1 /*! \file btGenericPoolAllocator.h 2 \author Francisco Leon Najera. email projectileman (at) 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 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 /*! 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; 121 122 123 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: 137 138 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
