diff options
Diffstat (limited to 'src/lib')
-rw-r--r-- | src/lib/freetype/demo/UFont.pas | 2641 | ||||
-rw-r--r-- | src/lib/freetype/demo/engine-test.bdsproj (renamed from src/lib/freetype/demo/lesson43.bdsproj) | 2 | ||||
-rw-r--r-- | src/lib/freetype/demo/engine-test.dpr (renamed from src/lib/freetype/demo/lesson43.dpr) | 702 | ||||
-rw-r--r-- | src/lib/freetype/demo/engine-test.lpi (renamed from src/lib/freetype/demo/lesson43.lpi) | 113 | ||||
-rw-r--r-- | src/lib/freetype/demo/nehe/UFreeType.pas | 326 | ||||
-rw-r--r-- | src/lib/freetype/demo/nehe/lesson43.bdsproj | 175 | ||||
-rw-r--r-- | src/lib/freetype/demo/nehe/lesson43.dpr | 289 | ||||
-rw-r--r-- | src/lib/freetype/demo/nehe/readme.txt | 9 | ||||
-rw-r--r-- | src/lib/freetype/demo/switches.inc | 1 |
9 files changed, 1144 insertions, 3114 deletions
diff --git a/src/lib/freetype/demo/UFont.pas b/src/lib/freetype/demo/UFont.pas deleted file mode 100644 index c15ff4ca..00000000 --- a/src/lib/freetype/demo/UFont.pas +++ /dev/null @@ -1,2641 +0,0 @@ -unit UFont;
-
-{$IFDEF FPC}
- {$mode delphi}{$H+}
-{$ENDIF}
-
-{$DEFINE HasInline}
-
-interface
-
-// Flip direction of y-axis.
-// Default is a cartesian coordinate system with y-axis in upper direction
-// but with USDX the y-axis is in lower direction.
-{.$DEFINE FLIP_YAXIS}
-{.$DEFINE BITMAP_FONT}
-
-uses
- FreeType,
- gl,
- glext,
- glu,
- sdl,
- {$IFDEF BITMAP_FONT}
- UTexture,
- {$ENDIF}
- Math,
- Classes,
- SysUtils;
-
-type
-
- PGLubyteArray = ^TGLubyteArray;
- TGLubyteArray = array[0 .. (MaxInt div SizeOf(GLubyte))-1] of GLubyte;
- TGLubyteDynArray = array of GLubyte;
-
- TWideStringArray = array of WideString;
-
- TGLColor = packed record
- case byte of
- 0: ( vals: array[0..3] of GLfloat; );
- 1: ( r, g, b, a: GLfloat; );
- end;
-
- TBoundsDbl = record
- Left, Right: double;
- Bottom, Top: double;
- end;
-
- TPositionDbl = record
- X, Y: double;
- end;
-
- TTextureSize = record
- Width, Height: integer;
- end;
-
- TBitmapCoords = record
- Left, Top: double;
- Width, Height: integer;
- end;
-
- {**
- * Abstract base class representing a glyph.
- *}
- TGlyph = class
- protected
- function GetAdvance(): TPositionDbl; virtual; abstract;
- function GetBounds(): TBoundsDbl; virtual; abstract;
- public
- procedure Render(UseDisplayLists: boolean); virtual; abstract;
- procedure RenderReflection(); virtual; abstract;
-
- {** Distance to next glyph (in pixels) *}
- property Advance: TPositionDbl read GetAdvance;
- {** Glyph bounding box (in pixels) *}
- property Bounds: TBoundsDbl read GetBounds;
- end;
-
- {**
- * Font styles used by TFont.Style
- *}
- TFontStyle = set of (Italic, Underline, Reflect);
-
- {**
- * Base font class.
- *}
- TFont = class
- private
- {** Non-virtual reset-method used in Create() and Reset() *}
- procedure ResetIntern();
-
- protected
- fStyle: TFontStyle;
- fUseKerning: boolean;
- fLineSpacing: single; // must be inited by subclass
- fReflectionSpacing: single; // must be inited by subclass to -2*Descender
- fGlyphSpacing: single;
- fReflectionPass: boolean;
-
- {**
- * Splits lines in Text seperated by newline (char-code #13).
- * @param Text: UTF-8 encoded string
- * @param Lines: splitted WideString lines
- *}
- procedure SplitLines(const Text: UTF8String; var Lines: TWideStringArray);
-
- {**
- * Print an array of WideStrings. Each array-item is a line of text.
- * Lines of text are seperated by the line-spacing.
- * This is the base function for all text drawing.
- *}
- procedure Print(const Text: TWideStringArray); overload; virtual;
-
- {**
- * Draws an underline.
- *}
- procedure DrawUnderline(const Text: WideString); virtual;
-
- {**
- * Renders (one) line of text.
- *}
- procedure Render(const Text: WideString); virtual; abstract;
-
- {**
- * Returns the bounds of text-lines contained in Text.
- * @param Advance: if true the right bound is set to the advance instead
- * of the minimal right bound.
- *}
- function BBox(const Text: TWideStringArray; Advance: boolean): TBoundsDbl; overload; virtual; abstract;
-
- {**
- * Resets all user settings to default values.
- * Override methods should always call the inherited version.
- *}
- procedure Reset(); virtual;
-
- function GetHeight(): single; virtual; abstract;
- function GetAscender(): single; virtual; abstract;
- function GetDescender(): single; virtual; abstract;
- procedure SetLineSpacing(Spacing: single); virtual;
- function GetLineSpacing(): single; virtual;
- procedure SetGlyphSpacing(Spacing: single); virtual;
- function GetGlyphSpacing(): single; virtual;
- procedure SetReflectionSpacing(Spacing: single); virtual;
- function GetReflectionSpacing(): single; virtual;
- procedure SetStyle(Style: TFontStyle); virtual;
- function GetStyle(): TFontStyle; virtual;
- function GetUnderlinePosition(): single; virtual; abstract;
- function GetUnderlineThickness(): single; virtual; abstract;
- procedure SetUseKerning(Enable: boolean); virtual;
- function GetUseKerning(): boolean; virtual;
- procedure SetReflectionPass(Enable: boolean); virtual;
-
- {** Returns true if the current render-pass is used to draw the reflection *}
- property ReflectionPass: boolean read fReflectionPass write SetReflectionPass;
-
- public
- constructor Create();
- destructor Destroy(); override;
-
- {**
- * Prints a text.
- *}
- procedure Print(const Text: WideString); overload;
- {** UTF-8 version of @link Print(const Text: WideString) *}
- procedure Print(const Text: string); overload;
-
- {**
- * Calculates the bounding box (width and height) around Text.
- * Works with Italic and Underline styles but reflections created
- * with the Reflect style are not considered.
- * Note that the width might differ due to kerning with appended text,
- * e.g. Width('VA') <= Width('V') + Width('A').
- * @param Advance: if set to true, Result.Right is set to the advance of
- * the given text rather than the min. right border. The advance width is
- * bigger than the text's width as it additionally contains the advance
- * and glyph-spacing of the last character.
- *}
- function BBox(const Text: WideString; Advance: boolean = false): TBoundsDbl; overload;
- {** UTF-8 version of @link BBox(const Text: WideString) *}
- function BBox(const Text: UTF8String; Advance: boolean = false): TBoundsDbl; overload;
-
- {** Font height *}
- property Height: single read GetHeight;
- {** Vertical distance from baseline to top of glyph *}
- property Ascender: single read GetAscender;
- {** Vertical distance from baseline to bottom of glyph *}
- property Descender: single read GetDescender;
- {** Vertical distance between two baselines *}
- property LineSpacing: single read GetLineSpacing write SetLineSpacing;
- {** Space between end and start of next glyph added to the advance width *}
- property GlyphSpacing: single read GetGlyphSpacing write SetGlyphSpacing;
- {** Distance between normal baseline and baseline of the reflection *}
- property ReflectionSpacing: single read GetReflectionSpacing write SetReflectionSpacing;
- {** Font style (italic/underline/...) *}
- property Style: TFontStyle read GetStyle write SetStyle;
- {** If set to true (default) kerning will be used if available *}
- property UseKerning: boolean read GetUseKerning write SetUseKerning;
- end;
-
-const
- // max. number of mipmap levels that a TScalableFont can contain
- cMaxMipmapLevel = 5;
-
-type
- {**
- * Wrapper around TFont to allow font size changes.
- * The font is scaled to the requested size by a modelview matrix
- * transformation (glScale) and not by rescaling the internal bitmap
- * representation. This way changing the size is really fast but the result
- * may lack quality on large or small scale factors.
- *}
- TScalableFont = class(TFont)
- private
- procedure ResetIntern();
-
- protected
- fScale: single; ///< current height to base-font height ratio
- fAspect: single; ///< width to height aspect
- fBaseFont: TFont; ///< shortcut for fMipmapFonts[0]
- fUseMipmaps: boolean; ///< true if mipmap fonts are generated
- /// Mipmap fonts (size[level+1] = size[level]/2)
- fMipmapFonts: array[0..cMaxMipmapLevel] of TFont;
-
- procedure Render(const Text: WideString); override;
- procedure Print(const Text: TWideStringArray); override;
- function BBox(const Text: TWideStringArray; Advance: boolean): TBoundsDbl; override;
-
- {**
- * Callback called for creation of each mipmap font.
- * Must be defined by the subclass.
- * Mipmaps created by this method are managed and freed by TScalableFont.
- *}
- function CreateMipmap(Level: integer; Scale: single): TFont; virtual; abstract;
-
- {**
- * Returns the mipmap level considering the current scale and projection
- * matrix.
- *}
- function GetMipmapLevel(): integer;
-
- {**
- * Returns the scale applied to the given mipmap font.
- * fScale * fBaseFont.Height / fMipmapFont[Level].Height
- *}
- function GetMipmapScale(Level: integer): single;
-
- {**
- * Chooses the mipmap that looks nicest with current scale and projection
- * matrix.
- *}
- function ChooseMipmapFont(): TFont;
-
- procedure SetHeight(Height: single); virtual;
- function GetHeight(): single; override;
- procedure SetAspect(Aspect: single); virtual;
- function GetAspect(): single; virtual;
- function GetAscender(): single; override;
- function GetDescender(): single; override;
- procedure SetLineSpacing(Spacing: single); override;
- function GetLineSpacing(): single; override;
- procedure SetGlyphSpacing(Spacing: single); override;
- function GetGlyphSpacing(): single; override;
- procedure SetReflectionSpacing(Spacing: single); override;
- function GetReflectionSpacing(): single; override;
- procedure SetStyle(Style: TFontStyle); override;
- function GetStyle(): TFontStyle; override;
- function GetUnderlinePosition(): single; override;
- function GetUnderlineThickness(): single; override;
- procedure SetUseKerning(Enable: boolean); override;
-
- public
- {**
- * Creates a wrapper to make the base-font Font scalable.
- * If UseMipmaps is set to true smaller fonts are created so that a
- * resized (Height property changed) font looks nicer.
- * The font passed is managed and freed by TScalableFont.
- *}
- constructor Create(Font: TFont; UseMipmaps: boolean); overload;
-
- {**
- * Frees memory. The fonts passed on Create() and mipmap creation
- * are freed too.
- *}
- destructor Destroy(); override;
-
- {** @see TFont.Reset *}
- procedure Reset(); override;
-
- {** Font height *}
- property Height: single read GetHeight write SetHeight;
- {** Factor for font stretching (NewWidth = Width*Aspect), 1.0 by default *}
- property Aspect: single read GetAspect write SetAspect;
- end;
-
- {**
- * Table for storage of max. 256 glyphs.
- * Used for the second cache level. Indexed by the LSB of the WideChar
- * char-code.
- *}
- PGlyphTable = ^TGlyphTable;
- TGlyphTable = array[0..255] of TGlyph;
-
- {**
- * Cache for glyphs of a single font.
- * The cached glyphs are stored inside a hash-list.
- * Hashing is performed in two steps:
- * 1. the least significant byte (LSB) of the WideChar character code
- * is removed (shr 8) and the result (we call it BaseCode here) looked up in
- * the hash-list.
- * 2. Each entry of the hash-list contains a table with max. 256 entries.
- * The LSB of the char-code of a glyph is the table-offset of that glyph.
- *}
- TGlyphCache = class
- private
- fHash: TList;
-
- {**
- * Finds a glyph-table storing cached glyphs with base-code BaseCode
- * (= upper char-code bytes) in the hash-list and returns the table and
- * its index.
- * @param InsertPos: the position of the tyble in the list if it was found,
- * otherwise the position the table should be inserted
- *}
- function FindGlyphTable(BaseCode: cardinal; out InsertPos: integer): PGlyphTable;
-
- public
- constructor Create();
- destructor Destroy(); override;
-
- {**
- * Add glyph Glyph with char-code ch to the cache.
- * @returns @true on success, @false otherwise
- *}
- function AddGlyph(ch: WideChar; const Glyph: TGlyph): boolean;
-
- {**
- * Removes the glyph with char-code ch from the cache.
- *}
- procedure DeleteGlyph(ch: WideChar);
-
- {**
- * Removes the glyph with char-code ch from the cache.
- *}
- function GetGlyph(ch: WideChar): TGlyph;
-
- {**
- * Checks if a glyph with char-code ch is cached.
- *}
- function HasGlyph(ch: WideChar): boolean;
-
- {**
- * Remove and free all cached glyphs. If KeepBaseSet is set to
- * true, cached characters in the range 0..255 will not be flushed.
- *}
- procedure FlushCache(KeepBaseSet: boolean);
- end;
-
- {**
- * Entry of a glyph-cache's (TGlyphCache) hash.
- * Stores a BaseCode (upper-bytes of a glyph's char-code) and a table
- * with all glyphs cached at the moment with that BaseCode.
- *}
- TGlyphCacheHashEntry = class
- private
- fBaseCode: cardinal;
- public
- GlyphTable: TGlyphTable;
-
- constructor Create(BaseCode: cardinal);
-
- {** Base-code (upper-bytes) of the glyphs stored in this entry's table *}
- property BaseCode: cardinal read fBaseCode;
- end;
-
- TCachedFont = class(TFont)
- protected
- fCache: TGlyphCache;
-
- {**
- * Retrieves a cached glyph with char-code ch from cache.
- * If the glyph is not already cached, it is loaded with LoadGlyph().
- *}
- function GetGlyph(ch: WideChar): TGlyph;
-
- {**
- * Callback to create (load) a glyph with char-code ch.
- * Implemented by subclasses.
- *}
- function LoadGlyph(ch: WideChar): TGlyph; virtual; abstract;
-
- public
- constructor Create();
- destructor Destroy(); override;
-
- {**
- * Remove and free all cached glyphs. If KeepBaseSet is set to
- * true, the base glyphs are not be flushed.
- * @see TGlyphCache.FlushCache
- *}
- procedure FlushCache(KeepBaseSet: boolean);
- end;
-
- TFTFont = class;
-
- {**
- * Freetype glyph.
- * Each glyph stores a texture with the glyph's image.
- *}
- TFTGlyph = class(TGlyph)
- private
- fCharIndex: FT_UInt; ///< Freetype specific char-index (<> char-code)
- fDisplayList: GLuint; ///< Display-list ID
- fTexture: GLuint; ///< Texture ID
- fBitmapCoords: TBitmapCoords; ///< Left/Top offset and Width/Height of the bitmap (in pixels)
- fTexOffset: TPositionDbl; ///< Right and bottom texture offset for removal of power-of-2 padding
- fTexSize: TTextureSize; ///< Texture size in pixels
-
- fFont: TFTFont; ///< Font associated with this glyph
- fAdvance: TPositionDbl; ///< Advance width of this glyph
- fBounds: TBoundsDbl; ///< Glyph bounds
- fOutset: single; ///< Extrusion outset
-
- {**
- * Extrudes the outline of a glyph's bitmap stored in TexBuffer with size
- * fTexSize by Outset pixels.
- * This is useful to create bold or outlined fonts.
- * TexBuffer must be 2*Ceil(Outset) pixels higher and wider than the
- * original glyph bitmap, otherwise the glyph borders cannot be extruded
- * correctly.
- * The bitmap must be 2* pixels wider and higher than the
- * original glyph's bitmap with the latter centered in it.
- *}
- procedure Extrude(var TexBuffer: TGLubyteDynArray; Outset: single);
-
- {**
- * Creates an OpenGL texture (and display list) for the glyph.
- * The glyph's and bitmap's metrics are set correspondingly.
- * @param LoadFlags: flags passed to FT_Load_Glyph()
- * @raises Exception if the glyph could not be initialized
- *}
- procedure CreateTexture(LoadFlags: FT_Int32);
-
- protected
- function GetAdvance(): TPositionDbl; override;
- function GetBounds(): TBoundsDbl; override;
-
- public
- {**
- * Creates a glyph with char-code ch from font Font.
