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// Copyright (c) 2008-2019 NVIDIA Corporation. All rights reserved.
// Copyright (c) 2004-2008 AGEIA Technologies, Inc. All rights reserved.
// Copyright (c) 2001-2004 NovodeX AG. All rights reserved.  

#ifndef GU_BV4_H
#define GU_BV4_H

#include "foundation/PxBounds3.h"
#include "common/PxSerialFramework.h"
#include "PsUserAllocated.h"
#include "GuBV4Settings.h"
#include "GuCenterExtents.h"

#define V4LoadU_Safe	V4LoadU
#define V4LoadA_Safe	V4LoadA
#define V4StoreA_Safe	V4StoreA
#define V4StoreU_Safe	V4StoreU

namespace physx
{
namespace Gu
{

	struct VertexPointers
	{
		const PxVec3*	Vertex[3];
	};

	class IndTri32 : public physx::shdfnd::UserAllocated
	{
		public:
		PX_FORCE_INLINE				IndTri32()								{}
		PX_FORCE_INLINE				IndTri32(PxU32 r0, PxU32 r1, PxU32 r2)	{ mRef[0]=r0; mRef[1]=r1; mRef[2]=r2; }
		PX_FORCE_INLINE				IndTri32(const IndTri32& triangle)
									{
										mRef[0] = triangle.mRef[0];
										mRef[1] = triangle.mRef[1];
										mRef[2] = triangle.mRef[2];
									}
		PX_FORCE_INLINE				~IndTri32()								{}
						PxU32		mRef[3];
	};
	PX_COMPILE_TIME_ASSERT(sizeof(IndTri32)==12);

	class IndTri16 : public physx::shdfnd::UserAllocated
	{
		public:
		PX_FORCE_INLINE				IndTri16()								{}
		PX_FORCE_INLINE				IndTri16(PxU16 r0, PxU16 r1, PxU16 r2)	{ mRef[0]=r0; mRef[1]=r1; mRef[2]=r2; }
		PX_FORCE_INLINE				IndTri16(const IndTri16& triangle)
									{
										mRef[0] = triangle.mRef[0];
										mRef[1] = triangle.mRef[1];
										mRef[2] = triangle.mRef[2];
									}
		PX_FORCE_INLINE				~IndTri16()								{}
						PxU16		mRef[3];
	};
	PX_COMPILE_TIME_ASSERT(sizeof(IndTri16)==6);

	PX_FORCE_INLINE void getVertexReferences(PxU32& vref0, PxU32& vref1, PxU32& vref2, PxU32 index, const IndTri32* T32, const IndTri16* T16)
	{
		if(T32)
		{
			const IndTri32* PX_RESTRICT tri = T32 + index;
			vref0 = tri->mRef[0];
			vref1 = tri->mRef[1];
			vref2 = tri->mRef[2];
		}
		else
		{
			const IndTri16* PX_RESTRICT tri = T16 + index;
			vref0 = tri->mRef[0];
			vref1 = tri->mRef[1];
			vref2 = tri->mRef[2];
		}
	}


	class SourceMeshBase : public physx::shdfnd::UserAllocated
	{
	public:
		PX_PHYSX_COMMON_API				SourceMeshBase();
		PX_PHYSX_COMMON_API				~SourceMeshBase();
	
		SourceMeshBase(const PxEMPTY) {}

		PxU32			mNbVerts;
		const PxVec3*	mVerts;

		PX_FORCE_INLINE	PxU32			getNbVertices()		const { return mNbVerts; }
		PX_FORCE_INLINE	const PxVec3*	getVerts()			const { return mVerts; }

		PX_FORCE_INLINE	void			setNbVertices(PxU32 nb) { mNbVerts = nb; }

		PX_FORCE_INLINE	void			initRemap() { mRemap = NULL; }
		PX_FORCE_INLINE	const PxU32*	getRemap()	const { return mRemap; }
		PX_FORCE_INLINE	void			releaseRemap() { PX_FREE_AND_RESET(mRemap); }

	protected:
		PxU32*			mRemap;

	};

	class SourceMesh : public SourceMeshBase
	{
		public:
		PX_PHYSX_COMMON_API				SourceMesh();
		PX_PHYSX_COMMON_API				~SourceMesh();
		// PX_SERIALIZATION
						SourceMesh(const PxEMPTY)	{}
		static			void			getBinaryMetaData(PxOutputStream& stream);
		//~PX_SERIALIZATION

						void			reset();
						void			operator = (SourceMesh& v);

						PxU32			mNbTris;
						IndTri32*		mTriangles32;
						IndTri16*		mTriangles16;

		PX_FORCE_INLINE	PxU32			getNbTriangles()	const	{ return mNbTris;		}
		//PX_FORCE_INLINE	PxU32			getNbVertices()		const	{ return mNbVerts;		}
		PX_FORCE_INLINE	const IndTri32*	getTris32()			const	{ return mTriangles32;	}
		PX_FORCE_INLINE	const IndTri16*	getTris16()			const	{ return mTriangles16;	}
		//PX_FORCE_INLINE	const PxVec3*	getVerts()			const	{ return mVerts;		}

		PX_FORCE_INLINE	void			setNbTriangles(PxU32 nb)	{ mNbTris = nb;			}
		//PX_FORCE_INLINE	void			setNbVertices(PxU32 nb)		{ mNbVerts = nb;		}

