diff options
Diffstat (limited to 'Game/Code/lib/JEDI-SDL/SDL/Pas/sdlstreams.pas')
| -rw-r--r-- | Game/Code/lib/JEDI-SDL/SDL/Pas/sdlstreams.pas | 216 |
1 files changed, 216 insertions, 0 deletions
diff --git a/Game/Code/lib/JEDI-SDL/SDL/Pas/sdlstreams.pas b/Game/Code/lib/JEDI-SDL/SDL/Pas/sdlstreams.pas new file mode 100644 index 00000000..64009176 --- /dev/null +++ b/Game/Code/lib/JEDI-SDL/SDL/Pas/sdlstreams.pas @@ -0,0 +1,216 @@ +unit sdlstreams;
+{
+ $Id: sdlstreams.pas,v 1.1 2004/02/05 00:08:20 savage Exp $
+
+}
+{******************************************************************}
+{ }
+{ SDL - Simple DirectMedia Layer }
+{ Copyright (C) 1997, 1998, 1999, 2000, 2001 Sam Lantinga }
+{ }
+{ Portions created by Chris Bruner are }
+{ Copyright (C) 2002 Chris Bruner. }
+{ }
+{ Contributor(s) }
+{ -------------- }
+{ }
+{ }
+{ Obtained through: }
+{ Joint Endeavour of Delphi Innovators ( Project JEDI ) }
+{ }
+{ You may retrieve the latest version of this file at the Project }
+{ JEDI home page, located at http://delphi-jedi.org }
+{ }
+{ The contents of this file are used with permission, subject to }
+{ the Mozilla Public License Version 1.1 (the "License"); you may }
+{ not use this file except in compliance with the License. You may }
+{ obtain a copy of the License at }
+{ http://www.mozilla.org/NPL/NPL-1_1Final.html }
+{ }
+{ Software distributed under the License is distributed on an }
+{ "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or }
+{ implied. See the License for the specific language governing }
+{ rights and limitations under the License. }
+{ }
+{ Description }
+{ ----------- }
+{ Shows how to use OpenGL to do 2D and 3D with the SDL libraries }
+{ }
+{ }
+{ Requires }
+{ -------- }
+{ SDL runtime libary somewhere in your path }
+{ The Latest SDL runtime can be found on http://www.libsdl.org }
+{ }
+{ Programming Notes }
+{ ----------------- }
+{ }
+{ }
+{ }
+{ }
+{ }
+{ Revision History }
+{ ---------------- }
+{ January 11 2002 - CB : Software embraced and extended by }
+{ Chris Bruner of Crystal Software }
+{ (Canada) Inc. }
+{ }
+{ February 11 2002 - DL : Added FreePascal support as suggested }
+{ by "QuePasha Pepe" <mrkroket@hotmail.com> }
+{ }
+{******************************************************************}
+{
+ $Log: sdlstreams.pas,v $
+ Revision 1.1 2004/02/05 00:08:20 savage
+ Module 1.0 release
+
+
+}
+
+{$i jedi-sdl.inc}
+
+interface
+
+uses
+ Classes,
+ SysUtils,
+ sdl,
+ sdlutils;
+
+{$IFDEF FPC}
+type
+ EinvalidContainer=class(Exception);
+ {$ENDIF}
+
+function LoadSDLBMPFromStream( Stream : TStream ) : PSDL_Surface;
+procedure SaveSDLBMPToStream( SDL_Surface : PSDL_Surface; stream : TStream );
+function SDL_Swap16( D : UInt16 ) : Uint16;
+function SDL_Swap32( D : UInt32 ) : Uint32;
+function SDLStreamSetup( stream : TStream ) : PSDL_RWops;
+// this only closes the SDL_RWops part of the stream, not the stream itself
+procedure SDLStreamCloseRWops( SDL_RWops : PSDL_RWops );
+
+implementation
+
+function SDL_Swap16( D : UInt16 ) : Uint16;
+begin
+ Result := ( D shl 8 ) or ( D shr 8 );
+end;
+
+function SDL_Swap32( D : UInt32 ) : Uint32;
+begin
+ Result := ( ( D shl 24 ) or ( ( D shl 8 ) and $00FF0000 ) or ( ( D shr 8 ) and $0000FF00 ) or ( D shr 24 ) );
+end;
+
+(*function SDL_Swap64(D : UInt64) : Uint64;
+var hi,lo : Uint32;
+begin
+ // Separate into high and low 32-bit resultues and swap them
+ lo := Uint32(D and $0FFFFFFFF); // bloody pascal is too tight in it's type checking!
