apple_glapi.c revision a128355ecb5b782a69461a04991e4cffb32249db 
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
52struct _glapi_table * __ogl_framework_api = NULL;
53struct _glapi_table * __applegl_api = NULL;
54
55void 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}
94