SnippetImmUtils.h

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// Copyright (c) 2008-2022 NVIDIA Corporation. All rights reserved.
 
#include "PxPhysXConfig.h"
#include "foundation/PxArray.h"
#include "foundation/PxUserAllocated.h"
#include "collision/PxCollisionDefs.h"
#include "solver/PxSolverDefs.h"
 
namespace physx
{
namespace SnippetImmUtils
{
 
    class BlockBasedAllocator
    {
        struct AllocationPage : PxUserAllocated
        {
            static const PxU32 PageSize = 32 * 1024;
            PxU8 mPage[PageSize];
 
            PxU32 currentIndex;
 
            AllocationPage() : currentIndex(0){}
 
            PxU8* allocate(const PxU32 size)
            {
                PxU32 alignedSize = (size + 15)&(~15);
                if ((currentIndex + alignedSize) < PageSize)
                {
                    PxU8* ret = &mPage[currentIndex];
                    currentIndex += alignedSize;
                    return ret;
                }
                return NULL;
            }
        };
 
        AllocationPage* currentPage;
 
        PxArray<AllocationPage*> mAllocatedBlocks;
        PxU32 mCurrentIndex;
 
    public:
        BlockBasedAllocator() : currentPage(NULL), mCurrentIndex(0)
        {
        }
 
        virtual PxU8* allocate(const PxU32 byteSize)
        {
            if (currentPage)
            {
                PxU8* data = currentPage->allocate(byteSize);
                if (data)
                    return data;
            }
 
            if (mCurrentIndex < mAllocatedBlocks.size())
            {
                currentPage = mAllocatedBlocks[mCurrentIndex++];
                currentPage->currentIndex = 0;
                return currentPage->allocate(byteSize);
            }
            currentPage = PX_NEW(AllocationPage);
            mAllocatedBlocks.pushBack(currentPage);
            mCurrentIndex = mAllocatedBlocks.size();
 
            return currentPage->allocate(byteSize);
        }
 
        void release()
        {
            for (PxU32 a = 0; a < mAllocatedBlocks.size(); ++a)
                PX_DELETE(mAllocatedBlocks[a]);
            mAllocatedBlocks.clear();
            currentPage = NULL;
            mCurrentIndex = 0;
        }
 
        void reset()
        {
            currentPage = NULL;
            mCurrentIndex = 0;
        }
 
        virtual ~BlockBasedAllocator()
        {
            release();
        }
    };
 
    class TestCacheAllocator : public PxCacheAllocator
    {
        BlockBasedAllocator mAllocator[2];
        PxU32 currIdx;
 
    public:
 
        TestCacheAllocator() : currIdx(0)
        {
        }
 
        virtual PxU8* allocateCacheData(const PxU32 byteSize)
        {
            return mAllocator[currIdx].allocate(byteSize);
        }
 
        void release() { currIdx = 1 - currIdx; mAllocator[currIdx].release(); }
 
        void reset() { currIdx = 1 - currIdx; mAllocator[currIdx].reset(); }
 
        virtual ~TestCacheAllocator(){}
    };
 
    class TestConstraintAllocator : public PxConstraintAllocator
    {
        BlockBasedAllocator mConstraintAllocator;
        BlockBasedAllocator mFrictionAllocator[2];
 
        PxU32 currIdx;
    public:
 
        TestConstraintAllocator() : currIdx(0)
        {
        }
        virtual PxU8* reserveConstraintData(const PxU32 byteSize){ return mConstraintAllocator.allocate(byteSize); }
        virtual PxU8* reserveFrictionData(const PxU32 byteSize){ return mFrictionAllocator[currIdx].allocate(byteSize); }
 
        void release() { currIdx = 1 - currIdx; mConstraintAllocator.release(); mFrictionAllocator[currIdx].release(); }
 
        virtual ~TestConstraintAllocator() {}
    };
 
}
}