolean;

//***** GL_NV_register_combiners2 *****//
const
  GL_PER_STAGE_CONSTANTS_NV = $8535;
var
  glCombinerStageParameterfvNV: procedure(stage: GLenum; pname: GLenum; const params: PGLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glGetCombinerStageParameterfvNV: procedure(stage: GLenum; pname: GLenum; params: PGLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}

function Load_GL_NV_register_combiners2: Boolean;

//***** GL_NV_texgen_emboss *****//
const
  GL_EMBOSS_MAP_NV = $855F;
  GL_EMBOSS_LIGHT_NV = $855D;
  GL_EMBOSS_CONSTANT_NV = $855E;

function Load_GL_NV_texgen_emboss: Boolean;

//***** GL_NV_texgen_reflection *****//
const
  GL_NORMAL_MAP_NV = $8511;
  GL_REFLECTION_MAP_NV = $8512;

function Load_GL_NV_texgen_reflection: Boolean;

//***** GL_NV_texture_compression_vtc *****//
  // GL_COMPRESSED_RGB_S3TC_DXT1_EXT  { already defined }
  // GL_COMPRESSED_RGBA_S3TC_DXT1_EXT  { already defined }
  // GL_COMPRESSED_RGBA_S3TC_DXT3_EXT  { already defined }
  // GL_COMPRESSED_RGBA_S3TC_DXT5_EXT  { already defined }

function Load_GL_NV_texture_compression_vtc: Boolean;

//***** GL_NV_texture_env_combine4 *****//
const
  GL_COMBINE4_NV = $8503;
  GL_SOURCE3_RGB_NV = $8583;
  GL_SOURCE3_ALPHA_NV = $858B;
  GL_OPERAND3_RGB_NV = $8593;
  GL_OPERAND3_ALPHA_NV = $859B;

function Load_GL_NV_texture_env_combine4: Boolean;

//***** GL_NV_texture_rectangle *****//
const
  GL_TEXTURE_RECTANGLE_NV = $84F5;
  GL_TEXTURE_BINDING_RECTANGLE_NV = $84F6;
  GL_PROXY_TEXTURE_RECTANGLE_NV = $84F7;
  GL_MAX_RECTANGLE_TEXTURE_SIZE_NV = $84F8;

function Load_GL_NV_texture_rectangle: Boolean;

//***** GL_NV_texture_shader *****//
const
  GL_TEXTURE_SHADER_NV = $86DE;
  GL_RGBA_UNSIGNED_DOT_PRODUCT_MAPPING_NV = $86D9;
  GL_SHADER_OPERATION_NV = $86DF;
  GL_CULL_MODES_NV = $86E0;
  GL_OFFSET_TEXTURE_MATRIX_NV = $86E1;
  GL_OFFSET_TEXTURE_SCALE_NV = $86E2;
  GL_OFFSET_TEXTURE_BIAS_NV = $86E3;
  GL_PREVIOUS_TEXTURE_INPUT_NV = $86E4;
  GL_CONST_EYE_NV = $86E5;
  GL_SHADER_CONSISTENT_NV = $86DD;
  GL_PASS_THROUGH_NV = $86E6;
  GL_CULL_FRAGMENT_NV = $86E7;
  GL_OFFSET_TEXTURE_2D_NV = $86E8;
  GL_OFFSET_TEXTURE_RECTANGLE_NV = $864C;
  GL_OFFSET_TEXTURE_RECTANGLE_SCALE_NV = $864D;
  GL_DEPENDENT_AR_TEXTURE_2D_NV = $86E9;
  GL_DEPENDENT_GB_TEXTURE_2D_NV = $86EA;
  GL_DOT_PRODUCT_NV = $86EC;
  GL_DOT_PRODUCT_DEPTH_REPLACE_NV = $86ED;
  GL_DOT_PRODUCT_TEXTURE_2D_NV = $86EE;
  GL_DOT_PRODUCT_TEXTURE_RECTANGLE_NV = $864E;
  GL_DOT_PRODUCT_TEXTURE_CUBE_MAP_NV = $86F0;
  GL_DOT_PRODUCT_DIFFUSE_CUBE_MAP_NV = $86F1;
  GL_DOT_PRODUCT_REFLECT_CUBE_MAP_NV = $86F2;
  GL_DOT_PRODUCT_CONST_EYE_REFLECT_CUBE_MAP_NV = $86F3;
  GL_HILO_NV = $86F4;
  GL_DSDT_NV = $86F5;
  GL_DSDT_MAG_NV = $86F6;
  GL_DSDT_MAG_VIB_NV = $86F7;
  GL_UNSIGNED_INT_S8_S8_8_8_NV = $86DA;
  GL_UNSIGNED_INT_8_8_S8_S8_REV_NV = $86DB;
  GL_SIGNED_RGBA_NV = $86FB;
  GL_SIGNED_RGBA8_NV = $86FC;
  GL_SIGNED_RGB_NV = $86FE;
  GL_SIGNED_RGB8_NV = $86FF;
  GL_SIGNED_LUMINANCE_NV = $8701;
  GL_SIGNED_LUMINANCE8_NV = $8702;
  GL_SIGNED_LUMINANCE_ALPHA_NV = $8703;
  GL_SIGNED_LUMINANCE8_ALPHA8_NV = $8704;
  GL_SIGNED_ALPHA_NV = $8705;
  GL_SIGNED_ALPHA8_NV = $8706;
  GL_SIGNED_INTENSITY_NV = $8707;
  GL_SIGNED_INTENSITY8_NV = $8708;
  GL_SIGNED_RGB_UNSIGNED_ALPHA_NV = $870C;
  GL_SIGNED_RGB8_UNSIGNED_ALPHA8_NV = $870D;
  GL_HILO16_NV = $86F8;
  GL_SIGNED_HILO_NV = $86F9;
  GL_SIGNED_HILO16_NV = $86FA;
  GL_DSDT8_NV = $8709;
  GL_DSDT8_MAG8_NV = $870A;
  GL_DSDT_MAG_INTENSITY_NV = $86DC;
  GL_DSDT8_MAG8_INTENSITY8_NV = $870B;
  GL_HI_SCALE_NV = $870E;
  GL_LO_SCALE_NV = $870F;
  GL_DS_SCALE_NV = $8710;
  GL_DT_SCALE_NV = $8711;
  GL_MAGNITUDE_SCALE_NV = $8712;
  GL_VIBRANCE_SCALE_NV = $8713;
  GL_HI_BIAS_NV = $8714;
  GL_LO_BIAS_NV = $8715;
  GL_DS_BIAS_NV = $8716;
  GL_DT_BIAS_NV = $8717;
  GL_MAGNITUDE_BIAS_NV = $8718;
  GL_VIBRANCE_BIAS_NV = $8719;
  GL_TEXTURE_BORDER_VALUES_NV = $871A;
  GL_TEXTURE_HI_SIZE_NV = $871B;
  GL_TEXTURE_LO_SIZE_NV = $871C;
  GL_TEXTURE_DS_SIZE_NV = $871D;
  GL_TEXTURE_DT_SIZE_NV = $871E;
  GL_TEXTURE_MAG_SIZE_NV = $871F;

function Load_GL_NV_texture_shader: Boolean;

//***** GL_NV_texture_shader2 *****//
const
  GL_DOT_PRODUCT_TEXTURE_3D_NV = $86EF;
  // GL_HILO_NV  { already defined }
  // GL_DSDT_NV  { already defined }
  // GL_DSDT_MAG_NV  { already defined }
  // GL_DSDT_MAG_VIB_NV  { already defined }
  // GL_UNSIGNED_INT_S8_S8_8_8_NV  { already defined }
  // GL_UNSIGNED_INT_8_8_S8_S8_REV_NV  { already defined }
  // GL_SIGNED_RGBA_NV  { already defined }
  // GL_SIGNED_RGBA8_NV  { already defined }
  // GL_SIGNED_RGB_NV  { already defined }
  // GL_SIGNED_RGB8_NV  { already defined }
  // GL_SIGNED_LUMINANCE_NV  { already defined }
  // GL_SIGNED_LUMINANCE8_NV  { already defined }
  // GL_SIGNED_LUMINANCE_ALPHA_NV  { already defined }
  // GL_SIGNED_LUMINANCE8_ALPHA8_NV  { already defined }
  // GL_SIGNED_ALPHA_NV  { already defined }
  // GL_SIGNED_ALPHA8_NV  { already defined }
  // GL_SIGNED_INTENSITY_NV  { already defined }
  // GL_SIGNED_INTENSITY8_NV  { already defined }
  // GL_SIGNED_RGB_UNSIGNED_ALPHA_NV  { already defined }
  // GL_SIGNED_RGB8_UNSIGNED_ALPHA8_NV  { already defined }
  // GL_HILO16_NV  { already defined }
  // GL_SIGNED_HILO_NV  { already defined }
  // GL_SIGNED_HILO16_NV  { already defined }
  // GL_DSDT8_NV  { already defined }
  // GL_DSDT8_MAG8_NV  { already defined }
  // GL_DSDT_MAG_INTENSITY_NV  { already defined }
  // GL_DSDT8_MAG8_INTENSITY8_NV  { already defined }

function Load_GL_NV_texture_shader2: Boolean;

//***** GL_NV_texture_shader3 *****//
const
  GL_OFFSET_PROJECTIVE_TEXTURE_2D_NV = $8850;
  GL_OFFSET_PROJECTIVE_TEXTURE_2D_SCALE_NV = $8851;
  GL_OFFSET_PROJECTIVE_TEXTURE_RECTANGLE_NV = $8852;
  GL_OFFSET_PROJECTIVE_TEXTURE_RECTANGLE_SCALE_NV = $8853;
  GL_OFFSET_HILO_TEXTURE_2D_NV = $8854;
  GL_OFFSET_HILO_TEXTURE_RECTANGLE_NV = $8855;
  GL_OFFSET_HILO_PROJECTIVE_TEXTURE_2D_NV = $8856;
  GL_OFFSET_HILO_PROJECTIVE_TEXTURE_RECTANGLE_NV = $8857;
  GL_DEPENDENT_HILO_TEXTURE_2D_NV = $8858;
  GL_DEPENDENT_RGB_TEXTURE_3D_NV = $8859;
  GL_DEPENDENT_RGB_TEXTURE_CUBE_MAP_NV = $885A;
  GL_DOT_PRODUCT_PASS_THROUGH_NV = $885B;
  GL_DOT_PRODUCT_TEXTURE_1D_NV = $885C;
  GL_DOT_PRODUCT_AFFINE_DEPTH_REPLACE_NV = $885D;
  GL_HILO8_NV = $885E;
  GL_SIGNED_HILO8_NV = $885F;
  GL_FORCE_BLUE_TO_ONE_NV = $8860;

function Load_GL_NV_texture_shader3: Boolean;

//***** GL_NV_vertex_array_range *****//
const
  GL_VERTEX_ARRAY_RANGE_NV = $851D;
  GL_VERTEX_ARRAY_RANGE_LENGTH_NV = $851E;
  GL_VERTEX_ARRAY_RANGE_VALID_NV = $851F;
  GL_MAX_VERTEX_ARRAY_RANGE_ELEMENT_NV = $8520;
  GL_VERTEX_ARRAY_RANGE_POINTER_NV = $8521;
var
  glVertexArrayRangeNV: procedure(length: GLsizei; pointer: PGLvoid); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glFlushVertexArrayRangeNV: procedure(); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
{$IFDEF WINDOWS}
  wglAllocateMemoryNV: function(size: GLsizei; readFrequency: GLfloat; writeFrequency: GLfloat; priority: GLfloat): PGLvoid; {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  wglFreeMemoryNV: procedure(pointer: PGLvoid); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
{$ENDIF}

function Load_GL_NV_vertex_array_range: Boolean;

//***** GL_NV_vertex_array_range2 *****//
const
  GL_VERTEX_ARRAY_RANGE_WITHOUT_FLUSH_NV = $8533;

function Load_GL_NV_vertex_array_range2: Boolean;

//***** GL_NV_vertex_program *****//
const
  GL_VERTEX_PROGRAM_NV = $8620;
  GL_VERTEX_PROGRAM_POINT_SIZE_NV = $8642;
  GL_VERTEX_PROGRAM_TWO_SIDE_NV = $8643;
  GL_VERTEX_STATE_PROGRAM_NV = $8621;
  GL_ATTRIB_ARRAY_SIZE_NV = $8623;
  GL_ATTRIB_ARRAY_STRIDE_NV = $8624;
  GL_ATTRIB_ARRAY_TYPE_NV = $8625;
  GL_CURRENT_ATTRIB_NV = $8626;
  GL_PROGRAM_PARAMETER_NV = $8644;
  GL_ATTRIB_ARRAY_POINTER_NV = $8645;
  GL_PROGRAM_TARGET_NV = $8646;
  GL_PROGRAM_LENGTH_NV = $8627;
  GL_PROGRAM_RESIDENT_NV = $8647;
  GL_PROGRAM_STRING_NV = $8628;
  GL_TRACK_MATRIX_NV = $8648;
  GL_TRACK_MATRIX_TRANSFORM_NV = $8649;
  GL_MAX_TRACK_MATRIX_STACK_DEPTH_NV = $862E;
  GL_MAX_TRACK_MATRICES_NV = $862F;
  GL_CURRENT_MATRIX_STACK_DEPTH_NV = $8640;
  GL_CURRENT_MATRIX_NV = $8641;
  GL_VERTEX_PROGRAM_BINDING_NV = $864A;
  GL_PROGRAM_ERROR_POSITION_NV = $864B;
  GL_MODELVIEW_PROJECTION_NV = $8629;
  GL_MATRIX0_NV = $8630;
  GL_MATRIX1_NV = $8631;
  GL_MATRIX2_NV = $8632;
  GL_MATRIX3_NV = $8633;
  GL_MATRIX4_NV = $8634;
  GL_MATRIX5_NV = $8635;
  GL_MATRIX6_NV = $8636;
  GL_MATRIX7_NV = $8637;
  GL_IDENTITY_NV = $862A;
  GL_INVERSE_NV = $862B;
  GL_TRANSPOSE_NV = $862C;
  GL_INVERSE_TRANSPOSE_NV = $862D;
  GL_VERTEX_ATTRIB_ARRAY0_NV = $8650;
  GL_VERTEX_ATTRIB_ARRAY1_NV = $8651;
  GL_VERTEX_ATTRIB_ARRAY2_NV = $8652;
  GL_VERTEX_ATTRIB_ARRAY3_NV = $8653;
  GL_VERTEX_ATTRIB_ARRAY4_NV = $8654;
  GL_VERTEX_ATTRIB_ARRAY5_NV = $8655;
  GL_VERTEX_ATTRIB_ARRAY6_NV = $8656;
  GL_VERTEX_ATTRIB_ARRAY7_NV = $8657;
  GL_VERTEX_ATTRIB_ARRAY8_NV = $8658;
  GL_VERTEX_ATTRIB_ARRAY9_NV = $8659;
  GL_VERTEX_ATTRIB_ARRAY10_NV = $865A;
  GL_VERTEX_ATTRIB_ARRAY11_NV = $865B;
  GL_VERTEX_ATTRIB_ARRAY12_NV = $865C;
  GL_VERTEX_ATTRIB_ARRAY13_NV = $865D;
  GL_VERTEX_ATTRIB_ARRAY14_NV = $865E;
  GL_VERTEX_ATTRIB_ARRAY15_NV = $865F;
  GL_MAP1_VERTEX_ATTRIB0_4_NV = $8660;
  GL_MAP1_VERTEX_ATTRIB1_4_NV = $8661;
  GL_MAP1_VERTEX_ATTRIB2_4_NV = $8662;
  GL_MAP1_VERTEX_ATTRIB3_4_NV = $8663;
  GL_MAP1_VERTEX_ATTRIB4_4_NV = $8664;
  GL_MAP1_VERTEX_ATTRIB5_4_NV = $8665;
  GL_MAP1_VERTEX_ATTRIB6_4_NV = $8666;
  GL_MAP1_VERTEX_ATTRIB7_4_NV = $8667;
  GL_MAP1_VERTEX_ATTRIB8_4_NV = $8668;
  GL_MAP1_VERTEX_ATTRIB9_4_NV = $8669;
  GL_MAP1_VERTEX_ATTRIB10_4_NV = $866A;
  GL_MAP1_VERTEX_ATTRIB11_4_NV = $866B;
  GL_MAP1_VERTEX_ATTRIB12_4_NV = $866C;
  GL_MAP1_VERTEX_ATTRIB13_4_NV = $866D;
  GL_MAP1_VERTEX_ATTRIB14_4_NV = $866E;
  GL_MAP1_VERTEX_ATTRIB15_4_NV = $866F;
  GL_MAP2_VERTEX_ATTRIB0_4_NV = $8670;
  GL_MAP2_VERTEX_ATTRIB1_4_NV = $8671;
  GL_MAP2_VERTEX_ATTRIB2_4_NV = $8672;
  GL_MAP2_VERTEX_ATTRIB3_4_NV = $8673;
  GL_MAP2_VERTEX_ATTRIB4_4_NV = $8674;
  GL_MAP2_VERTEX_ATTRIB5_4_NV = $8675;
  GL_MAP2_VERTEX_ATTRIB6_4_NV = $8676;
  GL_MAP2_VERTEX_ATTRIB7_4_NV = $8677;
  GL_MAP2_VERTEX_ATTRIB8_4_NV = $8678;
  GL_MAP2_VERTEX_ATTRIB9_4_NV = $8679;
  GL_MAP2_VERTEX_ATTRIB10_4_NV = $867A;
  GL_MAP2_VERTEX_ATTRIB11_4_NV = $867B;
  GL_MAP2_VERTEX_ATTRIB12_4_NV = $867C;
  GL_MAP2_VERTEX_ATTRIB13_4_NV = $867D;
  GL_MAP2_VERTEX_ATTRIB14_4_NV = $867E;
  GL_MAP2_VERTEX_ATTRIB15_4_NV = $867F;
var
  glBindProgramNV: procedure(target: GLenum; id: GLuint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glDeleteProgramsNV: procedure(n: GLsizei; const ids: PGLuint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glExecuteProgramNV: procedure(target: GLenum; id: GLuint; const params: PGLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glGenProgramsNV: procedure(n: GLsizei; ids: PGLuint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glAreProgramsResidentNV: function(n: GLsizei; const ids: PGLuint; residences: PGLboolean): GLboolean; {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glRequestResidentProgramsNV: procedure(n: GLsizei; ids: PGLuint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glGetProgramParameterfvNV: procedure(target: GLenum; index: GLuint; pname: GLenum; params: PGLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glGetProgramParameterdvNV: procedure(target: GLenum; index: GLuint; pname: GLenum; params: PGLdouble); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glGetProgramivNV: procedure(id: GLuint; pname: GLenum; params: PGLint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glGetProgramStringNV: procedure(id: GLuint; pname: GLenum; _program: PGLubyte); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glGetTrackMatrixivNV: procedure(target: GLenum; address: GLuint; pname: GLenum; params: PGLint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glGetVertexAttribdvNV: procedure(index: GLuint; pname: GLenum; params: PGLdouble); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glGetVertexAttribfvNV: procedure(index: GLuint; pname: GLenum; params: PGLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glGetVertexAttribivNV: procedure(index: GLuint; pname: GLenum; params: PGLint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glGetVertexAttribPointervNV: procedure(index: GLuint; pname: GLenum; pointer: PGLvoid); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glIsProgramNV: function(id: GLuint): GLboolean; {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glLoadProgramNV: procedure(target: GLenum; id: GLuint; len: GLsizei; const _program: PGLubyte); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glProgramParameter4fNV: procedure(target: GLenum; index: GLuint; x: GLfloat; y: GLfloat; z: GLfloat; w: GLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glProgramParameter4fvNV: procedure(target: GLenum; index: GLuint; const params: PGLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glProgramParameters4dvNV: procedure(target: GLenum; index: GLuint; num: GLuint; const params: PGLdouble); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glProgramParameters4fvNV: procedure(target: GLenum; index: GLuint; num: GLuint; const params: PGLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glTrackMatrixNV: procedure(target: GLenum; address: GLuint; matrix: GLenum; transform: GLenum); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glVertexAttribPointerNV: procedure(index: GLuint; size: GLint; _type: GLenum; stride: GLsizei; const pointer: PGLvoid); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glVertexAttrib1sNV: procedure(index: GLuint; x: GLshort); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glVertexAttrib1fNV: procedure(index: GLuint; x: GLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glVertexAttrib1dNV: procedure(index: GLuint; x: GLdouble); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glVertexAttrib2sNV: procedure(index: GLuint; x: GLshort; y: GLshort); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glVertexAttrib2fNV: procedure(index: GLuint; x: GLfloat; y: GLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glVertexAttrib2dNV: procedure(index: GLuint; x: GLdouble; y: GLdouble); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glVertexAttrib3sNV: procedure(index: GLuint; x: GLshort; y: GLshort; z: GLshort); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glVertexAttrib3fNV: procedure(index: GLuint; x: GLfloat; y: GLfloat; z: GLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glVertexAttrib3dNV: procedure(index: GLuint; x: GLdouble; y: GLdouble; z: GLdouble); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glVertexAttrib4sNV: procedure(index: GLuint; x: GLshort; y: GLshort; z: GLshort; w: GLshort); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glVertexAttrib4fNV: procedure(index: GLuint; x: GLfloat; y: GLfloat; z: GLfloat; w: GLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glVertexAttrib4dNV: procedure(index: GLuint; x: GLdouble; y: GLdouble; z: GLdouble; w: GLdouble); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glVertexAttrib4ubNV: procedure(index: GLuint; x: GLubyte; y: GLubyte; z: GLubyte; w: GLubyte); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glVertexAttrib1svNV: procedure(index: GLuint; const v: PGLshort); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glVertexAttrib1fvNV: procedure(index: GLuint; const v: PGLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glVertexAttrib1dvNV: procedure(index: GLuint; const v: PGLdouble); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glVertexAttrib2svNV: procedure(index: GLuint; const v: PGLshort); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glVertexAttrib2fvNV: procedure(index: GLuint; const v: PGLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glVertexAttrib2dvNV: procedure(index: GLuint; const v: PGLdouble); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glVertexAttrib3svNV: procedure(index: GLuint; const v: PGLshort); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glVertexAttrib3fvNV: procedure(index: GLuint; const v: PGLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glVertexAttrib3dvNV: procedure(index: GLuint; const v: PGLdouble); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glVertexAttrib4svNV: procedure(index: GLuint; const v: PGLshort); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glVertexAttrib4fvNV: procedure(index: GLuint; const v: PGLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glVertexAttrib4dvNV: procedure(index: GLuint; const v: PGLdouble); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glVertexAttrib4ubvNV: procedure(index: GLuint; const v: PGLubyte); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glVertexAttribs1svNV: procedure(index: GLuint; n: GLsizei; const v: PGLshort); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glVertexAttribs1fvNV: procedure(index: GLuint; n: GLsizei; const v: PGLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glVertexAttribs1dvNV: procedure(index: GLuint; n: GLsizei; const v: PGLdouble); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glVertexAttribs2svNV: procedure(index: GLuint; n: GLsizei; const v: PGLshort); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glVertexAttribs2fvNV: procedure(index: GLuint; n: GLsizei; const v: PGLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glVertexAttribs2dvNV: procedure(index: GLuint; n: GLsizei; const v: PGLdouble); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glVertexAttribs3svNV: procedure(index: GLuint; n: GLsizei; const v: PGLshort); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glVertexAttribs3fvNV: procedure(index: GLuint; n: GLsizei; const v: PGLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glVertexAttribs3dvNV: procedure(index: GLuint; n: GLsizei; const v: PGLdouble); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glVertexAttribs4svNV: procedure(index: GLuint; n: GLsizei; const v: PGLshort); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glVertexAttribs4fvNV: procedure(index: GLuint; n: GLsizei; const v: PGLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glVertexAttribs4dvNV: procedure(index: GLuint; n: GLsizei; const v: PGLdouble); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glVertexAttribs4ubvNV: procedure(index: GLuint; n: GLsizei; const v: PGLubyte); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}

function Load_GL_NV_vertex_program: Boolean;

//***** GL_NV_vertex_program1_1 *****//

function Load_GL_NV_vertex_program1_1: Boolean;

//***** GL_ATI_element_array *****//
const
  GL_ELEMENT_ARRAY_ATI = $8768;
  GL_ELEMENT_ARRAY_TYPE_ATI = $8769;
  GL_ELEMENT_ARRAY_POINTER_ATI = $876A;
var
  glElementPointerATI: procedure(_type: GLenum; const pointer: PGLvoid); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glDrawElementArrayATI: procedure(mode: GLenum; count: GLsizei); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glDrawRangeElementArrayATI: procedure(mode: GLenum; start: GLuint; _end: GLuint; count: GLsizei); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}

function Load_GL_ATI_element_array: Boolean;

//***** GL_ATI_envmap_bumpmap *****//
const
  GL_BUMP_ROT_MATRIX_ATI = $8775;
  GL_BUMP_ROT_MATRIX_SIZE_ATI = $8776;
  GL_BUMP_NUM_TEX_UNITS_ATI = $8777;
  GL_BUMP_TEX_UNITS_ATI = $8778;
  GL_DUDV_ATI = $8779;
  GL_DU8DV8_ATI = $877A;
  GL_BUMP_ENVMAP_ATI = $877B;
  GL_BUMP_TARGET_ATI = $877C;
var
  glTexBumpParameterivATI: procedure(pname: GLenum; param: PGLint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glTexBumpParameterfvATI: procedure(pname: GLenum; param: PGLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glGetTexBumpParameterivATI: procedure(pname: GLenum; param: PGLint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glGetTexBumpParameterfvATI: procedure(pname: GLenum; param: PGLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}

function Load_GL_ATI_envmap_bumpmap: Boolean;

//***** GL_ATI_fragment_shader *****//
const
  GL_FRAGMENT_SHADER_ATI = $8920;
  GL_REG_0_ATI = $8921;
  GL_REG_1_ATI = $8922;
  GL_REG_2_ATI = $8923;
  GL_REG_3_ATI = $8924;
  GL_REG_4_ATI = $8925;
  GL_REG_5_ATI = $8926;
  GL_CON_0_ATI = $8941;
  GL_CON_1_ATI = $8942;
  GL_CON_2_ATI = $8943;
  GL_CON_3_ATI = $8944;
  GL_CON_4_ATI = $8945;
  GL_CON_5_ATI = $8946;
  GL_CON_6_ATI = $8947;
  GL_CON_7_ATI = $8948;
  GL_MOV_ATI = $8961;
  GL_ADD_ATI = $8963;
  GL_MUL_ATI = $8964;
  GL_SUB_ATI = $8965;
  GL_DOT3_ATI = $8966;
  GL_DOT4_ATI = $8967;
  GL_MAD_ATI = $8968;
  GL_LERP_ATI = $8969;
  GL_CND_ATI = $896A;
  GL_CND0_ATI = $896B;
  GL_DOT2_ADD_ATI = $896C;
  GL_SECONDARY_INTERPOLATOR_ATI = $896D;
  GL_SWIZZLE_STR_ATI = $8976;
  GL_SWIZZLE_STQ_ATI = $8977;
  GL_SWIZZLE_STR_DR_ATI = $8978;
  GL_SWIZZLE_STQ_DQ_ATI = $8979;
  GL_RED_BIT_ATI = $0001;
  GL_GREEN_BIT_ATI = $0002;
  GL_BLUE_BIT_ATI = $0004;
  GL_2X_BIT_ATI = $0001;
  GL_4X_BIT_ATI = $0002;
  GL_8X_BIT_ATI = $0004;
  GL_HALF_BIT_ATI = $0008;
  GL_QUARTER_BIT_ATI = $0010;
  GL_EIGHTH_BIT_ATI = $0020;
  GL_SATURATE_BIT_ATI = $0040;
  // GL_2X_BIT_ATI  { already defined }
  GL_COMP_BIT_ATI = $0002;
  GL_NEGATE_BIT_ATI = $0004;
  GL_BIAS_BIT_ATI = $0008;
var
  glGenFragmentShadersATI: function(range: GLuint): GLuint; {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glBindFragmentShaderATI: procedure(id: GLuint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glDeleteFragmentShaderATI: procedure(id: GLuint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glBeginFragmentShaderATI: procedure(); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glEndFragmentShaderATI: procedure(); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glPassTexCoordATI: procedure(dst: GLuint; coord: GLuint; swizzle: GLenum); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glSampleMapATI: procedure(dst: GLuint; interp: GLuint; swizzle: GLenum); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glColorFragmentOp1ATI: procedure(op: GLenum; dst: GLuint; dstMask: GLuint; dstMod: GLuint; arg1: GLuint; arg1Rep: GLuint; arg1Mod: GLuint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glColorFragmentOp2ATI: procedure(op: GLenum; dst: GLuint; dstMask: GLuint; dstMod: GLuint; arg1: GLuint; arg1Rep: GLuint; arg1Mod: GLuint; arg2: GLuint; arg2Rep: GLuint; arg2Mod: GLuint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glColorFragmentOp3ATI: procedure(op: GLenum; dst: GLuint; dstMask: GLuint; dstMod: GLuint; arg1: GLuint; arg1Rep: GLuint; arg1Mod: GLuint; arg2: GLuint; arg2Rep: GLuint; arg2Mod: GLuint; arg3: GLuint; arg3Rep: GLuint; arg3Mod: GLuint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glAlphaFragmentOp1ATI: procedure(op: GLenum; dst: GLuint; dstMod: GLuint; arg1: GLuint; arg1Rep: GLuint; arg1Mod: GLuint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glAlphaFragmentOp2ATI: procedure(op: GLenum; dst: GLuint; dstMod: GLuint; arg1: GLuint; arg1Rep: GLuint; arg1Mod: GLuint; arg2: GLuint; arg2Rep: GLuint; arg2Mod: GLuint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glAlphaFragmentOp3ATI: procedure(op: GLenum; dst: GLuint; dstMod: GLuint; arg1: GLuint; arg1Rep: GLuint; arg1Mod: GLuint; arg2: GLuint; arg2Rep: GLuint; arg2Mod: GLuint; arg3: GLuint; arg3Rep: GLuint; arg3Mod: GLuint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glSetFragmentShaderConstantATI: procedure(dst: GLuint; const value: PGLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}

function Load_GL_ATI_fragment_shader: Boolean;

//***** GL_ATI_pn_triangles *****//
const
  GL_PN_TRIANGLES_ATI = $87F0;
  GL_MAX_PN_TRIANGLES_TESSELATION_LEVEL_ATI = $87F1;
  GL_PN_TRIANGLES_POINT_MODE_ATI = $87F2;
  GL_PN_TRIANGLES_NORMAL_MODE_ATI = $87F3;
  GL_PN_TRIANGLES_TESSELATION_LEVEL_ATI = $87F4;
  GL_PN_TRIANGLES_POINT_MODE_LINEAR_ATI = $87F5;
  GL_PN_TRIANGLES_POINT_MODE_CUBIC_ATI = $87F6;
  GL_PN_TRIANGLES_NORMAL_MODE_LINEAR_ATI = $87F7;
  GL_PN_TRIANGLES_NORMAL_MODE_QUADRATIC_ATI = $87F8;
var
  glPNTrianglesiATI: procedure(pname: GLenum; param: GLint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glPNTrianglesfATI: procedure(pname: GLenum; param: GLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}

function Load_GL_ATI_pn_triangles: Boolean;

//***** GL_ATI_texture_mirror_once *****//
const
  GL_MIRROR_CLAMP_ATI = $8742;
  GL_MIRROR_CLAMP_TO_EDGE_ATI = $8743;

function Load_GL_ATI_texture_mirror_once: Boolean;

//***** GL_ATI_vertex_array_object *****//
const
  GL_STATIC_ATI = $8760;
  GL_DYNAMIC_ATI = $8761;
  GL_PRESERVE_ATI = $8762;
  GL_DISCARD_ATI = $8763;
  GL_OBJECT_BUFFER_SIZE_ATI = $8764;
  GL_OBJECT_BUFFER_USAGE_ATI = $8765;
  GL_ARRAY_OBJECT_BUFFER_ATI = $8766;
  GL_ARRAY_OBJECT_OFFSET_ATI = $8767;
var
  glNewObjectBufferATI: function(size: GLsizei; const pointer: PGLvoid; usage: GLenum): GLuint; {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glIsObjectBufferATI: function(buffer: GLuint): GLboolean; {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glUpdateObjectBufferATI: procedure(buffer: GLuint; offset: GLuint; size: GLsizei; const pointer: PGLvoid; preserve: GLenum); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glGetObjectBufferfvATI: procedure(buffer: GLuint; pname: GLenum; params: PGLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glGetObjectBufferivATI: procedure(buffer: GLuint; pname: GLenum; params: PGLint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glDeleteObjectBufferATI: procedure(buffer: GLuint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glArrayObjectATI: procedure(_array: GLenum; size: GLint; _type: GLenum; stride: GLsizei; buffer: GLuint; offset: GLuint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glGetArrayObjectfvATI: procedure(_array: GLenum; pname: GLenum; params: PGLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glGetArrayObjectivATI: procedure(_array: GLenum; pname: GLenum; params: PGLint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glVariantArrayObjectATI: procedure(id: GLuint; _type: GLenum; stride: GLsizei; buffer: GLuint; offset: GLuint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glGetVariantArrayObjectfvATI: procedure(id: GLuint; pname: GLenum; params: PGLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glGetVariantArrayObjectivATI: procedure(id: GLuint; pname: GLenum; params: PGLint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}

function Load_GL_ATI_vertex_array_object: Boolean;

//***** GL_ATI_vertex_streams *****//
const
  GL_MAX_VERTEX_STREAMS_ATI = $876B;
  GL_VERTEX_STREAM0_ATI = $876C;
  GL_VERTEX_STREAM1_ATI = $876D;
  GL_VERTEX_STREAM2_ATI = $876E;
  GL_VERTEX_STREAM3_ATI = $876F;
  GL_VERTEX_STREAM4_ATI = $8770;
  GL_VERTEX_STREAM5_ATI = $8771;
  GL_VERTEX_STREAM6_ATI = $8772;
  GL_VERTEX_STREAM7_ATI = $8773;
  GL_VERTEX_SOURCE_ATI = $8774;
var
  glVertexStream1s: procedure(stream: GLenum; coords: GLshort); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glVertexStream1i: procedure(stream: GLenum; coords: GLint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glVertexStream1f: procedure(stream: GLenum; coords: GLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glVertexStream1d: procedure(stream: GLenum; coords: GLdouble); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glVertexStream1sv: procedure(stream: GLenum; coords: GLshort); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glVertexStream1iv: procedure(stream: GLenum; coords: GLint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glVertexStream1fv: procedure(stream: GLenum; coords: GLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glVertexStream1dv: procedure(stream: GLenum; coords: GLdouble); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glVertexStream2s: procedure(stream: GLenum; coords: GLshort); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glVertexStream2i: procedure(stream: GLenum; coords: GLint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glVertexStream2f: procedure(stream: GLenum; coords: GLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glVertexStream2d: procedure(stream: GLenum; coords: GLdouble); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glVertexStream2sv: procedure(stream: GLenum; coords: GLshort); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glVertexStream2iv: procedure(stream: GLenum; coords: GLint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glVertexStream2fv: procedure(stream: GLenum; coords: GLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glVertexStream2dv: procedure(stream: GLenum; coords: GLdouble); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glVertexStream3s: procedure(stream: GLenum; coords: GLshort); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glVertexStream3i: procedure(stream: GLenum; coords: GLint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glVertexStream3f: procedure(stream: GLenum; coords: GLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glVertexStream3d: procedure(stream: GLenum; coords: GLdouble); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glVertexStream3sv: procedure(stream: GLenum; coords: GLshort); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glVertexStream3iv: procedure(stream: GLenum; coords: GLint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glVertexStream3fv: procedure(stream: GLenum; coords: GLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glVertexStream3dv: procedure(stream: GLenum; coords: GLdouble); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glVertexStream4s: procedure(stream: GLenum; coords: GLshort); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glVertexStream4i: procedure(stream: GLenum; coords: GLint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glVertexStream4f: procedure(stream: GLenum; coords: GLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glVertexStream4d: procedure(stream: GLenum; coords: GLdouble); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glVertexStream4sv: procedure(stream: GLenum; coords: GLshort); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glVertexStream4iv: procedure(stream: GLenum; coords: GLint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glVertexStream4fv: procedure(stream: GLenum; coords: GLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glVertexStream4dv: procedure(stream: GLenum; coords: GLdouble); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glNormalStream3b: procedure(stream: GLenum; coords: GLbyte); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glNormalStream3s: procedure(stream: GLenum; coords: GLshort); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glNormalStream3i: procedure(stream: GLenum; coords: GLint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glNormalStream3f: procedure(stream: GLenum; coords: GLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glNormalStream3d: procedure(stream: GLenum; coords: GLdouble); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glNormalStream3bv: procedure(stream: GLenum; coords: GLbyte); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glNormalStream3sv: procedure(stream: GLenum; coords: GLshort); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glNormalStream3iv: procedure(stream: GLenum; coords: GLint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glNormalStream3fv: procedure(stream: GLenum; coords: GLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glNormalStream3dv: procedure(stream: GLenum; coords: GLdouble); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glClientActiveVertexStream: procedure(stream: GLenum); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glVertexBlendEnvi: procedure(pname: GLenum; param: GLint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glVertexBlendEnvf: procedure(pname: GLenum; param: GLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}

function Load_GL_ATI_vertex_streams: Boolean;

{$IFDEF WINDOWS}
//***** WGL_I3D_image_buffer *****//
const
  WGL_IMAGE_BUFFER_MIN_ACCESS_I3D = $0001;
  WGL_IMAGE_BUFFER_LOCK_I3D = $0002;
var
  wglCreateImageBufferI3D: function(hDC: HDC; dwSize: DWORD; uFlags: UINT): PGLvoid; {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  wglDestroyImageBufferI3D: function(hDC: HDC; pAddress: PGLvoid): BOOL; {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  wglAssociateImageBufferEventsI3D: function(hdc: HDC; pEvent: PHandle; pAddress: PGLvoid; pSize: PDWORD; count: UINT): BOOL; {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  wglReleaseImageBufferEventsI3D: function(hdc: HDC; pAddress: PGLvoid; count: UINT): BOOL; {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}

function Load_WGL_I3D_image_buffer: Boolean;

//***** WGL_I3D_swap_frame_lock *****//
var
  wglEnableFrameLockI3D: function(): BOOL; {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  wglDisableFrameLockI3D: function(): BOOL; {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  wglIsEnabledFrameLockI3D: function(pFlag: PBOOL): BOOL; {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  wglQueryFrameLockMasterI3D: function(pFlag: PBOOL): BOOL; {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}

function Load_WGL_I3D_swap_frame_lock: Boolean;

//***** WGL_I3D_swap_frame_usage *****//
var
  wglGetFrameUsageI3D: function(pUsage: PGLfloat): BOOL; {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  wglBeginFrameTrackingI3D: function(): BOOL; {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  wglEndFrameTrackingI3D: function(): BOOL; {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  wglQueryFrameTrackingI3D: function(pFrameCount: PDWORD; pMissedFrames: PDWORD; pLastMissedUsage: PGLfloat): BOOL; {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}

function Load_WGL_I3D_swap_frame_usage: Boolean;
{$ENDIF}

//***** GL_3DFX_texture_compression_FXT1 *****//
const
  GL_COMPRESSED_RGB_FXT1_3DFX = $86B0;
  GL_COMPRESSED_RGBA_FXT1_3DFX = $86B1;

function Load_GL_3DFX_texture_compression_FXT1: Boolean;

//***** GL_IBM_cull_vertex *****//
const
  GL_CULL_VERTEX_IBM = $1928A;

function Load_GL_IBM_cull_vertex: Boolean;

//***** GL_IBM_multimode_draw_arrays *****//
var
  glMultiModeDrawArraysIBM: procedure(mode: PGLenum; first: PGLint; count: PGLsizei; primcount: GLsizei; modestride: GLint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glMultiModeDrawElementsIBM: procedure(mode: PGLenum; count: PGLsizei; _type: GLenum; const indices: PGLvoid; primcount: GLsizei; modestride: GLint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}

function Load_GL_IBM_multimode_draw_arrays: Boolean;

//***** GL_IBM_raster_pos_clip *****//
const
  GL_RASTER_POSITION_UNCLIPPED_IBM = $19262;

function Load_GL_IBM_raster_pos_clip: Boolean;

//***** GL_IBM_texture_mirrored_repeat *****//
const
  GL_MIRRORED_REPEAT_IBM = $8370;

function Load_GL_IBM_texture_mirrored_repeat: Boolean;

//***** GL_IBM_vertex_array_lists *****//
const
  GL_VERTEX_ARRAY_LIST_IBM = $1929E;
  GL_NORMAL_ARRAY_LIST_IBM = $1929F;
  GL_COLOR_ARRAY_LIST_IBM = $192A0;
  GL_INDEX_ARRAY_LIST_IBM = $192A1;
  GL_TEXTURE_COORD_ARRAY_LIST_IBM = $192A2;
  GL_EDGE_FLAG_ARRAY_LIST_IBM = $192A3;
  GL_FOG_COORDINATE_ARRAY_LIST_IBM = $192A4;
  GL_SECONDARY_COLOR_ARRAY_LIST_IBM = $192A5;
  GL_VERTEX_ARRAY_LIST_STRIDE_IBM = $192A8;
  GL_NORMAL_ARRAY_LIST_STRIDE_IBM = $192A9;
  GL_COLOR_ARRAY_LIST_STRIDE_IBM = $192AA;
  GL_INDEX_ARRAY_LIST_STRIDE_IBM = $192AB;
  GL_TEXTURE_COORD_ARRAY_LIST_STRIDE_IBM = $192AC;
  GL_EDGE_FLAG_ARRAY_LIST_STRIDE_IBM = $192AD;
  GL_FOG_COORDINATE_ARRAY_LIST_STRIDE_IBM = $192AE;
  GL_SECONDARY_COLOR_ARRAY_LIST_STRIDE_IBM = $192AF;
var
  glColorPointerListIBM: procedure(size: GLint; _type: GLenum; stride: GLint; const pointer: PGLvoid; ptrstride: GLint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glSecondaryColorPointerListIBM: procedure(size: GLint; _type: GLenum; stride: GLint; const pointer: PGLvoid; ptrstride: GLint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glEdgeFlagPointerListIBM: procedure(stride: GLint; const pointer: PGLboolean; ptrstride: GLint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glFogCoordPointerListIBM: procedure(_type: GLenum; stride: GLint; const pointer: PGLvoid; ptrstride: GLint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glNormalPointerListIBM: procedure(_type: GLenum; stride: GLint; const pointer: PGLvoid; ptrstride: GLint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glTexCoordPointerListIBM: procedure(size: GLint; _type: GLenum; stride: GLint; const pointer: PGLvoid; ptrstride: GLint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glVertexPointerListIBM: procedure(size: GLint; _type: GLenum; stride: GLint; const pointer: PGLvoid; ptrstride: GLint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}

function Load_GL_IBM_vertex_array_lists: Boolean;

//***** GL_MESA_resize_buffers *****//
var
  glResizeBuffersMESA: procedure(); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}

function Load_GL_MESA_resize_buffers: Boolean;

//***** GL_MESA_window_pos *****//
var
  glWindowPos2dMESA: procedure(x: GLdouble; y: GLdouble); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glWindowPos2fMESA: procedure(x: GLfloat; y: GLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glWindowPos2iMESA: procedure(x: GLint; y: GLint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glWindowPos2sMESA: procedure(x: GLshort; y: GLshort); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glWindowPos2ivMESA: procedure(const p: PGLint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glWindowPos2svMESA: procedure(const p: PGLshort); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glWindowPos2fvMESA: procedure(const p: PGLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glWindowPos2dvMESA: procedure(const p: PGLdouble); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glWindowPos3iMESA: procedure(x: GLint; y: GLint; z: GLint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glWindowPos3sMESA: procedure(x: GLshort; y: GLshort; z: GLshort); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glWindowPos3fMESA: procedure(x: GLfloat; y: GLfloat; z: GLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glWindowPos3dMESA: procedure(x: GLdouble; y: GLdouble; z: GLdouble); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glWindowPos3ivMESA: procedure(const p: PGLint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glWindowPos3svMESA: procedure(const p: PGLshort); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glWindowPos3fvMESA: procedure(const p: PGLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glWindowPos3dvMESA: procedure(const p: PGLdouble); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glWindowPos4iMESA: procedure(x: GLint; y: GLint; z: GLint; w: GLint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glWindowPos4sMESA: procedure(x: GLshort; y: GLshort; z: GLshort; w: GLshort); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glWindowPos4fMESA: procedure(x: GLfloat; y: GLfloat; z: GLfloat; w: GLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glWindowPos4dMESA: procedure(x: GLdouble; y: GLdouble; z: GLdouble; w: GLdouble); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glWindowPos4ivMESA: procedure(const p: PGLint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glWindowPos4svMESA: procedure(const p: PGLshort); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glWindowPos4fvMESA: procedure(const p: PGLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glWindowPos4dvMESA: procedure(const p: PGLdouble); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}

function Load_GL_MESA_window_pos: Boolean;

//***** GL_OML_interlace *****//
const
  GL_INTERLACE_OML = $8980;
  GL_INTERLACE_READ_OML = $8981;

function Load_GL_OML_interlace: Boolean;

//***** GL_OML_resample *****//
const
  GL_PACK_RESAMPLE_OML = $8984;
  GL_UNPACK_RESAMPLE_OML = $8985;
  GL_RESAMPLE_REPLICATE_OML = $8986;
  GL_RESAMPLE_ZERO_FILL_OML = $8987;
  GL_RESAMPLE_AVERAGE_OML = $8988;
  GL_RESAMPLE_DECIMATE_OML = $8989;
  // GL_RESAMPLE_AVERAGE_OML  { already defined }

function Load_GL_OML_resample: Boolean;

//***** GL_OML_subsample *****//
const
  GL_FORMAT_SUBSAMPLE_24_24_OML = $8982;
  GL_FORMAT_SUBSAMPLE_244_244_OML = $8983;

function Load_GL_OML_subsample: Boolean;

//***** GL_SGIS_generate_mipmap *****//
const
  GL_GENERATE_MIPMAP_SGIS = $8191;
  GL_GENERATE_MIPMAP_HINT_SGIS = $8192;

function Load_GL_SGIS_generate_mipmap: Boolean;

//***** GL_SGIS_multisample *****//
const
  GLX_SAMPLE_BUFFERS_SGIS = $186A0;
  GLX_SAMPLES_SGIS = $186A1;
  GL_MULTISAMPLE_SGIS = $809D;
  GL_SAMPLE_ALPHA_TO_MASK_SGIS = $809E;
  GL_SAMPLE_ALPHA_TO_ONE_SGIS = $809F;
  GL_SAMPLE_MASK_SGIS = $80A0;
  GL_MULTISAMPLE_BIT_EXT = $20000000;
  GL_1PASS_SGIS = $80A1;
  GL_2PASS_0_SGIS = $80A2;
  GL_2PASS_1_SGIS = $80A3;
  GL_4PASS_0_SGIS = $80A4;
  GL_4PASS_1_SGIS = $80A5;
  GL_4PASS_2_SGIS = $80A6;
  GL_4PASS_3_SGIS = $80A7;
  GL_SAMPLE_BUFFERS_SGIS = $80A8;
  GL_SAMPLES_SGIS = $80A9;
  GL_SAMPLE_MASK_VALUE_SGIS = $80AA;
  GL_SAMPLE_MASK_INVERT_SGIS = $80AB;
  GL_SAMPLE_PATTERN_SGIS = $80AC;
var
  glSampleMaskSGIS: procedure(value: GLclampf; invert: GLboolean); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glSamplePatternSGIS: procedure(pattern: GLenum); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}

function Load_GL_SGIS_multisample: Boolean;

//***** GL_SGIS_pixel_texture *****//
const
  GL_PIXEL_TEXTURE_SGIS = $8353;
  GL_PIXEL_FRAGMENT_RGB_SOURCE_SGIS = $8354;
  GL_PIXEL_FRAGMENT_ALPHA_SOURCE_SGIS = $8355;
  GL_PIXEL_GROUP_COLOR_SGIS = $8356;
var
  glPixelTexGenParameteriSGIS: procedure(pname: GLenum; param: GLint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glPixelTexGenParameterfSGIS: procedure(pname: GLenum; param: GLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glGetPixelTexGenParameterivSGIS: procedure(pname: GLenum; params: GLint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glGetPixelTexGenParameterfvSGIS: procedure(pname: GLenum; params: GLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}

function Load_GL_SGIS_pixel_texture: Boolean;

//***** GL_SGIS_texture_border_clamp *****//
  // GL_CLAMP_TO_BORDER_SGIS  { already defined }

function Load_GL_SGIS_texture_border_clamp: Boolean;

//***** GL_SGIS_texture_color_mask *****//
const
  GL_TEXTURE_COLOR_WRITEMASK_SGIS = $81EF;
var
  glTextureColorMaskSGIS: procedure(r: GLboolean; g: GLboolean; b: GLboolean; a: GLboolean); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}

function Load_GL_SGIS_texture_color_mask: Boolean;

//***** GL_SGIS_texture_edge_clamp *****//
const
  GL_CLAMP_TO_EDGE_SGIS = $812F;

function Load_GL_SGIS_texture_edge_clamp: Boolean;

//***** GL_SGIS_texture_lod *****//
const
  GL_TEXTURE_MIN_LOD_SGIS = $813A;
  GL_TEXTURE_MAX_LOD_SGIS = $813B;
  GL_TEXTURE_BASE_LEVEL_SGIS = $813C;
  GL_TEXTURE_MAX_LEVEL_SGIS = $813D;

function Load_GL_SGIS_texture_lod: Boolean;

//***** GL_SGIS_depth_texture *****//
const
  GL_DEPTH_COMPONENT16_SGIX = $81A5;
  GL_DEPTH_COMPONENT24_SGIX = $81A6;
  GL_DEPTH_COMPONENT32_SGIX = $81A7;

function Load_GL_SGIS_depth_texture: Boolean;

//***** GL_SGIX_fog_offset *****//
const
  GL_FOG_OFFSET_SGIX = $8198;
  GL_FOG_OFFSET_VALUE_SGIX = $8199;

function Load_GL_SGIX_fog_offset: Boolean;

//***** GL_SGIX_interlace *****//
const
  GL_INTERLACE_SGIX = $8094;

function Load_GL_SGIX_interlace: Boolean;

//***** GL_SGIX_shadow_ambient *****//
const
  GL_SHADOW_AMBIENT_SGIX = $80BF;

function Load_GL_SGIX_shadow_ambient: Boolean;

//***** GL_SGI_color_matrix *****//
const
  GL_COLOR_MATRIX_SGI = $80B1;
  GL_COLOR_MATRIX_STACK_DEPTH_SGI = $80B2;
  GL_MAX_COLOR_MATRIX_STACK_DEPTH_SGI = $80B3;
  GL_POST_COLOR_MATRIX_RED_SCALE_SGI = $80B4;
  GL_POST_COLOR_MATRIX_GREEN_SCALE_SGI = $80B5;
  GL_POST_COLOR_MATRIX_BLUE_SCALE_SGI = $80B6;
  GL_POST_COLOR_MATRIX_ALPHA_SCALE_SGI = $80B7;
  GL_POST_COLOR_MATRIX_RED_BIAS_SGI = $80B8;
  GL_POST_COLOR_MATRIX_GREEN_BIAS_SGI = $80B9;
  GL_POST_COLOR_MATRIX_BLUE_BIAS_SGI = $80BA;
  GL_POST_COLOR_MATRIX_ALPHA_BIAS_SGI = $80BB;

function Load_GL_SGI_color_matrix: Boolean;

//***** GL_SGI_color_table *****//
const
  GL_COLOR_TABLE_SGI = $80D0;
  GL_POST_CONVOLUTION_COLOR_TABLE_SGI = $80D1;
  GL_POST_COLOR_MATRIX_COLOR_TABLE_SGI = $80D2;
  GL_PROXY_COLOR_TABLE_SGI = $80D3;
  GL_PROXY_POST_CONVOLUTION_COLOR_TABLE_SGI = $80D4;
  GL_PROXY_POST_COLOR_MATRIX_COLOR_TABLE_SGI = $80D5;
  GL_COLOR_TABLE_SCALE_SGI = $80D6;
  GL_COLOR_TABLE_BIAS_SGI = $80D7;
  GL_COLOR_TABLE_FORMAT_SGI = $80D8;
  GL_COLOR_TABLE_WIDTH_SGI = $80D9;
  GL_COLOR_TABLE_RED_SIZE_SGI = $80DA;
  GL_COLOR_TABLE_GREEN_SIZE_SGI = $80DB;
  GL_COLOR_TABLE_BLUE_SIZE_SGI = $80DC;
  GL_COLOR_TABLE_ALPHA_SIZE_SGI = $80DD;
  GL_COLOR_TABLE_LUMINANCE_SIZE_SGI = $80DE;
  GL_COLOR_TABLE_INTENSITY_SIZE_SGI = $80DF;
var
  glColorTableSGI: procedure(target: GLenum; internalformat: GLenum; width: GLsizei; format: GLenum; _type: GLenum; const table: PGLvoid); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glCopyColorTableSGI: procedure(target: GLenum; internalformat: GLenum; x: GLint; y: GLint; width: GLsizei); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glColorTableParameterivSGI: procedure(target: GLenum; pname: GLenum; const params: PGLint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glColorTableParameterfvSGI: procedure(target: GLenum; pname: GLenum; const params: PGLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glGetColorTableSGI: procedure(target: GLenum; format: GLenum; _type: GLenum; table: PGLvoid); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glGetColorTableParameterivSGI: procedure(target: GLenum; pname: GLenum; params: PGLint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glGetColorTableParameterfvSGI: procedure(target: GLenum; pname: GLenum; params: PGLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}

function Load_GL_SGI_color_table: Boolean;

//***** GL_SGI_texture_color_table *****//
const
  GL_TEXTURE_COLOR_TABLE_SGI = $80BC;
  GL_PROXY_TEXTURE_COLOR_TABLE_SGI = $80BD;

function Load_GL_SGI_texture_color_table: Boolean;

