1 | /* |
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2 | ----------------------------------------------------------------------------- |
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3 | This source file is part of OGRE |
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4 | (Object-oriented Graphics Rendering Engine) |
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5 | For the latest info, see http://www.ogre3d.org/ |
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6 | |
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7 | Copyright (c) 2000-2006 Torus Knot Software Ltd |
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8 | Also see acknowledgements in Readme.html |
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9 | |
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10 | This program is free software; you can redistribute it and/or modify it under |
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11 | the terms of the GNU Lesser General Public License as published by the Free Software |
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12 | Foundation; either version 2 of the License, or (at your option) any later |
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13 | version. |
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14 | |
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15 | This program is distributed in the hope that it will be useful, but WITHOUT |
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16 | ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS |
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17 | FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details. |
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18 | |
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19 | You should have received a copy of the GNU Lesser General Public License along with |
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20 | this program; if not, write to the Free Software Foundation, Inc., 59 Temple |
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21 | Place - Suite 330, Boston, MA 02111-1307, USA, or go to |
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22 | http://www.gnu.org/copyleft/lesser.txt. |
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23 | |
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24 | You may alternatively use this source under the terms of a specific version of |
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25 | the OGRE Unrestricted License provided you have obtained such a license from |
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26 | Torus Knot Software Ltd. |
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27 | ----------------------------------------------------------------------------- |
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28 | */ |
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29 | #include "OgreGLHardwareBufferManager.h" |
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30 | #include "OgreGLHardwareVertexBuffer.h" |
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31 | #include "OgreGLHardwareIndexBuffer.h" |
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32 | #include "OgreHardwareBuffer.h" |
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33 | #include "OgreAlignedAllocator.h" |
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34 | |
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35 | namespace Ogre { |
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36 | //----------------------------------------------------------------------- |
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37 | // Scratch pool management (32 bit structure) |
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38 | struct GLScratchBufferAlloc |
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39 | { |
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40 | /// Size in bytes |
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41 | uint32 size: 31; |
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42 | /// Free? (pack with size) |
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43 | uint32 free: 1; |
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44 | }; |
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45 | #define SCRATCH_POOL_SIZE 1 * 1024 * 1024 |
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46 | //--------------------------------------------------------------------- |
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47 | GLHardwareBufferManager::GLHardwareBufferManager() |
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48 | { |
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49 | // Init scratch pool |
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50 | // TODO make it a configurable size? |
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51 | // 32-bit aligned buffer |
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52 | mScratchBufferPool = static_cast<char*>(AlignedMemory::allocate(SCRATCH_POOL_SIZE, 32)); |
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53 | GLScratchBufferAlloc* ptrAlloc = (GLScratchBufferAlloc*)mScratchBufferPool; |
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54 | ptrAlloc->size = SCRATCH_POOL_SIZE - sizeof(GLScratchBufferAlloc); |
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55 | ptrAlloc->free = 1; |
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56 | } |
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57 | //----------------------------------------------------------------------- |
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58 | GLHardwareBufferManager::~GLHardwareBufferManager() |
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59 | { |
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60 | destroyAllDeclarations(); |
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61 | destroyAllBindings(); |
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62 | |
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63 | AlignedMemory::deallocate(mScratchBufferPool); |
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64 | } |
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65 | //----------------------------------------------------------------------- |
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66 | HardwareVertexBufferSharedPtr GLHardwareBufferManager::createVertexBuffer( |
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67 | size_t vertexSize, size_t numVerts, HardwareBuffer::Usage usage, bool useShadowBuffer) |
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68 | { |
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69 | GLHardwareVertexBuffer* buf = |
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70 | new GLHardwareVertexBuffer(vertexSize, numVerts, usage, useShadowBuffer); |
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71 | { |
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72 | OGRE_LOCK_MUTEX(mVertexBuffersMutex) |
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73 | mVertexBuffers.insert(buf); |
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74 | } |
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75 | return HardwareVertexBufferSharedPtr(buf); |
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76 | } |
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77 | //----------------------------------------------------------------------- |
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78 | HardwareIndexBufferSharedPtr |
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79 | GLHardwareBufferManager::createIndexBuffer( |
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80 | HardwareIndexBuffer::IndexType itype, size_t numIndexes, |
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81 | HardwareBuffer::Usage usage, bool useShadowBuffer) |
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82 | { |
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83 | GLHardwareIndexBuffer* buf = |
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84 | new GLHardwareIndexBuffer(itype, numIndexes, usage, useShadowBuffer); |
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85 | { |
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86 | OGRE_LOCK_MUTEX(mIndexBuffersMutex) |
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87 | mIndexBuffers.insert(buf); |
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88 | } |
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89 | return HardwareIndexBufferSharedPtr(buf); |
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90 | } |
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91 | //--------------------------------------------------------------------- |
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92 | GLenum GLHardwareBufferManager::getGLUsage(unsigned int usage) |
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93 | { |
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94 | switch(usage) |
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95 | { |
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96 | case HardwareBuffer::HBU_STATIC: |
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97 | case HardwareBuffer::HBU_STATIC_WRITE_ONLY: |
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98 | return GL_STATIC_DRAW_ARB; |
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99 | case HardwareBuffer::HBU_DYNAMIC: |
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100 | case HardwareBuffer::HBU_DYNAMIC_WRITE_ONLY: |
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101 | return GL_DYNAMIC_DRAW_ARB; |
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102 | case HardwareBuffer::HBU_DYNAMIC_WRITE_ONLY_DISCARDABLE: |
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103 | return GL_STREAM_DRAW_ARB; |
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104 | default: |
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105 | return GL_DYNAMIC_DRAW_ARB; |
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106 | }; |
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107 | } |
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108 | //--------------------------------------------------------------------- |
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109 | GLenum GLHardwareBufferManager::getGLType(unsigned int type) |
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110 | { |
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111 | switch(type) |
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112 | { |
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113 | case VET_FLOAT1: |
