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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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