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// Copyright (c) 2004-2008 AGEIA Technologies, Inc. All rights reserved.
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#include "PsVecMath.h"
#include "PsVecTransform.h"
#include "GuVecTriangle.h"
#include "GuGeometryUnion.h"

#include "GuContactMethodImpl.h"
#include "PxTriangleMesh.h"
#include "GuContactBuffer.h"
#include "GuHeightField.h"
#include "GuPCMContactConvexCommon.h"
#include "GuSegment.h"
#include "GuInternal.h"
#include "GuPCMContactMeshCallback.h"

using namespace physx;
using namespace Gu;
using namespace Ps::aos;

namespace physx
{

struct PCMCapsuleVsHeightfieldContactGenerationCallback :  PCMHeightfieldContactGenerationCallback<PCMCapsuleVsHeightfieldContactGenerationCallback>
{
	PCMCapsuleVsHeightfieldContactGenerationCallback& operator=(const PCMCapsuleVsHeightfieldContactGenerationCallback&);

public:
	PCMCapsuleVsMeshContactGeneration		mGeneration;

	PCMCapsuleVsHeightfieldContactGenerationCallback(
		const Gu::CapsuleV&								capsule,
		const Ps::aos::FloatVArg						contactDistance,
		const Ps::aos::FloatVArg						replaceBreakingThreshold,
	
		const PsTransformV&								capsuleTransform, 
		const PsTransformV&								heightfieldTransform,
		const PxTransform&								heightfieldTransform1,
		Gu::MultiplePersistentContactManifold&			multiManifold,
		Gu::ContactBuffer&								contactBuffer,
		Ps::InlineArray<PxU32, LOCAL_CONTACTS_SIZE>*	deferredContacts,
		Gu::HeightFieldUtil& hfUtil 
		
		
	) :
		PCMHeightfieldContactGenerationCallback<PCMCapsuleVsHeightfieldContactGenerationCallback>(hfUtil, heightfieldTransform1),
		mGeneration(capsule, contactDistance, replaceBreakingThreshold, capsuleTransform, heightfieldTransform, multiManifold, 
			contactBuffer, deferredContacts)
	{
	}

	template<PxU32 CacheSize>
	void processTriangleCache(Gu::TriangleCache<CacheSize>& cache)
	{
		mGeneration.processTriangleCache<CacheSize, PCMCapsuleVsMeshContactGeneration>(cache);
	}
	
};

bool Gu::pcmContactCapsuleHeightField(GU_CONTACT_METHOD_ARGS)
{
	PX_UNUSED(renderOutput);

	const PxCapsuleGeometry& shapeCapsule = shape0.get<const PxCapsuleGeometry>();
	const PxHeightFieldGeometryLL& shapeHeight = shape1.get<const PxHeightFieldGeometryLL>();

	Gu::MultiplePersistentContactManifold& multiManifold = cache.getMultipleManifold();

	const FloatV capsuleRadius = FLoad(shapeCapsule.radius);
	const FloatV contactDist = FLoad(params.mContactDistance);

	const PsTransformV capsuleTransform = loadTransformA(transform0);//capsule transform
	const PsTransformV heightfieldTransform = loadTransformA(transform1);//height feild

	const PsTransformV curTransform = heightfieldTransform.transformInv(capsuleTransform);
	
	const FloatV replaceBreakingThreshold = FMul(capsuleRadius, FLoad(0.001f));

	if(multiManifold.invalidate(curTransform, capsuleRadius, FLoad(0.02f)))
	{

		multiManifold.mNumManifolds = 0;
		multiManifold.setRelativeTransform(curTransform); 

		Gu::HeightFieldUtil hfUtil(shapeHeight);

		const PxVec3 tmp = getCapsuleHalfHeightVector(transform0, shapeCapsule);

		const PxReal inflatedRadius = shapeCapsule.radius + params.mContactDistance;

		const PxVec3 capsuleCenterInMesh = transform1.transformInv(transform0.p);
		const PxVec3 capsuleDirInMesh = transform1.rotateInv(tmp);
		const Gu::CapsuleV capsule(V3LoadU(capsuleCenterInMesh), V3LoadU(capsuleDirInMesh), capsuleRadius);

		PCMCapsuleVsHeightfieldContactGenerationCallback callback(
			capsule,
			contactDist,
			replaceBreakingThreshold,
			capsuleTransform,
			heightfieldTransform,
			transform1,
			multiManifold,
			contactBuffer,
			NULL,
			hfUtil
		);

		PxBounds3 bounds;
		bounds.maximum = PxVec3(shapeCapsule.halfHeight + inflatedRadius, inflatedRadius, inflatedRadius);
		bounds.minimum = -bounds.maximum;

		bounds = PxBounds3::transformFast(transform1.transformInv(transform0), bounds);

		hfUtil.overlapAABBTriangles(transform1, bounds, 0, &callback);

		callback.mGeneration.processContacts(GU_CAPSULE_MANIFOLD_CACHE_SIZE, false);
	}
	else
	{
		const PsMatTransformV aToB(curTransform);
		// We must be in local space to use the cache
		const FloatV projectBreakingThreshold = FMul(capsuleRadius, FLoad(0.05f));
		const FloatV refereshDistance = FAdd(capsuleRadius, contactDist);
		multiManifold.refreshManifold(aToB, projectBreakingThreshold, refereshDistance);

	}
	return multiManifold.addManifoldContactsToContactBuffer(contactBuffer, capsuleTransform, heightfieldTransform, capsuleRadius);
}


}