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)
78 * Android does not support LD_PRELOAD. It is assumed that applications
79 * are explicitely loading egltrace.so.
82 if (procName[0] == 'e' && procName[1] == 'g' && procName[2] == 'l') {
83 static void *libEGL = NULL;
85 libEGL = dlopen("libEGL.so", RTLD_LOCAL | RTLD_LAZY);
88 } else if (procName[0] == 'g' && procName[1] == 'l') {
89 /* TODO: Support libGLESv1_CM.so too somehow. */
90 static void *libGLESv2 = NULL;
92 libGLESv2 = dlopen("libGLESv2.so", RTLD_LOCAL | RTLD_LAZY);
97 return dlsym(lib, procName);
101 return dlsym(RTLD_NEXT, procName);
106 * Lookup a private EGL/GL/GLES symbol
108 * Private symbols should always be available through eglGetProcAddress, and
109 * they are guaranteed to work with any context bound (regardless of the API).
111 * However, per issue#57, eglGetProcAddress returns garbage on some
112 * implementations, and the spec states that implementations may choose to also
113 * export extension functions publicly, so we always attempt dlsym before
114 * eglGetProcAddress to mitigate that.
117 __getPrivateProcAddress(const char *procName)
120 proc = __getPublicProcAddress(procName);
122 ((procName[0] == 'e' && procName[1] == 'g' && procName[2] == 'l') ||
123 (procName[0] == 'g' && procName[1] == 'l'))) {
124 proc = (void *) __eglGetProcAddress(procName);