- * @param LoadFlags: flags passed to FT_Load_Glyph()
- *}
- constructor Create(Font: TFTFont; ch: WideChar; Outset: single;
- LoadFlags: FT_Int32);
- destructor Destroy(); override;
-
- {** Renders the glyph (normal render pass) *}
- procedure Render(UseDisplayLists: boolean); override;
- {** Renders the glyph's reflection *}
- procedure RenderReflection(); override;
-
- {** Freetype specific char-index (<> char-code) *}
- property CharIndex: FT_UInt read fCharIndex;
- end;
-
- {**
- * Freetype font class.
- *}
- TFTFont = class(TCachedFont)
- private
- procedure ResetIntern();
-
- protected
- fFilename: string; ///< filename of the font-file
- fSize: integer; ///< Font base size (in pixels)
- fOutset: single; ///< size of outset extrusion (in pixels)
- fFace: FT_Face; ///< Holds the height of the font
- fLoadFlags: FT_Int32; ///< FT glpyh load-flags
- fFontUnitScale: TPositionDbl; ///< FT font-units to pixel ratio
- fUseDisplayLists: boolean; ///< true: use display-lists, false: direct drawing
-
- {** @see TCachedFont.LoadGlyph *}
- function LoadGlyph(ch: WideChar): TGlyph; override;
-
- procedure Render(const Text: WideString); override;
- function BBox(const Text: TWideStringArray; Advance: boolean): TBoundsDbl; override;
-
- function GetHeight(): single; override;
- function GetAscender(): single; override;
- function GetDescender(): single; override;
- function GetUnderlinePosition(): single; override;
- function GetUnderlineThickness(): single; override;
-
- property Face: FT_Face read fFace;
-
- public
- {**
- * Creates a font of size Size (in pixels) from the file Filename.
- * If Outset (in pixels) is set to a value > 0 the glyphs will be extruded
- * at their borders. Use it for e.g. a bold effect.
- * @param LoadFlags: flags passed to FT_Load_Glyph()
- * @raises Exception if the font-file could not be loaded
- *}
- constructor Create(const Filename: string;
- Size: integer; Outset: single = 0.0;
- LoadFlags: FT_Int32 = FT_LOAD_DEFAULT);
-
- {**
- * Frees all resources associated with the font.
- *}
- destructor Destroy(); override;
-
- {** @see TFont.Reset *}
- procedure Reset(); override;
-
- {** Size of the base font *}
- property Size: integer read fSize;
- {** Outset size *}
- property Outset: single read fOutset;
- end;
-
- TFTScalableFont = class(TScalableFont)
- protected
- function GetOutset(): single; virtual;
- function CreateMipmap(Level: integer; Scale: single): TFont; override;
-
- public
- {**
- * Creates a scalable font of size Size (in pixels) from the file Filename.
- * OutsetAmount is the ratio of the glyph extrusion.
- * The extrusion in pixels is Size*OutsetAmount
- * (0.0 -> no extrusion, 0.1 -> 10%).
- *}
- constructor Create(const Filename: string;
- Size: integer; OutsetAmount: single = 0.0;
- UseMipmaps: boolean = true);
-
- {** @see TGlyphCache.FlushCache *}
- procedure FlushCache(KeepBaseSet: boolean);
-
- {** Outset size (in pixels) of the scaled font *}
- property Outset: single read GetOutset;
- end;
-
-
- {**
- * Represents a freetype font with an additional outline around its glyphs.
- * The outline size is passed on creation and cannot be changed later.
- *}
- TFTOutlineFont = class(TFont)
- private
- fFilename: string;
- fSize: integer;
- fOutset: single;
- fInnerFont, fOutlineFont: TFTFont;
- fOutlineColor: TGLColor;
-
- procedure ResetIntern();
-
- protected
- procedure DrawUnderline(const Text: WideString); override;
- procedure Render(const Text: WideString); override;
- function BBox(const Text: TWideStringArray; Advance: boolean): TBoundsDbl; override;
-
- function GetHeight(): single; override;
- function GetAscender(): single; override;
- function GetDescender(): single; override;
- procedure SetLineSpacing(Spacing: single); override;
- procedure SetGlyphSpacing(Spacing: single); override;
- procedure SetReflectionSpacing(Spacing: single); override;
- procedure SetStyle(Style: TFontStyle); override;
- function GetStyle(): TFontStyle; override;
- function GetUnderlinePosition(): single; override;
- function GetUnderlineThickness(): single; override;
- procedure SetUseKerning(Enable: boolean); override;
- procedure SetReflectionPass(Enable: boolean); override;
-
- public
- constructor Create(const Filename: string;
- Size: integer; Outset: single;
- LoadFlags: FT_Int32 = FT_LOAD_DEFAULT);
- destructor Destroy; override;
-
- {** Sets the color of the outline *}
- procedure SetOutlineColor(r, g, b: GLfloat; a: GLfloat = 1.0);
-
- {** @see TGlyphCache.FlushCache *}
- procedure FlushCache(KeepBaseSet: boolean);
-
- {** @see TFont.Reset *}
- procedure Reset(); override;
-
- {** Size of the base font *}
- property Size: integer read fSize;
- {** Outset size *}
- property Outset: single read fOutset;
- end;
-
- {**
- * Wrapper around TOutlineFont to allow font resizing.
- * @see TScalableFont
- *}
- TFTScalableOutlineFont = class(TScalableFont)
- protected
- function GetOutset(): single; virtual;
- function CreateMipmap(Level: integer; Scale: single): TFont; override;
-
- public
- constructor Create(const Filename: string;
- Size: integer; OutsetAmount: single;
- UseMipmaps: boolean = true);
-
- {** Sets the color of the outline *}
- procedure SetOutlineColor(r, g, b: GLfloat; a: GLfloat = 1.0);
-
- {** @see TGlyphCache.FlushCache *}
- procedure FlushCache(KeepBaseSet: boolean);
-
- {** Outset size *}
- property Outset: single read GetOutset;
- end;
-
-{$IFDEF BITMAP_FONT}
-
- {**
- * A bitmapped font loads it's glyphs from a bitmap and stores them in a
- * texture. Unicode characters are not supported (but could be by supporting
- * multiple textures each storing a subset of unicode glyphs).
- * For backward compatibility only.
- *}
- TBitmapFont = class(TFont)
- private
- fTex: TTexture;
- fTexSize: integer;
- fBaseline: integer;
- fAscender: integer;
- fDescender: integer;
- fWidths: array[0..255] of byte; // half widths
- fOutline: integer;
- fTempColor: TGLColor; ///< colours for the reflection
-
- procedure ResetIntern();
-
- procedure RenderChar(ch: WideChar; var AdvanceX: real);
-
- {**
- * Load font widths from an info file.
- * @param InfoFile: the name of the info (.dat) file
- * @raises Exception if the file is corrupted
- *}
- procedure LoadFontInfo(const InfoFile: string);
-
- protected
- procedure Render(const Text: WideString); override;
- function BBox(const Text: TWideStringArray; Advance: boolean): TBoundsDbl; override;
-
- function GetHeight(): single; override;
- function GetAscender(): single; override;
- function GetDescender(): single; override;
- function GetUnderlinePosition(): single; override;
- function GetUnderlineThickness(): single; override;
-
- public
- {**
- * Creates a bitmapped font from image Filename and font width info
- * loaded from the corresponding file with ending .dat.
- * @param Baseline: y-coord of the baseline given in cartesian coords
- * (y-axis up) and from the lower edge of the glyphs bounding box
- * @param Ascender: pixels from baseline to top of highest glyph
- *}
- constructor Create(const Filename: string; Outline: integer;
- Baseline, Ascender, Descender: integer);
- destructor Destroy(); override;
-
- {**
- * Corrects font widths provided by the info file.
- * NewWidth := Width * WidthMult + WidthAdd
- *}
- procedure CorrectWidths(WidthMult: real; WidthAdd: integer);
-
- {** @see TFont.Reset *}
- procedure Reset(); override;
- end;
-
-{$ENDIF BITMAP_FONT}
-
- TFreeType = class
- public
- {**
- * Returns a pointer to the freetype library singleton.
- * If non exists, freetype will be initialized.
- * @raises Exception if initialization failed
- *}
- class function GetLibrary(): FT_Library;
- class procedure FreeLibrary();
- end;
-
-
-implementation
-
-uses Types;
-
-const
- // shear factor used for the italic effect (bigger value -> more bending)
- cShearFactor = 0.25;
- cShearMatrix: array[0..15] of GLfloat = (
- 1, 0, 0, 0,
- cShearFactor, 1, 0, 0,
- 0, 0, 1, 0,
- 0, 0, 0, 1
- );
- cShearMatrixInv: array[0..15] of GLfloat = (
- 1, 0, 0, 0,
- -cShearFactor, 1, 0, 0,
- 0, 0, 1, 0,
- 0, 0, 0, 1
- );
-
-var
- LibraryInst: FT_Library;
-
-function NewGLColor(r, g, b, a: GLfloat): TGLColor;
-begin
- Result.r := r;
- Result.g := g;
- Result.b := b;
- Result.a := a;
-end;
-
-{**
- * Returns the first power of 2 >= Value.
- *}
-function NextPowerOf2(Value: integer): integer; {$IFDEF HasInline}inline;{$ENDIF}
-begin
- Result := 1;
- while (Result < Value) do
- Result := Result shl 1;
-end;
-
-
-{*
- * TFont
- *}
-
-constructor TFont.Create();
-begin
- inherited;
- ResetIntern();
-end;
-
-destructor TFont.Destroy();
-begin
- inherited;
-end;
-
-procedure TFont.ResetIntern();
-begin
- fStyle := [];
- fUseKerning := true;
- fGlyphSpacing := 0.0;
- fReflectionPass := false;
-
- // must be set by subclasses
- fLineSpacing := 0.0;
- fReflectionSpacing := 0.0;
-end;
-
-procedure TFont.Reset();
-begin
- ResetIntern();
-end;
-
-procedure TFont.SplitLines(const Text: UTF8String; var Lines: TWideStringArray);
-var
- LineList: TStringList;
- LineIndex: integer;
-begin
- // split lines on newline (there is no WideString version of ExtractStrings)
- LineList := TStringList.Create();
- ExtractStrings([#13], [], PChar(Text), LineList);
-
- // create an array of WideStrins from the UTF-8 string-list
- SetLength(Lines, LineList.Count);
- for LineIndex := 0 to LineList.Count-1 do
- Lines[LineIndex] := UTF8Decode(LineList[LineIndex]);
- LineList.Free();
-end;
-
-function TFont.BBox(const Text: UTF8String; Advance: boolean): TBoundsDbl;
-var
- LineArray: TWideStringArray;
-begin
- SplitLines(Text, LineArray);
- Result := BBox(LineArray, Advance);
- SetLength(LineArray, 0);
-end;
-
-function TFont.BBox(const Text: WideString; Advance: boolean): TBoundsDbl;
-begin
- Result := BBox(UTF8Encode(Text), Advance);
-end;
-
-procedure TFont.Print(const Text: TWideStringArray);
-var
- LineIndex: integer;
-begin
- // recursively call this function to draw reflected text
- if ((Reflect in Style) and not ReflectionPass) then
- begin
- ReflectionPass := true;
- Print(Text);
- ReflectionPass := false;
- end;
-
- // store current color, enable-flags, matrix-mode
- glPushAttrib(GL_CURRENT_BIT or GL_ENABLE_BIT or GL_TRANSFORM_BIT);
-
- // set OpenGL state
- glMatrixMode(GL_MODELVIEW);
- glDisable(GL_DEPTH_TEST);
- glEnable(GL_BLEND);
- glEnable(GL_TEXTURE_2D);
- glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
-
- {
- // TODO: just draw texels with alpha > 0 to avoid setting z-buffer for them?
- glAlphaFunc(GL_GREATER, 0);
- glEnable(GL_ALPHA_TEST);
-
- //TODO: Do we need depth-testing?
- if (ReflectionPass) then
- begin
- glDepthMask(0);
- glEnable(GL_DEPTH_TEST);
- end;
- }
-
- {$IFDEF FLIP_YAXIS}
- glPushMatrix();
- glScalef(1, -1, 1);
- {$ENDIF}
-
- // display text
- for LineIndex := 0 to High(Text) do
- begin
- glPushMatrix();
-
- // move to baseline
- glTranslatef(0, -LineSpacing*LineIndex, 0);
-
- if ((Underline in Style) and not ReflectionPass) then
- begin
- glDisable(GL_TEXTURE_2D);
- DrawUnderline(Text[LineIndex]);
- glEnable(GL_TEXTURE_2D);
- end;
-
- // draw reflection
- if (ReflectionPass) then
- begin
- // set reflection spacing
- glTranslatef(0, -ReflectionSpacing, 0);
- // flip y-axis
- glScalef(1, -1, 1);
- end;
-
- // shear for italic effect
- if (Italic in Style) then
- glMultMatrixf(@cShearMatrix);
-
- // render text line
- Render(Text[LineIndex]);
-
- glPopMatrix();
- end;
-
- // restore settings
- {$IFDEF FLIP_YAXIS}
- glPopMatrix();
- {$ENDIF}
- glPopAttrib();
-end;
-
-procedure TFont.Print(const Text: string);
-var
- LineArray: TWideStringArray;
-begin
- SplitLines(Text, LineArray);
- Print(LineArray);
- SetLength(LineArray, 0);
-end;
-
-procedure TFont.Print(const Text: WideString);
-begin
- Print(UTF8Encode(Text));
-end;
-
-procedure TFont.DrawUnderline(const Text: WideString);
-var
- UnderlineY1, UnderlineY2: single;
- Bounds: TBoundsDbl;
-begin
- UnderlineY1 := GetUnderlinePosition();
- UnderlineY2 := UnderlineY1 + GetUnderlineThickness();
- Bounds := BBox(Text);
- glRectf(Bounds.Left, UnderlineY1, Bounds.Right, UnderlineY2);
-end;
-
-procedure TFont.SetStyle(Style: TFontStyle);
-begin
- fStyle := Style;
-end;
-
-function TFont.GetStyle(): TFontStyle;
-begin
- Result := fStyle;
-end;
-
-procedure TFont.SetLineSpacing(Spacing: single);
-begin
- fLineSpacing := Spacing;
-end;
-
-function TFont.GetLineSpacing(): single;
-begin
- Result := fLineSpacing;
-end;
-
-procedure TFont.SetGlyphSpacing(Spacing: single);
-begin
- fGlyphSpacing := Spacing;
-end;
-
-function TFont.GetGlyphSpacing(): single;
-begin
- Result := fGlyphSpacing;
-end;
-
-procedure TFont.SetReflectionSpacing(Spacing: single);
-begin
- fReflectionSpacing := Spacing;
-end;
-
-function TFont.GetReflectionSpacing(): single;
-begin
- Result := fReflectionSpacing;
-end;
-
-procedure TFont.SetUseKerning(Enable: boolean);
-begin
- fUseKerning := Enable;
-end;
-
-function TFont.GetUseKerning(): boolean;
-begin
- Result := fUseKerning;
-end;
-
-procedure TFont.SetReflectionPass(Enable: boolean);
-begin
- fReflectionPass := Enable;
-end;
-
-
-{*
- * TScalableFont
- *}
-
-constructor TScalableFont.Create(Font: TFont; UseMipmaps: boolean);
-var
- MipmapLevel: integer;
-begin
- inherited Create();
-
- fBaseFont := Font;
- fMipmapFonts[0] := Font;
- fUseMipmaps := UseMipmaps;
- ResetIntern();
-
- // create mipmap fonts if requested
- if (UseMipmaps) then
- begin
- for MipmapLevel := 1 to cMaxMipmapLevel do
- begin
- fMipmapFonts[MipmapLevel] := CreateMipmap(MipmapLevel, 1/(1 shl MipmapLevel));
- // stop if no smaller mipmap font is returned
- if (fMipmapFonts[MipmapLevel] = nil) then
- Break;
- end;
- end;
-end;
-
-destructor TScalableFont.Destroy();
-var
- Level: integer;
-begin
- for Level := 0 to High(fMipmapFonts) do
- fMipmapFonts[Level].Free;
- inherited;
-end;
-
-procedure TScalableFont.ResetIntern();
-begin
- fScale := 1.0;
- fAspect := 1.0;
-end;
-
-procedure TScalableFont.Reset();
-var
- Level: integer;
-begin
- inherited;
- ResetIntern();
- for Level := 0 to High(fMipmapFonts) do
- if (fMipmapFonts[Level] <> nil) then
- fMipmapFonts[Level].Reset();
-end;
-
-{**
- * Returns the mipmap level to use with regard to the current projection
- * and modelview matrix, font scale and aspect.
