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 **************************************************************************/
32 #define _GNU_SOURCE // for dladdr
39 * Handle to the true OpenGL library.
40 * XXX: Not really used yet.
43 HINSTANCE __libGlHandle = NULL;
45 void *__libGlHandle = NULL;
54 #elif defined(__APPLE__)
61 * Lookup a public EGL/GL/GLES symbol
63 * The spec states that eglGetProcAddress should only be used for non-core
64 * (extensions) entry-points. Core entry-points should be taken directly from
65 * the API specific libraries.
67 * We cannot tell here which API a symbol is meant for here (as some are
68 * exported by many). So this code assumes that the appropriate shared
69 * libraries have been loaded previously (either dlopened with RTLD_GLOBAL, or
70 * as part of the executable dependencies), and that their symbols available
71 * for quering via dlsym(RTLD_NEXT, ...).
74 __getPublicProcAddress(const char *procName)
76 return dlsym(RTLD_NEXT, procName);
80 * Lookup a private EGL/GL/GLES symbol
82 * Private symbols should always be available through eglGetProcAddress, and
83 * they are guaranteed to work with any context bound (regardless of the API).
85 * However, per issue#57, eglGetProcAddress returns garbage on some
86 * implementations, and the spec states that implementations may choose to also
87 * export extension functions publicly, so we always attempt dlsym before
88 * eglGetProcAddress to mitigate that.
91 __getPrivateProcAddress(const char *procName)
94 proc = dlsym(RTLD_NEXT, procName);
95 if (!proc && procName[0] == 'g' && procName[1] == 'l')
96 proc = (void *) __eglGetProcAddress(procName);