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114 | case VET_FLOAT2: |
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115 | case VET_FLOAT3: |
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116 | case VET_FLOAT4: |
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117 | return GL_FLOAT; |
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118 | case VET_SHORT1: |
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119 | case VET_SHORT2: |
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120 | case VET_SHORT3: |
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121 | case VET_SHORT4: |
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122 | return GL_SHORT; |
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123 | case VET_COLOUR: |
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124 | case VET_COLOUR_ABGR: |
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125 | case VET_COLOUR_ARGB: |
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126 | case VET_UBYTE4: |
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127 | return GL_UNSIGNED_BYTE; |
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128 | default: |
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129 | return 0; |
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130 | }; |
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131 | } |
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132 | //--------------------------------------------------------------------- |
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133 | //--------------------------------------------------------------------- |
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134 | void* GLHardwareBufferManager::allocateScratch(uint32 size) |
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135 | { |
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136 | // simple forward link search based on alloc sizes |
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137 | // not that fast but the list should never get that long since not many |
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138 | // locks at once (hopefully) |
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139 | OGRE_LOCK_MUTEX(mScratchMutex) |
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140 | |
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141 | |
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142 | // Alignment - round up the size to 32 bits |
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143 | // control blocks are 32 bits too so this packs nicely |
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144 | if (size % 4 != 0) |
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145 | { |
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146 | size += 4 - (size % 4); |
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147 | } |
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148 | |
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149 | uint32 bufferPos = 0; |
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150 | while (bufferPos < SCRATCH_POOL_SIZE) |
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151 | { |
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152 | GLScratchBufferAlloc* pNext = (GLScratchBufferAlloc*)(mScratchBufferPool + bufferPos); |
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153 | // Big enough? |
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154 | if (pNext->free && pNext->size >= size) |
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155 | { |
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156 | // split? And enough space for control block |
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157 | if(pNext->size > size + sizeof(GLScratchBufferAlloc)) |
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158 | { |
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159 | uint32 offset = sizeof(GLScratchBufferAlloc) + size; |
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160 | |
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161 | GLScratchBufferAlloc* pSplitAlloc = (GLScratchBufferAlloc*) |
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162 | (mScratchBufferPool + bufferPos + offset); |
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163 | pSplitAlloc->free = 1; |
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164 | // split size is remainder minus new control block |
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165 | pSplitAlloc->size = pNext->size - size - sizeof(GLScratchBufferAlloc); |
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166 | |
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167 | // New size of current |
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168 | pNext->size = size; |
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169 | } |
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170 | // allocate and return |
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171 | pNext->free = 0; |
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172 | |
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173 | // return pointer just after this control block (++ will do that for us) |
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174 | return ++pNext; |
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175 | |
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176 | } |
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177 | |
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178 | bufferPos += sizeof(GLScratchBufferAlloc) + pNext->size; |
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179 | |
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180 | } |
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181 | |
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182 | // no available alloc |
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183 | return 0; |
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184 | |
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185 | } |
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186 | //--------------------------------------------------------------------- |
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187 | void GLHardwareBufferManager::deallocateScratch(void* ptr) |
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188 | { |
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189 | OGRE_LOCK_MUTEX(mScratchMutex) |
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190 | |
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191 | // Simple linear search dealloc |
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192 | uint32 bufferPos = 0; |
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193 | GLScratchBufferAlloc* pLast = 0; |
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194 | while (bufferPos < SCRATCH_POOL_SIZE) |
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195 | { |
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196 | GLScratchBufferAlloc* pCurrent = (GLScratchBufferAlloc*)(mScratchBufferPool + bufferPos); |
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197 | |
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198 | // Pointers match? |
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199 | if ((mScratchBufferPool + bufferPos + sizeof(GLScratchBufferAlloc)) |
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200 | == ptr) |
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201 | { |
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202 | // dealloc |
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203 | pCurrent->free = 1; |
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204 | |
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205 | // merge with previous |
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206 | if (pLast && pLast->free) |
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207 | { |
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208 | // adjust buffer pos |
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209 | bufferPos -= (pLast->size + sizeof(GLScratchBufferAlloc)); |
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210 | // merge free space |
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211 | pLast->size += pCurrent->size + sizeof(GLScratchBufferAlloc); |
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212 | pCurrent = pLast; |
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213 | } |
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214 | |
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215 | // merge with next |
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216 | uint32 offset = bufferPos + pCurrent->size + sizeof(GLScratchBufferAlloc); |
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217 | if (offset < SCRATCH_POOL_SIZE) |
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218 | { |
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219 | GLScratchBufferAlloc* pNext = (GLScratchBufferAlloc*)( |
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220 | mScratchBufferPool + offset); |
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221 | if (pNext->free) |
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222 | { |
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223 | pCurrent->size += pNext->size + sizeof(GLScratchBufferAlloc); |
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224 | } |
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225 | } |
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226 | |
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227 | // done |
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228 | return; |
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229 | } |
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230 | |
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231 | bufferPos += sizeof(GLScratchBufferAlloc) + pCurrent->size; |
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232 | pLast = pCurrent; |
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233 | |
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234 | } |
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235 | |
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236 | // Should never get here unless there's a corruption |
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237 | assert (false && "Memory deallocation error"); |
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238 | |
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239 | |
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240 | } |
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241 | } |
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