- *
- * Note:
- * - for Freetype fonts, hinting and grid-fitting must be disabled, otherwise
- * the glyph widths/heights ratios and advance widths of the mipmap fonts
- * do not match as they are adjusted sligthly (e.g. an 'a' at size 12px has
- * width 12px, but at size 6px width 8px).
- * - returned mipmap-level is used for all glyphs of the current text to print.
- * This is faster, much easier to handle, since we just need to create
- * multiple sized fonts and select the one we need for the mipmap-level and
- * it avoids that neighbored glyphs use different mipmap-level which might
- * look odd because one glyph might look blurry and the other sharp.
- *
- * Motivation:
- * We do not use OpenGL for mipmapping as the results are very bad. At least
- * with automatic mipmap generation (gluBuildMipmaps) the fonts look rather
- * blurry.
- * Defining our own mipmaps by creating multiple textures with
- * for different mimap levels is a pain, as the font size passed to freetype
- * is not the size of the bitmaps created and it does not guarantee that a
- * glyph bitmap of a font with font-size s/2 is half the size of the font with
- * font-size s. If the bitmap size is just a single pixel bigger than the half
- * we might need a texture of the next power-of-2 and the texture would not be
- * half of the size of the next bigger mipmap. In addition we use a fixed one
- * pixel sized border to smooth the texture (see cTexSmoothBorder) and maybe
- * an outset that is added to the font, so creating a glyph mipmap that is
- * exactly half the size of the next bigger one is a very difficult task.
- *
- * Solution:
- * Use mipmap textures that are not exactly half the size of the next mipmap
- * level. OpenGL does not support this (at least not without extensions).
- * The trickiest task is to determine the mipmap to use by calculating the
- * amount of minification that is performed in this function.
- *}
-function TScalableFont.GetMipmapLevel(): integer;
-var
- ModelMatrix, ProjMatrix: T16dArray;
- WinCoords: array[0..2, 0..2] of GLdouble;
- ViewPortArray: TViewPortArray;
- Dist, Dist2: double;
- WidthScale, HeightScale: double;
-const
- // width/height of square used for determining the scale
- cTestSize = 10.0;
- // an offset to the mipmap-level to adjust the change-over of two consecutive
- // mipmap levels. If for example the bias is 0.1 and unbiased level is 1.9
- // the result level will be 2. A bias of 0.5 is equal to rounding.
- // With bias=0.1 we prefer larger mipmaps over smaller ones.
- cBias = 0.2;
-begin
- // 1. retrieve current transformation matrices for gluProject
- glGetDoublev(GL_MODELVIEW_MATRIX, @ModelMatrix);
- glGetDoublev(GL_PROJECTION_MATRIX, @ProjMatrix);
- glGetIntegerv(GL_VIEWPORT, @ViewPortArray);
-
- // 2. project three of the corner points of a square with size cTestSize
- // to window coordinates (the square is just a dummy for a glyph)
-
- // project point (x1, y1) to window corrdinates
- gluProject(0, 0, 0,
- ModelMatrix, ProjMatrix, ViewPortArray,
- @WinCoords[0][0], @WinCoords[0][1], @WinCoords[0][2]);
- // project point (x2, y1) to window corrdinates
- gluProject(cTestSize, 0, 0,
- ModelMatrix, ProjMatrix, ViewPortArray,
- @WinCoords[1][0], @WinCoords[1][1], @WinCoords[1][2]);
- // project point (x1, y2) to window corrdinates
- gluProject(0, cTestSize, 0,
- ModelMatrix, ProjMatrix, ViewPortArray,
- @WinCoords[2][0], @WinCoords[2][1], @WinCoords[2][2]);
-
- // 3. Lets see how much the width and height of the square changed.
- // Calculate the width and height as displayed on the screen in window
- // coordinates and calculate the ratio to the original coordinates in
- // modelview space so the ratio gives us the scale (minification here).
-
- // projected width ||(x1, y1) - (x2, y1)||
- Dist := (WinCoords[0][0] - WinCoords[1][0]);
- Dist2 := (WinCoords[0][1] - WinCoords[1][1]);
- WidthScale := cTestSize / Sqrt(Dist*Dist + Dist2*Dist2);
-
- // projected height ||(x1, y1) - (x1, y2)||
- Dist := (WinCoords[0][0] - WinCoords[2][0]);
- Dist2 := (WinCoords[0][1] - WinCoords[2][1]);
- HeightScale := cTestSize / Sqrt(Dist*Dist + Dist2*Dist2);
-
- //writeln(Format('Scale %f, %f', [WidthScale, HeightScale]));
-
- // 4. Now that we have got the scale, take the bigger minification scale
- // and get it to a logarithmic scale as each mipmap is 1/2 the size of its
- // predecessor (Mipmap_size[i] = Mipmap_size[i-1]/2).
- // The result is our mipmap-level = the index of the mipmap to use.
-
- // Level > 0: Minification; < 0: Magnification
- Result := Trunc(Log2(Max(WidthScale, HeightScale)) + cBias);
-
- // clamp to valid range
- if (Result < 0) then
- Result := 0;
- if (Result > High(fMipmapFonts)) then
- Result := High(fMipmapFonts);
-end;
-
-function TScalableFont.GetMipmapScale(Level: integer): single;
-begin
- if (fMipmapFonts[Level] = nil) then
- begin
- Result := -1;
- Exit;
- end;
-
- Result := fScale * fMipmapFonts[0].Height / fMipmapFonts[Level].Height;
-end;
-
-{**
- * Returns the correct mipmap font for the current scale and projection
- * matrix. The modelview scale is adjusted to the mipmap level, so
- * Result.Print() will display the font in the correct size.
- *}
-function TScalableFont.ChooseMipmapFont(): TFont;
-var
- DesiredLevel: integer;
- Level: integer;
- MipmapScale: single;
-begin
- Result := nil;
- DesiredLevel := GetMipmapLevel();
-
- // get the smallest mipmap available for the desired level
- // as not all levels must be assigned to a font.
- for Level := DesiredLevel downto 0 do
- begin
- if (fMipmapFonts[Level] <> nil) then
- begin
- Result := fMipmapFonts[Level];
- Break;
- end;
- end;
-
- // since the mipmap font (if level > 0) is smaller than the base-font
- // we have to scale to get its size right.
- MipmapScale := fMipmapFonts[0].Height/Result.Height;
- glScalef(MipmapScale, MipmapScale, 0);
-end;
-
-procedure TScalableFont.Print(const Text: TWideStringArray);
-begin
- glPushMatrix();
- glScalef(fScale * fAspect, fScale, 0);
- if (fUseMipmaps) then
- ChooseMipmapFont().Print(Text)
- else
- fBaseFont.Print(Text);
- glPopMatrix();
-end;
-
-procedure TScalableFont.Render(const Text: WideString);
-begin
- Assert(false, 'Unused TScalableFont.Render() was called');
-end;
-
-function TScalableFont.BBox(const Text: TWideStringArray; Advance: boolean): TBoundsDbl;
-begin
- Result := fBaseFont.BBox(Text, Advance);
- Result.Left := Result.Left * fScale;
- Result.Right := Result.Right * fScale;
- Result.Top := Result.Top * fScale;
- Result.Bottom := Result.Bottom * fScale;
-end;
-
-procedure TScalableFont.SetHeight(Height: single);
-begin
- fScale := Height / fBaseFont.GetHeight();
-end;
-
-function TScalableFont.GetHeight(): single;
-begin
- Result := fBaseFont.GetHeight() * fScale;
-end;
-
-procedure TScalableFont.SetAspect(Aspect: single);
-begin
- fAspect := Aspect;
-end;
-
-function TScalableFont.GetAspect(): single;
-begin
- Result := fAspect;
-end;
-
-function TScalableFont.GetAscender(): single;
-begin
- Result := fBaseFont.GetAscender() * fScale;
-end;
-
-function TScalableFont.GetDescender(): single;
-begin
- Result := fBaseFont.GetDescender() * fScale;
-end;
-
-procedure TScalableFont.SetLineSpacing(Spacing: single);
-var
- Level: integer;
-begin
- for Level := 0 to High(fMipmapFonts) do
- if (fMipmapFonts[Level] <> nil) then
- fMipmapFonts[Level].SetLineSpacing(Spacing / GetMipmapScale(Level));
-end;
-
-function TScalableFont.GetLineSpacing(): single;
-begin
- Result := fBaseFont.GetLineSpacing() * fScale;
-end;
-
-procedure TScalableFont.SetGlyphSpacing(Spacing: single);
-var
- Level: integer;
-begin
- for Level := 0 to High(fMipmapFonts) do
- if (fMipmapFonts[Level] <> nil) then
- fMipmapFonts[Level].SetGlyphSpacing(Spacing / GetMipmapScale(Level));
-end;
-
-function TScalableFont.GetGlyphSpacing(): single;
-begin
- Result := fBaseFont.GetGlyphSpacing() * fScale;
-end;
-
-procedure TScalableFont.SetReflectionSpacing(Spacing: single);
-var
- Level: integer;
-begin
- for Level := 0 to High(fMipmapFonts) do
- if (fMipmapFonts[Level] <> nil) then
- fMipmapFonts[Level].SetReflectionSpacing(Spacing / GetMipmapScale(Level));
-end;
-
-function TScalableFont.GetReflectionSpacing(): single;
-begin
- Result := fBaseFont.GetLineSpacing() * fScale;
-end;
-
-procedure TScalableFont.SetStyle(Style: TFontStyle);
-var
- Level: integer;
-begin
- for Level := 0 to High(fMipmapFonts) do
- if (fMipmapFonts[Level] <> nil) then
- fMipmapFonts[Level].SetStyle(Style);
-end;
-
-function TScalableFont.GetStyle(): TFontStyle;
-begin
- Result := fBaseFont.GetStyle();
-end;
-
-function TScalableFont.GetUnderlinePosition(): single;
-begin
- Result := fBaseFont.GetUnderlinePosition();
-end;
-
-function TScalableFont.GetUnderlineThickness(): single;
-begin
- Result := fBaseFont.GetUnderlinePosition();
-end;
-
-procedure TScalableFont.SetUseKerning(Enable: boolean);
-var
- Level: integer;
-begin
- for Level := 0 to High(fMipmapFonts) do
- if (fMipmapFonts[Level] <> nil) then
- fMipmapFonts[Level].SetUseKerning(Enable);
-end;
-
-
-{*
- * TCachedFont
- *}
-
-constructor TCachedFont.Create();
-begin
- inherited;
- fCache := TGlyphCache.Create();
-end;
-
-destructor TCachedFont.Destroy();
-begin
- fCache.Free;
- inherited;
-end;
-
-function TCachedFont.GetGlyph(ch: WideChar): TGlyph;
-begin
- Result := fCache.GetGlyph(ch);
- if (Result = nil) then
- begin
- Result := LoadGlyph(ch);
- if (not fCache.AddGlyph(ch, Result)) then
- Result.Free;
- end;
-end;
-
-procedure TCachedFont.FlushCache(KeepBaseSet: boolean);
-begin
- fCache.FlushCache(KeepBaseSet);
-end;
-
-
-{*
- * TFTFont
- *}
-
-constructor TFTFont.Create(
- const Filename: string;
- Size: integer; Outset: single;
- LoadFlags: FT_Int32);
-var
- i: WideChar;
-begin
- inherited Create();
-
- fFilename := Filename;
- fSize := Size;
- fOutset := Outset;
- fLoadFlags := LoadFlags;
- fUseDisplayLists := true;
-
- // load font information
- if (FT_New_Face(TFreeType.GetLibrary(), PChar(Filename), 0, fFace) <> 0) then
- raise Exception.Create('FT_New_Face: Could not load font ''' + Filename + '''');
-
- // support scalable fonts only
- if (not FT_IS_SCALABLE(fFace)) then
- raise Exception.Create('Font is not scalable');
-
- if (FT_Set_Pixel_Sizes(fFace, 0, Size) <> 0) then
- raise Exception.Create('FT_Set_Pixel_Sizes failes');
-
- // get scale factor for font-unit to pixel-size transformation
- fFontUnitScale.X := fFace.size.metrics.x_ppem / fFace.units_per_EM;
- fFontUnitScale.Y := fFace.size.metrics.y_ppem / fFace.units_per_EM;
-
- ResetIntern();
-
- // pre-cache some commonly used glyphs (' ' - '~')
- for i := #32 to #126 do
- fCache.AddGlyph(i, TFTGlyph.Create(Self, i, Outset, LoadFlags));
-end;
-
-destructor TFTFont.Destroy();
-begin
- // free face
- FT_Done_Face(fFace);
- inherited;
-end;
-
-procedure TFTFont.ResetIntern();
-begin
- // Note: outset and non outset fonts use same spacing
- fLineSpacing := fFace.height * fFontUnitScale.Y;
- fReflectionSpacing := -2*fFace.descender * fFontUnitScale.Y;
-end;
-
-procedure TFTFont.Reset();
-begin
- inherited;
- ResetIntern();
-end;
-
-function TFTFont.LoadGlyph(ch: WideChar): TGlyph;
-begin
- Result := TFTGlyph.Create(Self, ch, Outset, fLoadFlags);
-end;
-
-function TFTFont.BBox(const Text: TWideStringArray; Advance: boolean): TBoundsDbl;
-var
- Glyph, PrevGlyph: TFTGlyph;
- TextLine: WideString;
- LineYOffset: single;
- LineIndex, CharIndex: integer;
- LineBounds: TBoundsDbl;
- KernDelta: FT_Vector;
- UnderlinePos: double;
-begin
- // Reset global bounds
- Result.Left := Infinity;
- Result.Right := 0;
- Result.Bottom := Infinity;
- Result.Top := 0;
-
- // reset last glyph
- PrevGlyph := nil;
-
- // display text
- for LineIndex := 0 to High(Text) do
- begin
- // get next text line
- TextLine := Text[LineIndex];
- LineYOffset := -LineSpacing * LineIndex;
-
- // reset line bounds
- LineBounds.Left := Infinity;
- LineBounds.Right := 0;
- LineBounds.Bottom := Infinity;
- LineBounds.Top := 0;
-
- // for each glyph image, compute its bounding box
- for CharIndex := 1 to Length(TextLine) do
- begin
- Glyph := TFTGlyph(GetGlyph(TextLine[CharIndex]));
- if (Glyph <> nil) then
- begin
- // get kerning
- if (fUseKerning and FT_HAS_KERNING(fFace) and (PrevGlyph <> nil)) then
- begin
- FT_Get_Kerning(fFace, PrevGlyph.CharIndex, Glyph.CharIndex,
- FT_KERNING_UNSCALED, KernDelta);
- LineBounds.Right := LineBounds.Right + KernDelta.x * fFontUnitScale.X;
- end;
-
- // update left bound (must be done before right bound is updated)
- if (LineBounds.Right + Glyph.Bounds.Left < LineBounds.Left) then
- LineBounds.Left := LineBounds.Right + Glyph.Bounds.Left;
-
- // update right bound
- if (CharIndex < Length(TextLine)) or // not the last character
- (TextLine[CharIndex] = ' ') or // on space char (Bounds.Right = 0)
- Advance then // or in advance mode
- begin
- // add advance and glyph spacing
- LineBounds.Right := LineBounds.Right + Glyph.Advance.x + GlyphSpacing
- end
- else
- begin
- // add glyph's right bound
- LineBounds.Right := LineBounds.Right + Glyph.Bounds.Right;
- end;
-
- // update bottom and top bounds
- if (Glyph.Bounds.Bottom < LineBounds.Bottom) then
- LineBounds.Bottom := Glyph.Bounds.Bottom;
- if (Glyph.Bounds.Top > LineBounds.Top) then
- LineBounds.Top := Glyph.Bounds.Top;
- end;
-
- PrevGlyph := Glyph;
- end;
-
- // handle italic font style
- if (Italic in Style) then
- begin
- LineBounds.Left := LineBounds.Left + LineBounds.Bottom * cShearFactor;
- LineBounds.Right := LineBounds.Right + LineBounds.Top * cShearFactor;
- end;
-
- // handle underlined font style
- if (Underline in Style) then
- begin
- UnderlinePos := GetUnderlinePosition();
- if (UnderlinePos < LineBounds.Bottom) then
- LineBounds.Bottom := UnderlinePos;
- end;
-
- // add line offset
- LineBounds.Bottom := LineBounds.Bottom + LineYOffset;
- LineBounds.Top := LineBounds.Top + LineYOffset;
-
- // adjust global bounds
- if (Result.Left > LineBounds.Left) then
- Result.Left := LineBounds.Left;
- if (Result.Right < LineBounds.Right) then
- Result.Right := LineBounds.Right;
- if (Result.Bottom > LineBounds.Bottom) then
- Result.Bottom := LineBounds.Bottom;
- if (Result.Top < LineBounds.Top) then
- Result.Top := LineBounds.Top;
- end;
-
- // if left or bottom bound was not set, set them to 0
- if (Result.Left = Infinity) then
- Result.Left := 0.0;
- if (Result.Bottom = Infinity) then
- Result.Bottom := 0.0;
-end;
-
-procedure TFTFont.Render(const Text: WideString);
-var
- CharIndex: integer;
- Glyph, PrevGlyph: TFTGlyph;
- KernDelta: FT_Vector;
-begin
- // reset last glyph
- PrevGlyph := nil;
-
- // draw current line
- for CharIndex := 1 to Length(Text) do
- begin
- Glyph := TFTGlyph(GetGlyph(Text[CharIndex]));
- if (Assigned(Glyph)) then
- begin
- // get kerning
- if (fUseKerning and FT_HAS_KERNING(fFace) and (PrevGlyph <> nil)) then
- begin
- FT_Get_Kerning(fFace, PrevGlyph.CharIndex, Glyph.CharIndex,
- FT_KERNING_UNSCALED, KernDelta);
- glTranslatef(KernDelta.x * fFontUnitScale.X, 0, 0);
- end;
-
- if (ReflectionPass) then
- Glyph.RenderReflection()
- else
- Glyph.Render(fUseDisplayLists);
-
- glTranslatef(Glyph.Advance.x + fGlyphSpacing, 0, 0);
- end;
-
- PrevGlyph := Glyph;
- end;
-end;
-
-function TFTFont.GetHeight(): single;
-begin
- Result := Ascender - Descender;
-end;
-
-function TFTFont.GetAscender(): single;
-begin
- Result := fFace.ascender * fFontUnitScale.Y + Outset*2;
-end;
-
-function TFTFont.GetDescender(): single;
-begin
- // Note: outset is not part of the descender as the baseline is lifted
- Result := fFace.descender * fFontUnitScale.Y;
-end;
-
-function TFTFont.GetUnderlinePosition(): single;
-begin
- Result := fFace.underline_position * fFontUnitScale.Y - Outset;
-end;
-
-function TFTFont.GetUnderlineThickness(): single;
-begin
- Result := fFace.underline_thickness * fFontUnitScale.Y + Outset*2;
-end;
-
-
-{*
- * TFTScalableFont
- *}
-
-constructor TFTScalableFont.Create(const Filename: string;
- Size: integer; OutsetAmount: single;
- UseMipmaps: boolean);
-var
- LoadFlags: FT_Int32;
-begin
- LoadFlags := FT_LOAD_DEFAULT;
- // Disable hinting and grid-fitting to preserve font outlines at each font
- // size, otherwise the font widths/heights do not match resulting in ugly
- // text size changes during zooming.
