src/glx/apple/apple_glapi.c

   1 /*
   2  * GLX implementation that uses Apple's OpenGL.framework
   3  *
   4  * Copyright (c) 2007-2011 Apple Inc.
   5  * Copyright (c) 2004 Torrey T. Lyons. All Rights Reserved.
   6  * Copyright (c) 2002 Greg Parker. All Rights Reserved.
   7  *
   8  * Portions of this file are copied from Mesa's xf86glx.c,
   9  * which contains the following copyright:
  10  *
  11  * Copyright 1998-1999 Precision Insight, Inc., Cedar Park, Texas.
  12  * All Rights Reserved.
  13  *
  14  * Permission is hereby granted, free of charge, to any person obtaining a
  15  * copy of this software and associated documentation files (the "Software"),
  16  * to deal in the Software without restriction, including without limitation
  17  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  18  * and/or sell copies of the Software, and to permit persons to whom the
  19  * Software is furnished to do so, subject to the following conditions:
  20  *
  21  * The above copyright notice and this permission notice shall be included in
  22  * all copies or substantial portions of the Software.
  23  *
  24  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  25  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  26  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  27  * THE ABOVE LISTED COPYRIGHT HOLDER(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
  28  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  29  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  30  * DEALINGS IN THE SOFTWARE.
  31  */
  32
  33 #include <assert.h>
  34 #include <dlfcn.h>
  35 #include <stdlib.h>
  36 #include <string.h>
  37 #include <stdio.h>
  38
  39 #include <GL/gl.h>
  40
  41 #include "glapi.h"
  42 #include "glapitable.h"
  43 #include "main/dispatch.h"
  44
  45 #include "apple_glx.h"
  46 #include "apple_xgl_api.h"
  47
  48 #ifndef OPENGL_FRAMEWORK_PATH
  49 #define OPENGL_FRAMEWORK_PATH "/System/Library/Frameworks/OpenGL.framework/OpenGL"
  50 #endif
  51
  52 struct _glapi_table * __ogl_framework_api = NULL;
  53 struct _glapi_table * __applegl_api = NULL;
  54
  55 void apple_glapi_set_dispatch(void) {
  56     static void *handle;
  57     const char *opengl_framework_path;
  58
  59     if(__applegl_api)  {
  60         _glapi_set_dispatch(__applegl_api);
  61         return;
  62     }
  63
  64     opengl_framework_path = getenv("OPENGL_FRAMEWORK_PATH");
  65     if (!opengl_framework_path) {
  66         opengl_framework_path = OPENGL_FRAMEWORK_PATH;
  67     }
  68
  69     (void) dlerror();            /*drain dlerror */
  70     handle = dlopen(opengl_framework_path, RTLD_LOCAL);
  71
  72     if (!handle) {
  73         fprintf(stderr, "error: unable to dlopen %s : %s\n",
  74                 opengl_framework_path, dlerror());
  75         abort();
  76     }
  77
  78     __ogl_framework_api = _glapi_create_table_from_handle(handle, "gl");
  79     assert(__ogl_framework_api);
  80
  81     __applegl_api = malloc(sizeof(struct _glapi_table));
  82     assert(__applegl_api);
  83     memcpy(__applegl_api, __ogl_framework_api, sizeof(struct _glapi_table));
  84
  85     SET_ReadPixels(__applegl_api, __applegl_glReadPixels);
  86     SET_CopyPixels(__applegl_api, __applegl_glCopyPixels);
  87     SET_CopyColorTable(__applegl_api, __applegl_glCopyColorTable);
  88     SET_DrawBuffer(__applegl_api, __applegl_glDrawBuffer);
  89     SET_DrawBuffersARB(__applegl_api, __applegl_glDrawBuffersARB);
  90     SET_Viewport(__applegl_api, __applegl_glViewport);
  91
  92     _glapi_set_dispatch(__applegl_api);
  93 }