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311 lines
7.1 KiB
Plaintext
311 lines
7.1 KiB
Plaintext
{
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$Id$
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Translation of the Mesa GL headers for FreePascal
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Copyright (C) 1999 Sebastian Guenther
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Mesa 3-D graphics library
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Version: 3.0
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Copyright (C) 1995-1998 Brian Paul
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public
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License as published by the Free Software Foundation; either
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version 2 of the License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with this library; if not, write to the Free
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Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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}
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{$MODE delphi} // objfpc would not work because of direct proc var assignments
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{You have to enable Macros (compiler switch "-Sm") for compiling this unit!
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This is necessary for supporting different platforms with different calling
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conventions via a single unit.}
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unit GL;
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interface
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{$DEFINE GL1_0}
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{$DEFINE GL1_1}
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{$DEFINE GL1_2}
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{$DEFINE MESA} {enable if you want to use some special mesa extensions}
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{$DEFINE EXTENSIONS} {enable if you need one/all of extensions}
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{$DEFINE SGI_EXTENSIONS} {enable if you need one/all of extensions}
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{$MACRO ON}
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{$IFDEF Linux}
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{$LINKLIB c}
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{$ELSE}
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{$MESSAGE Unsupported platform.}
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{$ENDIF}
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// =======================================================
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// Unit specific extensions
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// =======================================================
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function InitGLFromLibrary(libname: PChar): Boolean;
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// determines automatically which libraries to use:
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function InitGL: Boolean;
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var
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GLDumpUnresolvedFunctions,
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GLInitialized: Boolean;
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// =======================================================
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// GL consts, types and functions
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// =======================================================
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// -------------------------------------------------------
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// GL types
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// -------------------------------------------------------
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type
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PSingle = ^Single;
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PDouble = ^Double;
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GLvoid = Pointer;
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GLboolean = Byte;
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GLbyte = ShortInt; // 1-byte signed
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GLshort = Integer; // 2-byte signed
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GLint = LongInt; // 4-byte signed
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GLubyte = Byte; // 1-byte unsigned
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GLushort = Word; // 2-byte unsigned
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GLuint = DWord; // 4-byte signed
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GLsizei = LongInt; // 4-byte signed
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GLfloat = Single; // single precision float
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GLclampf = Single; // single precision float in [0,1]
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GLdouble = Double; // double precision float
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GLclampd = Double; // double precision float in [0,1]
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GLenum = DWord;
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PGLBoolean = ^GLBoolean;
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PGLFloat = ^GLfloat;
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PGLDouble = ^GLDouble;
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type
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GLbitfield = DWord; { was an enum - no corresponding thing in pascal }
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const
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GL_CURRENT_BIT = $00000001;
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GL_POINT_BIT = $00000002;
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GL_LINE_BIT = $00000004;
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GL_POLYGON_BIT = $00000008;
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GL_POLYGON_STIPPLE_BIT= $00000010;
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GL_PIXEL_MODE_BIT = $00000020;
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GL_LIGHTING_BIT = $00000040;
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GL_FOG_BIT = $00000080;
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GL_DEPTH_BUFFER_BIT = $00000100;
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GL_ACCUM_BUFFER_BIT = $00000200;
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GL_STENCIL_BUFFER_BIT = $00000400;
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GL_VIEWPORT_BIT = $00000800;
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GL_TRANSFORM_BIT = $00001000;
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GL_ENABLE_BIT = $00002000;
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GL_COLOR_BUFFER_BIT = $00004000;
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GL_HINT_BIT = $00008000;
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GL_EVAL_BIT = $00010000;
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GL_LIST_BIT = $00020000;
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GL_TEXTURE_BIT = $00040000;
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GL_SCISSOR_BIT = $00080000;
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GL_ALL_ATTRIB_BITS = $000fffff;
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// -------------------------------------------------------
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// GL constants
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// -------------------------------------------------------
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{$IFDEF GL1_0}
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%GLDeclsIF10
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{$ENDIF GL1_0}
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{$IFDEF GL1_1}
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%GLDeclsIF11
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{$ENDIF GL1_1}
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{$IFDEF GL1_2}
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%GLDeclsIF12
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{$ENDIF GL1_2}
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const
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// Utility
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GL_VENDOR = $1F00;
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GL_RENDERER = $1F01;
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GL_VERSION = $1F02;
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GL_EXTENSIONS = $1F03;
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// Errors
