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/*
* Guest-side implementation of GL/GLX API. Replacement of standard libGL.so
*
* Copyright (c) 2006,2007 Even Rouault
*
* 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 <pthread.h>
#include "common.h"
#include "log.h"
#ifdef ENABLE_THREAD_SAFETY
extern GLState* new_gl_state();
extern pthread_mutex_t global_mutex;
extern pthread_key_t key_current_gl_state;
extern pthread_t last_current_thread;
extern GLState* _mono_threaded_current_gl_state;
extern GLState* default_gl_state;
/* Posix threading */
/* The concepts used here are coming directly from http://www.mesa3d.org/dispatch.html */
#ifdef TEST_IF_LOCK_USE_IS_CORRECT_INTO_MONO_THREADED_CASE
static int lock_count = 0;
#define LOCK(func_number) int __lock__ = 0; assert(lock_count == 0); lock_count++; pthread_mutex_lock( &global_mutex );
#define UNLOCK(func_number) assert(lock_count + __lock__ == 1); lock_count--; pthread_mutex_unlock( &global_mutex );
#define IS_MT() 2
static int _is_mt = 2;
#else
static int _is_mt = 0;
static inline int is_mt()
{
if (_is_mt) return 1;
pthread_t current_thread = pthread_self();
if (last_current_thread == 0)
last_current_thread = current_thread;
if (current_thread != last_current_thread)
{
_is_mt = 1;
log_gl("-------- Two threads at least are doing OpenGL ---------\n");
pthread_key_create(&key_current_gl_state, NULL);
}
return _is_mt;
}
#define IS_MT() is_mt()
/* The idea here is that the first GL/GLX call made in each thread is necessary a GLX call */
/* So in the case where it's a GLX call we always take the lock and check if we're in MT case */
/* otherwise (regular GL call), we have to take the lock only in the MT case */
#define LOCK(func_number) do { if (IS_GLX_CALL(func_number)) { pthread_mutex_lock( &global_mutex ); IS_MT(); } else if (_is_mt) { pthread_mutex_lock( &global_mutex ); } } while(0)
#define UNLOCK(func_number) do { if (IS_GLX_CALL(func_number) || _is_mt) pthread_mutex_unlock( &global_mutex ); } while(0)
#endif
static void set_current_state(GLState* current_gl_state)
{
if (_is_mt)
pthread_setspecific(key_current_gl_state, current_gl_state);
else
_mono_threaded_current_gl_state = current_gl_state;
}
static inline GLState* get_current_state()
{
GLState* current_gl_state;
if (_is_mt == 1 &&
last_current_thread == pthread_self())
{
_is_mt = 2;
set_current_state(_mono_threaded_current_gl_state);
_mono_threaded_current_gl_state = NULL;
}
current_gl_state = (_is_mt) ? pthread_getspecific(key_current_gl_state) : _mono_threaded_current_gl_state;
if (current_gl_state == NULL)
{
if (default_gl_state == NULL)
{
default_gl_state = new_gl_state();
}
current_gl_state = default_gl_state;
set_current_state(current_gl_state);
}
return current_gl_state;
}
#define SET_CURRENT_STATE(_x) set_current_state(_x)
/* No support for threading */
#else
#define LOCK(func_number)
#define UNLOCK(func_number)
#define GET_CURRENT_THREAD() 0
#define IS_MT() 0
static GLState* current_gl_state = NULL;
static inline GLState* get_current_state()
{
if (current_gl_state == NULL)
{
if (default_gl_state == NULL)
{
default_gl_state = new_gl_state();
}
return default_gl_state;
}
return current_gl_state;
}
#define SET_CURRENT_STATE(_x) current_gl_state = _x
#endif
#define GET_CURRENT_STATE() GLState* state = get_current_state()
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