- // A drawback is a reduced quality with smaller font sizes but it is not that
- // bad with gray-scaled rendering (at least it looks better than OpenGL's
- // linear downscaling on minification).
- if (UseMipmaps) then
- LoadFlags := LoadFlags or FT_LOAD_NO_HINTING;
- inherited Create(
- TFTFont.Create(Filename, Size, Size * OutsetAmount, LoadFlags),
- UseMipmaps);
-end;
-
-function TFTScalableFont.CreateMipmap(Level: integer; Scale: single): TFont;
-var
- ScaledSize: integer;
- BaseFont: TFTFont;
-begin
- Result := nil;
- BaseFont := TFTFont(fBaseFont);
- ScaledSize := Round(BaseFont.Size * Scale);
- // do not create mipmap fonts < 8 pixels
- if (ScaledSize < 8) then
- Exit;
- Result := TFTFont.Create(BaseFont.fFilename,
- ScaledSize, BaseFont.fOutset * Scale,
- FT_LOAD_DEFAULT or FT_LOAD_NO_HINTING);
-end;
-
-function TFTScalableFont.GetOutset(): single;
-begin
- Result := TFTFont(fBaseFont).Outset * fScale;
-end;
-
-procedure TFTScalableFont.FlushCache(KeepBaseSet: boolean);
-var
- Level: integer;
-begin
- for Level := 0 to High(fMipmapFonts) do
- if (fMipmapFonts[Level] <> nil) then
- TFTFont(fMipmapFonts[Level]).FlushCache(KeepBaseSet);
-end;
-
-
-{*
- * TOutlineFont
- *}
-
-constructor TFTOutlineFont.Create(
- const Filename: string;
- Size: integer; Outset: single;
- LoadFlags: FT_Int32);
-begin
- inherited Create();
-
- fFilename := Filename;
- fSize := Size;
- fOutset := Outset;
-
- fInnerFont := TFTFont.Create(Filename, Size, 0.0, LoadFlags);
- fOutlineFont := TFTFont.Create(Filename, Size, Outset, LoadFlags);
-
- ResetIntern();
-end;
-
-destructor TFTOutlineFont.Destroy;
-begin
- fOutlineFont.Free;
- fInnerFont.Free;
- inherited;
-end;
-
-procedure TFTOutlineFont.ResetIntern();
-begin
- // TODO: maybe swap fInnerFont/fOutlineFont.GlyphSpacing to use the spacing
- // of the outline font?
- //fInnerFont.GlyphSpacing := fOutset*2;
- fOutlineFont.GlyphSpacing := -fOutset*2;
-
- fLineSpacing := fOutlineFont.LineSpacing;
- fReflectionSpacing := fOutlineFont.ReflectionSpacing;
- fOutlineColor := NewGLColor(0, 0, 0, 1);
-end;
-
-procedure TFTOutlineFont.Reset();
-begin
- inherited;
- fInnerFont.Reset();
- fOutlineFont.Reset();
- ResetIntern();
-end;
-
-procedure TFTOutlineFont.DrawUnderline(const Text: WideString);
-begin
- glPushAttrib(GL_CURRENT_BIT);
- glColor4fv(@fOutlineColor.vals);
- fOutlineFont.DrawUnderline(Text);
- glPopAttrib();
-
- glPushMatrix();
- glTranslatef(fOutset, 0, 0);
- fInnerFont.DrawUnderline(Text);
- glPopMatrix();
-end;
-
-procedure TFTOutlineFont.Render(const Text: WideString);
-begin
- { setup and render outline font }
-
- // save old color
- glPushAttrib(GL_CURRENT_BIT);
- glColor4fv(@fOutlineColor.vals);
- glPushMatrix();
- fOutlineFont.Render(Text);
- glPopMatrix();
- glPopAttrib();
-
- { setup and render inner font }
-
- glPushMatrix();
- glTranslatef(fOutset, fOutset, 0);
- fInnerFont.Render(Text);
- glPopMatrix();
-end;
-
-procedure TFTOutlineFont.SetOutlineColor(r, g, b: GLfloat; a: GLfloat);
-begin
- fOutlineColor := NewGLColor(r, g, b, a);
-end;
-
-procedure TFTOutlineFont.FlushCache(KeepBaseSet: boolean);
-begin
- fOutlineFont.FlushCache(KeepBaseSet);
- fInnerFont.FlushCache(KeepBaseSet);
-end;
-
-function TFTOutlineFont.BBox(const Text: TWideStringArray; Advance: boolean): TBoundsDbl;
-begin
- Result := fOutlineFont.BBox(Text, Advance);
-end;
-
-function TFTOutlineFont.GetHeight(): single;
-begin
- Result := fOutlineFont.Height;
-end;
-
-function TFTOutlineFont.GetAscender(): single;
-begin
- Result := fOutlineFont.Ascender;
-end;
-
-function TFTOutlineFont.GetDescender(): single;
-begin
- Result := fOutlineFont.Descender;
-end;
-
-procedure TFTOutlineFont.SetLineSpacing(Spacing: single);
-begin
- inherited SetLineSpacing(Spacing);
- fInnerFont.LineSpacing := Spacing;
- fOutlineFont.LineSpacing := Spacing;
-end;
-
-procedure TFTOutlineFont.SetGlyphSpacing(Spacing: single);
-begin
- inherited SetGlyphSpacing(Spacing);
- fInnerFont.GlyphSpacing := Spacing;
- fOutlineFont.GlyphSpacing := Spacing - Outset*2;
-end;
-
-procedure TFTOutlineFont.SetReflectionSpacing(Spacing: single);
-begin
- inherited SetReflectionSpacing(Spacing);
- fInnerFont.ReflectionSpacing := Spacing;
- fOutlineFont.ReflectionSpacing := Spacing;
-end;
-
-procedure TFTOutlineFont.SetStyle(Style: TFontStyle);
-begin
- inherited SetStyle(Style);
- fInnerFont.Style := Style;
- fOutlineFont.Style := Style;
-end;
-
-function TFTOutlineFont.GetStyle(): TFontStyle;
-begin
- Result := inherited GetStyle();
-end;
-
-function TFTOutlineFont.GetUnderlinePosition(): single;
-begin
- Result := fOutlineFont.GetUnderlinePosition();
-end;
-
-function TFTOutlineFont.GetUnderlineThickness(): single;
-begin
- Result := fOutlineFont.GetUnderlinePosition();
-end;
-
-procedure TFTOutlineFont.SetUseKerning(Enable: boolean);
-begin
- inherited SetUseKerning(Enable);
- fInnerFont.fUseKerning := Enable;
- fOutlineFont.fUseKerning := Enable;
-end;
-
-procedure TFTOutlineFont.SetReflectionPass(Enable: boolean);
-begin
- inherited SetReflectionPass(Enable);
- fInnerFont.fReflectionPass := Enable;
- fOutlineFont.fReflectionPass := Enable;
-end;
-
-{**
- * TScalableOutlineFont
- *}
-
-constructor TFTScalableOutlineFont.Create(
- const Filename: string;
- Size: integer; OutsetAmount: single;
- UseMipmaps: boolean);
-var
- LoadFlags: FT_Int32;
-begin
- LoadFlags := FT_LOAD_DEFAULT;
- // Disable hinting and grid-fitting (see TFTScalableFont.Create)
- if (UseMipmaps) then
- LoadFlags := LoadFlags or FT_LOAD_NO_HINTING;
- inherited Create(
- TFTOutlineFont.Create(Filename, Size, Size*OutsetAmount, LoadFlags),
- UseMipmaps);
-end;
-
-function TFTScalableOutlineFont.CreateMipmap(Level: integer; Scale: single): TFont;
-var
- ScaledSize: integer;
- BaseFont: TFTOutlineFont;
-begin
- Result := nil;
- BaseFont := TFTOutlineFont(fBaseFont);
- ScaledSize := Round(BaseFont.Size*Scale);
- // do not create mipmap fonts < 8 pixels
- if (ScaledSize < 8) then
- Exit;
- Result := TFTOutlineFont.Create(BaseFont.fFilename,
- ScaledSize, BaseFont.fOutset*Scale,
- FT_LOAD_DEFAULT or FT_LOAD_NO_HINTING);
-end;
-
-function TFTScalableOutlineFont.GetOutset(): single;
-begin
- Result := TFTOutlineFont(fBaseFont).Outset * fScale;
-end;
-
-procedure TFTScalableOutlineFont.SetOutlineColor(r, g, b: GLfloat; a: GLfloat);
-var
- Level: integer;
-begin
- for Level := 0 to High(fMipmapFonts) do
- if (fMipmapFonts[Level] <> nil) then
- TFTOutlineFont(fMipmapFonts[Level]).SetOutlineColor(r, g, b, a);
-end;
-
-procedure TFTScalableOutlineFont.FlushCache(KeepBaseSet: boolean);
-var
- Level: integer;
-begin
- for Level := 0 to High(fMipmapFonts) do
- if (fMipmapFonts[Level] <> nil) then
- TFTOutlineFont(fMipmapFonts[Level]).FlushCache(KeepBaseSet);
-end;
-
-
-{*
- * TFTGlyph
- *}
-
-const
- {**
- * Size of the transparent border surrounding the glyph image in the texture.
- * The border is necessary because OpenGL does not smooth texels at the
- * border of a texture with the GL_CLAMP or GL_CLAMP_TO_EDGE styles.
- * Without the border, magnified glyph textures look very ugly at their edges.
- * It looks edgy, as if some pixels are missing especially on the left edge
- * (just set cTexSmoothBorder to 0 to see what is meant by this).
- * With the border even the glyphs edges are blended to the border (transparent)
- * color and everything looks nice.
- *
- * Note:
- * OpenGL already supports texture border by setting the border parameter
- * of glTexImage*D() to 1 and using a texture size of 2^m+2b and setting the
- * border pixels to the border color. In some forums it is discouraged to use
- * the border parameter as only a few of the more modern graphics cards support
- * this feature. On an ATI Radeon 9700 card, the slowed down to 0.5 fps and
- * the glyph's background got black. So instead of using this feature we
- * handle it on our own. The only drawback is that textures might get bigger
- * because the border might require a higher power of 2 size instead of just
- * two additional pixels.
- *}
- cTexSmoothBorder = 1;
-
-procedure TFTGlyph.Extrude(var TexBuffer: TGLubyteDynArray; Outset: single);
-
- procedure SetToMax(var Val1: GLubyte; Val2: GLubyte); {$IFDEF HasInline}inline;{$ENDIF}
- begin
- if (Val1 < Val2) then
- Val1 := Val2;
- end;
-
-var
- I, X, Y: integer;
- SrcBuffer,TmpBuffer: TGLubyteDynArray;
- TexLine, TexLinePrev, TexLineNext: PGLubyteArray;
- SrcLine: PGLubyteArray;
- AlphaScale: single;
- Value, ValueNeigh, ValueDiag: GLubyte;
-const
- // square-root of 2 used for diagonal neighbor pixels
- cSqrt2 = 1.4142;
- // number of ignored pixels on each edge of the bitmap. Consists of:
- // - border used for font smoothing and
- // - outer (extruded) bitmap pixel (because it is just written but never read)
- cBorder = cTexSmoothBorder + 1;
-begin
- // allocate memory for temporary buffer
- SetLength(SrcBuffer, Length(TexBuffer));
- FillChar(SrcBuffer[0], Length(TexBuffer), 0);
-
- // extrude pixel by pixel
- for I := 1 to Ceil(Outset) do
- begin
- // swap arrays
- TmpBuffer := TexBuffer;
- TexBuffer := SrcBuffer;
- SrcBuffer := TmpBuffer;
-
- // as long as we add an entire pixel of outset, use a solid color.
- // If the fractional part is reached blend, e.g. outline=3.2 -> 3 solid
- // pixels and one blended with alpha=0.2.
- // For the fractional part I = Ceil(Outset) is always true.
- if (I <= Outset) then
- AlphaScale := 1
- else
- AlphaScale := Outset - Trunc(Outset);
-
- // copy data to the expanded bitmap.
- for Y := cBorder to fTexSize.Height - 2*cBorder do
- begin
- TexLine := @TexBuffer[Y*fTexSize.Width];
- TexLinePrev := @TexBuffer[(Y-1)*fTexSize.Width];
- TexLineNext := @TexBuffer[(Y+1)*fTexSize.Width];
- SrcLine := @SrcBuffer[Y*fTexSize.Width];
-
- // expand current line's pixels
- for X := cBorder to fTexSize.Width - 2*cBorder do
- begin
- Value := SrcLine[X];
- ValueNeigh := Round(Value * AlphaScale);
- ValueDiag := Round(ValueNeigh / cSqrt2);
-
- SetToMax(TexLine[X], Value);
- SetToMax(TexLine[X-1], ValueNeigh);
- SetToMax(TexLine[X+1], ValueNeigh);
-
- SetToMax(TexLinePrev[X], ValueNeigh);
- SetToMax(TexLinePrev[X-1], ValueDiag);
- SetToMax(TexLinePrev[X+1], ValueDiag);
-
- SetToMax(TexLineNext[X], ValueNeigh);
- SetToMax(TexLineNext[X-1], ValueDiag);
- SetToMax(TexLineNext[X+1], ValueDiag);
- end;
- end;
- end;
-
- TmpBuffer := nil;
- SetLength(SrcBuffer, 0);
-end;
-
-procedure TFTGlyph.CreateTexture(LoadFlags: FT_Int32);
-var
- X, Y: integer;
- Glyph: FT_Glyph;
- BitmapGlyph: FT_BitmapGlyph;
- Bitmap: PFT_Bitmap;
- BitmapLine: PChar;
- BitmapBuffer: PChar;
- TexBuffer: TGLubyteDynArray;
- TexLine: PGLubyteArray;
- CBox: FT_BBox;
-begin
- // load the Glyph for our character
- if (FT_Load_Glyph(fFont.Face, fCharIndex, LoadFlags) <> 0) then
- raise Exception.Create('FT_Load_Glyph failed');
-
- // move the face's glyph into a Glyph object
- if (FT_Get_Glyph(fFont.Face^.glyph, Glyph) <> 0) then
- raise Exception.Create('FT_Get_Glyph failed');
-
- // store scaled advance width/height in glyph-object
- fAdvance.X := fFont.Face^.glyph^.advance.x / 64 + fOutset*2;
- fAdvance.Y := fFont.Face^.glyph^.advance.y / 64 + fOutset*2;
-
- // get the contour's bounding box (in 1/64th pixels, not font-units)
- FT_Glyph_Get_CBox(Glyph, FT_GLYPH_BBOX_UNSCALED, CBox);
- // convert 1/64th values to double values
- fBounds.Left := CBox.xMin / 64;
- fBounds.Right := CBox.xMax / 64 + fOutset*2;
- fBounds.Bottom := CBox.yMin / 64;
- fBounds.Top := CBox.yMax / 64 + fOutset*2;
-
- // convert the glyph to a bitmap (and destroy original glyph image)
- FT_Glyph_To_Bitmap(Glyph, ft_render_mode_normal, nil, 1);
- BitmapGlyph := FT_BitmapGlyph(Glyph);
-
- // get bitmap offsets
- fBitmapCoords.Left := BitmapGlyph^.left - cTexSmoothBorder;
- // Note: add 1*fOutset for lifting the baseline so outset fonts to not intersect
- // with the baseline; Ceil(fOutset) for the outset pixels added to the bitmap.