		PX_FORCE_INLINE	void			setPointers(IndTri32* tris32, IndTri16* tris16, const PxVec3* verts)
										{
											mTriangles32	= tris32;
											mTriangles16	= tris16;
											mVerts			= verts;
										}

		void							remapTopology(const PxU32* order);

						bool			isValid()		const;

		PX_FORCE_INLINE	void			getTriangle(VertexPointers& vp, PxU32 index)	const
										{
											PxU32 VRef0, VRef1, VRef2;
											getVertexReferences(VRef0, VRef1, VRef2, index, mTriangles32, mTriangles16);
											vp.Vertex[0] = mVerts + VRef0;
											vp.Vertex[1] = mVerts + VRef1;
											vp.Vertex[2] = mVerts + VRef2;
										}
	
	};

	struct LocalBounds
	{
		// PX_SERIALIZATION
										LocalBounds(const PxEMPTY)										{}
		//~PX_SERIALIZATION
										LocalBounds() : mCenter(PxVec3(0.0f)), mExtentsMagnitude(0.0f)	{}

						PxVec3			mCenter;
						float			mExtentsMagnitude;

		PX_FORCE_INLINE	void			init(const PxBounds3& bounds)
										{
											mCenter = bounds.getCenter();
											// PT: TODO: compute mag first, then multiplies by 0.5f (TA34704)
											mExtentsMagnitude = bounds.getExtents().magnitude();
										}
	};

	class QuantizedAABB
	{
		public:

		struct Data
		{
				PxU16		mExtents;	//!< Quantized extents
				PxI16		mCenter;	//!< Quantized center
		};
				Data		mData[3];
	};
	PX_COMPILE_TIME_ASSERT(sizeof(QuantizedAABB)==12);

	/////

	#define GU_BV4_CHILD_OFFSET_SHIFT_COUNT	11
	static	PX_FORCE_INLINE	PxU32	getChildOffset(PxU32 data)	{ return data>>GU_BV4_CHILD_OFFSET_SHIFT_COUNT;	}
	static	PX_FORCE_INLINE	PxU32	getChildType(PxU32 data)	{ return (data>>1)&3;							}

	template<class BoxType>
	struct BVDataPackedT : public physx::shdfnd::UserAllocated
	{
						BoxType			mAABB;
						PxU32			mData;

		PX_FORCE_INLINE	PxU32			isLeaf()			const	{ return mData&1;								}
		PX_FORCE_INLINE	PxU32			getPrimitive()		const	{ return mData>>1;								}
		PX_FORCE_INLINE	PxU32			getChildOffset()	const	{ return mData>>GU_BV4_CHILD_OFFSET_SHIFT_COUNT;}
		PX_FORCE_INLINE	PxU32			getChildType()		const	{ return (mData>>1)&3;							}
		PX_FORCE_INLINE	PxU32			getChildData()		const	{ return mData;									}

		PX_FORCE_INLINE	void			encodePNS(PxU32 code)
										{
											PX_ASSERT(code<256);
											mData |= code<<3;
										}
		PX_FORCE_INLINE	PxU32			decodePNSNoShift()	const	{ return mData;									}
	};

	typedef BVDataPackedT<QuantizedAABB>	BVDataPackedQ;
#ifdef GU_BV4_COMPILE_NON_QUANTIZED_TREE
	typedef BVDataPackedT<CenterExtents>	BVDataPackedNQ;
#endif

	// PT: TODO: align class to 16? (TA34704)
	class BV4Tree : public physx::shdfnd::UserAllocated
	{
		public:
		// PX_SERIALIZATION
										BV4Tree(const PxEMPTY);
						void			exportExtraData(PxSerializationContext&);
						void			importExtraData(PxDeserializationContext& context);
		static			void			getBinaryMetaData(PxOutputStream& stream);
		//~PX_SERIALIZATION

		PX_PHYSX_COMMON_API				BV4Tree();
		PX_PHYSX_COMMON_API				BV4Tree(SourceMesh* meshInterface, const PxBounds3& localBounds);
		PX_PHYSX_COMMON_API				~BV4Tree();

						bool			load(PxInputStream& stream, bool mismatch);

						void			reset();
						void			operator = (BV4Tree& v);

						bool			init(SourceMesh* meshInterface, const PxBounds3& localBounds);
						void			release();

						void			refit(float epsilon);

						// PT: TODO: use a single pointer to SourceMeshBase
						SourceMesh*					mMeshInterface;
						LocalBounds		mLocalBounds;

						PxU32			mNbNodes;
						void*			mNodes;				// PT: BVDataPacked / BVDataSwizzled
						PxU32			mInitData;
						// PT: the dequantization coeffs are only used for quantized trees
						PxVec3			mCenterOrMinCoeff;	// PT: dequantization coeff, either for Center or Min (depending on AABB format)
						PxVec3			mExtentsOrMaxCoeff;	// PT: dequantization coeff, either for Extents or Max (depending on AABB format)
						bool			mUserAllocated;		// PT: please keep these 4 bytes right after mCenterOrMinCoeff/mExtentsOrMaxCoeff for safe V4 loading
						bool			mQuantized;			// PT: true for quantized trees
						bool			mPadding[2];
	};

} // namespace Gu
}

#endif // GU_BV4_H