mirror of
https://github.com/Relintai/pandemonium_engine.git
synced 2024-12-23 12:26:59 +01:00
133 lines
3.0 KiB
C++
133 lines
3.0 KiB
C++
#ifndef _BT_POOL_ALLOCATOR_H
|
|
#define _BT_POOL_ALLOCATOR_H
|
|
/*
|
|
Copyright (c) 2003-2006 Gino van den Bergen / Erwin Coumans https://bulletphysics.org
|
|
|
|
This software is provided 'as-is', without any express or implied warranty.
|
|
In no event will the authors be held liable for any damages arising from the use of this software.
|
|
Permission is granted to anyone to use this software for any purpose,
|
|
including commercial applications, and to alter it and redistribute it freely,
|
|
subject to the following restrictions:
|
|
|
|
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.
|
|
2. Altered source versions must be plainly marked as such, and must not be misrepresented as being the original software.
|
|
3. This notice may not be removed or altered from any source distribution.
|
|
*/
|
|
|
|
|
|
|
|
|
|
#include "btScalar.h"
|
|
#include "btAlignedAllocator.h"
|
|
#include "btThreads.h"
|
|
|
|
///The btPoolAllocator class allows to efficiently allocate a large pool of objects, instead of dynamically allocating them separately.
|
|
class btPoolAllocator
|
|
{
|
|
int m_elemSize;
|
|
int m_maxElements;
|
|
int m_freeCount;
|
|
void* m_firstFree;
|
|
unsigned char* m_pool;
|
|
btSpinMutex m_mutex; // only used if BT_THREADSAFE
|
|
|
|
public:
|
|
btPoolAllocator(int elemSize, int maxElements)
|
|
: m_elemSize(elemSize),
|
|
m_maxElements(maxElements)
|
|
{
|
|
m_pool = (unsigned char*)btAlignedAlloc(static_cast<unsigned int>(m_elemSize * m_maxElements), 16);
|
|
|
|
unsigned char* p = m_pool;
|
|
m_firstFree = p;
|
|
m_freeCount = m_maxElements;
|
|
int count = m_maxElements;
|
|
while (--count)
|
|
{
|
|
*(void**)p = (p + m_elemSize);
|
|
p += m_elemSize;
|
|
}
|
|
*(void**)p = 0;
|
|
}
|
|
|
|
~btPoolAllocator()
|
|
{
|
|
btAlignedFree(m_pool);
|
|
}
|
|
|
|
int getFreeCount() const
|
|
{
|
|
return m_freeCount;
|
|
}
|
|
|
|
int getUsedCount() const
|
|
{
|
|
return m_maxElements - m_freeCount;
|
|
}
|
|
|
|
int getMaxCount() const
|
|
{
|
|
return m_maxElements;
|
|
}
|
|
|
|
void* allocate(int size)
|
|
{
|
|
// release mode fix
|
|
(void)size;
|
|
btMutexLock(&m_mutex);
|
|
btAssert(!size || size <= m_elemSize);
|
|
//btAssert(m_freeCount>0); // should return null if all full
|
|
void* result = m_firstFree;
|
|
if (NULL != m_firstFree)
|
|
{
|
|
m_firstFree = *(void**)m_firstFree;
|
|
--m_freeCount;
|
|
}
|
|
btMutexUnlock(&m_mutex);
|
|
return result;
|
|
}
|
|
|
|
bool validPtr(void* ptr)
|
|
{
|
|
if (ptr)
|
|
{
|
|
if (((unsigned char*)ptr >= m_pool && (unsigned char*)ptr < m_pool + m_maxElements * m_elemSize))
|
|
{
|
|
return true;
|
|
}
|
|
}
|
|
return false;
|
|
}
|
|
|
|
void freeMemory(void* ptr)
|
|
{
|
|
if (ptr)
|
|
{
|
|
btAssert((unsigned char*)ptr >= m_pool && (unsigned char*)ptr < m_pool + m_maxElements * m_elemSize);
|
|
|
|
btMutexLock(&m_mutex);
|
|
*(void**)ptr = m_firstFree;
|
|
m_firstFree = ptr;
|
|
++m_freeCount;
|
|
btMutexUnlock(&m_mutex);
|
|
}
|
|
}
|
|
|
|
int getElementSize() const
|
|
{
|
|
return m_elemSize;
|
|
}
|
|
|
|
unsigned char* getPoolAddress()
|
|
{
|
|
return m_pool;
|
|
}
|
|
|
|
const unsigned char* getPoolAddress() const
|
|
{
|
|
return m_pool;
|
|
}
|
|
};
|
|
|
|
#endif //_BT_POOL_ALLOCATOR_H
|