[3] | 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 "OgreException.h" |
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| 32 | #include "OgreLogManager.h" |
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| 33 | |
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| 34 | namespace Ogre { |
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| 35 | |
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| 36 | //--------------------------------------------------------------------- |
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| 37 | GLHardwareVertexBuffer::GLHardwareVertexBuffer(size_t vertexSize, |
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| 38 | size_t numVertices, HardwareBuffer::Usage usage, bool useShadowBuffer) |
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| 39 | : HardwareVertexBuffer(vertexSize, numVertices, usage, false, useShadowBuffer) |
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| 40 | { |
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| 41 | glGenBuffersARB( 1, &mBufferId ); |
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| 42 | |
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| 43 | if (!mBufferId) |
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| 44 | { |
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| 45 | OGRE_EXCEPT(Exception::ERR_INTERNAL_ERROR, |
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| 46 | "Cannot create GL vertex buffer", |
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| 47 | "GLHardwareVertexBuffer::GLHardwareVertexBuffer"); |
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| 48 | } |
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| 49 | |
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| 50 | glBindBufferARB(GL_ARRAY_BUFFER_ARB, mBufferId); |
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| 51 | |
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| 52 | // Initialise mapped buffer and set usage |
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| 53 | glBufferDataARB(GL_ARRAY_BUFFER_ARB, mSizeInBytes, NULL, |
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| 54 | GLHardwareBufferManager::getGLUsage(usage)); |
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| 55 | |
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| 56 | //std::cerr << "creating vertex buffer = " << mBufferId << std::endl; |
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| 57 | } |
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| 58 | //--------------------------------------------------------------------- |
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| 59 | GLHardwareVertexBuffer::~GLHardwareVertexBuffer() |
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| 60 | { |
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| 61 | glDeleteBuffersARB(1, &mBufferId); |
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| 62 | } |
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| 63 | //--------------------------------------------------------------------- |
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| 64 | void* GLHardwareVertexBuffer::lockImpl(size_t offset, |
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| 65 | size_t length, LockOptions options) |
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| 66 | { |
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| 67 | GLenum access = 0; |
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| 68 | |
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| 69 | if(mIsLocked) |
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| 70 | { |
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| 71 | OGRE_EXCEPT(Exception::ERR_INTERNAL_ERROR, |
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| 72 | "Invalid attempt to lock an index buffer that has already been locked", |
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| 73 | "GLHardwareIndexBuffer::lock"); |
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| 74 | } |
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| 75 | |
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| 76 | |
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| 77 | void* retPtr = 0; |
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| 78 | |
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| 79 | // Try to use scratch buffers for smaller buffers |
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| 80 | if(length < OGRE_GL_MAP_BUFFER_THRESHOLD) |
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| 81 | { |
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| 82 | // if this fails, we fall back on mapping |
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| 83 | retPtr = static_cast<GLHardwareBufferManager*>( |
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| 84 | HardwareBufferManager::getSingletonPtr())->allocateScratch((uint32)length); |
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| 85 | |
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| 86 | if (retPtr) |
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| 87 | { |
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| 88 | mLockedToScratch = true; |
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| 89 | mScratchOffset = offset; |
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| 90 | mScratchSize = length; |
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| 91 | mScratchPtr = retPtr; |
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| 92 | mScratchUploadOnUnlock = (options != HBL_READ_ONLY); |
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| 93 | |
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| 94 | if (options != HBL_DISCARD) |
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| 95 | { |
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| 96 | // have to read back the data before returning the pointer |
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| 97 | readData(offset, length, retPtr); |
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| 98 | } |
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| 99 | } |
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| 100 | } |
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| 101 | |
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| 102 | if (!retPtr) |
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| 103 | { |
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| 104 | // Use glMapBuffer |
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| 105 | glBindBufferARB( GL_ARRAY_BUFFER_ARB, mBufferId ); |
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| 106 | // Use glMapBuffer |
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| 107 | if(options == HBL_DISCARD) |
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| 108 | { |
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| 109 | // Discard the buffer |
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| 110 | glBufferDataARB(GL_ARRAY_BUFFER_ARB, mSizeInBytes, NULL, |
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| 111 | GLHardwareBufferManager::getGLUsage(mUsage)); |
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| 112 | |
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| 113 | } |
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| 114 | if (mUsage & HBU_WRITE_ONLY) |
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| 115 | access = GL_WRITE_ONLY_ARB; |
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| 116 | else if (options == HBL_READ_ONLY) |
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| 117 | access = GL_READ_ONLY_ARB; |
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| 118 | else |
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| 119 | access = GL_READ_WRITE_ARB; |
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| 120 | |
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| 121 | void* pBuffer = glMapBufferARB( GL_ARRAY_BUFFER_ARB, access); |
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| 122 | |
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| 123 | if(pBuffer == 0) |
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| 124 | { |
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| 125 | OGRE_EXCEPT(Exception::ERR_INTERNAL_ERROR, |
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| 126 | "Vertex Buffer: Out of memory", "GLHardwareVertexBuffer::lock"); |
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| 127 | } |
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| 128 | |
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| 129 | // return offsetted |
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| 130 | retPtr = static_cast<void*>( |
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| 131 | static_cast<unsigned char*>(pBuffer) + offset); |
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| 132 | |
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| 133 | mLockedToScratch = false; |
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| 134 | } |
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| 135 | mIsLocked = true; |
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| 136 | return retPtr; |
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| 137 | } |
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| 138 | //--------------------------------------------------------------------- |
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| 139 | void GLHardwareVertexBuffer::unlockImpl(void) |