+ D := D shr 32;
+ hi = Uint32((D and $FFFFFFFF));
+ result = SDL_Swap32(lo);
+ result := result shl 32;
+ result := result or SDL_Swap32(hi);
+end;
+*)
+
+function SdlStreamSeek( context : PSDL_RWops; offset : Integer; whence : Integer ) : integer; cdecl;
+var
+ stream : TStream;
+ origin : Word;
+begin
+ stream := TStream( context.unknown );
+ if ( stream = nil ) then
+ raise EInvalidContainer.Create( 'SDLStreamSeek on nil' );
+ case whence of
+ 0 : origin := soFromBeginning; // Offset is from the beginning of the resource. Seek moves to the position Offset. Offset must be >= 0.
+ 1 : origin := soFromCurrent; // Offset is from the current position in the resource. Seek moves to Position + Offset.
+ 2 : origin := soFromEnd;
+ else
+ origin := soFromBeginning; // just in case
+ end;
+ Result := stream.Seek( offset, origin );
+end;
+
+function SDLStreamWrite( context : PSDL_RWops; Ptr : Pointer;
+ size : Integer; num : Integer ) : Integer; cdecl;
+var
+ stream : TStream;
+begin
+ stream := TStream( context.unknown );
+ if ( stream = nil ) then
+ raise EInvalidContainer.Create( 'SDLStreamWrite on nil' );
+ try
+ Result := stream.Write( Ptr^, Size * num ) div size;
+ except
+ Result := -1;
+ end;
+end;
+
+function SdlStreamRead( context : PSDL_RWops; Ptr : Pointer; size : Integer; maxnum
+ : Integer ) : Integer; cdecl;
+var
+ stream : TStream;
+begin
+ stream := TStream( context.unknown );
+ if ( stream = nil ) then
+ raise EInvalidContainer.Create( 'SDLStreamRead on nil' );
+ try
+ Result := stream.read( Ptr^, Size * maxnum ) div size;
+ except
+ Result := -1;
+ end;
+end;
+
+function SDLStreamClose( context : PSDL_RWops ) : Integer; cdecl;
+var
+ stream : TStream;
+begin
+ stream := TStream( context.unknown );
+ if ( stream = nil ) then
+ raise EInvalidContainer.Create( 'SDLStreamClose on nil' );
+ stream.Free;
+ Result := 1;
+end;
+
+function SDLStreamSetup( stream : TStream ) : PSDL_RWops;
+begin
+ result := SDL_AllocRW;
+ if ( result = nil ) then
+ raise EInvalidContainer.Create( 'could not create SDLStream on nil' );
+ result.unknown := TUnknown( stream );
+ result.seek := SDLStreamSeek;
+ result.read := SDLStreamRead;
+ result.write := SDLStreamWrite;
+ result.close := SDLStreamClose;
+ Result.type_ := 2; // TUnknown
+end;
+
+// this only closes the SDL part of the stream, not the context
+
+procedure SDLStreamCloseRWops( SDL_RWops : PSDL_RWops );
+begin
+ SDL_FreeRW( SDL_RWops );
+end;
+
+function LoadSDLBMPFromStream( stream : TStream ) : PSDL_Surface;
+var
+ SDL_RWops : PSDL_RWops;
+begin
+ SDL_RWops := SDLStreamSetup( stream );
+ result := SDL_LoadBMP_RW( SDL_RWops, 0 );
+ SDLStreamCloseRWops( SDL_RWops );
+end;
+
+procedure SaveSDLBMPToStream( SDL_Surface : PSDL_Surface; stream : TStream );
+var
+ SDL_RWops : PSDL_RWops;
+begin
+ SDL_RWops := SDLStreamSetup( stream );
+ SDL_SaveBMP_RW( SDL_Surface, SDL_RWops, 0 );
+ SDLStreamCloseRWops( SDL_RWops );
+end;
+
+end.
+
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