- fBitmapCoords.Top := BitmapGlyph^.top + fOutset+Ceil(fOutset) + cTexSmoothBorder;
-
- // make accessing the bitmap easier
- Bitmap := @BitmapGlyph^.bitmap;
- // get bitmap dimensions
- fBitmapCoords.Width := Bitmap.width + (Ceil(fOutset) + cTexSmoothBorder)*2;
- fBitmapCoords.Height := Bitmap.rows + (Ceil(fOutset) + cTexSmoothBorder)*2;
-
- // get power-of-2 bitmap widths
- fTexSize.Width :=
- NextPowerOf2(Bitmap.width + (Ceil(fOutset) + cTexSmoothBorder)*2);
- fTexSize.Height :=
- NextPowerOf2(Bitmap.rows + (Ceil(fOutset) + cTexSmoothBorder)*2);
-
- // texture-widths ignoring empty (power-of-2) padding space
- fTexOffset.X := fBitmapCoords.Width / fTexSize.Width;
- fTexOffset.Y := fBitmapCoords.Height / fTexSize.Height;
-
- // allocate memory for texture data
- SetLength(TexBuffer, fTexSize.Width * fTexSize.Height);
- FillChar(TexBuffer[0], Length(TexBuffer), 0);
-
- // Freetype stores the bitmap with either upper (pitch is > 0) or lower
- // (pitch < 0) glyphs line first. Set the buffer to the upper line.
- // See http://freetype.sourceforge.net/freetype2/docs/glyphs/glyphs-7.html
- if (Bitmap.pitch > 0) then
- BitmapBuffer := @Bitmap.buffer[0]
- else
- BitmapBuffer := @Bitmap.buffer[(Bitmap.rows-1) * Abs(Bitmap.pitch)];
-
- // copy data to texture bitmap (upper line first).
- for Y := 0 to Bitmap.rows-1 do
- begin
- // set pointer to first pixel in line that holds bitmap data.
- // Each line starts with a cTexSmoothBorder pixel and multiple outset pixels
- // that are added by Extrude() later.
- TexLine := @TexBuffer[(Y + cTexSmoothBorder + Ceil(fOutset)) * fTexSize.Width +
- cTexSmoothBorder + Ceil(fOutset)];
- // get next lower line offset, use pitch instead of width as it tells
- // us the storage direction of the lines. In addition a line might be padded.
- BitmapLine := @BitmapBuffer[Y * Bitmap.pitch];
- for X := 0 to Bitmap.width-1 do
- TexLine[X] := GLubyte(BitmapLine[X]);
- end;
-
- if (fOutset > 0) then
- Extrude(TexBuffer, fOutset);
-
- // allocate resources for textures and display lists
- glGenTextures(1, @fTexture);
-
- // setup texture paramaters
- glBindTexture(GL_TEXTURE_2D, fTexture);
- glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
- glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
- glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
- glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
-
- glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
- // create alpha-map (GL_ALPHA component only).
- // TexCoord (0,0) corresponds to the top left pixel of the glyph,
- // (1,1) to the bottom right pixel. So the glyph is flipped as OpenGL uses
- // a cartesian (y-axis up) coordinate system for textures.
- // See the cTexSmoothBorder comment for info on texture borders.
- glTexImage2D(GL_TEXTURE_2D, 0, GL_ALPHA, fTexSize.Width, fTexSize.Height,
- 0, GL_ALPHA, GL_UNSIGNED_BYTE, @TexBuffer[0]);
-
- // free expanded data
- SetLength(TexBuffer, 0);
-
- // create the display list
- fDisplayList := glGenLists(1);
-
- // render to display-list
- glNewList(fDisplayList, GL_COMPILE);
- Render(false);
- glEndList();
-
- // free glyph data (bitmap, etc.)
- FT_Done_Glyph(Glyph);
-end;
-
-constructor TFTGlyph.Create(Font: TFTFont; ch: WideChar; Outset: single;
- LoadFlags: FT_Int32);
-begin
- inherited Create();
-
- fFont := Font;
- fOutset := Outset;
-
- // get the Freetype char-index (use default UNICODE charmap)
- fCharIndex := FT_Get_Char_Index(Font.fFace, FT_ULONG(ch));
-
- CreateTexture(LoadFlags);
-end;
-
-destructor TFTGlyph.Destroy;
-begin
- if (fDisplayList <> 0) then
- glDeleteLists(fDisplayList, 1);
- if (fTexture <> 0) then
- glDeleteTextures(1, @fTexture);
- inherited;
-end;
-
-procedure TFTGlyph.Render(UseDisplayLists: boolean);
-begin
- // use display-lists if enabled and exit
- if (UseDisplayLists) then
- begin
- glCallList(fDisplayList);
- Exit;
- end;
-
- glBindTexture(GL_TEXTURE_2D, fTexture);
- glPushMatrix();
-
- // move to top left glyph position
- glTranslatef(fBitmapCoords.Left, fBitmapCoords.Top, 0);
-
- // draw glyph texture
- glBegin(GL_QUADS);
- // top right
- glTexCoord2f(fTexOffset.X, 0);
- glVertex2f(fBitmapCoords.Width, 0);
-
- // top left
- glTexCoord2f(0, 0);
- glVertex2f(0, 0);
-
- // bottom left
- glTexCoord2f(0, fTexOffset.Y);
- glVertex2f(0, -fBitmapCoords.Height);
-
- // bottom right
- glTexCoord2f(fTexOffset.X, fTexOffset.Y);
- glVertex2f(fBitmapCoords.Width, -fBitmapCoords.Height);
- glEnd();
-
- glPopMatrix();
-end;
-
-procedure TFTGlyph.RenderReflection();
-var
- Color: TGLColor;
- TexUpperPos: single;
- TexLowerPos: single;
- UpperPos: single;
-const
- CutOff = 0.6;
-begin
- glPushMatrix();
- glBindTexture(GL_TEXTURE_2D, fTexture);
- glGetFloatv(GL_CURRENT_COLOR, @Color.vals);
-
- // add extra space to the left of the glyph
- glTranslatef(fBitmapCoords.Left, 0, 0);
-
- // The upper position of the glyph, if CutOff is 1.0, it is fFont.Ascender.
- // If CutOff is set to 0.5 only half of the glyph height is displayed.
- UpperPos := fFont.Descender + fFont.Height * CutOff;
-
- // the glyph texture's height is just the height of the glyph but not the font
- // height. Setting a color for the upper and lower bounds of the glyph results
- // in different color gradients. So we have to set the color values for the
- // descender and ascender (as we have a cutoff, for the upper-pos here) as
- // these positions are font but not glyph specific.
-
- // To get the texture positions we have to enhance the texture at the top and
- // bottom by the amount from the top to ascender (rather upper-pos here) and
- // from the bottom (Height-Top) to descender. Then we have to convert those
- // heights to texture coordinates by dividing by the bitmap Height and
- // removing the power-of-2 padding space by multiplying with fTexOffset.Y
- // (as fBitmapCoords.Height corresponds to fTexOffset.Y and not 1.0).
- TexUpperPos := -(UpperPos - fBitmapCoords.Top) / fBitmapCoords.Height * fTexOffset.Y;
- TexLowerPos := (-(fFont.Descender + fBitmapCoords.Height - fBitmapCoords.Top) /
- fBitmapCoords.Height + 1) * fTexOffset.Y;
-
- // draw glyph texture
- glBegin(GL_QUADS);
- // top right
- glColor4f(Color.r, Color.g, Color.b, 0);
- glTexCoord2f(fTexOffset.X, TexUpperPos);
- glVertex2f(fBitmapCoords.Width, UpperPos);
-
- // top left
- glTexCoord2f(0, TexUpperPos);
- glVertex2f(0, UpperPos);
-
- // bottom left
- glColor4f(Color.r, Color.g, Color.b, Color.a-0.3);
- glTexCoord2f(0, TexLowerPos);
- glVertex2f(0, fFont.Descender);
-
- // bottom right
- glTexCoord2f(fTexOffset.X, TexLowerPos);
- glVertex2f(fBitmapCoords.Width, fFont.Descender);
- glEnd();
-
- glPopMatrix();
-
- // restore old color
- // Note: glPopAttrib(GL_CURRENT_BIT)/glPopAttrib() is much slower then
- // glGetFloatv(GL_CURRENT_COLOR, ...)/glColor4fv(...)
- glColor4fv(@Color.vals);
-end;
-
-function TFTGlyph.GetAdvance(): TPositionDbl;
-begin
- Result := fAdvance;
-end;
-
-function TFTGlyph.GetBounds(): TBoundsDbl;
-begin
- Result := fBounds;
-end;
-
-
-{*
- * TGlyphCache
- *}
-
-constructor TGlyphCache.Create();
-begin
- inherited;
- fHash := TList.Create();
-end;
-
-destructor TGlyphCache.Destroy();
-begin
- // free cached glyphs
- FlushCache(false);
-
- // destroy TList
- fHash.Free;
-
- inherited;
-end;
-
-function TGlyphCache.FindGlyphTable(BaseCode: cardinal; out InsertPos: integer): PGlyphTable;
-var
- I: integer;
- Entry: TGlyphCacheHashEntry;
-begin
- Result := nil;
-
- for I := 0 to fHash.Count-1 do
- begin
- Entry := TGlyphCacheHashEntry(fHash[I]);
-
- if (Entry.BaseCode > BaseCode) then
- begin
- InsertPos := I;
- Exit;
- end;
-
- if (Entry.BaseCode = BaseCode) then
- begin
- InsertPos := I;
- Result := @Entry.GlyphTable;
- Exit;
- end;
- end;
-
- InsertPos := fHash.Count;
-end;
-
-function TGlyphCache.AddGlyph(ch: WideChar; const Glyph: TGlyph): boolean;
-var
- BaseCode: cardinal;
- GlyphCode: integer;
- InsertPos: integer;
- GlyphTable: PGlyphTable;
- Entry: TGlyphCacheHashEntry;
-begin
- Result := false;
-
- BaseCode := cardinal(ch) shr 8;
- GlyphTable := FindGlyphTable(BaseCode, InsertPos);
- if (GlyphTable = nil) then
- begin
- Entry := TGlyphCacheHashEntry.Create(BaseCode);
- GlyphTable := @Entry.GlyphTable;
- fHash.Insert(InsertPos, Entry);
- end;
-
- // get glyph table offset
- GlyphCode := cardinal(ch) and $FF;
- // insert glyph into table if not present
- if (GlyphTable[GlyphCode] = nil) then
- begin
- GlyphTable[GlyphCode] := Glyph;
- Result := true;
- end;
-end;
-
-procedure TGlyphCache.DeleteGlyph(ch: WideChar);
-var
- Table: PGlyphTable;
- TableIndex, GlyphIndex: integer;
- TableEmpty: boolean;
-begin
- // find table
- Table := FindGlyphTable(cardinal(ch) shr 8, TableIndex);
- if (Table = nil) then
- Exit;
-
- // find glyph
- GlyphIndex := cardinal(ch) and $FF;
- if (Table[GlyphIndex] <> nil) then
- begin
- // destroy glyph
- FreeAndNil(Table[GlyphIndex]);
-
- // check if table is empty
- TableEmpty := true;
- for GlyphIndex := 0 to High(Table^) do
- begin
- if (Table[GlyphIndex] <> nil) then
- begin
- TableEmpty := false;
- Break;
- end;
- end;
-
- // free empty table
- if (TableEmpty) then
- begin
- fHash.Delete(TableIndex);
- end;
- end;
-end;
-
-function TGlyphCache.GetGlyph(ch: WideChar): TGlyph;
-var
- InsertPos: integer;
- Table: PGlyphTable;
-begin
- Table := FindGlyphTable(cardinal(ch) shr 8, InsertPos);
- if (Table = nil) then
- Result := nil
- else
- Result := Table[cardinal(ch) and $FF];
-end;
-
-function TGlyphCache.HasGlyph(ch: WideChar): boolean;
-begin
- Result := (GetGlyph(ch) <> nil);
-end;
-
-procedure TGlyphCache.FlushCache(KeepBaseSet: boolean);
-var
- EntryIndex, TableIndex: integer;
- Entry: TGlyphCacheHashEntry;
-begin
- // destroy cached glyphs
- for EntryIndex := 0 to fHash.Count-1 do
- begin
- Entry := TGlyphCacheHashEntry(fHash[EntryIndex]);
-
- // the base set (0-255) has BaseCode 0 as the upper bytes are 0.
