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 "config.h"
  24 #include "wine/port.h"
  25
  26 #include <stdarg.h>
  27 #include <string.h>
  28 #include <stdlib.h>
  29
  30 #include "windef.h"
  31 #include "winbase.h"
  32 #include "wingdi.h"
  33 #include "winerror.h"
  34 #include "winternl.h"
  35 #include "winnt.h"
  36 #include "gdi_private.h"
  37 #include "wine/debug.h"
  38
  39 WINE_DEFAULT_DEBUG_CHANNEL(wgl);
  40
  41 static const WCHAR opengl32W[] = {'o','p','e','n','g','l','3','2','.','d','l','l',0};
  42 static HMODULE opengl32;
  43 static INT (WINAPI *wglChoosePixelFormat)(HDC,const PIXELFORMATDESCRIPTOR *);
  44 static INT (WINAPI *wglDescribePixelFormat)(HDC,INT,UINT,PIXELFORMATDESCRIPTOR*);
  45 static BOOL (WINAPI *wglSetPixelFormat)(HDC,INT,const PIXELFORMATDESCRIPTOR*);
  46 static BOOL (WINAPI *wglSwapBuffers)(HDC);
  47
  48 static HDC default_hdc = 0;
  49
  50 /* We route all wgl functions from opengl32.dll through gdi32.dll to
  51  * the display driver. Various wgl calls have a hDC as one of their parameters.
  52  * Using get_dc_ptr we get access to the functions exported by the driver.
  53  * Some functions don't receive a hDC. This function creates a global hdc and
  54  * if there's already a global hdc, it returns it.
  55  */
  56 static DC* OPENGL_GetDefaultDC(void)
  57 {
  58     if(!default_hdc)
  59         default_hdc = CreateDCA("DISPLAY", NULL, NULL, NULL);
  60
  61     return get_dc_ptr(default_hdc);
  62 }
  63
  64 /***********************************************************************
  65  *              Internal wglGetProcAddress for retrieving WGL extensions
  66  */
  67 PROC WINAPI wglGetProcAddress(LPCSTR func)
  68 {
  69     PROC ret = NULL;
  70     DC *dc;
  71
  72     if(!func)
  73         return NULL;
  74
  75     TRACE("func: '%s'\n", func);
  76
  77     /* Retrieve the global hDC to get access to the driver.  */
  78     dc = OPENGL_GetDefaultDC();
  79     if (dc)
  80     {
  81         PHYSDEV physdev = GET_DC_PHYSDEV( dc, pwglGetProcAddress );
  82         ret = physdev->funcs->pwglGetProcAddress(func);
  83         release_dc_ptr( dc );
  84     }
  85     return ret;
  86 }
  87
  88 /***********************************************************************
  89  *      __wine_get_wgl_driver  (GDI32.@)
  90  */
  91 const struct wgl_funcs * CDECL __wine_get_wgl_driver( HDC hdc, UINT version )
  92 {
  93     const struct wgl_funcs *ret = NULL;
  94     DC * dc = get_dc_ptr( hdc );
  95
  96     if (dc)
  97     {
  98         PHYSDEV physdev = GET_DC_PHYSDEV( dc, wine_get_wgl_driver );
  99         ret = physdev->funcs->wine_get_wgl_driver( physdev, version );
 100         release_dc_ptr( dc );
 101     }
 102     return ret;
 103 }
 104
 105 /******************************************************************************
 106  *              ChoosePixelFormat (GDI32.@)
 107  */
 108 INT WINAPI ChoosePixelFormat( HDC hdc, const PIXELFORMATDESCRIPTOR *pfd )
 109 {
 110     if (!wglChoosePixelFormat)
 111     {
 112         if (!opengl32) opengl32 = LoadLibraryW( opengl32W );
 113         if (!(wglChoosePixelFormat = (void *)GetProcAddress( opengl32, "wglChoosePixelFormat" )))
 114             return 0;
 115     }
 116     return wglChoosePixelFormat( hdc, pfd );
 117 }
 118
 119 /******************************************************************************
 120  *              DescribePixelFormat (GDI32.@)
 121  */
 122 INT WINAPI DescribePixelFormat( HDC hdc, INT fmt, UINT size, PIXELFORMATDESCRIPTOR *pfd )
 123 {
 124     if (!wglDescribePixelFormat)
 125     {
 126         if (!opengl32) opengl32 = LoadLibraryW( opengl32W );
 127         if (!(wglDescribePixelFormat = (void *)GetProcAddress( opengl32, "wglDescribePixelFormat" )))
 128             return 0;
 129     }
 130     return wglDescribePixelFormat( hdc, fmt, size, pfd );
 131 }
 132
 133 /******************************************************************************
 134  *              SetPixelFormat (GDI32.@)
 135  */
 136 BOOL WINAPI SetPixelFormat( HDC hdc, INT fmt, const PIXELFORMATDESCRIPTOR *pfd )
 137 {
 138     if (!wglSetPixelFormat)
 139     {
 140         if (!opengl32) opengl32 = LoadLibraryW( opengl32W );
 141         if (!(wglSetPixelFormat = (void *)GetProcAddress( opengl32, "wglSetPixelFormat" )))
 142             return 0;
 143     }
 144     return wglSetPixelFormat( hdc, fmt, pfd );
 145 }
 146
 147 /******************************************************************************
 148  *              SwapBuffers (GDI32.@)
 149  */
 150 BOOL WINAPI SwapBuffers( HDC hdc )
 151 {
 152     if (!wglSwapBuffers)
 153     {
 154         if (!opengl32) opengl32 = LoadLibraryW( opengl32W );
 155         if (!(wglSwapBuffers = (void *)GetProcAddress( opengl32, "wglSwapBuffers" )))
 156             return 0;
 157     }
 158     return wglSwapBuffers( hdc );
 159 }