kc3-lang/angle/src/libANGLE/renderer/d3d/IndexBuffer.cpp

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• Hash : 2b5420c0
  Author :
  Date : 2014-11-19T14:20:15
  

  Merge libGLESv2 and libEGL classes into libANGLE.
  
  BUG=angle:733
  
  Change-Id: Ic491c971411fe82c56cd97c5c8325ac14ec218df
  Reviewed-on: https://chromium-review.googlesource.com/230830
  Reviewed-by: Geoff Lang <geofflang@chromium.org>
  Tested-by: Geoff Lang <geofflang@chromium.org>
  

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• src/libANGLE/renderer/d3d/IndexBuffer.cpp

• //
  // Copyright (c) 2002-2012 The ANGLE Project Authors. All rights reserved.
  // Use of this source code is governed by a BSD-style license that can be
  // found in the LICENSE file.
  //
  
  // IndexBuffer.cpp: Defines the abstract IndexBuffer class and IndexBufferInterface
  // class with derivations, classes that perform graphics API agnostic index buffer operations.
  
  #include "libANGLE/renderer/d3d/IndexBuffer.h"
  #include "libANGLE/renderer/d3d/RendererD3D.h"
  
  namespace rx
  {
  
  unsigned int IndexBuffer::mNextSerial = 1;
  
  IndexBuffer::IndexBuffer()
  {
      updateSerial();
  }
  
  IndexBuffer::~IndexBuffer()
  {
  }
  
  unsigned int IndexBuffer::getSerial() const
  {
      return mSerial;
  }
  
  void IndexBuffer::updateSerial()
  {
      mSerial = mNextSerial++;
  }
  
  
  IndexBufferInterface::IndexBufferInterface(RendererD3D *renderer, bool dynamic) : mRenderer(renderer)
  {
      mIndexBuffer = renderer->createIndexBuffer();
  
      mDynamic = dynamic;
      mWritePosition = 0;
  }
  
  IndexBufferInterface::~IndexBufferInterface()
  {
      if (mIndexBuffer)
      {
          delete mIndexBuffer;
      }
  }
  
  GLenum IndexBufferInterface::getIndexType() const
  {
      return mIndexBuffer->getIndexType();
  }
  
  unsigned int IndexBufferInterface::getBufferSize() const
  {
      return mIndexBuffer->getBufferSize();
  }
  
  unsigned int IndexBufferInterface::getSerial() const
  {
      return mIndexBuffer->getSerial();
  }
  
  gl::Error IndexBufferInterface::mapBuffer(unsigned int size, void** outMappedMemory, unsigned int *streamOffset)
  {
      // Protect against integer overflow
      if (mWritePosition + size < mWritePosition)
      {
          return gl::Error(GL_OUT_OF_MEMORY, "Mapping of internal index buffer would cause an integer overflow.");
      }
  
      gl::Error error = mIndexBuffer->mapBuffer(mWritePosition, size, outMappedMemory);
      if (error.isError())
      {
          if (outMappedMemory)
          {
              *outMappedMemory = NULL;
          }
          return error;
      }
  
      if (streamOffset)
      {
          *streamOffset = mWritePosition;
      }
  
      mWritePosition += size;
      return gl::Error(GL_NO_ERROR);
  }
  
  gl::Error IndexBufferInterface::unmapBuffer()
  {
      return mIndexBuffer->unmapBuffer();
  }
  
  IndexBuffer * IndexBufferInterface::getIndexBuffer() const
  {
      return mIndexBuffer;
  }
  
  unsigned int IndexBufferInterface::getWritePosition() const
  {
      return mWritePosition;
  }
  
  void IndexBufferInterface::setWritePosition(unsigned int writePosition)
  {
      mWritePosition = writePosition;
  }
  
  gl::Error IndexBufferInterface::discard()
  {
      return mIndexBuffer->discard();
  }
  
  gl::Error IndexBufferInterface::setBufferSize(unsigned int bufferSize, GLenum indexType)
  {
      if (mIndexBuffer->getBufferSize() == 0)
      {
          return mIndexBuffer->initialize(bufferSize, indexType, mDynamic);
      }
      else
      {
          return mIndexBuffer->setSize(bufferSize, indexType);
      }
  }
  
  StreamingIndexBufferInterface::StreamingIndexBufferInterface(RendererD3D *renderer) : IndexBufferInterface(renderer, true)
  {
  }
  
  StreamingIndexBufferInterface::~StreamingIndexBufferInterface()
  {
  }
  
  gl::Error StreamingIndexBufferInterface::reserveBufferSpace(unsigned int size, GLenum indexType)
  {
      unsigned int curBufferSize = getBufferSize();
      unsigned int writePos = getWritePosition();
      if (size > curBufferSize)
      {
          gl::Error error = setBufferSize(std::max(size, 2 * curBufferSize), indexType);
          if (error.isError())
          {
              return error;
          }
          setWritePosition(0);
      }
      else if (writePos + size > curBufferSize || writePos + size < writePos)
      {
          gl::Error error = discard();
          if (error.isError())
          {
              return error;
          }
          setWritePosition(0);
      }
  
      return gl::Error(GL_NO_ERROR);
  }
  
  
  StaticIndexBufferInterface::StaticIndexBufferInterface(RendererD3D *renderer) : IndexBufferInterface(renderer, false)
  {
  }
  
  StaticIndexBufferInterface::~StaticIndexBufferInterface()
  {
  }
  
  gl::Error StaticIndexBufferInterface::reserveBufferSpace(unsigned int size, GLenum indexType)
  {
      unsigned int curSize = getBufferSize();
      if (curSize == 0)
      {
          return setBufferSize(size, indexType);
      }
      else if (curSize >= size && indexType == getIndexType())
      {
          return gl::Error(GL_NO_ERROR);
      }
      else
      {
          UNREACHABLE();
          return gl::Error(GL_INVALID_OPERATION, "Internal static index buffers can't be resized");
      }
  }
  
  IndexRangeCache *StaticIndexBufferInterface::getIndexRangeCache()
  {
      return &mIndexRangeCache;
  }
  
  }
  

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