- if KeepBaseSet and (Entry.fBaseCode = 0) then
- Continue;
-
- for TableIndex := 0 to High(Entry.GlyphTable) do
- begin
- if (Entry.GlyphTable[TableIndex] <> nil) then
- FreeAndNil(Entry.GlyphTable[TableIndex]);
- end;
- FreeAndNil(Entry);
- end;
-end;
-
-
-{*
- * TGlyphCacheEntry
- *}
-
-constructor TGlyphCacheHashEntry.Create(BaseCode: cardinal);
-begin
- inherited Create();
- fBaseCode := BaseCode;
-end;
-
-
-{*
- * TFreeType
- *}
-
-class function TFreeType.GetLibrary(): FT_Library;
-begin
- if (LibraryInst = nil) then
- begin
- // initialize freetype
- if (FT_Init_FreeType(LibraryInst) <> 0) then
- raise Exception.Create('FT_Init_FreeType failed');
- end;
- Result := LibraryInst;
-end;
-
-class procedure TFreeType.FreeLibrary();
-begin
- if (LibraryInst <> nil) then
- FT_Done_FreeType(LibraryInst);
- LibraryInst := nil;
-end;
-
-
-{$IFDEF BITMAP_FONT}
-{*
- * TBitmapFont
- *}
-
-constructor TBitmapFont.Create(const Filename: string; Outline: integer;
- Baseline, Ascender, Descender: integer);
-begin
- inherited Create();
-
- fTex := Texture.LoadTexture(true, Filename, TEXTURE_TYPE_TRANSPARENT, 0);
- fTexSize := 1024;
- fOutline := Outline;
- fBaseline := Baseline;
- fAscender := Ascender;
- fDescender := Descender;
-
- LoadFontInfo(ChangeFileExt(Filename, '.dat'));
-
- ResetIntern();
-end;
-
-destructor TBitmapFont.Destroy();
-begin
- glDeleteTextures(1, @fTex.TexNum);
- inherited;
-end;
-
-procedure TBitmapFont.ResetIntern();
-begin
- fLineSpacing := Height;
-end;
-
-procedure TBitmapFont.Reset();
-begin
- inherited;
- ResetIntern();
-end;
-
-procedure TBitmapFont.CorrectWidths(WidthMult: real; WidthAdd: integer);
-var
- Count: integer;
-begin
- for Count := 0 to 255 do
- fWidths[Count] := Round(fWidths[Count] * WidthMult) + WidthAdd;
-end;
-
-procedure TBitmapFont.LoadFontInfo(const InfoFile: string);
-var
- Stream: TFileStream;
-begin
- FillChar(fWidths[0], Length(fWidths), 0);
-
- Stream := nil;
- try
- Stream := TFileStream.Create(InfoFile, fmOpenRead);
- Stream.Read(fWidths, 256);
- except
- raise Exception.Create('Could not read font info file ''' + InfoFile + '''');
- end;
- Stream.Free;
-end;
-
-function TBitmapFont.BBox(const Text: TWideStringArray; Advance: boolean): TBoundsDbl;
-var
- LineIndex, CharIndex: integer;
- CharCode: cardinal;
- Line: WideString;
- LineWidth: double;
-begin
- Result.Left := 0;
- Result.Right := 0;
- Result.Top := Height;
- Result.Bottom := 0;
-
- for LineIndex := 0 to High(Text) do
- begin
- Line := Text[LineIndex];
- LineWidth := 0;
- for CharIndex := 1 to Length(Line) do
- begin
- CharCode := Ord(Line[CharIndex]);
- if (CharCode < Length(fWidths)) then
- LineWidth := LineWidth + fWidths[CharCode];
- end;
- if (LineWidth > Result.Right) then
- Result.Right := LineWidth;
- end;
-end;
-
-procedure TBitmapFont.RenderChar(ch: WideChar; var AdvanceX: real);
-var
- TexX, TexY: real;
- TexR, TexB: real;
- GlyphWidth: real;
- PL, PT: real;
- PR, PB: real;
- CharCode: cardinal;
-begin
- CharCode := Ord(ch);
- if (CharCode > High(fWidths)) then
- CharCode := 0;
-
- GlyphWidth := fWidths[CharCode];
-
- // set texture positions
- TexX := (CharCode mod 16) * 1/16 + 1/32 - (GlyphWidth/2 - fOutline)/fTexSize;
- TexY := (CharCode div 16) * 1/16 + {2 texels} 2/fTexSize;
- TexR := (CharCode mod 16) * 1/16 + 1/32 + (GlyphWidth/2 + fOutline)/fTexSize;
- TexB := (1 + CharCode div 16) * 1/16 - {2 texels} 2/fTexSize;
-
- // set vector positions
- PL := AdvanceX - fOutline;
- PR := PL + GlyphWidth + fOutline*2;
- PB := -fBaseline;
- PT := PB + fTexSize div 16;
-
- (*
- if (Font.Blend) then
- begin
- glEnable(GL_BLEND);
- glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
- end;
- *)
-
- glEnable(GL_TEXTURE_2D);
- glBindTexture(GL_TEXTURE_2D, fTex.TexNum);
-
- if (not ReflectionPass) then
- begin
- glBegin(GL_QUADS);
- glTexCoord2f(TexX, TexY); glVertex2f(PL, PT);
- glTexCoord2f(TexX, TexB); glVertex2f(PL, PB);
- glTexCoord2f(TexR, TexB); glVertex2f(PR, PB);
- glTexCoord2f(TexR, TexY); glVertex2f(PR, PT);
- glEnd;
- end
- else
- begin
- glDepthRange(0, 10);
- glDepthFunc(GL_LEQUAL);
- glEnable(GL_DEPTH_TEST);
-
- glBegin(GL_QUADS);
- glTexCoord2f(TexX, TexY); glVertex2f(PL, PT);
- glTexCoord2f(TexX, TexB); glVertex2f(PL, PB);
- glTexCoord2f(TexR, TexB); glVertex2f(PR, PB);
- glTexCoord2f(TexR, TexY); glVertex2f(PR, PT);
- glEnd;
-
- glBegin(GL_QUADS);
- glTexCoord2f(TexX, TexY); glVertex2f(PL, PT);
- glTexCoord2f(TexX, TexB); glVertex2f(PL, PB);
- glTexCoord2f(TexR, TexB); glVertex2f(PR, PB);
- glTexCoord2f(TexR, TexY); glVertex2f(PR, PT);
-
-(*
- glColor4f(fTempColor.r, fTempColor.g, fTempColor.b, 0.7);
- glTexCoord2f(TexX, TexB); glVertex3f(PL, PB, 0);
- glTexCoord2f(TexR, TexB); glVertex3f(PR, PB, 0);
-
- glColor4f(fTempColor.r, fTempColor.g, fTempColor.b, 0);
- glTexCoord2f(TexR, (TexY + TexB)/2); glVertex3f(PR, (PT + PB)/2, 0);
- glTexCoord2f(TexX, (TexY + TexB)/2); glVertex3f(PL, (PT + PB)/2, 0);
-*)
- glEnd;
-
- //write the colour back
- glColor4fv(@fTempColor);
-
- glDisable(GL_DEPTH_TEST);
- end; // reflection
-
- glDisable(GL_TEXTURE_2D);
- (*
- if (Font.Blend) then
- glDisable(GL_BLEND);
- *)
-
- AdvanceX := AdvanceX + GlyphWidth;
-end;
-
-procedure TBitmapFont.Render(const Text: WideString);
-var
- CharIndex: integer;
- AdvanceX: real;
-begin
- // if there is no text do nothing
- if (Text = '') then
- Exit;
-
- //Save the current color and alpha (for reflection)
- glGetFloatv(GL_CURRENT_COLOR, @fTempColor);
-
- AdvanceX := 0;
- for CharIndex := 1 to Length(Text) do
- begin
- RenderChar(Text[CharIndex], AdvanceX);
- end;
-end;
-
-function TBitmapFont.GetHeight(): single;
-begin
- Result := fAscender - fDescender;
-end;
-
-function TBitmapFont.GetAscender(): single;
-begin
- Result := fAscender;
-end;
-
-function TBitmapFont.GetDescender(): single;
-begin
- Result := fDescender;
-end;
-
-function TBitmapFont.GetUnderlinePosition(): single;
-begin
- Result := -2.0;
-end;
-
-function TBitmapFont.GetUnderlineThickness(): single;
-begin
- Result := 1.0;
-end;
-
-{$ENDIF BITMAP_FONT}
-
-
-initialization
-
-finalization
- TFreeType.FreeLibrary();
-
-end.
diff --git a/src/lib/freetype/demo/lesson43.bdsproj b/src/lib/freetype/demo/engine-test.bdsproj index 30f88ab3..9547f18f 100644 --- a/src/lib/freetype/demo/lesson43.bdsproj +++ b/src/lib/freetype/demo/engine-test.bdsproj @@ -10,7 +10,7 @@ </PersonalityInfo>
<Delphi.Personality>
<Source>
- <Source Name="MainSource">lesson43.dpr</Source>
+ <Source Name="MainSource">engine-test.dpr</Source>
</Source>
<FileVersion>
<FileVersion Name="Version">7.0</FileVersion>
diff --git a/src/lib/freetype/demo/lesson43.dpr b/src/lib/freetype/demo/engine-test.dpr index 8a470a2e..80177735 100644 --- a/src/lib/freetype/demo/lesson43.dpr +++ b/src/lib/freetype/demo/engine-test.dpr @@ -1,366 +1,336 @@ -program lesson43;
-(*
- * This code was created by Jeff Molofee '99
- * (ported to Linux/SDL by Ti Leggett '01)
- *
- * If you've found this code useful, please let me know.
- *
- * Visit Jeff at http://nehe.gamedev.net/
- *
- * or for port-specific comments, questions, bugreports etc.
- * email to leggett@eecs.tulane.edu
- *)
-
-{$IFDEF FPC}
- {$mode delphi}{$H+}
-{$ENDIF}
-
-{$APPTYPE Console}
-
-{.$DEFINE FONT2}
-
-uses
- moduleloader in '../../JEDI-SDL/SDL/Pas/moduleloader.pas',
- SDL in '../../JEDI-SDL/SDL/Pas/sdl.pas',
- gl in '../../JEDI-SDL/OpenGL/Pas/gl.pas',
- glext in '../../JEDI-SDL/OpenGL/Pas/glext.pas',
- glu in '../../JEDI-SDL/OpenGL/Pas/glu.pas',
- ctypes in '../../ctypes/ctypes.pas',
- FreeType in '../freetype.pas',
- {$IFNDEF FONT2}
- UFont in 'UFont.pas',
- {$ELSE}
- UFont2 in 'UFont2.pas',
- {$ENDIF}
- math,
- sysutils;
-
-const
- // screen width, height, and bit depth
- SCREEN_WIDTH = 640;
- SCREEN_HEIGHT = 480;
- SCREEN_BPP = 16;
-
- //FONT_FILE = 'Test.ttf';
- //FONT_FILE = 'C:/Windows/Fonts/Arial.ttf';
- //FONT_FILE = 'C:/Windows/Fonts/SimSun.ttf';
- //FONT_FILE = 'C:/Windows/Fonts/SimSun.ttf';
- FONT_FILE = 'eurostarregularextended.ttf';
-
-var
- OurFont: TScalableFont;
- // This is our SDL surface
- surface: PSDL_Surface;
- cnt1, cnt2: GLfloat;
-
-(* function to release/destroy our resources and restoring the old desktop *)
-procedure Quit(returnCode: integer);
-begin
- OurFont.Free;
-
- // clean up the window
- SDL_Quit( );
-
- // and exit appropriately
- Halt( returnCode );
-end;
-
-(* function to reset our viewport after a window resize *)
-function resizeWindow(width: integer; height: integer): boolean;
-begin
- // Protect against a divide by zero
- if ( height = 0 ) then
- height := 1;
-
- // Setup our viewport.
- glViewport( 0, 0, GLsizei(width), GLsizei(height) );
-
- // change to the projection matrix and set our viewing volume.
- glMatrixMode( GL_PROJECTION );
- glLoadIdentity( );
-
- // Set our perspective
- //gluOrtho2D(0, width, 0, height);
- gluOrtho2D(0, 800, 0, 600);
-
- // Make sure we're chaning the model view and not the projection
- glMatrixMode( GL_MODELVIEW );
-
- // Reset The View
- glLoadIdentity( );
-
- Result := true;
-end;
-
-(* function to handle key press events *)
-procedure handleKeyPress(keysym: PSDL_keysym);
-begin
- case ( keysym^.sym ) of
- SDLK_ESCAPE:
- begin
- // ESC key was pressed
- Quit( 0 );
- end;
- SDLK_F1:
- begin
- // F1 key was pressed
- // this toggles fullscreen mode
- SDL_WM_ToggleFullScreen( surface );
- end;
- end;
-end;
-
-(* general OpenGL initialization function *)
-function initGL(): boolean;
-begin
- // Enable smooth shading
- glShadeModel( GL_SMOOTH );
-
- // Set the background black
- //glClearColor( 1, 1, 1.0, 1.0 );
- //glClearColor( 0.3, 0.7, 1.0, 1.0 );
- glClearColor( 0.0, 0.0, 0.0, 1.0 );
-
- // Depth buffer setup
- glClearDepth( 1.0 );
-
- // Enables Depth Testing
- glEnable( GL_DEPTH_TEST );
-
- // The Type Of Depth Test To Do
- glDepthFunc( GL_LEQUAL );
-
- // Really Nice Perspective Calculations
- glHint( GL_PERSPECTIVE_CORRECTION_HINT, GL_NICEST );
-
- //OurFont := TFTScalableFont.Create(FONT_FILE, 64);
- //OurFont := TFTFont.Create(FONT_FILE, 128);
- OurFont := TFTScalableOutlineFont.Create(FONT_FILE, 64, 0.05);
- //OurFont.UseKerning := false;
- TFTScalableOutlineFont(OurFont).SetOutlineColor(1, 0, 0);
- //OurFont := TOutlineFont.Create(FONT_FILE, 32, 2);
- //OurFont.LineSpacing := OurFont.LineSpacing * 0.5;
-
- Result := true;
-end;
-
-var
- NextTime: cardinal;
- Counter: integer;
-
-type
- TVector4d = array[0..3] of GLdouble;
-
-function NewVector4d(a, b, c, d: GLdouble): TVector4d;
-begin
- Result[0] := a;
- Result[1] := b;
- Result[2] := c;
- Result[3] := d;
-end;
-
-(* Here goes our drawing code *)
-function drawGLScene(): boolean;
-var
- msg: WideString;
- bounds: TBoundsDbl;
- ClipPlaneEq: TVector4d;
-begin
- glClear(GL_COLOR_BUFFER_BIT or GL_DEPTH_BUFFER_BIT); // Clear Screen And Depth Buffer
-
- //msg := 'Here'#13'there'#13'be'#13#13'newlines'#13'.';
- //msg := 'Here'#13'newlines';
- msg := 'Hallo Du';//Active FreeType Text - ' + FloatToStr(cnt1);
- //msg := 'Hören'#13'其自诞生至今'#13'спецификация';
-
- // Red text
- glLoadIdentity();
- glTranslatef(cnt2, 240, 0);
- if (cnt2 > 800) then
- cnt2 := 0;
- glTranslatef(30, 40, 0);
- //glTranslatef(320, 240, 0);
- //glRotatef(cnt1, 0, 0, 1);
- //glScalef(1, 0.8 + 0.3*cos(cnt1/5), 1);
-
- OurFont.Style := [Italic, Underline, Reflect];
- //OurFont.GlyphSpacing := 10;
- //OurFont.SetOutlineColor(0.5, 0.5, 0.5);
- //OurFont.ReflectionSpacing := -4;
- //OurFont.UseKerning := false;
- OurFont.Height := 32;//cnt2;
- //OurFont.Reset;
- //OurFont.Aspect := 2;
-
- {
- glColor3f(1, 1, 0);
- bounds := OurFont.BBox(msg);
- glRectf(bounds.Left, bounds.Top, bounds.Right, bounds.Bottom);
- }
-
- {
- glEnable(GL_CLIP_PLANE0);
- ClipPlaneEq := NewVector4d(-1, 0, 0, bounds.Right/5);
- glClipPlane(GL_CLIP_PLANE0, @ClipPlaneEq);
- }
- //glColor3f(1, 0, 0);
- glColor3f(1, 1, 1);
- //OurFont.ReflectionSpacing := 0;
- OurFont.Print(msg);
-
- glTranslatef(0, 50, 0);
- glColor3f(1, 1, 0);
- bounds := OurFont.BBox('Hallo ');
- glRectf(bounds.Left, bounds.Top, bounds.Right, bounds.Bottom);
- OurFont.Print('Hallo ');
-
- {
- ClipPlaneEq := NewVector4d(1, 0, 0, -bounds.Right/5);
- glClipPlane(GL_CLIP_PLANE0, @ClipPlaneEq);
- glColor3f(0, 0, 1);
- OurFont.Print(msg);
- glDisable(GL_CLIP_PLANE0);
- //glColor3f(0, 1, 0);
- //OurFont.Style := OurFont.Style - [Italic];
- //OurFont.Print(msg);
- }
-
- cnt1 := cnt1 + 0.051; // Increase The First Counter
- cnt2 := cnt2 + 0.005; // Increase The First Counter
-
- SDL_GL_SwapBuffers( );
-
- Inc(Counter);
-
- if (NextTime < SDL_GetTicks()) then
- begin
- NextTime := SDL_GetTicks() + 2000;
- writeln('FPS: ' + floattostr(Counter / 2.0));
- Counter := 0;
- end;
-
- Result := true;
-end;
-
-var
- // Flags to pass to SDL_SetVideoMode
- videoFlags: integer;
- // main loop variable
- done: boolean = false;
- // used to collect events
- event: TSDL_Event;
- // this holds some info about our display
- videoInfo: PSDL_VideoInfo;
- // whether or not the window is active
- isActive: boolean = true;
-
-begin
- // initialize SDL
- if ( SDL_Init( SDL_INIT_VIDEO or SDL_INIT_TIMER ) < 0 ) then
- begin
- writeln( ErrOutput, 'Video initialization failed: ' + SDL_GetError() );
- Quit( 1 );
- end;
-
- // Fetch the video info
- videoInfo := SDL_GetVideoInfo( );
-
- if ( videoInfo = nil ) then
- begin
- writeln( ErrOutput, 'Video query failed: ' + SDL_GetError() );
- Quit( 1 );
- end;
-
- SDL_GL_SetAttribute( SDL_GL_DOUBLEBUFFER, 1 ); // Enable double buffering
-
- // the flags to pass to SDL_SetVideoMode
- videoFlags := SDL_OPENGL; // Enable OpenGL in SDL
- videoFlags := videoFlags or SDL_HWPALETTE; // Store the palette in hardware
- videoFlags := videoFlags or SDL_RESIZABLE; // Enable window resizing
-
- // This checks to see if surfaces can be stored in memory
- if ( videoInfo^.hw_available <> 0 ) then
- videoFlags := videoFlags or SDL_HWSURFACE
- else
- videoFlags := videoFlags or SDL_SWSURFACE;
-
- // This checks if hardware blits can be done
- if ( videoInfo^.blit_hw <> 0 ) then
- videoFlags := videoFlags or SDL_HWACCEL;
-
- // Sets up OpenGL double buffering
- SDL_GL_SetAttribute( SDL_GL_DOUBLEBUFFER, 1 );
-
- // get a SDL surface
- surface := SDL_SetVideoMode( SCREEN_WIDTH, SCREEN_HEIGHT, SCREEN_BPP,
- videoFlags );
-
- // Verify there is a surface
- if ( surface = nil ) then
- begin
- writeln( ErrOutput, 'Video mode set failed: ' + SDL_GetError() );
- Quit( 1 );
- end;
-
- // initialize OpenGL
- initGL();
-
- // resize the initial window
- resizeWindow( SCREEN_WIDTH, SCREEN_HEIGHT );
-
- // wait for events
- while ( not done ) do
- begin
- { handle the events in the queue }
-
- while ( SDL_PollEvent( @event ) <> 0 ) do
- begin
- case( event.type_ ) of
- SDL_ACTIVEEVENT:
- begin
- // Something's happend with our focus
- // If we are iconified, we shouldn't draw the screen
- if ( (event.active.state and SDL_APPACTIVE) <> 0 ) then
- begin
- if ( event.active.gain = 0 ) then
- isActive := false
- else
- isActive := true;
- end;
- end;
- SDL_VIDEORESIZE:
- begin
- // handle resize event
- {$IFDEF UNIX}
- surface := SDL_SetVideoMode( event.resize.w,
- event.resize.h,
- 16, videoFlags );
- if ( surface = nil ) then
- begin
- writeln( ErrOutput, 'Could not get a surface after resize: ' + SDL_GetError( ) );
- Quit( 1 );
- end;
- {$ENDIF}
- resizeWindow( event.resize.w, event.resize.h );
- end;
- SDL_KEYDOWN:
- begin
- // handle key presses
- handleKeyPress( @event.key.keysym );
- end;
- SDL_QUITEV:
- begin
- // handle quit requests
- done := true;
- end;
- end;
- end;
-
- // draw the scene
- if ( isActive ) then
- drawGLScene( );
- end;
-
- // clean ourselves up and exit
- Quit( 0 );
-end.
