mirror of https://github.com/axmolengine/axmol.git
131 lines
3.0 KiB
C++
131 lines
3.0 KiB
C++
/*
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Copyright (c) 2003-2006 Gino van den Bergen / Erwin Coumans http://continuousphysics.com/Bullet/
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This software is provided 'as-is', without any express or implied warranty.
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In no event will the authors be held liable for any damages 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 freely,
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subject to the following restrictions:
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1. The origin of this software must not be misrepresented; you must not claim that you wrote the original software. If you use this software in a product, an acknowledgment in the product documentation would be appreciated but is not required.
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2. Altered source versions must be plainly marked as such, and must not be 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 _BT_POOL_ALLOCATOR_H
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#define _BT_POOL_ALLOCATOR_H
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#include "btScalar.h"
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#include "btAlignedAllocator.h"
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#include "btThreads.h"
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///The btPoolAllocator class allows to efficiently allocate a large pool of objects, instead of dynamically allocating them separately.
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class btPoolAllocator
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{
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int m_elemSize;
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int m_maxElements;
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int m_freeCount;
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void* m_firstFree;
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unsigned char* m_pool;
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btSpinMutex m_mutex; // only used if BT_THREADSAFE
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public:
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btPoolAllocator(int elemSize, int maxElements)
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: m_elemSize(elemSize),
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m_maxElements(maxElements)
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{
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m_pool = (unsigned char*)btAlignedAlloc(static_cast<unsigned int>(m_elemSize * m_maxElements), 16);
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unsigned char* p = m_pool;
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m_firstFree = p;
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m_freeCount = m_maxElements;
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int count = m_maxElements;
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while (--count)
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{
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*(void**)p = (p + m_elemSize);
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p += m_elemSize;
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}
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*(void**)p = 0;
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}
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~btPoolAllocator()
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{
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btAlignedFree(m_pool);
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}
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int getFreeCount() const
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{
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return m_freeCount;
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}
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int getUsedCount() const
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{
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return m_maxElements - m_freeCount;
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}
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int getMaxCount() const
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{
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return m_maxElements;
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}
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void* allocate(int size)
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{
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// release mode fix
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(void)size;
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btMutexLock(&m_mutex);
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btAssert(!size || size <= m_elemSize);
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//btAssert(m_freeCount>0); // should return null if all full
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void* result = m_firstFree;
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if (NULL != m_firstFree)
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{
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m_firstFree = *(void**)m_firstFree;
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--m_freeCount;
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}
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btMutexUnlock(&m_mutex);
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return result;
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}
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bool validPtr(void* ptr)
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{
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if (ptr)
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{
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if (((unsigned char*)ptr >= m_pool && (unsigned char*)ptr < m_pool + m_maxElements * m_elemSize))
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{
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return true;
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}
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}
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return false;
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}
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void freeMemory(void* ptr)
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{
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if (ptr)
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{
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btAssert((unsigned char*)ptr >= m_pool && (unsigned char*)ptr < m_pool + m_maxElements * m_elemSize);
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btMutexLock(&m_mutex);
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*(void**)ptr = m_firstFree;
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m_firstFree = ptr;
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++m_freeCount;
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btMutexUnlock(&m_mutex);
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}
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}
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int getElementSize() const
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{
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return m_elemSize;
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}
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unsigned char* getPoolAddress()
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{
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return m_pool;
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}
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const unsigned char* getPoolAddress() const
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{
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return m_pool;
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}
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};
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#endif //_BT_POOL_ALLOCATOR_H
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