kc3-lang/angle/src/libGLESv2/renderer/IndexBuffer.cpp

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• Author : Geoff Lang
  Date : 2013-08-02 11:54:08
  Hash : a36ead4a
  Message : Updated VertexBuffer's getSpaceRequired and storeVertexAttributes methods to return bools and fixed some validation of parameters to prevent under and overflows. TRAC #23643 Signed-off-by: Nicolas Capens Signed-off-by: Shannon Woods Author: Geoff Lang

• src/libGLESv2/renderer/IndexBuffer.cpp

• #include "precompiled.h"
  //
  // 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 "libGLESv2/renderer/IndexBuffer.h"
  #include "libGLESv2/renderer/Renderer.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(Renderer *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();
  }
  
  bool IndexBufferInterface::mapBuffer(unsigned int size, void** outMappedMemory, unsigned int *streamOffset)
  {
      // Protect against integer overflow
      if (mWritePosition + size < mWritePosition)
      {
          return false;
      }
  
      if (!mIndexBuffer->mapBuffer(mWritePosition, size, outMappedMemory))
      {
          if (outMappedMemory)
          {
              *outMappedMemory = NULL;
          }
          return false;
      }
  
      if (streamOffset)
      {
          *streamOffset = mWritePosition;
      }
  
      mWritePosition += size;
      return true;
  }
  
  bool 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;
  }
  
  bool IndexBufferInterface::discard()
  {
      return mIndexBuffer->discard();
  }
  
  bool 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(Renderer *renderer) : IndexBufferInterface(renderer, true)
  {
  }
  
  StreamingIndexBufferInterface::~StreamingIndexBufferInterface()
  {
  }
  
  bool StreamingIndexBufferInterface::reserveBufferSpace(unsigned int size, GLenum indexType)
  {
      bool result = true;
      unsigned int curBufferSize = getBufferSize();
      unsigned int writePos = getWritePosition();
      if (size > curBufferSize)
      {
          result = setBufferSize(std::max(size, 2 * curBufferSize), indexType);
          setWritePosition(0);
      }
      else if (writePos + size > curBufferSize || writePos + size < writePos)
      {
          if (!discard())
          {
              return false;
          }
          setWritePosition(0);
      }
  
      return result;
  }
  
  
  StaticIndexBufferInterface::StaticIndexBufferInterface(Renderer *renderer) : IndexBufferInterface(renderer, false)
  {
  }
  
  StaticIndexBufferInterface::~StaticIndexBufferInterface()
  {
  }
  
  bool 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 true;
      }
      else
      {
          ERR("Static index buffers can't be resized");
          UNREACHABLE();
          return false;
      }
  }
  
  IndexRangeCache *StaticIndexBufferInterface::getIndexRangeCache()
  {
      return &mIndexRangeCache;
  }
  
  }