/*
 * UltraStar Deluxe - Karaoke Game
 *
 * UltraStar Deluxe is the legal property of its developers, whose names
 * are too numerous to list here. Please refer to the COPYRIGHT
 * file distributed with this source distribution.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; see the file COPYING. If not, write to
 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 * Boston, MA 02110-1301, USA.
 *
 */

#include "gl_delayed_allocation.hpp"
#include "application.hpp"

namespace usdx
{
	log4cpp::Category& GlDelayedAllocation::log =
		log4cpp::Category::getInstance("usdx.menu.gl_delayed_allocation");

	GlDelayedAllocation::GlDelayedAllocation()
		: initialized(false), end_of_life(false)
	{
	}

	GlDelayedAllocation::~GlDelayedAllocation()
	{
		boost::shared_lock<boost::shared_mutex> lock(initialized_mutex);
		if (initialized) {
			log << log4cpp::Priority::ERROR << "You forgot to call dispose, "
				<< "before destroying an object with GlDelayedAllocation";
		}
	}

	void GlDelayedAllocation::do_dispose(void)
	{
		boost::upgrade_lock<boost::shared_mutex> initialized_lock(initialized_mutex);
		if (initialized) {
			{
				boost::unique_lock<boost::shared_mutex> end_of_life_lock(end_of_life_mutex);
				end_of_life = true;
			}

			if (Application::is_gl_thread()) {
				this->gl_cleanup();

				boost::upgrade_to_unique_lock<boost::shared_mutex> unique_lock(initialized_lock);
				initialized = false;
			}
			else {
				dispose_done.wait(initialized_lock);
			}
		}
	}

	void GlDelayedAllocation::enable(void)
	{
		boost::upgrade_lock<boost::shared_mutex> initialized_lock(initialized_mutex);
		if (!initialized) {
			this->gl_initialize();

			boost::upgrade_to_unique_lock<boost::shared_mutex> unique_lock(initialized_lock);
			initialized = true;
		}
	}

	void GlDelayedAllocation::disable(void)
	{
		boost::upgrade_lock<boost::shared_mutex> initialized_lock(initialized_mutex);
		boost::upgrade_lock<boost::shared_mutex> end_of_life_lock(end_of_life_mutex);
		if (initialized && end_of_life) {
			this->gl_cleanup();

			{
				boost::upgrade_to_unique_lock<boost::shared_mutex> unique_lock(initialized_lock);
				initialized = false;
			}

			dispose_done.notify_all();
		}
	}
}