NpMaterialManager.h

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// Copyright (c) 2004-2008 AGEIA Technologies, Inc. All rights reserved.
// Copyright (c) 2001-2004 NovodeX AG. All rights reserved.  
 
 
#ifndef NP_MATERIALMANAGER
#define NP_MATERIALMANAGER
 
#include "foundation/PxMemory.h"
#include "CmIDPool.h"
 
namespace physx
{
    template<class Material>
    class NpMaterialManager 
    {
    public:
        NpMaterialManager()
        {
            const PxU32 matCount = 128;
            mMaterials = reinterpret_cast<Material**>(PX_ALLOC(sizeof(Material*) * matCount,  "NpMaterialManager::initialise"));
            mMaxMaterials = matCount;
            PxMemZero(mMaterials, sizeof(Material*)*mMaxMaterials);
        }
 
        ~NpMaterialManager() {}
 
        void releaseMaterials()
        {
            for(PxU32 i=0; i<mMaxMaterials; ++i)
            {
                if(mMaterials[i])
                {
                    const PxU32 handle(mMaterials[i]->mMaterial.mMaterialIndex);
                    mHandleManager.freeID(handle);
                    mMaterials[i]->release();
                    mMaterials[i] = NULL;
                }
            }
            PX_FREE(mMaterials);
        }
 
        bool setMaterial(Material& mat)
        {
            const PxU32 poolID = mHandleManager.getNewID();
            if (poolID >= MATERIAL_INVALID_HANDLE)
                return false;
 
            const PxU16 materialIndex = PxTo16(poolID);
 
            if(materialIndex >= mMaxMaterials)
                resize();
 
            mMaterials[materialIndex] = &mat;
            mat.mMaterial.mMaterialIndex = materialIndex;
            return true;
        }
 
        void updateMaterial(Material& mat)
        {
            mMaterials[mat.mMaterial.mMaterialIndex] = &mat;
        }
 
        PX_FORCE_INLINE PxU32 getNumMaterials() const
        {
            return mHandleManager.getNumUsedID();
        }
 
        void removeMaterial(Material& mat)
        {
            const PxU16 handle = mat.mMaterial.mMaterialIndex;
            if(handle != MATERIAL_INVALID_HANDLE)
            {
                mMaterials[handle] = NULL;
                mHandleManager.freeID(PxU32(handle));
            }
        }
 
        PX_FORCE_INLINE Material* getMaterial(const PxU32 index)    const
        {
            PX_ASSERT(index <  mMaxMaterials);
            return mMaterials[index];
        }
 
        PX_FORCE_INLINE PxU32 getMaxSize()  const 
        {
            return mMaxMaterials;
        }
 
        PX_FORCE_INLINE Material** getMaterials() const
        {
            return mMaterials;
        }
 
    private:
        void resize()
        {
            const PxU32 numMaterials = mMaxMaterials;
            mMaxMaterials = PxMin(mMaxMaterials*2, PxU32(MATERIAL_INVALID_HANDLE));
 
            Material** mat = reinterpret_cast<Material**>(PX_ALLOC(sizeof(Material*)*mMaxMaterials,  "NpMaterialManager::resize"));
            PxMemZero(mat, sizeof(Material*)*mMaxMaterials);
            for(PxU32 i=0; i<numMaterials; ++i)
                mat[i] = mMaterials[i];
 
            PX_FREE(mMaterials);
 
            mMaterials = mat;
        }
 
        Cm::IDPool      mHandleManager;
        Material**      mMaterials;
        PxU32           mMaxMaterials;
    };
 
    template<class Material>
    class NpMaterialManagerIterator
    {
    public:
        NpMaterialManagerIterator(const NpMaterialManager<Material>& manager) : mManager(manager), mIndex(0)
        {
        }
 
        bool getNextMaterial(Material*& np)
        {
            const PxU32 maxSize = mManager.getMaxSize();
            PxU32 index = mIndex;
            while(index < maxSize && mManager.getMaterial(index)==NULL)
                index++;
            np = NULL;
            if(index < maxSize)
                np = mManager.getMaterial(index++);
            mIndex = index;
            return np!=NULL;
        }
 
    private:
        NpMaterialManagerIterator& operator=(const NpMaterialManagerIterator&);
        const NpMaterialManager<Material>&  mManager;
        PxU32                               mIndex;
    };
}
 
#endif