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#ifndef GU_VEC_CONVEXHULL_NOSCALE_H
#define GU_VEC_CONVEXHULL_NOSCALE_H

#include "foundation/PxUnionCast.h"
#include "common/PxPhysXCommonConfig.h"
#include "GuVecConvexHull.h"

namespace physx
{
namespace Gu
{
	class ConvexHullNoScaleV : public ConvexHullV
	{
		public:
		/**
		\brief Constructor
		*/
		PX_SUPPORT_INLINE ConvexHullNoScaleV(): ConvexHullV()
		{
		}

		PX_FORCE_INLINE aos::Vec3V supportPoint(const PxI32 index)const
		{
			using namespace aos;
			return V3LoadU_SafeReadW(verts[index]);	// PT: safe because of the way vertex memory is allocated in ConvexHullData (and 'verts' is initialized with ConvexHullData::getHullVertices())
		}

		//This funcation is just to load the PxVec3 to Vec3V. However, for GuVecConvexHul.h, this is used to transform all the verts from vertex space to shape space
		PX_SUPPORT_INLINE void populateVerts(const PxU8* inds, PxU32 numInds, const PxVec3* originalVerts, aos::Vec3V* verts_)const
		{
			using namespace aos;

			for(PxU32 i=0; i<numInds; ++i)
				verts_[i] = V3LoadU_SafeReadW(originalVerts[inds[i]]);	// PT: safe because of the way vertex memory is allocated in ConvexHullData (and 'populateVerts' is always called with polyData.mVerts)
		}
		
		//This function is used in epa
		//dir is in the shape space
		PX_SUPPORT_INLINE aos::Vec3V supportLocal(const aos::Vec3VArg dir)const
		{
			using namespace aos;
			const PxU32 maxIndex = supportVertexIndex(dir);
			return V3LoadU_SafeReadW(verts[maxIndex]);	// PT: safe because of the way vertex memory is allocated in ConvexHullData (and 'verts' is initialized with ConvexHullData::getHullVertices())
		}

		//this is used in the sat test for the full contact gen
		PX_SUPPORT_INLINE void supportLocal(const aos::Vec3VArg dir, aos::FloatV& min, aos::FloatV& max)const
		{
			supportVertexMinMax(dir, min, max);
		}

		//This function is used in epa
		PX_SUPPORT_INLINE aos::Vec3V supportRelative(const aos::Vec3VArg dir, const aos::PxMatTransformV& aTob, const aos::PxMatTransformV& aTobT) const
		{
			using namespace aos;
		
			//transform dir into the shape space
			const Vec3V _dir = aTobT.rotate(dir);//relTra.rotateInv(dir);
			const Vec3V maxPoint = supportLocal(_dir);
			//translate maxPoint from shape space of a back to the b space
			return aTob.transform(maxPoint);//relTra.transform(maxPoint);
		}

		//dir in the shape space, this function is used in gjk
		PX_SUPPORT_INLINE aos::Vec3V supportLocal(const aos::Vec3VArg dir, PxI32& index)const
		{
			using namespace aos;
			//scale dir and put it in the vertex space, for non-uniform scale, we don't want the scale in the dir, therefore, we are using
			//the transpose of the inverse of shape2Vertex(which is vertex2shape). This will allow us igore the scale and keep the rotation
			//get the extreme point index
			const PxU32 maxIndex = supportVertexIndex(dir);
			index = PxI32(maxIndex);
			return V3LoadU_SafeReadW(verts[index]);	// PT: safe because of the way vertex memory is allocated in ConvexHullData (and 'verts' is initialized with ConvexHullData::getHullVertices())
		}

		//this function is used in gjk
		PX_SUPPORT_INLINE aos::Vec3V supportRelative(	const aos::Vec3VArg dir, const aos::PxMatTransformV& aTob,
														const aos::PxMatTransformV& aTobT, PxI32& index)const
		{
			using namespace aos;

			//transform dir from b space to the shape space of a space
			const Vec3V _dir = aTobT.rotate(dir);//relTra.rotateInv(dir);//M33MulV3(skewInvRot, dir);
			const Vec3V p = supportLocal(_dir, index);
			//transfrom from a to b space
			return aTob.transform(p);
		}

		PX_SUPPORT_INLINE void bruteForceSearchMinMax(const aos::Vec3VArg _dir, aos::FloatV& min, aos::FloatV& max)const 
		{
			using namespace aos;
			//brute force
			//get the support point from the orignal margin
			FloatV _max = V3Dot(V3LoadU_SafeReadW(verts[0]), _dir);	// PT: safe because of the way vertex memory is allocated in ConvexHullData (and 'verts' is initialized with ConvexHullData::getHullVertices())
			FloatV _min = _max;

			for(PxU32 i = 1; i < numVerts; ++i)
			{ 
				PxPrefetchLine(&verts[i], 128);
				const Vec3V vertex = V3LoadU_SafeReadW(verts[i]);	// PT: safe because of the way vertex memory is allocated in ConvexHullData (and 'verts' is initialized with ConvexHullData::getHullVertices())
				const FloatV dist = V3Dot(vertex, _dir);

				_max = FMax(dist, _max);
				_min = FMin(dist, _min);
			}

			min = _min;
			max = _max;
		}

		//This function support no scaling, dir is in the shape space(the same as vertex space)
		PX_SUPPORT_INLINE void supportVertexMinMax(const aos::Vec3VArg dir, aos::FloatV& min, aos::FloatV& max)const
		{
			using namespace aos;

			if(data)
			{
				const PxU32 maxIndex = hillClimbing(dir);
				const PxU32 minIndex = hillClimbing(V3Neg(dir));
				const Vec3V maxPoint = V3LoadU_SafeReadW(verts[maxIndex]);	// PT: safe because of the way vertex memory is allocated in ConvexHullData (and 'verts' is initialized with ConvexHullData::getHullVertices())
				const Vec3V minPoint = V3LoadU_SafeReadW(verts[minIndex]);	// PT: safe because of the way vertex memory is allocated in ConvexHullData (and 'verts' is initialized with ConvexHullData::getHullVertices())
				min = V3Dot(dir, minPoint);
				max = V3Dot(dir, maxPoint);
			}
			else
			{
				bruteForceSearchMinMax(dir, min, max);
			}
		}  
	};

	#define PX_CONVEX_TO_NOSCALECONVEX(x)	(static_cast<const ConvexHullNoScaleV*>(x))
}

}

#endif	// 
