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#ifndef PXS_MATERIAL_MANAGER_H
#define PXS_MATERIAL_MANAGER_H

#include "PxsMaterialCore.h"
#include "PxsDeformableSurfaceMaterialCore.h"
#include "PxsDeformableVolumeMaterialCore.h"
#include "PxsPBDMaterialCore.h"
#include "foundation/PxAlignedMalloc.h"

namespace physx
{
	struct PxsMaterialInfo
	{
		PxU16 mMaterialIndex0;
		PxU16 mMaterialIndex1;
	};

	template<class MaterialCore>
	class PxsMaterialManagerT 
	{
	public:
		PxsMaterialManagerT()
		{
			const PxU32 matCount = 128;
			materials = reinterpret_cast<MaterialCore*>(physx::PxAlignedAllocator<16>().allocate(sizeof(MaterialCore)*matCount, PX_FL));
			maxMaterials = matCount;
			for(PxU32 i=0; i<matCount; ++i)
			{
				materials[i].mMaterialIndex = MATERIAL_INVALID_HANDLE;
			}
		}

		~PxsMaterialManagerT()
		{
			physx::PxAlignedAllocator<16>().deallocate(materials);
		}

		void setMaterial(MaterialCore* mat)
		{
			const PxU16 materialIndex = mat->mMaterialIndex;
			resize(PxU32(materialIndex) + 1);
			materials[materialIndex] = *mat;
		}

		void updateMaterial(MaterialCore* mat)
		{
			materials[mat->mMaterialIndex] =*mat;
		}

		void removeMaterial(MaterialCore* mat)
		{
			mat->mMaterialIndex = MATERIAL_INVALID_HANDLE;
		}

		PX_FORCE_INLINE MaterialCore* getMaterial(const PxU32 index)const
		{
			PX_ASSERT(index <  maxMaterials);
			return &materials[index];
		}

		PxU32 getMaxSize()const 
		{
			return maxMaterials;
		}

		void resize(PxU32 minValueForMax)
		{			
			if(maxMaterials>=minValueForMax)
				return;

			const PxU32 numMaterials = maxMaterials;
			
			maxMaterials = (minValueForMax+31)&~31;
			MaterialCore* mat = reinterpret_cast<MaterialCore*>(physx::PxAlignedAllocator<16>().allocate(sizeof(MaterialCore)*maxMaterials, PX_FL));
			for(PxU32 i=0; i<numMaterials; ++i)
				mat[i] = materials[i];

			for(PxU32 i = numMaterials; i < maxMaterials; ++i)
				mat[i].mMaterialIndex = MATERIAL_INVALID_HANDLE;

			physx::PxAlignedAllocator<16>().deallocate(materials);

			materials = mat;
		}

		MaterialCore* materials;//make sure materials's start address is 16 bytes align
		PxU32 maxMaterials;
		PxU32 mPad;
#if !PX_P64_FAMILY
		PxU32 mPad2;
#endif
	};

	//This class is used for forward declaration
	class PxsMaterialManager : public PxsMaterialManagerT<PxsMaterialCore>
	{
	};

	class PxsDeformableSurfaceMaterialManager : public PxsMaterialManagerT<PxsDeformableSurfaceMaterialCore>
	{
	};

	class PxsDeformableVolumeMaterialManager : public PxsMaterialManagerT<PxsDeformableVolumeMaterialCore>
	{
	};

	class PxsPBDMaterialManager : public PxsMaterialManagerT<PxsPBDMaterialCore>
	{
	};

	template<class MaterialCore>
	class PxsMaterialManagerIterator
	{
	
	public:
		PxsMaterialManagerIterator(PxsMaterialManagerT<MaterialCore>& manager) : mManager(manager), mIndex(0)
		{
		}

		bool getNextMaterial(MaterialCore*& materialCore)
		{
			const PxU32 maxSize = mManager.getMaxSize();
			PxU32 index = mIndex;
			while(index < maxSize && mManager.getMaterial(index)->mMaterialIndex == MATERIAL_INVALID_HANDLE)
				index++;
			materialCore = NULL;
			if(index < maxSize)
				materialCore = mManager.getMaterial(index++);
			mIndex = index;
			return materialCore!=NULL;
		}

	private:
		PxsMaterialManagerIterator& operator=(const PxsMaterialManagerIterator&);
		PxsMaterialManagerT<MaterialCore>&	mManager;
		PxU32								mIndex;
	};

}

#endif