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

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• Hash : 9d737966
  Author :
  Date : 2019-08-14T12:25:12
  

  Standardize copyright notices to project style
  
  For all "ANGLE Project" copyrights, standardize to the format specified
  by the style guide. Changes:
  - "Copyright (c)" and "Copyright(c)" changed to just "Copyright".
  - Removed the second half of date ranges ("Y1Y1-Y2Y2"->"Y1Y1").
  - Fixed a small number of files that had no copyright date using the
    initial commit year from the version control history.
  - Fixed one instance of copyright being "The ANGLE Project" rather than
    "The ANGLE Project Authors"
  
  These changes are applied both to the copyright of source file, and
  where applicable to copyright statements that are generated by
  templates.
  
  BUG=angleproject:3811
  
  Change-Id: I973dd65e4ef9deeba232d5be74c768256a0eb2e5
  Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1754397
  Commit-Queue: Jamie Madill <jmadill@chromium.org>
  Reviewed-by: Jamie Madill <jmadill@chromium.org>
  

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

• //
  // Copyright 2002 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/Context.h"
  #include "libANGLE/renderer/d3d/ContextD3D.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(BufferFactoryD3D *factory, bool dynamic)
  {
      mIndexBuffer = factory->createIndexBuffer();
  
      mDynamic       = dynamic;
      mWritePosition = 0;
  }
  
  IndexBufferInterface::~IndexBufferInterface()
  {
      if (mIndexBuffer)
      {
          delete mIndexBuffer;
      }
  }
  
  gl::DrawElementsType IndexBufferInterface::getIndexType() const
  {
      return mIndexBuffer->getIndexType();
  }
  
  unsigned int IndexBufferInterface::getBufferSize() const
  {
      return mIndexBuffer->getBufferSize();
  }
  
  unsigned int IndexBufferInterface::getSerial() const
  {
      return mIndexBuffer->getSerial();
  }
  
  angle::Result IndexBufferInterface::mapBuffer(const gl::Context *context,
                                                unsigned int size,
                                                void **outMappedMemory,
                                                unsigned int *streamOffset)
  {
      // Protect against integer overflow
      bool check = (mWritePosition + size < mWritePosition);
      ANGLE_CHECK(GetImplAs<ContextD3D>(context), !check,
                  "Mapping of internal index buffer would cause an integer overflow.",
                  GL_OUT_OF_MEMORY);
  
      angle::Result error = mIndexBuffer->mapBuffer(context, mWritePosition, size, outMappedMemory);
      if (error == angle::Result::Stop)
      {
          if (outMappedMemory)
          {
              *outMappedMemory = nullptr;
          }
          return error;
      }
  
      if (streamOffset)
      {
          *streamOffset = mWritePosition;
      }
  
      mWritePosition += size;
      return angle::Result::Continue;
  }
  
  angle::Result IndexBufferInterface::unmapBuffer(const gl::Context *context)
  {
      return mIndexBuffer->unmapBuffer(context);
  }
  
  IndexBuffer *IndexBufferInterface::getIndexBuffer() const
  {
      return mIndexBuffer;
  }
  
  unsigned int IndexBufferInterface::getWritePosition() const
  {
      return mWritePosition;
  }
  
  void IndexBufferInterface::setWritePosition(unsigned int writePosition)
  {
      mWritePosition = writePosition;
  }
  
  angle::Result IndexBufferInterface::discard(const gl::Context *context)
  {
      return mIndexBuffer->discard(context);
  }
  
  angle::Result IndexBufferInterface::setBufferSize(const gl::Context *context,
                                                    unsigned int bufferSize,
                                                    gl::DrawElementsType indexType)
  {
      if (mIndexBuffer->getBufferSize() == 0)
      {
          return mIndexBuffer->initialize(context, bufferSize, indexType, mDynamic);
      }
      else
      {
          return mIndexBuffer->setSize(context, bufferSize, indexType);
      }
  }
  
  StreamingIndexBufferInterface::StreamingIndexBufferInterface(BufferFactoryD3D *factory)
      : IndexBufferInterface(factory, true)
  {}
  
  StreamingIndexBufferInterface::~StreamingIndexBufferInterface() {}
  
  angle::Result StreamingIndexBufferInterface::reserveBufferSpace(const gl::Context *context,
                                                                  unsigned int size,
                                                                  gl::DrawElementsType indexType)
  {
      unsigned int curBufferSize = getBufferSize();
      unsigned int writePos      = getWritePosition();
      if (size > curBufferSize)
      {
          ANGLE_TRY(setBufferSize(context, std::max(size, 2 * curBufferSize), indexType));
          setWritePosition(0);
      }
      else if (writePos + size > curBufferSize || writePos + size < writePos)
      {
          ANGLE_TRY(discard(context));
          setWritePosition(0);
      }
  
      return angle::Result::Continue;
  }
  
  StaticIndexBufferInterface::StaticIndexBufferInterface(BufferFactoryD3D *factory)
      : IndexBufferInterface(factory, false)
  {}
  
  StaticIndexBufferInterface::~StaticIndexBufferInterface() {}
  
  angle::Result StaticIndexBufferInterface::reserveBufferSpace(const gl::Context *context,
                                                               unsigned int size,
                                                               gl::DrawElementsType indexType)
  {
      unsigned int curSize = getBufferSize();
      if (curSize == 0)
      {
          return setBufferSize(context, size, indexType);
      }
  
      ASSERT(curSize >= size && indexType == getIndexType());
      return angle::Result::Continue;
  }
  
  }  // namespace rx
  

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