//***** GL_SUN_vertex *****//
var
  glColor4ubVertex2fSUN: procedure(r: GLubyte; g: GLubyte; b: GLubyte; a: GLubyte; x: GLfloat; y: GLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glColor4ubVertex2fvSUN: procedure(const c: PGLubyte; const v: PGLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glColor4ubVertex3fSUN: procedure(r: GLubyte; g: GLubyte; b: GLubyte; a: GLubyte; x: GLfloat; y: GLfloat; z: GLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glColor4ubVertex3fvSUN: procedure(const c: PGLubyte; const v: PGLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glColor3fVertex3fSUN: procedure(r: GLfloat; g: GLfloat; b: GLfloat; x: GLfloat; y: GLfloat; z: GLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glColor3fVertex3fvSUN: procedure(const c: PGLfloat; const v: PGLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glNormal3fVertex3fSUN: procedure(nx: GLfloat; ny: GLfloat; nz: GLfloat; x: GLfloat; y: GLfloat; z: GLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glNormal3fVertex3fvSUN: procedure(const n: PGLfloat; const v: PGLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glColor4fNormal3fVertex3fSUN: procedure(r: GLfloat; g: GLfloat; b: GLfloat; a: GLfloat; nx: GLfloat; ny: GLfloat; nz: GLfloat; x: GLfloat; y: GLfloat; z: GLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glColor4fNormal3fVertex3fvSUN: procedure(const c: PGLfloat; const n: PGLfloat; const v: PGLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glTexCoord2fVertex3fSUN: procedure(s: GLfloat; t: GLfloat; x: GLfloat; y: GLfloat; z: GLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glTexCoord2fVertex3fvSUN: procedure(const tc: PGLfloat; const v: PGLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glTexCoord4fVertex4fSUN: procedure(s: GLfloat; t: GLfloat; p: GLfloat; q: GLfloat; x: GLfloat; y: GLfloat; z: GLfloat; w: GLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glTexCoord4fVertex4fvSUN: procedure(const tc: PGLfloat; const v: PGLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glTexCoord2fColor4ubVertex3fSUN: procedure(s: GLfloat; t: GLfloat; r: GLubyte; g: GLubyte; b: GLubyte; a: GLubyte; x: GLfloat; y: GLfloat; z: GLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glTexCoord2fColor4ubVertex3fvSUN: procedure(const tc: PGLfloat; const c: PGLubyte; const v: PGLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glTexCoord2fColor3fVertex3fSUN: procedure(s: GLfloat; t: GLfloat; r: GLfloat; g: GLfloat; b: GLfloat; x: GLfloat; y: GLfloat; z: GLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glTexCoord2fColor3fVertex3fvSUN: procedure(const tc: PGLfloat; const c: PGLfloat; const v: PGLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glTexCoord2fNormal3fVertex3fSUN: procedure(s: GLfloat; t: GLfloat; nx: GLfloat; ny: GLfloat; nz: GLfloat; x: GLfloat; y: GLfloat; z: GLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glTexCoord2fNormal3fVertex3fvSUN: procedure(const tc: PGLfloat; const n: PGLfloat; const v: PGLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glTexCoord2fColor4fNormal3fVertex3fSUN: procedure(s: GLfloat; t: GLfloat; r: GLfloat; g: GLfloat; b: GLfloat; a: GLfloat; nx: GLfloat; ny: GLfloat; nz: GLfloat; x: GLfloat; y: GLfloat; z: GLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glTexCoord2fColor4fNormal3fVertex3fvSUN: procedure(const tc: PGLfloat; const c: PGLfloat; const n: PGLfloat; const v: PGLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glTexCoord4fColor4fNormal3fVertex4fSUN: procedure(s: GLfloat; t: GLfloat; p: GLfloat; q: GLfloat; r: GLfloat; g: GLfloat; b: GLfloat; a: GLfloat; nx: GLfloat; ny: GLfloat; nz: GLfloat; x: GLfloat; y: GLfloat; z: GLfloat; w: GLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glTexCoord4fColor4fNormal3fVertex4fvSUN: procedure(const tc: PGLfloat; const c: PGLfloat; const n: PGLfloat; const v: PGLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glReplacementCodeuiVertex3fSUN: procedure(rc: GLuint; x: GLfloat; y: GLfloat; z: GLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glReplacementCodeuiVertex3fvSUN: procedure(const rc: PGLuint; const v: PGLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glReplacementCodeuiColor4ubVertex3fSUN: procedure(rc: GLuint; r: GLubyte; g: GLubyte; b: GLubyte; a: GLubyte; x: GLfloat; y: GLfloat; z: GLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glReplacementCodeuiColor4ubVertex3fvSUN: procedure(const rc: PGLuint; const c: PGLubyte; const v: PGLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glReplacementCodeuiColor3fVertex3fSUN: procedure(rc: GLuint; r: GLfloat; g: GLfloat; b: GLfloat; x: GLfloat; y: GLfloat; z: GLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glReplacementCodeuiColor3fVertex3fvSUN: procedure(const rc: PGLuint; const c: PGLfloat; const v: PGLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glReplacementCodeuiNormal3fVertex3fSUN: procedure(rc: GLuint; nx: GLfloat; ny: GLfloat; nz: GLfloat; x: GLfloat; y: GLfloat; z: GLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glReplacementCodeuiNormal3fVertex3fvSUN: procedure(const rc: PGLuint; const n: PGLfloat; const v: PGLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glReplacementCodeuiColor4fNormal3fVertex3fSUN: procedure(rc: GLuint; r: GLfloat; g: GLfloat; b: GLfloat; a: GLfloat; nx: GLfloat; ny: GLfloat; nz: GLfloat; x: GLfloat; y: GLfloat; z: GLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glReplacementCodeuiColor4fNormal3fVertex3fvSUN: procedure(const rc: PGLuint; const c: PGLfloat; const n: PGLfloat; const v: PGLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glReplacementCodeuiTexCoord2fVertex3fSUN: procedure(rc: GLuint; s: GLfloat; t: GLfloat; x: GLfloat; y: GLfloat; z: GLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glReplacementCodeuiTexCoord2fVertex3fvSUN: procedure(const rc: PGLuint; const tc: PGLfloat; const v: PGLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glReplacementCodeuiTexCoord2fNormal3fVertex3fSUN: procedure(rc: GLuint; s: GLfloat; t: GLfloat; nx: GLfloat; ny: GLfloat; nz: GLfloat; x: GLfloat; y: GLfloat; z: GLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glReplacementCodeuiTexCoord2fNormal3fVertex3fvSUN: procedure(const rc: PGLuint; const tc: PGLfloat; const n: PGLfloat; const v: PGLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glReplacementCodeuiTexCoord2fColor4fNormal3fVertex3fSUN: procedure(rc: GLuint; s: GLfloat; t: GLfloat; r: GLfloat; g: GLfloat; b: GLfloat; a: GLfloat; nx: GLfloat; ny: GLfloat; nz: GLfloat; x: GLfloat; y: GLfloat; z: GLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glReplacementCodeuiTexCoord2fColor4fNormal3fVertex3fvSUN: procedure(const rc: PGLuint; const tc: PGLfloat; const c: PGLfloat; const n: PGLfloat; const v: PGLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}

function Load_GL_SUN_vertex: Boolean;

//***** GL_ARB_fragment_program *****//
const
  GL_FRAGMENT_PROGRAM_ARB = $8804;
  // GL_PROGRAM_FORMAT_ASCII_ARB  { already defined }
  // GL_PROGRAM_LENGTH_ARB  { already defined }
  // GL_PROGRAM_FORMAT_ARB  { already defined }
  // GL_PROGRAM_BINDING_ARB  { already defined }
  // GL_PROGRAM_INSTRUCTIONS_ARB  { already defined }
  // GL_MAX_PROGRAM_INSTRUCTIONS_ARB  { already defined }
  // GL_PROGRAM_NATIVE_INSTRUCTIONS_ARB  { already defined }
  // GL_MAX_PROGRAM_NATIVE_INSTRUCTIONS_ARB  { already defined }
  // GL_PROGRAM_TEMPORARIES_ARB  { already defined }
  // GL_MAX_PROGRAM_TEMPORARIES_ARB  { already defined }
  // GL_PROGRAM_NATIVE_TEMPORARIES_ARB  { already defined }
  // GL_MAX_PROGRAM_NATIVE_TEMPORARIES_ARB  { already defined }
  // GL_PROGRAM_PARAMETERS_ARB  { already defined }
  // GL_MAX_PROGRAM_PARAMETERS_ARB  { already defined }
  // GL_PROGRAM_NATIVE_PARAMETERS_ARB  { already defined }
  // GL_MAX_PROGRAM_NATIVE_PARAMETERS_ARB  { already defined }
  // GL_PROGRAM_ATTRIBS_ARB  { already defined }
  // GL_MAX_PROGRAM_ATTRIBS_ARB  { already defined }
  // GL_PROGRAM_NATIVE_ATTRIBS_ARB  { already defined }
  // GL_MAX_PROGRAM_NATIVE_ATTRIBS_ARB  { already defined }
  // GL_MAX_PROGRAM_LOCAL_PARAMETERS_ARB  { already defined }
  // GL_MAX_PROGRAM_ENV_PARAMETERS_ARB  { already defined }
  // GL_PROGRAM_UNDER_NATIVE_LIMITS_ARB  { already defined }
  GL_PROGRAM_ALU_INSTRUCTIONS_ARB = $8805;
  GL_PROGRAM_TEX_INSTRUCTIONS_ARB = $8806;
  GL_PROGRAM_TEX_INDIRECTIONS_ARB = $8807;
  GL_PROGRAM_NATIVE_ALU_INSTRUCTIONS_ARB = $8808;
  GL_PROGRAM_NATIVE_TEX_INSTRUCTIONS_ARB = $8809;
  GL_PROGRAM_NATIVE_TEX_INDIRECTIONS_ARB = $880A;
  GL_MAX_PROGRAM_ALU_INSTRUCTIONS_ARB = $880B;
  GL_MAX_PROGRAM_TEX_INSTRUCTIONS_ARB = $880C;
  GL_MAX_PROGRAM_TEX_INDIRECTIONS_ARB = $880D;
  GL_MAX_PROGRAM_NATIVE_ALU_INSTRUCTIONS_ARB = $880E;
  GL_MAX_PROGRAM_NATIVE_TEX_INSTRUCTIONS_ARB = $880F;
  GL_MAX_PROGRAM_NATIVE_TEX_INDIRECTIONS_ARB = $8810;
  // GL_PROGRAM_STRING_ARB  { already defined }
  // GL_PROGRAM_ERROR_POSITION_ARB  { already defined }
  // GL_CURRENT_MATRIX_ARB  { already defined }
  // GL_TRANSPOSE_CURRENT_MATRIX_ARB  { already defined }
  // GL_CURRENT_MATRIX_STACK_DEPTH_ARB  { already defined }
  // GL_MAX_PROGRAM_MATRICES_ARB  { already defined }
  // GL_MAX_PROGRAM_MATRIX_STACK_DEPTH_ARB  { already defined }
  GL_MAX_TEXTURE_COORDS_ARB = $8871;
  GL_MAX_TEXTURE_IMAGE_UNITS_ARB = $8872;
  // GL_PROGRAM_ERROR_STRING_ARB  { already defined }
  // GL_MATRIX0_ARB  { already defined }
  // GL_MATRIX1_ARB  { already defined }
  // GL_MATRIX2_ARB  { already defined }
  // GL_MATRIX3_ARB  { already defined }
  // GL_MATRIX4_ARB  { already defined }
  // GL_MATRIX5_ARB  { already defined }
  // GL_MATRIX6_ARB  { already defined }
  // GL_MATRIX7_ARB  { already defined }
  // GL_MATRIX8_ARB  { already defined }
  // GL_MATRIX9_ARB  { already defined }
  // GL_MATRIX10_ARB  { already defined }
  // GL_MATRIX11_ARB  { already defined }
  // GL_MATRIX12_ARB  { already defined }
  // GL_MATRIX13_ARB  { already defined }
  // GL_MATRIX14_ARB  { already defined }
  // GL_MATRIX15_ARB  { already defined }
  // GL_MATRIX16_ARB  { already defined }
  // GL_MATRIX17_ARB  { already defined }
  // GL_MATRIX18_ARB  { already defined }
  // GL_MATRIX19_ARB  { already defined }
  // GL_MATRIX20_ARB  { already defined }
  // GL_MATRIX21_ARB  { already defined }
  // GL_MATRIX22_ARB  { already defined }
  // GL_MATRIX23_ARB  { already defined }
  // GL_MATRIX24_ARB  { already defined }
  // GL_MATRIX25_ARB  { already defined }
  // GL_MATRIX26_ARB  { already defined }
  // GL_MATRIX27_ARB  { already defined }
  // GL_MATRIX28_ARB  { already defined }
  // GL_MATRIX29_ARB  { already defined }
  // GL_MATRIX30_ARB  { already defined }
  // GL_MATRIX31_ARB  { already defined }
  // glProgramStringARB  { already defined }
  // glBindProgramARB  { already defined }
  // glDeleteProgramsARB  { already defined }
  // glGenProgramsARB  { already defined }
  // glProgramEnvParameter4dARB  { already defined }
  // glProgramEnvParameter4dvARB  { already defined }
  // glProgramEnvParameter4fARB  { already defined }
  // glProgramEnvParameter4fvARB  { already defined }
  // glProgramLocalParameter4dARB  { already defined }
  // glProgramLocalParameter4dvARB  { already defined }
  // glProgramLocalParameter4fARB  { already defined }
  // glProgramLocalParameter4fvARB  { already defined }
  // glGetProgramEnvParameterdvARB  { already defined }
  // glGetProgramEnvParameterfvARB  { already defined }
  // glGetProgramLocalParameterdvARB  { already defined }
  // glGetProgramLocalParameterfvARB  { already defined }
  // glGetProgramivARB  { already defined }
  // glGetProgramStringARB  { already defined }
  // glIsProgramARB  { already defined }

function Load_GL_ARB_fragment_program: Boolean;

//***** GL_ATI_text_fragment_shader *****//
const
  GL_TEXT_FRAGMENT_SHADER_ATI = $8200;

function Load_GL_ATI_text_fragment_shader: Boolean;

//***** GL_APPLE_client_storage *****//
const
  GL_UNPACK_CLIENT_STORAGE_APPLE = $85B2;

function Load_GL_APPLE_client_storage: Boolean;

//***** GL_APPLE_element_array *****//
const
  GL_ELEMENT_ARRAY_APPLE = $8768;
  GL_ELEMENT_ARRAY_TYPE_APPLE = $8769;
  GL_ELEMENT_ARRAY_POINTER_APPLE = $876A;
var
  glElementPointerAPPLE: procedure(_type: GLenum; const pointer: PGLvoid); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glDrawElementArrayAPPLE: procedure(mode: GLenum; first: GLint; count: GLsizei); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glDrawRangeElementArrayAPPLE: procedure(mode: GLenum; start: GLuint; _end: GLuint; first: GLint; count: GLsizei); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glMultiDrawElementArrayAPPLE: procedure(mode: GLenum; const first: PGLint; const count: PGLsizei; primcount: GLsizei); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glMultiDrawRangeElementArrayAPPLE: procedure(mode: GLenum; start: GLuint; _end: GLuint; const first: PGLint; const count: PGLsizei; primcount: GLsizei); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}

function Load_GL_APPLE_element_array: Boolean;

//***** GL_APPLE_fence *****//
const
  GL_DRAW_PIXELS_APPLE = $8A0A;
  GL_FENCE_APPLE = $8A0B;
var
  glGenFencesAPPLE: procedure(n: GLsizei; fences: PGLuint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glDeleteFencesAPPLE: procedure(n: GLsizei; const fences: PGLuint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glSetFenceAPPLE: procedure(fence: GLuint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glIsFenceAPPLE: function(fence: GLuint): GLboolean; {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glTestFenceAPPLE: function(fence: GLuint): GLboolean; {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glFinishFenceAPPLE: procedure(fence: GLuint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glTestObjectAPPLE: function(_object: GLenum; name: GLuint): GLboolean; {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glFinishObjectAPPLE: procedure(_object: GLenum; name: GLint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}

function Load_GL_APPLE_fence: Boolean;

//***** GL_APPLE_vertex_array_object *****//
const
  GL_VERTEX_ARRAY_BINDING_APPLE = $85B5;
var
  glBindVertexArrayAPPLE: procedure(_array: GLuint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glDeleteVertexArraysAPPLE: procedure(n: GLsizei; const arrays: PGLuint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glGenVertexArraysAPPLE: procedure(n: GLsizei; const arrays: PGLuint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glIsVertexArrayAPPLE: function(_array: GLuint): GLboolean; {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}

function Load_GL_APPLE_vertex_array_object: Boolean;

//***** GL_APPLE_vertex_array_range *****//
const
  GL_VERTEX_ARRAY_RANGE_APPLE = $851D;
  GL_VERTEX_ARRAY_RANGE_LENGTH_APPLE = $851E;
  GL_MAX_VERTEX_ARRAY_RANGE_ELEMENT_APPLE = $8520;
  GL_VERTEX_ARRAY_RANGE_POINTER_APPLE = $8521;
  GL_VERTEX_ARRAY_STORAGE_HINT_APPLE = $851F;
  GL_STORAGE_CACHED_APPLE = $85BE;
  GL_STORAGE_SHARED_APPLE = $85BF;
var
  glVertexArrayRangeAPPLE: procedure(length: GLsizei; pointer: PGLvoid); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glFlushVertexArrayRangeAPPLE: procedure(length: GLsizei; pointer: PGLvoid); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glVertexArrayParameteriAPPLE: procedure(pname: GLenum; param: GLint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}

function Load_GL_APPLE_vertex_array_range: Boolean;

{$IFDEF WINDOWS}
//***** WGL_ARB_pixel_format *****//
const
  WGL_NUMBER_PIXEL_FORMATS_ARB = $2000;
  WGL_DRAW_TO_WINDOW_ARB = $2001;
  WGL_DRAW_TO_BITMAP_ARB = $2002;
  WGL_ACCELERATION_ARB = $2003;
  WGL_NEED_PALETTE_ARB = $2004;
  WGL_NEED_SYSTEM_PALETTE_ARB = $2005;
  WGL_SWAP_LAYER_BUFFERS_ARB = $2006;
  WGL_SWAP_METHOD_ARB = $2007;
  WGL_NUMBER_OVERLAYS_ARB = $2008;
  WGL_NUMBER_UNDERLAYS_ARB = $2009;
  WGL_TRANSPARENT_ARB = $200A;
  WGL_TRANSPARENT_RED_VALUE_ARB = $2037;
  WGL_TRANSPARENT_GREEN_VALUE_ARB = $2038;
  WGL_TRANSPARENT_BLUE_VALUE_ARB = $2039;
  WGL_TRANSPARENT_ALPHA_VALUE_ARB = $203A;
  WGL_TRANSPARENT_INDEX_VALUE_ARB = $203B;
  WGL_SHARE_DEPTH_ARB = $200C;
  WGL_SHARE_STENCIL_ARB = $200D;
  WGL_SHARE_ACCUM_ARB = $200E;
  WGL_SUPPORT_GDI_ARB = $200F;
  WGL_SUPPORT_OPENGL_ARB = $2010;
  WGL_DOUBLE_BUFFER_ARB = $2011;
  WGL_STEREO_ARB = $2012;
  WGL_PIXEL_TYPE_ARB = $2013;
  WGL_COLOR_BITS_ARB = $2014;
  WGL_RED_BITS_ARB = $2015;
  WGL_RED_SHIFT_ARB = $2016;
  WGL_GREEN_BITS_ARB = $2017;
  WGL_GREEN_SHIFT_ARB = $2018;
  WGL_BLUE_BITS_ARB = $2019;
  WGL_BLUE_SHIFT_ARB = $201A;
  WGL_ALPHA_BITS_ARB = $201B;
  WGL_ALPHA_SHIFT_ARB = $201C;
  WGL_ACCUM_BITS_ARB = $201D;
  WGL_ACCUM_RED_BITS_ARB = $201E;
  WGL_ACCUM_GREEN_BITS_ARB = $201F;
  WGL_ACCUM_BLUE_BITS_ARB = $2020;
  WGL_ACCUM_ALPHA_BITS_ARB = $2021;
  WGL_DEPTH_BITS_ARB = $2022;
  WGL_STENCIL_BITS_ARB = $2023;
  WGL_AUX_BUFFERS_ARB = $2024;
  WGL_NO_ACCELERATION_ARB = $2025;
  WGL_GENERIC_ACCELERATION_ARB = $2026;
  WGL_FULL_ACCELERATION_ARB = $2027;
  WGL_SWAP_EXCHANGE_ARB = $2028;
  WGL_SWAP_COPY_ARB = $2029;
  WGL_SWAP_UNDEFINED_ARB = $202A;
  WGL_TYPE_RGBA_ARB = $202B;
  WGL_TYPE_COLORINDEX_ARB = $202C;
var
  wglGetPixelFormatAttribivARB: function(hdc: HDC; iPixelFormat: GLint; iLayerPlane: GLint; nAttributes: GLuint; const piAttributes: PGLint; piValues: PGLint): BOOL; {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  wglGetPixelFormatAttribfvARB: function(hdc: HDC; iPixelFormat: GLint; iLayerPlane: GLint; nAttributes: GLuint; const piAttributes: PGLint; pfValues: PGLfloat): BOOL; {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  wglChoosePixelFormatARB: function(hdc: HDC; const piAttribIList: PGLint; const pfAttribFList: PGLfloat; nMaxFormats: GLuint; piFormats: PGLint; nNumFormats: PGLuint): BOOL; {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}

function Load_WGL_ARB_pixel_format: Boolean;

//***** WGL_ARB_make_current_read *****//
const
  WGL_ERROR_INVALID_PIXEL_TYPE_ARB = $2043;
  WGL_ERROR_INCOMPATIBLE_DEVICE_CONTEXTS_ARB = $2054;
var
  wglMakeContextCurrentARB: function(hDrawDC: HDC; hReadDC: HDC; hglrc: HGLRC): BOOL; {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  wglGetCurrentReadDCARB: function(): HDC; {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}

function Load_WGL_ARB_make_current_read: Boolean;

//***** WGL_ARB_pbuffer *****//
const
  WGL_DRAW_TO_PBUFFER_ARB = $202D;
  // WGL_DRAW_TO_PBUFFER_ARB  { already defined }
  WGL_MAX_PBUFFER_PIXELS_ARB = $202E;
  WGL_MAX_PBUFFER_WIDTH_ARB = $202F;
  WGL_MAX_PBUFFER_HEIGHT_ARB = $2030;
  WGL_PBUFFER_LARGEST_ARB = $2033;
  WGL_PBUFFER_WIDTH_ARB = $2034;
  WGL_PBUFFER_HEIGHT_ARB = $2035;
  WGL_PBUFFER_LOST_ARB = $2036;
var
  wglCreatePbufferARB: function(hDC: HDC; iPixelFormat: GLint; iWidth: GLint; iHeight: GLint; const piAttribList: PGLint): THandle; {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  wglGetPbufferDCARB: function(hPbuffer: THandle): HDC; {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  wglReleasePbufferDCARB: function(hPbuffer: THandle; hDC: HDC): GLint; {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  wglDestroyPbufferARB: function(hPbuffer: THandle): BOOL; {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  wglQueryPbufferARB: function(hPbuffer: THandle; iAttribute: GLint; piValue: PGLint): BOOL; {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}

function Load_WGL_ARB_pbuffer: Boolean;

//***** WGL_EXT_swap_control *****//
var
  wglSwapIntervalEXT: function(interval: GLint): BOOL; {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  wglGetSwapIntervalEXT: function(): GLint; {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}

function Load_WGL_EXT_swap_control: Boolean;

//***** WGL_ARB_render_texture *****//
const
  WGL_BIND_TO_TEXTURE_RGB_ARB = $2070;
  WGL_BIND_TO_TEXTURE_RGBA_ARB = $2071;
  WGL_TEXTURE_FORMAT_ARB = $2072;
  WGL_TEXTURE_TARGET_ARB = $2073;
  WGL_MIPMAP_TEXTURE_ARB = $2074;
  WGL_TEXTURE_RGB_ARB = $2075;
  WGL_TEXTURE_RGBA_ARB = $2076;
  WGL_NO_TEXTURE_ARB = $2077;
  WGL_TEXTURE_CUBE_MAP_ARB = $2078;
  WGL_TEXTURE_1D_ARB = $2079;
  WGL_TEXTURE_2D_ARB = $207A;
  // WGL_NO_TEXTURE_ARB  { already defined }
  WGL_MIPMAP_LEVEL_ARB = $207B;
  WGL_CUBE_MAP_FACE_ARB = $207C;
  WGL_TEXTURE_CUBE_MAP_POSITIVE_X_ARB = $207D;
  WGL_TEXTURE_CUBE_MAP_NEGATIVE_X_ARB = $207E;
  WGL_TEXTURE_CUBE_MAP_POSITIVE_Y_ARB = $207F;
  WGL_TEXTURE_CUBE_MAP_NEGATIVE_Y_ARB = $2080;
  WGL_TEXTURE_CUBE_MAP_POSITIVE_Z_ARB = $2081;
  WGL_TEXTURE_CUBE_MAP_NEGATIVE_Z_ARB = $2082;
  WGL_FRONT_LEFT_ARB = $2083;
  WGL_FRONT_RIGHT_ARB = $2084;
  WGL_BACK_LEFT_ARB = $2085;
  WGL_BACK_RIGHT_ARB = $2086;
  WGL_AUX0_ARB = $2087;
  WGL_AUX1_ARB = $2088;
  WGL_AUX2_ARB = $2089;
  WGL_AUX3_ARB = $208A;
  WGL_AUX4_ARB = $208B;
  WGL_AUX5_ARB = $208C;
  WGL_AUX6_ARB = $208D;
  WGL_AUX7_ARB = $208E;
  WGL_AUX8_ARB = $208F;
  WGL_AUX9_ARB = $2090;
var
  wglBindTexImageARB: function(hPbuffer: THandle; iBuffer: GLint): BOOL; {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  wglReleaseTexImageARB: function(hPbuffer: THandle; iBuffer: GLint): BOOL; {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  wglSetPbufferAttribARB: function(hPbuffer: THandle; const piAttribList: PGLint): BOOL; {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}

function Load_WGL_ARB_render_texture: Boolean;

//***** WGL_EXT_extensions_string *****//
var
  wglGetExtensionsStringEXT: function(): Pchar; {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}

function Load_WGL_EXT_extensions_string: Boolean;

//***** WGL_EXT_make_current_read *****//
var
  wglMakeContextCurrentEXT: function(hDrawDC: HDC; hReadDC: HDC; hglrc: HGLRC): BOOL; {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  wglGetCurrentReadDCEXT: function(): HDC; {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}

function Load_WGL_EXT_make_current_read: Boolean;

//***** WGL_EXT_pbuffer *****//
const
  WGL_DRAW_TO_PBUFFER_EXT = $202D;
  WGL_MAX_PBUFFER_PIXELS_EXT = $202E;
  WGL_MAX_PBUFFER_WIDTH_EXT = $202F;
  WGL_MAX_PBUFFER_HEIGHT_EXT = $2030;
  WGL_OPTIMAL_PBUFFER_WIDTH_EXT = $2031;
  WGL_OPTIMAL_PBUFFER_HEIGHT_EXT = $2032;
  WGL_PBUFFER_LARGEST_EXT = $2033;
  WGL_PBUFFER_WIDTH_EXT = $2034;
  WGL_PBUFFER_HEIGHT_EXT = $2035;
var
  wglCreatePbufferEXT: function(hDC: HDC; iPixelFormat: GLint; iWidth: GLint; iHeight: GLint; const piAttribList: PGLint): THandle; {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  wglGetPbufferDCEXT: function(hPbuffer: THandle): HDC; {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  wglReleasePbufferDCEXT: function(hPbuffer: THandle; hDC: HDC): GLint; {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  wglDestroyPbufferEXT: function(hPbuffer: THandle): BOOL; {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  wglQueryPbufferEXT: function(hPbuffer: THandle; iAttribute: GLint; piValue: PGLint): BOOL; {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}

function Load_WGL_EXT_pbuffer: Boolean;

//***** WGL_EXT_pixel_format *****//
const
  WGL_NUMBER_PIXEL_FORMATS_EXT = $2000;
  WGL_DRAW_TO_WINDOW_EXT = $2001;
  WGL_DRAW_TO_BITMAP_EXT = $2002;
  WGL_ACCELERATION_EXT = $2003;
  WGL_NEED_PALETTE_EXT = $2004;
  WGL_NEED_SYSTEM_PALETTE_EXT = $2005;
  WGL_SWAP_LAYER_BUFFERS_EXT = $2006;
  WGL_SWAP_METHOD_EXT = $2007;
  WGL_NUMBER_OVERLAYS_EXT = $2008;
  WGL_NUMBER_UNDERLAYS_EXT = $2009;
  WGL_TRANSPARENT_EXT = $200A;
  WGL_TRANSPARENT_VALUE_EXT = $200B;
  WGL_SHARE_DEPTH_EXT = $200C;
  WGL_SHARE_STENCIL_EXT = $200D;
  WGL_SHARE_ACCUM_EXT = $200E;
  WGL_SUPPORT_GDI_EXT = $200F;
  WGL_SUPPORT_OPENGL_EXT = $2010;
  WGL_DOUBLE_BUFFER_EXT = $2011;
  WGL_STEREO_EXT = $2012;
  WGL_PIXEL_TYPE_EXT = $2013;
  WGL_COLOR_BITS_EXT = $2014;
  WGL_RED_BITS_EXT = $2015;
  WGL_RED_SHIFT_EXT = $2016;
  WGL_GREEN_BITS_EXT = $2017;
  WGL_GREEN_SHIFT_EXT = $2018;
  WGL_BLUE_BITS_EXT = $2019;
  WGL_BLUE_SHIFT_EXT = $201A;
  WGL_ALPHA_BITS_EXT = $201B;
  WGL_ALPHA_SHIFT_EXT = $201C;
  WGL_ACCUM_BITS_EXT = $201D;
  WGL_ACCUM_RED_BITS_EXT = $201E;
  WGL_ACCUM_GREEN_BITS_EXT = $201F;
  WGL_ACCUM_BLUE_BITS_EXT = $2020;
  WGL_ACCUM_ALPHA_BITS_EXT = $2021;
  WGL_DEPTH_BITS_EXT = $2022;
  WGL_STENCIL_BITS_EXT = $2023;
  WGL_AUX_BUFFERS_EXT = $2024;
  WGL_NO_ACCELERATION_EXT = $2025;
  WGL_GENERIC_ACCELERATION_EXT = $2026;
  WGL_FULL_ACCELERATION_EXT = $2027;
  WGL_SWAP_EXCHANGE_EXT = $2028;
  WGL_SWAP_COPY_EXT = $2029;
  WGL_SWAP_UNDEFINED_EXT = $202A;
  WGL_TYPE_RGBA_EXT = $202B;
  WGL_TYPE_COLORINDEX_EXT = $202C;
var
  wglGetPixelFormatAttribivEXT: function(hdc: HDC; iPixelFormat: GLint; iLayerPlane: GLint; nAttributes: GLuint; piAttributes: PGLint; piValues: PGLint): BOOL; {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  wglGetPixelFormatAttribfvEXT: function(hdc: HDC; iPixelFormat: GLint; iLayerPlane: GLint; nAttributes: GLuint; piAttributes: PGLint; pfValues: PGLfloat): BOOL; {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  wglChoosePixelFormatEXT: function(hdc: HDC; const piAttribIList: PGLint; const pfAttribFList: PGLfloat; nMaxFormats: GLuint; piFormats: PGLint; nNumFormats: PGLuint): BOOL; {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}

function Load_WGL_EXT_pixel_format: Boolean;

//***** WGL_I3D_digital_video_control *****//
const
  WGL_DIGITAL_VIDEO_CURSOR_ALPHA_FRAMEBUFFER_I3D = $2050;
  WGL_DIGITAL_VIDEO_CURSOR_ALPHA_VALUE_I3D = $2051;
  WGL_DIGITAL_VIDEO_CURSOR_INCLUDED_I3D = $2052;
  WGL_DIGITAL_VIDEO_GAMMA_CORRECTED_I3D = $2053;
var
  wglGetDigitalVideoParametersI3D: function(hDC: HDC; iAttribute: GLint; piValue: PGLint): BOOL; {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  wglSetDigitalVideoParametersI3D: function(hDC: HDC; iAttribute: GLint; const piValue: PGLint): BOOL; {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}

function Load_WGL_I3D_digital_video_control: Boolean;

//***** WGL_I3D_gamma *****//
const
  WGL_GAMMA_TABLE_SIZE_I3D = $204E;
  WGL_GAMMA_EXCLUDE_DESKTOP_I3D = $204F;
  // WGL_GAMMA_EXCLUDE_DESKTOP_I3D  { already defined }
var
  wglGetGammaTableParametersI3D: function(hDC: HDC; iAttribute: GLint; piValue: PGLint): BOOL; {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  wglSetGammaTableParametersI3D: function(hDC: HDC; iAttribute: GLint; const piValue: PGLint): BOOL; {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  wglGetGammaTableI3D: function(hDC: HDC; iEntries: GLint; puRed: PGLUSHORT; puGreen: PGLUSHORT; puBlue: PGLUSHORT): BOOL; {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  wglSetGammaTableI3D: function(hDC: HDC; iEntries: GLint; const puRed: PGLUSHORT; const puGreen: PGLUSHORT; const puBlue: PGLUSHORT): BOOL; {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}

function Load_WGL_I3D_gamma: Boolean;

//***** WGL_I3D_genlock *****//
const
  WGL_GENLOCK_SOURCE_MULTIVIEW_I3D = $2044;
  WGL_GENLOCK_SOURCE_EXTERNAL_SYNC_I3D = $2045;
  WGL_GENLOCK_SOURCE_EXTERNAL_FIELD_I3D = $2046;
  WGL_GENLOCK_SOURCE_EXTERNAL_TTL_I3D = $2047;
  WGL_GENLOCK_SOURCE_DIGITAL_SYNC_I3D = $2048;
  WGL_GENLOCK_SOURCE_DIGITAL_FIELD_I3D = $2049;
  WGL_GENLOCK_SOURCE_EDGE_FALLING_I3D = $204A;
  WGL_GENLOCK_SOURCE_EDGE_RISING_I3D = $204B;
  WGL_GENLOCK_SOURCE_EDGE_BOTH_I3D = $204C;
var
  wglEnableGenlockI3D: function(hDC: HDC): BOOL; {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  wglDisableGenlockI3D: function(hDC: HDC): BOOL; {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  wglIsEnabledGenlockI3D: function(hDC: HDC; pFlag: PBOOL): BOOL; {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  wglGenlockSourceI3D: function(hDC: HDC; uSource: GLUINT): BOOL; {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  wglGetGenlockSourceI3D: function(hDC: HDC; uSource: PGLUINT): BOOL; {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  wglGenlockSourceEdgeI3D: function(hDC: HDC; uEdge: GLUINT): BOOL; {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  wglGetGenlockSourceEdgeI3D: function(hDC: HDC; uEdge: PGLUINT): BOOL; {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  wglGenlockSampleRateI3D: function(hDC: HDC; uRate: GLUINT): BOOL; {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  wglGetGenlockSampleRateI3D: function(hDC: HDC; uRate: PGLUINT): BOOL; {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  wglGenlockSourceDelayI3D: function(hDC: HDC; uDelay: GLUINT): BOOL; {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  wglGetGenlockSourceDelayI3D: function(hDC: HDC; uDelay: PGLUINT): BOOL; {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  wglQueryGenlockMaxSourceDelayI3D: function(hDC: HDC; uMaxLineDelay: PGLUINT; uMaxPixelDelay: PGLUINT): BOOL; {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}

function Load_WGL_I3D_genlock: Boolean;
{$ENDIF}

//***** GL_ARB_matrix_palette *****//
const
  GL_MATRIX_PALETTE_ARB = $8840;
  GL_MAX_MATRIX_PALETTE_STACK_DEPTH_ARB = $8841;
  GL_MAX_PALETTE_MATRICES_ARB = $8842;
  GL_CURRENT_PALETTE_MATRIX_ARB = $8843;
  GL_MATRIX_INDEX_ARRAY_ARB = $8844;
  GL_CURRENT_MATRIX_INDEX_ARB = $8845;
  GL_MATRIX_INDEX_ARRAY_SIZE_ARB = $8846;
  GL_MATRIX_INDEX_ARRAY_TYPE_ARB = $8847;
  GL_MATRIX_INDEX_ARRAY_STRIDE_ARB = $8848;
  GL_MATRIX_INDEX_ARRAY_POINTER_ARB = $8849;
var
  glCurrentPaletteMatrixARB: procedure(index: GLint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glMatrixIndexubvARB: procedure(size: GLint; indices: PGLubyte); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glMatrixIndexusvARB: procedure(size: GLint; indices: PGLushort); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glMatrixIndexuivARB: procedure(size: GLint; indices: PGLuint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glMatrixIndexPointerARB: procedure(size: GLint; _type: GLenum; stride: GLsizei; pointer: PGLvoid); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}

function Load_GL_ARB_matrix_palette: Boolean;

//***** GL_NV_element_array *****//
const
  GL_ELEMENT_ARRAY_TYPE_NV = $8769;
  GL_ELEMENT_ARRAY_POINTER_NV = $876A;
var
  glElementPointerNV: procedure(_type: GLenum; const pointer: PGLvoid); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glDrawElementArrayNV: procedure(mode: GLenum; first: GLint; count: GLsizei); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glDrawRangeElementArrayNV: procedure(mode: GLenum; start: GLuint; _end: GLuint; first: GLint; count: GLsizei); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glMultiDrawElementArrayNV: procedure(mode: GLenum; const first: PGLint; const count: PGLsizei; primcount: GLsizei); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glMultiDrawRangeElementArrayNV: procedure(mode: GLenum; start: GLuint; _end: GLuint; const first: PGLint; const count: PGLsizei; primcount: GLsizei); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}

function Load_GL_NV_element_array: Boolean;

//***** GL_NV_float_buffer *****//
const
  GL_FLOAT_R_NV = $8880;
  GL_FLOAT_RG_NV = $8881;
  GL_FLOAT_RGB_NV = $8882;
  GL_FLOAT_RGBA_NV = $8883;
  GL_FLOAT_R16_NV = $8884;
  GL_FLOAT_R32_NV = $8885;
  GL_FLOAT_RG16_NV = $8886;
  GL_FLOAT_RG32_NV = $8887;
  GL_FLOAT_RGB16_NV = $8888;
  GL_FLOAT_RGB32_NV = $8889;
  GL_FLOAT_RGBA16_NV = $888A;
  GL_FLOAT_RGBA32_NV = $888B;
  GL_TEXTURE_FLOAT_COMPONENTS_NV = $888C;
  GL_FLOAT_CLEAR_COLOR_VALUE_NV = $888D;
  GL_FLOAT_RGBA_MODE_NV = $888E;
{$IFDEF WINDOWS}
  WGL_FLOAT_COMPONENTS_NV = $20B0;
  WGL_BIND_TO_TEXTURE_RECTANGLE_FLOAT_R_NV = $20B1;
  WGL_BIND_TO_TEXTURE_RECTANGLE_FLOAT_RG_NV = $20B2;
  WGL_BIND_TO_TEXTURE_RECTANGLE_FLOAT_RGB_NV = $20B3;
  WGL_BIND_TO_TEXTURE_RECTANGLE_FLOAT_RGBA_NV = $20B4;
  WGL_TEXTURE_FLOAT_R_NV = $20B5;
  WGL_TEXTURE_FLOAT_RG_NV = $20B6;
  WGL_TEXTURE_FLOAT_RGB_NV = $20B7;
  WGL_TEXTURE_FLOAT_RGBA_NV = $20B8;
{$ENDIF}

function Load_GL_NV_float_buffer: Boolean;

//***** GL_NV_fragment_program *****//
const
  GL_FRAGMENT_PROGRAM_NV = $8870;
  GL_MAX_TEXTURE_COORDS_NV = $8871;
  GL_MAX_TEXTURE_IMAGE_UNITS_NV = $8872;
  GL_FRAGMENT_PROGRAM_BINDING_NV = $8873;
  GL_MAX_FRAGMENT_PROGRAM_LOCAL_PARAMETERS_NV = $8868;
  GL_PROGRAM_ERROR_STRING_NV = $8874;
var
  glProgramNamedParameter4fNV: procedure(id: GLuint; len: GLsizei; const name: PGLubyte; x: GLfloat; y: GLfloat; z: GLfloat; w: GLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glProgramNamedParameter4dNV: procedure(id: GLuint; len: GLsizei; const name: PGLubyte; x: GLdouble; y: GLdouble; z: GLdouble; w: GLdouble); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glGetProgramNamedParameterfvNV: procedure(id: GLuint; len: GLsizei; const name: PGLubyte; params: PGLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glGetProgramNamedParameterdvNV: procedure(id: GLuint; len: GLsizei; const name: PGLubyte; params: PGLdouble); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  // glProgramLocalParameter4dARB  { already defined }
  // glProgramLocalParameter4dvARB  { already defined }
  // glProgramLocalParameter4fARB  { already defined }
  // glProgramLocalParameter4fvARB  { already defined }
  // glGetProgramLocalParameterdvARB  { already defined }
  // glGetProgramLocalParameterfvARB  { already defined }

function Load_GL_NV_fragment_program: Boolean;

//***** GL_NV_primitive_restart *****//
const
  GL_PRIMITIVE_RESTART_NV = $8558;
  GL_PRIMITIVE_RESTART_INDEX_NV = $8559;
var
  glPrimitiveRestartNV: procedure(); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glPrimitiveRestartIndexNV: procedure(index: GLuint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}

function Load_GL_NV_primitive_restart: Boolean;

//***** GL_NV_vertex_program2 *****//

function Load_GL_NV_vertex_program2: Boolean;

{$IFDEF WINDOWS}
//***** WGL_NV_render_texture_rectangle *****//
const
  WGL_BIND_TO_TEXTURE_RECTANGLE_RGB_NV = $20A0;
  WGL_BIND_TO_TEXTURE_RECTANGLE_RGBA_NV = $20A1;
  WGL_TEXTURE_RECTANGLE_NV = $20A2;

function Load_WGL_NV_render_texture_rectangle: Boolean;
{$ENDIF}

//***** GL_NV_pixel_data_range *****//
const
  GL_WRITE_PIXEL_DATA_RANGE_NV = $8878;
  GL_READ_PIXEL_DATA_RANGE_NV = $8879;
  GL_WRITE_PIXEL_DATA_RANGE_LENGTH_NV = $887A;
  GL_READ_PIXEL_DATA_RANGE_LENGTH_NV = $887B;
  GL_WRITE_PIXEL_DATA_RANGE_POINTER_NV = $887C;
  GL_READ_PIXEL_DATA_RANGE_POINTER_NV = $887D;
var
  glPixelDataRangeNV: procedure(target: GLenum; length: GLsizei; pointer: PGLvoid); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glFlushPixelDataRangeNV: procedure(target: GLenum); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  // wglAllocateMemoryNV  { already defined }
  // wglFreeMemoryNV  { already defined }

function Load_GL_NV_pixel_data_range: Boolean;

//***** GL_EXT_texture_rectangle *****//
const
  GL_TEXTURE_RECTANGLE_EXT = $84F5;
  GL_TEXTURE_BINDING_RECTANGLE_EXT = $84F6;
  GL_PROXY_TEXTURE_RECTANGLE_EXT = $84F7;
  GL_MAX_RECTANGLE_TEXTURE_SIZE_EXT = $84F8;

function Load_GL_EXT_texture_rectangle: Boolean;

//***** GL_S3_s3tc *****//
const
  GL_RGB_S3TC = $83A0;
  GL_RGB4_S3TC = $83A1;
  GL_RGBA_S3TC = $83A2;
  GL_RGBA4_S3TC = $83A3;

function Load_GL_S3_s3tc: Boolean;

//***** GL_ATI_draw_buffers *****//
const
  GL_MAX_DRAW_BUFFERS_ATI = $8824;
  GL_DRAW_BUFFER0_ATI = $8825;
  GL_DRAW_BUFFER1_ATI = $8826;
  GL_DRAW_BUFFER2_ATI = $8827;
  GL_DRAW_BUFFER3_ATI = $8828;
  GL_DRAW_BUFFER4_ATI = $8829;
  GL_DRAW_BUFFER5_ATI = $882A;
  GL_DRAW_BUFFER6_ATI = $882B;
  GL_DRAW_BUFFER7_ATI = $882C;
  GL_DRAW_BUFFER8_ATI = $882D;
  GL_DRAW_BUFFER9_ATI = $882E;
  GL_DRAW_BUFFER10_ATI = $882F;
  GL_DRAW_BUFFER11_ATI = $8830;
  GL_DRAW_BUFFER12_ATI = $8831;
  GL_DRAW_BUFFER13_ATI = $8832;
  GL_DRAW_BUFFER14_ATI = $8833;
  GL_DRAW_BUFFER15_ATI = $8834;
var
  glDrawBuffersATI: procedure(n: GLsizei; const bufs: PGLenum); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}

function Load_GL_ATI_draw_buffers: Boolean;

{$IFDEF WINDOWS}
//***** WGL_ATI_pixel_format_float *****//
const
  WGL_RGBA_FLOAT_MODE_ATI = $8820;
  WGL_COLOR_CLEAR_UNCLAMPED_VALUE_ATI = $8835;
  WGL_TYPE_RGBA_FLOAT_ATI = $21A0;

function Load_WGL_ATI_pixel_format_float: Boolean;
{$ENDIF}

//***** GL_ATI_texture_env_combine3 *****//
const
  GL_MODULATE_ADD_ATI = $8744;
  GL_MODULATE_SIGNED_ADD_ATI = $8745;
  GL_MODULATE_SUBTRACT_ATI = $8746;

function Load_GL_ATI_texture_env_combine3: Boolean;

//***** GL_ATI_texture_float *****//
const
  GL_RGBA_FLOAT32_ATI = $8814;
  GL_RGB_FLOAT32_ATI = $8815;
  GL_ALPHA_FLOAT32_ATI = $8816;
  GL_INTENSITY_FLOAT32_ATI = $8817;
  GL_LUMINANCE_FLOAT32_ATI = $8818;
  GL_LUMINANCE_ALPHA_FLOAT32_ATI = $8819;
  GL_RGBA_FLOAT16_ATI = $881A;
  GL_RGB_FLOAT16_ATI = $881B;
  GL_ALPHA_FLOAT16_ATI = $881C;
  GL_INTENSITY_FLOAT16_ATI = $881D;
  GL_LUMINANCE_FLOAT16_ATI = $881E;
  GL_LUMINANCE_ALPHA_FLOAT16_ATI = $881F;

function Load_GL_ATI_texture_float: Boolean;

//***** GL_NV_texture_expand_normal *****//
const
  GL_TEXTURE_UNSIGNED_REMAP_MODE_NV = $888F;

function Load_GL_NV_texture_expand_normal: Boolean;

//***** GL_NV_half_float *****//
const
  GL_HALF_FLOAT_NV = $140B;
var
  glVertex2hNV: procedure(x: GLushort; y: GLushort); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glVertex2hvNV: procedure(const v: PGLushort); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glVertex3hNV: procedure(x: GLushort; y: GLushort; z: GLushort); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glVertex3hvNV: procedure(const v: PGLushort); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glVertex4hNV: procedure(x: GLushort; y: GLushort; z: GLushort; w: GLushort); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glVertex4hvNV: procedure(const v: PGLushort); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glNormal3hNV: procedure(nx: GLushort; ny: GLushort; nz: GLushort); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glNormal3hvNV: procedure(const v: PGLushort); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glColor3hNV: procedure(red: GLushort; green: GLushort; blue: GLushort); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glColor3hvNV: procedure(const v: PGLushort); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glColor4hNV: procedure(red: GLushort; green: GLushort; blue: GLushort; alpha: GLushort); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glColor4hvNV: procedure(const v: PGLushort); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glTexCoord1hNV: procedure(s: GLushort); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glTexCoord1hvNV: procedure(const v: PGLushort); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glTexCoord2hNV: procedure(s: GLushort; t: GLushort); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glTexCoord2hvNV: procedure(const v: PGLushort); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glTexCoord3hNV: procedure(s: GLushort; t: GLushort; r: GLushort); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glTexCoord3hvNV: procedure(const v: PGLushort); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glTexCoord4hNV: procedure(s: GLushort; t: GLushort; r: GLushort; q: GLushort); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glTexCoord4hvNV: procedure(const v: PGLushort); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glMultiTexCoord1hNV: procedure(target: GLenum; s: GLushort); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glMultiTexCoord1hvNV: procedure(target: GLenum; const v: PGLushort); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glMultiTexCoord2hNV: procedure(target: GLenum; s: GLushort; t: GLushort); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glMultiTexCoord2hvNV: procedure(target: GLenum; const v: PGLushort); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glMultiTexCoord3hNV: procedure(target: GLenum; s: GLushort; t: GLushort; r: GLushort); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glMultiTexCoord3hvNV: procedure(target: GLenum; const v: PGLushort); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glMultiTexCoord4hNV: procedure(target: GLenum; s: GLushort; t: GLushort; r: GLushort; q: GLushort); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glMultiTexCoord4hvNV: procedure(target: GLenum; const v: PGLushort); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glFogCoordhNV: procedure(fog: GLushort); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glFogCoordhvNV: procedure(const fog: PGLushort); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glSecondaryColor3hNV: procedure(red: GLushort; green: GLushort; blue: GLushort); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glSecondaryColor3hvNV: procedure(const v: PGLushort); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glVertexWeighthNV: procedure(weight: GLushort); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glVertexWeighthvNV: procedure(const weight: PGLushort); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glVertexAttrib1hNV: procedure(index: GLuint; x: GLushort); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glVertexAttrib1hvNV: procedure(index: GLuint; const v: PGLushort); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glVertexAttrib2hNV: procedure(index: GLuint; x: GLushort; y: GLushort); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glVertexAttrib2hvNV: procedure(index: GLuint; const v: PGLushort); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glVertexAttrib3hNV: procedure(index: GLuint; x: GLushort; y: GLushort; z: GLushort); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glVertexAttrib3hvNV: procedure(index: GLuint; const v: PGLushort); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glVertexAttrib4hNV: procedure(index: GLuint; x: GLushort; y: GLushort; z: GLushort; w: GLushort); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glVertexAttrib4hvNV: procedure(index: GLuint; const v: PGLushort); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glVertexAttribs1hvNV: procedure(index: GLuint; n: GLsizei; const v: PGLushort); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glVertexAttribs2hvNV: procedure(index: GLuint; n: GLsizei; const v: PGLushort); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glVertexAttribs3hvNV: procedure(index: GLuint; n: GLsizei; const v: PGLushort); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glVertexAttribs4hvNV: procedure(index: GLuint; n: GLsizei; const v: PGLushort); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}

function Load_GL_NV_half_float: Boolean;

//***** GL_ATI_map_object_buffer *****//
var
  glMapObjectBufferATI: function(buffer: GLuint): PGLvoid; {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glUnmapObjectBufferATI: procedure(buffer: GLuint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}

function Load_GL_ATI_map_object_buffer: Boolean;

//***** GL_ATI_separate_stencil *****//
const
  GL_KEEP = $1E00;
  GL_ZERO = $0000;
  GL_REPLACE = $1E01;
  GL_INCR = $1E02;
  GL_DECR = $1E03;
  GL_INVERT = $150A;
  GL_NEVER = $0200;
  GL_LESS = $0201;
  GL_LEQUAL = $0203;
  GL_GREATER = $0204;
  GL_GEQUAL = $0206;
  GL_EQUAL = $0202;
  GL_NOTEQUAL = $0205;
  GL_ALWAYS = $0207;
  GL_FRONT = $0404;
  GL_BACK = $0405;
  GL_FRONT_AND_BACK = $0408;
  GL_STENCIL_BACK_FUNC_ATI = $8800;
  GL_STENCIL_BACK_FAIL_ATI = $8801;
  GL_STENCIL_BACK_PASS_DEPTH_FAIL_ATI = $8802;
  GL_STENCIL_BACK_PASS_DEPTH_PASS_ATI = $8803;
var
  glStencilOpSeparateATI: procedure(face: GLenum; sfail: GLenum; dpfail: GLenum; dppass: GLenum); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glStencilFuncSeparateATI: procedure(frontfunc: GLenum; backfunc: GLenum; ref: GLint; mask: GLuint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}

function Load_GL_ATI_separate_stencil: Boolean;

//***** GL_ATI_vertex_attrib_array_object *****//
var
  glVertexAttribArrayObjectATI: procedure(index: GLuint; size: GLint; _type: GLenum; normalized: GLboolean; stride: GLsizei; buffer: GLuint; offset: GLuint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glGetVertexAttribArrayObjectfvATI: procedure(index: GLuint; pname: GLenum; params: PGLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glGetVertexAttribArrayObjectivATI: procedure(index: GLuint; pname: GLenum; params: PGLint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}

function Load_GL_ATI_vertex_attrib_array_object: Boolean;

