1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/gfx/angle/src/libGLESv2/renderer/IndexBuffer.cpp Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,197 @@
1.4 +#include "precompiled.h"
1.5 +//
1.6 +// Copyright (c) 2002-2012 The ANGLE Project Authors. All rights reserved.
1.7 +// Use of this source code is governed by a BSD-style license that can be
1.8 +// found in the LICENSE file.
1.9 +//
1.10 +
1.11 +// IndexBuffer.cpp: Defines the abstract IndexBuffer class and IndexBufferInterface
1.12 +// class with derivations, classes that perform graphics API agnostic index buffer operations.
1.13 +
1.14 +#include "libGLESv2/renderer/IndexBuffer.h"
1.15 +#include "libGLESv2/renderer/Renderer.h"
1.16 +
1.17 +namespace rx
1.18 +{
1.19 +
1.20 +unsigned int IndexBuffer::mNextSerial = 1;
1.21 +
1.22 +IndexBuffer::IndexBuffer()
1.23 +{
1.24 + updateSerial();
1.25 +}
1.26 +
1.27 +IndexBuffer::~IndexBuffer()
1.28 +{
1.29 +}
1.30 +
1.31 +unsigned int IndexBuffer::getSerial() const
1.32 +{
1.33 + return mSerial;
1.34 +}
1.35 +
1.36 +void IndexBuffer::updateSerial()
1.37 +{
1.38 + mSerial = mNextSerial++;
1.39 +}
1.40 +
1.41 +
1.42 +IndexBufferInterface::IndexBufferInterface(Renderer *renderer, bool dynamic) : mRenderer(renderer)
1.43 +{
1.44 + mIndexBuffer = renderer->createIndexBuffer();
1.45 +
1.46 + mDynamic = dynamic;
1.47 + mWritePosition = 0;
1.48 +}
1.49 +
1.50 +IndexBufferInterface::~IndexBufferInterface()
1.51 +{
1.52 + if (mIndexBuffer)
1.53 + {
1.54 + delete mIndexBuffer;
1.55 + }
1.56 +}
1.57 +
1.58 +GLenum IndexBufferInterface::getIndexType() const
1.59 +{
1.60 + return mIndexBuffer->getIndexType();
1.61 +}
1.62 +
1.63 +unsigned int IndexBufferInterface::getBufferSize() const
1.64 +{
1.65 + return mIndexBuffer->getBufferSize();
1.66 +}
1.67 +
1.68 +unsigned int IndexBufferInterface::getSerial() const
1.69 +{
1.70 + return mIndexBuffer->getSerial();
1.71 +}
1.72 +
1.73 +bool IndexBufferInterface::mapBuffer(unsigned int size, void** outMappedMemory, unsigned int *streamOffset)
1.74 +{
1.75 + // Protect against integer overflow
1.76 + if (mWritePosition + size < mWritePosition)
1.77 + {
1.78 + return false;
1.79 + }
1.80 +
1.81 + if (!mIndexBuffer->mapBuffer(mWritePosition, size, outMappedMemory))
1.82 + {
1.83 + if (outMappedMemory)
1.84 + {
1.85 + *outMappedMemory = NULL;
1.86 + }
1.87 + return false;
1.88 + }
1.89 +
1.90 + if (streamOffset)
1.91 + {
1.92 + *streamOffset = mWritePosition;
1.93 + }
1.94 +
1.95 + mWritePosition += size;
1.96 + return true;
1.97 +}
1.98 +
1.99 +bool IndexBufferInterface::unmapBuffer()
1.100 +{
1.101 + return mIndexBuffer->unmapBuffer();
1.102 +}
1.103 +
1.104 +IndexBuffer * IndexBufferInterface::getIndexBuffer() const
1.105 +{
1.106 + return mIndexBuffer;
1.107 +}
1.108 +
1.109 +unsigned int IndexBufferInterface::getWritePosition() const
1.110 +{
1.111 + return mWritePosition;
1.112 +}
1.113 +
1.114 +void IndexBufferInterface::setWritePosition(unsigned int writePosition)
1.115 +{
1.116 + mWritePosition = writePosition;
1.117 +}
1.118 +
1.119 +bool IndexBufferInterface::discard()
1.120 +{
1.121 + return mIndexBuffer->discard();
1.122 +}
1.123 +
1.124 +bool IndexBufferInterface::setBufferSize(unsigned int bufferSize, GLenum indexType)
1.125 +{
1.126 + if (mIndexBuffer->getBufferSize() == 0)
1.127 + {
1.128 + return mIndexBuffer->initialize(bufferSize, indexType, mDynamic);
1.129 + }
1.130 + else
1.131 + {
1.132 + return mIndexBuffer->setSize(bufferSize, indexType);
1.133 + }
1.134 +}
1.135 +
1.136 +StreamingIndexBufferInterface::StreamingIndexBufferInterface(Renderer *renderer) : IndexBufferInterface(renderer, true)
1.137 +{
1.138 +}
1.139 +
1.140 +StreamingIndexBufferInterface::~StreamingIndexBufferInterface()
1.141 +{
1.142 +}
1.143 +
1.144 +bool StreamingIndexBufferInterface::reserveBufferSpace(unsigned int size, GLenum indexType)
1.145 +{
1.146 + bool result = true;
1.147 + unsigned int curBufferSize = getBufferSize();
1.148 + unsigned int writePos = getWritePosition();
1.149 + if (size > curBufferSize)
1.150 + {
1.151 + result = setBufferSize(std::max(size, 2 * curBufferSize), indexType);
1.152 + setWritePosition(0);
1.153 + }
1.154 + else if (writePos + size > curBufferSize || writePos + size < writePos)
1.155 + {
1.156 + if (!discard())
1.157 + {
1.158 + return false;
1.159 + }
1.160 + setWritePosition(0);
1.161 + }
1.162 +
1.163 + return result;
1.164 +}
1.165 +
1.166 +
1.167 +StaticIndexBufferInterface::StaticIndexBufferInterface(Renderer *renderer) : IndexBufferInterface(renderer, false)
1.168 +{
1.169 +}
1.170 +
1.171 +StaticIndexBufferInterface::~StaticIndexBufferInterface()
1.172 +{
1.173 +}
1.174 +
1.175 +bool StaticIndexBufferInterface::reserveBufferSpace(unsigned int size, GLenum indexType)
1.176 +{
1.177 + unsigned int curSize = getBufferSize();
1.178 + if (curSize == 0)
1.179 + {
1.180 + return setBufferSize(size, indexType);
1.181 + }
1.182 + else if (curSize >= size && indexType == getIndexType())
1.183 + {
1.184 + return true;
1.185 + }
1.186 + else
1.187 + {
1.188 + ERR("Static index buffers can't be resized");
1.189 + UNREACHABLE();
1.190 + return false;
1.191 + }
1.192 +}
1.193 +
1.194 +IndexRangeCache *StaticIndexBufferInterface::getIndexRangeCache()
1.195 +{
1.196 + return &mIndexRangeCache;
1.197 +}
1.198 +
1.199 +}
1.200 +
