1 /*! \file btGenericPoolAllocator.h
2 \author Francisco Leon Najera. email projectileman@yahoo.com
3 
4 General purpose allocator class
5 */
6 /*
7 Bullet Continuous Collision Detection and Physics Library
8 Copyright (c) 2003-2006 Erwin Coumans  http://continuousphysics.com/Bullet/
9 
10 This software is provided 'as-is', without any express or implied warranty.
11 In no event will the authors be held liable for any damages arising from the use of this software.
12 Permission is granted to anyone to use this software for any purpose,
13 including commercial applications, and to alter it and redistribute it freely,
14 subject to the following restrictions:
15 
16 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.
17 2. Altered source versions must be plainly marked as such, and must not be misrepresented as being the original software.
18 3. This notice may not be removed or altered from any source distribution.
19 */
20 
21 #ifndef BT_GENERIC_POOL_ALLOCATOR_H
22 #define BT_GENERIC_POOL_ALLOCATOR_H
23 
24 #include <limits.h>
25 #include <stdio.h>
26 #include <string.h>
27 #include "LinearMath/btAlignedAllocator.h"
28 
29 #define BT_UINT_MAX UINT_MAX
30 #define BT_DEFAULT_MAX_POOLS 16
31 
32 
33 //! Generic Pool class
34 class btGenericMemoryPool
35 {
36 public:
37 	unsigned char * m_pool; //[m_element_size*m_max_element_count];
38 	size_t * m_free_nodes; //[m_max_element_count];//! free nodes
39 	size_t * m_allocated_sizes;//[m_max_element_count];//! Number of elements allocated per node
40 	size_t m_allocated_count;
41 	size_t m_free_nodes_count;
42 protected:
43 	size_t m_element_size;
44 	size_t m_max_element_count;
45 
46 	size_t allocate_from_free_nodes(size_t num_elements);
47 	size_t allocate_from_pool(size_t num_elements);
48 
49 public:
50 
51 	void init_pool(size_t element_size, size_t element_count);
52 
53 	void end_pool();
54 
55 
btGenericMemoryPool(size_t element_size,size_t element_count)56 	btGenericMemoryPool(size_t element_size, size_t element_count)
57 	{
58 		init_pool(element_size, element_count);
59 	}
60 
~btGenericMemoryPool()61 	~btGenericMemoryPool()
62 	{
63 		end_pool();
64 	}
65 
66 
get_pool_capacity()67 	inline size_t get_pool_capacity()
68 	{
69 		return m_element_size*m_max_element_count;
70 	}
71 
gem_element_size()72 	inline size_t gem_element_size()
73 	{
74 		return m_element_size;
75 	}
76 
get_max_element_count()77 	inline size_t get_max_element_count()
78 	{
79 		return m_max_element_count;
80 	}
81 
get_allocated_count()82 	inline size_t get_allocated_count()
83 	{
84 		return m_allocated_count;
85 	}
86 
get_free_positions_count()87 	inline size_t get_free_positions_count()
88 	{
89 		return m_free_nodes_count;
90 	}
91 
get_element_data(size_t element_index)92 	inline void * get_element_data(size_t element_index)
93 	{
94 		return &m_pool[element_index*m_element_size];
95 	}
96 
97 	//! Allocates memory in pool
98 	/*!
99 	\param size_bytes size in bytes of the buffer
100 	*/
101 	void * allocate(size_t size_bytes);
102 
103 	bool freeMemory(void * pointer);
104 };
105 
106 
107 
108 
109 //! Generic Allocator with pools
110 /*!
111 General purpose Allocator which can create Memory Pools dynamiacally as needed.
112 */
113 class btGenericPoolAllocator
114 {
115 protected:
116 	size_t m_pool_element_size;
117 	size_t m_pool_element_count;
118 public:
119 	btGenericMemoryPool * m_pools[BT_DEFAULT_MAX_POOLS];
120 	size_t m_pool_count;
121 
122 
get_pool_capacity()123 	inline size_t get_pool_capacity()
124 	{
125 		return m_pool_element_size*m_pool_element_count;
126 	}
127 
128 
129 protected:
130 	// creates a pool
131 	btGenericMemoryPool * push_new_pool();
132 
133 	void * failback_alloc(size_t size_bytes);
134 
135 	bool failback_free(void * pointer);
136 public:
137 
btGenericPoolAllocator(size_t pool_element_size,size_t pool_element_count)138 	btGenericPoolAllocator(size_t pool_element_size, size_t pool_element_count)
139 	{
140 		m_pool_count = 0;
141 		m_pool_element_size = pool_element_size;
142 		m_pool_element_count = pool_element_count;
143 	}
144 
145 	virtual ~btGenericPoolAllocator();
146 
147 	//! Allocates memory in pool
148 	/*!
149 	\param size_bytes size in bytes of the buffer
150 	*/
151 	void * allocate(size_t size_bytes);
152 
153 	bool freeMemory(void * pointer);
154 };
155 
156 
157 
158 void * btPoolAlloc(size_t size);
159 void * btPoolRealloc(void *ptr, size_t oldsize, size_t newsize);
160 void btPoolFree(void *ptr);
161 
162 
163 #endif
164