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

Branch : - branch - main - tag -

• Show log

  Commit

• Author : Geoff Lang
  Date : 2013-08-29 13:46:49
  Hash : 17732823
  Message : Moved the compiler source files into directories based on their project and added a compiler.gypi to generate the compiler projects.

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