//***** GL_ARB_vertex_buffer_object *****//
const
  GL_ARRAY_BUFFER_ARB = $8892;
  GL_ELEMENT_ARRAY_BUFFER_ARB = $8893;
  GL_ARRAY_BUFFER_BINDING_ARB = $8894;
  GL_ELEMENT_ARRAY_BUFFER_BINDING_ARB = $8895;
  GL_VERTEX_ARRAY_BUFFER_BINDING_ARB = $8896;
  GL_NORMAL_ARRAY_BUFFER_BINDING_ARB = $8897;
  GL_COLOR_ARRAY_BUFFER_BINDING_ARB = $8898;
  GL_INDEX_ARRAY_BUFFER_BINDING_ARB = $8899;
  GL_TEXTURE_COORD_ARRAY_BUFFER_BINDING_ARB = $889A;
  GL_EDGE_FLAG_ARRAY_BUFFER_BINDING_ARB = $889B;
  GL_SECONDARY_COLOR_ARRAY_BUFFER_BINDING_ARB = $889C;
  GL_FOG_COORDINATE_ARRAY_BUFFER_BINDING_ARB = $889D;
  GL_WEIGHT_ARRAY_BUFFER_BINDING_ARB = $889E;
  GL_VERTEX_ATTRIB_ARRAY_BUFFER_BINDING_ARB = $889F;
  GL_STREAM_DRAW_ARB = $88E0;
  GL_STREAM_READ_ARB = $88E1;
  GL_STREAM_COPY_ARB = $88E2;
  GL_STATIC_DRAW_ARB = $88E4;
  GL_STATIC_READ_ARB = $88E5;
  GL_STATIC_COPY_ARB = $88E6;
  GL_DYNAMIC_DRAW_ARB = $88E8;
  GL_DYNAMIC_READ_ARB = $88E9;
  GL_DYNAMIC_COPY_ARB = $88EA;
  GL_READ_ONLY_ARB = $88B8;
  GL_WRITE_ONLY_ARB = $88B9;
  GL_READ_WRITE_ARB = $88BA;
  GL_BUFFER_SIZE_ARB = $8764;
  GL_BUFFER_USAGE_ARB = $8765;
  GL_BUFFER_ACCESS_ARB = $88BB;
  GL_BUFFER_MAPPED_ARB = $88BC;
  GL_BUFFER_MAP_POINTER_ARB = $88BD;
var
  glBindBufferARB: procedure(target: GLenum; buffer: GLuint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glDeleteBuffersARB: procedure(n: GLsizei; const buffers: PGLuint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glGenBuffersARB: procedure(n: GLsizei; buffers: PGLuint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glIsBufferARB: function(buffer: GLuint): GLboolean; {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glBufferDataARB: procedure(target: GLenum; size: GLsizeiptrARB; const data: PGLvoid; usage: GLenum); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glBufferSubDataARB: procedure(target: GLenum; offset: GLintptrARB; size: GLsizeiptrARB; const data: PGLvoid); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glGetBufferSubDataARB: procedure(target: GLenum; offset: GLintptrARB; size: GLsizeiptrARB; data: PGLvoid); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glMapBufferARB: function(target: GLenum; access: GLenum): PGLvoid; {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glUnmapBufferARB: function(target: GLenum): GLboolean; {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glGetBufferParameterivARB: procedure(target: GLenum; pname: GLenum; params: PGLint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glGetBufferPointervARB: procedure(target: GLenum; pname: GLenum; params: PGLvoid); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}

function Load_GL_ARB_vertex_buffer_object: Boolean;

//***** GL_ARB_occlusion_query *****//
const
  GL_SAMPLES_PASSED_ARB = $8914;
  GL_QUERY_COUNTER_BITS_ARB = $8864;
  GL_CURRENT_QUERY_ARB = $8865;
  GL_QUERY_RESULT_ARB = $8866;
  GL_QUERY_RESULT_AVAILABLE_ARB = $8867;
var
  glGenQueriesARB: procedure(n: GLsizei; ids: PGLuint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glDeleteQueriesARB: procedure(n: GLsizei; const ids: PGLuint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glIsQueryARB: function(id: GLuint): GLboolean; {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glBeginQueryARB: procedure(target: GLenum; id: GLuint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glEndQueryARB: procedure(target: GLenum); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glGetQueryivARB: procedure(target: GLenum; pname: GLenum; params: PGLint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glGetQueryObjectivARB: procedure(id: GLuint; pname: GLenum; params: PGLint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glGetQueryObjectuivARB: procedure(id: GLuint; pname: GLenum; params: PGLuint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}

function Load_GL_ARB_occlusion_query: Boolean;

//***** GL_ARB_shader_objects *****//
const
  GL_PROGRAM_OBJECT_ARB = $8B40;
  GL_OBJECT_TYPE_ARB = $8B4E;
  GL_OBJECT_SUBTYPE_ARB = $8B4F;
  GL_OBJECT_DELETE_STATUS_ARB = $8B80;
  GL_OBJECT_COMPILE_STATUS_ARB = $8B81;
  GL_OBJECT_LINK_STATUS_ARB = $8B82;
  GL_OBJECT_VALIDATE_STATUS_ARB = $8B83;
  GL_OBJECT_INFO_LOG_LENGTH_ARB = $8B84;
  GL_OBJECT_ATTACHED_OBJECTS_ARB = $8B85;
  GL_OBJECT_ACTIVE_UNIFORMS_ARB = $8B86;
  GL_OBJECT_ACTIVE_UNIFORM_MAX_LENGTH_ARB = $8B87;
  GL_OBJECT_SHADER_SOURCE_LENGTH_ARB = $8B88;
  GL_SHADER_OBJECT_ARB = $8B48;
  GL_FLOAT = $1406;
  GL_FLOAT_VEC2_ARB = $8B50;
  GL_FLOAT_VEC3_ARB = $8B51;
  GL_FLOAT_VEC4_ARB = $8B52;
  GL_INT = $1404;
  GL_INT_VEC2_ARB = $8B53;
  GL_INT_VEC3_ARB = $8B54;
  GL_INT_VEC4_ARB = $8B55;
  GL_BOOL_ARB = $8B56;
  GL_BOOL_VEC2_ARB = $8B57;
  GL_BOOL_VEC3_ARB = $8B58;
  GL_BOOL_VEC4_ARB = $8B59;
  GL_FLOAT_MAT2_ARB = $8B5A;
  GL_FLOAT_MAT3_ARB = $8B5B;
  GL_FLOAT_MAT4_ARB = $8B5C;
var
  glDeleteObjectARB: procedure(obj: GLhandleARB); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glGetHandleARB: function(pname: GLenum): GLhandleARB; {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glDetachObjectARB: procedure(containerObj: GLhandleARB; attachedObj: GLhandleARB); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glCreateShaderObjectARB: function(shaderType: GLenum): GLhandleARB; {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glShaderSourceARB: procedure(shaderObj: GLhandleARB; count: GLsizei; const _string: PGLvoid; const length: PGLint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glCompileShaderARB: procedure(shaderObj: GLhandleARB); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glCreateProgramObjectARB: function(): GLhandleARB; {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glAttachObjectARB: procedure(containerObj: GLhandleARB; obj: GLhandleARB); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glLinkProgramARB: procedure(programObj: GLhandleARB); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glUseProgramObjectARB: procedure(programObj: GLhandleARB); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glValidateProgramARB: procedure(programObj: GLhandleARB); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glUniform1fARB: procedure(location: GLint; v0: GLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glUniform2fARB: procedure(location: GLint; v0: GLfloat; v1: GLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glUniform3fARB: procedure(location: GLint; v0: GLfloat; v1: GLfloat; v2: GLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glUniform4fARB: procedure(location: GLint; v0: GLfloat; v1: GLfloat; v2: GLfloat; v3: GLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glUniform1iARB: procedure(location: GLint; v0: GLint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glUniform2iARB: procedure(location: GLint; v0: GLint; v1: GLint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glUniform3iARB: procedure(location: GLint; v0: GLint; v1: GLint; v2: GLint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glUniform4iARB: procedure(location: GLint; v0: GLint; v1: GLint; v2: GLint; v3: GLint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glUniform1fvARB: procedure(location: GLint; count: GLsizei; value: PGLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glUniform2fvARB: procedure(location: GLint; count: GLsizei; value: PGLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glUniform3fvARB: procedure(location: GLint; count: GLsizei; value: PGLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glUniform4fvARB: procedure(location: GLint; count: GLsizei; value: PGLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glUniform1ivARB: procedure(location: GLint; count: GLsizei; value: PGLint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glUniform2ivARB: procedure(location: GLint; count: GLsizei; value: PGLint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glUniform3ivARB: procedure(location: GLint; count: GLsizei; value: PGLint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glUniform4ivARB: procedure(location: GLint; count: GLsizei; value: PGLint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glUniformMatrix2fvARB: procedure(location: GLint; count: GLsizei; transpose: GLboolean; value: PGLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glUniformMatrix3fvARB: procedure(location: GLint; count: GLsizei; transpose: GLboolean; value: PGLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glUniformMatrix4fvARB: procedure(location: GLint; count: GLsizei; transpose: GLboolean; value: PGLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glGetObjectParameterfvARB: procedure(obj: GLhandleARB; pname: GLenum; params: PGLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glGetObjectParameterivARB: procedure(obj: GLhandleARB; pname: GLenum; params: PGLint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glGetInfoLogARB: procedure(obj: GLhandleARB; maxLength: GLsizei; length: PGLsizei; infoLog: PGLcharARB); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glGetAttachedObjectsARB: procedure(containerObj: GLhandleARB; maxCount: GLsizei; count: PGLsizei; obj: PGLhandleARB); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glGetUniformLocationARB: function(programObj: GLhandleARB; const name: PGLcharARB): GLint; {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glGetActiveUniformARB: procedure(programObj: GLhandleARB; index: GLuint; maxLength: GLsizei; length: PGLsizei; size: PGLint; _type: PGLenum; name: PGLcharARB); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glGetUniformfvARB: procedure(programObj: GLhandleARB; location: GLint; params: PGLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glGetUniformivARB: procedure(programObj: GLhandleARB; location: GLint; params: PGLint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glGetShaderSourceARB: procedure(obj: GLhandleARB; maxLength: GLsizei; length: PGLsizei; source: PGLcharARB); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}

function Load_GL_ARB_shader_objects: Boolean;

//***** GL_ARB_vertex_shader *****//
const
  GL_VERTEX_SHADER_ARB = $8B31;
  GL_MAX_VERTEX_UNIFORM_COMPONENTS_ARB = $8B4A;
  GL_MAX_VARYING_FLOATS_ARB = $8B4B;
  // GL_MAX_VERTEX_ATTRIBS_ARB  { already defined }
  // GL_MAX_TEXTURE_IMAGE_UNITS_ARB  { already defined }
  GL_MAX_VERTEX_TEXTURE_IMAGE_UNITS_ARB = $8B4C;
  GL_MAX_COMBINED_TEXTURE_IMAGE_UNITS_ARB = $8B4D;
  // GL_MAX_TEXTURE_COORDS_ARB  { already defined }
  // GL_VERTEX_PROGRAM_POINT_SIZE_ARB  { already defined }
  // GL_VERTEX_PROGRAM_TWO_SIDE_ARB  { already defined }
  // GL_OBJECT_TYPE_ARB  { already defined }
  // GL_OBJECT_SUBTYPE_ARB  { already defined }
  GL_OBJECT_ACTIVE_ATTRIBUTES_ARB = $8B89;
  GL_OBJECT_ACTIVE_ATTRIBUTE_MAX_LENGTH_ARB = $8B8A;
  // GL_SHADER_OBJECT_ARB  { already defined }
  // GL_VERTEX_ATTRIB_ARRAY_ENABLED_ARB  { already defined }
  // GL_VERTEX_ATTRIB_ARRAY_SIZE_ARB  { already defined }
  // GL_VERTEX_ATTRIB_ARRAY_STRIDE_ARB  { already defined }
  // GL_VERTEX_ATTRIB_ARRAY_TYPE_ARB  { already defined }
  // GL_VERTEX_ATTRIB_ARRAY_NORMALIZED_ARB  { already defined }
  // GL_CURRENT_VERTEX_ATTRIB_ARB  { already defined }
  // GL_VERTEX_ATTRIB_ARRAY_POINTER_ARB  { already defined }
  // GL_FLOAT  { already defined }
  // GL_FLOAT_VEC2_ARB  { already defined }
  // GL_FLOAT_VEC3_ARB  { already defined }
  // GL_FLOAT_VEC4_ARB  { already defined }
  // GL_FLOAT_MAT2_ARB  { already defined }
  // GL_FLOAT_MAT3_ARB  { already defined }
  // GL_FLOAT_MAT4_ARB  { already defined }
  // glVertexAttrib1fARB  { already defined }
  // glVertexAttrib1sARB  { already defined }
  // glVertexAttrib1dARB  { already defined }
  // glVertexAttrib2fARB  { already defined }
  // glVertexAttrib2sARB  { already defined }
  // glVertexAttrib2dARB  { already defined }
  // glVertexAttrib3fARB  { already defined }
  // glVertexAttrib3sARB  { already defined }
  // glVertexAttrib3dARB  { already defined }
  // glVertexAttrib4fARB  { already defined }
  // glVertexAttrib4sARB  { already defined }
  // glVertexAttrib4dARB  { already defined }
  // glVertexAttrib4NubARB  { already defined }
  // glVertexAttrib1fvARB  { already defined }
  // glVertexAttrib1svARB  { already defined }
  // glVertexAttrib1dvARB  { already defined }
  // glVertexAttrib2fvARB  { already defined }
  // glVertexAttrib2svARB  { already defined }
  // glVertexAttrib2dvARB  { already defined }
  // glVertexAttrib3fvARB  { already defined }
  // glVertexAttrib3svARB  { already defined }
  // glVertexAttrib3dvARB  { already defined }
  // glVertexAttrib4fvARB  { already defined }
  // glVertexAttrib4svARB  { already defined }
  // glVertexAttrib4dvARB  { already defined }
  // glVertexAttrib4ivARB  { already defined }
  // glVertexAttrib4bvARB  { already defined }
  // glVertexAttrib4ubvARB  { already defined }
  // glVertexAttrib4usvARB  { already defined }
  // glVertexAttrib4uivARB  { already defined }
  // glVertexAttrib4NbvARB  { already defined }
  // glVertexAttrib4NsvARB  { already defined }
  // glVertexAttrib4NivARB  { already defined }
  // glVertexAttrib4NubvARB  { already defined }
  // glVertexAttrib4NusvARB  { already defined }
  // glVertexAttrib4NuivARB  { already defined }
  // glVertexAttribPointerARB  { already defined }
  // glEnableVertexAttribArrayARB  { already defined }
  // glDisableVertexAttribArrayARB  { already defined }
var
  glBindAttribLocationARB: procedure(programObj: GLhandleARB; index: GLuint; const name: PGLcharARB); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glGetActiveAttribARB: procedure(programObj: GLhandleARB; index: GLuint; maxLength: GLsizei; length: PGLsizei; size: PGLint; _type: PGLenum; name: PGLcharARB); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glGetAttribLocationARB: function(programObj: GLhandleARB; const name: PGLcharARB): GLint; {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  // glGetVertexAttribdvARB  { already defined }
  // glGetVertexAttribfvARB  { already defined }
  // glGetVertexAttribivARB  { already defined }
  // glGetVertexAttribPointervARB  { already defined }

function Load_GL_ARB_vertex_shader: Boolean;

//***** GL_ARB_fragment_shader *****//
const
  GL_FRAGMENT_SHADER_ARB = $8B30;
  GL_MAX_FRAGMENT_UNIFORM_COMPONENTS_ARB = $8B49;
  // GL_MAX_TEXTURE_COORDS_ARB  { already defined }
  // GL_MAX_TEXTURE_IMAGE_UNITS_ARB  { already defined }
  // GL_OBJECT_TYPE_ARB  { already defined }
  // GL_OBJECT_SUBTYPE_ARB  { already defined }
  // GL_SHADER_OBJECT_ARB  { already defined }

function Load_GL_ARB_fragment_shader: Boolean;

//***** GL_ARB_shading_language_100 *****//

function Load_GL_ARB_shading_language_100: Boolean;

//***** GL_ARB_texture_non_power_of_two *****//

function Load_GL_ARB_texture_non_power_of_two: Boolean;

//***** GL_ARB_point_sprite *****//
const
  GL_POINT_SPRITE_ARB = $8861;
  GL_COORD_REPLACE_ARB = $8862;

function Load_GL_ARB_point_sprite: Boolean;

//***** GL_EXT_depth_bounds_test *****//
const
  GL_DEPTH_BOUNDS_TEST_EXT = $8890;
  GL_DEPTH_BOUNDS_EXT = $8891;
var
  glDepthBoundsEXT: procedure(zmin: GLclampd; zmax: GLclampd); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}

function Load_GL_EXT_depth_bounds_test: Boolean;

//***** GL_EXT_secondary_color *****//
const
  GL_COLOR_SUM_EXT = $8458;
  GL_CURRENT_SECONDARY_COLOR_EXT = $8459;
  GL_SECONDARY_COLOR_ARRAY_SIZE_EXT = $845A;
  GL_SECONDARY_COLOR_ARRAY_TYPE_EXT = $845B;
  GL_SECONDARY_COLOR_ARRAY_STRIDE_EXT = $845C;
  GL_SECONDARY_COLOR_ARRAY_POINTER_EXT = $845D;
  GL_SECONDARY_COLOR_ARRAY_EXT = $845E;
var
  glSecondaryColor3bEXT: procedure(r: GLbyte; g: GLbyte; b: GLbyte); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glSecondaryColor3sEXT: procedure(r: GLshort; g: GLshort; b: GLshort); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glSecondaryColor3iEXT: procedure(r: GLint; g: GLint; b: GLint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glSecondaryColor3fEXT: procedure(r: GLfloat; g: GLfloat; b: GLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glSecondaryColor3dEXT: procedure(r: GLdouble; g: GLdouble; b: GLdouble); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glSecondaryColor3ubEXT: procedure(r: GLubyte; g: GLubyte; b: GLubyte); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glSecondaryColor3usEXT: procedure(r: GLushort; g: GLushort; b: GLushort); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glSecondaryColor3uiEXT: procedure(r: GLuint; g: GLuint; b: GLuint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glSecondaryColor3bvEXT: procedure(components: PGLbyte); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glSecondaryColor3svEXT: procedure(components: PGLshort); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glSecondaryColor3ivEXT: procedure(components: PGLint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glSecondaryColor3fvEXT: procedure(components: PGLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glSecondaryColor3dvEXT: procedure(components: PGLdouble); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glSecondaryColor3ubvEXT: procedure(components: PGLubyte); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glSecondaryColor3usvEXT: procedure(components: PGLushort); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glSecondaryColor3uivEXT: procedure(components: PGLuint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glSecondaryColorPointerEXT: procedure(size: GLint; _type: GLenum; stride: GLsizei; pointer: PGLvoid); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}

function Load_GL_EXT_secondary_color: Boolean;

//***** GL_EXT_texture_mirror_clamp *****//
const
  GL_MIRROR_CLAMP_EXT = $8742;
  GL_MIRROR_CLAMP_TO_EDGE_EXT = $8743;
  GL_MIRROR_CLAMP_TO_BORDER_EXT = $8912;

function Load_GL_EXT_texture_mirror_clamp: Boolean;

//***** GL_EXT_blend_equation_separate *****//
const
  GL_BLEND_EQUATION_RGB_EXT = $8009;
  GL_BLEND_EQUATION_ALPHA_EXT = $883D;
var
  glBlendEquationSeparateEXT: procedure(modeRGB: GLenum; modeAlpha: GLenum); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}

function Load_GL_EXT_blend_equation_separate: Boolean;

//***** GL_MESA_pack_invert *****//
const
  GL_PACK_INVERT_MESA = $8758;

function Load_GL_MESA_pack_invert: Boolean;

//***** GL_MESA_ycbcr_texture *****//
const
  GL_YCBCR_MESA = $8757;
  GL_UNSIGNED_SHORT_8_8_MESA = $85BA;
  GL_UNSIGNED_SHORT_8_8_REV_MESA = $85BB;

function Load_GL_MESA_ycbcr_texture: Boolean;

//***** GL_ARB_fragment_program_shadow *****//

function Load_GL_ARB_fragment_program_shadow: Boolean;

//***** GL_EXT_fog_coord *****//
const
  GL_FOG_COORDINATE_SOURCE_EXT = $8450;
  GL_FOG_COORDINATE_EXT = $8451;
  GL_FRAGMENT_DEPTH_EXT = $8452;
  GL_CURRENT_FOG_COORDINATE_EXT = $8453;
  GL_FOG_COORDINATE_ARRAY_TYPE_EXT = $8454;
  GL_FOG_COORDINATE_ARRAY_STRIDE_EXT = $8455;
  GL_FOG_COORDINATE_ARRAY_POINTER_EXT = $8456;
  GL_FOG_COORDINATE_ARRAY_EXT = $8457;
var
  glFogCoordfEXT: procedure(coord: GLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glFogCoorddEXT: procedure(coord: GLdouble); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glFogCoordfvEXT: procedure(coord: PGLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glFogCoorddvEXT: procedure(coord: PGLdouble); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glFogCoordPointerEXT: procedure(_type: GLenum; stride: GLsizei; pointer: PGLvoid); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}

function Load_GL_EXT_fog_coord: Boolean;

//***** GL_NV_fragment_program_option *****//

function Load_GL_NV_fragment_program_option: Boolean;

//***** GL_EXT_pixel_buffer_object *****//
const
  GL_PIXEL_PACK_BUFFER_EXT = $88EB;
  GL_PIXEL_UNPACK_BUFFER_EXT = $88EC;
  GL_PIXEL_PACK_BUFFER_BINDING_EXT = $88ED;
  GL_PIXEL_UNPACK_BUFFER_BINDING_EXT = $88EF;

function Load_GL_EXT_pixel_buffer_object: Boolean;

//***** GL_NV_fragment_program2 *****//
const
  GL_MAX_PROGRAM_EXEC_INSTRUCTIONS_NV = $88F4;
  GL_MAX_PROGRAM_CALL_DEPTH_NV = $88F5;
  GL_MAX_PROGRAM_IF_DEPTH_NV = $88F6;
  GL_MAX_PROGRAM_LOOP_DEPTH_NV = $88F7;
  GL_MAX_PROGRAM_LOOP_COUNT_NV = $88F8;

function Load_GL_NV_fragment_program2: Boolean;

//***** GL_NV_vertex_program2_option *****//
  // GL_MAX_PROGRAM_EXEC_INSTRUCTIONS_NV  { already defined }
  // GL_MAX_PROGRAM_CALL_DEPTH_NV  { already defined }

function Load_GL_NV_vertex_program2_option: Boolean;

//***** GL_NV_vertex_program3 *****//
  // GL_MAX_VERTEX_TEXTURE_IMAGE_UNITS_ARB  { already defined }

function Load_GL_NV_vertex_program3: Boolean;

//***** GL_ARB_draw_buffers *****//
const
  GL_MAX_DRAW_BUFFERS_ARB = $8824;
  GL_DRAW_BUFFER0_ARB = $8825;
  GL_DRAW_BUFFER1_ARB = $8826;
  GL_DRAW_BUFFER2_ARB = $8827;
  GL_DRAW_BUFFER3_ARB = $8828;
  GL_DRAW_BUFFER4_ARB = $8829;
  GL_DRAW_BUFFER5_ARB = $882A;
  GL_DRAW_BUFFER6_ARB = $882B;
  GL_DRAW_BUFFER7_ARB = $882C;
  GL_DRAW_BUFFER8_ARB = $882D;
  GL_DRAW_BUFFER9_ARB = $882E;
  GL_DRAW_BUFFER10_ARB = $882F;
  GL_DRAW_BUFFER11_ARB = $8830;
  GL_DRAW_BUFFER12_ARB = $8831;
  GL_DRAW_BUFFER13_ARB = $8832;
  GL_DRAW_BUFFER14_ARB = $8833;
  GL_DRAW_BUFFER15_ARB = $8834;
var
  glDrawBuffersARB: procedure(n: GLsizei; const bufs: PGLenum); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}

function Load_GL_ARB_draw_buffers: Boolean;

//***** GL_ARB_texture_rectangle *****//
const
  GL_TEXTURE_RECTANGLE_ARB = $84F5;
  GL_TEXTURE_BINDING_RECTANGLE_ARB = $84F6;
  GL_PROXY_TEXTURE_RECTANGLE_ARB = $84F7;
  GL_MAX_RECTANGLE_TEXTURE_SIZE_ARB = $84F8;

function Load_GL_ARB_texture_rectangle: Boolean;

//***** GL_ARB_color_buffer_float *****//
const
  GL_RGBA_FLOAT_MODE_ARB = $8820;
  GL_CLAMP_VERTEX_COLOR_ARB = $891A;
  GL_CLAMP_FRAGMENT_COLOR_ARB = $891B;
  GL_CLAMP_READ_COLOR_ARB = $891C;
  GL_FIXED_ONLY_ARB = $891D;
  WGL_TYPE_RGBA_FLOAT_ARB = $21A0;
var
  glClampColorARB: procedure(target: GLenum; clamp: GLenum); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}

function Load_GL_ARB_color_buffer_float: Boolean;

//***** GL_ARB_half_float_pixel *****//
const
  GL_HALF_FLOAT_ARB = $140B;

function Load_GL_ARB_half_float_pixel: Boolean;

//***** GL_ARB_texture_float *****//
const
  GL_TEXTURE_RED_TYPE_ARB = $8C10;
  GL_TEXTURE_GREEN_TYPE_ARB = $8C11;
  GL_TEXTURE_BLUE_TYPE_ARB = $8C12;
  GL_TEXTURE_ALPHA_TYPE_ARB = $8C13;
  GL_TEXTURE_LUMINANCE_TYPE_ARB = $8C14;
  GL_TEXTURE_INTENSITY_TYPE_ARB = $8C15;
  GL_TEXTURE_DEPTH_TYPE_ARB = $8C16;
  GL_UNSIGNED_NORMALIZED_ARB = $8C17;
  GL_RGBA32F_ARB = $8814;
  GL_RGB32F_ARB = $8815;
  GL_ALPHA32F_ARB = $8816;
  GL_INTENSITY32F_ARB = $8817;
  GL_LUMINANCE32F_ARB = $8818;
  GL_LUMINANCE_ALPHA32F_ARB = $8819;
  GL_RGBA16F_ARB = $881A;
  GL_RGB16F_ARB = $881B;
  GL_ALPHA16F_ARB = $881C;
  GL_INTENSITY16F_ARB = $881D;
  GL_LUMINANCE16F_ARB = $881E;
  GL_LUMINANCE_ALPHA16F_ARB = $881F;

function Load_GL_ARB_texture_float: Boolean;

//***** GL_EXT_texture_compression_dxt1 *****//
  // GL_COMPRESSED_RGB_S3TC_DXT1_EXT  { already defined }
  // GL_COMPRESSED_RGBA_S3TC_DXT1_EXT  { already defined }

function Load_GL_EXT_texture_compression_dxt1: Boolean;

//***** GL_ARB_pixel_buffer_object *****//
const
  GL_PIXEL_PACK_BUFFER_ARB = $88EB;
  GL_PIXEL_UNPACK_BUFFER_ARB = $88EC;
  GL_PIXEL_PACK_BUFFER_BINDING_ARB = $88ED;
  GL_PIXEL_UNPACK_BUFFER_BINDING_ARB = $88EF;

function Load_GL_ARB_pixel_buffer_object: Boolean;

//***** GL_EXT_framebuffer_object *****//
const
  GL_FRAMEBUFFER_EXT = $8D40;
  GL_RENDERBUFFER_EXT = $8D41;
  GL_STENCIL_INDEX_EXT = $8D45;
  GL_STENCIL_INDEX1_EXT = $8D46;
  GL_STENCIL_INDEX4_EXT = $8D47;
  GL_STENCIL_INDEX8_EXT = $8D48;
  GL_STENCIL_INDEX16_EXT = $8D49;
  GL_RENDERBUFFER_WIDTH_EXT = $8D42;
  GL_RENDERBUFFER_HEIGHT_EXT = $8D43;
  GL_RENDERBUFFER_INTERNAL_FORMAT_EXT = $8D44;
  GL_FRAMEBUFFER_ATTACHMENT_OBJECT_TYPE_EXT = $8CD0;
  GL_FRAMEBUFFER_ATTACHMENT_OBJECT_NAME_EXT = $8CD1;
  GL_FRAMEBUFFER_ATTACHMENT_TEXTURE_LEVEL_EXT = $8CD2;
  GL_FRAMEBUFFER_ATTACHMENT_TEXTURE_CUBE_MAP_FACE_EXT = $8CD3;
  GL_FRAMEBUFFER_ATTACHMENT_TEXTURE_3D_ZOFFSET_EXT = $8CD4;
  GL_COLOR_ATTACHMENT0_EXT = $8CE0;
  GL_COLOR_ATTACHMENT1_EXT = $8CE1;
  GL_COLOR_ATTACHMENT2_EXT = $8CE2;
  GL_COLOR_ATTACHMENT3_EXT = $8CE3;
  GL_COLOR_ATTACHMENT4_EXT = $8CE4;
  GL_COLOR_ATTACHMENT5_EXT = $8CE5;
  GL_COLOR_ATTACHMENT6_EXT = $8CE6;
  GL_COLOR_ATTACHMENT7_EXT = $8CE7;
  GL_COLOR_ATTACHMENT8_EXT = $8CE8;
  GL_COLOR_ATTACHMENT9_EXT = $8CE9;
  GL_COLOR_ATTACHMENT10_EXT = $8CEA;
  GL_COLOR_ATTACHMENT11_EXT = $8CEB;
  GL_COLOR_ATTACHMENT12_EXT = $8CEC;
  GL_COLOR_ATTACHMENT13_EXT = $8CED;
  GL_COLOR_ATTACHMENT14_EXT = $8CEE;
  GL_COLOR_ATTACHMENT15_EXT = $8CEF;
  GL_DEPTH_ATTACHMENT_EXT = $8D00;
  GL_STENCIL_ATTACHMENT_EXT = $8D20;
  GL_FRAMEBUFFER_COMPLETE_EXT = $8CD5;
  GL_FRAMEBUFFER_INCOMPLETE_ATTACHMENT_EXT = $8CD6;
  GL_FRAMEBUFFER_INCOMPLETE_MISSING_ATTACHMENT_EXT = $8CD7;
  GL_FRAMEBUFFER_INCOMPLETE_DUPLICATE_ATTACHMENT_EXT = $8CD8;
  GL_FRAMEBUFFER_INCOMPLETE_DIMENSIONS_EXT = $8CD9;
  GL_FRAMEBUFFER_INCOMPLETE_FORMATS_EXT = $8CDA;
  GL_FRAMEBUFFER_INCOMPLETE_DRAW_BUFFER_EXT = $8CDB;
  GL_FRAMEBUFFER_INCOMPLETE_READ_BUFFER_EXT = $8CDC;
  GL_FRAMEBUFFER_UNSUPPORTED_EXT = $8CDD;
  GL_FRAMEBUFFER_STATUS_ERROR_EXT = $8CDE;
  GL_FRAMEBUFFER_BINDING_EXT = $8CA6;
  GL_RENDERBUFFER_BINDING_EXT = $8CA7;
  GL_MAX_COLOR_ATTACHMENTS_EXT = $8CDF;
  GL_MAX_RENDERBUFFER_SIZE_EXT = $84E8;
  GL_INVALID_FRAMEBUFFER_OPERATION_EXT = $0506;
var
  glIsRenderbufferEXT: function(renderbuffer: GLuint): GLboolean; {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glBindRenderbufferEXT: procedure(target: GLenum; renderbuffer: GLuint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glDeleteRenderbuffersEXT: procedure(n: GLsizei; const renderbuffers: PGLuint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glGenRenderbuffersEXT: procedure(n: GLsizei; renderbuffers: PGLuint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glRenderbufferStorageEXT: procedure(target: GLenum; internalformat: GLenum; width: GLsizei; height: GLsizei); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glGetRenderbufferParameterivEXT: procedure(target: GLenum; pname: GLenum; params: PGLint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glIsFramebufferEXT: function(framebuffer: GLuint): GLboolean; {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glBindFramebufferEXT: procedure(target: GLenum; framebuffer: GLuint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glDeleteFramebuffersEXT: procedure(n: GLsizei; const framebuffers: PGLuint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glGenFramebuffersEXT: procedure(n: GLsizei; framebuffers: PGLuint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glCheckFramebufferStatusEXT: function(target: GLenum): GLenum; {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glFramebufferTexture1DEXT: procedure(target: GLenum; attachment: GLenum; textarget: GLenum; texture: GLuint; level: GLint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glFramebufferTexture2DEXT: procedure(target: GLenum; attachment: GLenum; textarget: GLenum; texture: GLuint; level: GLint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glFramebufferTexture3DEXT: procedure(target: GLenum; attachment: GLenum; textarget: GLenum; texture: GLuint; level: GLint; zoffset: GLint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glFramebufferRenderbufferEXT: procedure(target: GLenum; attachment: GLenum; renderbuffertarget: GLenum; renderbuffer: GLuint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glGetFramebufferAttachmentParameterivEXT: procedure(target: GLenum; attachment: GLenum; pname: GLenum; params: PGLint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glGenerateMipmapEXT: procedure(target: GLenum); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}

function Load_GL_EXT_framebuffer_object: Boolean;

//***** GL_version_1_4 *****//
const
  GL_BLEND_DST_RGB = $80C8;
  GL_BLEND_SRC_RGB = $80C9;
  GL_BLEND_DST_ALPHA = $80CA;
  GL_BLEND_SRC_ALPHA = $80CB;
  GL_POINT_SIZE_MIN = $8126;
  GL_POINT_SIZE_MAX = $8127;
  GL_POINT_FADE_THRESHOLD_SIZE = $8128;
  GL_POINT_DISTANCE_ATTENUATION = $8129;
  GL_GENERATE_MIPMAP = $8191;
  GL_GENERATE_MIPMAP_HINT = $8192;
  GL_DEPTH_COMPONENT16 = $81A5;
  GL_DEPTH_COMPONENT24 = $81A6;
  GL_DEPTH_COMPONENT32 = $81A7;
  GL_MIRRORED_REPEAT = $8370;
  GL_FOG_COORDINATE_SOURCE = $8450;
  GL_FOG_COORDINATE = $8451;
  GL_FRAGMENT_DEPTH = $8452;
  GL_CURRENT_FOG_COORDINATE = $8453;
  GL_FOG_COORDINATE_ARRAY_TYPE = $8454;
  GL_FOG_COORDINATE_ARRAY_STRIDE = $8455;
  GL_FOG_COORDINATE_ARRAY_POINTER = $8456;
  GL_FOG_COORDINATE_ARRAY = $8457;
  GL_COLOR_SUM = $8458;
  GL_CURRENT_SECONDARY_COLOR = $8459;
  GL_SECONDARY_COLOR_ARRAY_SIZE = $845A;
  GL_SECONDARY_COLOR_ARRAY_TYPE = $845B;
  GL_SECONDARY_COLOR_ARRAY_STRIDE = $845C;
  GL_SECONDARY_COLOR_ARRAY_POINTER = $845D;
  GL_SECONDARY_COLOR_ARRAY = $845E;
  GL_MAX_TEXTURE_LOD_BIAS = $84FD;
  GL_TEXTURE_FILTER_CONTROL = $8500;
  GL_TEXTURE_LOD_BIAS = $8501;
  GL_INCR_WRAP = $8507;
  GL_DECR_WRAP = $8508;
  GL_TEXTURE_DEPTH_SIZE = $884A;
  GL_DEPTH_TEXTURE_MODE = $884B;
  GL_TEXTURE_COMPARE_MODE = $884C;
  GL_TEXTURE_COMPARE_FUNC = $884D;
  GL_COMPARE_R_TO_TEXTURE = $884E;
var
  glBlendFuncSeparate: procedure(sfactorRGB: GLenum; dfactorRGB: GLenum; sfactorAlpha: GLenum; dfactorAlpha: GLenum); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glFogCoordf: procedure(coord: GLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glFogCoordfv: procedure(const coord: PGLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glFogCoordd: procedure(coord: GLdouble); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glFogCoorddv: procedure(const coord: PGLdouble); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glFogCoordPointer: procedure(_type: GLenum; stride: GLsizei; const pointer: PGLvoid); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glMultiDrawArrays: procedure(mode: GLenum; first: PGLint; count: PGLsizei; primcount: GLsizei); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glMultiDrawElements: procedure(mode: GLenum; const count: PGLsizei; _type: GLenum; const indices: PGLvoid; primcount: GLsizei); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glPointParameterf: procedure(pname: GLenum; param: GLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glPointParameterfv: procedure(pname: GLenum; const params: PGLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glPointParameteri: procedure(pname: GLenum; param: GLint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glPointParameteriv: procedure(pname: GLenum; const params: PGLint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glSecondaryColor3b: procedure(red: GLbyte; green: GLbyte; blue: GLbyte); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glSecondaryColor3bv: procedure(const v: PGLbyte); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glSecondaryColor3d: procedure(red: GLdouble; green: GLdouble; blue: GLdouble); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glSecondaryColor3dv: procedure(const v: PGLdouble); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glSecondaryColor3f: procedure(red: GLfloat; green: GLfloat; blue: GLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glSecondaryColor3fv: procedure(const v: PGLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glSecondaryColor3i: procedure(red: GLint; green: GLint; blue: GLint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glSecondaryColor3iv: procedure(const v: PGLint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glSecondaryColor3s: procedure(red: GLshort; green: GLshort; blue: GLshort); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glSecondaryColor3sv: procedure(const v: PGLshort); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glSecondaryColor3ub: procedure(red: GLubyte; green: GLubyte; blue: GLubyte); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glSecondaryColor3ubv: procedure(const v: PGLubyte); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glSecondaryColor3ui: procedure(red: GLuint; green: GLuint; blue: GLuint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glSecondaryColor3uiv: procedure(const v: PGLuint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glSecondaryColor3us: procedure(red: GLushort; green: GLushort; blue: GLushort); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glSecondaryColor3usv: procedure(const v: PGLushort); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glSecondaryColorPointer: procedure(size: GLint; _type: GLenum; stride: GLsizei; const pointer: PGLvoid); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glWindowPos2d: procedure(x: GLdouble; y: GLdouble); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glWindowPos2dv: procedure(const v: PGLdouble); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glWindowPos2f: procedure(x: GLfloat; y: GLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glWindowPos2fv: procedure(const v: PGLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glWindowPos2i: procedure(x: GLint; y: GLint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glWindowPos2iv: procedure(const v: PGLint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glWindowPos2s: procedure(x: GLshort; y: GLshort); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glWindowPos2sv: procedure(const v: PGLshort); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glWindowPos3d: procedure(x: GLdouble; y: GLdouble; z: GLdouble); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glWindowPos3dv: procedure(const v: PGLdouble); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glWindowPos3f: procedure(x: GLfloat; y: GLfloat; z: GLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glWindowPos3fv: procedure(const v: PGLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glWindowPos3i: procedure(x: GLint; y: GLint; z: GLint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glWindowPos3iv: procedure(const v: PGLint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glWindowPos3s: procedure(x: GLshort; y: GLshort; z: GLshort); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glWindowPos3sv: procedure(const v: PGLshort); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}

function Load_GL_version_1_4: Boolean;

//***** GL_version_1_5 *****//
const
  GL_BUFFER_SIZE = $8764;
  GL_BUFFER_USAGE = $8765;
  GL_QUERY_COUNTER_BITS = $8864;
  GL_CURRENT_QUERY = $8865;
  GL_QUERY_RESULT = $8866;
  GL_QUERY_RESULT_AVAILABLE = $8867;
  GL_ARRAY_BUFFER = $8892;
  GL_ELEMENT_ARRAY_BUFFER = $8893;
  GL_ARRAY_BUFFER_BINDING = $8894;
  GL_ELEMENT_ARRAY_BUFFER_BINDING = $8895;
  GL_VERTEX_ARRAY_BUFFER_BINDING = $8896;
  GL_NORMAL_ARRAY_BUFFER_BINDING = $8897;
  GL_COLOR_ARRAY_BUFFER_BINDING = $8898;
  GL_INDEX_ARRAY_BUFFER_BINDING = $8899;
  GL_TEXTURE_COORD_ARRAY_BUFFER_BINDING = $889A;
  GL_EDGE_FLAG_ARRAY_BUFFER_BINDING = $889B;
  GL_SECONDARY_COLOR_ARRAY_BUFFER_BINDING = $889C;
  GL_FOG_COORDINATE_ARRAY_BUFFER_BINDING = $889D;
  GL_WEIGHT_ARRAY_BUFFER_BINDING = $889E;
  GL_VERTEX_ATTRIB_ARRAY_BUFFER_BINDING = $889F;
  GL_READ_ONLY = $88B8;
  GL_WRITE_ONLY = $88B9;
  GL_READ_WRITE = $88BA;
  GL_BUFFER_ACCESS = $88BB;
  GL_BUFFER_MAPPED = $88BC;
  GL_BUFFER_MAP_POINTER = $88BD;
  GL_STREAM_DRAW = $88E0;
  GL_STREAM_READ = $88E1;
  GL_STREAM_COPY = $88E2;
  GL_STATIC_DRAW = $88E4;
  GL_STATIC_READ = $88E5;
  GL_STATIC_COPY = $88E6;
  GL_DYNAMIC_DRAW = $88E8;
  GL_DYNAMIC_READ = $88E9;
  GL_DYNAMIC_COPY = $88EA;
  GL_SAMPLES_PASSED = $8914;
  GL_FOG_COORD_SRC = $8450;
  GL_FOG_COORD = $8451;
  GL_CURRENT_FOG_COORD = $8453;
  GL_FOG_COORD_ARRAY_TYPE = $8454;
  GL_FOG_COORD_ARRAY_STRIDE = $8455;
  GL_FOG_COORD_ARRAY_POINTER = $8456;
  GL_FOG_COORD_ARRAY = $8457;
  GL_FOG_COORD_ARRAY_BUFFER_BINDING = $889D;
  GL_SRC0_RGB = $8580;
  GL_SRC1_RGB = $8581;
  GL_SRC2_RGB = $8582;
  GL_SRC0_ALPHA = $8588;
  GL_SRC1_ALPHA = $8589;
  GL_SRC2_ALPHA = $858A;
var
  glGenQueries: procedure(n: GLsizei; ids: PGLuint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glDeleteQueries: procedure(n: GLsizei; const ids: PGLuint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glIsQuery: function(id: GLuint): GLboolean; {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glBeginQuery: procedure(target: GLenum; id: GLuint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glEndQuery: procedure(target: GLenum); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glGetQueryiv: procedure(target: GLenum; pname: GLenum; params: PGLint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glGetQueryObjectiv: procedure(id: GLuint; pname: GLenum; params: PGLint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glGetQueryObjectuiv: procedure(id: GLuint; pname: GLenum; params: PGLuint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glBindBuffer: procedure(target: GLenum; buffer: GLuint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glDeleteBuffers: procedure(n: GLsizei; const buffers: PGLuint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glGenBuffers: procedure(n: GLsizei; buffers: PGLuint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glIsBuffer: function(buffer: GLuint): GLboolean; {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glBufferData: procedure(target: GLenum; size: GLsizeiptr; const data: PGLvoid; usage: GLenum); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glBufferSubData: procedure(target: GLenum; offset: GLintptr; size: GLsizeiptr; const data: PGLvoid); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glGetBufferSubData: procedure(target: GLenum; offset: GLintptr; size: GLsizeiptr; data: PGLvoid); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glMapBuffer: function(target: GLenum; access: GLenum): PGLvoid; {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glUnmapBuffer: function(target: GLenum): GLboolean; {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glGetBufferParameteriv: procedure(target: GLenum; pname: GLenum; params: PGLint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glGetBufferPointerv: procedure(target: GLenum; pname: GLenum; params: PGLvoid); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}

function Load_GL_version_1_5: Boolean;

//***** GL_version_2_0 *****//
const
  GL_BLEND_EQUATION_RGB = $8009;
  GL_VERTEX_ATTRIB_ARRAY_ENABLED = $8622;
  GL_VERTEX_ATTRIB_ARRAY_SIZE = $8623;
  GL_VERTEX_ATTRIB_ARRAY_STRIDE = $8624;
  GL_VERTEX_ATTRIB_ARRAY_TYPE = $8625;
  GL_CURRENT_VERTEX_ATTRIB = $8626;
  GL_VERTEX_PROGRAM_POINT_SIZE = $8642;
  GL_VERTEX_PROGRAM_TWO_SIDE = $8643;
  GL_VERTEX_ATTRIB_ARRAY_POINTER = $8645;
  GL_STENCIL_BACK_FUNC = $8800;
  GL_STENCIL_BACK_FAIL = $8801;
  GL_STENCIL_BACK_PASS_DEPTH_FAIL = $8802;
  GL_STENCIL_BACK_PASS_DEPTH_PASS = $8803;
  GL_MAX_DRAW_BUFFERS = $8824;
  GL_DRAW_BUFFER0 = $8825;
  GL_DRAW_BUFFER1 = $8826;
  GL_DRAW_BUFFER2 = $8827;
  GL_DRAW_BUFFER3 = $8828;
  GL_DRAW_BUFFER4 = $8829;
  GL_DRAW_BUFFER5 = $882A;
  GL_DRAW_BUFFER6 = $882B;
  GL_DRAW_BUFFER7 = $882C;
  GL_DRAW_BUFFER8 = $882D;
  GL_DRAW_BUFFER9 = $882E;
  GL_DRAW_BUFFER10 = $882F;
  GL_DRAW_BUFFER11 = $8830;
  GL_DRAW_BUFFER12 = $8831;
  GL_DRAW_BUFFER13 = $8832;
  GL_DRAW_BUFFER14 = $8833;
  GL_DRAW_BUFFER15 = $8834;
  GL_BLEND_EQUATION_ALPHA = $883D;
  GL_POINT_SPRITE = $8861;
  GL_COORD_REPLACE = $8862;
  GL_MAX_VERTEX_ATTRIBS = $8869;
  GL_VERTEX_ATTRIB_ARRAY_NORMALIZED = $886A;
  GL_MAX_TEXTURE_COORDS = $8871;
  GL_MAX_TEXTURE_IMAGE_UNITS = $8872;
  GL_FRAGMENT_SHADER = $8B30;
  GL_VERTEX_SHADER = $8B31;
  GL_MAX_FRAGMENT_UNIFORM_COMPONENTS = $8B49;
  GL_MAX_VERTEX_UNIFORM_COMPONENTS = $8B4A;
  GL_MAX_VARYING_FLOATS = $8B4B;
  GL_MAX_VERTEX_TEXTURE_IMAGE_UNITS = $8B4C;
  GL_MAX_COMBINED_TEXTURE_IMAGE_UNITS = $8B4D;
  GL_SHADER_TYPE = $8B4F;
  GL_FLOAT_VEC2 = $8B50;
  GL_FLOAT_VEC3 = $8B51;
  GL_FLOAT_VEC4 = $8B52;
  GL_INT_VEC2 = $8B53;
  GL_INT_VEC3 = $8B54;
  GL_INT_VEC4 = $8B55;
  GL_BOOL = $8B56;
  GL_BOOL_VEC2 = $8B57;
  GL_BOOL_VEC3 = $8B58;
  GL_BOOL_VEC4 = $8B59;
  GL_FLOAT_MAT2 = $8B5A;
  GL_FLOAT_MAT3 = $8B5B;
  GL_FLOAT_MAT4 = $8B5C;
  GL_SAMPLER_1D = $8B5D;
  GL_SAMPLER_2D = $8B5E;
  GL_SAMPLER_3D = $8B5F;
  GL_SAMPLER_CUBE = $8B60;
  GL_SAMPLER_1D_SHADOW = $8B61;
  GL_SAMPLER_2D_SHADOW = $8B62;
  GL_DELETE_STATUS = $8B80;
  GL_COMPILE_STATUS = $8B81;
  GL_LINK_STATUS = $8B82;
  GL_VALIDATE_STATUS = $8B83;
  GL_INFO_LOG_LENGTH = $8B84;
  GL_ATTACHED_SHADERS = $8B85;
  GL_ACTIVE_UNIFORMS = $8B86;
  GL_ACTIVE_UNIFORM_MAX_LENGTH = $8B87;
  GL_SHADER_SOURCE_LENGTH = $8B88;
  GL_ACTIVE_ATTRIBUTES = $8B89;
  GL_ACTIVE_ATTRIBUTE_MAX_LENGTH = $8B8A;
  GL_FRAGMENT_SHADER_DERIVATIVE_HINT = $8B8B;
  GL_SHADING_LANGUAGE_VERSION = $8B8C;
  GL_CURRENT_PROGRAM = $8B8D;
  GL_POINT_SPRITE_COORD_ORIGIN = $8CA0;
  GL_LOWER_LEFT = $8CA1;
  GL_UPPER_LEFT = $8CA2;
  GL_STENCIL_BACK_REF = $8CA3;
  GL_STENCIL_BACK_VALUE_MASK = $8CA4;
  GL_STENCIL_BACK_WRITEMASK = $8CA5;
var
  glBlendEquationSeparate: procedure(modeRGB: GLenum; modeAlpha: GLenum); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glDrawBuffers: procedure(n: GLsizei; const bufs: PGLenum); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glStencilOpSeparate: procedure(face: GLenum; sfail: GLenum; dpfail: GLenum; dppass: GLenum); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glStencilFuncSeparate: procedure(frontfunc: GLenum; backfunc: GLenum; ref: GLint; mask: GLuint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glStencilMaskSeparate: procedure(face: GLenum; mask: GLuint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glAttachShader: procedure(_program: GLuint; shader: GLuint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glBindAttribLocation: procedure(_program: GLuint; index: GLuint; const name: PGLchar); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glCompileShader: procedure(shader: GLuint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glCreateProgram: function(): GLuint; {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glCreateShader: function(_type: GLenum): GLuint; {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glDeleteProgram: procedure(_program: GLuint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glDeleteShader: procedure(shader: GLuint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glDetachShader: procedure(_program: GLuint; shader: GLuint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glDisableVertexAttribArray: procedure(index: GLuint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glEnableVertexAttribArray: procedure(index: GLuint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glGetActiveAttrib: procedure(_program: GLuint; index: GLuint; bufSize: GLsizei; length: PGLsizei; size: PGLint; _type: PGLenum; name: PGLchar); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glGetActiveUniform: procedure(_program: GLuint; index: GLuint; bufSize: GLsizei; length: PGLsizei; size: PGLint; _type: PGLenum; name: PGLchar); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glGetAttachedShaders: procedure(_program: GLuint; maxCount: GLsizei; count: PGLsizei; obj: PGLuint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glGetAttribLocation: function(_program: GLuint; const name: PGLchar): GLint; {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glGetProgramiv: procedure(_program: GLuint; pname: GLenum; params: PGLint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glGetProgramInfoLog: procedure(_program: GLuint; bufSize: GLsizei; length: PGLsizei; infoLog: PGLchar); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glGetShaderiv: procedure(shader: GLuint; pname: GLenum; params: PGLint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glGetShaderInfoLog: procedure(shader: GLuint; bufSize: GLsizei; length: PGLsizei; infoLog: PGLchar); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glGetShaderSource: procedure(shader: GLuint; bufSize: GLsizei; length: PGLsizei; source: PGLchar); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glGetUniformLocation: function(_program: GLuint; const name: PGLchar): GLint; {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glGetUniformfv: procedure(_program: GLuint; location: GLint; params: PGLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glGetUniformiv: procedure(_program: GLuint; location: GLint; params: PGLint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glGetVertexAttribdv: procedure(index: GLuint; pname: GLenum; params: PGLdouble); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glGetVertexAttribfv: procedure(index: GLuint; pname: GLenum; params: PGLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glGetVertexAttribiv: procedure(index: GLuint; pname: GLenum; params: PGLint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glGetVertexAttribPointerv: procedure(index: GLuint; pname: GLenum; pointer: PGLvoid); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glIsProgram: function(_program: GLuint): GLboolean; {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glIsShader: function(shader: GLuint): GLboolean; {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glLinkProgram: procedure(_program: GLuint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glShaderSource: procedure(shader: GLuint; count: GLsizei; const _string: PGLchar; const length: PGLint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glUseProgram: procedure(_program: GLuint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glUniform1f: procedure(location: GLint; v0: GLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glUniform2f: procedure(location: GLint; v0: GLfloat; v1: GLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glUniform3f: procedure(location: GLint; v0: GLfloat; v1: GLfloat; v2: GLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glUniform4f: procedure(location: GLint; v0: GLfloat; v1: GLfloat; v2: GLfloat; v3: GLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glUniform1i: procedure(location: GLint; v0: GLint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glUniform2i: procedure(location: GLint; v0: GLint; v1: GLint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glUniform3i: procedure(location: GLint; v0: GLint; v1: GLint; v2: GLint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glUniform4i: procedure(location: GLint; v0: GLint; v1: GLint; v2: GLint; v3: GLint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glUniform1fv: procedure(location: GLint; count: GLsizei; const value: PGLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glUniform2fv: procedure(location: GLint; count: GLsizei; const value: PGLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glUniform3fv: procedure(location: GLint; count: GLsizei; const value: PGLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glUniform4fv: procedure(location: GLint; count: GLsizei; const value: PGLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glUniform1iv: procedure(location: GLint; count: GLsizei; const value: PGLint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glUniform2iv: procedure(location: GLint; count: GLsizei; const value: PGLint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glUniform3iv: procedure(location: GLint; count: GLsizei; const value: PGLint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glUniform4iv: procedure(location: GLint; count: GLsizei; const value: PGLint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glUniformMatrix2fv: procedure(location: GLint; count: GLsizei; transpose: GLboolean; const value: PGLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glUniformMatrix3fv: procedure(location: GLint; count: GLsizei; transpose: GLboolean; const value: PGLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glUniformMatrix4fv: procedure(location: GLint; count: GLsizei; transpose: GLboolean; const value: PGLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glValidateProgram: procedure(_program: GLuint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glVertexAttrib1d: procedure(index: GLuint; x: GLdouble); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glVertexAttrib1dv: procedure(index: GLuint; const v: PGLdouble); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glVertexAttrib1f: procedure(index: GLuint; x: GLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glVertexAttrib1fv: procedure(index: GLuint; const v: PGLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glVertexAttrib1s: procedure(index: GLuint; x: GLshort); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glVertexAttrib1sv: procedure(index: GLuint; const v: PGLshort); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glVertexAttrib2d: procedure(index: GLuint; x: GLdouble; y: GLdouble); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glVertexAttrib2dv: procedure(index: GLuint; const v: PGLdouble); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glVertexAttrib2f: procedure(index: GLuint; x: GLfloat; y: GLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glVertexAttrib2fv: procedure(index: GLuint; const v: PGLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glVertexAttrib2s: procedure(index: GLuint; x: GLshort; y: GLshort); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glVertexAttrib2sv: procedure(index: GLuint; const v: PGLshort); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glVertexAttrib3d: procedure(index: GLuint; x: GLdouble; y: GLdouble; z: GLdouble); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glVertexAttrib3dv: procedure(index: GLuint; const v: PGLdouble); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glVertexAttrib3f: procedure(index: GLuint; x: GLfloat; y: GLfloat; z: GLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glVertexAttrib3fv: procedure(index: GLuint; const v: PGLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glVertexAttrib3s: procedure(index: GLuint; x: GLshort; y: GLshort; z: GLshort); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glVertexAttrib3sv: procedure(index: GLuint; const v: PGLshort); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glVertexAttrib4Nbv: procedure(index: GLuint; const v: PGLbyte); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glVertexAttrib4Niv: procedure(index: GLuint; const v: PGLint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glVertexAttrib4Nsv: procedure(index: GLuint; const v: PGLshort); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glVertexAttrib4Nub: procedure(index: GLuint; x: GLubyte; y: GLubyte; z: GLubyte; w: GLubyte); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glVertexAttrib4Nubv: procedure(index: GLuint; const v: PGLubyte); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glVertexAttrib4Nuiv: procedure(index: GLuint; const v: PGLuint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glVertexAttrib4Nusv: procedure(index: GLuint; const v: PGLushort); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glVertexAttrib4bv: procedure(index: GLuint; const v: PGLbyte); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glVertexAttrib4d: procedure(index: GLuint; x: GLdouble; y: GLdouble; z: GLdouble; w: GLdouble); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glVertexAttrib4dv: procedure(index: GLuint; const v: PGLdouble); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glVertexAttrib4f: procedure(index: GLuint; x: GLfloat; y: GLfloat; z: GLfloat; w: GLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glVertexAttrib4fv: procedure(index: GLuint; const v: PGLfloat); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glVertexAttrib4iv: procedure(index: GLuint; const v: PGLint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glVertexAttrib4s: procedure(index: GLuint; x: GLshort; y: GLshort; z: GLshort; w: GLshort); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glVertexAttrib4sv: procedure(index: GLuint; const v: PGLshort); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glVertexAttrib4ubv: procedure(index: GLuint; const v: PGLubyte); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glVertexAttrib4uiv: procedure(index: GLuint; const v: PGLuint); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glVertexAttrib4usv: procedure(index: GLuint; const v: PGLushort); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}
  glVertexAttribPointer: procedure(index: GLuint; size: GLint; _type: GLenum; normalized: GLboolean; stride: GLsizei; const pointer: PGLvoid); {$IFDEF WINDOWS}stdcall;{$ELSE}cdecl;{$ENDIF}

function Load_GL_version_2_0: Boolean;

implementation

uses
  sdl;

function glext_ExtensionSupported(const extension: PChar; const searchIn: PChar): Boolean;
var
  extensions: PChar;
  start: PChar;
  where, terminator: PChar;
begin

  if (Pos(' ', extension) <> 0) or (extension = '') then
  begin
    Result := false;
    Exit;
  end;

  if searchIn = '' then
    extensions := glGetString(GL_EXTENSIONS)
  else
    //StrLCopy(extensions, searchIn, StrLen(searchIn) + 1);
    extensions := searchIn;
  start := extensions;
  while true do
  begin
    where := StrPos(start, extension);
    if where = nil then
      Break;
    terminator := where + Length(extension);
    if (where = start) or ((where - 1)^ = ' ') then
    begin
      if (terminator^ = ' ') or (terminator^ = #0) then
      begin
	Result := true;
	Exit;
      end;
    end;
    start := terminator;
  end;
  Result := false;

end;

function Load_GL_version_1_2: Boolean;
{var
  extstring : PChar;}
begin

  Result := FALSE;
  //extstring := glGetString( GL_EXTENSIONS );

