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#ifndef GU_VEC_TRIANGLE_H
#define GU_VEC_TRIANGLE_H

#include "GuVecConvex.h"
#include "GuConvexSupportTable.h"
#include "GuDistancePointTriangle.h"

namespace physx
{
namespace Gu
{

	
	class TriangleV : public ConvexV
	{
		public:
		/**
		\brief Constructor
		*/
		PX_FORCE_INLINE			TriangleV() : ConvexV(ConvexType::eTRIANGLE)
		{
			margin = 0.02f;
			minMargin = PX_MAX_REAL;
			sweepMargin = PX_MAX_REAL;
		}
		/**
		\brief Constructor

		\param[in] p0 Point 0
		\param[in] p1 Point 1
		\param[in] p2 Point 2
		*/

		PX_FORCE_INLINE	TriangleV(const aos::Vec3VArg p0, const aos::Vec3VArg p1, const aos::Vec3VArg p2): ConvexV(ConvexType::eTRIANGLE)									
		{
			using namespace aos;
			//const FloatV zero = FZero();
			const FloatV num = FLoad(0.333333f);
			center = V3Scale(V3Add(V3Add(p0, p1), p2), num);
			verts[0] = p0;
			verts[1] = p1;
			verts[2] = p2;
			margin = 0.f;
			minMargin = PX_MAX_REAL;
			sweepMargin = PX_MAX_REAL;
		}

		PX_FORCE_INLINE	TriangleV(const PxVec3* pts) : ConvexV(ConvexType::eTRIANGLE)
		{
			using namespace aos;
			const Vec3V p0 = V3LoadU(pts[0]);
			const Vec3V p1 = V3LoadU(pts[1]);
			const Vec3V p2 = V3LoadU(pts[2]);
			const FloatV num = FLoad(0.333333f);
			center = V3Scale(V3Add(V3Add(p0, p1), p2), num);
			verts[0] = p0;
			verts[1] = p1;
			verts[2] = p2;
			margin = 0.f;
			minMargin = PX_MAX_REAL;
			sweepMargin = PX_MAX_REAL;
		}

		/**
		\brief Copy constructor

		\param[in] triangle Tri to copy
		*/
		PX_FORCE_INLINE			TriangleV(const Gu::TriangleV& triangle) : ConvexV(ConvexType::eTRIANGLE)
		{
			using namespace aos;
			verts[0] = triangle.verts[0];
			verts[1] = triangle.verts[1];
			verts[2] = triangle.verts[2];

			center = triangle.center;
			margin = 0.f;
			minMargin = PX_MAX_REAL;
			sweepMargin = PX_MAX_REAL;
		}
		/**
		\brief Destructor
		*/
		PX_FORCE_INLINE			~TriangleV()
		{
		}

		PX_FORCE_INLINE void populateVerts(const PxU8* inds, PxU32 numInds, const PxVec3* originalVerts, aos::Vec3V* vertexs)const
		{
			using namespace aos;

			for(PxU32 i=0; i<numInds; ++i)
			{
				vertexs[i] = V3LoadU(originalVerts[inds[i]]);
			}
		}

		PX_FORCE_INLINE aos::FloatV getSweepMargin() const
		{
			return aos::FMax();
		}

		PX_FORCE_INLINE void setCenter(const aos::Vec3VArg _center)
		{
			using namespace aos;
			Vec3V offset = V3Sub(_center, center);
			center = _center;
			verts[0] = V3Add(verts[0], offset);
			verts[1] = V3Add(verts[1], offset);
			verts[2] = V3Add(verts[2], offset);
		}

		/**
		\brief Compute the normal of the Triangle.

		\return Triangle normal.
		*/
		PX_FORCE_INLINE	aos::Vec3V	normal() const  
		{
			using namespace aos;
			const Vec3V ab = V3Sub(verts[1], verts[0]);
			const Vec3V ac = V3Sub(verts[2], verts[0]);
			const Vec3V n = V3Cross(ab, ac);
			return V3Normalize(n);
		}  

		/**
		\brief Compute the unnormalized normal of the Triangle.

