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#include "geometry/PxTriangleMesh.h"
#include "geomutils/PxContactBuffer.h"
#include "GuVecBox.h"
#include "GuVecConvexHull.h"
#include "GuVecConvexHullNoScale.h"
#include "GuVecTriangle.h"
#include "GuContactMethodImpl.h"
#include "GuPCMShapeConvex.h"
#include "GuHeightField.h"
#include "GuHeightFieldUtil.h"
#include "GuPCMContactConvexCommon.h"
#include "GuPCMContactMeshCallback.h"
#include "foundation/PxVecMath.h"

using namespace physx;
using namespace Gu;
using namespace aos;

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

	PCMConvexVsMeshContactGeneration	mGeneration;

	PCMConvexVsHeightfieldContactGenerationCallback(
		const FloatVArg contactDistance,
		const FloatVArg replaceBreakingThreshold,
		const PolygonalData& polyData,
		const SupportLocal* polyMap,
		const Cm::FastVertex2ShapeScaling& convexScaling,
		bool idtConvexScale,
		const PxTransformV& convexTransform, 
		const PxTransformV& heightfieldTransform,
		const PxTransform& heightfieldTransform1,
		MultiplePersistentContactManifold& multiManifold,
		PxContactBuffer& contactBuffer,
		HeightFieldUtil& hfUtil,
		PxInlineArray<PxU32, LOCAL_PCM_CONTACTS_SIZE>* delayedContacts,
		bool silhouetteEdgesAreActive,
		PxRenderOutput* renderOutput = NULL
	) :
		PCMHeightfieldContactGenerationCallback< PCMConvexVsHeightfieldContactGenerationCallback >(hfUtil, heightfieldTransform1),
		mGeneration(contactDistance, replaceBreakingThreshold, convexTransform, heightfieldTransform, multiManifold,
			contactBuffer, polyData, polyMap, delayedContacts, convexScaling, idtConvexScale, silhouetteEdgesAreActive, renderOutput)
	{
	}

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

bool Gu::PCMContactConvexHeightfield(
	const PolygonalData& polyData, const SupportLocal* polyMap, const FloatVArg minMargin,
	const PxBounds3& hullAABB, const PxHeightFieldGeometry& shapeHeightfield,
	const PxTransform& transform0, const PxTransform& transform1,
	PxReal contactDistance, PxContactBuffer& contactBuffer,
	const Cm::FastVertex2ShapeScaling& convexScaling, bool idtConvexScale,
	MultiplePersistentContactManifold& multiManifold, PxRenderOutput* renderOutput)
{
	const QuatV q0 = QuatVLoadA(&transform0.q.x);
	const Vec3V p0 = V3LoadA(&transform0.p.x);

	const QuatV q1 = QuatVLoadA(&transform1.q.x);
	const Vec3V p1 = V3LoadA(&transform1.p.x);

	const FloatV contactDist = FLoad(contactDistance);
	//Transfer A into the local space of B
	const PxTransformV convexTransform(p0, q0);//box
	const PxTransformV heightfieldTransform(p1, q1);//heightfield  
	const PxTransformV curTransform = heightfieldTransform.transformInv(convexTransform);
	
	if(multiManifold.invalidate(curTransform, minMargin))
	{
		const FloatV replaceBreakingThreshold = FMul(minMargin, FLoad(0.05f));
		multiManifold.mNumManifolds = 0;
		multiManifold.setRelativeTransform(curTransform); 

		////////////////////

		HeightFieldUtil hfUtil(shapeHeightfield);
		const HeightField& hf = hfUtil.getHeightField();

		////////////////////

		/*const Cm::Matrix34 world0(transform0);
		const Cm::Matrix34 world1(transform1);

		const PxU8* PX_RESTRICT extraData = meshData->mExtraTrigData;*/

	    PxInlineArray<PxU32, LOCAL_PCM_CONTACTS_SIZE> delayedContacts;
			
		PCMConvexVsHeightfieldContactGenerationCallback blockCallback(
			contactDist,
			replaceBreakingThreshold,
			polyData,
			polyMap, 
			convexScaling, 
			idtConvexScale,
			convexTransform, 
			heightfieldTransform,
			transform1,
			multiManifold,
			contactBuffer,
			hfUtil,
			&delayedContacts,
			!(hf.getFlags() & PxHeightFieldFlag::eNO_BOUNDARY_EDGES),
			renderOutput
		);

		hfUtil.overlapAABBTriangles(transform0, transform1, hullAABB, blockCallback);

		PX_ASSERT(multiManifold.mNumManifolds <= GU_MAX_MANIFOLD_SIZE);
		blockCallback.mGeneration.generateLastContacts();
		blockCallback.mGeneration.processContacts(GU_SINGLE_MANIFOLD_CACHE_SIZE, false);
	}
	else
	{
		const PxMatTransformV aToB(curTransform);

		const FloatV projectBreakingThreshold = FMul(minMargin, FLoad(0.6f));
		multiManifold.refreshManifold(aToB, projectBreakingThreshold, contactDist);
	}