  @glCopyTexSubImage3D := SDL_GL_GetProcAddress('glCopyTexSubImage3D');
  if not Assigned(glCopyTexSubImage3D) then Exit;
  @glDrawRangeElements := SDL_GL_GetProcAddress('glDrawRangeElements');
  if not Assigned(glDrawRangeElements) then Exit;
  @glTexImage3D := SDL_GL_GetProcAddress('glTexImage3D');
  if not Assigned(glTexImage3D) then Exit;
  @glTexSubImage3D := SDL_GL_GetProcAddress('glTexSubImage3D');
  if not Assigned(glTexSubImage3D) then Exit;
    
  Result := TRUE;

end;

function Load_GL_ARB_imaging: Boolean;
var
  extstring : PChar;
begin

  Result := FALSE;
  extstring := glGetString( GL_EXTENSIONS );

  if glext_ExtensionSupported('GL_ARB_imaging', extstring) then
  begin
    @glColorTable := SDL_GL_GetProcAddress('glColorTable');
    if not Assigned(glColorTable) then Exit;
    @glColorTableParameterfv := SDL_GL_GetProcAddress('glColorTableParameterfv');
    if not Assigned(glColorTableParameterfv) then Exit;
    @glColorTableParameteriv := SDL_GL_GetProcAddress('glColorTableParameteriv');
    if not Assigned(glColorTableParameteriv) then Exit;
    @glCopyColorTable := SDL_GL_GetProcAddress('glCopyColorTable');
    if not Assigned(glCopyColorTable) then Exit;
    @glGetColorTable := SDL_GL_GetProcAddress('glGetColorTable');
    if not Assigned(glGetColorTable) then Exit;
    @glGetColorTableParameterfv := SDL_GL_GetProcAddress('glGetColorTableParameterfv');
    if not Assigned(glGetColorTableParameterfv) then Exit;
    @glGetColorTableParameteriv := SDL_GL_GetProcAddress('glGetColorTableParameteriv');
    if not Assigned(glGetColorTableParameteriv) then Exit;
    @glColorSubTable := SDL_GL_GetProcAddress('glColorSubTable');
    if not Assigned(glColorSubTable) then Exit;
    @glCopyColorSubTable := SDL_GL_GetProcAddress('glCopyColorSubTable');
    if not Assigned(glCopyColorSubTable) then Exit;
    @glConvolutionFilter1D := SDL_GL_GetProcAddress('glConvolutionFilter1D');
    if not Assigned(glConvolutionFilter1D) then Exit;
    @glConvolutionFilter2D := SDL_GL_GetProcAddress('glConvolutionFilter2D');
    if not Assigned(glConvolutionFilter2D) then Exit;
    @glConvolutionParameterf := SDL_GL_GetProcAddress('glConvolutionParameterf');
    if not Assigned(glConvolutionParameterf) then Exit;
    @glConvolutionParameterfv := SDL_GL_GetProcAddress('glConvolutionParameterfv');
    if not Assigned(glConvolutionParameterfv) then Exit;
    @glConvolutionParameteri := SDL_GL_GetProcAddress('glConvolutionParameteri');
    if not Assigned(glConvolutionParameteri) then Exit;
    @glConvolutionParameteriv := SDL_GL_GetProcAddress('glConvolutionParameteriv');
    if not Assigned(glConvolutionParameteriv) then Exit;
    @glCopyConvolutionFilter1D := SDL_GL_GetProcAddress('glCopyConvolutionFilter1D');
    if not Assigned(glCopyConvolutionFilter1D) then Exit;
    @glCopyConvolutionFilter2D := SDL_GL_GetProcAddress('glCopyConvolutionFilter2D');
    if not Assigned(glCopyConvolutionFilter2D) then Exit;
    @glGetConvolutionFilter := SDL_GL_GetProcAddress('glGetConvolutionFilter');
    if not Assigned(glGetConvolutionFilter) then Exit;
    @glGetConvolutionParameterfv := SDL_GL_GetProcAddress('glGetConvolutionParameterfv');
    if not Assigned(glGetConvolutionParameterfv) then Exit;
    @glGetConvolutionParameteriv := SDL_GL_GetProcAddress('glGetConvolutionParameteriv');
    if not Assigned(glGetConvolutionParameteriv) then Exit;
    @glGetSeparableFilter := SDL_GL_GetProcAddress('glGetSeparableFilter');
    if not Assigned(glGetSeparableFilter) then Exit;
    @glSeparableFilter2D := SDL_GL_GetProcAddress('glSeparableFilter2D');
    if not Assigned(glSeparableFilter2D) then Exit;
    @glGetHistogram := SDL_GL_GetProcAddress('glGetHistogram');
    if not Assigned(glGetHistogram) then Exit;
    @glGetHistogramParameterfv := SDL_GL_GetProcAddress('glGetHistogramParameterfv');
    if not Assigned(glGetHistogramParameterfv) then Exit;
    @glGetHistogramParameteriv := SDL_GL_GetProcAddress('glGetHistogramParameteriv');
    if not Assigned(glGetHistogramParameteriv) then Exit;
    @glGetMinmax := SDL_GL_GetProcAddress('glGetMinmax');
    if not Assigned(glGetMinmax) then Exit;
    @glGetMinmaxParameterfv := SDL_GL_GetProcAddress('glGetMinmaxParameterfv');
    if not Assigned(glGetMinmaxParameterfv) then Exit;
    @glGetMinmaxParameteriv := SDL_GL_GetProcAddress('glGetMinmaxParameteriv');
    if not Assigned(glGetMinmaxParameteriv) then Exit;
    @glHistogram := SDL_GL_GetProcAddress('glHistogram');
    if not Assigned(glHistogram) then Exit;
    @glMinmax := SDL_GL_GetProcAddress('glMinmax');
    if not Assigned(glMinmax) then Exit;
    @glResetHistogram := SDL_GL_GetProcAddress('glResetHistogram');
    if not Assigned(glResetHistogram) then Exit;
    @glResetMinmax := SDL_GL_GetProcAddress('glResetMinmax');
    if not Assigned(glResetMinmax) then Exit;
    @glBlendEquation := SDL_GL_GetProcAddress('glBlendEquation');
    if not Assigned(glBlendEquation) then Exit;
    @glBlendColor := SDL_GL_GetProcAddress('glBlendColor');
    if not Assigned(glBlendColor) then Exit;
    Result := TRUE;
  end;

end;

function Load_GL_version_1_3: Boolean;
var
  extstring : PChar;
begin

  Result := FALSE;
  extstring := glGetString( GL_EXTENSIONS );

    @glActiveTexture := SDL_GL_GetProcAddress('glActiveTexture');
    if not Assigned(glActiveTexture) then Exit;
    @glClientActiveTexture := SDL_GL_GetProcAddress('glClientActiveTexture');
    if not Assigned(glClientActiveTexture) then Exit;
    @glMultiTexCoord1d := SDL_GL_GetProcAddress('glMultiTexCoord1d');
    if not Assigned(glMultiTexCoord1d) then Exit;
    @glMultiTexCoord1dv := SDL_GL_GetProcAddress('glMultiTexCoord1dv');
    if not Assigned(glMultiTexCoord1dv) then Exit;
    @glMultiTexCoord1f := SDL_GL_GetProcAddress('glMultiTexCoord1f');
    if not Assigned(glMultiTexCoord1f) then Exit;
    @glMultiTexCoord1fv := SDL_GL_GetProcAddress('glMultiTexCoord1fv');
    if not Assigned(glMultiTexCoord1fv) then Exit;
    @glMultiTexCoord1i := SDL_GL_GetProcAddress('glMultiTexCoord1i');
    if not Assigned(glMultiTexCoord1i) then Exit;
    @glMultiTexCoord1iv := SDL_GL_GetProcAddress('glMultiTexCoord1iv');
    if not Assigned(glMultiTexCoord1iv) then Exit;
    @glMultiTexCoord1s := SDL_GL_GetProcAddress('glMultiTexCoord1s');
    if not Assigned(glMultiTexCoord1s) then Exit;
    @glMultiTexCoord1sv := SDL_GL_GetProcAddress('glMultiTexCoord1sv');
    if not Assigned(glMultiTexCoord1sv) then Exit;
    @glMultiTexCoord2d := SDL_GL_GetProcAddress('glMultiTexCoord2d');
    if not Assigned(glMultiTexCoord2d) then Exit;
    @glMultiTexCoord2dv := SDL_GL_GetProcAddress('glMultiTexCoord2dv');
    if not Assigned(glMultiTexCoord2dv) then Exit;
    @glMultiTexCoord2f := SDL_GL_GetProcAddress('glMultiTexCoord2f');
    if not Assigned(glMultiTexCoord2f) then Exit;
    @glMultiTexCoord2fv := SDL_GL_GetProcAddress('glMultiTexCoord2fv');
    if not Assigned(glMultiTexCoord2fv) then Exit;
    @glMultiTexCoord2i := SDL_GL_GetProcAddress('glMultiTexCoord2i');
    if not Assigned(glMultiTexCoord2i) then Exit;
    @glMultiTexCoord2iv := SDL_GL_GetProcAddress('glMultiTexCoord2iv');
    if not Assigned(glMultiTexCoord2iv) then Exit;
    @glMultiTexCoord2s := SDL_GL_GetProcAddress('glMultiTexCoord2s');
    if not Assigned(glMultiTexCoord2s) then Exit;
    @glMultiTexCoord2sv := SDL_GL_GetProcAddress('glMultiTexCoord2sv');
    if not Assigned(glMultiTexCoord2sv) then Exit;
    @glMultiTexCoord3d := SDL_GL_GetProcAddress('glMultiTexCoord3d');
    if not Assigned(glMultiTexCoord3d) then Exit;
    @glMultiTexCoord3dv := SDL_GL_GetProcAddress('glMultiTexCoord3dv');
    if not Assigned(glMultiTexCoord3dv) then Exit;
    @glMultiTexCoord3f := SDL_GL_GetProcAddress('glMultiTexCoord3f');
    if not Assigned(glMultiTexCoord3f) then Exit;
    @glMultiTexCoord3fv := SDL_GL_GetProcAddress('glMultiTexCoord3fv');
    if not Assigned(glMultiTexCoord3fv) then Exit;
    @glMultiTexCoord3i := SDL_GL_GetProcAddress('glMultiTexCoord3i');
    if not Assigned(glMultiTexCoord3i) then Exit;
    @glMultiTexCoord3iv := SDL_GL_GetProcAddress('glMultiTexCoord3iv');
    if not Assigned(glMultiTexCoord3iv) then Exit;
    @glMultiTexCoord3s := SDL_GL_GetProcAddress('glMultiTexCoord3s');
    if not Assigned(glMultiTexCoord3s) then Exit;
    @glMultiTexCoord3sv := SDL_GL_GetProcAddress('glMultiTexCoord3sv');
    if not Assigned(glMultiTexCoord3sv) then Exit;
    @glMultiTexCoord4d := SDL_GL_GetProcAddress('glMultiTexCoord4d');
    if not Assigned(glMultiTexCoord4d) then Exit;
    @glMultiTexCoord4dv := SDL_GL_GetProcAddress('glMultiTexCoord4dv');
    if not Assigned(glMultiTexCoord4dv) then Exit;
    @glMultiTexCoord4f := SDL_GL_GetProcAddress('glMultiTexCoord4f');
    if not Assigned(glMultiTexCoord4f) then Exit;
    @glMultiTexCoord4fv := SDL_GL_GetProcAddress('glMultiTexCoord4fv');
    if not Assigned(glMultiTexCoord4fv) then Exit;
    @glMultiTexCoord4i := SDL_GL_GetProcAddress('glMultiTexCoord4i');
    if not Assigned(glMultiTexCoord4i) then Exit;
    @glMultiTexCoord4iv := SDL_GL_GetProcAddress('glMultiTexCoord4iv');
    if not Assigned(glMultiTexCoord4iv) then Exit;
    @glMultiTexCoord4s := SDL_GL_GetProcAddress('glMultiTexCoord4s');
    if not Assigned(glMultiTexCoord4s) then Exit;
    @glMultiTexCoord4sv := SDL_GL_GetProcAddress('glMultiTexCoord4sv');
    if not Assigned(glMultiTexCoord4sv) then Exit;
    @glLoadTransposeMatrixf := SDL_GL_GetProcAddress('glLoadTransposeMatrixf');
    if not Assigned(glLoadTransposeMatrixf) then Exit;
    @glLoadTransposeMatrixd := SDL_GL_GetProcAddress('glLoadTransposeMatrixd');
    if not Assigned(glLoadTransposeMatrixd) then Exit;
    @glMultTransposeMatrixf := SDL_GL_GetProcAddress('glMultTransposeMatrixf');
    if not Assigned(glMultTransposeMatrixf) then Exit;
    @glMultTransposeMatrixd := SDL_GL_GetProcAddress('glMultTransposeMatrixd');
    if not Assigned(glMultTransposeMatrixd) then Exit;
    @glSampleCoverage := SDL_GL_GetProcAddress('glSampleCoverage');
    if not Assigned(glSampleCoverage) then Exit;
    @glCompressedTexImage3D := SDL_GL_GetProcAddress('glCompressedTexImage3D');
    if not Assigned(glCompressedTexImage3D) then Exit;
    @glCompressedTexImage2D := SDL_GL_GetProcAddress('glCompressedTexImage2D');
    if not Assigned(glCompressedTexImage2D) then Exit;
    @glCompressedTexImage1D := SDL_GL_GetProcAddress('glCompressedTexImage1D');
    if not Assigned(glCompressedTexImage1D) then Exit;
    @glCompressedTexSubImage3D := SDL_GL_GetProcAddress('glCompressedTexSubImage3D');
    if not Assigned(glCompressedTexSubImage3D) then Exit;
    @glCompressedTexSubImage2D := SDL_GL_GetProcAddress('glCompressedTexSubImage2D');
    if not Assigned(glCompressedTexSubImage2D) then Exit;
    @glCompressedTexSubImage1D := SDL_GL_GetProcAddress('glCompressedTexSubImage1D');
    if not Assigned(glCompressedTexSubImage1D) then Exit;
    @glGetCompressedTexImage := SDL_GL_GetProcAddress('glGetCompressedTexImage');
    if not Assigned(glGetCompressedTexImage) then Exit;
    Result := TRUE;

end;

function Load_GL_ARB_multitexture: Boolean;
var
  extstring : PChar;
begin

  Result := FALSE;
  extstring := glGetString( GL_EXTENSIONS );

  if glext_ExtensionSupported('GL_ARB_multitexture', extstring) then
  begin
    @glActiveTextureARB := SDL_GL_GetProcAddress('glActiveTextureARB');
    if not Assigned(glActiveTextureARB) then Exit;
    @glClientActiveTextureARB := SDL_GL_GetProcAddress('glClientActiveTextureARB');
    if not Assigned(glClientActiveTextureARB) then Exit;
    @glMultiTexCoord1dARB := SDL_GL_GetProcAddress('glMultiTexCoord1dARB');
    if not Assigned(glMultiTexCoord1dARB) then Exit;
    @glMultiTexCoord1dvARB := SDL_GL_GetProcAddress('glMultiTexCoord1dvARB');
    if not Assigned(glMultiTexCoord1dvARB) then Exit;
    @glMultiTexCoord1fARB := SDL_GL_GetProcAddress('glMultiTexCoord1fARB');
    if not Assigned(glMultiTexCoord1fARB) then Exit;
    @glMultiTexCoord1fvARB := SDL_GL_GetProcAddress('glMultiTexCoord1fvARB');
    if not Assigned(glMultiTexCoord1fvARB) then Exit;
    @glMultiTexCoord1iARB := SDL_GL_GetProcAddress('glMultiTexCoord1iARB');
    if not Assigned(glMultiTexCoord1iARB) then Exit;
    @glMultiTexCoord1ivARB := SDL_GL_GetProcAddress('glMultiTexCoord1ivARB');
    if not Assigned(glMultiTexCoord1ivARB) then Exit;
    @glMultiTexCoord1sARB := SDL_GL_GetProcAddress('glMultiTexCoord1sARB');
    if not Assigned(glMultiTexCoord1sARB) then Exit;
    @glMultiTexCoord1svARB := SDL_GL_GetProcAddress('glMultiTexCoord1svARB');
    if not Assigned(glMultiTexCoord1svARB) then Exit;
    @glMultiTexCoord2dARB := SDL_GL_GetProcAddress('glMultiTexCoord2dARB');
    if not Assigned(glMultiTexCoord2dARB) then Exit;
    @glMultiTexCoord2dvARB := SDL_GL_GetProcAddress('glMultiTexCoord2dvARB');
    if not Assigned(glMultiTexCoord2dvARB) then Exit;
    @glMultiTexCoord2fARB := SDL_GL_GetProcAddress('glMultiTexCoord2fARB');
    if not Assigned(glMultiTexCoord2fARB) then Exit;
    @glMultiTexCoord2fvARB := SDL_GL_GetProcAddress('glMultiTexCoord2fvARB');
    if not Assigned(glMultiTexCoord2fvARB) then Exit;
    @glMultiTexCoord2iARB := SDL_GL_GetProcAddress('glMultiTexCoord2iARB');
    if not Assigned(glMultiTexCoord2iARB) then Exit;
    @glMultiTexCoord2ivARB := SDL_GL_GetProcAddress('glMultiTexCoord2ivARB');
    if not Assigned(glMultiTexCoord2ivARB) then Exit;
    @glMultiTexCoord2sARB := SDL_GL_GetProcAddress('glMultiTexCoord2sARB');
    if not Assigned(glMultiTexCoord2sARB) then Exit;
    @glMultiTexCoord2svARB := SDL_GL_GetProcAddress('glMultiTexCoord2svARB');
    if not Assigned(glMultiTexCoord2svARB) then Exit;
    @glMultiTexCoord3dARB := SDL_GL_GetProcAddress('glMultiTexCoord3dARB');
    if not Assigned(glMultiTexCoord3dARB) then Exit;
    @glMultiTexCoord3dvARB := SDL_GL_GetProcAddress('glMultiTexCoord3dvARB');
    if not Assigned(glMultiTexCoord3dvARB) then Exit;
    @glMultiTexCoord3fARB := SDL_GL_GetProcAddress('glMultiTexCoord3fARB');
    if not Assigned(glMultiTexCoord3fARB) then Exit;
    @glMultiTexCoord3fvARB := SDL_GL_GetProcAddress('glMultiTexCoord3fvARB');
    if not Assigned(glMultiTexCoord3fvARB) then Exit;
    @glMultiTexCoord3iARB := SDL_GL_GetProcAddress('glMultiTexCoord3iARB');
    if not Assigned(glMultiTexCoord3iARB) then Exit;
    @glMultiTexCoord3ivARB := SDL_GL_GetProcAddress('glMultiTexCoord3ivARB');
    if not Assigned(glMultiTexCoord3ivARB) then Exit;
    @glMultiTexCoord3sARB := SDL_GL_GetProcAddress('glMultiTexCoord3sARB');
    if not Assigned(glMultiTexCoord3sARB) then Exit;
    @glMultiTexCoord3svARB := SDL_GL_GetProcAddress('glMultiTexCoord3svARB');
    if not Assigned(glMultiTexCoord3svARB) then Exit;
    @glMultiTexCoord4dARB := SDL_GL_GetProcAddress('glMultiTexCoord4dARB');
    if not Assigned(glMultiTexCoord4dARB) then Exit;
    @glMultiTexCoord4dvARB := SDL_GL_GetProcAddress('glMultiTexCoord4dvARB');
    if not Assigned(glMultiTexCoord4dvARB) then Exit;
    @glMultiTexCoord4fARB := SDL_GL_GetProcAddress('glMultiTexCoord4fARB');
    if not Assigned(glMultiTexCoord4fARB) then Exit;
    @glMultiTexCoord4fvARB := SDL_GL_GetProcAddress('glMultiTexCoord4fvARB');
    if not Assigned(glMultiTexCoord4fvARB) then Exit;
    @glMultiTexCoord4iARB := SDL_GL_GetProcAddress('glMultiTexCoord4iARB');
    if not Assigned(glMultiTexCoord4iARB) then Exit;
    @glMultiTexCoord4ivARB := SDL_GL_GetProcAddress('glMultiTexCoord4ivARB');
    if not Assigned(glMultiTexCoord4ivARB) then Exit;
    @glMultiTexCoord4sARB := SDL_GL_GetProcAddress('glMultiTexCoord4sARB');
    if not Assigned(glMultiTexCoord4sARB) then Exit;
    @glMultiTexCoord4svARB := SDL_GL_GetProcAddress('glMultiTexCoord4svARB');
    if not Assigned(glMultiTexCoord4svARB) then Exit;
    Result := TRUE;
  end;

end;

function Load_GL_ARB_transpose_matrix: Boolean;
var
  extstring : PChar;
begin

  Result := FALSE;
  extstring := glGetString( GL_EXTENSIONS );

  if glext_ExtensionSupported('GL_ARB_transpose_matrix', extstring) then
  begin
    @glLoadTransposeMatrixfARB := SDL_GL_GetProcAddress('glLoadTransposeMatrixfARB');
    if not Assigned(glLoadTransposeMatrixfARB) then Exit;
    @glLoadTransposeMatrixdARB := SDL_GL_GetProcAddress('glLoadTransposeMatrixdARB');
    if not Assigned(glLoadTransposeMatrixdARB) then Exit;
    @glMultTransposeMatrixfARB := SDL_GL_GetProcAddress('glMultTransposeMatrixfARB');
    if not Assigned(glMultTransposeMatrixfARB) then Exit;
    @glMultTransposeMatrixdARB := SDL_GL_GetProcAddress('glMultTransposeMatrixdARB');
    if not Assigned(glMultTransposeMatrixdARB) then Exit;
    Result := TRUE;
  end;

end;

function Load_GL_ARB_multisample: Boolean;
var
  extstring : PChar;
begin

  Result := FALSE;
  extstring := glGetString( GL_EXTENSIONS );

  if glext_ExtensionSupported('GL_ARB_multisample', extstring) then
  begin
    @glSampleCoverageARB := SDL_GL_GetProcAddress('glSampleCoverageARB');
    if not Assigned(glSampleCoverageARB) then Exit;
    Result := TRUE;
  end;

end;

function Load_GL_ARB_texture_env_add: Boolean;
var
  extstring : PChar;
begin

  Result := FALSE;
  extstring := glGetString( GL_EXTENSIONS );

  if glext_ExtensionSupported('GL_ARB_texture_env_add', extstring) then
  begin
    Result := TRUE;
  end;

end;

{$IFDEF WINDOWS}
function Load_WGL_ARB_extensions_string: Boolean;
var
  extstring : PChar;
begin

  Result := FALSE;
  @wglGetExtensionsStringARB := SDL_GL_GetProcAddress('wglGetExtensionsStringARB');
  if not Assigned(wglGetExtensionsStringARB) then Exit;
  extstring := wglGetExtensionsStringARB(wglGetCurrentDC);

  if glext_ExtensionSupported('WGL_ARB_extensions_string', extstring) then
  begin
    @wglGetExtensionsStringARB := SDL_GL_GetProcAddress('wglGetExtensionsStringARB');
    if not Assigned(wglGetExtensionsStringARB) then Exit;
    Result := TRUE;
  end;

end;

function Load_WGL_ARB_buffer_region: Boolean;
var
  extstring : PChar;
begin

  Result := FALSE;
  @wglGetExtensionsStringARB := SDL_GL_GetProcAddress('wglGetExtensionsStringARB');
  if not Assigned(wglGetExtensionsStringARB) then Exit;
  extstring := wglGetExtensionsStringARB(wglGetCurrentDC);

  if glext_ExtensionSupported('WGL_ARB_buffer_region', extstring) then
  begin
    @wglCreateBufferRegionARB := SDL_GL_GetProcAddress('wglCreateBufferRegionARB');
    if not Assigned(wglCreateBufferRegionARB) then Exit;
    @wglDeleteBufferRegionARB := SDL_GL_GetProcAddress('wglDeleteBufferRegionARB');
    if not Assigned(wglDeleteBufferRegionARB) then Exit;
    @wglSaveBufferRegionARB := SDL_GL_GetProcAddress('wglSaveBufferRegionARB');
    if not Assigned(wglSaveBufferRegionARB) then Exit;
    @wglRestoreBufferRegionARB := SDL_GL_GetProcAddress('wglRestoreBufferRegionARB');
    if not Assigned(wglRestoreBufferRegionARB) then Exit;
    Result := TRUE;
  end;

end;
{$ENDIF}

function Load_GL_ARB_texture_cube_map: Boolean;
var
  extstring : PChar;
begin

  Result := FALSE;
  extstring := glGetString( GL_EXTENSIONS );

  if glext_ExtensionSupported('GL_ARB_texture_cube_map', extstring) then
  begin
    Result := TRUE;
  end;

end;

function Load_GL_ARB_depth_texture: Boolean;
var
  extstring : PChar;
begin

  Result := FALSE;
  extstring := glGetString( GL_EXTENSIONS );

  if glext_ExtensionSupported('GL_ARB_depth_texture', extstring) then
  begin
    Result := TRUE;
  end;

end;

function Load_GL_ARB_point_parameters: Boolean;
var
  extstring : PChar;
begin

  Result := FALSE;
  extstring := glGetString( GL_EXTENSIONS );

  if glext_ExtensionSupported('GL_ARB_point_parameters', extstring) then
  begin
    @glPointParameterfARB := SDL_GL_GetProcAddress('glPointParameterfARB');
    if not Assigned(glPointParameterfARB) then Exit;
    @glPointParameterfvARB := SDL_GL_GetProcAddress('glPointParameterfvARB');
    if not Assigned(glPointParameterfvARB) then Exit;
    Result := TRUE;
  end;

end;

function Load_GL_ARB_shadow: Boolean;
var
  extstring : PChar;
begin

  Result := FALSE;
  extstring := glGetString( GL_EXTENSIONS );

  if glext_ExtensionSupported('GL_ARB_shadow', extstring) then
  begin
    Result := TRUE;
  end;

end;

function Load_GL_ARB_shadow_ambient: Boolean;
var
  extstring : PChar;
begin

  Result := FALSE;
  extstring := glGetString( GL_EXTENSIONS );

  if glext_ExtensionSupported('GL_ARB_shadow_ambient', extstring) then
  begin
    Result := TRUE;
  end;

end;

function Load_GL_ARB_texture_border_clamp: Boolean;
var
  extstring : PChar;
begin

  Result := FALSE;
  extstring := glGetString( GL_EXTENSIONS );

  if glext_ExtensionSupported('GL_ARB_texture_border_clamp', extstring) then
  begin
    Result := TRUE;
  end;

end;

function Load_GL_ARB_texture_compression: Boolean;
var
  extstring : PChar;
begin

  Result := FALSE;
  extstring := glGetString( GL_EXTENSIONS );

  if glext_ExtensionSupported('GL_ARB_texture_compression', extstring) then
  begin
    @glCompressedTexImage3DARB := SDL_GL_GetProcAddress('glCompressedTexImage3DARB');
    if not Assigned(glCompressedTexImage3DARB) then Exit;
    @glCompressedTexImage2DARB := SDL_GL_GetProcAddress('glCompressedTexImage2DARB');
    if not Assigned(glCompressedTexImage2DARB) then Exit;
    @glCompressedTexImage1DARB := SDL_GL_GetProcAddress('glCompressedTexImage1DARB');
    if not Assigned(glCompressedTexImage1DARB) then Exit;
    @glCompressedTexSubImage3DARB := SDL_GL_GetProcAddress('glCompressedTexSubImage3DARB');
    if not Assigned(glCompressedTexSubImage3DARB) then Exit;
    @glCompressedTexSubImage2DARB := SDL_GL_GetProcAddress('glCompressedTexSubImage2DARB');
    if not Assigned(glCompressedTexSubImage2DARB) then Exit;
    @glCompressedTexSubImage1DARB := SDL_GL_GetProcAddress('glCompressedTexSubImage1DARB');
    if not Assigned(glCompressedTexSubImage1DARB) then Exit;
    @glGetCompressedTexImageARB := SDL_GL_GetProcAddress('glGetCompressedTexImageARB');
    if not Assigned(glGetCompressedTexImageARB) then Exit;
    Result := TRUE;
  end;

end;

function Load_GL_ARB_texture_env_combine: Boolean;
var
  extstring : PChar;
begin

  Result := FALSE;
  extstring := glGetString( GL_EXTENSIONS );

  if glext_ExtensionSupported('GL_ARB_texture_env_combine', extstring) then
  begin
    Result := TRUE;
  end;

end;

function Load_GL_ARB_texture_env_crossbar: Boolean;
var
  extstring : PChar;
begin

  Result := FALSE;
  extstring := glGetString( GL_EXTENSIONS );

  if glext_ExtensionSupported('GL_ARB_texture_env_crossbar', extstring) then
  begin
    Result := TRUE;
  end;

end;

function Load_GL_ARB_texture_env_dot3: Boolean;
var
  extstring : PChar;
begin

  Result := FALSE;
  extstring := glGetString( GL_EXTENSIONS );

  if glext_ExtensionSupported('GL_ARB_texture_env_dot3', extstring) then
  begin
    Result := TRUE;
  end;

end;

function Load_GL_ARB_texture_mirrored_repeat: Boolean;
var
  extstring : PChar;
begin

  Result := FALSE;
  extstring := glGetString( GL_EXTENSIONS );

  if glext_ExtensionSupported('GL_ARB_texture_mirrored_repeat', extstring) then
  begin
    Result := TRUE;
  end;

end;

function Load_GL_ARB_vertex_blend: Boolean;
var
  extstring : PChar;
begin

  Result := FALSE;
  extstring := glGetString( GL_EXTENSIONS );

  if glext_ExtensionSupported('GL_ARB_vertex_blend', extstring) then
  begin
    @glWeightbvARB := SDL_GL_GetProcAddress('glWeightbvARB');
    if not Assigned(glWeightbvARB) then Exit;
    @glWeightsvARB := SDL_GL_GetProcAddress('glWeightsvARB');
    if not Assigned(glWeightsvARB) then Exit;
    @glWeightivARB := SDL_GL_GetProcAddress('glWeightivARB');
    if not Assigned(glWeightivARB) then Exit;
    @glWeightfvARB := SDL_GL_GetProcAddress('glWeightfvARB');
    if not Assigned(glWeightfvARB) then Exit;
    @glWeightdvARB := SDL_GL_GetProcAddress('glWeightdvARB');
    if not Assigned(glWeightdvARB) then Exit;
    @glWeightvARB := SDL_GL_GetProcAddress('glWeightvARB');
    if not Assigned(glWeightvARB) then Exit;
    @glWeightubvARB := SDL_GL_GetProcAddress('glWeightubvARB');
    if not Assigned(glWeightubvARB) then Exit;
    @glWeightusvARB := SDL_GL_GetProcAddress('glWeightusvARB');
    if not Assigned(glWeightusvARB) then Exit;
    @glWeightuivARB := SDL_GL_GetProcAddress('glWeightuivARB');
    if not Assigned(glWeightuivARB) then Exit;
    @glWeightPointerARB := SDL_GL_GetProcAddress('glWeightPointerARB');
    if not Assigned(glWeightPointerARB) then Exit;
    @glVertexBlendARB := SDL_GL_GetProcAddress('glVertexBlendARB');
    if not Assigned(glVertexBlendARB) then Exit;
    Result := TRUE;
  end;

end;

function Load_GL_ARB_vertex_program: Boolean;
var
  extstring : PChar;
begin

  Result := FALSE;
  extstring := glGetString( GL_EXTENSIONS );

  if glext_ExtensionSupported('GL_ARB_vertex_program', extstring) then
  begin
    @glVertexAttrib1sARB := SDL_GL_GetProcAddress('glVertexAttrib1sARB');
    if not Assigned(glVertexAttrib1sARB) then Exit;
    @glVertexAttrib1fARB := SDL_GL_GetProcAddress('glVertexAttrib1fARB');
    if not Assigned(glVertexAttrib1fARB) then Exit;
    @glVertexAttrib1dARB := SDL_GL_GetProcAddress('glVertexAttrib1dARB');
    if not Assigned(glVertexAttrib1dARB) then Exit;
    @glVertexAttrib2sARB := SDL_GL_GetProcAddress('glVertexAttrib2sARB');
    if not Assigned(glVertexAttrib2sARB) then Exit;
    @glVertexAttrib2fARB := SDL_GL_GetProcAddress('glVertexAttrib2fARB');
    if not Assigned(glVertexAttrib2fARB) then Exit;
    @glVertexAttrib2dARB := SDL_GL_GetProcAddress('glVertexAttrib2dARB');
    if not Assigned(glVertexAttrib2dARB) then Exit;
    @glVertexAttrib3sARB := SDL_GL_GetProcAddress('glVertexAttrib3sARB');
    if not Assigned(glVertexAttrib3sARB) then Exit;
    @glVertexAttrib3fARB := SDL_GL_GetProcAddress('glVertexAttrib3fARB');
    if not Assigned(glVertexAttrib3fARB) then Exit;
    @glVertexAttrib3dARB := SDL_GL_GetProcAddress('glVertexAttrib3dARB');
    if not Assigned(glVertexAttrib3dARB) then Exit;
    @glVertexAttrib4sARB := SDL_GL_GetProcAddress('glVertexAttrib4sARB');
    if not Assigned(glVertexAttrib4sARB) then Exit;
    @glVertexAttrib4fARB := SDL_GL_GetProcAddress('glVertexAttrib4fARB');
    if not Assigned(glVertexAttrib4fARB) then Exit;
    @glVertexAttrib4dARB := SDL_GL_GetProcAddress('glVertexAttrib4dARB');
    if not Assigned(glVertexAttrib4dARB) then Exit;
    @glVertexAttrib4NubARB := SDL_GL_GetProcAddress('glVertexAttrib4NubARB');
    if not Assigned(glVertexAttrib4NubARB) then Exit;
    @glVertexAttrib1svARB := SDL_GL_GetProcAddress('glVertexAttrib1svARB');
    if not Assigned(glVertexAttrib1svARB) then Exit;
    @glVertexAttrib1fvARB := SDL_GL_GetProcAddress('glVertexAttrib1fvARB');
    if not Assigned(glVertexAttrib1fvARB) then Exit;
    @glVertexAttrib1dvARB := SDL_GL_GetProcAddress('glVertexAttrib1dvARB');
    if not Assigned(glVertexAttrib1dvARB) then Exit;
    @glVertexAttrib2svARB := SDL_GL_GetProcAddress('glVertexAttrib2svARB');
    if not Assigned(glVertexAttrib2svARB) then Exit;
    @glVertexAttrib2fvARB := SDL_GL_GetProcAddress('glVertexAttrib2fvARB');
    if not Assigned(glVertexAttrib2fvARB) then Exit;
    @glVertexAttrib2dvARB := SDL_GL_GetProcAddress('glVertexAttrib2dvARB');
    if not Assigned(glVertexAttrib2dvARB) then Exit;
    @glVertexAttrib3svARB := SDL_GL_GetProcAddress('glVertexAttrib3svARB');
    if not Assigned(glVertexAttrib3svARB) then Exit;
    @glVertexAttrib3fvARB := SDL_GL_GetProcAddress('glVertexAttrib3fvARB');
    if not Assigned(glVertexAttrib3fvARB) then Exit;
    @glVertexAttrib3dvARB := SDL_GL_GetProcAddress('glVertexAttrib3dvARB');
    if not Assigned(glVertexAttrib3dvARB) then Exit;
    @glVertexAttrib4bvARB := SDL_GL_GetProcAddress('glVertexAttrib4bvARB');
    if not Assigned(glVertexAttrib4bvARB) then Exit;
    @glVertexAttrib4svARB := SDL_GL_GetProcAddress('glVertexAttrib4svARB');
    if not Assigned(glVertexAttrib4svARB) then Exit;
    @glVertexAttrib4ivARB := SDL_GL_GetProcAddress('glVertexAttrib4ivARB');
    if not Assigned(glVertexAttrib4ivARB) then Exit;
    @glVertexAttrib4ubvARB := SDL_GL_GetProcAddress('glVertexAttrib4ubvARB');
    if not Assigned(glVertexAttrib4ubvARB) then Exit;
    @glVertexAttrib4usvARB := SDL_GL_GetProcAddress('glVertexAttrib4usvARB');
    if not Assigned(glVertexAttrib4usvARB) then Exit;
    @glVertexAttrib4uivARB := SDL_GL_GetProcAddress('glVertexAttrib4uivARB');
    if not Assigned(glVertexAttrib4uivARB) then Exit;
    @glVertexAttrib4fvARB := SDL_GL_GetProcAddress('glVertexAttrib4fvARB');
    if not Assigned(glVertexAttrib4fvARB) then Exit;
    @glVertexAttrib4dvARB := SDL_GL_GetProcAddress('glVertexAttrib4dvARB');
    if not Assigned(glVertexAttrib4dvARB) then Exit;
    @glVertexAttrib4NbvARB := SDL_GL_GetProcAddress('glVertexAttrib4NbvARB');
    if not Assigned(glVertexAttrib4NbvARB) then Exit;
    @glVertexAttrib4NsvARB := SDL_GL_GetProcAddress('glVertexAttrib4NsvARB');
    if not Assigned(glVertexAttrib4NsvARB) then Exit;
    @glVertexAttrib4NivARB := SDL_GL_GetProcAddress('glVertexAttrib4NivARB');
    if not Assigned(glVertexAttrib4NivARB) then Exit;
    @glVertexAttrib4NubvARB := SDL_GL_GetProcAddress('glVertexAttrib4NubvARB');
    if not Assigned(glVertexAttrib4NubvARB) then Exit;
    @glVertexAttrib4NusvARB := SDL_GL_GetProcAddress('glVertexAttrib4NusvARB');
    if not Assigned(glVertexAttrib4NusvARB) then Exit;
    @glVertexAttrib4NuivARB := SDL_GL_GetProcAddress('glVertexAttrib4NuivARB');
    if not Assigned(glVertexAttrib4NuivARB) then Exit;
    @glVertexAttribPointerARB := SDL_GL_GetProcAddress('glVertexAttribPointerARB');
    if not Assigned(glVertexAttribPointerARB) then Exit;
    @glEnableVertexAttribArrayARB := SDL_GL_GetProcAddress('glEnableVertexAttribArrayARB');
    if not Assigned(glEnableVertexAttribArrayARB) then Exit;
    @glDisableVertexAttribArrayARB := SDL_GL_GetProcAddress('glDisableVertexAttribArrayARB');
    if not Assigned(glDisableVertexAttribArrayARB) then Exit;
    @glProgramStringARB := SDL_GL_GetProcAddress('glProgramStringARB');
    if not Assigned(glProgramStringARB) then Exit;
    @glBindProgramARB := SDL_GL_GetProcAddress('glBindProgramARB');
    if not Assigned(glBindProgramARB) then Exit;
    @glDeleteProgramsARB := SDL_GL_GetProcAddress('glDeleteProgramsARB');
    if not Assigned(glDeleteProgramsARB) then Exit;
    @glGenProgramsARB := SDL_GL_GetProcAddress('glGenProgramsARB');
    if not Assigned(glGenProgramsARB) then Exit;
    @glProgramEnvParameter4dARB := SDL_GL_GetProcAddress('glProgramEnvParameter4dARB');
    if not Assigned(glProgramEnvParameter4dARB) then Exit;
    @glProgramEnvParameter4dvARB := SDL_GL_GetProcAddress('glProgramEnvParameter4dvARB');
    if not Assigned(glProgramEnvParameter4dvARB) then Exit;
    @glProgramEnvParameter4fARB := SDL_GL_GetProcAddress('glProgramEnvParameter4fARB');
    if not Assigned(glProgramEnvParameter4fARB) then Exit;
    @glProgramEnvParameter4fvARB := SDL_GL_GetProcAddress('glProgramEnvParameter4fvARB');
    if not Assigned(glProgramEnvParameter4fvARB) then Exit;
    @glProgramLocalParameter4dARB := SDL_GL_GetProcAddress('glProgramLocalParameter4dARB');
    if not Assigned(glProgramLocalParameter4dARB) then Exit;
    @glProgramLocalParameter4dvARB := SDL_GL_GetProcAddress('glProgramLocalParameter4dvARB');
    if not Assigned(glProgramLocalParameter4dvARB) then Exit;
    @glProgramLocalParameter4fARB := SDL_GL_GetProcAddress('glProgramLocalParameter4fARB');
    if not Assigned(glProgramLocalParameter4fARB) then Exit;
    @glProgramLocalParameter4fvARB := SDL_GL_GetProcAddress('glProgramLocalParameter4fvARB');
    if not Assigned(glProgramLocalParameter4fvARB) then Exit;
    @glGetProgramEnvParameterdvARB := SDL_GL_GetProcAddress('glGetProgramEnvParameterdvARB');
    if not Assigned(glGetProgramEnvParameterdvARB) then Exit;
    @glGetProgramEnvParameterfvARB := SDL_GL_GetProcAddress('glGetProgramEnvParameterfvARB');
    if not Assigned(glGetProgramEnvParameterfvARB) then Exit;
    @glGetProgramLocalParameterdvARB := SDL_GL_GetProcAddress('glGetProgramLocalParameterdvARB');
    if not Assigned(glGetProgramLocalParameterdvARB) then Exit;
    @glGetProgramLocalParameterfvARB := SDL_GL_GetProcAddress('glGetProgramLocalParameterfvARB');
    if not Assigned(glGetProgramLocalParameterfvARB) then Exit;
    @glGetProgramivARB := SDL_GL_GetProcAddress('glGetProgramivARB');
    if not Assigned(glGetProgramivARB) then Exit;
    @glGetProgramStringARB := SDL_GL_GetProcAddress('glGetProgramStringARB');
    if not Assigned(glGetProgramStringARB) then Exit;
    @glGetVertexAttribdvARB := SDL_GL_GetProcAddress('glGetVertexAttribdvARB');
    if not Assigned(glGetVertexAttribdvARB) then Exit;
    @glGetVertexAttribfvARB := SDL_GL_GetProcAddress('glGetVertexAttribfvARB');
    if not Assigned(glGetVertexAttribfvARB) then Exit;
    @glGetVertexAttribivARB := SDL_GL_GetProcAddress('glGetVertexAttribivARB');
    if not Assigned(glGetVertexAttribivARB) then Exit;
    @glGetVertexAttribPointervARB := SDL_GL_GetProcAddress('glGetVertexAttribPointervARB');
    if not Assigned(glGetVertexAttribPointervARB) then Exit;
    @glIsProgramARB := SDL_GL_GetProcAddress('glIsProgramARB');
    if not Assigned(glIsProgramARB) then Exit;
    Result := TRUE;
  end;

end;

function Load_GL_ARB_window_pos: Boolean;
var
  extstring : PChar;
begin

  Result := FALSE;
  extstring := glGetString( GL_EXTENSIONS );

  if glext_ExtensionSupported('GL_ARB_window_pos', extstring) then
  begin
    @glWindowPos2dARB := SDL_GL_GetProcAddress('glWindowPos2dARB');
    if not Assigned(glWindowPos2dARB) then Exit;
    @glWindowPos2fARB := SDL_GL_GetProcAddress('glWindowPos2fARB');
    if not Assigned(glWindowPos2fARB) then Exit;
    @glWindowPos2iARB := SDL_GL_GetProcAddress('glWindowPos2iARB');
    if not Assigned(glWindowPos2iARB) then Exit;
    @glWindowPos2sARB := SDL_GL_GetProcAddress('glWindowPos2sARB');
    if not Assigned(glWindowPos2sARB) then Exit;
    @glWindowPos2dvARB := SDL_GL_GetProcAddress('glWindowPos2dvARB');
    if not Assigned(glWindowPos2dvARB) then Exit;
    @glWindowPos2fvARB := SDL_GL_GetProcAddress('glWindowPos2fvARB');
    if not Assigned(glWindowPos2fvARB) then Exit;
    @glWindowPos2ivARB := SDL_GL_GetProcAddress('glWindowPos2ivARB');
    if not Assigned(glWindowPos2ivARB) then Exit;
    @glWindowPos2svARB := SDL_GL_GetProcAddress('glWindowPos2svARB');
    if not Assigned(glWindowPos2svARB) then Exit;
    @glWindowPos3dARB := SDL_GL_GetProcAddress('glWindowPos3dARB');
    if not Assigned(glWindowPos3dARB) then Exit;
    @glWindowPos3fARB := SDL_GL_GetProcAddress('glWindowPos3fARB');
    if not Assigned(glWindowPos3fARB) then Exit;
    @glWindowPos3iARB := SDL_GL_GetProcAddress('glWindowPos3iARB');
    if not Assigned(glWindowPos3iARB) then Exit;
    @glWindowPos3sARB := SDL_GL_GetProcAddress('glWindowPos3sARB');
    if not Assigned(glWindowPos3sARB) then Exit;
    @glWindowPos3dvARB := SDL_GL_GetProcAddress('glWindowPos3dvARB');
    if not Assigned(glWindowPos3dvARB) then Exit;
    @glWindowPos3fvARB := SDL_GL_GetProcAddress('glWindowPos3fvARB');
    if not Assigned(glWindowPos3fvARB) then Exit;
    @glWindowPos3ivARB := SDL_GL_GetProcAddress('glWindowPos3ivARB');
    if not Assigned(glWindowPos3ivARB) then Exit;
    @glWindowPos3svARB := SDL_GL_GetProcAddress('glWindowPos3svARB');
    if not Assigned(glWindowPos3svARB) then Exit;
    Result := TRUE;
  end;

end;

function Load_GL_EXT_422_pixels: Boolean;
var
  extstring : PChar;
begin

  Result := FALSE;
  extstring := glGetString( GL_EXTENSIONS );

  if glext_ExtensionSupported('GL_EXT_422_pixels', extstring) then
  begin
    Result := TRUE;
  end;

end;

function Load_GL_EXT_abgr: Boolean;
var
  extstring : PChar;
begin

  Result := FALSE;
  extstring := glGetString( GL_EXTENSIONS );

  if glext_ExtensionSupported('GL_EXT_abgr', extstring) then
  begin
    Result := TRUE;
  end;

end;

function Load_GL_EXT_bgra: Boolean;
var
  extstring : PChar;
begin

  Result := FALSE;
  extstring := glGetString( GL_EXTENSIONS );

  if glext_ExtensionSupported('GL_EXT_bgra', extstring) then
  begin
    Result := TRUE;
  end;

end;

function Load_GL_EXT_blend_color: Boolean;
var
  extstring : PChar;
begin

  Result := FALSE;
  extstring := glGetString( GL_EXTENSIONS );

  if glext_ExtensionSupported('GL_EXT_blend_color', extstring) then
  begin
    @glBlendColorEXT := SDL_GL_GetProcAddress('glBlendColorEXT');
    if not Assigned(glBlendColorEXT) then Exit;
    Result := TRUE;
  end;

end;

function Load_GL_EXT_blend_func_separate: Boolean;
var
  extstring : PChar;
begin

  Result := FALSE;
  extstring := glGetString( GL_EXTENSIONS );

  if glext_ExtensionSupported('GL_EXT_blend_func_separate', extstring) then
  begin
    @glBlendFuncSeparateEXT := SDL_GL_GetProcAddress('glBlendFuncSeparateEXT');
    if not Assigned(glBlendFuncSeparateEXT) then Exit;
    Result := TRUE;
  end;

end;

function Load_GL_EXT_blend_logic_op: Boolean;
var
  extstring : PChar;
begin

  Result := FALSE;
  extstring := glGetString( GL_EXTENSIONS );

  if glext_ExtensionSupported('GL_EXT_blend_logic_op', extstring) then
  begin
    Result := TRUE;
  end;

end;

function Load_GL_EXT_blend_minmax: Boolean;
var
  extstring : PChar;
begin

  Result := FALSE;
  extstring := glGetString( GL_EXTENSIONS );

  if glext_ExtensionSupported('GL_EXT_blend_minmax', extstring) then
  begin
    @glBlendEquationEXT := SDL_GL_GetProcAddress('glBlendEquationEXT');
    if not Assigned(glBlendEquationEXT) then Exit;
    Result := TRUE;
  end;

end;

function Load_GL_EXT_blend_subtract: Boolean;
var
  extstring : PChar;
begin

  Result := FALSE;
  extstring := glGetString( GL_EXTENSIONS );

  if glext_ExtensionSupported('GL_EXT_blend_subtract', extstring) then
  begin
    Result := TRUE;
  end;

end;

function Load_GL_EXT_clip_volume_hint: Boolean;
var
  extstring : PChar;
begin

  Result := FALSE;
  extstring := glGetString( GL_EXTENSIONS );

  if glext_ExtensionSupported('GL_EXT_clip_volume_hint', extstring) then
  begin
    Result := TRUE;
  end;

end;

function Load_GL_EXT_color_subtable: Boolean;
var
  extstring : PChar;
begin

  Result := FALSE;
  extstring := glGetString( GL_EXTENSIONS );

  if glext_ExtensionSupported('GL_EXT_color_subtable', extstring) then
  begin
    @glColorSubTableEXT := SDL_GL_GetProcAddress('glColorSubTableEXT');
    if not Assigned(glColorSubTableEXT) then Exit;
    @glCopyColorSubTableEXT := SDL_GL_GetProcAddress('glCopyColorSubTableEXT');
    if not Assigned(glCopyColorSubTableEXT) then Exit;
    Result := TRUE;
  end;

end;

function Load_GL_EXT_compiled_vertex_array: Boolean;
var
  extstring : PChar;
begin

