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lib/haxebullet/bullet/BulletCollision/Gimpact/btGenericPoolAllocator.h

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+/*! \file btGenericPoolAllocator.h
+\author Francisco Leon Najera. email projectileman@yahoo.com
+
+General purpose allocator class
+*/
+/*
+Bullet Continuous Collision Detection and Physics Library
+Copyright (c) 2003-2006 Erwin Coumans  http://continuousphysics.com/Bullet/
+
+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.
+*/
+
+#ifndef BT_GENERIC_POOL_ALLOCATOR_H
+#define BT_GENERIC_POOL_ALLOCATOR_H
+
+#include <limits.h>
+#include <stdio.h>
+#include <string.h>
+#include "LinearMath/btAlignedAllocator.h"
+
+#define BT_UINT_MAX UINT_MAX
+#define BT_DEFAULT_MAX_POOLS 16
+
+
+//! Generic Pool class
+class btGenericMemoryPool
+{
+public:
+	unsigned char * m_pool; //[m_element_size*m_max_element_count];
+	size_t * m_free_nodes; //[m_max_element_count];//! free nodes
+	size_t * m_allocated_sizes;//[m_max_element_count];//! Number of elements allocated per node
+	size_t m_allocated_count;
+	size_t m_free_nodes_count;
+protected:
+	size_t m_element_size;
+	size_t m_max_element_count;
+
+	size_t allocate_from_free_nodes(size_t num_elements);
+	size_t allocate_from_pool(size_t num_elements);
+
+public:
+
+	void init_pool(size_t element_size, size_t element_count);
+
+	void end_pool();
+
+
+	btGenericMemoryPool(size_t element_size, size_t element_count)
+	{
+		init_pool(element_size, element_count);
+	}
+
+	~btGenericMemoryPool()
+	{
+		end_pool();
+	}
+
+
+	inline size_t get_pool_capacity()
+	{
+		return m_element_size*m_max_element_count;
+	}
+
+	inline size_t gem_element_size()
+	{
+		return m_element_size;
+	}
+
+	inline size_t get_max_element_count()
+	{
+		return m_max_element_count;
+	}
+
+	inline size_t get_allocated_count()
+	{
+		return m_allocated_count;
+	}
+
+	inline size_t get_free_positions_count()
+	{
+		return m_free_nodes_count;
+	}
+
+	inline void * get_element_data(size_t element_index)
+	{
+		return &m_pool[element_index*m_element_size];
+	}
+
+	//! Allocates memory in pool
+	/*!
+	\param size_bytes size in bytes of the buffer
+	*/
+	void * allocate(size_t size_bytes);
+
+	bool freeMemory(void * pointer);
+};
+
+
+
+
+//! Generic Allocator with pools
+/*!
+General purpose Allocator which can create Memory Pools dynamiacally as needed.
+*/
+class btGenericPoolAllocator
+{
+protected:
+	size_t m_pool_element_size;
+	size_t m_pool_element_count;
+public:
+	btGenericMemoryPool * m_pools[BT_DEFAULT_MAX_POOLS];
+	size_t m_pool_count;
+
+
+	inline size_t get_pool_capacity()
+	{
+		return m_pool_element_size*m_pool_element_count;
+	}
+
+
+protected:
+	// creates a pool
+	btGenericMemoryPool * push_new_pool();
+
+	void * failback_alloc(size_t size_bytes);
+
+	bool failback_free(void * pointer);
+public:
+
+	btGenericPoolAllocator(size_t pool_element_size, size_t pool_element_count)
+	{
+		m_pool_count = 0;
+		m_pool_element_size = pool_element_size;
+		m_pool_element_count = pool_element_count;
+	}
+
+	virtual ~btGenericPoolAllocator();
+
+	//! Allocates memory in pool
+	/*!
+	\param size_bytes size in bytes of the buffer
+	*/
+	void * allocate(size_t size_bytes);
+
+	bool freeMemory(void * pointer);
+};
+
+
+
+void * btPoolAlloc(size_t size);
+void * btPoolRealloc(void *ptr, size_t oldsize, size_t newsize);
+void btPoolFree(void *ptr);
+
+
+#endif