		\param[out] _normal Triangle normal (not normalized).
		*/
		PX_FORCE_INLINE	void	denormalizedNormal(aos::Vec3V& _normal) const
		{
			using namespace aos;
			const Vec3V ab = V3Sub(verts[1], verts[0]);
			const Vec3V ac = V3Sub(verts[2], verts[0]);
			_normal = V3Cross(ab, ac);
		}

		PX_FORCE_INLINE	aos::FloatV	area() const
		{
			using namespace aos;
			const FloatV half = FLoad(0.5f);
			const Vec3V ba = V3Sub(verts[0], verts[1]);
			const Vec3V ca = V3Sub(verts[0], verts[2]);
			const Vec3V v = V3Cross(ba, ca);
			return FMul(V3Length(v), half);
		}

		//dir is in local space, verts in the local space
		PX_FORCE_INLINE aos::Vec3V supportLocal(const aos::Vec3VArg dir) const
		{
			using namespace aos;
			const Vec3V v0 = verts[0];
			const Vec3V v1 = verts[1];
			const Vec3V v2 = verts[2];
			const FloatV d0 = V3Dot(v0, dir);
			const FloatV d1 = V3Dot(v1, dir);
			const FloatV d2 = V3Dot(v2, dir);

			const BoolV con0 = BAnd(FIsGrtr(d0, d1), FIsGrtr(d0, d2));
			const BoolV con1 = FIsGrtr(d1, d2);
			return V3Sel(con0, v0, V3Sel(con1, v1, v2));
		}

		PX_FORCE_INLINE void supportLocal(const aos::Vec3VArg dir, aos::FloatV& min, aos::FloatV& max) const
		{
			using namespace aos;
			const Vec3V v0 = verts[0];
			const Vec3V v1 = verts[1];
			const Vec3V v2 = verts[2];
			FloatV d0 = V3Dot(v0, dir);
			FloatV d1 = V3Dot(v1, dir);
			FloatV d2 = V3Dot(v2, dir);

			max = FMax(d0, FMax(d1, d2));
			min = FMin(d0, FMin(d1, d2));
		}

		//dir is in b space
		PX_FORCE_INLINE aos::Vec3V supportRelative(const aos::Vec3VArg dir, const aos::PxMatTransformV& aToB, const aos::PxMatTransformV& aTobT) const
		{
			using namespace aos;
			//verts are in local space
//			const Vec3V _dir = aToB.rotateInv(dir); //transform dir back to a space
			const Vec3V _dir = aTobT.rotate(dir); //transform dir back to a space
			const Vec3V maxPoint = supportLocal(_dir);
			return aToB.transform(maxPoint);//transform maxPoint to the b space
		}

		PX_FORCE_INLINE aos::Vec3V supportLocal(const aos::Vec3VArg dir, PxI32& index) const
		{
		
			using namespace aos;
			const VecI32V vZero = VecI32V_Zero();
			const VecI32V vOne = VecI32V_One();
			const VecI32V vTwo = VecI32V_Two();
			const Vec3V v0 = verts[0];
			const Vec3V v1 = verts[1];
			const Vec3V v2 = verts[2];
			const FloatV d0 = V3Dot(v0, dir);
			const FloatV d1 = V3Dot(v1, dir);
			const FloatV d2 = V3Dot(v2, dir);
			const BoolV con0 = BAnd(FIsGrtr(d0, d1), FIsGrtr(d0, d2));
			const BoolV con1 = FIsGrtr(d1, d2);
			const VecI32V vIndex = VecI32V_Sel(con0, vZero, VecI32V_Sel(con1, vOne, vTwo));
			PxI32_From_VecI32V(vIndex, &index);
			return V3Sel(con0, v0, V3Sel(con1, v1, v2));
		}

		PX_FORCE_INLINE aos::Vec3V supportRelative(	const aos::Vec3VArg dir, const aos::PxMatTransformV& aToB,
														const aos::PxMatTransformV& aTobT, PxI32& index)const
		{
			//don't put margin in the triangle
			using namespace aos;
			//transfer dir into the local space of triangle
//			const Vec3V _dir = aToB.rotateInv(dir);
			const Vec3V _dir = aTobT.rotate(dir);
			return aToB.transform(supportLocal(_dir, index));//transform the support poin to b space
		}
	
		PX_FORCE_INLINE aos::Vec3V supportPoint(const PxI32 index)const
		{
			return verts[index];
		}

			/**
		\brief Array of Vertices.
		*/
		aos::Vec3V		verts[3];
	};
}

}

#endif