  Result := FALSE;
  extstring := glGetString( GL_EXTENSIONS );

  if glext_ExtensionSupported('GL_EXT_compiled_vertex_array', extstring) then
  begin
    @glLockArraysEXT := SDL_GL_GetProcAddress('glLockArraysEXT');
    if not Assigned(glLockArraysEXT) then Exit;
    @glUnlockArraysEXT := SDL_GL_GetProcAddress('glUnlockArraysEXT');
    if not Assigned(glUnlockArraysEXT) then Exit;
    Result := TRUE;
  end;

end;

function Load_GL_EXT_convolution: Boolean;
var
  extstring : PChar;
begin

  Result := FALSE;
  extstring := glGetString( GL_EXTENSIONS );

  if glext_ExtensionSupported('GL_EXT_convolution', extstring) then
  begin
    @glConvolutionFilter1DEXT := SDL_GL_GetProcAddress('glConvolutionFilter1DEXT');
    if not Assigned(glConvolutionFilter1DEXT) then Exit;
    @glConvolutionFilter2DEXT := SDL_GL_GetProcAddress('glConvolutionFilter2DEXT');
    if not Assigned(glConvolutionFilter2DEXT) then Exit;
    @glCopyConvolutionFilter1DEXT := SDL_GL_GetProcAddress('glCopyConvolutionFilter1DEXT');
    if not Assigned(glCopyConvolutionFilter1DEXT) then Exit;
    @glCopyConvolutionFilter2DEXT := SDL_GL_GetProcAddress('glCopyConvolutionFilter2DEXT');
    if not Assigned(glCopyConvolutionFilter2DEXT) then Exit;
    @glGetConvolutionFilterEXT := SDL_GL_GetProcAddress('glGetConvolutionFilterEXT');
    if not Assigned(glGetConvolutionFilterEXT) then Exit;
    @glSeparableFilter2DEXT := SDL_GL_GetProcAddress('glSeparableFilter2DEXT');
    if not Assigned(glSeparableFilter2DEXT) then Exit;
    @glGetSeparableFilterEXT := SDL_GL_GetProcAddress('glGetSeparableFilterEXT');
    if not Assigned(glGetSeparableFilterEXT) then Exit;
    @glConvolutionParameteriEXT := SDL_GL_GetProcAddress('glConvolutionParameteriEXT');
    if not Assigned(glConvolutionParameteriEXT) then Exit;
    @glConvolutionParameterivEXT := SDL_GL_GetProcAddress('glConvolutionParameterivEXT');
    if not Assigned(glConvolutionParameterivEXT) then Exit;
    @glConvolutionParameterfEXT := SDL_GL_GetProcAddress('glConvolutionParameterfEXT');
    if not Assigned(glConvolutionParameterfEXT) then Exit;
    @glConvolutionParameterfvEXT := SDL_GL_GetProcAddress('glConvolutionParameterfvEXT');
    if not Assigned(glConvolutionParameterfvEXT) then Exit;
    @glGetConvolutionParameterivEXT := SDL_GL_GetProcAddress('glGetConvolutionParameterivEXT');
    if not Assigned(glGetConvolutionParameterivEXT) then Exit;
    @glGetConvolutionParameterfvEXT := SDL_GL_GetProcAddress('glGetConvolutionParameterfvEXT');
    if not Assigned(glGetConvolutionParameterfvEXT) then Exit;
    Result := TRUE;
  end;

end;

function Load_GL_EXT_histogram: Boolean;
var
  extstring : PChar;
begin

  Result := FALSE;
  extstring := glGetString( GL_EXTENSIONS );

  if glext_ExtensionSupported('GL_EXT_histogram', extstring) then
  begin
    @glHistogramEXT := SDL_GL_GetProcAddress('glHistogramEXT');
    if not Assigned(glHistogramEXT) then Exit;
    @glResetHistogramEXT := SDL_GL_GetProcAddress('glResetHistogramEXT');
    if not Assigned(glResetHistogramEXT) then Exit;
    @glGetHistogramEXT := SDL_GL_GetProcAddress('glGetHistogramEXT');
    if not Assigned(glGetHistogramEXT) then Exit;
    @glGetHistogramParameterivEXT := SDL_GL_GetProcAddress('glGetHistogramParameterivEXT');
    if not Assigned(glGetHistogramParameterivEXT) then Exit;
    @glGetHistogramParameterfvEXT := SDL_GL_GetProcAddress('glGetHistogramParameterfvEXT');
    if not Assigned(glGetHistogramParameterfvEXT) then Exit;
    @glMinmaxEXT := SDL_GL_GetProcAddress('glMinmaxEXT');
    if not Assigned(glMinmaxEXT) then Exit;
    @glResetMinmaxEXT := SDL_GL_GetProcAddress('glResetMinmaxEXT');
    if not Assigned(glResetMinmaxEXT) then Exit;
    @glGetMinmaxEXT := SDL_GL_GetProcAddress('glGetMinmaxEXT');
    if not Assigned(glGetMinmaxEXT) then Exit;
    @glGetMinmaxParameterivEXT := SDL_GL_GetProcAddress('glGetMinmaxParameterivEXT');
    if not Assigned(glGetMinmaxParameterivEXT) then Exit;
    @glGetMinmaxParameterfvEXT := SDL_GL_GetProcAddress('glGetMinmaxParameterfvEXT');
    if not Assigned(glGetMinmaxParameterfvEXT) then Exit;
    Result := TRUE;
  end;

end;

function Load_GL_EXT_multi_draw_arrays: Boolean;
var
  extstring : PChar;
begin

  Result := FALSE;
  extstring := glGetString( GL_EXTENSIONS );

  if glext_ExtensionSupported('GL_EXT_multi_draw_arrays', extstring) then
  begin
    @glMultiDrawArraysEXT := SDL_GL_GetProcAddress('glMultiDrawArraysEXT');
    if not Assigned(glMultiDrawArraysEXT) then Exit;
    @glMultiDrawElementsEXT := SDL_GL_GetProcAddress('glMultiDrawElementsEXT');
    if not Assigned(glMultiDrawElementsEXT) then Exit;
    Result := TRUE;
  end;

end;

function Load_GL_EXT_packed_pixels: Boolean;
var
  extstring : PChar;
begin

  Result := FALSE;
  extstring := glGetString( GL_EXTENSIONS );

  if glext_ExtensionSupported('GL_EXT_packed_pixels', extstring) then
  begin
    Result := TRUE;
  end;

end;

function Load_GL_EXT_paletted_texture: Boolean;
var
  extstring : PChar;
begin

  Result := FALSE;
  extstring := glGetString( GL_EXTENSIONS );

  if glext_ExtensionSupported('GL_EXT_paletted_texture', extstring) then
  begin
    @glColorTableEXT := SDL_GL_GetProcAddress('glColorTableEXT');
    if not Assigned(glColorTableEXT) then Exit;
    @glColorSubTableEXT := SDL_GL_GetProcAddress('glColorSubTableEXT');
    if not Assigned(glColorSubTableEXT) then Exit;
    @glGetColorTableEXT := SDL_GL_GetProcAddress('glGetColorTableEXT');
    if not Assigned(glGetColorTableEXT) then Exit;
    @glGetColorTableParameterivEXT := SDL_GL_GetProcAddress('glGetColorTableParameterivEXT');
    if not Assigned(glGetColorTableParameterivEXT) then Exit;
    @glGetColorTableParameterfvEXT := SDL_GL_GetProcAddress('glGetColorTableParameterfvEXT');
    if not Assigned(glGetColorTableParameterfvEXT) then Exit;
    Result := TRUE;
  end;

end;

function Load_GL_EXT_point_parameters: Boolean;
var
  extstring : PChar;
begin

  Result := FALSE;
  extstring := glGetString( GL_EXTENSIONS );

  if glext_ExtensionSupported('GL_EXT_point_parameters', extstring) then
  begin
    @glPointParameterfEXT := SDL_GL_GetProcAddress('glPointParameterfEXT');
    if not Assigned(glPointParameterfEXT) then Exit;
    @glPointParameterfvEXT := SDL_GL_GetProcAddress('glPointParameterfvEXT');
    if not Assigned(glPointParameterfvEXT) then Exit;
    Result := TRUE;
  end;

end;

function Load_GL_EXT_polygon_offset: Boolean;
var
  extstring : PChar;
begin

  Result := FALSE;
  extstring := glGetString( GL_EXTENSIONS );

  if glext_ExtensionSupported('GL_EXT_polygon_offset', extstring) then
  begin
    @glPolygonOffsetEXT := SDL_GL_GetProcAddress('glPolygonOffsetEXT');
    if not Assigned(glPolygonOffsetEXT) then Exit;
    Result := TRUE;
  end;

end;

function Load_GL_EXT_separate_specular_color: Boolean;
var
  extstring : PChar;
begin

  Result := FALSE;
  extstring := glGetString( GL_EXTENSIONS );

  if glext_ExtensionSupported('GL_EXT_separate_specular_color', extstring) then
  begin
    Result := TRUE;
  end;

end;

function Load_GL_EXT_shadow_funcs: Boolean;
var
  extstring : PChar;
begin

  Result := FALSE;
  extstring := glGetString( GL_EXTENSIONS );

  if glext_ExtensionSupported('GL_EXT_shadow_funcs', extstring) then
  begin
    Result := TRUE;
  end;

end;

function Load_GL_EXT_shared_texture_palette: Boolean;
var
  extstring : PChar;
begin

  Result := FALSE;
  extstring := glGetString( GL_EXTENSIONS );

  if glext_ExtensionSupported('GL_EXT_shared_texture_palette', extstring) then
  begin
    Result := TRUE;
  end;

end;

function Load_GL_EXT_stencil_two_side: Boolean;
var
  extstring : PChar;
begin

  Result := FALSE;
  extstring := glGetString( GL_EXTENSIONS );

  if glext_ExtensionSupported('GL_EXT_stencil_two_side', extstring) then
  begin
    @glActiveStencilFaceEXT := SDL_GL_GetProcAddress('glActiveStencilFaceEXT');
    if not Assigned(glActiveStencilFaceEXT) then Exit;
    Result := TRUE;
  end;

end;

function Load_GL_EXT_stencil_wrap: Boolean;
var
  extstring : PChar;
begin

  Result := FALSE;
  extstring := glGetString( GL_EXTENSIONS );

  if glext_ExtensionSupported('GL_EXT_stencil_wrap', extstring) then
  begin
    Result := TRUE;
  end;

end;

function Load_GL_EXT_subtexture: Boolean;
var
  extstring : PChar;
begin

  Result := FALSE;
  extstring := glGetString( GL_EXTENSIONS );

  if glext_ExtensionSupported('GL_EXT_subtexture', extstring) then
  begin
    @glTexSubImage1DEXT := SDL_GL_GetProcAddress('glTexSubImage1DEXT');
    if not Assigned(glTexSubImage1DEXT) then Exit;
    @glTexSubImage2DEXT := SDL_GL_GetProcAddress('glTexSubImage2DEXT');
    if not Assigned(glTexSubImage2DEXT) then Exit;
    @glTexSubImage3DEXT := SDL_GL_GetProcAddress('glTexSubImage3DEXT');
    if not Assigned(glTexSubImage3DEXT) then Exit;
    Result := TRUE;
  end;

end;

function Load_GL_EXT_texture3D: Boolean;
var
  extstring : PChar;
begin

  Result := FALSE;
  extstring := glGetString( GL_EXTENSIONS );

  if glext_ExtensionSupported('GL_EXT_texture3D', extstring) then
  begin
    glTexImage3DEXT := SDL_GL_GetProcAddress('glTexImage3DEXT');
    if not Assigned(glTexImage3DEXT) then Exit;
    Result := TRUE;
  end;

end;

function Load_GL_EXT_texture_compression_s3tc: Boolean;
var
  extstring : PChar;
begin

  Result := FALSE;
  extstring := glGetString( GL_EXTENSIONS );

  if glext_ExtensionSupported('GL_EXT_texture_compression_s3tc', extstring) then
  begin
    Result := TRUE;
  end;

end;

function Load_GL_EXT_texture_env_add: Boolean;
var
  extstring : PChar;
begin

  Result := FALSE;
  extstring := glGetString( GL_EXTENSIONS );

  if glext_ExtensionSupported('GL_EXT_texture_env_add', extstring) then
  begin
    Result := TRUE;
  end;

end;

function Load_GL_EXT_texture_env_combine: Boolean;
var
  extstring : PChar;
begin

  Result := FALSE;
  extstring := glGetString( GL_EXTENSIONS );

  if glext_ExtensionSupported('GL_EXT_texture_env_combine', extstring) then
  begin
    Result := TRUE;
  end;

end;

function Load_GL_EXT_texture_env_dot3: Boolean;
var
  extstring : PChar;
begin

  Result := FALSE;
  extstring := glGetString( GL_EXTENSIONS );

  if glext_ExtensionSupported('GL_EXT_texture_env_dot3', extstring) then
  begin
    Result := TRUE;
  end;

end;

function Load_GL_EXT_texture_filter_anisotropic: Boolean;
var
  extstring : PChar;
begin

  Result := FALSE;
  extstring := glGetString( GL_EXTENSIONS );

  if glext_ExtensionSupported('GL_EXT_texture_filter_anisotropic', extstring) then
  begin
    Result := TRUE;
  end;

end;

function Load_GL_EXT_texture_lod_bias: Boolean;
var
  extstring : PChar;
begin

  Result := FALSE;
  extstring := glGetString( GL_EXTENSIONS );

  if glext_ExtensionSupported('GL_EXT_texture_lod_bias', extstring) then
  begin
    Result := TRUE;
  end;

end;

function Load_GL_EXT_texture_object: Boolean;
var
  extstring : PChar;
begin

  Result := FALSE;
  extstring := glGetString( GL_EXTENSIONS );

  if glext_ExtensionSupported('GL_EXT_texture_object', extstring) then
  begin
    @glGenTexturesEXT := SDL_GL_GetProcAddress('glGenTexturesEXT');
    if not Assigned(glGenTexturesEXT) then Exit;
    @glDeleteTexturesEXT := SDL_GL_GetProcAddress('glDeleteTexturesEXT');
    if not Assigned(glDeleteTexturesEXT) then Exit;
    @glBindTextureEXT := SDL_GL_GetProcAddress('glBindTextureEXT');
    if not Assigned(glBindTextureEXT) then Exit;
    @glPrioritizeTexturesEXT := SDL_GL_GetProcAddress('glPrioritizeTexturesEXT');
    if not Assigned(glPrioritizeTexturesEXT) then Exit;
    @glAreTexturesResidentEXT := SDL_GL_GetProcAddress('glAreTexturesResidentEXT');
    if not Assigned(glAreTexturesResidentEXT) then Exit;
    @glIsTextureEXT := SDL_GL_GetProcAddress('glIsTextureEXT');
    if not Assigned(glIsTextureEXT) then Exit;
    Result := TRUE;
  end;

end;

function Load_GL_EXT_vertex_array: Boolean;
var
  extstring : PChar;
begin

  Result := FALSE;
  extstring := glGetString( GL_EXTENSIONS );

  if glext_ExtensionSupported('GL_EXT_vertex_array', extstring) then
  begin
    @glArrayElementEXT := SDL_GL_GetProcAddress('glArrayElementEXT');
    if not Assigned(glArrayElementEXT) then Exit;
    @glDrawArraysEXT := SDL_GL_GetProcAddress('glDrawArraysEXT');
    if not Assigned(glDrawArraysEXT) then Exit;
    @glVertexPointerEXT := SDL_GL_GetProcAddress('glVertexPointerEXT');
    if not Assigned(glVertexPointerEXT) then Exit;
    @glNormalPointerEXT := SDL_GL_GetProcAddress('glNormalPointerEXT');
    if not Assigned(glNormalPointerEXT) then Exit;
    @glColorPointerEXT := SDL_GL_GetProcAddress('glColorPointerEXT');
    if not Assigned(glColorPointerEXT) then Exit;
    @glIndexPointerEXT := SDL_GL_GetProcAddress('glIndexPointerEXT');
    if not Assigned(glIndexPointerEXT) then Exit;
    @glTexCoordPointerEXT := SDL_GL_GetProcAddress('glTexCoordPointerEXT');
    if not Assigned(glTexCoordPointerEXT) then Exit;
    @glEdgeFlagPointerEXT := SDL_GL_GetProcAddress('glEdgeFlagPointerEXT');
    if not Assigned(glEdgeFlagPointerEXT) then Exit;
    @glGetPointervEXT := SDL_GL_GetProcAddress('glGetPointervEXT');
    if not Assigned(glGetPointervEXT) then Exit;
    Result := TRUE;
  end;

end;

function Load_GL_EXT_vertex_shader: Boolean;
var
  extstring : PChar;
begin

  Result := FALSE;
  extstring := glGetString( GL_EXTENSIONS );

  if glext_ExtensionSupported('GL_EXT_vertex_shader', extstring) then
  begin
    @glBeginVertexShaderEXT := SDL_GL_GetProcAddress('glBeginVertexShaderEXT');
    if not Assigned(glBeginVertexShaderEXT) then Exit;
    @glEndVertexShaderEXT := SDL_GL_GetProcAddress('glEndVertexShaderEXT');
    if not Assigned(glEndVertexShaderEXT) then Exit;
    @glBindVertexShaderEXT := SDL_GL_GetProcAddress('glBindVertexShaderEXT');
    if not Assigned(glBindVertexShaderEXT) then Exit;
    @glGenVertexShadersEXT := SDL_GL_GetProcAddress('glGenVertexShadersEXT');
    if not Assigned(glGenVertexShadersEXT) then Exit;
    @glDeleteVertexShaderEXT := SDL_GL_GetProcAddress('glDeleteVertexShaderEXT');
    if not Assigned(glDeleteVertexShaderEXT) then Exit;
    @glShaderOp1EXT := SDL_GL_GetProcAddress('glShaderOp1EXT');
    if not Assigned(glShaderOp1EXT) then Exit;
    @glShaderOp2EXT := SDL_GL_GetProcAddress('glShaderOp2EXT');
    if not Assigned(glShaderOp2EXT) then Exit;
    @glShaderOp3EXT := SDL_GL_GetProcAddress('glShaderOp3EXT');
    if not Assigned(glShaderOp3EXT) then Exit;
    @glSwizzleEXT := SDL_GL_GetProcAddress('glSwizzleEXT');
    if not Assigned(glSwizzleEXT) then Exit;
    @glWriteMaskEXT := SDL_GL_GetProcAddress('glWriteMaskEXT');
    if not Assigned(glWriteMaskEXT) then Exit;
    @glInsertComponentEXT := SDL_GL_GetProcAddress('glInsertComponentEXT');
    if not Assigned(glInsertComponentEXT) then Exit;
    @glExtractComponentEXT := SDL_GL_GetProcAddress('glExtractComponentEXT');
    if not Assigned(glExtractComponentEXT) then Exit;
    @glGenSymbolsEXT := SDL_GL_GetProcAddress('glGenSymbolsEXT');
    if not Assigned(glGenSymbolsEXT) then Exit;
    @glSetInvariantEXT := SDL_GL_GetProcAddress('glSetInvariantEXT');
    if not Assigned(glSetInvariantEXT) then Exit;
    @glSetLocalConstantEXT := SDL_GL_GetProcAddress('glSetLocalConstantEXT');
    if not Assigned(glSetLocalConstantEXT) then Exit;
    @glVariantbvEXT := SDL_GL_GetProcAddress('glVariantbvEXT');
    if not Assigned(glVariantbvEXT) then Exit;
    @glVariantsvEXT := SDL_GL_GetProcAddress('glVariantsvEXT');
    if not Assigned(glVariantsvEXT) then Exit;
    @glVariantivEXT := SDL_GL_GetProcAddress('glVariantivEXT');
    if not Assigned(glVariantivEXT) then Exit;
    @glVariantfvEXT := SDL_GL_GetProcAddress('glVariantfvEXT');
    if not Assigned(glVariantfvEXT) then Exit;
    @glVariantdvEXT := SDL_GL_GetProcAddress('glVariantdvEXT');
    if not Assigned(glVariantdvEXT) then Exit;
    @glVariantubvEXT := SDL_GL_GetProcAddress('glVariantubvEXT');
    if not Assigned(glVariantubvEXT) then Exit;
    @glVariantusvEXT := SDL_GL_GetProcAddress('glVariantusvEXT');
    if not Assigned(glVariantusvEXT) then Exit;
    @glVariantuivEXT := SDL_GL_GetProcAddress('glVariantuivEXT');
    if not Assigned(glVariantuivEXT) then Exit;
    @glVariantPointerEXT := SDL_GL_GetProcAddress('glVariantPointerEXT');
    if not Assigned(glVariantPointerEXT) then Exit;
    @glEnableVariantClientStateEXT := SDL_GL_GetProcAddress('glEnableVariantClientStateEXT');
    if not Assigned(glEnableVariantClientStateEXT) then Exit;
    @glDisableVariantClientStateEXT := SDL_GL_GetProcAddress('glDisableVariantClientStateEXT');
    if not Assigned(glDisableVariantClientStateEXT) then Exit;
    @glBindLightParameterEXT := SDL_GL_GetProcAddress('glBindLightParameterEXT');
    if not Assigned(glBindLightParameterEXT) then Exit;
    @glBindMaterialParameterEXT := SDL_GL_GetProcAddress('glBindMaterialParameterEXT');
    if not Assigned(glBindMaterialParameterEXT) then Exit;
    @glBindTexGenParameterEXT := SDL_GL_GetProcAddress('glBindTexGenParameterEXT');
    if not Assigned(glBindTexGenParameterEXT) then Exit;
    @glBindTextureUnitParameterEXT := SDL_GL_GetProcAddress('glBindTextureUnitParameterEXT');
    if not Assigned(glBindTextureUnitParameterEXT) then Exit;
    @glBindParameterEXT := SDL_GL_GetProcAddress('glBindParameterEXT');
    if not Assigned(glBindParameterEXT) then Exit;
    @glIsVariantEnabledEXT := SDL_GL_GetProcAddress('glIsVariantEnabledEXT');
    if not Assigned(glIsVariantEnabledEXT) then Exit;
    @glGetVariantBooleanvEXT := SDL_GL_GetProcAddress('glGetVariantBooleanvEXT');
    if not Assigned(glGetVariantBooleanvEXT) then Exit;
    @glGetVariantIntegervEXT := SDL_GL_GetProcAddress('glGetVariantIntegervEXT');
    if not Assigned(glGetVariantIntegervEXT) then Exit;
    @glGetVariantFloatvEXT := SDL_GL_GetProcAddress('glGetVariantFloatvEXT');
    if not Assigned(glGetVariantFloatvEXT) then Exit;
    @glGetVariantPointervEXT := SDL_GL_GetProcAddress('glGetVariantPointervEXT');
    if not Assigned(glGetVariantPointervEXT) then Exit;
    @glGetInvariantBooleanvEXT := SDL_GL_GetProcAddress('glGetInvariantBooleanvEXT');
    if not Assigned(glGetInvariantBooleanvEXT) then Exit;
    @glGetInvariantIntegervEXT := SDL_GL_GetProcAddress('glGetInvariantIntegervEXT');
    if not Assigned(glGetInvariantIntegervEXT) then Exit;
    @glGetInvariantFloatvEXT := SDL_GL_GetProcAddress('glGetInvariantFloatvEXT');
    if not Assigned(glGetInvariantFloatvEXT) then Exit;
    @glGetLocalConstantBooleanvEXT := SDL_GL_GetProcAddress('glGetLocalConstantBooleanvEXT');
    if not Assigned(glGetLocalConstantBooleanvEXT) then Exit;
    @glGetLocalConstantIntegervEXT := SDL_GL_GetProcAddress('glGetLocalConstantIntegervEXT');
    if not Assigned(glGetLocalConstantIntegervEXT) then Exit;
    @glGetLocalConstantFloatvEXT := SDL_GL_GetProcAddress('glGetLocalConstantFloatvEXT');
    if not Assigned(glGetLocalConstantFloatvEXT) then Exit;
    Result := TRUE;
  end;

end;

function Load_GL_EXT_vertex_weighting: Boolean;
var
  extstring : PChar;
begin

  Result := FALSE;
  extstring := glGetString( GL_EXTENSIONS );

  if glext_ExtensionSupported('GL_EXT_vertex_weighting', extstring) then
  begin
    @glVertexWeightfEXT := SDL_GL_GetProcAddress('glVertexWeightfEXT');
    if not Assigned(glVertexWeightfEXT) then Exit;
    @glVertexWeightfvEXT := SDL_GL_GetProcAddress('glVertexWeightfvEXT');
    if not Assigned(glVertexWeightfvEXT) then Exit;
    @glVertexWeightPointerEXT := SDL_GL_GetProcAddress('glVertexWeightPointerEXT');
    if not Assigned(glVertexWeightPointerEXT) then Exit;
    Result := TRUE;
  end;

end;

function Load_GL_HP_occlusion_test: Boolean;
var
  extstring : PChar;
begin

  Result := FALSE;
  extstring := glGetString( GL_EXTENSIONS );

  if glext_ExtensionSupported('GL_HP_occlusion_test', extstring) then
  begin
    Result := TRUE;
  end;

end;

function Load_GL_NV_blend_square: Boolean;
var
  extstring : PChar;
begin

  Result := FALSE;
  extstring := glGetString( GL_EXTENSIONS );

  if glext_ExtensionSupported('GL_NV_blend_square', extstring) then
  begin
    Result := TRUE;
  end;

end;

function Load_GL_NV_copy_depth_to_color: Boolean;
var
  extstring : PChar;
begin

  Result := FALSE;
  extstring := glGetString( GL_EXTENSIONS );

  if glext_ExtensionSupported('GL_NV_copy_depth_to_color', extstring) then
  begin
    Result := TRUE;
  end;

end;

function Load_GL_NV_depth_clamp: Boolean;
var
  extstring : PChar;
begin

  Result := FALSE;
  extstring := glGetString( GL_EXTENSIONS );

  if glext_ExtensionSupported('GL_NV_depth_clamp', extstring) then
  begin
    Result := TRUE;
  end;

end;

function Load_GL_NV_evaluators: Boolean;
var
  extstring : PChar;
begin

  Result := FALSE;
  extstring := glGetString( GL_EXTENSIONS );

  if glext_ExtensionSupported('GL_NV_evaluators', extstring) then
  begin
    @glMapControlPointsNV := SDL_GL_GetProcAddress('glMapControlPointsNV');
    if not Assigned(glMapControlPointsNV) then Exit;
    @glMapParameterivNV := SDL_GL_GetProcAddress('glMapParameterivNV');
    if not Assigned(glMapParameterivNV) then Exit;
    @glMapParameterfvNV := SDL_GL_GetProcAddress('glMapParameterfvNV');
    if not Assigned(glMapParameterfvNV) then Exit;
    @glGetMapControlPointsNV := SDL_GL_GetProcAddress('glGetMapControlPointsNV');
    if not Assigned(glGetMapControlPointsNV) then Exit;
    @glGetMapParameterivNV := SDL_GL_GetProcAddress('glGetMapParameterivNV');
    if not Assigned(glGetMapParameterivNV) then Exit;
    @glGetMapParameterfvNV := SDL_GL_GetProcAddress('glGetMapParameterfvNV');
    if not Assigned(glGetMapParameterfvNV) then Exit;
    @glGetMapAttribParameterivNV := SDL_GL_GetProcAddress('glGetMapAttribParameterivNV');
    if not Assigned(glGetMapAttribParameterivNV) then Exit;
    @glGetMapAttribParameterfvNV := SDL_GL_GetProcAddress('glGetMapAttribParameterfvNV');
    if not Assigned(glGetMapAttribParameterfvNV) then Exit;
    @glEvalMapsNV := SDL_GL_GetProcAddress('glEvalMapsNV');
    if not Assigned(glEvalMapsNV) then Exit;
    Result := TRUE;
  end;

end;

function Load_GL_NV_fence: Boolean;
var
  extstring : PChar;
begin

  Result := FALSE;
  extstring := glGetString( GL_EXTENSIONS );

  if glext_ExtensionSupported('GL_NV_fence', extstring) then
  begin
    @glGenFencesNV := SDL_GL_GetProcAddress('glGenFencesNV');
    if not Assigned(glGenFencesNV) then Exit;
    @glDeleteFencesNV := SDL_GL_GetProcAddress('glDeleteFencesNV');
    if not Assigned(glDeleteFencesNV) then Exit;
    @glSetFenceNV := SDL_GL_GetProcAddress('glSetFenceNV');
    if not Assigned(glSetFenceNV) then Exit;
    @glTestFenceNV := SDL_GL_GetProcAddress('glTestFenceNV');
    if not Assigned(glTestFenceNV) then Exit;
    @glFinishFenceNV := SDL_GL_GetProcAddress('glFinishFenceNV');
    if not Assigned(glFinishFenceNV) then Exit;
    @glIsFenceNV := SDL_GL_GetProcAddress('glIsFenceNV');
    if not Assigned(glIsFenceNV) then Exit;
    @glGetFenceivNV := SDL_GL_GetProcAddress('glGetFenceivNV');
    if not Assigned(glGetFenceivNV) then Exit;
    Result := TRUE;
  end;

end;

function Load_GL_NV_fog_distance: Boolean;
var
  extstring : PChar;
begin

  Result := FALSE;
  extstring := glGetString( GL_EXTENSIONS );

  if glext_ExtensionSupported('GL_NV_fog_distance', extstring) then
  begin
    Result := TRUE;
  end;

end;

function Load_GL_NV_light_max_exponent: Boolean;
var
  extstring : PChar;
begin

  Result := FALSE;
  extstring := glGetString( GL_EXTENSIONS );

  if glext_ExtensionSupported('GL_NV_light_max_exponent', extstring) then
  begin
    Result := TRUE;
  end;

end;

function Load_GL_NV_multisample_filter_hint: Boolean;
var
  extstring : PChar;
begin

  Result := FALSE;
  extstring := glGetString( GL_EXTENSIONS );

  if glext_ExtensionSupported('GL_NV_multisample_filter_hint', extstring) then
  begin
    Result := TRUE;
  end;

end;

function Load_GL_NV_occlusion_query: Boolean;
var
  extstring : PChar;
begin

  Result := FALSE;
  extstring := glGetString( GL_EXTENSIONS );

  if glext_ExtensionSupported('GL_NV_occlusion_query', extstring) then
  begin
    @glGenOcclusionQueriesNV := SDL_GL_GetProcAddress('glGenOcclusionQueriesNV');
    if not Assigned(glGenOcclusionQueriesNV) then Exit;
    @glDeleteOcclusionQueriesNV := SDL_GL_GetProcAddress('glDeleteOcclusionQueriesNV');
    if not Assigned(glDeleteOcclusionQueriesNV) then Exit;
    @glIsOcclusionQueryNV := SDL_GL_GetProcAddress('glIsOcclusionQueryNV');
    if not Assigned(glIsOcclusionQueryNV) then Exit;
    @glBeginOcclusionQueryNV := SDL_GL_GetProcAddress('glBeginOcclusionQueryNV');
    if not Assigned(glBeginOcclusionQueryNV) then Exit;
    @glEndOcclusionQueryNV := SDL_GL_GetProcAddress('glEndOcclusionQueryNV');
    if not Assigned(glEndOcclusionQueryNV) then Exit;
    @glGetOcclusionQueryivNV := SDL_GL_GetProcAddress('glGetOcclusionQueryivNV');
    if not Assigned(glGetOcclusionQueryivNV) then Exit;
    @glGetOcclusionQueryuivNV := SDL_GL_GetProcAddress('glGetOcclusionQueryuivNV');
    if not Assigned(glGetOcclusionQueryuivNV) then Exit;
    Result := TRUE;
  end;

end;

function Load_GL_NV_packed_depth_stencil: Boolean;
var
  extstring : PChar;
begin

  Result := FALSE;
  extstring := glGetString( GL_EXTENSIONS );

  if glext_ExtensionSupported('GL_NV_packed_depth_stencil', extstring) then
  begin
    Result := TRUE;
  end;

end;

function Load_GL_NV_point_sprite: Boolean;
var
  extstring : PChar;
begin

  Result := FALSE;
  extstring := glGetString( GL_EXTENSIONS );

  if glext_ExtensionSupported('GL_NV_point_sprite', extstring) then
  begin
    @glPointParameteriNV := SDL_GL_GetProcAddress('glPointParameteriNV');
    if not Assigned(glPointParameteriNV) then Exit;
    @glPointParameterivNV := SDL_GL_GetProcAddress('glPointParameterivNV');
    if not Assigned(glPointParameterivNV) then Exit;
    Result := TRUE;
  end;

end;

function Load_GL_NV_register_combiners: Boolean;
var
  extstring : PChar;
begin

  Result := FALSE;
  extstring := glGetString( GL_EXTENSIONS );

  if glext_ExtensionSupported('GL_NV_register_combiners', extstring) then
  begin
    @glCombinerParameterfvNV := SDL_GL_GetProcAddress('glCombinerParameterfvNV');
    if not Assigned(glCombinerParameterfvNV) then Exit;
    @glCombinerParameterivNV := SDL_GL_GetProcAddress('glCombinerParameterivNV');
    if not Assigned(glCombinerParameterivNV) then Exit;
    @glCombinerParameterfNV := SDL_GL_GetProcAddress('glCombinerParameterfNV');
    if not Assigned(glCombinerParameterfNV) then Exit;
    @glCombinerParameteriNV := SDL_GL_GetProcAddress('glCombinerParameteriNV');
    if not Assigned(glCombinerParameteriNV) then Exit;
    @glCombinerInputNV := SDL_GL_GetProcAddress('glCombinerInputNV');
    if not Assigned(glCombinerInputNV) then Exit;
    @glCombinerOutputNV := SDL_GL_GetProcAddress('glCombinerOutputNV');
    if not Assigned(glCombinerOutputNV) then Exit;
    @glFinalCombinerInputNV := SDL_GL_GetProcAddress('glFinalCombinerInputNV');
    if not Assigned(glFinalCombinerInputNV) then Exit;
    @glGetCombinerInputParameterfvNV := SDL_GL_GetProcAddress('glGetCombinerInputParameterfvNV');
    if not Assigned(glGetCombinerInputParameterfvNV) then Exit;
    @glGetCombinerInputParameterivNV := SDL_GL_GetProcAddress('glGetCombinerInputParameterivNV');
    if not Assigned(glGetCombinerInputParameterivNV) then Exit;
    @glGetCombinerOutputParameterfvNV := SDL_GL_GetProcAddress('glGetCombinerOutputParameterfvNV');
    if not Assigned(glGetCombinerOutputParameterfvNV) then Exit;
    @glGetCombinerOutputParameterivNV := SDL_GL_GetProcAddress('glGetCombinerOutputParameterivNV');
    if not Assigned(glGetCombinerOutputParameterivNV) then Exit;
    @glGetFinalCombinerInputParameterfvNV := SDL_GL_GetProcAddress('glGetFinalCombinerInputParameterfvNV');
    if not Assigned(glGetFinalCombinerInputParameterfvNV) then Exit;
    @glGetFinalCombinerInputParameterivNV := SDL_GL_GetProcAddress('glGetFinalCombinerInputParameterivNV');
    if not Assigned(glGetFinalCombinerInputParameterivNV) then Exit;
    Result := TRUE;
  end;

end;

function Load_GL_NV_register_combiners2: Boolean;
var
  extstring : PChar;
begin

  Result := FALSE;
  extstring := glGetString( GL_EXTENSIONS );

  if glext_ExtensionSupported('GL_NV_register_combiners2', extstring) then
  begin
    @glCombinerStageParameterfvNV := SDL_GL_GetProcAddress('glCombinerStageParameterfvNV');
    if not Assigned(glCombinerStageParameterfvNV) then Exit;
    @glGetCombinerStageParameterfvNV := SDL_GL_GetProcAddress('glGetCombinerStageParameterfvNV');
    if not Assigned(glGetCombinerStageParameterfvNV) then Exit;
    Result := TRUE;
  end;

end;

function Load_GL_NV_texgen_emboss: Boolean;
var
  extstring : PChar;
begin

  Result := FALSE;
  extstring := glGetString( GL_EXTENSIONS );

  if glext_ExtensionSupported('GL_NV_texgen_emboss', extstring) then
  begin
    Result := TRUE;
  end;

end;

function Load_GL_NV_texgen_reflection: Boolean;
var
  extstring : PChar;
begin

  Result := FALSE;
  extstring := glGetString( GL_EXTENSIONS );

  if glext_ExtensionSupported('GL_NV_texgen_reflection', extstring) then
  begin
    Result := TRUE;
  end;

end;

function Load_GL_NV_texture_compression_vtc: Boolean;
var
  extstring : PChar;
begin

  Result := FALSE;
  extstring := glGetString( GL_EXTENSIONS );

  if glext_ExtensionSupported('GL_NV_texture_compression_vtc', extstring) then
  begin
    Result := TRUE;
  end;

end;

function Load_GL_NV_texture_env_combine4: Boolean;
var
  extstring : PChar;
begin

  Result := FALSE;
  extstring := glGetString( GL_EXTENSIONS );

  if glext_ExtensionSupported('GL_NV_texture_env_combine4', extstring) then
  begin
    Result := TRUE;
  end;

end;

function Load_GL_NV_texture_rectangle: Boolean;
var
  extstring : PChar;
begin

  Result := FALSE;
  extstring := glGetString( GL_EXTENSIONS );

  if glext_ExtensionSupported('GL_NV_texture_rectangle', extstring) then
  begin
    Result := TRUE;
  end;

end;

function Load_GL_NV_texture_shader: Boolean;
var
  extstring : PChar;
begin

  Result := FALSE;
  extstring := glGetString( GL_EXTENSIONS );

  if glext_ExtensionSupported('GL_NV_texture_shader', extstring) then
  begin
    Result := TRUE;
  end;

end;

function Load_GL_NV_texture_shader2: Boolean;
var
  extstring : PChar;
begin

  Result := FALSE;
  extstring := glGetString( GL_EXTENSIONS );

  if glext_ExtensionSupported('GL_NV_texture_shader2', extstring) then
  begin
    Result := TRUE;
  end;

end;

function Load_GL_NV_texture_shader3: Boolean;
var
  extstring : PChar;
begin

  Result := FALSE;
  extstring := glGetString( GL_EXTENSIONS );

  if glext_ExtensionSupported('GL_NV_texture_shader3', extstring) then
  begin
    Result := TRUE;
  end;

end;

function Load_GL_NV_vertex_array_range: Boolean;
var
  extstring : PChar;
begin

  Result := FALSE;
  extstring := glGetString( GL_EXTENSIONS );

  if glext_ExtensionSupported('GL_NV_vertex_array_range', extstring) then
  begin
    @glVertexArrayRangeNV := SDL_GL_GetProcAddress('glVertexArrayRangeNV');
    if not Assigned(glVertexArrayRangeNV) then Exit;
    @glFlushVertexArrayRangeNV := SDL_GL_GetProcAddress('glFlushVertexArrayRangeNV');
    if not Assigned(glFlushVertexArrayRangeNV) then Exit;
    {$IFDEF WINDOWS}
    @wglAllocateMemoryNV := SDL_GL_GetProcAddress('wglAllocateMemoryNV');
    if not Assigned(wglAllocateMemoryNV) then Exit;
    @wglFreeMemoryNV := SDL_GL_GetProcAddress('wglFreeMemoryNV');
    if not Assigned(wglFreeMemoryNV) then Exit;
    {$ENDIF}
    Result := TRUE;
  end;

end;

function Load_GL_NV_vertex_array_range2: Boolean;
var
  extstring : PChar;
begin

  Result := FALSE;
  extstring := glGetString( GL_EXTENSIONS );

  if glext_ExtensionSupported('GL_NV_vertex_array_range2', extstring) then
  begin
    Result := TRUE;
  end;

end;

function Load_GL_NV_vertex_program: Boolean;
var
  extstring : PChar;
begin

  Result := FALSE;
  extstring := glGetString( GL_EXTENSIONS );

  if glext_ExtensionSupported('GL_NV_vertex_program', extstring) then
  begin
    @glBindProgramNV := SDL_GL_GetProcAddress('glBindProgramNV');
    if not Assigned(glBindProgramNV) then Exit;
    @glDeleteProgramsNV := SDL_GL_GetProcAddress('glDeleteProgramsNV');
    if not Assigned(glDeleteProgramsNV) then Exit;
    @glExecuteProgramNV := SDL_GL_GetProcAddress('glExecuteProgramNV');
    if not Assigned(glExecuteProgramNV) then Exit;
    @glGenProgramsNV := SDL_GL_GetProcAddress('glGenProgramsNV');
    if not Assigned(glGenProgramsNV) then Exit;
    @glAreProgramsResidentNV := SDL_GL_GetProcAddress('glAreProgramsResidentNV');
    if not Assigned(glAreProgramsResidentNV) then Exit;
    @glRequestResidentProgramsNV := SDL_GL_GetProcAddress('glRequestResidentProgramsNV');
    if not Assigned(glRequestResidentProgramsNV) then Exit;
    @glGetProgramParameterfvNV := SDL_GL_GetProcAddress('glGetProgramParameterfvNV');
    if not Assigned(glGetProgramParameterfvNV) then Exit;
    @glGetProgramParameterdvNV := SDL_GL_GetProcAddress('glGetProgramParameterdvNV');
    if not Assigned(glGetProgramParameterdvNV) then Exit;
    @glGetProgramivNV := SDL_GL_GetProcAddress('glGetProgramivNV');
    if not Assigned(glGetProgramivNV) then Exit;
    @glGetProgramStringNV := SDL_GL_GetProcAddress('glGetProgramStringNV');
    if not Assigned(glGetProgramStringNV) then Exit;
    @glGetTrackMatrixivNV := SDL_GL_GetProcAddress('glGetTrackMatrixivNV');
    if not Assigned(glGetTrackMatrixivNV) then Exit;
    @glGetVertexAttribdvNV := SDL_GL_GetProcAddress('glGetVertexAttribdvNV');
    if not Assigned(glGetVertexAttribdvNV) then Exit;
    @glGetVertexAttribfvNV := SDL_GL_GetProcAddress('glGetVertexAttribfvNV');
    if not Assigned(glGetVertexAttribfvNV) then Exit;
    @glGetVertexAttribivNV := SDL_GL_GetProcAddress('glGetVertexAttribivNV');
    if not Assigned(glGetVertexAttribivNV) then Exit;
    @glGetVertexAttribPointervNV := SDL_GL_GetProcAddress('glGetVertexAttribPointervNV');
    if not Assigned(glGetVertexAttribPointervNV) then Exit;
    @glIsProgramNV := SDL_GL_GetProcAddress('glIsProgramNV');
    if not Assigned(glIsProgramNV) then Exit;
    @glLoadProgramNV := SDL_GL_GetProcAddress('glLoadProgramNV');
    if not Assigned(glLoadProgramNV) then Exit;
    @glProgramParameter4fNV := SDL_GL_GetProcAddress('glProgramParameter4fNV');
    if not Assigned(glProgramParameter4fNV) then Exit;
    @glProgramParameter4fvNV := SDL_GL_GetProcAddress('glProgramParameter4fvNV');
    if not Assigned(glProgramParameter4fvNV) then Exit;
    @glProgramParameters4dvNV := SDL_GL_GetProcAddress('glProgramParameters4dvNV');
    if not Assigned(glProgramParameters4dvNV) then Exit;
    @glProgramParameters4fvNV := SDL_GL_GetProcAddress('glProgramParameters4fvNV');
    if not Assigned(glProgramParameters4fvNV) then Exit;
    @glTrackMatrixNV := SDL_GL_GetProcAddress('glTrackMatrixNV');
    if not Assigned(glTrackMatrixNV) then Exit;
    @glVertexAttribPointerNV := SDL_GL_GetProcAddress('glVertexAttribPointerNV');
    if not Assigned(glVertexAttribPointerNV) then Exit;
    @glVertexAttrib1sNV := SDL_GL_GetProcAddress('glVertexAttrib1sNV');
    if not Assigned(glVertexAttrib1sNV) then Exit;
    @glVertexAttrib1fNV := SDL_GL_GetProcAddress('glVertexAttrib1fNV');
    if not Assigned(glVertexAttrib1fNV) then Exit;
    @glVertexAttrib1dNV := SDL_GL_GetProcAddress('glVertexAttrib1dNV');
    if not Assigned(glVertexAttrib1dNV) then Exit;
    @glVertexAttrib2sNV := SDL_GL_GetProcAddress('glVertexAttrib2sNV');
    if not Assigned(glVertexAttrib2sNV) then Exit;
    @glVertexAttrib2fNV := SDL_GL_GetProcAddress('glVertexAttrib2fNV');
    if not Assigned(glVertexAttrib2fNV) then Exit;
    @glVertexAttrib2dNV := SDL_GL_GetProcAddress('glVertexAttrib2dNV');
    if not Assigned(glVertexAttrib2dNV) then Exit;
    @glVertexAttrib3sNV := SDL_GL_GetProcAddress('glVertexAttrib3sNV');
    if not Assigned(glVertexAttrib3sNV) then Exit;
    @glVertexAttrib3fNV := SDL_GL_GetProcAddress('glVertexAttrib3fNV');
    if not Assigned(glVertexAttrib3fNV) then Exit;
    @glVertexAttrib3dNV := SDL_GL_GetProcAddress('glVertexAttrib3dNV');
    if not Assigned(glVertexAttrib3dNV) then Exit;
    @glVertexAttrib4sNV := SDL_GL_GetProcAddress('glVertexAttrib4sNV');
    if not Assigned(glVertexAttrib4sNV) then Exit;
    @glVertexAttrib4fNV := SDL_GL_GetProcAddress('glVertexAttrib4fNV');
    if not Assigned(glVertexAttrib4fNV) then Exit;
    @glVertexAttrib4dNV := SDL_GL_GetProcAddress('glVertexAttrib4dNV');
    if not Assigned(glVertexAttrib4dNV) then Exit;
    @glVertexAttrib4ubNV := SDL_GL_GetProcAddress('glVertexAttrib4ubNV');
    if not Assigned(glVertexAttrib4ubNV) then Exit;
    @glVertexAttrib1svNV := SDL_GL_GetProcAddress('glVertexAttrib1svNV');
    if not Assigned(glVertexAttrib1svNV) then Exit;
    @glVertexAttrib1fvNV := SDL_GL_GetProcAddress('glVertexAttrib1fvNV');
    if not Assigned(glVertexAttrib1fvNV) then Exit;
    @glVertexAttrib1dvNV := SDL_GL_GetProcAddress('glVertexAttrib1dvNV');
    if not Assigned(glVertexAttrib1dvNV) then Exit;
    @glVertexAttrib2svNV := SDL_GL_GetProcAddress('glVertexAttrib2svNV');
    if not Assigned(glVertexAttrib2svNV) then Exit;
    @glVertexAttrib2fvNV := SDL_GL_GetProcAddress('glVertexAttrib2fvNV');
    if not Assigned(glVertexAttrib2fvNV) then Exit;
    @glVertexAttrib2dvNV := SDL_GL_GetProcAddress('glVertexAttrib2dvNV');
    if not Assigned(glVertexAttrib2dvNV) then Exit;
    @glVertexAttrib3svNV := SDL_GL_GetProcAddress('glVertexAttrib3svNV');
    if not Assigned(glVertexAttrib3svNV) then Exit;
    @glVertexAttrib3fvNV := SDL_GL_GetProcAddress('glVertexAttrib3fvNV');
    if not Assigned(glVertexAttrib3fvNV) then Exit;
    @glVertexAttrib3dvNV := SDL_GL_GetProcAddress('glVertexAttrib3dvNV');
    if not Assigned(glVertexAttrib3dvNV) then Exit;
    @glVertexAttrib4svNV := SDL_GL_GetProcAddress('glVertexAttrib4svNV');
    if not Assigned(glVertexAttrib4svNV) then Exit;
    @glVertexAttrib4fvNV := SDL_GL_GetProcAddress('glVertexAttrib4fvNV');
    if not Assigned(glVertexAttrib4fvNV) then Exit;
    @glVertexAttrib4dvNV := SDL_GL_GetProcAddress('glVertexAttrib4dvNV');
    if not Assigned(glVertexAttrib4dvNV) then Exit;
    @glVertexAttrib4ubvNV := SDL_GL_GetProcAddress('glVertexAttrib4ubvNV');
    if not Assigned(glVertexAttrib4ubvNV) then Exit;
    @glVertexAttribs1svNV := SDL_GL_GetProcAddress('glVertexAttribs1svNV');
    if not Assigned(glVertexAttribs1svNV) then Exit;
    @glVertexAttribs1fvNV := SDL_GL_GetProcAddress('glVertexAttribs1fvNV');
    if not Assigned(glVertexAttribs1fvNV) then Exit;
    @glVertexAttribs1dvNV := SDL_GL_GetProcAddress('glVertexAttribs1dvNV');
    if not Assigned(glVertexAttribs1dvNV) then Exit;
    @glVertexAttribs2svNV := SDL_GL_GetProcAddress('glVertexAttribs2svNV');
    if not Assigned(glVertexAttribs2svNV) then Exit;
    @glVertexAttribs2fvNV := SDL_GL_GetProcAddress('glVertexAttribs2fvNV');
    if not Assigned(glVertexAttribs2fvNV) then Exit;
    @glVertexAttribs2dvNV := SDL_GL_GetProcAddress('glVertexAttribs2dvNV');
    if not Assigned(glVertexAttribs2dvNV) then Exit;
    @glVertexAttribs3svNV := SDL_GL_GetProcAddress('glVertexAttribs3svNV');
    if not Assigned(glVertexAttribs3svNV) then Exit;
    @glVertexAttribs3fvNV := SDL_GL_GetProcAddress('glVertexAttribs3fvNV');
    if not Assigned(glVertexAttribs3fvNV) then Exit;
    @glVertexAttribs3dvNV := SDL_GL_GetProcAddress('glVertexAttribs3dvNV');
    if not Assigned(glVertexAttribs3dvNV) then Exit;
    @glVertexAttribs4svNV := SDL_GL_GetProcAddress('glVertexAttribs4svNV');
    if not Assigned(glVertexAttribs4svNV) then Exit;
    @glVertexAttribs4fvNV := SDL_GL_GetProcAddress('glVertexAttribs4fvNV');
    if not Assigned(glVertexAttribs4fvNV) then Exit;
    @glVertexAttribs4dvNV := SDL_GL_GetProcAddress('glVertexAttribs4dvNV');
    if not Assigned(glVertexAttribs4dvNV) then Exit;
    @glVertexAttribs4ubvNV := SDL_GL_GetProcAddress('glVertexAttribs4ubvNV');
    if not Assigned(glVertexAttribs4ubvNV) then Exit;
    Result := TRUE;
  end;

end;

function Load_GL_NV_vertex_program1_1: Boolean;
var
  extstring : PChar;
begin

  Result := FALSE;
  extstring := glGetString( GL_EXTENSIONS );

  if glext_ExtensionSupported('GL_NV_vertex_program1_1', extstring) then
  begin
    Result := TRUE;
  end;

end;

function Load_GL_ATI_element_array: Boolean;
var
  extstring : PChar;
begin

  Result := FALSE;
  extstring := glGetString( GL_EXTENSIONS );

  if glext_ExtensionSupported('GL_ATI_element_array', extstring) then
  begin
    @glElementPointerATI := SDL_GL_GetProcAddress('glElementPointerATI');
    if not Assigned(glElementPointerATI) then Exit;
    @glDrawElementArrayATI := SDL_GL_GetProcAddress('glDrawElementArrayATI');
    if not Assigned(glDrawElementArrayATI) then Exit;
    @glDrawRangeElementArrayATI := SDL_GL_GetProcAddress('glDrawRangeElementArrayATI');
    if not Assigned(glDrawRangeElementArrayATI) then Exit;
    Result := TRUE;
  end;

end;

function Load_GL_ATI_envmap_bumpmap: Boolean;
var
  extstring : PChar;
begin

  Result := FALSE;
  extstring := glGetString( GL_EXTENSIONS );

  if glext_ExtensionSupported('GL_ATI_envmap_bumpmap', extstring) then
  begin
    @glTexBumpParameterivATI := SDL_GL_GetProcAddress('glTexBumpParameterivATI');
    if not Assigned(glTexBumpParameterivATI) then Exit;
    @glTexBumpParameterfvATI := SDL_GL_GetProcAddress('glTexBumpParameterfvATI');
    if not Assigned(glTexBumpParameterfvATI) then Exit;
    @glGetTexBumpParameterivATI := SDL_GL_GetProcAddress('glGetTexBumpParameterivATI');
    if not Assigned(glGetTexBumpParameterivATI) then Exit;
    @glGetTexBumpParameterfvATI := SDL_GL_GetProcAddress('glGetTexBumpParameterfvATI');
    if not Assigned(glGetTexBumpParameterfvATI) then Exit;
    Result := TRUE;
  end;

end;

function Load_GL_ATI_fragment_shader: Boolean;
var
  extstring : PChar;
begin

  Result := FALSE;
  extstring := glGetString( GL_EXTENSIONS );

  if glext_ExtensionSupported('GL_ATI_fragment_shader', extstring) then
  begin
    @glGenFragmentShadersATI := SDL_GL_GetProcAddress('glGenFragmentShadersATI');
    if not Assigned(glGenFragmentShadersATI) then Exit;
    @glBindFragmentShaderATI := SDL_GL_GetProcAddress('glBindFragmentShaderATI');
    if not Assigned(glBindFragmentShaderATI) then Exit;
    @glDeleteFragmentShaderATI := SDL_GL_GetProcAddress('glDeleteFragmentShaderATI');
    if not Assigned(glDeleteFragmentShaderATI) then Exit;
    @glBeginFragmentShaderATI := SDL_GL_GetProcAddress('glBeginFragmentShaderATI');
    if not Assigned(glBeginFragmentShaderATI) then Exit;
    @glEndFragmentShaderATI := SDL_GL_GetProcAddress('glEndFragmentShaderATI');
    if not Assigned(glEndFragmentShaderATI) then Exit;
    @glPassTexCoordATI := SDL_GL_GetProcAddress('glPassTexCoordATI');
    if not Assigned(glPassTexCoordATI) then Exit;
    @glSampleMapATI := SDL_GL_GetProcAddress('glSampleMapATI');
    if not Assigned(glSampleMapATI) then Exit;
    @glColorFragmentOp1ATI := SDL_GL_GetProcAddress('glColorFragmentOp1ATI');
    if not Assigned(glColorFragmentOp1ATI) then Exit;
    @glColorFragmentOp2ATI := SDL_GL_GetProcAddress('glColorFragmentOp2ATI');
    if not Assigned(glColorFragmentOp2ATI) then Exit;
    @glColorFragmentOp3ATI := SDL_GL_GetProcAddress('glColorFragmentOp3ATI');
    if not Assigned(glColorFragmentOp3ATI) then Exit;
    @glAlphaFragmentOp1ATI := SDL_GL_GetProcAddress('glAlphaFragmentOp1ATI');
    if not Assigned(glAlphaFragmentOp1ATI) then Exit;
    @glAlphaFragmentOp2ATI := SDL_GL_GetProcAddress('glAlphaFragmentOp2ATI');
    if not Assigned(glAlphaFragmentOp2ATI) then Exit;
    @glAlphaFragmentOp3ATI := SDL_GL_GetProcAddress('glAlphaFragmentOp3ATI');
    if not Assigned(glAlphaFragmentOp3ATI) then Exit;
    @glSetFragmentShaderConstantATI := SDL_GL_GetProcAddress('glSetFragmentShaderConstantATI');
    if not Assigned(glSetFragmentShaderConstantATI) then Exit;
    Result := TRUE;
  end;

end;

function Load_GL_ATI_pn_triangles: Boolean;
var
  extstring : PChar;
begin

  Result := FALSE;
  extstring := glGetString( GL_EXTENSIONS );

  if glext_ExtensionSupported('GL_ATI_pn_triangles', extstring) then
  begin
    @glPNTrianglesiATI := SDL_GL_GetProcAddress('glPNTrianglesiATI');
    if not Assigned(glPNTrianglesiATI) then Exit;
    @glPNTrianglesfATI := SDL_GL_GetProcAddress('glPNTrianglesfATI');
    if not Assigned(glPNTrianglesfATI) then Exit;
    Result := TRUE;
  end;

end;

function Load_GL_ATI_texture_mirror_once: Boolean;
var
  extstring : PChar;
begin

