63 lines
1.9 KiB
C++
63 lines
1.9 KiB
C++
/*
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* Copyright (c) 2006-2009 Erin Catto http://www.box2d.org
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*
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* This software is provided 'as-is', without any express or implied
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* warranty. In no event will the authors be held liable for any damages
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* arising from the use of this software.
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* Permission is granted to anyone to use this software for any purpose,
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* including commercial applications, and to alter it and redistribute it
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* freely, subject to the following restrictions:
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* 1. The origin of this software must not be misrepresented; you must not
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* claim that you wrote the original software. If you use this software
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* in a product, an acknowledgment in the product documentation would be
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* appreciated but is not required.
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* 2. Altered source versions must be plainly marked as such, and must not be
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* misrepresented as being the original software.
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* 3. This notice may not be removed or altered from any source distribution.
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*/
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#ifndef B2_BLOCK_ALLOCATOR_H
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#define B2_BLOCK_ALLOCATOR_H
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#include "Box2D/Common/b2Settings.h"
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const int32 b2_chunkSize = 16 * 1024;
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const int32 b2_maxBlockSize = 640;
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const int32 b2_blockSizes = 14;
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const int32 b2_chunkArrayIncrement = 128;
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struct b2Block;
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struct b2Chunk;
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/// This is a small object allocator used for allocating small
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/// objects that persist for more than one time step.
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/// See: http://www.codeproject.com/useritems/Small_Block_Allocator.asp
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class b2BlockAllocator
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{
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public:
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b2BlockAllocator();
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~b2BlockAllocator();
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/// Allocate memory. This will use b2Alloc if the size is larger than b2_maxBlockSize.
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void* Allocate(int32 size);
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/// Free memory. This will use b2Free if the size is larger than b2_maxBlockSize.
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void Free(void* p, int32 size);
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void Clear();
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private:
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b2Chunk* m_chunks;
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int32 m_chunkCount;
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int32 m_chunkSpace;
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b2Block* m_freeLists[b2_blockSizes];
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static int32 s_blockSizes[b2_blockSizes];
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static uint8 s_blockSizeLookup[b2_maxBlockSize + 1];
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static bool s_blockSizeLookupInitialized;
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};
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#endif
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