kc3-lang/angle/src/libANGLE/renderer/d3d/BufferD3D.cpp

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• Hash : 520c4ae2
  Author :
  Date : 2015-05-05T13:12:36
  

  Add a Buffer::getIndexRange function.
  
  Instead of exposing the index range cache, add a more generic method that
  allows the buffers to handle their own caching of index ranges.
  BufferImpl::getData can be hard to implement for BufferGL because there
  isn't a way to tell the buffer to unmap and glGetBufferSubData can be very
  expensive, requiring an extra copy of the data.
  
  BUG=angleproject:881
  
  Change-Id: Idec645219056132e0d72a410fbe7b971fa02c9e9
  Reviewed-on: https://chromium-review.googlesource.com/261892
  Reviewed-by: Jamie Madill <jmadill@chromium.org>
  Reviewed-by: Olli Etuaho <oetuaho@nvidia.com>
  Tested-by: Geoff Lang <geofflang@chromium.org>
  

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• src/libANGLE/renderer/d3d/BufferD3D.cpp

• //
  // Copyright 2014 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.
  //
  
  // BufferD3D.cpp Defines common functionality between the Buffer9 and Buffer11 classes.
  
  #include "libANGLE/renderer/d3d/BufferD3D.h"
  
  #include "common/utilities.h"
  #include "libANGLE/renderer/d3d/IndexBuffer.h"
  #include "libANGLE/renderer/d3d/VertexBuffer.h"
  
  namespace rx
  {
  
  unsigned int BufferD3D::mNextSerial = 1;
  
  BufferD3D::BufferD3D(BufferFactoryD3D *factory)
      : BufferImpl(),
        mFactory(factory),
        mStaticVertexBuffer(nullptr),
        mStaticIndexBuffer(nullptr),
        mUnmodifiedDataUse(0)
  {
      updateSerial();
  }
  
  BufferD3D::~BufferD3D()
  {
      SafeDelete(mStaticVertexBuffer);
      SafeDelete(mStaticIndexBuffer);
  }
  
  void BufferD3D::updateSerial()
  {
      mSerial = mNextSerial++;
  }
  
  void BufferD3D::initializeStaticData()
  {
      if (!mStaticVertexBuffer)
      {
          mStaticVertexBuffer = new StaticVertexBufferInterface(mFactory);
      }
      if (!mStaticIndexBuffer)
      {
          mStaticIndexBuffer = new StaticIndexBufferInterface(mFactory);
      }
  }
  
  void BufferD3D::invalidateStaticData()
  {
      if ((mStaticVertexBuffer && mStaticVertexBuffer->getBufferSize() != 0) || (mStaticIndexBuffer && mStaticIndexBuffer->getBufferSize() != 0))
      {
          SafeDelete(mStaticVertexBuffer);
          SafeDelete(mStaticIndexBuffer);
  
          // Re-init static data to track that we're in a static buffer
          initializeStaticData();
      }
  
      mUnmodifiedDataUse = 0;
  }
  
  // Creates static buffers if sufficient used data has been left unmodified
  void BufferD3D::promoteStaticUsage(int dataSize)
  {
      if (!mStaticVertexBuffer && !mStaticIndexBuffer)
      {
          mUnmodifiedDataUse += dataSize;
  
          if (mUnmodifiedDataUse > 3 * getSize())
          {
              initializeStaticData();
          }
      }
  }
  
  gl::Error BufferD3D::getIndexRange(GLenum type, size_t offset, size_t count, gl::RangeUI *outRange)
  {
      const uint8_t *data = nullptr;
      gl::Error error = getData(&data);
      if (error.isError())
      {
          return error;
      }
  
      *outRange = gl::ComputeIndexRange(type, data + offset, count);
      return gl::Error(GL_NO_ERROR);
  }
  
  }
  

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