  Result := FALSE;
  extstring := glGetString( GL_EXTENSIONS );

  if glext_ExtensionSupported('GL_ATI_texture_mirror_once', extstring) then
  begin
    Result := TRUE;
  end;

end;

function Load_GL_ATI_vertex_array_object: Boolean;
var
  extstring : PChar;
begin

  Result := FALSE;
  extstring := glGetString( GL_EXTENSIONS );

  if glext_ExtensionSupported('GL_ATI_vertex_array_object', extstring) then
  begin
    @glNewObjectBufferATI := SDL_GL_GetProcAddress('glNewObjectBufferATI');
    if not Assigned(glNewObjectBufferATI) then Exit;
    @glIsObjectBufferATI := SDL_GL_GetProcAddress('glIsObjectBufferATI');
    if not Assigned(glIsObjectBufferATI) then Exit;
    @glUpdateObjectBufferATI := SDL_GL_GetProcAddress('glUpdateObjectBufferATI');
    if not Assigned(glUpdateObjectBufferATI) then Exit;
    @glGetObjectBufferfvATI := SDL_GL_GetProcAddress('glGetObjectBufferfvATI');
    if not Assigned(glGetObjectBufferfvATI) then Exit;
    @glGetObjectBufferivATI := SDL_GL_GetProcAddress('glGetObjectBufferivATI');
    if not Assigned(glGetObjectBufferivATI) then Exit;
    @glDeleteObjectBufferATI := SDL_GL_GetProcAddress('glDeleteObjectBufferATI');
    if not Assigned(glDeleteObjectBufferATI) then Exit;
    @glArrayObjectATI := SDL_GL_GetProcAddress('glArrayObjectATI');
    if not Assigned(glArrayObjectATI) then Exit;
    @glGetArrayObjectfvATI := SDL_GL_GetProcAddress('glGetArrayObjectfvATI');
    if not Assigned(glGetArrayObjectfvATI) then Exit;
    @glGetArrayObjectivATI := SDL_GL_GetProcAddress('glGetArrayObjectivATI');
    if not Assigned(glGetArrayObjectivATI) then Exit;
    @glVariantArrayObjectATI := SDL_GL_GetProcAddress('glVariantArrayObjectATI');
    if not Assigned(glVariantArrayObjectATI) then Exit;
    @glGetVariantArrayObjectfvATI := SDL_GL_GetProcAddress('glGetVariantArrayObjectfvATI');
    if not Assigned(glGetVariantArrayObjectfvATI) then Exit;
    @glGetVariantArrayObjectivATI := SDL_GL_GetProcAddress('glGetVariantArrayObjectivATI');
    if not Assigned(glGetVariantArrayObjectivATI) then Exit;
    Result := TRUE;
  end;

end;

function Load_GL_ATI_vertex_streams: Boolean;
var
  extstring : PChar;
begin

  Result := FALSE;
  extstring := glGetString( GL_EXTENSIONS );

  if glext_ExtensionSupported('GL_ATI_vertex_streams', extstring) then
  begin
    @glVertexStream1s := SDL_GL_GetProcAddress('glVertexStream1s');
    if not Assigned(glVertexStream1s) then Exit;
    @glVertexStream1i := SDL_GL_GetProcAddress('glVertexStream1i');
    if not Assigned(glVertexStream1i) then Exit;
    @glVertexStream1f := SDL_GL_GetProcAddress('glVertexStream1f');
    if not Assigned(glVertexStream1f) then Exit;
    @glVertexStream1d := SDL_GL_GetProcAddress('glVertexStream1d');
    if not Assigned(glVertexStream1d) then Exit;
    @glVertexStream1sv := SDL_GL_GetProcAddress('glVertexStream1sv');
    if not Assigned(glVertexStream1sv) then Exit;
    @glVertexStream1iv := SDL_GL_GetProcAddress('glVertexStream1iv');
    if not Assigned(glVertexStream1iv) then Exit;
    @glVertexStream1fv := SDL_GL_GetProcAddress('glVertexStream1fv');
    if not Assigned(glVertexStream1fv) then Exit;
    @glVertexStream1dv := SDL_GL_GetProcAddress('glVertexStream1dv');
    if not Assigned(glVertexStream1dv) then Exit;
    @glVertexStream2s := SDL_GL_GetProcAddress('glVertexStream2s');
    if not Assigned(glVertexStream2s) then Exit;
    @glVertexStream2i := SDL_GL_GetProcAddress('glVertexStream2i');
    if not Assigned(glVertexStream2i) then Exit;
    @glVertexStream2f := SDL_GL_GetProcAddress('glVertexStream2f');
    if not Assigned(glVertexStream2f) then Exit;
    @glVertexStream2d := SDL_GL_GetProcAddress('glVertexStream2d');
    if not Assigned(glVertexStream2d) then Exit;
    @glVertexStream2sv := SDL_GL_GetProcAddress('glVertexStream2sv');
    if not Assigned(glVertexStream2sv) then Exit;
    @glVertexStream2iv := SDL_GL_GetProcAddress('glVertexStream2iv');
    if not Assigned(glVertexStream2iv) then Exit;
    @glVertexStream2fv := SDL_GL_GetProcAddress('glVertexStream2fv');
    if not Assigned(glVertexStream2fv) then Exit;
    @glVertexStream2dv := SDL_GL_GetProcAddress('glVertexStream2dv');
    if not Assigned(glVertexStream2dv) then Exit;
    @glVertexStream3s := SDL_GL_GetProcAddress('glVertexStream3s');
    if not Assigned(glVertexStream3s) then Exit;
    @glVertexStream3i := SDL_GL_GetProcAddress('glVertexStream3i');
    if not Assigned(glVertexStream3i) then Exit;
    @glVertexStream3f := SDL_GL_GetProcAddress('glVertexStream3f');
    if not Assigned(glVertexStream3f) then Exit;
    @glVertexStream3d := SDL_GL_GetProcAddress('glVertexStream3d');
    if not Assigned(glVertexStream3d) then Exit;
    @glVertexStream3sv := SDL_GL_GetProcAddress('glVertexStream3sv');
    if not Assigned(glVertexStream3sv) then Exit;
    @glVertexStream3iv := SDL_GL_GetProcAddress('glVertexStream3iv');
    if not Assigned(glVertexStream3iv) then Exit;
    @glVertexStream3fv := SDL_GL_GetProcAddress('glVertexStream3fv');
    if not Assigned(glVertexStream3fv) then Exit;
    @glVertexStream3dv := SDL_GL_GetProcAddress('glVertexStream3dv');
    if not Assigned(glVertexStream3dv) then Exit;
    @glVertexStream4s := SDL_GL_GetProcAddress('glVertexStream4s');
    if not Assigned(glVertexStream4s) then Exit;
    @glVertexStream4i := SDL_GL_GetProcAddress('glVertexStream4i');
    if not Assigned(glVertexStream4i) then Exit;
    @glVertexStream4f := SDL_GL_GetProcAddress('glVertexStream4f');
    if not Assigned(glVertexStream4f) then Exit;
    @glVertexStream4d := SDL_GL_GetProcAddress('glVertexStream4d');
    if not Assigned(glVertexStream4d) then Exit;
    @glVertexStream4sv := SDL_GL_GetProcAddress('glVertexStream4sv');
    if not Assigned(glVertexStream4sv) then Exit;
    @glVertexStream4iv := SDL_GL_GetProcAddress('glVertexStream4iv');
    if not Assigned(glVertexStream4iv) then Exit;
    @glVertexStream4fv := SDL_GL_GetProcAddress('glVertexStream4fv');
    if not Assigned(glVertexStream4fv) then Exit;
    @glVertexStream4dv := SDL_GL_GetProcAddress('glVertexStream4dv');
    if not Assigned(glVertexStream4dv) then Exit;
    @glNormalStream3b := SDL_GL_GetProcAddress('glNormalStream3b');
    if not Assigned(glNormalStream3b) then Exit;
    @glNormalStream3s := SDL_GL_GetProcAddress('glNormalStream3s');
    if not Assigned(glNormalStream3s) then Exit;
    @glNormalStream3i := SDL_GL_GetProcAddress('glNormalStream3i');
    if not Assigned(glNormalStream3i) then Exit;
    @glNormalStream3f := SDL_GL_GetProcAddress('glNormalStream3f');
    if not Assigned(glNormalStream3f) then Exit;
    @glNormalStream3d := SDL_GL_GetProcAddress('glNormalStream3d');
    if not Assigned(glNormalStream3d) then Exit;
    @glNormalStream3bv := SDL_GL_GetProcAddress('glNormalStream3bv');
    if not Assigned(glNormalStream3bv) then Exit;
    @glNormalStream3sv := SDL_GL_GetProcAddress('glNormalStream3sv');
    if not Assigned(glNormalStream3sv) then Exit;
    @glNormalStream3iv := SDL_GL_GetProcAddress('glNormalStream3iv');
    if not Assigned(glNormalStream3iv) then Exit;
    @glNormalStream3fv := SDL_GL_GetProcAddress('glNormalStream3fv');
    if not Assigned(glNormalStream3fv) then Exit;
    @glNormalStream3dv := SDL_GL_GetProcAddress('glNormalStream3dv');
    if not Assigned(glNormalStream3dv) then Exit;
    @glClientActiveVertexStream := SDL_GL_GetProcAddress('glClientActiveVertexStream');
    if not Assigned(glClientActiveVertexStream) then Exit;
    @glVertexBlendEnvi := SDL_GL_GetProcAddress('glVertexBlendEnvi');
    if not Assigned(glVertexBlendEnvi) then Exit;
    @glVertexBlendEnvf := SDL_GL_GetProcAddress('glVertexBlendEnvf');
    if not Assigned(glVertexBlendEnvf) then Exit;
    Result := TRUE;
  end;

end;

{$IFDEF WINDOWS}
function Load_WGL_I3D_image_buffer: Boolean;
var
  extstring : PChar;
begin

  Result := FALSE;
  @wglGetExtensionsStringARB := SDL_GL_GetProcAddress('wglGetExtensionsStringARB');
  if not Assigned(wglGetExtensionsStringARB) then Exit;
  extstring := wglGetExtensionsStringARB(wglGetCurrentDC);

  if glext_ExtensionSupported('WGL_I3D_image_buffer', extstring) then
  begin
    @wglCreateImageBufferI3D := SDL_GL_GetProcAddress('wglCreateImageBufferI3D');
    if not Assigned(wglCreateImageBufferI3D) then Exit;
    @wglDestroyImageBufferI3D := SDL_GL_GetProcAddress('wglDestroyImageBufferI3D');
    if not Assigned(wglDestroyImageBufferI3D) then Exit;
    @wglAssociateImageBufferEventsI3D := SDL_GL_GetProcAddress('wglAssociateImageBufferEventsI3D');
    if not Assigned(wglAssociateImageBufferEventsI3D) then Exit;
    @wglReleaseImageBufferEventsI3D := SDL_GL_GetProcAddress('wglReleaseImageBufferEventsI3D');
    if not Assigned(wglReleaseImageBufferEventsI3D) then Exit;
    Result := TRUE;
  end;

end;

function Load_WGL_I3D_swap_frame_lock: Boolean;
var
  extstring : PChar;
begin

  Result := FALSE;
  @wglGetExtensionsStringARB := SDL_GL_GetProcAddress('wglGetExtensionsStringARB');
  if not Assigned(wglGetExtensionsStringARB) then Exit;
  extstring := wglGetExtensionsStringARB(wglGetCurrentDC);

  if glext_ExtensionSupported('WGL_I3D_swap_frame_lock', extstring) then
  begin
    @wglEnableFrameLockI3D := SDL_GL_GetProcAddress('wglEnableFrameLockI3D');
    if not Assigned(wglEnableFrameLockI3D) then Exit;
    @wglDisableFrameLockI3D := SDL_GL_GetProcAddress('wglDisableFrameLockI3D');
    if not Assigned(wglDisableFrameLockI3D) then Exit;
    @wglIsEnabledFrameLockI3D := SDL_GL_GetProcAddress('wglIsEnabledFrameLockI3D');
    if not Assigned(wglIsEnabledFrameLockI3D) then Exit;
    @wglQueryFrameLockMasterI3D := SDL_GL_GetProcAddress('wglQueryFrameLockMasterI3D');
    if not Assigned(wglQueryFrameLockMasterI3D) then Exit;
    Result := TRUE;
  end;

end;

function Load_WGL_I3D_swap_frame_usage: Boolean;
var
  extstring : PChar;
begin

  Result := FALSE;
  @wglGetExtensionsStringARB := SDL_GL_GetProcAddress('wglGetExtensionsStringARB');
  if not Assigned(wglGetExtensionsStringARB) then Exit;
  extstring := wglGetExtensionsStringARB(wglGetCurrentDC);

  if glext_ExtensionSupported('WGL_I3D_swap_frame_usage', extstring) then
  begin
    @wglGetFrameUsageI3D := SDL_GL_GetProcAddress('wglGetFrameUsageI3D');
    if not Assigned(wglGetFrameUsageI3D) then Exit;
    @wglBeginFrameTrackingI3D := SDL_GL_GetProcAddress('wglBeginFrameTrackingI3D');
    if not Assigned(wglBeginFrameTrackingI3D) then Exit;
    @wglEndFrameTrackingI3D := SDL_GL_GetProcAddress('wglEndFrameTrackingI3D');
    if not Assigned(wglEndFrameTrackingI3D) then Exit;
    @wglQueryFrameTrackingI3D := SDL_GL_GetProcAddress('wglQueryFrameTrackingI3D');
    if not Assigned(wglQueryFrameTrackingI3D) then Exit;
    Result := TRUE;
  end;

end;
{$ENDIF}

function Load_GL_3DFX_texture_compression_FXT1: Boolean;
var
  extstring : PChar;
begin

  Result := FALSE;
  extstring := glGetString( GL_EXTENSIONS );

  if glext_ExtensionSupported('GL_3DFX_texture_compression_FXT1', extstring) then
  begin
    Result := TRUE;
  end;

end;

function Load_GL_IBM_cull_vertex: Boolean;
var
  extstring : PChar;
begin

  Result := FALSE;
  extstring := glGetString( GL_EXTENSIONS );

  if glext_ExtensionSupported('GL_IBM_cull_vertex', extstring) then
  begin
    Result := TRUE;
  end;

end;

function Load_GL_IBM_multimode_draw_arrays: Boolean;
var
  extstring : PChar;
begin

  Result := FALSE;
  extstring := glGetString( GL_EXTENSIONS );

  if glext_ExtensionSupported('GL_IBM_multimode_draw_arrays', extstring) then
  begin
    @glMultiModeDrawArraysIBM := SDL_GL_GetProcAddress('glMultiModeDrawArraysIBM');
    if not Assigned(glMultiModeDrawArraysIBM) then Exit;
    @glMultiModeDrawElementsIBM := SDL_GL_GetProcAddress('glMultiModeDrawElementsIBM');
    if not Assigned(glMultiModeDrawElementsIBM) then Exit;
    Result := TRUE;
  end;

end;

function Load_GL_IBM_raster_pos_clip: Boolean;
var
  extstring : PChar;
begin

  Result := FALSE;
  extstring := glGetString( GL_EXTENSIONS );

  if glext_ExtensionSupported('GL_IBM_raster_pos_clip', extstring) then
  begin
    Result := TRUE;
  end;

end;

function Load_GL_IBM_texture_mirrored_repeat: Boolean;
var
  extstring : PChar;
begin

  Result := FALSE;
  extstring := glGetString( GL_EXTENSIONS );

  if glext_ExtensionSupported('GL_IBM_texture_mirrored_repeat', extstring) then
  begin
    Result := TRUE;
  end;

end;

function Load_GL_IBM_vertex_array_lists: Boolean;
var
  extstring : PChar;
begin

  Result := FALSE;
  extstring := glGetString( GL_EXTENSIONS );

  if glext_ExtensionSupported('GL_IBM_vertex_array_lists', extstring) then
  begin
    @glColorPointerListIBM := SDL_GL_GetProcAddress('glColorPointerListIBM');
    if not Assigned(glColorPointerListIBM) then Exit;
    @glSecondaryColorPointerListIBM := SDL_GL_GetProcAddress('glSecondaryColorPointerListIBM');
    if not Assigned(glSecondaryColorPointerListIBM) then Exit;
    @glEdgeFlagPointerListIBM := SDL_GL_GetProcAddress('glEdgeFlagPointerListIBM');
    if not Assigned(glEdgeFlagPointerListIBM) then Exit;
    @glFogCoordPointerListIBM := SDL_GL_GetProcAddress('glFogCoordPointerListIBM');
    if not Assigned(glFogCoordPointerListIBM) then Exit;
    @glNormalPointerListIBM := SDL_GL_GetProcAddress('glNormalPointerListIBM');
    if not Assigned(glNormalPointerListIBM) then Exit;
    @glTexCoordPointerListIBM := SDL_GL_GetProcAddress('glTexCoordPointerListIBM');
    if not Assigned(glTexCoordPointerListIBM) then Exit;
    @glVertexPointerListIBM := SDL_GL_GetProcAddress('glVertexPointerListIBM');
    if not Assigned(glVertexPointerListIBM) then Exit;
    Result := TRUE;
  end;

end;

function Load_GL_MESA_resize_buffers: Boolean;
var
  extstring : PChar;
begin

  Result := FALSE;
  extstring := glGetString( GL_EXTENSIONS );

  if glext_ExtensionSupported('GL_MESA_resize_buffers', extstring) then
  begin
    @glResizeBuffersMESA := SDL_GL_GetProcAddress('glResizeBuffersMESA');
    if not Assigned(glResizeBuffersMESA) then Exit;
    Result := TRUE;
  end;

end;

function Load_GL_MESA_window_pos: Boolean;
var
  extstring : PChar;
begin

  Result := FALSE;
  extstring := glGetString( GL_EXTENSIONS );

  if glext_ExtensionSupported('GL_MESA_window_pos', extstring) then
  begin
    @glWindowPos2dMESA := SDL_GL_GetProcAddress('glWindowPos2dMESA');
    if not Assigned(glWindowPos2dMESA) then Exit;
    @glWindowPos2fMESA := SDL_GL_GetProcAddress('glWindowPos2fMESA');
    if not Assigned(glWindowPos2fMESA) then Exit;
    @glWindowPos2iMESA := SDL_GL_GetProcAddress('glWindowPos2iMESA');
    if not Assigned(glWindowPos2iMESA) then Exit;
    @glWindowPos2sMESA := SDL_GL_GetProcAddress('glWindowPos2sMESA');
    if not Assigned(glWindowPos2sMESA) then Exit;
    @glWindowPos2ivMESA := SDL_GL_GetProcAddress('glWindowPos2ivMESA');
    if not Assigned(glWindowPos2ivMESA) then Exit;
    @glWindowPos2svMESA := SDL_GL_GetProcAddress('glWindowPos2svMESA');
    if not Assigned(glWindowPos2svMESA) then Exit;
    @glWindowPos2fvMESA := SDL_GL_GetProcAddress('glWindowPos2fvMESA');
    if not Assigned(glWindowPos2fvMESA) then Exit;
    @glWindowPos2dvMESA := SDL_GL_GetProcAddress('glWindowPos2dvMESA');
    if not Assigned(glWindowPos2dvMESA) then Exit;
    @glWindowPos3iMESA := SDL_GL_GetProcAddress('glWindowPos3iMESA');
    if not Assigned(glWindowPos3iMESA) then Exit;
    @glWindowPos3sMESA := SDL_GL_GetProcAddress('glWindowPos3sMESA');
    if not Assigned(glWindowPos3sMESA) then Exit;
    @glWindowPos3fMESA := SDL_GL_GetProcAddress('glWindowPos3fMESA');
    if not Assigned(glWindowPos3fMESA) then Exit;
    @glWindowPos3dMESA := SDL_GL_GetProcAddress('glWindowPos3dMESA');
    if not Assigned(glWindowPos3dMESA) then Exit;
    @glWindowPos3ivMESA := SDL_GL_GetProcAddress('glWindowPos3ivMESA');
    if not Assigned(glWindowPos3ivMESA) then Exit;
    @glWindowPos3svMESA := SDL_GL_GetProcAddress('glWindowPos3svMESA');
    if not Assigned(glWindowPos3svMESA) then Exit;
    @glWindowPos3fvMESA := SDL_GL_GetProcAddress('glWindowPos3fvMESA');
    if not Assigned(glWindowPos3fvMESA) then Exit;
    @glWindowPos3dvMESA := SDL_GL_GetProcAddress('glWindowPos3dvMESA');
    if not Assigned(glWindowPos3dvMESA) then Exit;
    @glWindowPos4iMESA := SDL_GL_GetProcAddress('glWindowPos4iMESA');
    if not Assigned(glWindowPos4iMESA) then Exit;
    @glWindowPos4sMESA := SDL_GL_GetProcAddress('glWindowPos4sMESA');
    if not Assigned(glWindowPos4sMESA) then Exit;
    @glWindowPos4fMESA := SDL_GL_GetProcAddress('glWindowPos4fMESA');
    if not Assigned(glWindowPos4fMESA) then Exit;
    @glWindowPos4dMESA := SDL_GL_GetProcAddress('glWindowPos4dMESA');
    if not Assigned(glWindowPos4dMESA) then Exit;
    @glWindowPos4ivMESA := SDL_GL_GetProcAddress('glWindowPos4ivMESA');
    if not Assigned(glWindowPos4ivMESA) then Exit;
    @glWindowPos4svMESA := SDL_GL_GetProcAddress('glWindowPos4svMESA');
    if not Assigned(glWindowPos4svMESA) then Exit;
    @glWindowPos4fvMESA := SDL_GL_GetProcAddress('glWindowPos4fvMESA');
    if not Assigned(glWindowPos4fvMESA) then Exit;
    @glWindowPos4dvMESA := SDL_GL_GetProcAddress('glWindowPos4dvMESA');
    if not Assigned(glWindowPos4dvMESA) then Exit;
    Result := TRUE;
  end;

end;

function Load_GL_OML_interlace: Boolean;
var
  extstring : PChar;
begin

  Result := FALSE;
  extstring := glGetString( GL_EXTENSIONS );

  if glext_ExtensionSupported('GL_OML_interlace', extstring) then
  begin
    Result := TRUE;
  end;

end;

function Load_GL_OML_resample: Boolean;
var
  extstring : PChar;
begin

  Result := FALSE;
  extstring := glGetString( GL_EXTENSIONS );

  if glext_ExtensionSupported('GL_OML_resample', extstring) then
  begin
    Result := TRUE;
  end;

end;

function Load_GL_OML_subsample: Boolean;
var
  extstring : PChar;
begin

  Result := FALSE;
  extstring := glGetString( GL_EXTENSIONS );

  if glext_ExtensionSupported('GL_OML_subsample', extstring) then
  begin
    Result := TRUE;
  end;

end;

function Load_GL_SGIS_generate_mipmap: Boolean;
var
  extstring : PChar;
begin

  Result := FALSE;
  extstring := glGetString( GL_EXTENSIONS );

  if glext_ExtensionSupported('GL_SGIS_generate_mipmap', extstring) then
  begin
    Result := TRUE;
  end;

end;

function Load_GL_SGIS_multisample: Boolean;
var
  extstring : PChar;
begin

  Result := FALSE;
  extstring := glGetString( GL_EXTENSIONS );

  if glext_ExtensionSupported('GL_SGIS_multisample', extstring) then
  begin
    @glSampleMaskSGIS := SDL_GL_GetProcAddress('glSampleMaskSGIS');
    if not Assigned(glSampleMaskSGIS) then Exit;
    @glSamplePatternSGIS := SDL_GL_GetProcAddress('glSamplePatternSGIS');
    if not Assigned(glSamplePatternSGIS) then Exit;
    Result := TRUE;
  end;

end;

function Load_GL_SGIS_pixel_texture: Boolean;
var
  extstring : PChar;
begin

  Result := FALSE;
  extstring := glGetString( GL_EXTENSIONS );

  if glext_ExtensionSupported('GL_SGIS_pixel_texture', extstring) then
  begin
    @glPixelTexGenParameteriSGIS := SDL_GL_GetProcAddress('glPixelTexGenParameteriSGIS');
    if not Assigned(glPixelTexGenParameteriSGIS) then Exit;
    @glPixelTexGenParameterfSGIS := SDL_GL_GetProcAddress('glPixelTexGenParameterfSGIS');
    if not Assigned(glPixelTexGenParameterfSGIS) then Exit;
    @glGetPixelTexGenParameterivSGIS := SDL_GL_GetProcAddress('glGetPixelTexGenParameterivSGIS');
    if not Assigned(glGetPixelTexGenParameterivSGIS) then Exit;
    @glGetPixelTexGenParameterfvSGIS := SDL_GL_GetProcAddress('glGetPixelTexGenParameterfvSGIS');
    if not Assigned(glGetPixelTexGenParameterfvSGIS) then Exit;
    Result := TRUE;
  end;

end;

function Load_GL_SGIS_texture_border_clamp: Boolean;
var
  extstring : PChar;
begin

  Result := FALSE;
  extstring := glGetString( GL_EXTENSIONS );

  if glext_ExtensionSupported('GL_SGIS_texture_border_clamp', extstring) then
  begin
    Result := TRUE;
  end;

end;

function Load_GL_SGIS_texture_color_mask: Boolean;
var
  extstring : PChar;
begin

  Result := FALSE;
  extstring := glGetString( GL_EXTENSIONS );

  if glext_ExtensionSupported('GL_SGIS_texture_color_mask', extstring) then
  begin
    @glTextureColorMaskSGIS := SDL_GL_GetProcAddress('glTextureColorMaskSGIS');
    if not Assigned(glTextureColorMaskSGIS) then Exit;
    Result := TRUE;
  end;

end;

function Load_GL_SGIS_texture_edge_clamp: Boolean;
var
  extstring : PChar;
begin

  Result := FALSE;
  extstring := glGetString( GL_EXTENSIONS );

  if glext_ExtensionSupported('GL_SGIS_texture_edge_clamp', extstring) then
  begin
    Result := TRUE;
  end;

end;

function Load_GL_SGIS_texture_lod: Boolean;
var
  extstring : PChar;
begin

  Result := FALSE;
  extstring := glGetString( GL_EXTENSIONS );

  if glext_ExtensionSupported('GL_SGIS_texture_lod', extstring) then
  begin
    Result := TRUE;
  end;

end;

function Load_GL_SGIS_depth_texture: Boolean;
var
  extstring : PChar;
begin

  Result := FALSE;
  extstring := glGetString( GL_EXTENSIONS );

  if glext_ExtensionSupported('GL_SGIS_depth_texture', extstring) then
  begin
    Result := TRUE;
  end;

end;

function Load_GL_SGIX_fog_offset: Boolean;
var
  extstring : PChar;
begin

  Result := FALSE;
  extstring := glGetString( GL_EXTENSIONS );

  if glext_ExtensionSupported('GL_SGIX_fog_offset', extstring) then
  begin
    Result := TRUE;
  end;

end;

function Load_GL_SGIX_interlace: Boolean;
var
  extstring : PChar;
begin

  Result := FALSE;
  extstring := glGetString( GL_EXTENSIONS );

  if glext_ExtensionSupported('GL_SGIX_interlace', extstring) then
  begin
    Result := TRUE;
  end;

end;

function Load_GL_SGIX_shadow_ambient: Boolean;
var
  extstring : PChar;
begin

  Result := FALSE;
  extstring := glGetString( GL_EXTENSIONS );

  if glext_ExtensionSupported('GL_SGIX_shadow_ambient', extstring) then
  begin
    Result := TRUE;
  end;

end;

function Load_GL_SGI_color_matrix: Boolean;
var
  extstring : PChar;
begin

  Result := FALSE;
  extstring := glGetString( GL_EXTENSIONS );

  if glext_ExtensionSupported('GL_SGI_color_matrix', extstring) then
  begin
    Result := TRUE;
  end;

end;

function Load_GL_SGI_color_table: Boolean;
var
  extstring : PChar;
begin

  Result := FALSE;
  extstring := glGetString( GL_EXTENSIONS );

  if glext_ExtensionSupported('GL_SGI_color_table', extstring) then
  begin
    @glColorTableSGI := SDL_GL_GetProcAddress('glColorTableSGI');
    if not Assigned(glColorTableSGI) then Exit;
    @glCopyColorTableSGI := SDL_GL_GetProcAddress('glCopyColorTableSGI');
    if not Assigned(glCopyColorTableSGI) then Exit;
    @glColorTableParameterivSGI := SDL_GL_GetProcAddress('glColorTableParameterivSGI');
    if not Assigned(glColorTableParameterivSGI) then Exit;
    @glColorTableParameterfvSGI := SDL_GL_GetProcAddress('glColorTableParameterfvSGI');
    if not Assigned(glColorTableParameterfvSGI) then Exit;
    @glGetColorTableSGI := SDL_GL_GetProcAddress('glGetColorTableSGI');
    if not Assigned(glGetColorTableSGI) then Exit;
    @glGetColorTableParameterivSGI := SDL_GL_GetProcAddress('glGetColorTableParameterivSGI');
    if not Assigned(glGetColorTableParameterivSGI) then Exit;
    @glGetColorTableParameterfvSGI := SDL_GL_GetProcAddress('glGetColorTableParameterfvSGI');
    if not Assigned(glGetColorTableParameterfvSGI) then Exit;
    Result := TRUE;
  end;

end;

function Load_GL_SGI_texture_color_table: Boolean;
var
  extstring : PChar;
begin

  Result := FALSE;
  extstring := glGetString( GL_EXTENSIONS );

  if glext_ExtensionSupported('GL_SGI_texture_color_table', extstring) then
  begin
    Result := TRUE;
  end;

end;

function Load_GL_SUN_vertex: Boolean;
var
  extstring : PChar;
begin

  Result := FALSE;
  extstring := glGetString( GL_EXTENSIONS );

  if glext_ExtensionSupported('GL_SUN_vertex', extstring) then
  begin
    @glColor4ubVertex2fSUN := SDL_GL_GetProcAddress('glColor4ubVertex2fSUN');
    if not Assigned(glColor4ubVertex2fSUN) then Exit;
    @glColor4ubVertex2fvSUN := SDL_GL_GetProcAddress('glColor4ubVertex2fvSUN');
    if not Assigned(glColor4ubVertex2fvSUN) then Exit;
    @glColor4ubVertex3fSUN := SDL_GL_GetProcAddress('glColor4ubVertex3fSUN');
    if not Assigned(glColor4ubVertex3fSUN) then Exit;
    @glColor4ubVertex3fvSUN := SDL_GL_GetProcAddress('glColor4ubVertex3fvSUN');
    if not Assigned(glColor4ubVertex3fvSUN) then Exit;
    @glColor3fVertex3fSUN := SDL_GL_GetProcAddress('glColor3fVertex3fSUN');
    if not Assigned(glColor3fVertex3fSUN) then Exit;
    @glColor3fVertex3fvSUN := SDL_GL_GetProcAddress('glColor3fVertex3fvSUN');
    if not Assigned(glColor3fVertex3fvSUN) then Exit;
    @glNormal3fVertex3fSUN := SDL_GL_GetProcAddress('glNormal3fVertex3fSUN');
    if not Assigned(glNormal3fVertex3fSUN) then Exit;
    @glNormal3fVertex3fvSUN := SDL_GL_GetProcAddress('glNormal3fVertex3fvSUN');
    if not Assigned(glNormal3fVertex3fvSUN) then Exit;
    @glColor4fNormal3fVertex3fSUN := SDL_GL_GetProcAddress('glColor4fNormal3fVertex3fSUN');
    if not Assigned(glColor4fNormal3fVertex3fSUN) then Exit;
    @glColor4fNormal3fVertex3fvSUN := SDL_GL_GetProcAddress('glColor4fNormal3fVertex3fvSUN');
    if not Assigned(glColor4fNormal3fVertex3fvSUN) then Exit;
    @glTexCoord2fVertex3fSUN := SDL_GL_GetProcAddress('glTexCoord2fVertex3fSUN');
    if not Assigned(glTexCoord2fVertex3fSUN) then Exit;
    @glTexCoord2fVertex3fvSUN := SDL_GL_GetProcAddress('glTexCoord2fVertex3fvSUN');
    if not Assigned(glTexCoord2fVertex3fvSUN) then Exit;
    @glTexCoord4fVertex4fSUN := SDL_GL_GetProcAddress('glTexCoord4fVertex4fSUN');
    if not Assigned(glTexCoord4fVertex4fSUN) then Exit;
    @glTexCoord4fVertex4fvSUN := SDL_GL_GetProcAddress('glTexCoord4fVertex4fvSUN');
    if not Assigned(glTexCoord4fVertex4fvSUN) then Exit;
    @glTexCoord2fColor4ubVertex3fSUN := SDL_GL_GetProcAddress('glTexCoord2fColor4ubVertex3fSUN');
    if not Assigned(glTexCoord2fColor4ubVertex3fSUN) then Exit;
    @glTexCoord2fColor4ubVertex3fvSUN := SDL_GL_GetProcAddress('glTexCoord2fColor4ubVertex3fvSUN');
    if not Assigned(glTexCoord2fColor4ubVertex3fvSUN) then Exit;
    @glTexCoord2fColor3fVertex3fSUN := SDL_GL_GetProcAddress('glTexCoord2fColor3fVertex3fSUN');
    if not Assigned(glTexCoord2fColor3fVertex3fSUN) then Exit;
    @glTexCoord2fColor3fVertex3fvSUN := SDL_GL_GetProcAddress('glTexCoord2fColor3fVertex3fvSUN');
    if not Assigned(glTexCoord2fColor3fVertex3fvSUN) then Exit;
    @glTexCoord2fNormal3fVertex3fSUN := SDL_GL_GetProcAddress('glTexCoord2fNormal3fVertex3fSUN');
    if not Assigned(glTexCoord2fNormal3fVertex3fSUN) then Exit;
    @glTexCoord2fNormal3fVertex3fvSUN := SDL_GL_GetProcAddress('glTexCoord2fNormal3fVertex3fvSUN');
    if not Assigned(glTexCoord2fNormal3fVertex3fvSUN) then Exit;
    @glTexCoord2fColor4fNormal3fVertex3fSUN := SDL_GL_GetProcAddress('glTexCoord2fColor4fNormal3fVertex3fSUN');
    if not Assigned(glTexCoord2fColor4fNormal3fVertex3fSUN) then Exit;
    @glTexCoord2fColor4fNormal3fVertex3fvSUN := SDL_GL_GetProcAddress('glTexCoord2fColor4fNormal3fVertex3fvSUN');
    if not Assigned(glTexCoord2fColor4fNormal3fVertex3fvSUN) then Exit;
    @glTexCoord4fColor4fNormal3fVertex4fSUN := SDL_GL_GetProcAddress('glTexCoord4fColor4fNormal3fVertex4fSUN');
    if not Assigned(glTexCoord4fColor4fNormal3fVertex4fSUN) then Exit;
    @glTexCoord4fColor4fNormal3fVertex4fvSUN := SDL_GL_GetProcAddress('glTexCoord4fColor4fNormal3fVertex4fvSUN');
    if not Assigned(glTexCoord4fColor4fNormal3fVertex4fvSUN) then Exit;
    @glReplacementCodeuiVertex3fSUN := SDL_GL_GetProcAddress('glReplacementCodeuiVertex3fSUN');
    if not Assigned(glReplacementCodeuiVertex3fSUN) then Exit;
    @glReplacementCodeuiVertex3fvSUN := SDL_GL_GetProcAddress('glReplacementCodeuiVertex3fvSUN');
    if not Assigned(glReplacementCodeuiVertex3fvSUN) then Exit;
    @glReplacementCodeuiColor4ubVertex3fSUN := SDL_GL_GetProcAddress('glReplacementCodeuiColor4ubVertex3fSUN');
    if not Assigned(glReplacementCodeuiColor4ubVertex3fSUN) then Exit;
    @glReplacementCodeuiColor4ubVertex3fvSUN := SDL_GL_GetProcAddress('glReplacementCodeuiColor4ubVertex3fvSUN');
    if not Assigned(glReplacementCodeuiColor4ubVertex3fvSUN) then Exit;
    @glReplacementCodeuiColor3fVertex3fSUN := SDL_GL_GetProcAddress('glReplacementCodeuiColor3fVertex3fSUN');
    if not Assigned(glReplacementCodeuiColor3fVertex3fSUN) then Exit;
    @glReplacementCodeuiColor3fVertex3fvSUN := SDL_GL_GetProcAddress('glReplacementCodeuiColor3fVertex3fvSUN');
    if not Assigned(glReplacementCodeuiColor3fVertex3fvSUN) then Exit;
    @glReplacementCodeuiNormal3fVertex3fSUN := SDL_GL_GetProcAddress('glReplacementCodeuiNormal3fVertex3fSUN');
    if not Assigned(glReplacementCodeuiNormal3fVertex3fSUN) then Exit;
    @glReplacementCodeuiNormal3fVertex3fvSUN := SDL_GL_GetProcAddress('glReplacementCodeuiNormal3fVertex3fvSUN');
    if not Assigned(glReplacementCodeuiNormal3fVertex3fvSUN) then Exit;
    @glReplacementCodeuiColor4fNormal3fVertex3fSUN := SDL_GL_GetProcAddress('glReplacementCodeuiColor4fNormal3fVertex3fSUN');
    if not Assigned(glReplacementCodeuiColor4fNormal3fVertex3fSUN) then Exit;
    @glReplacementCodeuiColor4fNormal3fVertex3fvSUN := SDL_GL_GetProcAddress('glReplacementCodeuiColor4fNormal3fVertex3fvSUN');
    if not Assigned(glReplacementCodeuiColor4fNormal3fVertex3fvSUN) then Exit;
    @glReplacementCodeuiTexCoord2fVertex3fSUN := SDL_GL_GetProcAddress('glReplacementCodeuiTexCoord2fVertex3fSUN');
    if not Assigned(glReplacementCodeuiTexCoord2fVertex3fSUN) then Exit;
    @glReplacementCodeuiTexCoord2fVertex3fvSUN := SDL_GL_GetProcAddress('glReplacementCodeuiTexCoord2fVertex3fvSUN');
    if not Assigned(glReplacementCodeuiTexCoord2fVertex3fvSUN) then Exit;
    @glReplacementCodeuiTexCoord2fNormal3fVertex3fSUN := SDL_GL_GetProcAddress('glReplacementCodeuiTexCoord2fNormal3fVertex3fSUN');
    if not Assigned(glReplacementCodeuiTexCoord2fNormal3fVertex3fSUN) then Exit;
    @glReplacementCodeuiTexCoord2fNormal3fVertex3fvSUN := SDL_GL_GetProcAddress('glReplacementCodeuiTexCoord2fNormal3fVertex3fvSUN');
    if not Assigned(glReplacementCodeuiTexCoord2fNormal3fVertex3fvSUN) then Exit;
    @glReplacementCodeuiTexCoord2fColor4fNormal3fVertex3fSUN := SDL_GL_GetProcAddress('glReplacementCodeuiTexCoord2fColor4fNormal3fVertex3fSUN');
    if not Assigned(glReplacementCodeuiTexCoord2fColor4fNormal3fVertex3fSUN) then Exit;
    @glReplacementCodeuiTexCoord2fColor4fNormal3fVertex3fvSUN := SDL_GL_GetProcAddress('glReplacementCodeuiTexCoord2fColor4fNormal3fVertex3fvSUN');
    if not Assigned(glReplacementCodeuiTexCoord2fColor4fNormal3fVertex3fvSUN) then Exit;
    Result := TRUE;
  end;

end;

function Load_GL_ARB_fragment_program: Boolean;
var
  extstring : PChar;
begin

  Result := FALSE;
  extstring := glGetString( GL_EXTENSIONS );

  if glext_ExtensionSupported('GL_ARB_fragment_program', extstring) then
  begin
    @glProgramStringARB := SDL_GL_GetProcAddress('glProgramStringARB');
    if not Assigned(glProgramStringARB) then Exit;
    @glBindProgramARB := SDL_GL_GetProcAddress('glBindProgramARB');
    if not Assigned(glBindProgramARB) then Exit;
    @glDeleteProgramsARB := SDL_GL_GetProcAddress('glDeleteProgramsARB');
    if not Assigned(glDeleteProgramsARB) then Exit;
    @glGenProgramsARB := SDL_GL_GetProcAddress('glGenProgramsARB');
    if not Assigned(glGenProgramsARB) then Exit;
    @glProgramEnvParameter4dARB := SDL_GL_GetProcAddress('glProgramEnvParameter4dARB');
    if not Assigned(glProgramEnvParameter4dARB) then Exit;
    @glProgramEnvParameter4dvARB := SDL_GL_GetProcAddress('glProgramEnvParameter4dvARB');
    if not Assigned(glProgramEnvParameter4dvARB) then Exit;
    @glProgramEnvParameter4fARB := SDL_GL_GetProcAddress('glProgramEnvParameter4fARB');
    if not Assigned(glProgramEnvParameter4fARB) then Exit;
    @glProgramEnvParameter4fvARB := SDL_GL_GetProcAddress('glProgramEnvParameter4fvARB');
    if not Assigned(glProgramEnvParameter4fvARB) then Exit;
    @glProgramLocalParameter4dARB := SDL_GL_GetProcAddress('glProgramLocalParameter4dARB');
    if not Assigned(glProgramLocalParameter4dARB) then Exit;
    @glProgramLocalParameter4dvARB := SDL_GL_GetProcAddress('glProgramLocalParameter4dvARB');
    if not Assigned(glProgramLocalParameter4dvARB) then Exit;
    @glProgramLocalParameter4fARB := SDL_GL_GetProcAddress('glProgramLocalParameter4fARB');
    if not Assigned(glProgramLocalParameter4fARB) then Exit;
    @glProgramLocalParameter4fvARB := SDL_GL_GetProcAddress('glProgramLocalParameter4fvARB');
    if not Assigned(glProgramLocalParameter4fvARB) then Exit;
    @glGetProgramEnvParameterdvARB := SDL_GL_GetProcAddress('glGetProgramEnvParameterdvARB');
    if not Assigned(glGetProgramEnvParameterdvARB) then Exit;
    @glGetProgramEnvParameterfvARB := SDL_GL_GetProcAddress('glGetProgramEnvParameterfvARB');
    if not Assigned(glGetProgramEnvParameterfvARB) then Exit;
    @glGetProgramLocalParameterdvARB := SDL_GL_GetProcAddress('glGetProgramLocalParameterdvARB');
    if not Assigned(glGetProgramLocalParameterdvARB) then Exit;
    @glGetProgramLocalParameterfvARB := SDL_GL_GetProcAddress('glGetProgramLocalParameterfvARB');
    if not Assigned(glGetProgramLocalParameterfvARB) then Exit;
    @glGetProgramivARB := SDL_GL_GetProcAddress('glGetProgramivARB');
    if not Assigned(glGetProgramivARB) then Exit;
    @glGetProgramStringARB := SDL_GL_GetProcAddress('glGetProgramStringARB');
    if not Assigned(glGetProgramStringARB) then Exit;
    @glIsProgramARB := SDL_GL_GetProcAddress('glIsProgramARB');
    if not Assigned(glIsProgramARB) then Exit;
    Result := TRUE;
  end;

end;

function Load_GL_ATI_text_fragment_shader: Boolean;
var
  extstring : PChar;
begin

  Result := FALSE;
  extstring := glGetString( GL_EXTENSIONS );

  if glext_ExtensionSupported('GL_ATI_text_fragment_shader', extstring) then
  begin
    Result := TRUE;
  end;

end;

function Load_GL_APPLE_client_storage: Boolean;
var
  extstring : PChar;
begin

  Result := FALSE;
  extstring := glGetString( GL_EXTENSIONS );

  if glext_ExtensionSupported('GL_APPLE_client_storage', extstring) then
  begin
    Result := TRUE;
  end;

end;

function Load_GL_APPLE_element_array: Boolean;
var
  extstring : PChar;
begin

  Result := FALSE;
  extstring := glGetString( GL_EXTENSIONS );

  if glext_ExtensionSupported('GL_APPLE_element_array', extstring) then
  begin
    @glElementPointerAPPLE := SDL_GL_GetProcAddress('glElementPointerAPPLE');
    if not Assigned(glElementPointerAPPLE) then Exit;
    @glDrawElementArrayAPPLE := SDL_GL_GetProcAddress('glDrawElementArrayAPPLE');
    if not Assigned(glDrawElementArrayAPPLE) then Exit;
    @glDrawRangeElementArrayAPPLE := SDL_GL_GetProcAddress('glDrawRangeElementArrayAPPLE');
    if not Assigned(glDrawRangeElementArrayAPPLE) then Exit;
    @glMultiDrawElementArrayAPPLE := SDL_GL_GetProcAddress('glMultiDrawElementArrayAPPLE');
    if not Assigned(glMultiDrawElementArrayAPPLE) then Exit;
    @glMultiDrawRangeElementArrayAPPLE := SDL_GL_GetProcAddress('glMultiDrawRangeElementArrayAPPLE');
    if not Assigned(glMultiDrawRangeElementArrayAPPLE) then Exit;
    Result := TRUE;
  end;

end;

function Load_GL_APPLE_fence: Boolean;
var
  extstring : PChar;
begin

  Result := FALSE;
  extstring := glGetString( GL_EXTENSIONS );

  if glext_ExtensionSupported('GL_APPLE_fence', extstring) then
  begin
    @glGenFencesAPPLE := SDL_GL_GetProcAddress('glGenFencesAPPLE');
    if not Assigned(glGenFencesAPPLE) then Exit;
    @glDeleteFencesAPPLE := SDL_GL_GetProcAddress('glDeleteFencesAPPLE');
    if not Assigned(glDeleteFencesAPPLE) then Exit;
    @glSetFenceAPPLE := SDL_GL_GetProcAddress('glSetFenceAPPLE');
    if not Assigned(glSetFenceAPPLE) then Exit;
    @glIsFenceAPPLE := SDL_GL_GetProcAddress('glIsFenceAPPLE');
    if not Assigned(glIsFenceAPPLE) then Exit;
    @glTestFenceAPPLE := SDL_GL_GetProcAddress('glTestFenceAPPLE');
    if not Assigned(glTestFenceAPPLE) then Exit;
    @glFinishFenceAPPLE := SDL_GL_GetProcAddress('glFinishFenceAPPLE');
    if not Assigned(glFinishFenceAPPLE) then Exit;
    @glTestObjectAPPLE := SDL_GL_GetProcAddress('glTestObjectAPPLE');
    if not Assigned(glTestObjectAPPLE) then Exit;
    @glFinishObjectAPPLE := SDL_GL_GetProcAddress('glFinishObjectAPPLE');
    if not Assigned(glFinishObjectAPPLE) then Exit;
    Result := TRUE;
  end;

end;

function Load_GL_APPLE_vertex_array_object: Boolean;
var
  extstring : PChar;
begin

  Result := FALSE;
  extstring := glGetString( GL_EXTENSIONS );

  if glext_ExtensionSupported('GL_APPLE_vertex_array_object', extstring) then
  begin
    @glBindVertexArrayAPPLE := SDL_GL_GetProcAddress('glBindVertexArrayAPPLE');
    if not Assigned(glBindVertexArrayAPPLE) then Exit;
    @glDeleteVertexArraysAPPLE := SDL_GL_GetProcAddress('glDeleteVertexArraysAPPLE');
    if not Assigned(glDeleteVertexArraysAPPLE) then Exit;
    @glGenVertexArraysAPPLE := SDL_GL_GetProcAddress('glGenVertexArraysAPPLE');
    if not Assigned(glGenVertexArraysAPPLE) then Exit;
    @glIsVertexArrayAPPLE := SDL_GL_GetProcAddress('glIsVertexArrayAPPLE');
    if not Assigned(glIsVertexArrayAPPLE) then Exit;
    Result := TRUE;
  end;

end;

function Load_GL_APPLE_vertex_array_range: Boolean;
var
  extstring : PChar;
begin

  Result := FALSE;
  extstring := glGetString( GL_EXTENSIONS );

  if glext_ExtensionSupported('GL_APPLE_vertex_array_range', extstring) then
  begin
    @glVertexArrayRangeAPPLE := SDL_GL_GetProcAddress('glVertexArrayRangeAPPLE');
    if not Assigned(glVertexArrayRangeAPPLE) then Exit;
    @glFlushVertexArrayRangeAPPLE := SDL_GL_GetProcAddress('glFlushVertexArrayRangeAPPLE');
    if not Assigned(glFlushVertexArrayRangeAPPLE) then Exit;
    @glVertexArrayParameteriAPPLE := SDL_GL_GetProcAddress('glVertexArrayParameteriAPPLE');
    if not Assigned(glVertexArrayParameteriAPPLE) then Exit;
    Result := TRUE;
  end;

end;

{$IFDEF WINDOWS}
function Load_WGL_ARB_pixel_format: Boolean;
var
  extstring : PChar;
begin

