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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 <unistd.h> // for symlink
#include <dlfcn.h>
#endif
/*
* Handle to the true OpenGL library.
*/
#if defined(_WIN32)
HINSTANCE __libGlHandle = NULL;
#else
void *__libGlHandle = NULL;
#endif
#if defined(_WIN32)
void *
__getPublicProcAddress(const char *procName)
{
if (!__libGlHandle) {
char szDll[MAX_PATH] = {0};
if (!GetSystemDirectoryA(szDll, MAX_PATH)) {
return NULL;
}
strcat(szDll, "\\\\opengl32.dll");
__libGlHandle = LoadLibraryA(szDll);
if (!__libGlHandle) {
os::log("apitrace: error: couldn't load %s\n", szDll);
return NULL;
}
}
return (void *)GetProcAddress(__libGlHandle, procName);
}
void *
__getPrivateProcAddress(const char *procName) {
return (void *)__wglGetProcAddress(procName);
}
#elif defined(__APPLE__)
/*
* Path to the true OpenGL framework
*/
static const char *libgl_filename = "/System/Library/Frameworks/OpenGL.framework/OpenGL";
/*
* Lookup a libGL symbol
*/
void * __libgl_sym(const char *symbol)
{
void *result;
if (!__libGlHandle) {
/*
* Unfortunately we can't just dlopen the true dynamic library because
* DYLD_LIBRARY_PATH/DYLD_FRAMEWORK_PATH take precedence, even for
* absolute paths. So we create a temporary symlink, and dlopen that
* instead.
*/
char temp_filename[] = "/tmp/tmp.XXXXXX";
if (mktemp(temp_filename) != NULL) {
if (symlink(libgl_filename, temp_filename) == 0) {
__libGlHandle = dlopen(temp_filename, RTLD_LOCAL | RTLD_NOW | RTLD_FIRST);
remove(temp_filename);
}
}
if (!__libGlHandle) {
os::log("apitrace: error: couldn't load %s\n", libgl_filename);
os::abort();
return NULL;
}
}
result = dlsym(__libGlHandle, symbol);
#ifndef RETRACE
if (result == dlsym(RTLD_SELF, symbol)) {
os::log("apitrace: error: symbol lookup recursion\n");
os::abort();
return NULL;
}
#endif
return result;
}
void *
__getPublicProcAddress(const char *procName)
{
return __libgl_sym(procName);
}
void *
__getPrivateProcAddress(const char *procName)
{
return __libgl_sym(procName);
}
#else
/*
* Invoke the true dlopen() function.
*/
static void *
__dlopen(const char *filename, int flag)
{
typedef void * (*PFNDLOPEN)(const char *, int);
static PFNDLOPEN dlopen_ptr = NULL;
if (!dlopen_ptr) {
dlopen_ptr = (PFNDLOPEN)dlsym(RTLD_NEXT, "dlopen");
if (!dlopen_ptr) {
os::log("apitrace: error: dlsym(RTLD_NEXT, \"dlopen\") failed\n");
return NULL;
}
}
return dlopen_ptr(filename, flag);
}
/*
* Lookup a libGL symbol
*/
void * __libgl_sym(const char *symbol)
{
void *result;
if (!__libGlHandle) {
/*
* The app doesn't directly link against libGL.so, nor does it directly
* dlopen it. So we have to load it ourselves.
*/
const char * libgl_filename = getenv("TRACE_LIBGL");
if (!libgl_filename) {
/*
* Try to use whatever libGL.so the library is linked against.
*/
result = dlsym(RTLD_NEXT, symbol);
if (result) {
__libGlHandle = RTLD_NEXT;
return result;
}
libgl_filename = "libGL.so.1";
}
/*
* It would have been preferable to use RTLD_LOCAL to ensure that the
* application can never access libGL.so symbols directly, but this
* won't work, given libGL.so often loads a driver specific SO and
* exposes symbols to it.
*/
__libGlHandle = __dlopen(libgl_filename, RTLD_GLOBAL | RTLD_LAZY);
if (!__libGlHandle) {
os::log("apitrace: error: couldn't find libGL.so\n");
return NULL;
}
}
return dlsym(__libGlHandle, symbol);
}
void *
__getPublicProcAddress(const char *procName)
{
return __libgl_sym(procName);
}
void *
__getPrivateProcAddress(const char *procName)
{
return (void *)__glXGetProcAddressARB((const GLubyte *)procName);
}
#endif
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