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/*
   core/physics.cc
   This file is part of the Osirion project and is distributed under
   the terms and conditions of the GNU General Public License version 2
*/

#include "model/collisionmesh.h"
#include "core/physics.h"
#include "core/zone.h"

#include "BulletCollision/Gimpact/btGImpactCollisionAlgorithm.h"

namespace core {

btDefaultCollisionConfiguration *Physics::physics_configuration = 0;
btCollisionDispatcher *Physics::physics_dispatcher = 0;
btSequentialImpulseConstraintSolver *Physics::physics_solver = 0;

void Physics::init()
{
	con_print << "^BInitializing physics engine..." << std::endl;
	
	model::CollisionModel::init();

	physics_configuration = new btDefaultCollisionConfiguration();
	physics_dispatcher = new btCollisionDispatcher(physics_configuration);
	btGImpactCollisionAlgorithm::registerAlgorithm(physics_dispatcher);
	physics_solver = new btSequentialImpulseConstraintSolver;
}

void Physics::done()
{
	con_print << "^BShutting down physics engine..." << std::endl;
	
	model::CollisionModel::shutdown();
	
	delete physics_solver;
	delete physics_dispatcher;
	delete physics_configuration;
	
	physics_configuration = 0;
	physics_dispatcher = 0;
	physics_solver = 0;
}

void Physics::frame(const unsigned long elapsed)
{
	const float seconds = (float) elapsed / 1000.0f;
	
	for (core::Zone::Registry::iterator it = core::Zone::registry().begin(); it != core::Zone::registry().end(); it++) {
		(*it).second->physics()->stepSimulation(seconds, 8);
	}
}

} // namespace core