  Result := FALSE;
  @wglGetExtensionsStringARB := SDL_GL_GetProcAddress('wglGetExtensionsStringARB');
  if not Assigned(wglGetExtensionsStringARB) then Exit;
  extstring := wglGetExtensionsStringARB(wglGetCurrentDC);

  if glext_ExtensionSupported('WGL_ARB_pixel_format', extstring) then
  begin
    @wglGetPixelFormatAttribivARB := SDL_GL_GetProcAddress('wglGetPixelFormatAttribivARB');
    if not Assigned(wglGetPixelFormatAttribivARB) then Exit;
    @wglGetPixelFormatAttribfvARB := SDL_GL_GetProcAddress('wglGetPixelFormatAttribfvARB');
    if not Assigned(wglGetPixelFormatAttribfvARB) then Exit;
    @wglChoosePixelFormatARB := SDL_GL_GetProcAddress('wglChoosePixelFormatARB');
    if not Assigned(wglChoosePixelFormatARB) then Exit;
    Result := TRUE;
  end;

end;

function Load_WGL_ARB_make_current_read: Boolean;
var
  extstring : PChar;
begin

  Result := FALSE;
  @wglGetExtensionsStringARB := SDL_GL_GetProcAddress('wglGetExtensionsStringARB');
  if not Assigned(wglGetExtensionsStringARB) then Exit;
  extstring := wglGetExtensionsStringARB(wglGetCurrentDC);

  if glext_ExtensionSupported('WGL_ARB_make_current_read', extstring) then
  begin
    @wglMakeContextCurrentARB := SDL_GL_GetProcAddress('wglMakeContextCurrentARB');
    if not Assigned(wglMakeContextCurrentARB) then Exit;
    @wglGetCurrentReadDCARB := SDL_GL_GetProcAddress('wglGetCurrentReadDCARB');
    if not Assigned(wglGetCurrentReadDCARB) then Exit;
    Result := TRUE;
  end;

end;

function Load_WGL_ARB_pbuffer: Boolean;
var
  extstring : PChar;
begin

  Result := FALSE;
  @wglGetExtensionsStringARB := SDL_GL_GetProcAddress('wglGetExtensionsStringARB');
  if not Assigned(wglGetExtensionsStringARB) then Exit;
  extstring := wglGetExtensionsStringARB(wglGetCurrentDC);

  if glext_ExtensionSupported('WGL_ARB_pbuffer', extstring) then
  begin
    @wglCreatePbufferARB := SDL_GL_GetProcAddress('wglCreatePbufferARB');
    if not Assigned(wglCreatePbufferARB) then Exit;
    @wglGetPbufferDCARB := SDL_GL_GetProcAddress('wglGetPbufferDCARB');
    if not Assigned(wglGetPbufferDCARB) then Exit;
    @wglReleasePbufferDCARB := SDL_GL_GetProcAddress('wglReleasePbufferDCARB');
    if not Assigned(wglReleasePbufferDCARB) then Exit;
    @wglDestroyPbufferARB := SDL_GL_GetProcAddress('wglDestroyPbufferARB');
    if not Assigned(wglDestroyPbufferARB) then Exit;
    @wglQueryPbufferARB := SDL_GL_GetProcAddress('wglQueryPbufferARB');
    if not Assigned(wglQueryPbufferARB) then Exit;
    Result := TRUE;
  end;

end;

function Load_WGL_EXT_swap_control: Boolean;
var
  extstring : PChar;
begin

  Result := FALSE;
  @wglGetExtensionsStringARB := SDL_GL_GetProcAddress('wglGetExtensionsStringARB');
  if not Assigned(wglGetExtensionsStringARB) then Exit;
  extstring := wglGetExtensionsStringARB(wglGetCurrentDC);

  if glext_ExtensionSupported('WGL_EXT_swap_control', extstring) then
  begin
    @wglSwapIntervalEXT := SDL_GL_GetProcAddress('wglSwapIntervalEXT');
    if not Assigned(wglSwapIntervalEXT) then Exit;
    @wglGetSwapIntervalEXT := SDL_GL_GetProcAddress('wglGetSwapIntervalEXT');
    if not Assigned(wglGetSwapIntervalEXT) then Exit;
    Result := TRUE;
  end;

end;

function Load_WGL_ARB_render_texture: Boolean;
var
  extstring : PChar;
begin

  Result := FALSE;
  @wglGetExtensionsStringARB := SDL_GL_GetProcAddress('wglGetExtensionsStringARB');
  if not Assigned(wglGetExtensionsStringARB) then Exit;
  extstring := wglGetExtensionsStringARB(wglGetCurrentDC);

  if glext_ExtensionSupported('WGL_ARB_render_texture', extstring) then
  begin
    @wglBindTexImageARB := SDL_GL_GetProcAddress('wglBindTexImageARB');
    if not Assigned(wglBindTexImageARB) then Exit;
    @wglReleaseTexImageARB := SDL_GL_GetProcAddress('wglReleaseTexImageARB');
    if not Assigned(wglReleaseTexImageARB) then Exit;
    @wglSetPbufferAttribARB := SDL_GL_GetProcAddress('wglSetPbufferAttribARB');
    if not Assigned(wglSetPbufferAttribARB) then Exit;
    Result := TRUE;
  end;

end;

function Load_WGL_EXT_extensions_string: Boolean;
var
  extstring : PChar;
begin

  Result := FALSE;
  @wglGetExtensionsStringARB := SDL_GL_GetProcAddress('wglGetExtensionsStringARB');
  if not Assigned(wglGetExtensionsStringARB) then Exit;
  extstring := wglGetExtensionsStringARB(wglGetCurrentDC);

  if glext_ExtensionSupported('WGL_EXT_extensions_string', extstring) then
  begin
    @wglGetExtensionsStringEXT := SDL_GL_GetProcAddress('wglGetExtensionsStringEXT');
    if not Assigned(wglGetExtensionsStringEXT) then Exit;
    Result := TRUE;
  end;

end;

function Load_WGL_EXT_make_current_read: Boolean;
var
  extstring : PChar;
begin

  Result := FALSE;
  @wglGetExtensionsStringARB := SDL_GL_GetProcAddress('wglGetExtensionsStringARB');
  if not Assigned(wglGetExtensionsStringARB) then Exit;
  extstring := wglGetExtensionsStringARB(wglGetCurrentDC);

  if glext_ExtensionSupported('WGL_EXT_make_current_read', extstring) then
  begin
    @wglMakeContextCurrentEXT := SDL_GL_GetProcAddress('wglMakeContextCurrentEXT');
    if not Assigned(wglMakeContextCurrentEXT) then Exit;
    @wglGetCurrentReadDCEXT := SDL_GL_GetProcAddress('wglGetCurrentReadDCEXT');
    if not Assigned(wglGetCurrentReadDCEXT) then Exit;
    Result := TRUE;
  end;

end;

function Load_WGL_EXT_pbuffer: Boolean;
var
  extstring : PChar;
begin

  Result := FALSE;
  @wglGetExtensionsStringARB := SDL_GL_GetProcAddress('wglGetExtensionsStringARB');
  if not Assigned(wglGetExtensionsStringARB) then Exit;
  extstring := wglGetExtensionsStringARB(wglGetCurrentDC);

  if glext_ExtensionSupported('WGL_EXT_pbuffer', extstring) then
  begin
    @wglCreatePbufferEXT := SDL_GL_GetProcAddress('wglCreatePbufferEXT');
    if not Assigned(wglCreatePbufferEXT) then Exit;
    @wglGetPbufferDCEXT := SDL_GL_GetProcAddress('wglGetPbufferDCEXT');
    if not Assigned(wglGetPbufferDCEXT) then Exit;
    @wglReleasePbufferDCEXT := SDL_GL_GetProcAddress('wglReleasePbufferDCEXT');
    if not Assigned(wglReleasePbufferDCEXT) then Exit;
    @wglDestroyPbufferEXT := SDL_GL_GetProcAddress('wglDestroyPbufferEXT');
    if not Assigned(wglDestroyPbufferEXT) then Exit;
    @wglQueryPbufferEXT := SDL_GL_GetProcAddress('wglQueryPbufferEXT');
    if not Assigned(wglQueryPbufferEXT) then Exit;
    Result := TRUE;
  end;

end;

function Load_WGL_EXT_pixel_format: Boolean;
var
  extstring : PChar;
begin

  Result := FALSE;
  @wglGetExtensionsStringARB := SDL_GL_GetProcAddress('wglGetExtensionsStringARB');
  if not Assigned(wglGetExtensionsStringARB) then Exit;
  extstring := wglGetExtensionsStringARB(wglGetCurrentDC);

  if glext_ExtensionSupported('WGL_EXT_pixel_format', extstring) then
  begin
    @wglGetPixelFormatAttribivEXT := SDL_GL_GetProcAddress('wglGetPixelFormatAttribivEXT');
    if not Assigned(wglGetPixelFormatAttribivEXT) then Exit;
    @wglGetPixelFormatAttribfvEXT := SDL_GL_GetProcAddress('wglGetPixelFormatAttribfvEXT');
    if not Assigned(wglGetPixelFormatAttribfvEXT) then Exit;
    @wglChoosePixelFormatEXT := SDL_GL_GetProcAddress('wglChoosePixelFormatEXT');
    if not Assigned(wglChoosePixelFormatEXT) then Exit;
    Result := TRUE;
  end;

end;

function Load_WGL_I3D_digital_video_control: Boolean;
var
  extstring : PChar;
begin

  Result := FALSE;
  @wglGetExtensionsStringARB := SDL_GL_GetProcAddress('wglGetExtensionsStringARB');
  if not Assigned(wglGetExtensionsStringARB) then Exit;
  extstring := wglGetExtensionsStringARB(wglGetCurrentDC);

  if glext_ExtensionSupported('WGL_I3D_digital_video_control', extstring) then
  begin
    @wglGetDigitalVideoParametersI3D := SDL_GL_GetProcAddress('wglGetDigitalVideoParametersI3D');
    if not Assigned(wglGetDigitalVideoParametersI3D) then Exit;
    @wglSetDigitalVideoParametersI3D := SDL_GL_GetProcAddress('wglSetDigitalVideoParametersI3D');
    if not Assigned(wglSetDigitalVideoParametersI3D) then Exit;
    Result := TRUE;
  end;

end;

function Load_WGL_I3D_gamma: Boolean;
var
  extstring : PChar;
begin

  Result := FALSE;
  @wglGetExtensionsStringARB := SDL_GL_GetProcAddress('wglGetExtensionsStringARB');
  if not Assigned(wglGetExtensionsStringARB) then Exit;
  extstring := wglGetExtensionsStringARB(wglGetCurrentDC);

  if glext_ExtensionSupported('WGL_I3D_gamma', extstring) then
  begin
    @wglGetGammaTableParametersI3D := SDL_GL_GetProcAddress('wglGetGammaTableParametersI3D');
    if not Assigned(wglGetGammaTableParametersI3D) then Exit;
    @wglSetGammaTableParametersI3D := SDL_GL_GetProcAddress('wglSetGammaTableParametersI3D');
    if not Assigned(wglSetGammaTableParametersI3D) then Exit;
    @wglGetGammaTableI3D := SDL_GL_GetProcAddress('wglGetGammaTableI3D');
    if not Assigned(wglGetGammaTableI3D) then Exit;
    @wglSetGammaTableI3D := SDL_GL_GetProcAddress('wglSetGammaTableI3D');
    if not Assigned(wglSetGammaTableI3D) then Exit;
    Result := TRUE;
  end;

end;

function Load_WGL_I3D_genlock: Boolean;
var
  extstring : PChar;
begin

  Result := FALSE;
  @wglGetExtensionsStringARB := SDL_GL_GetProcAddress('wglGetExtensionsStringARB');
  if not Assigned(wglGetExtensionsStringARB) then Exit;
  extstring := wglGetExtensionsStringARB(wglGetCurrentDC);

  if glext_ExtensionSupported('WGL_I3D_genlock', extstring) then
  begin
    @wglEnableGenlockI3D := SDL_GL_GetProcAddress('wglEnableGenlockI3D');
    if not Assigned(wglEnableGenlockI3D) then Exit;
    @wglDisableGenlockI3D := SDL_GL_GetProcAddress('wglDisableGenlockI3D');
    if not Assigned(wglDisableGenlockI3D) then Exit;
    @wglIsEnabledGenlockI3D := SDL_GL_GetProcAddress('wglIsEnabledGenlockI3D');
    if not Assigned(wglIsEnabledGenlockI3D) then Exit;
    @wglGenlockSourceI3D := SDL_GL_GetProcAddress('wglGenlockSourceI3D');
    if not Assigned(wglGenlockSourceI3D) then Exit;
    @wglGetGenlockSourceI3D := SDL_GL_GetProcAddress('wglGetGenlockSourceI3D');
    if not Assigned(wglGetGenlockSourceI3D) then Exit;
    @wglGenlockSourceEdgeI3D := SDL_GL_GetProcAddress('wglGenlockSourceEdgeI3D');
    if not Assigned(wglGenlockSourceEdgeI3D) then Exit;
    @wglGetGenlockSourceEdgeI3D := SDL_GL_GetProcAddress('wglGetGenlockSourceEdgeI3D');
    if not Assigned(wglGetGenlockSourceEdgeI3D) then Exit;
    @wglGenlockSampleRateI3D := SDL_GL_GetProcAddress('wglGenlockSampleRateI3D');
    if not Assigned(wglGenlockSampleRateI3D) then Exit;
    @wglGetGenlockSampleRateI3D := SDL_GL_GetProcAddress('wglGetGenlockSampleRateI3D');
    if not Assigned(wglGetGenlockSampleRateI3D) then Exit;
    @wglGenlockSourceDelayI3D := SDL_GL_GetProcAddress('wglGenlockSourceDelayI3D');
    if not Assigned(wglGenlockSourceDelayI3D) then Exit;
    @wglGetGenlockSourceDelayI3D := SDL_GL_GetProcAddress('wglGetGenlockSourceDelayI3D');
    if not Assigned(wglGetGenlockSourceDelayI3D) then Exit;
    @wglQueryGenlockMaxSourceDelayI3D := SDL_GL_GetProcAddress('wglQueryGenlockMaxSourceDelayI3D');
    if not Assigned(wglQueryGenlockMaxSourceDelayI3D) then Exit;
    Result := TRUE;
  end;

end;
{$ENDIF}

function Load_GL_ARB_matrix_palette: Boolean;
var
  extstring : PChar;
begin

  Result := FALSE;
  extstring := glGetString( GL_EXTENSIONS );

  if glext_ExtensionSupported('GL_ARB_matrix_palette', extstring) then
  begin
    @glCurrentPaletteMatrixARB := SDL_GL_GetProcAddress('glCurrentPaletteMatrixARB');
    if not Assigned(glCurrentPaletteMatrixARB) then Exit;
    @glMatrixIndexubvARB := SDL_GL_GetProcAddress('glMatrixIndexubvARB');
    if not Assigned(glMatrixIndexubvARB) then Exit;
    @glMatrixIndexusvARB := SDL_GL_GetProcAddress('glMatrixIndexusvARB');
    if not Assigned(glMatrixIndexusvARB) then Exit;
    @glMatrixIndexuivARB := SDL_GL_GetProcAddress('glMatrixIndexuivARB');
    if not Assigned(glMatrixIndexuivARB) then Exit;
    @glMatrixIndexPointerARB := SDL_GL_GetProcAddress('glMatrixIndexPointerARB');
    if not Assigned(glMatrixIndexPointerARB) then Exit;
    Result := TRUE;
  end;

end;

function Load_GL_NV_element_array: Boolean;
var
  extstring : PChar;
begin

  Result := FALSE;
  extstring := glGetString( GL_EXTENSIONS );

  if glext_ExtensionSupported('GL_NV_element_array', extstring) then
  begin
    @glElementPointerNV := SDL_GL_GetProcAddress('glElementPointerNV');
    if not Assigned(glElementPointerNV) then Exit;
    @glDrawElementArrayNV := SDL_GL_GetProcAddress('glDrawElementArrayNV');
    if not Assigned(glDrawElementArrayNV) then Exit;
    @glDrawRangeElementArrayNV := SDL_GL_GetProcAddress('glDrawRangeElementArrayNV');
    if not Assigned(glDrawRangeElementArrayNV) then Exit;
    @glMultiDrawElementArrayNV := SDL_GL_GetProcAddress('glMultiDrawElementArrayNV');
    if not Assigned(glMultiDrawElementArrayNV) then Exit;
    @glMultiDrawRangeElementArrayNV := SDL_GL_GetProcAddress('glMultiDrawRangeElementArrayNV');
    if not Assigned(glMultiDrawRangeElementArrayNV) then Exit;
    Result := TRUE;
  end;

end;

function Load_GL_NV_float_buffer: Boolean;
var
  extstring : PChar;
begin

  Result := FALSE;
  extstring := glGetString( GL_EXTENSIONS );

  if glext_ExtensionSupported('GL_NV_float_buffer', extstring) then
  begin
    Result := TRUE;
  end;

end;

function Load_GL_NV_fragment_program: Boolean;
var
  extstring : PChar;
begin

  Result := FALSE;
  extstring := glGetString( GL_EXTENSIONS );

  if glext_ExtensionSupported('GL_NV_fragment_program', extstring) then
  begin
    @glProgramNamedParameter4fNV := SDL_GL_GetProcAddress('glProgramNamedParameter4fNV');
    if not Assigned(glProgramNamedParameter4fNV) then Exit;
    @glProgramNamedParameter4dNV := SDL_GL_GetProcAddress('glProgramNamedParameter4dNV');
    if not Assigned(glProgramNamedParameter4dNV) then Exit;
    @glGetProgramNamedParameterfvNV := SDL_GL_GetProcAddress('glGetProgramNamedParameterfvNV');
    if not Assigned(glGetProgramNamedParameterfvNV) then Exit;
    @glGetProgramNamedParameterdvNV := SDL_GL_GetProcAddress('glGetProgramNamedParameterdvNV');
    if not Assigned(glGetProgramNamedParameterdvNV) then Exit;
    @glProgramLocalParameter4dARB := SDL_GL_GetProcAddress('glProgramLocalParameter4dARB');
    if not Assigned(glProgramLocalParameter4dARB) then Exit;
    @glProgramLocalParameter4dvARB := SDL_GL_GetProcAddress('glProgramLocalParameter4dvARB');
    if not Assigned(glProgramLocalParameter4dvARB) then Exit;
    @glProgramLocalParameter4fARB := SDL_GL_GetProcAddress('glProgramLocalParameter4fARB');
    if not Assigned(glProgramLocalParameter4fARB) then Exit;
    @glProgramLocalParameter4fvARB := SDL_GL_GetProcAddress('glProgramLocalParameter4fvARB');
    if not Assigned(glProgramLocalParameter4fvARB) then Exit;
    @glGetProgramLocalParameterdvARB := SDL_GL_GetProcAddress('glGetProgramLocalParameterdvARB');
    if not Assigned(glGetProgramLocalParameterdvARB) then Exit;
    @glGetProgramLocalParameterfvARB := SDL_GL_GetProcAddress('glGetProgramLocalParameterfvARB');
    if not Assigned(glGetProgramLocalParameterfvARB) then Exit;
    Result := TRUE;
  end;

end;

function Load_GL_NV_primitive_restart: Boolean;
var
  extstring : PChar;
begin

  Result := FALSE;
  extstring := glGetString( GL_EXTENSIONS );

  if glext_ExtensionSupported('GL_NV_primitive_restart', extstring) then
  begin
    @glPrimitiveRestartNV := SDL_GL_GetProcAddress('glPrimitiveRestartNV');
    if not Assigned(glPrimitiveRestartNV) then Exit;
    @glPrimitiveRestartIndexNV := SDL_GL_GetProcAddress('glPrimitiveRestartIndexNV');
    if not Assigned(glPrimitiveRestartIndexNV) then Exit;
    Result := TRUE;
  end;

end;

function Load_GL_NV_vertex_program2: Boolean;
var
  extstring : PChar;
begin

  Result := FALSE;
  extstring := glGetString( GL_EXTENSIONS );

  if glext_ExtensionSupported('GL_NV_vertex_program2', extstring) then
  begin
    Result := TRUE;
  end;

end;

{$IFDEF WINDOWS}
function Load_WGL_NV_render_texture_rectangle: Boolean;
var
  extstring : PChar;
begin

  Result := FALSE;
  @wglGetExtensionsStringARB := SDL_GL_GetProcAddress('wglGetExtensionsStringARB');
  if not Assigned(wglGetExtensionsStringARB) then Exit;
  extstring := wglGetExtensionsStringARB(wglGetCurrentDC);

  if glext_ExtensionSupported('WGL_NV_render_texture_rectangle', extstring) then
  begin
    Result := TRUE;
  end;

end;
{$ENDIF}

function Load_GL_NV_pixel_data_range: Boolean;
var
  extstring : PChar;
begin

  Result := FALSE;
  extstring := glGetString( GL_EXTENSIONS );

  if glext_ExtensionSupported('GL_NV_pixel_data_range', extstring) then
  begin
    @glPixelDataRangeNV := SDL_GL_GetProcAddress('glPixelDataRangeNV');
    if not Assigned(glPixelDataRangeNV) then Exit;
    @glFlushPixelDataRangeNV := SDL_GL_GetProcAddress('glFlushPixelDataRangeNV');
    if not Assigned(glFlushPixelDataRangeNV) then Exit;
    {$IFDEF WINDOWS}
    @wglAllocateMemoryNV := SDL_GL_GetProcAddress('wglAllocateMemoryNV');
    if not Assigned(wglAllocateMemoryNV) then Exit;
    @wglFreeMemoryNV := SDL_GL_GetProcAddress('wglFreeMemoryNV');
    if not Assigned(wglFreeMemoryNV) then Exit;
    {$ENDIF}
    Result := TRUE;
  end;

end;

function Load_GL_EXT_texture_rectangle: Boolean;
var
  extstring : PChar;
begin

  Result := FALSE;
  extstring := glGetString( GL_EXTENSIONS );

  if glext_ExtensionSupported('GL_EXT_texture_rectangle', extstring) then
  begin
    Result := TRUE;
  end;

end;

function Load_GL_S3_s3tc: Boolean;
var
  extstring : PChar;
begin

  Result := FALSE;
  extstring := glGetString( GL_EXTENSIONS );

  if glext_ExtensionSupported('GL_S3_s3tc', extstring) then
  begin
    Result := TRUE;
  end;

end;

function Load_GL_ATI_draw_buffers: Boolean;
var
  extstring : PChar;
begin

  Result := FALSE;
  extstring := glGetString( GL_EXTENSIONS );

  if glext_ExtensionSupported('GL_ATI_draw_buffers', extstring) then
  begin
    @glDrawBuffersATI := SDL_GL_GetProcAddress('glDrawBuffersATI');
    if not Assigned(glDrawBuffersATI) then Exit;
    Result := TRUE;
  end;

end;

{$IFDEF WINDOWS}
function Load_WGL_ATI_pixel_format_float: Boolean;
var
  extstring : PChar;
begin

  Result := FALSE;
  @wglGetExtensionsStringARB := SDL_GL_GetProcAddress('wglGetExtensionsStringARB');
  if not Assigned(wglGetExtensionsStringARB) then Exit;
  extstring := wglGetExtensionsStringARB(wglGetCurrentDC);

  if glext_ExtensionSupported('WGL_ATI_pixel_format_float', extstring) then
  begin
    Result := TRUE;
  end;

end;
{$ENDIF}

function Load_GL_ATI_texture_env_combine3: Boolean;
var
  extstring : PChar;
begin

  Result := FALSE;
  extstring := glGetString( GL_EXTENSIONS );

  if glext_ExtensionSupported('GL_ATI_texture_env_combine3', extstring) then
  begin
    Result := TRUE;
  end;

end;

function Load_GL_ATI_texture_float: Boolean;
var
  extstring : PChar;
begin

  Result := FALSE;
  extstring := glGetString( GL_EXTENSIONS );

  if glext_ExtensionSupported('GL_ATI_texture_float', extstring) then
  begin
    Result := TRUE;
  end;

end;

function Load_GL_NV_texture_expand_normal: Boolean;
var
  extstring : PChar;
begin

  Result := FALSE;
  extstring := glGetString( GL_EXTENSIONS );

  if glext_ExtensionSupported('GL_NV_texture_expand_normal', extstring) then
  begin
    Result := TRUE;
  end;

end;

function Load_GL_NV_half_float: Boolean;
var
  extstring : PChar;
begin

  Result := FALSE;
  extstring := glGetString( GL_EXTENSIONS );

  if glext_ExtensionSupported('GL_NV_half_float', extstring) then
  begin
    @glVertex2hNV := SDL_GL_GetProcAddress('glVertex2hNV');
    if not Assigned(glVertex2hNV) then Exit;
    @glVertex2hvNV := SDL_GL_GetProcAddress('glVertex2hvNV');
    if not Assigned(glVertex2hvNV) then Exit;
    @glVertex3hNV := SDL_GL_GetProcAddress('glVertex3hNV');
    if not Assigned(glVertex3hNV) then Exit;
    @glVertex3hvNV := SDL_GL_GetProcAddress('glVertex3hvNV');
    if not Assigned(glVertex3hvNV) then Exit;
    @glVertex4hNV := SDL_GL_GetProcAddress('glVertex4hNV');
    if not Assigned(glVertex4hNV) then Exit;
    @glVertex4hvNV := SDL_GL_GetProcAddress('glVertex4hvNV');
    if not Assigned(glVertex4hvNV) then Exit;
    @glNormal3hNV := SDL_GL_GetProcAddress('glNormal3hNV');
    if not Assigned(glNormal3hNV) then Exit;
    @glNormal3hvNV := SDL_GL_GetProcAddress('glNormal3hvNV');
    if not Assigned(glNormal3hvNV) then Exit;
    @glColor3hNV := SDL_GL_GetProcAddress('glColor3hNV');
    if not Assigned(glColor3hNV) then Exit;
    @glColor3hvNV := SDL_GL_GetProcAddress('glColor3hvNV');
    if not Assigned(glColor3hvNV) then Exit;
    @glColor4hNV := SDL_GL_GetProcAddress('glColor4hNV');
    if not Assigned(glColor4hNV) then Exit;
    @glColor4hvNV := SDL_GL_GetProcAddress('glColor4hvNV');
    if not Assigned(glColor4hvNV) then Exit;
    @glTexCoord1hNV := SDL_GL_GetProcAddress('glTexCoord1hNV');
    if not Assigned(glTexCoord1hNV) then Exit;
    @glTexCoord1hvNV := SDL_GL_GetProcAddress('glTexCoord1hvNV');
    if not Assigned(glTexCoord1hvNV) then Exit;
    @glTexCoord2hNV := SDL_GL_GetProcAddress('glTexCoord2hNV');
    if not Assigned(glTexCoord2hNV) then Exit;
    @glTexCoord2hvNV := SDL_GL_GetProcAddress('glTexCoord2hvNV');
    if not Assigned(glTexCoord2hvNV) then Exit;
    @glTexCoord3hNV := SDL_GL_GetProcAddress('glTexCoord3hNV');
    if not Assigned(glTexCoord3hNV) then Exit;
    @glTexCoord3hvNV := SDL_GL_GetProcAddress('glTexCoord3hvNV');
    if not Assigned(glTexCoord3hvNV) then Exit;
    @glTexCoord4hNV := SDL_GL_GetProcAddress('glTexCoord4hNV');
    if not Assigned(glTexCoord4hNV) then Exit;
    @glTexCoord4hvNV := SDL_GL_GetProcAddress('glTexCoord4hvNV');
    if not Assigned(glTexCoord4hvNV) then Exit;
    @glMultiTexCoord1hNV := SDL_GL_GetProcAddress('glMultiTexCoord1hNV');
    if not Assigned(glMultiTexCoord1hNV) then Exit;
    @glMultiTexCoord1hvNV := SDL_GL_GetProcAddress('glMultiTexCoord1hvNV');
    if not Assigned(glMultiTexCoord1hvNV) then Exit;
    @glMultiTexCoord2hNV := SDL_GL_GetProcAddress('glMultiTexCoord2hNV');
    if not Assigned(glMultiTexCoord2hNV) then Exit;
    @glMultiTexCoord2hvNV := SDL_GL_GetProcAddress('glMultiTexCoord2hvNV');
    if not Assigned(glMultiTexCoord2hvNV) then Exit;
    @glMultiTexCoord3hNV := SDL_GL_GetProcAddress('glMultiTexCoord3hNV');
    if not Assigned(glMultiTexCoord3hNV) then Exit;
    @glMultiTexCoord3hvNV := SDL_GL_GetProcAddress('glMultiTexCoord3hvNV');
    if not Assigned(glMultiTexCoord3hvNV) then Exit;
    @glMultiTexCoord4hNV := SDL_GL_GetProcAddress('glMultiTexCoord4hNV');
    if not Assigned(glMultiTexCoord4hNV) then Exit;
    @glMultiTexCoord4hvNV := SDL_GL_GetProcAddress('glMultiTexCoord4hvNV');
    if not Assigned(glMultiTexCoord4hvNV) then Exit;
    @glFogCoordhNV := SDL_GL_GetProcAddress('glFogCoordhNV');
    if not Assigned(glFogCoordhNV) then Exit;
    @glFogCoordhvNV := SDL_GL_GetProcAddress('glFogCoordhvNV');
    if not Assigned(glFogCoordhvNV) then Exit;
    @glSecondaryColor3hNV := SDL_GL_GetProcAddress('glSecondaryColor3hNV');
    if not Assigned(glSecondaryColor3hNV) then Exit;
    @glSecondaryColor3hvNV := SDL_GL_GetProcAddress('glSecondaryColor3hvNV');
    if not Assigned(glSecondaryColor3hvNV) then Exit;
    @glVertexWeighthNV := SDL_GL_GetProcAddress('glVertexWeighthNV');
    if not Assigned(glVertexWeighthNV) then Exit;
    @glVertexWeighthvNV := SDL_GL_GetProcAddress('glVertexWeighthvNV');
    if not Assigned(glVertexWeighthvNV) then Exit;
    @glVertexAttrib1hNV := SDL_GL_GetProcAddress('glVertexAttrib1hNV');
    if not Assigned(glVertexAttrib1hNV) then Exit;
    @glVertexAttrib1hvNV := SDL_GL_GetProcAddress('glVertexAttrib1hvNV');
    if not Assigned(glVertexAttrib1hvNV) then Exit;
    @glVertexAttrib2hNV := SDL_GL_GetProcAddress('glVertexAttrib2hNV');
    if not Assigned(glVertexAttrib2hNV) then Exit;
    @glVertexAttrib2hvNV := SDL_GL_GetProcAddress('glVertexAttrib2hvNV');
    if not Assigned(glVertexAttrib2hvNV) then Exit;
    @glVertexAttrib3hNV := SDL_GL_GetProcAddress('glVertexAttrib3hNV');
    if not Assigned(glVertexAttrib3hNV) then Exit;
    @glVertexAttrib3hvNV := SDL_GL_GetProcAddress('glVertexAttrib3hvNV');
    if not Assigned(glVertexAttrib3hvNV) then Exit;
    @glVertexAttrib4hNV := SDL_GL_GetProcAddress('glVertexAttrib4hNV');
    if not Assigned(glVertexAttrib4hNV) then Exit;
    @glVertexAttrib4hvNV := SDL_GL_GetProcAddress('glVertexAttrib4hvNV');
    if not Assigned(glVertexAttrib4hvNV) then Exit;
    @glVertexAttribs1hvNV := SDL_GL_GetProcAddress('glVertexAttribs1hvNV');
    if not Assigned(glVertexAttribs1hvNV) then Exit;
    @glVertexAttribs2hvNV := SDL_GL_GetProcAddress('glVertexAttribs2hvNV');
    if not Assigned(glVertexAttribs2hvNV) then Exit;
    @glVertexAttribs3hvNV := SDL_GL_GetProcAddress('glVertexAttribs3hvNV');
    if not Assigned(glVertexAttribs3hvNV) then Exit;
    @glVertexAttribs4hvNV := SDL_GL_GetProcAddress('glVertexAttribs4hvNV');
    if not Assigned(glVertexAttribs4hvNV) then Exit;
    Result := TRUE;
  end;

end;

function Load_GL_ATI_map_object_buffer: Boolean;
var
  extstring : PChar;
begin

  Result := FALSE;
  extstring := glGetString( GL_EXTENSIONS );

  if glext_ExtensionSupported('GL_ATI_map_object_buffer', extstring) then
  begin
    @glMapObjectBufferATI := SDL_GL_GetProcAddress('glMapObjectBufferATI');
    if not Assigned(glMapObjectBufferATI) then Exit;
    @glUnmapObjectBufferATI := SDL_GL_GetProcAddress('glUnmapObjectBufferATI');
    if not Assigned(glUnmapObjectBufferATI) then Exit;
    Result := TRUE;
  end;

end;

function Load_GL_ATI_separate_stencil: Boolean;
var
  extstring : PChar;
begin

  Result := FALSE;
  extstring := glGetString( GL_EXTENSIONS );

  if glext_ExtensionSupported('GL_ATI_separate_stencil', extstring) then
  begin
    @glStencilOpSeparateATI := SDL_GL_GetProcAddress('glStencilOpSeparateATI');
    if not Assigned(glStencilOpSeparateATI) then Exit;
    @glStencilFuncSeparateATI := SDL_GL_GetProcAddress('glStencilFuncSeparateATI');
    if not Assigned(glStencilFuncSeparateATI) then Exit;
    Result := TRUE;
  end;

end;

function Load_GL_ATI_vertex_attrib_array_object: Boolean;
var
  extstring : PChar;
begin

  Result := FALSE;
  extstring := glGetString( GL_EXTENSIONS );

  if glext_ExtensionSupported('GL_ATI_vertex_attrib_array_object', extstring) then
  begin
    @glVertexAttribArrayObjectATI := SDL_GL_GetProcAddress('glVertexAttribArrayObjectATI');
    if not Assigned(glVertexAttribArrayObjectATI) then Exit;
    @glGetVertexAttribArrayObjectfvATI := SDL_GL_GetProcAddress('glGetVertexAttribArrayObjectfvATI');
    if not Assigned(glGetVertexAttribArrayObjectfvATI) then Exit;
    @glGetVertexAttribArrayObjectivATI := SDL_GL_GetProcAddress('glGetVertexAttribArrayObjectivATI');
    if not Assigned(glGetVertexAttribArrayObjectivATI) then Exit;
    Result := TRUE;
  end;

end;

function Load_GL_ARB_vertex_buffer_object: Boolean;
var
  extstring : PChar;
begin

  Result := FALSE;
  extstring := glGetString( GL_EXTENSIONS );

  if glext_ExtensionSupported('GL_ARB_vertex_buffer_object', extstring) then
  begin
    @glBindBufferARB := SDL_GL_GetProcAddress('glBindBufferARB');
    if not Assigned(glBindBufferARB) then Exit;
    @glDeleteBuffersARB := SDL_GL_GetProcAddress('glDeleteBuffersARB');
    if not Assigned(glDeleteBuffersARB) then Exit;
    @glGenBuffersARB := SDL_GL_GetProcAddress('glGenBuffersARB');
    if not Assigned(glGenBuffersARB) then Exit;
    @glIsBufferARB := SDL_GL_GetProcAddress('glIsBufferARB');
    if not Assigned(glIsBufferARB) then Exit;
    @glBufferDataARB := SDL_GL_GetProcAddress('glBufferDataARB');
    if not Assigned(glBufferDataARB) then Exit;
    @glBufferSubDataARB := SDL_GL_GetProcAddress('glBufferSubDataARB');
    if not Assigned(glBufferSubDataARB) then Exit;
    @glGetBufferSubDataARB := SDL_GL_GetProcAddress('glGetBufferSubDataARB');
    if not Assigned(glGetBufferSubDataARB) then Exit;
    @glMapBufferARB := SDL_GL_GetProcAddress('glMapBufferARB');
    if not Assigned(glMapBufferARB) then Exit;
    @glUnmapBufferARB := SDL_GL_GetProcAddress('glUnmapBufferARB');
    if not Assigned(glUnmapBufferARB) then Exit;
    @glGetBufferParameterivARB := SDL_GL_GetProcAddress('glGetBufferParameterivARB');
    if not Assigned(glGetBufferParameterivARB) then Exit;
    @glGetBufferPointervARB := SDL_GL_GetProcAddress('glGetBufferPointervARB');
    if not Assigned(glGetBufferPointervARB) then Exit;
    Result := TRUE;
  end;

end;

function Load_GL_ARB_occlusion_query: Boolean;
var
  extstring : PChar;
begin

  Result := FALSE;
  extstring := glGetString( GL_EXTENSIONS );

  if glext_ExtensionSupported('GL_ARB_occlusion_query', extstring) then
  begin
    @glGenQueriesARB := SDL_GL_GetProcAddress('glGenQueriesARB');
    if not Assigned(glGenQueriesARB) then Exit;
    @glDeleteQueriesARB := SDL_GL_GetProcAddress('glDeleteQueriesARB');
    if not Assigned(glDeleteQueriesARB) then Exit;
    @glIsQueryARB := SDL_GL_GetProcAddress('glIsQueryARB');
    if not Assigned(glIsQueryARB) then Exit;
    @glBeginQueryARB := SDL_GL_GetProcAddress('glBeginQueryARB');
    if not Assigned(glBeginQueryARB) then Exit;
    @glEndQueryARB := SDL_GL_GetProcAddress('glEndQueryARB');
    if not Assigned(glEndQueryARB) then Exit;
    @glGetQueryivARB := SDL_GL_GetProcAddress('glGetQueryivARB');
    if not Assigned(glGetQueryivARB) then Exit;
    @glGetQueryObjectivARB := SDL_GL_GetProcAddress('glGetQueryObjectivARB');
    if not Assigned(glGetQueryObjectivARB) then Exit;
    @glGetQueryObjectuivARB := SDL_GL_GetProcAddress('glGetQueryObjectuivARB');
    if not Assigned(glGetQueryObjectuivARB) then Exit;
    Result := TRUE;
  end;

end;

function Load_GL_ARB_shader_objects: Boolean;
var
  extstring : PChar;
begin

  Result := FALSE;
  extstring := glGetString( GL_EXTENSIONS );

  if glext_ExtensionSupported('GL_ARB_shader_objects', extstring) then
  begin
    @glDeleteObjectARB := SDL_GL_GetProcAddress('glDeleteObjectARB');
    if not Assigned(glDeleteObjectARB) then Exit;
    @glGetHandleARB := SDL_GL_GetProcAddress('glGetHandleARB');
    if not Assigned(glGetHandleARB) then Exit;
    @glDetachObjectARB := SDL_GL_GetProcAddress('glDetachObjectARB');
    if not Assigned(glDetachObjectARB) then Exit;
    @glCreateShaderObjectARB := SDL_GL_GetProcAddress('glCreateShaderObjectARB');
    if not Assigned(glCreateShaderObjectARB) then Exit;
    @glShaderSourceARB := SDL_GL_GetProcAddress('glShaderSourceARB');
    if not Assigned(glShaderSourceARB) then Exit;
    @glCompileShaderARB := SDL_GL_GetProcAddress('glCompileShaderARB');
    if not Assigned(glCompileShaderARB) then Exit;
    @glCreateProgramObjectARB := SDL_GL_GetProcAddress('glCreateProgramObjectARB');
    if not Assigned(glCreateProgramObjectARB) then Exit;
    @glAttachObjectARB := SDL_GL_GetProcAddress('glAttachObjectARB');
    if not Assigned(glAttachObjectARB) then Exit;
    @glLinkProgramARB := SDL_GL_GetProcAddress('glLinkProgramARB');
    if not Assigned(glLinkProgramARB) then Exit;
    @glUseProgramObjectARB := SDL_GL_GetProcAddress('glUseProgramObjectARB');
    if not Assigned(glUseProgramObjectARB) then Exit;
    @glValidateProgramARB := SDL_GL_GetProcAddress('glValidateProgramARB');
    if not Assigned(glValidateProgramARB) then Exit;
    @glUniform1fARB := SDL_GL_GetProcAddress('glUniform1fARB');
    if not Assigned(glUniform1fARB) then Exit;
    @glUniform2fARB := SDL_GL_GetProcAddress('glUniform2fARB');
    if not Assigned(glUniform2fARB) then Exit;
    @glUniform3fARB := SDL_GL_GetProcAddress('glUniform3fARB');
    if not Assigned(glUniform3fARB) then Exit;
    @glUniform4fARB := SDL_GL_GetProcAddress('glUniform4fARB');
    if not Assigned(glUniform4fARB) then Exit;
    @glUniform1iARB := SDL_GL_GetProcAddress('glUniform1iARB');
    if not Assigned(glUniform1iARB) then Exit;
    @glUniform2iARB := SDL_GL_GetProcAddress('glUniform2iARB');
    if not Assigned(glUniform2iARB) then Exit;
    @glUniform3iARB := SDL_GL_GetProcAddress('glUniform3iARB');
    if not Assigned(glUniform3iARB) then Exit;
    @glUniform4iARB := SDL_GL_GetProcAddress('glUniform4iARB');
    if not Assigned(glUniform4iARB) then Exit;
    @glUniform1fvARB := SDL_GL_GetProcAddress('glUniform1fvARB');
    if not Assigned(glUniform1fvARB) then Exit;
    @glUniform2fvARB := SDL_GL_GetProcAddress('glUniform2fvARB');
    if not Assigned(glUniform2fvARB) then Exit;
    @glUniform3fvARB := SDL_GL_GetProcAddress('glUniform3fvARB');
    if not Assigned(glUniform3fvARB) then Exit;
    @glUniform4fvARB := SDL_GL_GetProcAddress('glUniform4fvARB');
    if not Assigned(glUniform4fvARB) then Exit;
    @glUniform1ivARB := SDL_GL_GetProcAddress('glUniform1ivARB');
    if not Assigned(glUniform1ivARB) then Exit;
    @glUniform2ivARB := SDL_GL_GetProcAddress('glUniform2ivARB');
    if not Assigned(glUniform2ivARB) then Exit;
    @glUniform3ivARB := SDL_GL_GetProcAddress('glUniform3ivARB');
    if not Assigned(glUniform3ivARB) then Exit;
    @glUniform4ivARB := SDL_GL_GetProcAddress('glUniform4ivARB');
    if not Assigned(glUniform4ivARB) then Exit;
    @glUniformMatrix2fvARB := SDL_GL_GetProcAddress('glUniformMatrix2fvARB');
    if not Assigned(glUniformMatrix2fvARB) then Exit;
    @glUniformMatrix3fvARB := SDL_GL_GetProcAddress('glUniformMatrix3fvARB');
    if not Assigned(glUniformMatrix3fvARB) then Exit;
    @glUniformMatrix4fvARB := SDL_GL_GetProcAddress('glUniformMatrix4fvARB');
    if not Assigned(glUniformMatrix4fvARB) then Exit;
    @glGetObjectParameterfvARB := SDL_GL_GetProcAddress('glGetObjectParameterfvARB');
    if not Assigned(glGetObjectParameterfvARB) then Exit;
    @glGetObjectParameterivARB := SDL_GL_GetProcAddress('glGetObjectParameterivARB');
    if not Assigned(glGetObjectParameterivARB) then Exit;
    @glGetInfoLogARB := SDL_GL_GetProcAddress('glGetInfoLogARB');
    if not Assigned(glGetInfoLogARB) then Exit;
    @glGetAttachedObjectsARB := SDL_GL_GetProcAddress('glGetAttachedObjectsARB');
    if not Assigned(glGetAttachedObjectsARB) then Exit;
    @glGetUniformLocationARB := SDL_GL_GetProcAddress('glGetUniformLocationARB');
    if not Assigned(glGetUniformLocationARB) then Exit;
    @glGetActiveUniformARB := SDL_GL_GetProcAddress('glGetActiveUniformARB');
    if not Assigned(glGetActiveUniformARB) then Exit;
    @glGetUniformfvARB := SDL_GL_GetProcAddress('glGetUniformfvARB');
    if not Assigned(glGetUniformfvARB) then Exit;
    @glGetUniformivARB := SDL_GL_GetProcAddress('glGetUniformivARB');
    if not Assigned(glGetUniformivARB) then Exit;
    @glGetShaderSourceARB := SDL_GL_GetProcAddress('glGetShaderSourceARB');
    if not Assigned(glGetShaderSourceARB) then Exit;
    Result := TRUE;
  end;

end;

function Load_GL_ARB_vertex_shader: Boolean;
var
  extstring : PChar;
begin

  Result := FALSE;
  extstring := glGetString( GL_EXTENSIONS );

  if glext_ExtensionSupported('GL_ARB_vertex_shader', extstring) then
  begin
    @glVertexAttrib1fARB := SDL_GL_GetProcAddress('glVertexAttrib1fARB');
    if not Assigned(glVertexAttrib1fARB) then Exit;
    @glVertexAttrib1sARB := SDL_GL_GetProcAddress('glVertexAttrib1sARB');
    if not Assigned(glVertexAttrib1sARB) then Exit;
    @glVertexAttrib1dARB := SDL_GL_GetProcAddress('glVertexAttrib1dARB');
    if not Assigned(glVertexAttrib1dARB) then Exit;
    @glVertexAttrib2fARB := SDL_GL_GetProcAddress('glVertexAttrib2fARB');
    if not Assigned(glVertexAttrib2fARB) then Exit;
    @glVertexAttrib2sARB := SDL_GL_GetProcAddress('glVertexAttrib2sARB');
    if not Assigned(glVertexAttrib2sARB) then Exit;
    @glVertexAttrib2dARB := SDL_GL_GetProcAddress('glVertexAttrib2dARB');
    if not Assigned(glVertexAttrib2dARB) then Exit;
    @glVertexAttrib3fARB := SDL_GL_GetProcAddress('glVertexAttrib3fARB');
    if not Assigned(glVertexAttrib3fARB) then Exit;
    @glVertexAttrib3sARB := SDL_GL_GetProcAddress('glVertexAttrib3sARB');
    if not Assigned(glVertexAttrib3sARB) then Exit;
    @glVertexAttrib3dARB := SDL_GL_GetProcAddress('glVertexAttrib3dARB');
    if not Assigned(glVertexAttrib3dARB) then Exit;
    @glVertexAttrib4fARB := SDL_GL_GetProcAddress('glVertexAttrib4fARB');
    if not Assigned(glVertexAttrib4fARB) then Exit;
    @glVertexAttrib4sARB := SDL_GL_GetProcAddress('glVertexAttrib4sARB');
    if not Assigned(glVertexAttrib4sARB) then Exit;
    @glVertexAttrib4dARB := SDL_GL_GetProcAddress('glVertexAttrib4dARB');
    if not Assigned(glVertexAttrib4dARB) then Exit;
    @glVertexAttrib4NubARB := SDL_GL_GetProcAddress('glVertexAttrib4NubARB');
    if not Assigned(glVertexAttrib4NubARB) then Exit;
    @glVertexAttrib1fvARB := SDL_GL_GetProcAddress('glVertexAttrib1fvARB');
    if not Assigned(glVertexAttrib1fvARB) then Exit;
    @glVertexAttrib1svARB := SDL_GL_GetProcAddress('glVertexAttrib1svARB');
    if not Assigned(glVertexAttrib1svARB) then Exit;
    @glVertexAttrib1dvARB := SDL_GL_GetProcAddress('glVertexAttrib1dvARB');
    if not Assigned(glVertexAttrib1dvARB) then Exit;
    @glVertexAttrib2fvARB := SDL_GL_GetProcAddress('glVertexAttrib2fvARB');
    if not Assigned(glVertexAttrib2fvARB) then Exit;
    @glVertexAttrib2svARB := SDL_GL_GetProcAddress('glVertexAttrib2svARB');
    if not Assigned(glVertexAttrib2svARB) then Exit;
    @glVertexAttrib2dvARB := SDL_GL_GetProcAddress('glVertexAttrib2dvARB');
    if not Assigned(glVertexAttrib2dvARB) then Exit;
    @glVertexAttrib3fvARB := SDL_GL_GetProcAddress('glVertexAttrib3fvARB');
    if not Assigned(glVertexAttrib3fvARB) then Exit;
    @glVertexAttrib3svARB := SDL_GL_GetProcAddress('glVertexAttrib3svARB');
    if not Assigned(glVertexAttrib3svARB) then Exit;
    @glVertexAttrib3dvARB := SDL_GL_GetProcAddress('glVertexAttrib3dvARB');
    if not Assigned(glVertexAttrib3dvARB) then Exit;
    @glVertexAttrib4fvARB := SDL_GL_GetProcAddress('glVertexAttrib4fvARB');
    if not Assigned(glVertexAttrib4fvARB) then Exit;
    @glVertexAttrib4svARB := SDL_GL_GetProcAddress('glVertexAttrib4svARB');
    if not Assigned(glVertexAttrib4svARB) then Exit;
    @glVertexAttrib4dvARB := SDL_GL_GetProcAddress('glVertexAttrib4dvARB');
    if not Assigned(glVertexAttrib4dvARB) then Exit;
    @glVertexAttrib4ivARB := SDL_GL_GetProcAddress('glVertexAttrib4ivARB');
    if not Assigned(glVertexAttrib4ivARB) then Exit;
    @glVertexAttrib4bvARB := SDL_GL_GetProcAddress('glVertexAttrib4bvARB');
    if not Assigned(glVertexAttrib4bvARB) then Exit;
    @glVertexAttrib4ubvARB := SDL_GL_GetProcAddress('glVertexAttrib4ubvARB');
    if not Assigned(glVertexAttrib4ubvARB) then Exit;
    @glVertexAttrib4usvARB := SDL_GL_GetProcAddress('glVertexAttrib4usvARB');
    if not Assigned(glVertexAttrib4usvARB) then Exit;
    @glVertexAttrib4uivARB := SDL_GL_GetProcAddress('glVertexAttrib4uivARB');
    if not Assigned(glVertexAttrib4uivARB) then Exit;
    @glVertexAttrib4NbvARB := SDL_GL_GetProcAddress('glVertexAttrib4NbvARB');
    if not Assigned(glVertexAttrib4NbvARB) then Exit;
    @glVertexAttrib4NsvARB := SDL_GL_GetProcAddress('glVertexAttrib4NsvARB');
    if not Assigned(glVertexAttrib4NsvARB) then Exit;
    @glVertexAttrib4NivARB := SDL_GL_GetProcAddress('glVertexAttrib4NivARB');
    if not Assigned(glVertexAttrib4NivARB) then Exit;
    @glVertexAttrib4NubvARB := SDL_GL_GetProcAddress('glVertexAttrib4NubvARB');
    if not Assigned(glVertexAttrib4NubvARB) then Exit;
    @glVertexAttrib4NusvARB := SDL_GL_GetProcAddress('glVertexAttrib4NusvARB');
    if not Assigned(glVertexAttrib4NusvARB) then Exit;
    @glVertexAttrib4NuivARB := SDL_GL_GetProcAddress('glVertexAttrib4NuivARB');
    if not Assigned(glVertexAttrib4NuivARB) then Exit;
    @glVertexAttribPointerARB := SDL_GL_GetProcAddress('glVertexAttribPointerARB');
    if not Assigned(glVertexAttribPointerARB) then Exit;
    @glEnableVertexAttribArrayARB := SDL_GL_GetProcAddress('glEnableVertexAttribArrayARB');
    if not Assigned(glEnableVertexAttribArrayARB) then Exit;
    @glDisableVertexAttribArrayARB := SDL_GL_GetProcAddress('glDisableVertexAttribArrayARB');
    if not Assigned(glDisableVertexAttribArrayARB) then Exit;
    @glBindAttribLocationARB := SDL_GL_GetProcAddress('glBindAttribLocationARB');
    if not Assigned(glBindAttribLocationARB) then Exit;
    @glGetActiveAttribARB := SDL_GL_GetProcAddress('glGetActiveAttribARB');
    if not Assigned(glGetActiveAttribARB) then Exit;
    @glGetAttribLocationARB := SDL_GL_GetProcAddress('glGetAttribLocationARB');
    if not Assigned(glGetAttribLocationARB) then Exit;
    @glGetVertexAttribdvARB := SDL_GL_GetProcAddress('glGetVertexAttribdvARB');
    if not Assigned(glGetVertexAttribdvARB) then Exit;
    @glGetVertexAttribfvARB := SDL_GL_GetProcAddress('glGetVertexAttribfvARB');
    if not Assigned(glGetVertexAttribfvARB) then Exit;
    @glGetVertexAttribivARB := SDL_GL_GetProcAddress('glGetVertexAttribivARB');
    if not Assigned(glGetVertexAttribivARB) then Exit;
    @glGetVertexAttribPointervARB := SDL_GL_GetProcAddress('glGetVertexAttribPointervARB');
    if not Assigned(glGetVertexAttribPointervARB) then Exit;
    Result := TRUE;
  end;

end;

function Load_GL_ARB_fragment_shader: Boolean;
var
  extstring : PChar;
begin

  Result := FALSE;
  extstring := glGetString( GL_EXTENSIONS );

  if glext_ExtensionSupported('GL_ARB_fragment_shader', extstring) then
  begin
    Result := TRUE;
  end;

end;

function Load_GL_ARB_shading_language_100: Boolean;
var
  extstring : PChar;
begin

  Result := FALSE;
  extstring := glGetString( GL_EXTENSIONS );

  if glext_ExtensionSupported('GL_ARB_shading_language_100', extstring) then
  begin
    Result := TRUE;
  end;

end;

function Load_GL_ARB_texture_non_power_of_two: Boolean;
var
  extstring : PChar;
begin

  Result := FALSE;
  extstring := glGetString( GL_EXTENSIONS );

  if glext_ExtensionSupported('GL_ARB_texture_non_power_of_two', extstring) then
  begin
    Result := TRUE;
  end;

end;

function Load_GL_ARB_point_sprite: Boolean;
var
  extstring : PChar;
begin

  Result := FALSE;
  extstring := glGetString( GL_EXTENSIONS );

  if glext_ExtensionSupported('GL_ARB_point_sprite', extstring) then
  begin
    Result := TRUE;
  end;

end;

function Load_GL_EXT_depth_bounds_test: Boolean;
var
  extstring : PChar;
begin

  Result := FALSE;
  extstring := glGetString( GL_EXTENSIONS );

  if glext_ExtensionSupported('GL_EXT_depth_bounds_test', extstring) then
  begin
    @glDepthBoundsEXT := SDL_GL_GetProcAddress('glDepthBoundsEXT');
    if not Assigned(glDepthBoundsEXT) then Exit;
    Result := TRUE;
  end;

end;

function Load_GL_EXT_secondary_color: Boolean;
var
  extstring : PChar;
begin

  Result := FALSE;
  extstring := glGetString( GL_EXTENSIONS );

  if glext_ExtensionSupported('GL_EXT_secondary_color', extstring) then
  begin
    @glSecondaryColor3bEXT := SDL_GL_GetProcAddress('glSecondaryColor3bEXT');
    if not Assigned(glSecondaryColor3bEXT) then Exit;
    @glSecondaryColor3sEXT := SDL_GL_GetProcAddress('glSecondaryColor3sEXT');
    if not Assigned(glSecondaryColor3sEXT) then Exit;
    @glSecondaryColor3iEXT := SDL_GL_GetProcAddress('glSecondaryColor3iEXT');
    if not Assigned(glSecondaryColor3iEXT) then Exit;
    @glSecondaryColor3fEXT := SDL_GL_GetProcAddress('glSecondaryColor3fEXT');
    if not Assigned(glSecondaryColor3fEXT) then Exit;
    @glSecondaryColor3dEXT := SDL_GL_GetProcAddress('glSecondaryColor3dEXT');
    if not Assigned(glSecondaryColor3dEXT) then Exit;
    @glSecondaryColor3ubEXT := SDL_GL_GetProcAddress('glSecondaryColor3ubEXT');
    if not Assigned(glSecondaryColor3ubEXT) then Exit;
    @glSecondaryColor3usEXT := SDL_GL_GetProcAddress('glSecondaryColor3usEXT');
    if not Assigned(glSecondaryColor3usEXT) then Exit;
    @glSecondaryColor3uiEXT := SDL_GL_GetProcAddress('glSecondaryColor3uiEXT');
    if not Assigned(glSecondaryColor3uiEXT) then Exit;
    @glSecondaryColor3bvEXT := SDL_GL_GetProcAddress('glSecondaryColor3bvEXT');
    if not Assigned(glSecondaryColor3bvEXT) then Exit;
    @glSecondaryColor3svEXT := SDL_GL_GetProcAddress('glSecondaryColor3svEXT');
    if not Assigned(glSecondaryColor3svEXT) then Exit;
    @glSecondaryColor3ivEXT := SDL_GL_GetProcAddress('glSecondaryColor3ivEXT');
    if not Assigned(glSecondaryColor3ivEXT) then Exit;
    @glSecondaryColor3fvEXT := SDL_GL_GetProcAddress('glSecondaryColor3fvEXT');
    if not Assigned(glSecondaryColor3fvEXT) then Exit;
    @glSecondaryColor3dvEXT := SDL_GL_GetProcAddress('glSecondaryColor3dvEXT');
    if not Assigned(glSecondaryColor3dvEXT) then Exit;
    @glSecondaryColor3ubvEXT := SDL_GL_GetProcAddress('glSecondaryColor3ubvEXT');
    if not Assigned(glSecondaryColor3ubvEXT) then Exit;
    @glSecondaryColor3usvEXT := SDL_GL_GetProcAddress('glSecondaryColor3usvEXT');
    if not Assigned(glSecondaryColor3usvEXT) then Exit;
    @glSecondaryColor3uivEXT := SDL_GL_GetProcAddress('glSecondaryColor3uivEXT');
    if not Assigned(glSecondaryColor3uivEXT) then Exit;
    @glSecondaryColorPointerEXT := SDL_GL_GetProcAddress('glSecondaryColorPointerEXT');
    if not Assigned(glSecondaryColorPointerEXT) then Exit;
    Result := TRUE;
  end;

end;

function Load_GL_EXT_texture_mirror_clamp: Boolean;
var
  extstring : PChar;
begin

  Result := FALSE;
  extstring := glGetString( GL_EXTENSIONS );

  if glext_ExtensionSupported('GL_EXT_texture_mirror_clamp', extstring) then
  begin
    Result := TRUE;
  end;

end;

function Load_GL_EXT_blend_equation_separate: Boolean;
var
  extstring : PChar;
begin

