kc3-lang/angle/src/libGLESv2/renderer/d3d/d3d11/VertexBuffer11.cpp

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• Hash : aff8084b
  Author :
  Date : 2014-08-04T10:47:56
  

  Fix VertexBuffer11::getSpaceRequired for instanced attribs.
  
  The computation could copy more data than needed. Although benign
  it could cause performance degredation compared to the D3D9 back
  end.
  
  Change-Id: I3cf1dc79085c33d44040fd55153e63a4e5e63cb1
  Reviewed-on: https://chromium-review.googlesource.com/210640
  Tested-by: Jamie Madill <jmadill@chromium.org>
  Reviewed-by: Nicolas Capens <capn@chromium.org>
  

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• src/libGLESv2/renderer/d3d/d3d11/VertexBuffer11.cpp

• #include "precompiled.h"
  //
  // Copyright (c) 2013 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.
  //
  
  // VertexBuffer11.cpp: Defines the D3D11 VertexBuffer implementation.
  
  #include "libGLESv2/renderer/d3d/d3d11/VertexBuffer11.h"
  #include "libGLESv2/renderer/d3d/d3d11/Buffer11.h"
  
  #include "libGLESv2/Buffer.h"
  #include "libGLESv2/renderer/d3d/d3d11/Renderer11.h"
  #include "libGLESv2/VertexAttribute.h"
  #include "libGLESv2/renderer/d3d/d3d11/formatutils11.h"
  
  namespace rx
  {
  
  VertexBuffer11::VertexBuffer11(rx::Renderer11 *const renderer) : mRenderer(renderer)
  {
      mBuffer = NULL;
      mBufferSize = 0;
      mDynamicUsage = false;
  }
  
  VertexBuffer11::~VertexBuffer11()
  {
      SafeRelease(mBuffer);
  }
  
  bool VertexBuffer11::initialize(unsigned int size, bool dynamicUsage)
  {
      SafeRelease(mBuffer);
  
      updateSerial();
  
      if (size > 0)
      {
          ID3D11Device* dxDevice = mRenderer->getDevice();
  
          D3D11_BUFFER_DESC bufferDesc;
          bufferDesc.ByteWidth = size;
          bufferDesc.Usage = D3D11_USAGE_DYNAMIC;
          bufferDesc.BindFlags = D3D11_BIND_VERTEX_BUFFER;
          bufferDesc.CPUAccessFlags = D3D11_CPU_ACCESS_WRITE;
          bufferDesc.MiscFlags = 0;
          bufferDesc.StructureByteStride = 0;
  
          HRESULT result = dxDevice->CreateBuffer(&bufferDesc, NULL, &mBuffer);
          if (FAILED(result))
          {
              return false;
          }
      }
  
      mBufferSize = size;
      mDynamicUsage = dynamicUsage;
      return true;
  }
  
  VertexBuffer11 *VertexBuffer11::makeVertexBuffer11(VertexBuffer *vetexBuffer)
  {
      ASSERT(HAS_DYNAMIC_TYPE(VertexBuffer11*, vetexBuffer));
      return static_cast<VertexBuffer11*>(vetexBuffer);
  }
  
  bool VertexBuffer11::storeVertexAttributes(const gl::VertexAttribute &attrib, const gl::VertexAttribCurrentValueData &currentValue,
                                             GLint start, GLsizei count, GLsizei instances, unsigned int offset)
  {
      if (mBuffer)
      {
          gl::Buffer *buffer = attrib.buffer.get();
          int inputStride = ComputeVertexAttributeStride(attrib);
          ID3D11DeviceContext *dxContext = mRenderer->getDeviceContext();
  
          D3D11_MAPPED_SUBRESOURCE mappedResource;
          HRESULT result = dxContext->Map(mBuffer, 0, D3D11_MAP_WRITE_NO_OVERWRITE, 0, &mappedResource);
          if (FAILED(result))
          {
              ERR("Vertex buffer map failed with error 0x%08x", result);
              return false;
          }
  
          char* output = reinterpret_cast<char*>(mappedResource.pData) + offset;
  
          const char *input = NULL;
          if (attrib.enabled)
          {
              if (buffer)
              {
                  Buffer11 *storage = Buffer11::makeBuffer11(buffer->getImplementation());
                  input = static_cast<const char*>(storage->getData()) + static_cast<int>(attrib.offset);
              }
              else
              {
                  input = static_cast<const char*>(attrib.pointer);
              }
          }
          else
          {
              input = reinterpret_cast<const char*>(currentValue.FloatValues);
          }
  
          if (instances == 0 || attrib.divisor == 0)
          {
              input += inputStride * start;
          }
  
          gl::VertexFormat vertexFormat(attrib, currentValue.Type);
          VertexCopyFunction conversionFunc = gl_d3d11::GetVertexCopyFunction(vertexFormat);
          ASSERT(conversionFunc != NULL);
          conversionFunc(input, inputStride, count, output);
  
          dxContext->Unmap(mBuffer, 0);
  
          return true;
      }
      else
      {
          ERR("Vertex buffer not initialized.");
          return false;
      }
  }
  
  bool VertexBuffer11::getSpaceRequired(const gl::VertexAttribute &attrib, GLsizei count,
                                        GLsizei instances, unsigned int *outSpaceRequired) const
  {
      unsigned int elementCount = 0;
      if (attrib.enabled)
      {
          if (instances == 0 || attrib.divisor == 0)
          {
              elementCount = count;
          }
          else
          {
              // Round up to divisor, if possible
              elementCount = rx::UnsignedCeilDivide(static_cast<unsigned int>(instances), attrib.divisor);
          }
  
          gl::VertexFormat vertexFormat(attrib);
          unsigned int elementSize = static_cast<unsigned int>(gl_d3d11::GetVertexElementSize(vertexFormat));
          if (elementSize <= std::numeric_limits<unsigned int>::max() / elementCount)
          {
              if (outSpaceRequired)
              {
                  *outSpaceRequired = elementSize * elementCount;
              }
              return true;
          }
          else
          {
              return false;
          }
      }
      else
      {
          const unsigned int elementSize = 4;
          if (outSpaceRequired)
          {
              *outSpaceRequired = elementSize * 4;
          }
          return true;
      }
  }
  
  unsigned int VertexBuffer11::getBufferSize() const
  {
      return mBufferSize;
  }
  
  bool VertexBuffer11::setBufferSize(unsigned int size)
  {
      if (size > mBufferSize)
      {
          return initialize(size, mDynamicUsage);
      }
      else
      {
          return true;
      }
  }
  
  bool VertexBuffer11::discard()
  {
      if (mBuffer)
      {
          ID3D11DeviceContext *dxContext = mRenderer->getDeviceContext();
  
          D3D11_MAPPED_SUBRESOURCE mappedResource;
          HRESULT result = dxContext->Map(mBuffer, 0, D3D11_MAP_WRITE_DISCARD, 0, &mappedResource);
          if (FAILED(result))
          {
              ERR("Vertex buffer map failed with error 0x%08x", result);
              return false;
          }
  
          dxContext->Unmap(mBuffer, 0);
  
          return true;
      }
      else
      {
          ERR("Vertex buffer not initialized.");
          return false;
      }
  }
  
  ID3D11Buffer *VertexBuffer11::getBuffer() const
  {
      return mBuffer;
  }
  
  }
  

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