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source: code/branches/physics/src/bullet/BulletCollision/GIMPACT/btGenericPoolAllocator.h @ 2056

Last change on this file since 2056 was 1963, checked in by rgrieder, 16 years ago

Added Bullet physics engine.

  • Property svn:eol-style set to native
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Line 
1/*! \file btGenericPoolAllocator.h
2\author Francisco Len Nßjera. email projectileman@yahoo.com
3
4General purpose allocator class
5*/
6/*
7Bullet Continuous Collision Detection and Physics Library
8Copyright (c) 2003-2006 Erwin Coumans  http://continuousphysics.com/Bullet/
9
10This software is provided 'as-is', without any express or implied warranty.
11In no event will the authors be held liable for any damages arising from the use of this software.
12Permission is granted to anyone to use this software for any purpose,
13including commercial applications, and to alter it and redistribute it freely,
14subject to the following restrictions:
15
161. 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.
172. Altered source versions must be plainly marked as such, and must not be misrepresented as being the original software.
183. 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 <memory.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
34class btGenericMemoryPool
35{
36public:
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;
42protected:
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
49public:
50
51        void init_pool(size_t element_size, size_t element_count);
52
53        void end_pool();
54
55
56        btGenericMemoryPool(size_t element_size, size_t element_count)
57        {
58                init_pool(element_size, element_count);
59        }
60
61        ~btGenericMemoryPool()
62        {
63                end_pool();
64        }
65
66
67        inline size_t get_pool_capacity()
68        {
69                return m_element_size*m_max_element_count;
70        }
71
72        inline size_t gem_element_size()
73        {
74                return m_element_size;
75        }
76
77        inline size_t get_max_element_count()
78        {
79                return m_max_element_count;
80        }
81
82        inline size_t get_allocated_count()
83        {
84                return m_allocated_count;
85        }
86
87        inline size_t get_free_positions_count()
88        {
89                return m_free_nodes_count;
90        }
91
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/*!
111General purpose Allocator which can create Memory Pools dynamiacally as needed.
112*/
113class btGenericPoolAllocator
114{
115protected:
116        size_t m_pool_element_size;
117        size_t m_pool_element_count;
118public:
119        btGenericMemoryPool * m_pools[BT_DEFAULT_MAX_POOLS];
120        size_t m_pool_count;
121
122
123        inline size_t get_pool_capacity()
124        {
125                return m_pool_element_size*m_pool_element_count;
126        }
127
128
129protected:
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);
136public:
137
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/*! \defgroup POOL_MEMORY_FUNCTIONS
159standar managed Memory functions. Memory pools are used.
160*/
161//! @{
162void * btPoolAlloc(size_t size);
163void * btPoolRealloc(void *ptr, size_t oldsize, size_t newsize);
164void btPoolFree(void *ptr);
165//! @}
166
167
168#endif
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