/*
Bullet Continuous Collision Detection and Physics Library
Copyright (c) 2003-2006 Erwin Coumans  http://continuousphysics.com/Bullet/

This software is provided 'as-is', without any express or implied warranty.
In no event will the authors be held liable for any damages arising from the use of this software.
Permission is granted to anyone to use this software for any purpose, 
including commercial applications, and to alter it and redistribute it freely, 
subject to the following restrictions:

1. The origin of this software must not be misrepresented; you must not claim that you wrote the original software. If you use this software in a product, an acknowledgment in the product documentation would be appreciated but is not required.
2. Altered source versions must be plainly marked as such, and must not be misrepresented as being the original software.
3. This notice may not be removed or altered from any source distribution.
*/



#include "ParallelPhysicsEnvironment.h"
#include "CcdPhysicsController.h"
#include "ParallelIslandDispatcher.h"
#include "CollisionDispatch/CollisionWorld.h"
#include "ConstraintSolver/TypedConstraint.h"
#include "CollisionDispatch/SimulationIslandManager.h"
#include "SimulationIsland.h"


ParallelPhysicsEnvironment::ParallelPhysicsEnvironment(ParallelIslandDispatcher* dispatcher, OverlappingPairCache* pairCache):
CcdPhysicsEnvironment(dispatcher,pairCache)
{
	
}

ParallelPhysicsEnvironment::~ParallelPhysicsEnvironment()
{

}



/// Perform an integration step of duration 'timeStep'.
bool	ParallelPhysicsEnvironment::proceedDeltaTimeOneStep(float timeStep)
{
	OverlappingPairCache*	scene = m_collisionWorld->GetPairCache();
	scene->RefreshOverlappingPairs();


#ifdef USE_QUICKPROF
	Profiler::beginBlock("IslandUnionFind");
#endif //USE_QUICKPROF

	GetSimulationIslandManager()->UpdateActivationState(GetCollisionWorld(),GetCollisionWorld()->GetDispatcher());

	{
		int i;
		int numConstraints = m_constraints.size();
		for (i=0;i< numConstraints ; i++ )
		{
			TypedConstraint* constraint = m_constraints[i];

			const RigidBody* colObj0 = &constraint->GetRigidBodyA();
			const RigidBody* colObj1 = &constraint->GetRigidBodyB();

			if (((colObj0) && ((colObj0)->mergesSimulationIslands())) &&
				((colObj1) && ((colObj1)->mergesSimulationIslands())))
			{
				if (colObj0->IsActive() || colObj1->IsActive())
				{

					GetSimulationIslandManager()->GetUnionFind().unite((colObj0)->m_islandTag1,
						(colObj1)->m_islandTag1);
				}
			}
		}
	}

	GetSimulationIslandManager()->StoreIslandActivationState(GetCollisionWorld());

#ifdef USE_QUICKPROF
	Profiler::endBlock("IslandUnionFind");
#endif //USE_QUICKPROF

	
	///calculate simulation islands
	
#ifdef USE_QUICKPROF
	Profiler::beginBlock("BuildIslands");
#endif //USE_QUICKPROF

	std::vector<SimulationIsland> simulationIslands;
	simulationIslands.resize(GetNumControllers());

	int k;
	for (k=0;k<GetNumControllers();k++)
	{
			CcdPhysicsController* ctrl = m_controllers[k];
			int tag = ctrl->GetRigidBody()->m_islandTag1;
			if (tag>=0)
			{
				simulationIslands[tag].m_controllers.push_back(ctrl);
			}
	}

	Dispatcher* dispatcher = GetCollisionWorld()->GetDispatcher();

	
	
	int i;
	for (int i=0;i<	scene->GetNumOverlappingPairs();i++)
	{
		BroadphasePair* pair = &scene->GetOverlappingPair(i);

		CollisionObject*	col0 = static_cast<CollisionObject*>(pair->m_pProxy0->m_clientObject);
		CollisionObject*	col1 = static_cast<CollisionObject*>(pair->m_pProxy1->m_clientObject);
		
		if (col0->m_islandTag1 > col1->m_islandTag1)
		{
			simulationIslands[col0->m_islandTag1].m_overlappingPairs.push_back(*pair);
		} else
		{
			simulationIslands[col1->m_islandTag1].m_overlappingPairs.push_back(*pair);
		}
	}

	//add all overlapping pairs for each island

	for (i=0;i<dispatcher->GetNumManifolds();i++)
	{
		 PersistentManifold* manifold = dispatcher->GetManifoldByIndexInternal(i);
		 
		 //filtering for response

		 CollisionObject* colObj0 = static_cast<CollisionObject*>(manifold->GetBody0());
		 CollisionObject* colObj1 = static_cast<CollisionObject*>(manifold->GetBody1());
		 {
			 int islandTag = colObj0->m_islandTag1;
			 if (colObj1->m_islandTag1 > islandTag)
				 islandTag = colObj1->m_islandTag1;

				if (dispatcher->NeedsResponse(*colObj0,*colObj1))
					simulationIslands[islandTag].m_manifolds.push_back(manifold);
			
		 }
	}
	


	
	//Each simulation island can be processed in parallel
	for (k=0;k<simulationIslands.size();k++)
	{
		if (simulationIslands[k].m_controllers.size())
		{
			simulationIslands[k].Simulate(dispatcher,GetBroadphase(),m_solver,timeStep);
		}
	}
	return true;

}