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/**************************************************************************
*
* Copyright 2011 Jose Fonseca
* All Rights Reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*
**************************************************************************/
#include "glproc.hpp"
#if !defined(_WIN32)
#include "dlopen.hpp"
#endif
/*
* Handle to the true OpenGL library.
* XXX: Not really used yet.
*/
#if defined(_WIN32)
HMODULE _libGlHandle = NULL;
#else
void *_libGlHandle = NULL;
#endif
#if defined(_WIN32)
#error Unsupported
#elif defined(__APPLE__)
#error Unsupported
#else
#ifndef RTLD_DEEPBIND
#define RTLD_DEEPBIND 0
#endif
/*
* Lookup a public EGL/GL/GLES symbol
*
* The spec states that eglGetProcAddress should only be used for non-core
* (extensions) entry-points. Core entry-points should be taken directly from
* the API specific libraries.
*
*/
void *
_getPublicProcAddress(const char *procName)
{
void *proc;
/*
* We rely on dlsym(RTLD_NEXT, ...) whenever we can, because certain gl*
* symbols are exported by multiple APIs/SOs, and it's not trivial to
* determine which API/SO we should get the current symbol from.
*/
proc = dlsym(RTLD_NEXT, procName);
if (proc) {
return proc;
}
/*
* dlsym(RTLD_NEXT, ...) will fail when the SO containing the symbol was
* loaded with RTLD_LOCAL. We try to override RTLD_LOCAL with RTLD_GLOBAL
* when tracing but this doesn't always work. So we try to guess and load
* the shared object directly.
*
* See https://github.com/apitrace/apitrace/issues/349#issuecomment-113316990
*/
if (procName[0] == 'e' && procName[1] == 'g' && procName[2] == 'l') {
static void *libEGL = NULL;
if (!libEGL) {
libEGL = _dlopen("libEGL.so", RTLD_LOCAL | RTLD_LAZY | RTLD_DEEPBIND);
if (!libEGL) {
return NULL;
}
}
return dlsym(libEGL, procName);
}
/*
* This might happen when:
*
* - the application is querying non-extensions functions via
* eglGetProcAddress (either because EGL_KHR_get_all_proc_addresses
* is advertised, or merely because the EGL implementation supports
* it regardless, like Mesa does)
*
* - libGLES*.so nor libGL*.so was ever loaded.
*
* - we need to resolve entrypoints that application never asked (e.g.,
* glGetIntegerv), for internal purposes
*
* Therefore, we try to fallback to eglGetProcAddress.
*
* See https://github.com/apitrace/apitrace/issues/301#issuecomment-68532248
*/
if (strcmp(procName, "eglGetProcAddress") != 0) {
proc = (void *) _eglGetProcAddress(procName);
if (proc) {
return proc;
}
}
/*
* TODO: We could futher mitigate against using the wrong SO by:
* - using RTLD_NOLOAD to ensure we only use an existing SO
* - the determine the right SO via eglQueryAPI and glGetString(GL_VERSION)
*/
if (procName[0] == 'g' && procName[1] == 'l') {
/* TODO: Use GLESv1/GLESv2 on a per-context basis. */
static void *libGLESv2 = NULL;
if (!libGLESv2) {
libGLESv2 = _dlopen("libGLESv2.so", RTLD_LOCAL | RTLD_LAZY | RTLD_DEEPBIND);
}
if (libGLESv2) {
proc = dlsym(libGLESv2, procName);
}
if (proc) {
return proc;
}
static void *libGLESv1 = NULL;
if (!libGLESv1) {
libGLESv1 = _dlopen("libGLESv1_CM.so", RTLD_LOCAL | RTLD_LAZY | RTLD_DEEPBIND);
}
if (libGLESv1) {
proc = dlsym(libGLESv1, procName);
}
if (proc) {
return proc;
}
}
return NULL;
}
/*
* Lookup a private EGL/GL/GLES symbol
*
* Private symbols should always be available through eglGetProcAddress, and
* they are guaranteed to work with any context bound (regardless of the API).
*
* However, per issue#57, eglGetProcAddress returns garbage on some
* implementations, and the spec states that implementations may choose to also
* export extension functions publicly, so we always attempt dlsym before
* eglGetProcAddress to mitigate that.
*/
void *
_getPrivateProcAddress(const char *procName)
{
void *proc;
proc = _getPublicProcAddress(procName);
if (!proc &&
((procName[0] == 'e' && procName[1] == 'g' && procName[2] == 'l') ||
(procName[0] == 'g' && procName[1] == 'l'))) {
proc = (void *) _eglGetProcAddress(procName);
}
return proc;
}
#endif
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