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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)
#ifndef _GNU_SOURCE
#define _GNU_SOURCE // for dladdr
#endif
#include <dlfcn.h>
#endif
/*
* Handle to the true OpenGL library.
* XXX: Not really used yet.
*/
#if defined(_WIN32)
HINSTANCE __libGlHandle = NULL;
#else
void *__libGlHandle = NULL;
#endif
#if defined(_WIN32)
#error Unsupported
#elif defined(__APPLE__)
#error Unsupported
#else
/*
* 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.
*
* We cannot tell here which API a symbol is meant for here (as some are
* exported by many). So this code assumes that the appropriate shared
* libraries have been loaded previously (either dlopened with RTLD_GLOBAL, or
* as part of the executable dependencies), and that their symbols available
* for quering via dlsym(RTLD_NEXT, ...).
*/
void *
__getPublicProcAddress(const char *procName)
{
return dlsym(RTLD_NEXT, procName);
}
/*
* 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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