+program engine_test; +(* + * This code was created by Jeff Molofee '99 + * (ported to Linux/SDL by Ti Leggett '01) + * + * If you've found this code useful, please let me know. + * + * Visit Jeff at http://nehe.gamedev.net/ + * + * or for port-specific comments, questions, bugreports etc. + * email to leggett@eecs.tulane.edu + *) + +{$IFDEF FPC} + {$mode delphi}{$H+} +{$ENDIF} + +{$APPTYPE Console} + +uses + moduleloader in '../../JEDI-SDL/SDL/Pas/moduleloader.pas', + SDL in '../../JEDI-SDL/SDL/Pas/sdl.pas', + gl in '../../JEDI-SDL/OpenGL/Pas/gl.pas', + glext in '../../JEDI-SDL/OpenGL/Pas/glext.pas', + glu in '../../JEDI-SDL/OpenGL/Pas/glu.pas', + {$IFNDEF FPC} + ctypes in '../../ctypes/ctypes.pas', + {$ENDIF} + FreeType in '../freetype.pas', + UFont in '../../../base/UFont.pas', + math, + sysutils; + +const + // screen width, height, and bit depth + SCREEN_WIDTH = 640; + SCREEN_HEIGHT = 480; + SCREEN_BPP = 16; + + //FONT_FILE = 'Test.ttf'; + //FONT_FILE = 'C:/Windows/Fonts/Arial.ttf'; + //FONT_FILE = 'C:/Windows/Fonts/SimSun.ttf'; + //FONT_FILE = 'eurostarregularextended.ttf'; + FONT_FILE = 'FreeSans.ttf'; + +var + OurFont: TScalableFont; + // This is our SDL surface + surface: PSDL_Surface; + cnt1, cnt2: GLfloat; + +(* function to release/destroy our resources and restoring the old desktop *) +procedure Quit(returnCode: integer); +begin + OurFont.Free; + + // clean up the window + SDL_Quit( ); + + // and exit appropriately + Halt( returnCode ); +end; + +(* function to reset our viewport after a window resize *) +function resizeWindow(width: integer; height: integer): boolean; +begin + // Protect against a divide by zero + if ( height = 0 ) then + height := 1; + + // Setup our viewport. + glViewport( 0, 0, GLsizei(width), GLsizei(height) ); + + // change to the projection matrix and set our viewing volume. + glMatrixMode( GL_PROJECTION ); + glLoadIdentity( ); + + // Set our perspective + //gluOrtho2D(0, width, 0, height); + gluOrtho2D(0, 800, 0, 600); + + // Make sure we're chaning the model view and not the projection + glMatrixMode( GL_MODELVIEW ); + + // Reset The View + glLoadIdentity( ); + + Result := true; +end; + +(* function to handle key press events *) +procedure handleKeyPress(keysym: PSDL_keysym); +begin + case ( keysym^.sym ) of + SDLK_ESCAPE: + begin + // ESC key was pressed + Quit( 0 ); + end; + SDLK_F1: + begin + // F1 key was pressed + // this toggles fullscreen mode + SDL_WM_ToggleFullScreen( surface ); + end; + end; +end; + +(* general OpenGL initialization function *) +function initGL(): boolean; +begin + // Enable smooth shading + glShadeModel( GL_SMOOTH ); + + // Set the background black + //glClearColor( 1, 1, 1.0, 1.0 ); + //glClearColor( 0.3, 0.7, 1.0, 1.0 ); + glClearColor( 0.0, 0.0, 0.0, 1.0 ); + + // Depth buffer setup + glClearDepth( 1.0 ); + + // Enables Depth Testing + glEnable( GL_DEPTH_TEST ); + + // The Type Of Depth Test To Do + glDepthFunc( GL_LEQUAL ); + + // Really Nice Perspective Calculations + glHint( GL_PERSPECTIVE_CORRECTION_HINT, GL_NICEST ); + + //OurFont := TFTScalableFont.Create(FONT_FILE, 64); + //OurFont := TFTFont.Create(FONT_FILE, 128); + OurFont := TFTScalableOutlineFont.Create(FONT_FILE, 64, 0.05); + //OurFont.UseKerning := false; + TFTScalableOutlineFont(OurFont).SetOutlineColor(1, 0, 0); + //OurFont := TOutlineFont.Create(FONT_FILE, 32, 2); + //OurFont.LineSpacing := OurFont.LineSpacing * 0.5; + + Result := true; +end; + +var + NextTime: cardinal; + Counter: integer; + +type + TVector4d = array[0..3] of GLdouble; + +function NewVector4d(a, b, c, d: GLdouble): TVector4d; +begin + Result[0] := a; + Result[1] := b; + Result[2] := c; + Result[3] := d; +end; + +(* Here goes our drawing code *) +function drawGLScene(): boolean; +var + msg: WideString; + bounds: TBoundsDbl; +begin + glClear(GL_COLOR_BUFFER_BIT or GL_DEPTH_BUFFER_BIT); // Clear Screen And Depth Buffer + + //msg := 'Here'#13'there'#13'be'#13#13'newlines'#13'.'; + //msg := 'Here'#13'newlines'; + msg := 'Active FreeType Text - ' + FloatToStr(cnt1); + //msg := 'Hören'#13'其自诞生至今'#13'спецификация'; + + // Red text + glLoadIdentity(); + glTranslatef(cnt2, 240, 0); + if (cnt2 > 800) then + cnt2 := 0; + glTranslatef(30, 40, 0); + //glTranslatef(320, 240, 0); + //glRotatef(cnt1, 0, 0, 1); + //glScalef(1, 0.8 + 0.3*cos(cnt1/5), 1); + + OurFont.Style := [Italic, {Underline,} Reflect]; + //OurFont.GlyphSpacing := 10; + //OurFont.SetOutlineColor(0.5, 0.5, 0.5); + //OurFont.ReflectionSpacing := -4; + //OurFont.UseKerning := false; + OurFont.Height := 64;//cnt2; + //OurFont.Reset; + //OurFont.Aspect := 2; + + glColor3f(1, 1, 0); + bounds := OurFont.BBox(msg); + //glRectf(bounds.Left, OurFont.Ascender, bounds.Right, OurFont.Ascender-OurFont.Height); + + glColor3f(1, 1, 1); + //OurFont.ReflectionSpacing := 0; + OurFont.Print(msg); + + cnt1 := cnt1 + 0.051; // Increase The First Counter + cnt2 := cnt2 + 0.005; // Increase The First Counter + + SDL_GL_SwapBuffers( ); + + Inc(Counter); + + if (NextTime < SDL_GetTicks()) then + begin + NextTime := SDL_GetTicks() + 2000; + writeln('FPS: ' + floattostr(Counter / 2.0)); + Counter := 0; + end; + + Result := true; +end; + +var + // Flags to pass to SDL_SetVideoMode + videoFlags: integer; + // main loop variable + done: boolean = false; + // used to collect events + event: TSDL_Event; + // this holds some info about our display + videoInfo: PSDL_VideoInfo; + // whether or not the window is active + isActive: boolean = true; + +begin + // initialize SDL + if ( SDL_Init( SDL_INIT_VIDEO or SDL_INIT_TIMER ) < 0 ) then + begin + writeln( ErrOutput, 'Video initialization failed: ' + SDL_GetError() ); + Quit( 1 ); + end; + + // Fetch the video info + videoInfo := SDL_GetVideoInfo( ); + + if ( videoInfo = nil ) then + begin + writeln( ErrOutput, 'Video query failed: ' + SDL_GetError() ); + Quit( 1 ); + end; + + SDL_GL_SetAttribute( SDL_GL_DOUBLEBUFFER, 1 ); // Enable double buffering + + // the flags to pass to SDL_SetVideoMode + videoFlags := SDL_OPENGL; // Enable OpenGL in SDL + videoFlags := videoFlags or SDL_HWPALETTE; // Store the palette in hardware + videoFlags := videoFlags or SDL_RESIZABLE; // Enable window resizing + + // This checks to see if surfaces can be stored in memory + if ( videoInfo^.hw_available <> 0 ) then + videoFlags := videoFlags or SDL_HWSURFACE + else + videoFlags := videoFlags or SDL_SWSURFACE; + + // This checks if hardware blits can be done + if ( videoInfo^.blit_hw <> 0 ) then + videoFlags := videoFlags or SDL_HWACCEL; + + // Sets up OpenGL double buffering + SDL_GL_SetAttribute( SDL_GL_DOUBLEBUFFER, 1 ); + + // get a SDL surface + surface := SDL_SetVideoMode( SCREEN_WIDTH, SCREEN_HEIGHT, SCREEN_BPP, + videoFlags ); + + // Verify there is a surface + if ( surface = nil ) then + begin + writeln( ErrOutput, 'Video mode set failed: ' + SDL_GetError() ); + Quit( 1 ); + end; + + // initialize OpenGL + initGL(); + + // resize the initial window + resizeWindow( SCREEN_WIDTH, SCREEN_HEIGHT ); + + // wait for events + while ( not done ) do + begin + { handle the events in the queue } + + while ( SDL_PollEvent( @event ) <> 0 ) do + begin + case( event.type_ ) of + SDL_ACTIVEEVENT: + begin + // Something's happend with our focus + // If we are iconified, we shouldn't draw the screen + if ( (event.active.state and SDL_APPACTIVE) <> 0 ) then + begin + if ( event.active.gain = 0 ) then + isActive := false + else + isActive := true; + end; + end; + SDL_VIDEORESIZE: + begin + // handle resize event + {$IFDEF UNIX} + surface := SDL_SetVideoMode( event.resize.w, + event.resize.h, + 16, videoFlags ); + if ( surface = nil ) then + begin + writeln( ErrOutput, 'Could not get a surface after resize: ' + SDL_GetError( ) ); + Quit( 1 ); + end; + {$ENDIF} + resizeWindow( event.resize.w, event.resize.h ); + end; + SDL_KEYDOWN: + begin + // handle key presses + handleKeyPress( @event.key.keysym ); + end; + SDL_QUITEV: + begin + // handle quit requests + done := true; + end; + end; + end; + + // draw the scene + if ( isActive ) then + drawGLScene( ); + end; + + // clean ourselves up and exit + Quit( 0 ); +end. diff --git a/src/lib/freetype/demo/lesson43.lpi b/src/lib/freetype/demo/engine-test.lpi index b6791f18..6cbfe1eb 100644 --- a/src/lib/freetype/demo/lesson43.lpi +++ b/src/lib/freetype/demo/engine-test.lpi @@ -7,7 +7,7 @@ <MainUnit Value="0"/>
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diff --git a/src/lib/freetype/demo/nehe/UFreeType.pas b/src/lib/freetype/demo/nehe/UFreeType.pas new file mode 100644 index 00000000..c1243aae --- /dev/null +++ b/src/lib/freetype/demo/nehe/UFreeType.pas @@ -0,0 +1,326 @@ +unit UFreeType; + +{$IFDEF FPC} + {$mode delphi}{$H+} +{$ENDIF} + +interface + +uses + FreeType, + gl, + glu, + classes, + sysutils; + +type + // This holds all of the information related to any + // freetype font that we want to create. + TFontData = class + h: single; ///< Holds the height of the font. + textures: array of GLuint; ///< Holds the texture id's + list_base: GLuint; ///< Holds the first display list id + + // The init function will create a font of + // of the height h from the file fname. + constructor Create(const fname: string; h: cardinal); + + // Free all the resources assosiated with the font. + destructor Destroy(); override; + end; + + TFreeType = class + public + // The flagship function of the library - this thing will print + // out text at window coordinates x,y, using the font ft_font. + // The current modelview matrix will also be applied to the text. + class procedure print(ft_font: TFontData; x, y: single; const str: string); + end; + + +implementation + + +// This function gets the first power of 2 >= the +// int that we pass it. +function next_p2 ( a: integer ): integer; inline; +begin + Result := 1; + while (Result < a) do + Result := Result shl 1; +end; + +type + PAGLuint = ^AGLuint; + AGLuint = array[0..High(Word)] of GLuint; + +// Create a display list coresponding to the given character. +procedure make_dlist ( face: FT_Face; ch: byte; list_base: GLuint; tex_base: PAGLuint ); +var + i, j: integer; + width, height: integer; + glyph: FT_Glyph; + bitmap_glyph: FT_BitmapGlyph; + bitmap: PFT_Bitmap; + expanded_data: array of GLubyte; + x, y: single; +begin + // The first thing we do is get FreeType to render our character + // into a bitmap. This actually requires a couple of FreeType commands: + + // Load the Glyph for our character. + if (FT_Load_Glyph( face, FT_Get_Char_Index( face, ch ), FT_LOAD_DEFAULT ) <> 0) then + raise Exception.create('FT_Load_Glyph failed'); + + // Move the face's glyph into a Glyph object. + if (FT_Get_Glyph( face^.glyph, glyph ) <> 0) then + raise Exception.create('FT_Get_Glyph failed'); + + // Convert the glyph to a bitmap. + FT_Glyph_To_Bitmap( glyph, ft_render_mode_normal, nil, 1 ); + bitmap_glyph := FT_BitmapGlyph(glyph); + + // This reference will make accessing the bitmap easier + bitmap := @bitmap_glyph^.bitmap; + + // Use our helper function to get the widths of + // the bitmap data that we will need in order to create + // our texture. + width := next_p2( bitmap.width ); + height := next_p2( bitmap.rows ); + + // Allocate memory for the texture data. + SetLength(expanded_data, 2 * width * height); + + // Here we fill in the data for the expanded bitmap. + // Notice that we are using two channel bitmap (one for + // luminocity and one for alpha), but we assign + // both luminocity and alpha to the value that we + // find in the FreeType bitmap. + // We use the ?: operator so that value which we use + // will be 0 if we are in the padding zone, and whatever + // is the the Freetype bitmap otherwise. + for j := 0 to height-1 do + begin + for i := 0 to width-1 do + begin + if ((i >= bitmap.width) or (j >= bitmap.rows)) then + expanded_data[2*(i+j*width)] := 0 + else + expanded_data[2*(i+j*width)] := byte(bitmap.buffer[i + bitmap.width*j]); + expanded_data[2*(i+j*width)+1] := expanded_data[2*(i+j*width)]; + end; + end; + + + // Now we just setup some texture paramaters. + glBindTexture( GL_TEXTURE_2D, tex_base[integer(ch)]); + glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MAG_FILTER,GL_LINEAR); + glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,GL_LINEAR); + + // Here we actually create the texture itself, notice + // that we are using GL_LUMINANCE_ALPHA to indicate that + // we are using 2 channel data. + glTexImage2D( GL_TEXTURE_2D, 0, GL_RGBA, width, height, + 0, GL_LUMINANCE_ALPHA, GL_UNSIGNED_BYTE, @expanded_data[0] ); + + //With the texture created, we don't need to expanded data anymore + SetLength(expanded_data, 0); + + //So now we can create the display list + glNewList(list_base+ch, GL_COMPILE); + + glBindTexture(GL_TEXTURE_2D, tex_base[ch]); + + glPushMatrix(); + + //first we need to move over a little so that + //the character has the right amount of space + //between it and the one before it. + glTranslatef(bitmap_glyph^.left, 0, 0); + + //Now we move down a little in the case that the + //bitmap extends past the bottom of the line + //(this is only true for characters like 'g' or 'y'. + glTranslatef(0, bitmap_glyph^.top - bitmap.rows, 0); + + //Now we need to account for the fact that many of + //our textures are filled with empty padding space. + //We figure what portion of the texture is used by + //the actual character and store that information in + //the x and y variables, then when we draw the + //quad, we will only reference the parts of the texture + //that we contain the character itself. + x := bitmap.width / width; + y := bitmap.rows / height; + + //Here we draw the texturemaped