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GL_INVALID_VALUE = $0501;
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GL_INVALID_ENUM = $0500;
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GL_INVALID_OPERATION = $0502;
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GL_STACK_OVERFLOW = $0503;
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GL_STACK_UNDERFLOW = $0504;
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GL_OUT_OF_MEMORY = $0505;
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// -------------------------------------------------------
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// GL extensions constants
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// -------------------------------------------------------
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{$IFDEF EXTENSIONS}
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%GLDeclsIF10Ext
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{$ENDIF EXTENSIONS}
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{$IFDEF SGI_EXTENSIONS}
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%GLDeclsIF10SGI
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{$ENDIF SGI_EXTENSIONS}
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{$IFDEF MESA}
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%GLDeclsIF10Mesa
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{$ENDIF MESA}
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// -------------------------------------------------------
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// GL procedures and functions
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// -------------------------------------------------------
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{$IFDEF GL1_0}
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var
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%GLProcsPD10
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{$ENDIF GL1_0}
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{$IFDEF GL1_1}
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var
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%GLProcsPD11
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{$ENDIF GL1_1}
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{$IFDEF GL1_2}
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var
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%GLProcsPD12
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{$ENDIF GL1_2}
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// -------------------------------------------------------
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// GL Extensions
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// -------------------------------------------------------
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{$IFDEF EXTENSIONS}
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var
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%GLProcsPD10Ext
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{$ENDIF EXTENSIONS}
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// library dependent extensions
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{$IFDEF SGI_EXTENSIONS}
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var
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%GLProcsPD10SGI
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{$ENDIF SGI_EXTENSIONS}
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{$ifdef MESA}
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var
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%GLProcsPD10Mesa
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{$endif MESA}
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// =======================================================
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// =======================================================
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implementation
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{$LINKLIB m}
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function dlopen(AFile: PChar; mode: LongInt): Pointer; external 'dl';
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function dlclose(handle: Pointer): LongInt; external 'dl';
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function dlsym(handle: Pointer; name: PChar): Pointer; external 'dl';
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function LoadLibrary(name: PChar): Pointer;
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begin
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Result := dlopen(name, $101 {RTLD_GLOBAL or RTLD_LAZY});
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end;
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function GetProc(handle: Pointer; name: PChar): Pointer;
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begin
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Result := dlsym(handle, name);
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if (Result = nil) and GLDumpUnresolvedFunctions then
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WriteLn('Unresolved: ', name);
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end;
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var
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libGL : Pointer;
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function InitGLFromLibrary(libname: PChar): Boolean;
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begin
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Result := False;
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libGL := LoadLibrary(libname);
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if not Assigned(libGL) then exit;
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{$ifdef GL1_0}
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%GLProcsPL10
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{$endif GL1_0}
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{$ifdef GL1_1}
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%GLProcsPL11
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{$endif GL1_1}
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{$ifdef GL1_2}
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%GLProcsPL12
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{$endif GL1_2}
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{$ifdef EXTENSIONS}
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%GLProcsPL10Ext
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{$endif EXTENSIONS}
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{$ifdef SGI_EXTENSIONS}
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%GLProcsPL10SGI
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{$endif SGI_EXTENSIONS}
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{$ifdef MESA}
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%GLProcsPL10Mesa
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{$endif MESA}
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GLInitialized := True;
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Result := True;
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end;
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function InitGL: Boolean;
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begin
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Result := InitGLFromLibrary('libGL.so') or
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InitGLFromLibrary('libGL.so.1') or
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InitGLFromLibrary('libMesaGL.so') or
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InitGLFromLibrary('libMesaGL.so.3');
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end;
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initialization
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InitGL;
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finalization
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if Assigned(libGL) then dlclose(libGL);
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end.
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{
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$Log$
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Revision 1.1 2000-09-03 21:25:45 peter
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* new updated version
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* gtkglarea unit and demo
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* win32 opengl headers
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* morph3d demo
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Revision 1.1 2000/07/13 06:34:17 michael
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+ Initial import
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Revision 1.2 2000/05/31 00:34:28 alex
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made templates work
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}
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