kc3-lang/angle/src/compiler/BlockLayoutEncoder.cpp

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• Author : Jamie Madill
  Date : 2013-06-20 11:55:56
  Hash : 919b066a
  Message : For the reported std140 layout to be consistent with the spec. TRAC #23083 Signed-off-by: Nicolas Capens Signed-off-by: Shannon Woods Authored-by: Jamie Madill

• src/compiler/BlockLayoutEncoder.cpp

• //
  // 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.
  //
  
  #include "compiler/BlockLayoutEncoder.h"
  #include "compiler/Uniform.h"
  #include "common/mathutil.h"
  #include "common/utilities.h"
  
  namespace sh
  {
  
  BlockLayoutEncoder::BlockLayoutEncoder(std::vector<BlockMemberInfo> *blockInfoOut)
      : mCurrentOffset(0),
        mBlockInfoOut(blockInfoOut)
  {
  }
  
  void BlockLayoutEncoder::encodeFields(const std::vector<Uniform> &fields)
  {
      for (unsigned int fieldIndex = 0; fieldIndex < fields.size(); fieldIndex++)
      {
          const Uniform &uniform = fields[fieldIndex];
  
          if (uniform.fields.size() > 0)
          {
              const unsigned int elementCount = std::max(1u, uniform.arraySize);
  
              for (unsigned int elementIndex = 0; elementIndex < elementCount; elementIndex++)
              {
                  enterAggregateType();
                  encodeFields(uniform.fields);
                  exitAggregateType();
              }
          }
          else
          {
              encodeType(uniform);
          }
      }
  }
  
  void BlockLayoutEncoder::encodeType(const Uniform &uniform)
  {
      int arrayStride;
      int matrixStride;
  
      getBlockLayoutInfo(uniform, &arrayStride, &matrixStride);
  
      const BlockMemberInfo memberInfo(mCurrentOffset * ComponentSize, arrayStride * ComponentSize, matrixStride * ComponentSize, uniform.isRowMajorMatrix);
      mBlockInfoOut->push_back(memberInfo);
  
      advanceOffset(uniform, arrayStride, matrixStride);
  }
  
  void BlockLayoutEncoder::nextRegister()
  {
      mCurrentOffset = rx::roundUp(mCurrentOffset, RegisterSize);
  }
  
  Std140BlockEncoder::Std140BlockEncoder(std::vector<BlockMemberInfo> *blockInfoOut)
      : BlockLayoutEncoder(blockInfoOut)
  {
  }
  
  void Std140BlockEncoder::enterAggregateType()
  {
      nextRegister();
  }
  
  void Std140BlockEncoder::exitAggregateType()
  {
      nextRegister();
  }
  
  void Std140BlockEncoder::getBlockLayoutInfo(const Uniform &uniform, int *arrayStrideOut, int *matrixStrideOut)
  {
      ASSERT(uniform.fields.empty());
  
      // We assume we are only dealing with 4 byte components (no doubles or half-words currently)
      ASSERT(gl::UniformComponentSize(gl::UniformComponentType(uniform.type)) == ComponentSize);
  
      int numComponents = gl::UniformComponentCount(uniform.type);
      size_t baseAlignment = 0;
      int matrixStride = 0;
      int arrayStride = 0;
  
      if (gl::IsMatrixType(uniform.type))
      {
          baseAlignment = RegisterSize;
          matrixStride = RegisterSize;
  
          if (uniform.arraySize > 0)
          {
              const int numRegisters = gl::MatrixRegisterCount(uniform.type, uniform.isRowMajorMatrix);
              arrayStride = RegisterSize * numRegisters;
          }
      }
      else if (uniform.arraySize > 0)
      {
          baseAlignment = RegisterSize;
          arrayStride = RegisterSize;
      }
      else
      {
          const int numComponents = gl::UniformComponentCount(uniform.type);
          baseAlignment = (numComponents == 3 ? 4u : static_cast<size_t>(numComponents));
      }
  
      mCurrentOffset = rx::roundUp(mCurrentOffset, baseAlignment);
  
      *matrixStrideOut = matrixStride;
      *arrayStrideOut = arrayStride;
  }
  
  void Std140BlockEncoder::advanceOffset(const Uniform &uniform, int arrayStride, int matrixStride)
  {
      if (uniform.arraySize > 0)
      {
          mCurrentOffset += arrayStride * uniform.arraySize;
      }
      else if (gl::IsMatrixType(uniform.type))
      {
          ASSERT(matrixStride == RegisterSize);
          const int numRegisters = gl::MatrixRegisterCount(uniform.type, uniform.isRowMajorMatrix);
          mCurrentOffset += RegisterSize * numRegisters;
      }
      else
      {
          mCurrentOffset += gl::UniformComponentCount(uniform.type);
      }
  }
  
  }