dlls/gdi32/opengl.c

   1 /*
   2  * OpenGL function forwarding to the display driver
   3  *
   4  * Copyright (c) 1999 Lionel Ulmer
   5  * Copyright (c) 2005 Raphael Junqueira
   6  * Copyright (c) 2006 Roderick Colenbrander
   7  *
   8  * This library is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU Lesser General Public
  10  * License as published by the Free Software Foundation; either
  11  * version 2.1 of the License, or (at your option) any later version.
  12  *
  13  * This library is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16  * Lesser General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU Lesser General Public
  19  * License along with this library; if not, write to the Free Software
  20  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  21  */
  22
  23 #include <stdarg.h>
  24 #include <string.h>
  25 #include <stdlib.h>
  26
  27 #include "windef.h"
  28 #include "winbase.h"
  29 #include "wingdi.h"
  30 #include "winerror.h"
  31 #include "winternl.h"
  32 #include "winnt.h"
  33
  34
  35 static HMODULE opengl32;
  36 static INT (WINAPI *wglChoosePixelFormat)(HDC,const PIXELFORMATDESCRIPTOR *);
  37 static INT (WINAPI *wglDescribePixelFormat)(HDC,INT,UINT,PIXELFORMATDESCRIPTOR*);
  38 static INT (WINAPI *wglGetPixelFormat)(HDC);
  39 static BOOL (WINAPI *wglSetPixelFormat)(HDC,INT,const PIXELFORMATDESCRIPTOR*);
  40 static BOOL (WINAPI *wglSwapBuffers)(HDC);
  41
  42 /******************************************************************************
  43  *              ChoosePixelFormat (GDI32.@)
  44  */
  45 INT WINAPI ChoosePixelFormat( HDC hdc, const PIXELFORMATDESCRIPTOR *pfd )
  46 {
  47     if (!wglChoosePixelFormat)
  48     {
  49         if (!opengl32) opengl32 = LoadLibraryW( L"opengl32.dll" );
  50         if (!(wglChoosePixelFormat = (void *)GetProcAddress( opengl32, "wglChoosePixelFormat" )))
  51             return 0;
  52     }
  53     return wglChoosePixelFormat( hdc, pfd );
  54 }
  55
  56 /******************************************************************************
  57  *              DescribePixelFormat (GDI32.@)
  58  */
  59 INT WINAPI DescribePixelFormat( HDC hdc, INT fmt, UINT size, PIXELFORMATDESCRIPTOR *pfd )
  60 {
  61     if (!wglDescribePixelFormat)
  62     {
  63         if (!opengl32) opengl32 = LoadLibraryW( L"opengl32.dll" );
  64         if (!(wglDescribePixelFormat = (void *)GetProcAddress( opengl32, "wglDescribePixelFormat" )))
  65             return 0;
  66     }
  67     return wglDescribePixelFormat( hdc, fmt, size, pfd );
  68 }
  69
  70 /******************************************************************************
  71  *              GetPixelFormat (GDI32.@)
  72  */
  73 INT WINAPI GetPixelFormat( HDC hdc )
  74 {
  75     if (!wglGetPixelFormat)
  76     {
  77         if (!opengl32) opengl32 = LoadLibraryW( L"opengl32.dll" );
  78         if (!(wglGetPixelFormat = (void *)GetProcAddress( opengl32, "wglGetPixelFormat" )))
  79             return 0;
  80     }
  81     return wglGetPixelFormat( hdc );
  82 }
  83
  84 /******************************************************************************
  85  *              SetPixelFormat (GDI32.@)
  86  */
  87 BOOL WINAPI SetPixelFormat( HDC hdc, INT fmt, const PIXELFORMATDESCRIPTOR *pfd )
  88 {
  89     if (!wglSetPixelFormat)
  90     {
  91         if (!opengl32) opengl32 = LoadLibraryW( L"opengl32.dll" );
  92         if (!(wglSetPixelFormat = (void *)GetProcAddress( opengl32, "wglSetPixelFormat" )))
  93             return FALSE;
  94     }
  95     return wglSetPixelFormat( hdc, fmt, pfd );
  96 }
  97
  98 /******************************************************************************
  99  *              SwapBuffers (GDI32.@)
 100  */
 101 BOOL WINAPI SwapBuffers( HDC hdc )
 102 {
 103     if (!wglSwapBuffers)
 104     {
 105         if (!opengl32) opengl32 = LoadLibraryW( L"opengl32.dll" );
 106         if (!(wglSwapBuffers = (void *)GetProcAddress( opengl32, "wglSwapBuffers" )))
 107             return FALSE;
 108     }
 109     return wglSwapBuffers( hdc );
 110 }