quads. + //The bitmap that we got from FreeType was not + //oriented quite like we would like it to be, + //so we need to link the texture to the quad + //so that the result will be properly aligned. + glBegin(GL_QUADS); + glTexCoord2d(0, 0); glVertex2f(0, bitmap.rows); + glTexCoord2d(0, y); glVertex2f(0, 0); + glTexCoord2d(x, y); glVertex2f(bitmap.width, 0); + glTexCoord2d(x, 0); glVertex2f(bitmap.width, bitmap.rows); + glEnd(); + + glPopMatrix(); + glTranslatef(face^.glyph^.advance.x shr 6, 0, 0); + + //increment the raster position as if we were a bitmap font. + //(only needed if you want to calculate text length) + //glBitmap(0,0,0,0,face->glyph->advance.x >> 6,0,NULL); + + //Finnish the display list + glEndList(); +end; + + +constructor TFontData.Create(const fname: string; h: cardinal); +var + library_: FT_Library; + //The object in which Freetype holds information on a given + //font is called a "face". + face: FT_Face; + i: byte; +begin + //Allocate some memory to store the texture ids. + SetLength(textures, 128); + + Self.h := h; + + //Create and initilize a freetype font library. + if (FT_Init_FreeType( library_ ) <> 0) then + raise Exception.create('FT_Init_FreeType failed'); + + //This is where we load in the font information from the file. + //Of all the places where the code might die, this is the most likely, + //as FT_New_Face will die if the font file does not exist or is somehow broken. + if (FT_New_Face( library_, PChar(fname), 0, face ) <> 0) then + raise Exception.create('FT_New_Face failed (there is probably a problem with your font file)'); + + //For some twisted reason, Freetype measures font size + //in terms of 1/64ths of pixels. Thus, to make a font + //h pixels high, we need to request a size of h*64. + //(h shl 6 is just a prettier way of writting h*64) + FT_Set_Char_Size( face, h shl 6, h shl 6, 96, 96); + + //Here we ask opengl to allocate resources for + //all the textures and displays lists which we + //are about to create. + list_base := glGenLists(128); + glGenTextures( 128, @textures[0] ); + + //This is where we actually create each of the fonts display lists. + for i := 0 to 127 do + make_dlist(face, i, list_base, @textures[0]); + + //We don't need the face information now that the display + //lists have been created, so we free the assosiated resources. + FT_Done_Face(face); + + //Ditto for the library. + FT_Done_FreeType(library_); +end; + +destructor TFontData.Destroy(); +begin + glDeleteLists(list_base, 128); + glDeleteTextures(128, @textures[0]); + SetLength(textures, 0); +end; + +/// A fairly straight forward function that pushes +/// a projection matrix that will make object world +/// coordinates identical to window coordinates. +procedure pushScreenCoordinateMatrix(); inline; +var + viewport: array [0..3] of GLint; +begin + glPushAttrib(GL_TRANSFORM_BIT); + glGetIntegerv(GL_VIEWPORT, @viewport); + glMatrixMode(GL_PROJECTION); + glPushMatrix(); + glLoadIdentity(); + gluOrtho2D(viewport[0], viewport[2], viewport[1], viewport[3]); + glPopAttrib(); +end; + +/// Pops the projection matrix without changing the current +/// MatrixMode. +procedure pop_projection_matrix(); inline; +begin + glPushAttrib(GL_TRANSFORM_BIT); + glMatrixMode(GL_PROJECTION); + glPopMatrix(); + glPopAttrib(); +end; + +///Much like Nehe's glPrint function, but modified to work +///with freetype fonts. +class procedure TFreeType.print(ft_font: TFontData; x, y: single; const str: string); +var + font: GLuint; + h: single; + i: cardinal; + lines: TStringList; + modelview_matrix: array[0..15] of single; +begin + // We want a coordinate system where things coresponding to window pixels. + pushScreenCoordinateMatrix(); + + font := ft_font.list_base; + h := ft_font.h / 0.63; //We make the height about 1.5* that of + + lines := TStringList.Create(); + ExtractStrings([#13], [], PChar(str), lines); + + glPushAttrib(GL_LIST_BIT or GL_CURRENT_BIT or GL_ENABLE_BIT or GL_TRANSFORM_BIT); + glMatrixMode(GL_MODELVIEW); + glDisable(GL_LIGHTING); + glEnable(GL_TEXTURE_2D); + glDisable(GL_DEPTH_TEST); + glEnable(GL_BLEND); + glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA); + + glListBase(font); + + glGetFloatv(GL_MODELVIEW_MATRIX, @modelview_matrix); + + //This is where the text display actually happens. + //For each line of text we reset the modelview matrix + //so that the line's text will start in the correct position. + //Notice that we need to reset the matrix, rather than just translating + //down by h. This is because when each character is + //draw it modifies the current matrix so that the next character + //will be drawn immediatly after it. + for i := 0 to lines.Count-1 do + begin + glPushMatrix(); + glLoadIdentity(); + glTranslatef(x, y - h*i, 0); + glMultMatrixf(@modelview_matrix); + + // The commented out raster position stuff can be useful if you need to + // know the length of the text that you are creating. + // If you decide to use it make sure to also uncomment the glBitmap command + // in make_dlist(). + //glRasterPos2f(0,0); + glCallLists(Length(lines[i]), GL_UNSIGNED_BYTE, PChar(lines[i])); + //float rpos[4]; + //glGetFloatv(GL_CURRENT_RASTER_POSITION ,rpos); + //float len=x-rpos[0]; + + glPopMatrix(); + end; + + glPopAttrib(); + + pop_projection_matrix(); + + lines.Free(); +end; + +end. diff --git a/src/lib/freetype/demo/nehe/lesson43.bdsproj b/src/lib/freetype/demo/nehe/lesson43.bdsproj new file mode 100644 index 00000000..9d3851c4 --- /dev/null +++ b/src/lib/freetype/demo/nehe/lesson43.bdsproj @@ -0,0 +1,175 @@ +<?xml version="1.0" encoding="utf-8"?>
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diff --git a/src/lib/freetype/demo/nehe/lesson43.dpr b/src/lib/freetype/demo/nehe/lesson43.dpr new file mode 100644 index 00000000..fe296fb5 --- /dev/null +++ b/src/lib/freetype/demo/nehe/lesson43.dpr @@ -0,0 +1,289 @@ +program lesson43; +(* + * This code was created by Jeff Molofee '99 + * (ported to Linux/SDL by Ti Leggett '01) + * + * If you've found this code useful, please let me know. + * + * Visit Jeff at http://nehe.gamedev.net/ + * + * or for port-specific comments, questions, bugreports etc. + * email to leggett@eecs.tulane.edu + *) + +{$IFDEF FPC} + {$mode delphi}{$H+} +{$ENDIF} + +{$APPTYPE Console} + +uses + moduleloader in '../../../JEDI-SDL/SDL/Pas/moduleloader.pas', + SDL in '../../../JEDI-SDL/SDL/Pas/sdl.pas', + gl in '../../../JEDI-SDL/OpenGL/Pas/gl.pas', + glu in '../../../JEDI-SDL/OpenGL/Pas/glu.pas', + ctypes in '../../../ctypes/ctypes.pas', + FreeType in '../../freetype.pas', + UFreeType in 'UFreeType.pas', + math, + sysutils; + +const + // screen width, height, and bit depth + SCREEN_WIDTH = 640; + SCREEN_HEIGHT = 480; + SCREEN_BPP = 16; + +var + our_font: TFontData; + // This is our SDL surface + surface: PSDL_Surface; + cnt1, cnt2: GLfloat; + +(* function to release/destroy our resources and restoring the old desktop *) +procedure Quit(returnCode: integer); +begin + // clean up the window + SDL_Quit( ); + + // and exit appropriately + Halt( returnCode ); +end; + +(* function to reset our viewport after a window resize *) +function resizeWindow(width: integer; height: integer): boolean; +var + // Height / width ration + ratio: GLfloat; +begin + // Protect against a divide by zero + if ( height = 0 ) then + height := 1; + + ratio := width / height; + + // Setup our viewport. + glViewport( 0, 0, GLsizei(width), GLsizei(height) ); + + // change to the projection matrix and set our viewing volume. + glMatrixMode( GL_PROJECTION ); + glLoadIdentity( ); + + // Set our perspective + gluPerspective( 45.0, ratio, 0.1, 100.0 ); + + // Make sure we're chaning the model view and not the projection + glMatrixMode( GL_MODELVIEW ); + + // Reset The View + glLoadIdentity( ); + + Result := true; +end; + +(* function to handle key press events *) +procedure handleKeyPress(keysym: PSDL_keysym); +begin + case ( keysym^.sym ) of + SDLK_ESCAPE: + begin + // ESC key was pressed + Quit( 0 ); + end; + SDLK_F1: + begin + // F1 key was pressed + // this toggles fullscreen mode + SDL_WM_ToggleFullScreen( surface ); + end; + end; +end; + +(* general OpenGL initialization function *) +function initGL(): boolean; +begin + // Enable smooth shading + glShadeModel( GL_SMOOTH ); + + // Set the background black + glClearColor( 0.0, 0.0, 0.0, 0.0 ); + + // Depth buffer setup + glClearDepth( 1.0 ); + + // Enables Depth Testing + glEnable( GL_DEPTH_TEST ); + + // The Type Of Depth Test To Do + glDepthFunc( GL_LEQUAL ); + + // Really Nice Perspective Calculations + glHint( GL_PERSPECTIVE_CORRECTION_HINT, GL_NICEST ); + + our_font := TFontData.Create('Test.ttf', 16); + + Result := true; +end; + +(* Here goes our drawing code *) +function drawGLScene(): boolean; +begin + glClear(GL_COLOR_BUFFER_BIT or GL_DEPTH_BUFFER_BIT); // Clear Screen And Depth Buffer + glLoadIdentity(); // Reset The Current Modelview Matrix + glTranslatef(0.0, 0.0, -1.0); // Move One Unit Into The Screen + + // Blue Text + glColor3ub(0, 0, $ff); + + // Position The WGL Text On The Screen + glRasterPos2f(-0.40, 0.35); + + // Here We Print Some Text Using Our FreeType Font + // The only really important command is the actual print() call, + // but for the sake of making the results a bit more interesting + // I have put in some code to rotate and scale the text. + + // Red text + glColor3ub($ff, 0, 0); + + glPushMatrix(); + glLoadIdentity(); + glRotatef(cnt1, 0, 0,1); + glScalef(1, 0.8 + 0.3*cos(cnt1/5) ,1); + glTranslatef(-180, 0, 0); + TFreeType.print(our_font, 320, 240, 'Active FreeType Text - ' + FloatToStr(cnt1)); + glPopMatrix(); + + //Uncomment this to test out print's ability to handle newlines. + //TFreeType.print(our_font, 320, 200, 'Here'#13'there'#13'be'#13#13'newlines'#13'.'); + + cnt1 := cnt1 + 0.051; // Increase The First Counter + cnt2 := cnt2 + 0.005; // Increase The First Counter + + SDL_GL_SwapBuffers( ); + + Result := true; +end; + +var + // Flags to pass to SDL_SetVideoMode + videoFlags: integer; + // main loop variable + done: boolean = false; + // used to collect events + event: TSDL_Event; + // this holds some info about our display + videoInfo: PSDL_VideoInfo; + // whether or not the window is active + isActive: boolean = true; + +begin + // initialize SDL + if ( SDL_Init( SDL_INIT_VIDEO ) < 0 ) then + begin + writeln( ErrOutput, 'Video initialization failed: ' + SDL_GetError() ); + Quit( 1 ); + end; + + // Fetch the video info + videoInfo := SDL_GetVideoInfo( ); + + if ( videoInfo = nil ) then + begin + writeln( ErrOutput, 'Video query failed: ' + SDL_GetError() ); + Quit( 1 ); + end; + + SDL_GL_SetAttribute( SDL_GL_DOUBLEBUFFER, 1 ); // Enable double buffering + + // the flags to pass to SDL_SetVideoMode + videoFlags := SDL_OPENGL; // Enable OpenGL in SDL + videoFlags := videoFlags or SDL_HWPALETTE; // Store the palette in hardware + videoFlags := videoFlags or SDL_RESIZABLE; // Enable window resizing + + // This checks to see if surfaces can be stored in memory + if ( videoInfo^.hw_available <> 0 ) then + videoFlags := videoFlags or SDL_HWSURFACE + else + videoFlags := videoFlags or SDL_SWSURFACE; + + // This checks if hardware blits can be done + if ( videoInfo^.blit_hw <> 0 ) then + videoFlags := videoFlags or SDL_HWACCEL; + + // Sets up OpenGL double buffering + SDL_GL_SetAttribute( SDL_GL_DOUBLEBUFFER, 1 ); + + // get a SDL surface + surface := SDL_SetVideoMode( SCREEN_WIDTH, SCREEN_HEIGHT, SCREEN_BPP, + videoFlags ); + + // Verify there is a surface + if ( surface = nil ) then + begin + writeln( ErrOutput, 'Video mode set failed: ' + SDL_GetError() ); + Quit( 1 ); + end; + + // initialize OpenGL + initGL(); + + // resize the initial window + resizeWindow( SCREEN_WIDTH, SCREEN_HEIGHT ); + + // wait for events + while ( not done ) do + begin + { handle the events in the queue } + + while ( SDL_PollEvent( @event ) <> 0 ) do + begin + case( event.type_ ) of + SDL_ACTIVEEVENT: + begin + // Something's happend with our focus + // If we are iconified, we shouldn't draw the screen + if ( (event.active.state and SDL_APPACTIVE) <> 0 ) then + begin + if ( event.active.gain = 0 ) then + isActive := false + else + isActive := true; + end; + end; + SDL_VIDEORESIZE: + begin + // handle resize event + {$IFDEF UNIX} + surface := SDL_SetVideoMode( event.resize.w, + event.resize.h, + 16, videoFlags ); + if ( surface = nil ) then + begin + writeln( ErrOutput, 'Could not get a surface after resize: ' + SDL_GetError( ) ); + Quit( 1 ); + end; + {$ENDIF} + resizeWindow( event.resize.w, event.resize.h ); + end; + SDL_KEYDOWN: + begin + // handle key presses + handleKeyPress( @event.key.keysym ); + end; + SDL_QUITEV: + begin + // handle quit requests + done := true; + end; + end; + end; + + // draw the scene + if ( isActive ) then + drawGLScene( ); + end; + + // clean ourselves up and exit + Quit( 0 ); +end. diff --git a/src/lib/freetype/demo/nehe/readme.txt b/src/lib/freetype/demo/nehe/readme.txt new file mode 100644 index 00000000..1186ef0e --- /dev/null +++ b/src/lib/freetype/demo/nehe/readme.txt @@ -0,0 +1,9 @@ +Pascal conversion of the NeHe tutorial lesson 43 (Tutorial on using FreeType Fonts in OpenGL) +http://nehe.gamedev.net/data/lessons/lesson.asp?lesson=43 + +Put the following DLLs into this directory: +- libfreetype-6.dll +- SDL.dll +- zlib1.dll + +and copy a TrueType font to this directory and rename it into "Test.ttf". diff --git a/src/lib/freetype/demo/switches.inc b/src/lib/freetype/demo/switches.inc new file mode 100644 index 00000000..0a940004 --- /dev/null +++ b/src/lib/freetype/demo/switches.inc @@ -0,0 +1 @@ +{$DEFINE FREETYPE_DEMO} |