src/gallium/state_trackers/wgl/stw_getprocaddress.c

   1 /**************************************************************************
   2  *
   3  * Copyright 2008 VMware, Inc.
   4  * All Rights Reserved.
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a
   7  * copy of this software and associated documentation files (the
   8  * "Software"), to deal in the Software without restriction, including
   9  * without limitation the rights to use, copy, modify, merge, publish,
  10  * distribute, sub license, and/or sell copies of the Software, and to
  11  * permit persons to whom the Software is furnished to do so, subject to
  12  * the following conditions:
  13  *
  14  * The above copyright notice and this permission notice (including the
  15  * next paragraph) shall be included in all copies or substantial portions
  16  * of the Software.
  17  *
  18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  19  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  20  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
  21  * IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS BE LIABLE FOR
  22  * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
  23  * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
  24  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  25  *
  26  **************************************************************************/
  27
  28 #include <windows.h>
  29
  30 #define WGL_WGLEXT_PROTOTYPES
  31
  32 #include <GL/gl.h>
  33 #include <GL/wglext.h>
  34
  35 #include "glapi/glapi.h"
  36 #include "stw_device.h"
  37 #include "stw_icd.h"
  38 #include "stw_nopfuncs.h"
  39
  40 struct stw_extension_entry
  41 {
  42    const char *name;
  43    PROC proc;
  44 };
  45
  46 #define STW_EXTENSION_ENTRY(P) { #P, (PROC) P }
  47
  48 static const struct stw_extension_entry stw_extension_entries[] = {
  49
  50    /* WGL_ARB_extensions_string */
  51    STW_EXTENSION_ENTRY( wglGetExtensionsStringARB ),
  52
  53    /* WGL_ARB_pbuffer */
  54    STW_EXTENSION_ENTRY( wglCreatePbufferARB ),
  55    STW_EXTENSION_ENTRY( wglGetPbufferDCARB ),
  56    STW_EXTENSION_ENTRY( wglReleasePbufferDCARB ),
  57    STW_EXTENSION_ENTRY( wglDestroyPbufferARB ),
  58    STW_EXTENSION_ENTRY( wglQueryPbufferARB ),
  59
  60    /* WGL_ARB_pixel_format */
  61    STW_EXTENSION_ENTRY( wglChoosePixelFormatARB ),
  62    STW_EXTENSION_ENTRY( wglGetPixelFormatAttribfvARB ),
  63    STW_EXTENSION_ENTRY( wglGetPixelFormatAttribivARB ),
  64
  65    /* WGL_EXT_extensions_string */
  66    STW_EXTENSION_ENTRY( wglGetExtensionsStringEXT ),
  67
  68    /* WGL_EXT_swap_interval */
  69    STW_EXTENSION_ENTRY( wglGetSwapIntervalEXT ),
  70    STW_EXTENSION_ENTRY( wglSwapIntervalEXT ),
  71
  72    /* WGL_ARB_create_context */
  73    STW_EXTENSION_ENTRY( wglCreateContextAttribsARB ),
  74
  75    { NULL, NULL }
  76 };
  77
  78 PROC APIENTRY
  79 DrvGetProcAddress(
  80    LPCSTR lpszProc )
  81 {
  82    const struct stw_extension_entry *entry;
  83    PROC p;
  84
  85    if (!stw_dev)
  86       return NULL;
  87
  88    if (lpszProc[0] == 'w' && lpszProc[1] == 'g' && lpszProc[2] == 'l')
  89       for (entry = stw_extension_entries; entry->name; entry++)
  90          if (strcmp( lpszProc, entry->name ) == 0)
  91             return entry->proc;
  92
  93    if (lpszProc[0] == 'g' && lpszProc[1] == 'l') {
  94       p = (PROC) _glapi_get_proc_address(lpszProc);
  95       if (p)
  96          return p;
  97    }
  98
  99    /* If we get here, we'd normally just return NULL, but since some apps
 100     * (like Viewperf12) crash when they try to use the null pointer, try
 101     * returning a pointer to a no-op function instead.
 102     */
 103    p = stw_get_nop_function(lpszProc);
 104    if (p) {
 105       debug_printf("wglGetProcAddress(\"%s\") returning no-op function\n",
 106                    lpszProc);
 107       return p;
 108    }
 109
 110    debug_printf("wglGetProcAddress(\"%s\") returning NULL\n", lpszProc);
 111    return NULL;
 112 }