growingsmallbuffer.h

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/*
* Copyright 2016 Autodesk, Inc. All rights reserved.
* Use of this software is subject to the terms of the Autodesk license agreement and any attachments or Appendices thereto provided at the time of installation or download,
* or which otherwise accompanies this software in either electronic or hard copy form, or which is signed by you and accepted by Autodesk.
*/


#pragma once


#include "gwnavgeneration/common/generatormemory.h"
#include "gwnavgeneration/containers/tlsarray.h"


namespace Kaim
{


class GrowingSmallBufferPool
{
    KY_DEFINE_NEW_DELETE_OPERATORS(Stat_Default_Mem)
public:
    explicit GrowingSmallBufferPool(MemoryHeap* heap, KyUInt32 byteCountInChunk = 0);

    ~GrowingSmallBufferPool();

    KyUInt32 GetWordCount(KyInt32 byteCount);

    void* GetNewBuffer(KyUInt32 byteCount);

    void Clear();

    void Release();

    KyUInt32 ByteCountAllocated() const { return m_byteCountAllocated; }

private:
    KyUInt32 m_maxWordCountInChunk;

    KyArrayTLS_POD<KyUInt32*> m_chunks; // TODO use KyArray
    KyUInt32 m_chunkCount;
    KyUInt32 m_wordCountInLastChunk;

    KyArrayTLS_POD<KyUInt32*> m_oversizedBuffers; // TODO use KyArray

    KyUInt32 m_byteCountAllocated;

    MemoryHeap* m_heap;
};

KY_INLINE KyUInt32 GrowingSmallBufferPool::GetWordCount(KyInt32 byteCount)
{
    // warning: don't use (byteCount - 1) / sizeof(KyUInt32) + 1; because it performs the division in KyUInt32 !!
    return (byteCount - 1) / (KyInt32)sizeof(KyUInt32) + 1;
}

}