  Result := FALSE;
  extstring := glGetString( GL_EXTENSIONS );

  if glext_ExtensionSupported('GL_EXT_blend_equation_separate', extstring) then
  begin
    @glBlendEquationSeparateEXT := SDL_GL_GetProcAddress('glBlendEquationSeparateEXT');
    if not Assigned(glBlendEquationSeparateEXT) then Exit;
    Result := TRUE;
  end;

end;

function Load_GL_MESA_pack_invert: Boolean;
var
  extstring : PChar;
begin

  Result := FALSE;
  extstring := glGetString( GL_EXTENSIONS );

  if glext_ExtensionSupported('GL_MESA_pack_invert', extstring) then
  begin
    Result := TRUE;
  end;

end;

function Load_GL_MESA_ycbcr_texture: Boolean;
var
  extstring : PChar;
begin

  Result := FALSE;
  extstring := glGetString( GL_EXTENSIONS );

  if glext_ExtensionSupported('GL_MESA_ycbcr_texture', extstring) then
  begin
    Result := TRUE;
  end;

end;

function Load_GL_ARB_fragment_program_shadow: Boolean;
var
  extstring : PChar;
begin

  Result := FALSE;
  extstring := glGetString( GL_EXTENSIONS );

  if glext_ExtensionSupported('GL_ARB_fragment_program_shadow', extstring) then
  begin
    Result := TRUE;
  end;

end;

function Load_GL_EXT_fog_coord: Boolean;
var
  extstring : PChar;
begin

  Result := FALSE;
  extstring := glGetString( GL_EXTENSIONS );

  if glext_ExtensionSupported('GL_EXT_fog_coord', extstring) then
  begin
    @glFogCoordfEXT := SDL_GL_GetProcAddress('glFogCoordfEXT');
    if not Assigned(glFogCoordfEXT) then Exit;
    @glFogCoorddEXT := SDL_GL_GetProcAddress('glFogCoorddEXT');
    if not Assigned(glFogCoorddEXT) then Exit;
    @glFogCoordfvEXT := SDL_GL_GetProcAddress('glFogCoordfvEXT');
    if not Assigned(glFogCoordfvEXT) then Exit;
    @glFogCoorddvEXT := SDL_GL_GetProcAddress('glFogCoorddvEXT');
    if not Assigned(glFogCoorddvEXT) then Exit;
    @glFogCoordPointerEXT := SDL_GL_GetProcAddress('glFogCoordPointerEXT');
    if not Assigned(glFogCoordPointerEXT) then Exit;
    Result := TRUE;
  end;

end;

function Load_GL_NV_fragment_program_option: Boolean;
var
  extstring : PChar;
begin

  Result := FALSE;
  extstring := glGetString( GL_EXTENSIONS );

  if glext_ExtensionSupported('GL_NV_fragment_program_option', extstring) then
  begin
    Result := TRUE;
  end;

end;

function Load_GL_EXT_pixel_buffer_object: Boolean;
var
  extstring : PChar;
begin

  Result := FALSE;
  extstring := glGetString( GL_EXTENSIONS );

  if glext_ExtensionSupported('GL_EXT_pixel_buffer_object', extstring) then
  begin
    Result := TRUE;
  end;

end;

function Load_GL_NV_fragment_program2: Boolean;
var
  extstring : PChar;
begin

  Result := FALSE;
  extstring := glGetString( GL_EXTENSIONS );

  if glext_ExtensionSupported('GL_NV_fragment_program2', extstring) then
  begin
    Result := TRUE;
  end;

end;

function Load_GL_NV_vertex_program2_option: Boolean;
var
  extstring : PChar;
begin

  Result := FALSE;
  extstring := glGetString( GL_EXTENSIONS );

  if glext_ExtensionSupported('GL_NV_vertex_program2_option', extstring) then
  begin
    Result := TRUE;
  end;

end;

function Load_GL_NV_vertex_program3: Boolean;
var
  extstring : PChar;
begin

  Result := FALSE;
  extstring := glGetString( GL_EXTENSIONS );

  if glext_ExtensionSupported('GL_NV_vertex_program3', extstring) then
  begin
    Result := TRUE;
  end;

end;

function Load_GL_ARB_draw_buffers: Boolean;
var
  extstring: PChar;
begin

  Result := FALSE;
  extstring := glGetString(GL_EXTENSIONS);

  if glext_ExtensionSupported('GL_ARB_draw_buffers', extstring) then
  begin
    glDrawBuffersARB := SDL_GL_GetProcAddress('glDrawBuffersARB');
    if not Assigned(glDrawBuffersARB) then Exit;
    Result := TRUE;
  end;

end;

function Load_GL_ARB_texture_rectangle: Boolean;
var
  extstring: PChar;
begin

  Result := FALSE;
  extstring := glGetString(GL_EXTENSIONS);

  if glext_ExtensionSupported('GL_ARB_texture_rectangle', extstring) then
  begin
    Result := TRUE;
  end;

end;

function Load_GL_ARB_color_buffer_float: Boolean;
var
  extstring: PChar;
begin

  Result := FALSE;
  extstring := glGetString(GL_EXTENSIONS);

  if glext_ExtensionSupported('GL_ARB_color_buffer_float', extstring) then
  begin
    glClampColorARB := SDL_GL_GetProcAddress('glClampColorARB');
    if not Assigned(glClampColorARB) then Exit;
    Result := TRUE;
  end;

end;

function Load_GL_ARB_half_float_pixel: Boolean;
var
  extstring: PChar;
begin

  Result := FALSE;
  extstring := glGetString(GL_EXTENSIONS);

  if glext_ExtensionSupported('GL_ARB_half_float_pixel', extstring) then
  begin
    Result := TRUE;
  end;

end;

function Load_GL_ARB_texture_float: Boolean;
var
  extstring: PChar;
begin

  Result := FALSE;
  extstring := glGetString(GL_EXTENSIONS);

  if glext_ExtensionSupported('GL_ARB_texture_float', extstring) then
  begin
    Result := TRUE;
  end;

end;

function Load_GL_EXT_texture_compression_dxt1: Boolean;
var
  extstring: PChar;
begin

  Result := FALSE;
  extstring := glGetString(GL_EXTENSIONS);

  if glext_ExtensionSupported('GL_EXT_texture_compression_dxt1', extstring) then
  begin
    Result := TRUE;
  end;

end;

function Load_GL_ARB_pixel_buffer_object: Boolean;
var
  extstring: PChar;
begin

  Result := FALSE;
  extstring := glGetString(GL_EXTENSIONS);

  if glext_ExtensionSupported('GL_ARB_pixel_buffer_object', extstring) then
  begin
    Result := TRUE;
  end;

end;

function Load_GL_EXT_framebuffer_object: Boolean;
var
  extstring: PChar;
begin

  Result := FALSE;
  extstring := glGetString(GL_EXTENSIONS);

  if glext_ExtensionSupported('GL_EXT_framebuffer_object', extstring) then
  begin
    glIsRenderbufferEXT := SDL_GL_GetProcAddress('glIsRenderbufferEXT');
    if not Assigned(glIsRenderbufferEXT) then Exit;
    glBindRenderbufferEXT := SDL_GL_GetProcAddress('glBindRenderbufferEXT');
    if not Assigned(glBindRenderbufferEXT) then Exit;
    glDeleteRenderbuffersEXT := SDL_GL_GetProcAddress('glDeleteRenderbuffersEXT');
    if not Assigned(glDeleteRenderbuffersEXT) then Exit;
    glGenRenderbuffersEXT := SDL_GL_GetProcAddress('glGenRenderbuffersEXT');
    if not Assigned(glGenRenderbuffersEXT) then Exit;
    glRenderbufferStorageEXT := SDL_GL_GetProcAddress('glRenderbufferStorageEXT');
    if not Assigned(glRenderbufferStorageEXT) then Exit;
    glGetRenderbufferParameterivEXT := SDL_GL_GetProcAddress('glGetRenderbufferParameterivEXT');
    if not Assigned(glGetRenderbufferParameterivEXT) then Exit;
    glIsFramebufferEXT := SDL_GL_GetProcAddress('glIsFramebufferEXT');
    if not Assigned(glIsFramebufferEXT) then Exit;
    glBindFramebufferEXT := SDL_GL_GetProcAddress('glBindFramebufferEXT');
    if not Assigned(glBindFramebufferEXT) then Exit;
    glDeleteFramebuffersEXT := SDL_GL_GetProcAddress('glDeleteFramebuffersEXT');
    if not Assigned(glDeleteFramebuffersEXT) then Exit;
    glGenFramebuffersEXT := SDL_GL_GetProcAddress('glGenFramebuffersEXT');
    if not Assigned(glGenFramebuffersEXT) then Exit;
    glCheckFramebufferStatusEXT := SDL_GL_GetProcAddress('glCheckFramebufferStatusEXT');
    if not Assigned(glCheckFramebufferStatusEXT) then Exit;
    glFramebufferTexture1DEXT := SDL_GL_GetProcAddress('glFramebufferTexture1DEXT');
    if not Assigned(glFramebufferTexture1DEXT) then Exit;
    glFramebufferTexture2DEXT := SDL_GL_GetProcAddress('glFramebufferTexture2DEXT');
    if not Assigned(glFramebufferTexture2DEXT) then Exit;
    glFramebufferTexture3DEXT := SDL_GL_GetProcAddress('glFramebufferTexture3DEXT');
    if not Assigned(glFramebufferTexture3DEXT) then Exit;
    glFramebufferRenderbufferEXT := SDL_GL_GetProcAddress('glFramebufferRenderbufferEXT');
    if not Assigned(glFramebufferRenderbufferEXT) then Exit;
    glGetFramebufferAttachmentParameterivEXT := SDL_GL_GetProcAddress('glGetFramebufferAttachmentParameterivEXT');
    if not Assigned(glGetFramebufferAttachmentParameterivEXT) then Exit;
    glGenerateMipmapEXT := SDL_GL_GetProcAddress('glGenerateMipmapEXT');
    if not Assigned(glGenerateMipmapEXT) then Exit;
    Result := TRUE;
  end;

end;

function Load_GL_version_1_4: Boolean;
var
  extstring: String;
begin

  Result := FALSE;
  extstring := String(PChar(glGetString(GL_EXTENSIONS)));

    glBlendFuncSeparate := SDL_GL_GetProcAddress('glBlendFuncSeparate');
    if not Assigned(glBlendFuncSeparate) then Exit;
    glFogCoordf := SDL_GL_GetProcAddress('glFogCoordf');
    if not Assigned(glFogCoordf) then Exit;
    glFogCoordfv := SDL_GL_GetProcAddress('glFogCoordfv');
    if not Assigned(glFogCoordfv) then Exit;
    glFogCoordd := SDL_GL_GetProcAddress('glFogCoordd');
    if not Assigned(glFogCoordd) then Exit;
    glFogCoorddv := SDL_GL_GetProcAddress('glFogCoorddv');
    if not Assigned(glFogCoorddv) then Exit;
    glFogCoordPointer := SDL_GL_GetProcAddress('glFogCoordPointer');
    if not Assigned(glFogCoordPointer) then Exit;
    glMultiDrawArrays := SDL_GL_GetProcAddress('glMultiDrawArrays');
    if not Assigned(glMultiDrawArrays) then Exit;
    glMultiDrawElements := SDL_GL_GetProcAddress('glMultiDrawElements');
    if not Assigned(glMultiDrawElements) then Exit;
    glPointParameterf := SDL_GL_GetProcAddress('glPointParameterf');
    if not Assigned(glPointParameterf) then Exit;
    glPointParameterfv := SDL_GL_GetProcAddress('glPointParameterfv');
    if not Assigned(glPointParameterfv) then Exit;
    glPointParameteri := SDL_GL_GetProcAddress('glPointParameteri');
    if not Assigned(glPointParameteri) then Exit;
    glPointParameteriv := SDL_GL_GetProcAddress('glPointParameteriv');
    if not Assigned(glPointParameteriv) then Exit;
    glSecondaryColor3b := SDL_GL_GetProcAddress('glSecondaryColor3b');
    if not Assigned(glSecondaryColor3b) then Exit;
    glSecondaryColor3bv := SDL_GL_GetProcAddress('glSecondaryColor3bv');
    if not Assigned(glSecondaryColor3bv) then Exit;
    glSecondaryColor3d := SDL_GL_GetProcAddress('glSecondaryColor3d');
    if not Assigned(glSecondaryColor3d) then Exit;
    glSecondaryColor3dv := SDL_GL_GetProcAddress('glSecondaryColor3dv');
    if not Assigned(glSecondaryColor3dv) then Exit;
    glSecondaryColor3f := SDL_GL_GetProcAddress('glSecondaryColor3f');
    if not Assigned(glSecondaryColor3f) then Exit;
    glSecondaryColor3fv := SDL_GL_GetProcAddress('glSecondaryColor3fv');
    if not Assigned(glSecondaryColor3fv) then Exit;
    glSecondaryColor3i := SDL_GL_GetProcAddress('glSecondaryColor3i');
    if not Assigned(glSecondaryColor3i) then Exit;
    glSecondaryColor3iv := SDL_GL_GetProcAddress('glSecondaryColor3iv');
    if not Assigned(glSecondaryColor3iv) then Exit;
    glSecondaryColor3s := SDL_GL_GetProcAddress('glSecondaryColor3s');
    if not Assigned(glSecondaryColor3s) then Exit;
    glSecondaryColor3sv := SDL_GL_GetProcAddress('glSecondaryColor3sv');
    if not Assigned(glSecondaryColor3sv) then Exit;
    glSecondaryColor3ub := SDL_GL_GetProcAddress('glSecondaryColor3ub');
    if not Assigned(glSecondaryColor3ub) then Exit;
    glSecondaryColor3ubv := SDL_GL_GetProcAddress('glSecondaryColor3ubv');
    if not Assigned(glSecondaryColor3ubv) then Exit;
    glSecondaryColor3ui := SDL_GL_GetProcAddress('glSecondaryColor3ui');
    if not Assigned(glSecondaryColor3ui) then Exit;
    glSecondaryColor3uiv := SDL_GL_GetProcAddress('glSecondaryColor3uiv');
    if not Assigned(glSecondaryColor3uiv) then Exit;
    glSecondaryColor3us := SDL_GL_GetProcAddress('glSecondaryColor3us');
    if not Assigned(glSecondaryColor3us) then Exit;
    glSecondaryColor3usv := SDL_GL_GetProcAddress('glSecondaryColor3usv');
    if not Assigned(glSecondaryColor3usv) then Exit;
    glSecondaryColorPointer := SDL_GL_GetProcAddress('glSecondaryColorPointer');
    if not Assigned(glSecondaryColorPointer) then Exit;
    glWindowPos2d := SDL_GL_GetProcAddress('glWindowPos2d');
    if not Assigned(glWindowPos2d) then Exit;
    glWindowPos2dv := SDL_GL_GetProcAddress('glWindowPos2dv');
    if not Assigned(glWindowPos2dv) then Exit;
    glWindowPos2f := SDL_GL_GetProcAddress('glWindowPos2f');
    if not Assigned(glWindowPos2f) then Exit;
    glWindowPos2fv := SDL_GL_GetProcAddress('glWindowPos2fv');
    if not Assigned(glWindowPos2fv) then Exit;
    glWindowPos2i := SDL_GL_GetProcAddress('glWindowPos2i');
    if not Assigned(glWindowPos2i) then Exit;
    glWindowPos2iv := SDL_GL_GetProcAddress('glWindowPos2iv');
    if not Assigned(glWindowPos2iv) then Exit;
    glWindowPos2s := SDL_GL_GetProcAddress('glWindowPos2s');
    if not Assigned(glWindowPos2s) then Exit;
    glWindowPos2sv := SDL_GL_GetProcAddress('glWindowPos2sv');
    if not Assigned(glWindowPos2sv) then Exit;
    glWindowPos3d := SDL_GL_GetProcAddress('glWindowPos3d');
    if not Assigned(glWindowPos3d) then Exit;
    glWindowPos3dv := SDL_GL_GetProcAddress('glWindowPos3dv');
    if not Assigned(glWindowPos3dv) then Exit;
    glWindowPos3f := SDL_GL_GetProcAddress('glWindowPos3f');
    if not Assigned(glWindowPos3f) then Exit;
    glWindowPos3fv := SDL_GL_GetProcAddress('glWindowPos3fv');
    if not Assigned(glWindowPos3fv) then Exit;
    glWindowPos3i := SDL_GL_GetProcAddress('glWindowPos3i');
    if not Assigned(glWindowPos3i) then Exit;
    glWindowPos3iv := SDL_GL_GetProcAddress('glWindowPos3iv');
    if not Assigned(glWindowPos3iv) then Exit;
    glWindowPos3s := SDL_GL_GetProcAddress('glWindowPos3s');
    if not Assigned(glWindowPos3s) then Exit;
    glWindowPos3sv := SDL_GL_GetProcAddress('glWindowPos3sv');
    if not Assigned(glWindowPos3sv) then Exit;
    Result := TRUE;

end;

function Load_GL_version_1_5: Boolean;
var
  extstring: String;
begin

  Result := FALSE;
  extstring := String(PChar(glGetString(GL_EXTENSIONS)));

    glGenQueries := SDL_GL_GetProcAddress('glGenQueries');
    if not Assigned(glGenQueries) then Exit;
    glDeleteQueries := SDL_GL_GetProcAddress('glDeleteQueries');
    if not Assigned(glDeleteQueries) then Exit;
    glIsQuery := SDL_GL_GetProcAddress('glIsQuery');
    if not Assigned(glIsQuery) then Exit;
    glBeginQuery := SDL_GL_GetProcAddress('glBeginQuery');
    if not Assigned(glBeginQuery) then Exit;
    glEndQuery := SDL_GL_GetProcAddress('glEndQuery');
    if not Assigned(glEndQuery) then Exit;
    glGetQueryiv := SDL_GL_GetProcAddress('glGetQueryiv');
    if not Assigned(glGetQueryiv) then Exit;
    glGetQueryObjectiv := SDL_GL_GetProcAddress('glGetQueryObjectiv');
    if not Assigned(glGetQueryObjectiv) then Exit;
    glGetQueryObjectuiv := SDL_GL_GetProcAddress('glGetQueryObjectuiv');
    if not Assigned(glGetQueryObjectuiv) then Exit;
    glBindBuffer := SDL_GL_GetProcAddress('glBindBuffer');
    if not Assigned(glBindBuffer) then Exit;
    glDeleteBuffers := SDL_GL_GetProcAddress('glDeleteBuffers');
    if not Assigned(glDeleteBuffers) then Exit;
    glGenBuffers := SDL_GL_GetProcAddress('glGenBuffers');
    if not Assigned(glGenBuffers) then Exit;
    glIsBuffer := SDL_GL_GetProcAddress('glIsBuffer');
    if not Assigned(glIsBuffer) then Exit;
    glBufferData := SDL_GL_GetProcAddress('glBufferData');
    if not Assigned(glBufferData) then Exit;
    glBufferSubData := SDL_GL_GetProcAddress('glBufferSubData');
    if not Assigned(glBufferSubData) then Exit;
    glGetBufferSubData := SDL_GL_GetProcAddress('glGetBufferSubData');
    if not Assigned(glGetBufferSubData) then Exit;
    glMapBuffer := SDL_GL_GetProcAddress('glMapBuffer');
    if not Assigned(glMapBuffer) then Exit;
    glUnmapBuffer := SDL_GL_GetProcAddress('glUnmapBuffer');
    if not Assigned(glUnmapBuffer) then Exit;
    glGetBufferParameteriv := SDL_GL_GetProcAddress('glGetBufferParameteriv');
    if not Assigned(glGetBufferParameteriv) then Exit;
    glGetBufferPointerv := SDL_GL_GetProcAddress('glGetBufferPointerv');
    if not Assigned(glGetBufferPointerv) then Exit;
    Result := TRUE;

end;

function Load_GL_version_2_0: Boolean;
var
  extstring: String;
begin

  Result := FALSE;
  extstring := String(PChar(glGetString(GL_EXTENSIONS)));

    glBlendEquationSeparate := SDL_GL_GetProcAddress('glBlendEquationSeparate');
    if not Assigned(glBlendEquationSeparate) then Exit;
    glDrawBuffers := SDL_GL_GetProcAddress('glDrawBuffers');
    if not Assigned(glDrawBuffers) then Exit;
    glStencilOpSeparate := SDL_GL_GetProcAddress('glStencilOpSeparate');
    if not Assigned(glStencilOpSeparate) then Exit;
    glStencilFuncSeparate := SDL_GL_GetProcAddress('glStencilFuncSeparate');
    if not Assigned(glStencilFuncSeparate) then Exit;
    glStencilMaskSeparate := SDL_GL_GetProcAddress('glStencilMaskSeparate');
    if not Assigned(glStencilMaskSeparate) then Exit;
    glAttachShader := SDL_GL_GetProcAddress('glAttachShader');
    if not Assigned(glAttachShader) then Exit;
    glBindAttribLocation := SDL_GL_GetProcAddress('glBindAttribLocation');
    if not Assigned(glBindAttribLocation) then Exit;
    glCompileShader := SDL_GL_GetProcAddress('glCompileShader');
    if not Assigned(glCompileShader) then Exit;
    glCreateProgram := SDL_GL_GetProcAddress('glCreateProgram');
    if not Assigned(glCreateProgram) then Exit;
    glCreateShader := SDL_GL_GetProcAddress('glCreateShader');
    if not Assigned(glCreateShader) then Exit;
    glDeleteProgram := SDL_GL_GetProcAddress('glDeleteProgram');
    if not Assigned(glDeleteProgram) then Exit;
    glDeleteShader := SDL_GL_GetProcAddress('glDeleteShader');
    if not Assigned(glDeleteShader) then Exit;
    glDetachShader := SDL_GL_GetProcAddress('glDetachShader');
    if not Assigned(glDetachShader) then Exit;
    glDisableVertexAttribArray := SDL_GL_GetProcAddress('glDisableVertexAttribArray');
    if not Assigned(glDisableVertexAttribArray) then Exit;
    glEnableVertexAttribArray := SDL_GL_GetProcAddress('glEnableVertexAttribArray');
    if not Assigned(glEnableVertexAttribArray) then Exit;
    glGetActiveAttrib := SDL_GL_GetProcAddress('glGetActiveAttrib');
    if not Assigned(glGetActiveAttrib) then Exit;
    glGetActiveUniform := SDL_GL_GetProcAddress('glGetActiveUniform');
    if not Assigned(glGetActiveUniform) then Exit;
    glGetAttachedShaders := SDL_GL_GetProcAddress('glGetAttachedShaders');
    if not Assigned(glGetAttachedShaders) then Exit;
    glGetAttribLocation := SDL_GL_GetProcAddress('glGetAttribLocation');
    if not Assigned(glGetAttribLocation) then Exit;
    glGetProgramiv := SDL_GL_GetProcAddress('glGetProgramiv');
    if not Assigned(glGetProgramiv) then Exit;
    glGetProgramInfoLog := SDL_GL_GetProcAddress('glGetProgramInfoLog');
    if not Assigned(glGetProgramInfoLog) then Exit;
    glGetShaderiv := SDL_GL_GetProcAddress('glGetShaderiv');
    if not Assigned(glGetShaderiv) then Exit;
    glGetShaderInfoLog := SDL_GL_GetProcAddress('glGetShaderInfoLog');
    if not Assigned(glGetShaderInfoLog) then Exit;
    glGetShaderSource := SDL_GL_GetProcAddress('glGetShaderSource');
    if not Assigned(glGetShaderSource) then Exit;
    glGetUniformLocation := SDL_GL_GetProcAddress('glGetUniformLocation');
    if not Assigned(glGetUniformLocation) then Exit;
    glGetUniformfv := SDL_GL_GetProcAddress('glGetUniformfv');
    if not Assigned(glGetUniformfv) then Exit;
    glGetUniformiv := SDL_GL_GetProcAddress('glGetUniformiv');
    if not Assigned(glGetUniformiv) then Exit;
    glGetVertexAttribdv := SDL_GL_GetProcAddress('glGetVertexAttribdv');
    if not Assigned(glGetVertexAttribdv) then Exit;
    glGetVertexAttribfv := SDL_GL_GetProcAddress('glGetVertexAttribfv');
    if not Assigned(glGetVertexAttribfv) then Exit;
    glGetVertexAttribiv := SDL_GL_GetProcAddress('glGetVertexAttribiv');
    if not Assigned(glGetVertexAttribiv) then Exit;
    glGetVertexAttribPointerv := SDL_GL_GetProcAddress('glGetVertexAttribPointerv');
    if not Assigned(glGetVertexAttribPointerv) then Exit;
    glIsProgram := SDL_GL_GetProcAddress('glIsProgram');
    if not Assigned(glIsProgram) then Exit;
    glIsShader := SDL_GL_GetProcAddress('glIsShader');
    if not Assigned(glIsShader) then Exit;
    glLinkProgram := SDL_GL_GetProcAddress('glLinkProgram');
    if not Assigned(glLinkProgram) then Exit;
    glShaderSource := SDL_GL_GetProcAddress('glShaderSource');
    if not Assigned(glShaderSource) then Exit;
    glUseProgram := SDL_GL_GetProcAddress('glUseProgram');
    if not Assigned(glUseProgram) then Exit;
    glUniform1f := SDL_GL_GetProcAddress('glUniform1f');
    if not Assigned(glUniform1f) then Exit;
    glUniform2f := SDL_GL_GetProcAddress('glUniform2f');
    if not Assigned(glUniform2f) then Exit;
    glUniform3f := SDL_GL_GetProcAddress('glUniform3f');
    if not Assigned(glUniform3f) then Exit;
    glUniform4f := SDL_GL_GetProcAddress('glUniform4f');
    if not Assigned(glUniform4f) then Exit;
    glUniform1i := SDL_GL_GetProcAddress('glUniform1i');
    if not Assigned(glUniform1i) then Exit;
    glUniform2i := SDL_GL_GetProcAddress('glUniform2i');
    if not Assigned(glUniform2i) then Exit;
    glUniform3i := SDL_GL_GetProcAddress('glUniform3i');
    if not Assigned(glUniform3i) then Exit;
    glUniform4i := SDL_GL_GetProcAddress('glUniform4i');
    if not Assigned(glUniform4i) then Exit;
    glUniform1fv := SDL_GL_GetProcAddress('glUniform1fv');
    if not Assigned(glUniform1fv) then Exit;
    glUniform2fv := SDL_GL_GetProcAddress('glUniform2fv');
    if not Assigned(glUniform2fv) then Exit;
    glUniform3fv := SDL_GL_GetProcAddress('glUniform3fv');
    if not Assigned(glUniform3fv) then Exit;
    glUniform4fv := SDL_GL_GetProcAddress('glUniform4fv');
    if not Assigned(glUniform4fv) then Exit;
    glUniform1iv := SDL_GL_GetProcAddress('glUniform1iv');
    if not Assigned(glUniform1iv) then Exit;
    glUniform2iv := SDL_GL_GetProcAddress('glUniform2iv');
    if not Assigned(glUniform2iv) then Exit;
    glUniform3iv := SDL_GL_GetProcAddress('glUniform3iv');
    if not Assigned(glUniform3iv) then Exit;
    glUniform4iv := SDL_GL_GetProcAddress('glUniform4iv');
    if not Assigned(glUniform4iv) then Exit;
    glUniformMatrix2fv := SDL_GL_GetProcAddress('glUniformMatrix2fv');
    if not Assigned(glUniformMatrix2fv) then Exit;
    glUniformMatrix3fv := SDL_GL_GetProcAddress('glUniformMatrix3fv');
    if not Assigned(glUniformMatrix3fv) then Exit;
    glUniformMatrix4fv := SDL_GL_GetProcAddress('glUniformMatrix4fv');
    if not Assigned(glUniformMatrix4fv) then Exit;
    glValidateProgram := SDL_GL_GetProcAddress('glValidateProgram');
    if not Assigned(glValidateProgram) then Exit;
    glVertexAttrib1d := SDL_GL_GetProcAddress('glVertexAttrib1d');
    if not Assigned(glVertexAttrib1d) then Exit;
    glVertexAttrib1dv := SDL_GL_GetProcAddress('glVertexAttrib1dv');
    if not Assigned(glVertexAttrib1dv) then Exit;
    glVertexAttrib1f := SDL_GL_GetProcAddress('glVertexAttrib1f');
    if not Assigned(glVertexAttrib1f) then Exit;
    glVertexAttrib1fv := SDL_GL_GetProcAddress('glVertexAttrib1fv');
    if not Assigned(glVertexAttrib1fv) then Exit;
    glVertexAttrib1s := SDL_GL_GetProcAddress('glVertexAttrib1s');
    if not Assigned(glVertexAttrib1s) then Exit;
    glVertexAttrib1sv := SDL_GL_GetProcAddress('glVertexAttrib1sv');
    if not Assigned(glVertexAttrib1sv) then Exit;
    glVertexAttrib2d := SDL_GL_GetProcAddress('glVertexAttrib2d');
    if not Assigned(glVertexAttrib2d) then Exit;
    glVertexAttrib2dv := SDL_GL_GetProcAddress('glVertexAttrib2dv');
    if not Assigned(glVertexAttrib2dv) then Exit;
    glVertexAttrib2f := SDL_GL_GetProcAddress('glVertexAttrib2f');
    if not Assigned(glVertexAttrib2f) then Exit;
    glVertexAttrib2fv := SDL_GL_GetProcAddress('glVertexAttrib2fv');
    if not Assigned(glVertexAttrib2fv) then Exit;
    glVertexAttrib2s := SDL_GL_GetProcAddress('glVertexAttrib2s');
    if not Assigned(glVertexAttrib2s) then Exit;
    glVertexAttrib2sv := SDL_GL_GetProcAddress('glVertexAttrib2sv');
    if not Assigned(glVertexAttrib2sv) then Exit;
    glVertexAttrib3d := SDL_GL_GetProcAddress('glVertexAttrib3d');
    if not Assigned(glVertexAttrib3d) then Exit;
    glVertexAttrib3dv := SDL_GL_GetProcAddress('glVertexAttrib3dv');
    if not Assigned(glVertexAttrib3dv) then Exit;
    glVertexAttrib3f := SDL_GL_GetProcAddress('glVertexAttrib3f');
    if not Assigned(glVertexAttrib3f) then Exit;
    glVertexAttrib3fv := SDL_GL_GetProcAddress('glVertexAttrib3fv');
    if not Assigned(glVertexAttrib3fv) then Exit;
    glVertexAttrib3s := SDL_GL_GetProcAddress('glVertexAttrib3s');
    if not Assigned(glVertexAttrib3s) then Exit;
    glVertexAttrib3sv := SDL_GL_GetProcAddress('glVertexAttrib3sv');
    if not Assigned(glVertexAttrib3sv) then Exit;
    glVertexAttrib4Nbv := SDL_GL_GetProcAddress('glVertexAttrib4Nbv');
    if not Assigned(glVertexAttrib4Nbv) then Exit;
    glVertexAttrib4Niv := SDL_GL_GetProcAddress('glVertexAttrib4Niv');
    if not Assigned(glVertexAttrib4Niv) then Exit;
    glVertexAttrib4Nsv := SDL_GL_GetProcAddress('glVertexAttrib4Nsv');
    if not Assigned(glVertexAttrib4Nsv) then Exit;
    glVertexAttrib4Nub := SDL_GL_GetProcAddress('glVertexAttrib4Nub');
    if not Assigned(glVertexAttrib4Nub) then Exit;
    glVertexAttrib4Nubv := SDL_GL_GetProcAddress('glVertexAttrib4Nubv');
    if not Assigned(glVertexAttrib4Nubv) then Exit;
    glVertexAttrib4Nuiv := SDL_GL_GetProcAddress('glVertexAttrib4Nuiv');
    if not Assigned(glVertexAttrib4Nuiv) then Exit;
    glVertexAttrib4Nusv := SDL_GL_GetProcAddress('glVertexAttrib4Nusv');
    if not Assigned(glVertexAttrib4Nusv) then Exit;
    glVertexAttrib4bv := SDL_GL_GetProcAddress('glVertexAttrib4bv');
    if not Assigned(glVertexAttrib4bv) then Exit;
    glVertexAttrib4d := SDL_GL_GetProcAddress('glVertexAttrib4d');
    if not Assigned(glVertexAttrib4d) then Exit;
    glVertexAttrib4dv := SDL_GL_GetProcAddress('glVertexAttrib4dv');
    if not Assigned(glVertexAttrib4dv) then Exit;
    glVertexAttrib4f := SDL_GL_GetProcAddress('glVertexAttrib4f');
    if not Assigned(glVertexAttrib4f) then Exit;
    glVertexAttrib4fv := SDL_GL_GetProcAddress('glVertexAttrib4fv');
    if not Assigned(glVertexAttrib4fv) then Exit;
    glVertexAttrib4iv := SDL_GL_GetProcAddress('glVertexAttrib4iv');
    if not Assigned(glVertexAttrib4iv) then Exit;
    glVertexAttrib4s := SDL_GL_GetProcAddress('glVertexAttrib4s');
    if not Assigned(glVertexAttrib4s) then Exit;
    glVertexAttrib4sv := SDL_GL_GetProcAddress('glVertexAttrib4sv');
    if not Assigned(glVertexAttrib4sv) then Exit;
    glVertexAttrib4ubv := SDL_GL_GetProcAddress('glVertexAttrib4ubv');
    if not Assigned(glVertexAttrib4ubv) then Exit;
    glVertexAttrib4uiv := SDL_GL_GetProcAddress('glVertexAttrib4uiv');
    if not Assigned(glVertexAttrib4uiv) then Exit;
    glVertexAttrib4usv := SDL_GL_GetProcAddress('glVertexAttrib4usv');
    if not Assigned(glVertexAttrib4usv) then Exit;
    glVertexAttribPointer := SDL_GL_GetProcAddress('glVertexAttribPointer');
    if not Assigned(glVertexAttribPointer) then Exit;
    Result := TRUE;

end;

function glext_LoadExtension(ext: String): Boolean;
begin

  Result := FALSE;

  if ext = 'GL_version_1_2' then Result := Load_GL_version_1_2
  else if ext = 'GL_ARB_imaging' then Result := Load_GL_ARB_imaging
  else if ext = 'GL_version_1_3' then Result := Load_GL_version_1_3
  else if ext = 'GL_ARB_multitexture' then Result := Load_GL_ARB_multitexture
  else if ext = 'GL_ARB_transpose_matrix' then Result := Load_GL_ARB_transpose_matrix
  else if ext = 'GL_ARB_multisample' then Result := Load_GL_ARB_multisample
  else if ext = 'GL_ARB_texture_env_add' then Result := Load_GL_ARB_texture_env_add
  {$IFDEF WINDOWS}
  else if ext = 'WGL_ARB_extensions_string' then Result := Load_WGL_ARB_extensions_string
  else if ext = 'WGL_ARB_buffer_region' then Result := Load_WGL_ARB_buffer_region
  {$ENDIF}
  else if ext = 'GL_ARB_texture_cube_map' then Result := Load_GL_ARB_texture_cube_map
  else if ext = 'GL_ARB_depth_texture' then Result := Load_GL_ARB_depth_texture
  else if ext = 'GL_ARB_point_parameters' then Result := Load_GL_ARB_point_parameters
  else if ext = 'GL_ARB_shadow' then Result := Load_GL_ARB_shadow
  else if ext = 'GL_ARB_shadow_ambient' then Result := Load_GL_ARB_shadow_ambient
  else if ext = 'GL_ARB_texture_border_clamp' then Result := Load_GL_ARB_texture_border_clamp
  else if ext = 'GL_ARB_texture_compression' then Result := Load_GL_ARB_texture_compression
  else if ext = 'GL_ARB_texture_env_combine' then Result := Load_GL_ARB_texture_env_combine
  else if ext = 'GL_ARB_texture_env_crossbar' then Result := Load_GL_ARB_texture_env_crossbar
  else if ext = 'GL_ARB_texture_env_dot3' then Result := Load_GL_ARB_texture_env_dot3
  else if ext = 'GL_ARB_texture_mirrored_repeat' then Result := Load_GL_ARB_texture_mirrored_repeat
  else if ext = 'GL_ARB_vertex_blend' then Result := Load_GL_ARB_vertex_blend
  else if ext = 'GL_ARB_vertex_program' then Result := Load_GL_ARB_vertex_program
  else if ext = 'GL_ARB_window_pos' then Result := Load_GL_ARB_window_pos
  else if ext = 'GL_EXT_422_pixels' then Result := Load_GL_EXT_422_pixels
  else if ext = 'GL_EXT_abgr' then Result := Load_GL_EXT_abgr
  else if ext = 'GL_EXT_bgra' then Result := Load_GL_EXT_bgra
  else if ext = 'GL_EXT_blend_color' then Result := Load_GL_EXT_blend_color
  else if ext = 'GL_EXT_blend_func_separate' then Result := Load_GL_EXT_blend_func_separate
  else if ext = 'GL_EXT_blend_logic_op' then Result := Load_GL_EXT_blend_logic_op
  else if ext = 'GL_EXT_blend_minmax' then Result := Load_GL_EXT_blend_minmax
  else if ext = 'GL_EXT_blend_subtract' then Result := Load_GL_EXT_blend_subtract
  else if ext = 'GL_EXT_clip_volume_hint' then Result := Load_GL_EXT_clip_volume_hint
  else if ext = 'GL_EXT_color_subtable' then Result := Load_GL_EXT_color_subtable
  else if ext = 'GL_EXT_compiled_vertex_array' then Result := Load_GL_EXT_compiled_vertex_array
  else if ext = 'GL_EXT_convolution' then Result := Load_GL_EXT_convolution
  else if ext = 'GL_EXT_histogram' then Result := Load_GL_EXT_histogram
  else if ext = 'GL_EXT_multi_draw_arrays' then Result := Load_GL_EXT_multi_draw_arrays
  else if ext = 'GL_EXT_packed_pixels' then Result := Load_GL_EXT_packed_pixels
  else if ext = 'GL_EXT_paletted_texture' then Result := Load_GL_EXT_paletted_texture
  else if ext = 'GL_EXT_point_parameters' then Result := Load_GL_EXT_point_parameters
  else if ext = 'GL_EXT_polygon_offset' then Result := Load_GL_EXT_polygon_offset
  else if ext = 'GL_EXT_separate_specular_color' then Result := Load_GL_EXT_separate_specular_color
  else if ext = 'GL_EXT_shadow_funcs' then Result := Load_GL_EXT_shadow_funcs
  else if ext = 'GL_EXT_shared_texture_palette' then Result := Load_GL_EXT_shared_texture_palette
  else if ext = 'GL_EXT_stencil_two_side' then Result := Load_GL_EXT_stencil_two_side
  else if ext = 'GL_EXT_stencil_wrap' then Result := Load_GL_EXT_stencil_wrap
  else if ext = 'GL_EXT_subtexture' then Result := Load_GL_EXT_subtexture
  else if ext = 'GL_EXT_texture3D' then Result := Load_GL_EXT_texture3D
  else if ext = 'GL_EXT_texture_compression_s3tc' then Result := Load_GL_EXT_texture_compression_s3tc
  else if ext = 'GL_EXT_texture_env_add' then Result := Load_GL_EXT_texture_env_add
  else if ext = 'GL_EXT_texture_env_combine' then Result := Load_GL_EXT_texture_env_combine
  else if ext = 'GL_EXT_texture_env_dot3' then Result := Load_GL_EXT_texture_env_dot3
  else if ext = 'GL_EXT_texture_filter_anisotropic' then Result := Load_GL_EXT_texture_filter_anisotropic
  else if ext = 'GL_EXT_texture_lod_bias' then Result := Load_GL_EXT_texture_lod_bias
  else if ext = 'GL_EXT_texture_object' then Result := Load_GL_EXT_texture_object
  else if ext = 'GL_EXT_vertex_array' then Result := Load_GL_EXT_vertex_array
  else if ext = 'GL_EXT_vertex_shader' then Result := Load_GL_EXT_vertex_shader
  else if ext = 'GL_EXT_vertex_weighting' then Result := Load_GL_EXT_vertex_weighting
  else if ext = 'GL_HP_occlusion_test' then Result := Load_GL_HP_occlusion_test
  else if ext = 'GL_NV_blend_square' then Result := Load_GL_NV_blend_square
  else if ext = 'GL_NV_copy_depth_to_color' then Result := Load_GL_NV_copy_depth_to_color
  else if ext = 'GL_NV_depth_clamp' then Result := Load_GL_NV_depth_clamp
  else if ext = 'GL_NV_evaluators' then Result := Load_GL_NV_evaluators
  else if ext = 'GL_NV_fence' then Result := Load_GL_NV_fence
  else if ext = 'GL_NV_fog_distance' then Result := Load_GL_NV_fog_distance
  else if ext = 'GL_NV_light_max_exponent' then Result := Load_GL_NV_light_max_exponent
  else if ext = 'GL_NV_multisample_filter_hint' then Result := Load_GL_NV_multisample_filter_hint
  else if ext = 'GL_NV_occlusion_query' then Result := Load_GL_NV_occlusion_query
  else if ext = 'GL_NV_packed_depth_stencil' then Result := Load_GL_NV_packed_depth_stencil
  else if ext = 'GL_NV_point_sprite' then Result := Load_GL_NV_point_sprite
  else if ext = 'GL_NV_register_combiners' then Result := Load_GL_NV_register_combiners
  else if ext = 'GL_NV_register_combiners2' then Result := Load_GL_NV_register_combiners2
  else if ext = 'GL_NV_texgen_emboss' then Result := Load_GL_NV_texgen_emboss
  else if ext = 'GL_NV_texgen_reflection' then Result := Load_GL_NV_texgen_reflection
  else if ext = 'GL_NV_texture_compression_vtc' then Result := Load_GL_NV_texture_compression_vtc
  else if ext = 'GL_NV_texture_env_combine4' then Result := Load_GL_NV_texture_env_combine4
  else if ext = 'GL_NV_texture_rectangle' then Result := Load_GL_NV_texture_rectangle
  else if ext = 'GL_NV_texture_shader' then Result := Load_GL_NV_texture_shader
  else if ext = 'GL_NV_texture_shader2' then Result := Load_GL_NV_texture_shader2
  else if ext = 'GL_NV_texture_shader3' then Result := Load_GL_NV_texture_shader3
  else if ext = 'GL_NV_vertex_array_range' then Result := Load_GL_NV_vertex_array_range
  else if ext = 'GL_NV_vertex_array_range2' then Result := Load_GL_NV_vertex_array_range2
  else if ext = 'GL_NV_vertex_program' then Result := Load_GL_NV_vertex_program
  else if ext = 'GL_NV_vertex_program1_1' then Result := Load_GL_NV_vertex_program1_1
  else if ext = 'GL_ATI_element_array' then Result := Load_GL_ATI_element_array
  else if ext = 'GL_ATI_envmap_bumpmap' then Result := Load_GL_ATI_envmap_bumpmap
  else if ext = 'GL_ATI_fragment_shader' then Result := Load_GL_ATI_fragment_shader
  else if ext = 'GL_ATI_pn_triangles' then Result := Load_GL_ATI_pn_triangles
  else if ext = 'GL_ATI_texture_mirror_once' then Result := Load_GL_ATI_texture_mirror_once
  else if ext = 'GL_ATI_vertex_array_object' then Result := Load_GL_ATI_vertex_array_object
  else if ext = 'GL_ATI_vertex_streams' then Result := Load_GL_ATI_vertex_streams
  {$IFDEF WINDOWS}
  else if ext = 'WGL_I3D_image_buffer' then Result := Load_WGL_I3D_image_buffer
  else if ext = 'WGL_I3D_swap_frame_lock' then Result := Load_WGL_I3D_swap_frame_lock
  else if ext = 'WGL_I3D_swap_frame_usage' then Result := Load_WGL_I3D_swap_frame_usage
  {$ENDIF}
  else if ext = 'GL_3DFX_texture_compression_FXT1' then Result := Load_GL_3DFX_texture_compression_FXT1
  else if ext = 'GL_IBM_cull_vertex' then Result := Load_GL_IBM_cull_vertex
  else if ext = 'GL_IBM_multimode_draw_arrays' then Result := Load_GL_IBM_multimode_draw_arrays
  else if ext = 'GL_IBM_raster_pos_clip' then Result := Load_GL_IBM_raster_pos_clip
  else if ext = 'GL_IBM_texture_mirrored_repeat' then Result := Load_GL_IBM_texture_mirrored_repeat
  else if ext = 'GL_IBM_vertex_array_lists' then Result := Load_GL_IBM_vertex_array_lists
  else if ext = 'GL_MESA_resize_buffers' then Result := Load_GL_MESA_resize_buffers
  else if ext = 'GL_MESA_window_pos' then Result := Load_GL_MESA_window_pos
  else if ext = 'GL_OML_interlace' then Result := Load_GL_OML_interlace
  else if ext = 'GL_OML_resample' then Result := Load_GL_OML_resample
  else if ext = 'GL_OML_subsample' then Result := Load_GL_OML_subsample
  else if ext = 'GL_SGIS_generate_mipmap' then Result := Load_GL_SGIS_generate_mipmap
  else if ext = 'GL_SGIS_multisample' then Result := Load_GL_SGIS_multisample
  else if ext = 'GL_SGIS_pixel_texture' then Result := Load_GL_SGIS_pixel_texture
  else if ext = 'GL_SGIS_texture_border_clamp' then Result := Load_GL_SGIS_texture_border_clamp
  else if ext = 'GL_SGIS_texture_color_mask' then Result := Load_GL_SGIS_texture_color_mask
  else if ext = 'GL_SGIS_texture_edge_clamp' then Result := Load_GL_SGIS_texture_edge_clamp
  else if ext = 'GL_SGIS_texture_lod' then Result := Load_GL_SGIS_texture_lod
  else if ext = 'GL_SGIS_depth_texture' then Result := Load_GL_SGIS_depth_texture
  else if ext = 'GL_SGIX_fog_offset' then Result := Load_GL_SGIX_fog_offset
  else if ext = 'GL_SGIX_interlace' then Result := Load_GL_SGIX_interlace
  else if ext = 'GL_SGIX_shadow_ambient' then Result := Load_GL_SGIX_shadow_ambient
  else if ext = 'GL_SGI_color_matrix' then Result := Load_GL_SGI_color_matrix
  else if ext = 'GL_SGI_color_table' then Result := Load_GL_SGI_color_table
  else if ext = 'GL_SGI_texture_color_table' then Result := Load_GL_SGI_texture_color_table
  else if ext = 'GL_SUN_vertex' then Result := Load_GL_SUN_vertex
  else if ext = 'GL_ARB_fragment_program' then Result := Load_GL_ARB_fragment_program
  else if ext = 'GL_ATI_text_fragment_shader' then Result := Load_GL_ATI_text_fragment_shader
  else if ext = 'GL_APPLE_client_storage' then Result := Load_GL_APPLE_client_storage
  else if ext = 'GL_APPLE_element_array' then Result := Load_GL_APPLE_element_array
  else if ext = 'GL_APPLE_fence' then Result := Load_GL_APPLE_fence
  else if ext = 'GL_APPLE_vertex_array_object' then Result := Load_GL_APPLE_vertex_array_object
  else if ext = 'GL_APPLE_vertex_array_range' then Result := Load_GL_APPLE_vertex_array_range
  {$IFDEF WINDOWS}
  else if ext = 'WGL_ARB_pixel_format' then Result := Load_WGL_ARB_pixel_format
  else if ext = 'WGL_ARB_make_current_read' then Result := Load_WGL_ARB_make_current_read
  else if ext = 'WGL_ARB_pbuffer' then Result := Load_WGL_ARB_pbuffer
  else if ext = 'WGL_EXT_swap_control' then Result := Load_WGL_EXT_swap_control
  else if ext = 'WGL_ARB_render_texture' then Result := Load_WGL_ARB_render_texture
  else if ext = 'WGL_EXT_extensions_string' then Result := Load_WGL_EXT_extensions_string
  else if ext = 'WGL_EXT_make_current_read' then Result := Load_WGL_EXT_make_current_read
  else if ext = 'WGL_EXT_pbuffer' then Result := Load_WGL_EXT_pbuffer
  else if ext = 'WGL_EXT_pixel_format' then Result := Load_WGL_EXT_pixel_format
  else if ext = 'WGL_I3D_digital_video_control' then Result := Load_WGL_I3D_digital_video_control
  else if ext = 'WGL_I3D_gamma' then Result := Load_WGL_I3D_gamma
  else if ext = 'WGL_I3D_genlock' then Result := Load_WGL_I3D_genlock
  {$ENDIF}
  else if ext = 'GL_ARB_matrix_palette' then Result := Load_GL_ARB_matrix_palette
  else if ext = 'GL_NV_element_array' then Result := Load_GL_NV_element_array
  else if ext = 'GL_NV_float_buffer' then Result := Load_GL_NV_float_buffer
  else if ext = 'GL_NV_fragment_program' then Result := Load_GL_NV_fragment_program
  else if ext = 'GL_NV_primitive_restart' then Result := Load_GL_NV_primitive_restart
  else if ext = 'GL_NV_vertex_program2' then Result := Load_GL_NV_vertex_program2
  {$IFDEF WINDOWS}
  else if ext = 'WGL_NV_render_texture_rectangle' then Result := Load_WGL_NV_render_texture_rectangle
  {$ENDIF}
  else if ext = 'GL_NV_pixel_data_range' then Result := Load_GL_NV_pixel_data_range
  else if ext = 'GL_EXT_texture_rectangle' then Result := Load_GL_EXT_texture_rectangle
  else if ext = 'GL_S3_s3tc' then Result := Load_GL_S3_s3tc
  else if ext = 'GL_ATI_draw_buffers' then Result := Load_GL_ATI_draw_buffers
  {$IFDEF WINDOWS}
  else if ext = 'WGL_ATI_pixel_format_float' then Result := Load_WGL_ATI_pixel_format_float
  {$ENDIF}
  else if ext = 'GL_ATI_texture_env_combine3' then Result := Load_GL_ATI_texture_env_combine3
  else if ext = 'GL_ATI_texture_float' then Result := Load_GL_ATI_texture_float
  else if ext = 'GL_NV_texture_expand_normal' then Result := Load_GL_NV_texture_expand_normal
  else if ext = 'GL_NV_half_float' then Result := Load_GL_NV_half_float
  else if ext = 'GL_ATI_map_object_buffer' then Result := Load_GL_ATI_map_object_buffer
  else if ext = 'GL_ATI_separate_stencil' then Result := Load_GL_ATI_separate_stencil
  else if ext = 'GL_ATI_vertex_attrib_array_object' then Result := Load_GL_ATI_vertex_attrib_array_object
  else if ext = 'GL_ARB_vertex_buffer_object' then Result := Load_GL_ARB_vertex_buffer_object
  else if ext = 'GL_ARB_occlusion_query' then Result := Load_GL_ARB_occlusion_query
  else if ext = 'GL_ARB_shader_objects' then Result := Load_GL_ARB_shader_objects
  else if ext = 'GL_ARB_vertex_shader' then Result := Load_GL_ARB_vertex_shader
  else if ext = 'GL_ARB_fragment_shader' then Result := Load_GL_ARB_fragment_shader
  else if ext = 'GL_ARB_shading_language_100' then Result := Load_GL_ARB_shading_language_100
  else if ext = 'GL_ARB_texture_non_power_of_two' then Result := Load_GL_ARB_texture_non_power_of_two
  else if ext = 'GL_ARB_point_sprite' then Result := Load_GL_ARB_point_sprite
  else if ext = 'GL_EXT_depth_bounds_test' then Result := Load_GL_EXT_depth_bounds_test
  else if ext = 'GL_EXT_secondary_color' then Result := Load_GL_EXT_secondary_color
  else if ext = 'GL_EXT_texture_mirror_clamp' then Result := Load_GL_EXT_texture_mirror_clamp
  else if ext = 'GL_EXT_blend_equation_separate' then Result := Load_GL_EXT_blend_equation_separate
  else if ext = 'GL_MESA_pack_invert' then Result := Load_GL_MESA_pack_invert
  else if ext = 'GL_MESA_ycbcr_texture' then Result := Load_GL_MESA_ycbcr_texture
  else if ext = 'GL_ARB_fragment_program_shadow' then Result := Load_GL_ARB_fragment_program_shadow
  else if ext = 'GL_EXT_fog_coord' then Result := Load_GL_EXT_fog_coord
  else if ext = 'GL_NV_fragment_program_option' then Result := Load_GL_NV_fragment_program_option
  else if ext = 'GL_EXT_pixel_buffer_object' then Result := Load_GL_EXT_pixel_buffer_object
  else if ext = 'GL_NV_fragment_program2' then Result := Load_GL_NV_fragment_program2
  else if ext = 'GL_NV_vertex_program2_option' then Result := Load_GL_NV_vertex_program2_option
  else if ext = 'GL_NV_vertex_program3' then Result := Load_GL_NV_vertex_program3
  else if ext = 'GL_ARB_draw_buffers' then Result := Load_GL_ARB_draw_buffers
  else if ext = 'GL_ARB_texture_rectangle' then Result := Load_GL_ARB_texture_rectangle
  else if ext = 'GL_ARB_color_buffer_float' then Result := Load_GL_ARB_color_buffer_float
  else if ext = 'GL_ARB_half_float_pixel' then Result := Load_GL_ARB_half_float_pixel
  else if ext = 'GL_ARB_texture_float' then Result := Load_GL_ARB_texture_float
  else if ext = 'GL_EXT_texture_compression_dxt1' then Result := Load_GL_EXT_texture_compression_dxt1
  else if ext = 'GL_ARB_pixel_buffer_object' then Result := Load_GL_ARB_pixel_buffer_object
  else if ext = 'GL_EXT_framebuffer_object' then Result := Load_GL_EXT_framebuffer_object
  else if ext = 'GL_version_1_4' then Result := Load_GL_version_1_4
  else if ext = 'GL_version_1_5' then Result := Load_GL_version_1_5
  else if ext = 'GL_version_2_0' then Result := Load_GL_version_2_0

end;

end.