1 /**************************************************************************
3 * Copyright 2011 Jose Fonseca
6 * Permission is hereby granted, free of charge, to any person obtaining a copy
7 * of this software and associated documentation files (the "Software"), to deal
8 * in the Software without restriction, including without limitation the rights
9 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
10 * copies of the Software, and to permit persons to whom the Software is
11 * furnished to do so, subject to the following conditions:
13 * The above copyright notice and this permission notice shall be included in
14 * all copies or substantial portions of the Software.
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
19 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
21 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
24 **************************************************************************/
31 #include <unistd.h> // for symlink
37 * Handle to the true OpenGL library.
40 HMODULE _libGlHandle = NULL;
42 void *_libGlHandle = NULL;
50 _getPublicProcAddress(const char *procName)
53 char szDll[MAX_PATH] = {0};
55 if (!GetSystemDirectoryA(szDll, MAX_PATH)) {
59 strcat(szDll, "\\\\opengl32.dll");
61 _libGlHandle = LoadLibraryA(szDll);
63 os::log("apitrace: error: couldn't load %s\n", szDll);
68 return (void *)GetProcAddress(_libGlHandle, procName);
73 _getPrivateProcAddress(const char *procName) {
74 return (void *)_wglGetProcAddress(procName);
78 #elif defined(__APPLE__)
82 * Path to the true OpenGL framework
84 static const char *libgl_filename = "/System/Library/Frameworks/OpenGL.framework/OpenGL";
88 * Lookup a libGL symbol
90 void * _libgl_sym(const char *symbol)
96 * Unfortunately we can't just dlopen the true dynamic library because
97 * DYLD_LIBRARY_PATH/DYLD_FRAMEWORK_PATH take precedence, even for
98 * absolute paths. So we create a temporary symlink, and dlopen that
102 char temp_filename[] = "/tmp/tmp.XXXXXX";
104 if (mktemp(temp_filename) != NULL) {
105 if (symlink(libgl_filename, temp_filename) == 0) {
106 _libGlHandle = dlopen(temp_filename, RTLD_LOCAL | RTLD_NOW | RTLD_FIRST);
107 remove(temp_filename);
112 os::log("apitrace: error: couldn't load %s\n", libgl_filename);
118 result = dlsym(_libGlHandle, symbol);
121 if (result && result == dlsym(RTLD_SELF, symbol)) {
122 os::log("apitrace: error: symbol lookup recursion\n");
133 _getPublicProcAddress(const char *procName)
135 return _libgl_sym(procName);
139 _getPrivateProcAddress(const char *procName)
141 return _libgl_sym(procName);
149 * Lookup a libGL symbol
151 void * _libgl_sym(const char *symbol)
157 * The app doesn't directly link against libGL.so, nor does it directly
158 * dlopen it. So we have to load it ourselves.
161 const char * libgl_filename = getenv("TRACE_LIBGL");
163 if (!libgl_filename) {
165 * Try to use whatever libGL.so the library is linked against.
168 result = dlsym(RTLD_NEXT, symbol);
170 _libGlHandle = RTLD_NEXT;
174 libgl_filename = "libGL.so.1";
178 * It would have been preferable to use RTLD_LOCAL to ensure that the
179 * application can never access libGL.so symbols directly, but this
180 * won't work, given libGL.so often loads a driver specific SO and
181 * exposes symbols to it.
184 _libGlHandle = _dlopen(libgl_filename, RTLD_GLOBAL | RTLD_LAZY);
186 os::log("apitrace: error: couldn't find libGL.so\n");
191 return dlsym(_libGlHandle, symbol);
196 _getPublicProcAddress(const char *procName)
198 return _libgl_sym(procName);
202 _getPrivateProcAddress(const char *procName)
204 return (void *)_glXGetProcAddressARB((const GLubyte *)procName);