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| 140 | { |
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| 141 | if (mLockedToScratch) |
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| 142 | { |
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| 143 | if (mScratchUploadOnUnlock) |
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| 144 | { |
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| 145 | // have to write the data back to vertex buffer |
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| 146 | writeData(mScratchOffset, mScratchSize, mScratchPtr, |
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| 147 | mScratchOffset == 0 && mScratchSize == getSizeInBytes()); |
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| 148 | } |
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| 149 | |
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| 150 | // deallocate from scratch buffer |
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| 151 | static_cast<GLHardwareBufferManager*>( |
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| 152 | HardwareBufferManager::getSingletonPtr())->deallocateScratch(mScratchPtr); |
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| 153 | |
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| 154 | mLockedToScratch = false; |
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| 155 | } |
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| 156 | else |
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| 157 | { |
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| 158 | |
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| 159 | glBindBufferARB(GL_ARRAY_BUFFER_ARB, mBufferId); |
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| 160 | |
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| 161 | if(!glUnmapBufferARB( GL_ARRAY_BUFFER_ARB )) |
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| 162 | { |
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| 163 | OGRE_EXCEPT(Exception::ERR_INTERNAL_ERROR, |
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| 164 | "Buffer data corrupted, please reload", |
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| 165 | "GLHardwareVertexBuffer::unlock"); |
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| 166 | } |
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| 167 | } |
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| 168 | |
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| 169 | mIsLocked = false; |
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| 170 | } |
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| 171 | //--------------------------------------------------------------------- |
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| 172 | void GLHardwareVertexBuffer::readData(size_t offset, size_t length, |
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| 173 | void* pDest) |
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| 174 | { |
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| 175 | if(mUseShadowBuffer) |
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| 176 | { |
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| 177 | // get data from the shadow buffer |
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| 178 | void* srcData = mpShadowBuffer->lock(offset, length, HBL_READ_ONLY); |
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| 179 | memcpy(pDest, srcData, length); |
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| 180 | mpShadowBuffer->unlock(); |
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| 181 | } |
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| 182 | else |
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| 183 | { |
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| 184 | // get data from the real buffer |
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| 185 | glBindBufferARB(GL_ARRAY_BUFFER_ARB, mBufferId); |
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| 186 | |
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| 187 | glGetBufferSubDataARB(GL_ARRAY_BUFFER_ARB, offset, length, pDest); |
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| 188 | } |
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| 189 | } |
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| 190 | //--------------------------------------------------------------------- |
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| 191 | void GLHardwareVertexBuffer::writeData(size_t offset, size_t length, |
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| 192 | const void* pSource, bool discardWholeBuffer) |
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| 193 | { |
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| 194 | glBindBufferARB(GL_ARRAY_BUFFER_ARB, mBufferId); |
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| 195 | |
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| 196 | // Update the shadow buffer |
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| 197 | if(mUseShadowBuffer) |
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| 198 | { |
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| 199 | void* destData = mpShadowBuffer->lock(offset, length, |
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| 200 | discardWholeBuffer ? HBL_DISCARD : HBL_NORMAL); |
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| 201 | memcpy(destData, pSource, length); |
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| 202 | mpShadowBuffer->unlock(); |
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| 203 | } |
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| 204 | |
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| 205 | if (offset == 0 && length == mSizeInBytes) |
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| 206 | { |
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| 207 | glBufferDataARB(GL_ARRAY_BUFFER_ARB, mSizeInBytes, pSource, |
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| 208 | GLHardwareBufferManager::getGLUsage(mUsage)); |
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| 209 | } |
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| 210 | else |
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| 211 | { |
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| 212 | if(discardWholeBuffer) |
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| 213 | { |
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| 214 | glBufferDataARB(GL_ARRAY_BUFFER_ARB, mSizeInBytes, NULL, |
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| 215 | GLHardwareBufferManager::getGLUsage(mUsage)); |
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| 216 | } |
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| 217 | |
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| 218 | // Now update the real buffer |
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| 219 | glBufferSubDataARB(GL_ARRAY_BUFFER_ARB, offset, length, pSource); |
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| 220 | } |
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| 221 | } |
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| 222 | //--------------------------------------------------------------------- |
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| 223 | void GLHardwareVertexBuffer::_updateFromShadow(void) |
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| 224 | { |
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| 225 | if (mUseShadowBuffer && mShadowUpdated && !mSuppressHardwareUpdate) |
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| 226 | { |
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| 227 | const void *srcData = mpShadowBuffer->lock( |
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| 228 | mLockStart, mLockSize, HBL_READ_ONLY); |
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| 229 | |
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| 230 | glBindBufferARB(GL_ARRAY_BUFFER_ARB, mBufferId); |
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| 231 | |
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| 232 | // Update whole buffer if possible, otherwise normal |
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| 233 | if (mLockStart == 0 && mLockSize == mSizeInBytes) |
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| 234 | { |
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| 235 | glBufferDataARB(GL_ARRAY_BUFFER_ARB, mSizeInBytes, srcData, |
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| 236 | GLHardwareBufferManager::getGLUsage(mUsage)); |
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| 237 | } |
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| 238 | else |
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| 239 | { |
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| 240 | glBufferSubDataARB(GL_ARRAY_BUFFER_ARB, mLockStart, mLockSize, srcData); |
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| 241 | } |
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| 242 | |
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| 243 | mpShadowBuffer->unlock(); |
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| 244 | mShadowUpdated = false; |
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| 245 | } |
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| 246 | } |
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| 247 | } |
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