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 **************************************************************************/
36 * Handle to the true OpenGL library.
37 * XXX: Not really used yet.
40 HMODULE _libGlHandle = NULL;
42 void *_libGlHandle = NULL;
51 #elif defined(__APPLE__)
58 * Lookup a public EGL/GL/GLES symbol
60 * The spec states that eglGetProcAddress should only be used for non-core
61 * (extensions) entry-points. Core entry-points should be taken directly from
62 * the API specific libraries.
64 * We cannot tell here which API a symbol is meant for here (as some are
65 * exported by many). So this code assumes that the appropriate shared
66 * libraries have been loaded previously (either dlopened with RTLD_GLOBAL, or
67 * as part of the executable dependencies), and that their symbols available
68 * for quering via dlsym(RTLD_NEXT, ...).
71 _getPublicProcAddress(const char *procName)
75 * Android does not support LD_PRELOAD. It is assumed that applications
76 * are explicitely loading egltrace.so.
79 if (procName[0] == 'e' && procName[1] == 'g' && procName[2] == 'l') {
80 static void *libEGL = NULL;
82 libEGL = _dlopen("libEGL.so", RTLD_LOCAL | RTLD_LAZY);
87 return dlsym(libEGL, procName);
90 if (procName[0] == 'g' && procName[1] == 'l') {
91 /* TODO: Use GLESv1/GLESv2 on a per-context basis. */
92 static void *sym = NULL;
94 static void *libGLESv2 = NULL;
96 libGLESv2 = _dlopen("libGLESv2.so", RTLD_LOCAL | RTLD_LAZY);
99 sym = dlsym(libGLESv2, procName);
105 static void *libGLESv1 = NULL;
107 libGLESv1 = _dlopen("libGLESv1_CM.so", RTLD_LOCAL | RTLD_LAZY);
110 sym = dlsym(libGLESv1, procName);
119 return dlsym(RTLD_NEXT, procName);
124 * Lookup a private EGL/GL/GLES symbol
126 * Private symbols should always be available through eglGetProcAddress, and
127 * they are guaranteed to work with any context bound (regardless of the API).
129 * However, per issue#57, eglGetProcAddress returns garbage on some
130 * implementations, and the spec states that implementations may choose to also
131 * export extension functions publicly, so we always attempt dlsym before
132 * eglGetProcAddress to mitigate that.
135 _getPrivateProcAddress(const char *procName)
138 proc = _getPublicProcAddress(procName);
140 ((procName[0] == 'e' && procName[1] == 'g' && procName[2] == 'l') ||
141 (procName[0] == 'g' && procName[1] == 'l'))) {
142 proc = (void *) _eglGetProcAddress(procName);