2 * Copyright (c) 2006-2007 Erin Catto http://www.gphysics.com
4 * This software is provided 'as-is', without any express or implied
5 * warranty. In no event will the authors be held liable for any damages
6 * arising from the use of this software.
7 * Permission is granted to anyone to use this software for any purpose,
8 * including commercial applications, and to alter it and redistribute it
9 * freely, subject to the following restrictions:
10 * 1. The origin of this software must not be misrepresented; you must not
11 * claim that you wrote the original software. If you use this software
12 * in a product, an acknowledgment in the product documentation would be
13 * appreciated but is not required.
14 * 2. Altered source versions must be plainly marked as such, and must not be
15 * misrepresented as being the original software.
16 * 3. This notice may not be removed or altered from any source distribution.
19 #ifndef B2_BLOCK_ALLOCATOR_H
20 #define B2_BLOCK_ALLOCATOR_H
22 #include "b2Settings.h"
24 const int32 b2_chunkSize = 4096;
25 const int32 b2_maxBlockSize = 640;
26 const int32 b2_blockSizes = 14;
27 const int32 b2_chunkArrayIncrement = 128;
32 // This is a small object allocator used for allocating small
33 // objects that persist for more than one time step.
34 // See: http://www.codeproject.com/useritems/Small_Block_Allocator.asp
35 class b2BlockAllocator
41 void* Allocate(int32 size);
42 void Free(void* p, int32 size);
52 b2Block* m_freeLists[b2_blockSizes];
54 static int32 s_blockSizes[b2_blockSizes];
55 static uint8 s_blockSizeLookup[b2_maxBlockSize + 1];
56 static bool s_blockSizeLookupInitialized;