#if PCM_LOW_LEVEL_DEBUG
	 multiManifold.drawManifold(*renderOutput, convexTransform, heightfieldTransform);
#endif
	return multiManifold.addManifoldContactsToContactBuffer(contactBuffer, heightfieldTransform);
}

bool Gu::pcmContactConvexHeightField(GU_CONTACT_METHOD_ARGS)
{
	const PxConvexMeshGeometry& shapeConvex = checkedCast<PxConvexMeshGeometry>(shape0);
	const PxHeightFieldGeometry& shapeHeightField = checkedCast<PxHeightFieldGeometry>(shape1);

	const ConvexHullData* hullData = _getHullData(shapeConvex);
	MultiplePersistentContactManifold& multiManifold = cache.getMultipleManifold();

	const QuatV q0 = QuatVLoadA(&transform0.q.x);
	const Vec3V p0 = V3LoadA(&transform0.p.x);

	const PxTransformV convexTransform(p0, q0);

	//const bool idtScaleMesh = shapeMesh.scale.isIdentity();

	//Cm::FastVertex2ShapeScaling meshScaling;
	//if(!idtScaleMesh)
	//	meshScaling.init(shapeMesh.scale);

	Cm::FastVertex2ShapeScaling convexScaling;
	PxBounds3 hullAABB;
	PolygonalData polyData;
	const bool idtScaleConvex = getPCMConvexData(shapeConvex, convexScaling, hullAABB, polyData);

	const Vec3V vScale = V3LoadU_SafeReadW(shapeConvex.scale.scale);	// PT: safe because 'rotation' follows 'scale' in PxMeshScale
	
	const PxReal toleranceLength = params.mToleranceLength;
	const FloatV minMargin = CalculatePCMConvexMargin(hullData, vScale, toleranceLength, GU_PCM_MESH_MANIFOLD_EPSILON);

	const QuatV vQuat = QuatVLoadU(&shapeConvex.scale.rotation.x);
	const ConvexHullV convexHull(hullData, V3Zero(), vScale, vQuat, shapeConvex.scale.isIdentity());

	if(idtScaleConvex)
	{
		SupportLocalImpl<ConvexHullNoScaleV> convexMap(static_cast<const ConvexHullNoScaleV&>(convexHull), convexTransform, convexHull.vertex2Shape, convexHull.shape2Vertex, idtScaleConvex);
		return PCMContactConvexHeightfield(polyData, &convexMap, minMargin, hullAABB, shapeHeightField, transform0, transform1, params.mContactDistance, contactBuffer, convexScaling, 
			idtScaleConvex, multiManifold, renderOutput);
	}
	else
	{
		SupportLocalImpl<ConvexHullV> convexMap(convexHull, convexTransform, convexHull.vertex2Shape, convexHull.shape2Vertex, idtScaleConvex);
		return PCMContactConvexHeightfield(polyData, &convexMap, minMargin, hullAABB, shapeHeightField, transform0, transform1, params.mContactDistance, contactBuffer, convexScaling, 
			idtScaleConvex, multiManifold, renderOutput);
	}
}  

bool Gu::pcmContactBoxHeightField(GU_CONTACT_METHOD_ARGS)
{
	MultiplePersistentContactManifold& multiManifold = cache.getMultipleManifold();

	const PxBoxGeometry& shapeBox = checkedCast<PxBoxGeometry>(shape0);
	const PxHeightFieldGeometry& shapeHeightField = checkedCast<PxHeightFieldGeometry>(shape1);

	const PxVec3 ext = shapeBox.halfExtents + PxVec3(params.mContactDistance);
	const PxBounds3 hullAABB(-ext, ext);

	const Cm::FastVertex2ShapeScaling idtScaling;

	const QuatV q0 = QuatVLoadA(&transform0.q.x);
	const Vec3V p0 = V3LoadA(&transform0.p.x);

	const Vec3V boxExtents = V3LoadU(shapeBox.halfExtents);

	const PxReal toranceLength = params.mToleranceLength;
	const FloatV minMargin = CalculatePCMBoxMargin(boxExtents, toranceLength, GU_PCM_MESH_MANIFOLD_EPSILON);

	const BoxV boxV(V3Zero(), boxExtents);

	const PxTransformV boxTransform(p0, q0);//box

	PolygonalData polyData;
	PCMPolygonalBox polyBox(shapeBox.halfExtents);
	polyBox.getPolygonalData(&polyData);

	const Mat33V identity = M33Identity();
	//SupportLocalImpl<BoxV> boxMap(boxV, boxTransform, identity, identity);
	SupportLocalImpl<BoxV> boxMap(boxV, boxTransform, identity, identity, true);

	return PCMContactConvexHeightfield(polyData, &boxMap, minMargin, hullAABB, shapeHeightField, transform0, transform1, params.mContactDistance, contactBuffer, 
		idtScaling, true, multiManifold, renderOutput);
}
