kc3-lang/angle/src/common/blocklayout.h

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• Hash : 42bcf32e
  Author :
  Date : 2014-08-25T16:20:46
  

  Refactor ShaderVariables to store fields in the base.
  
  Instead of only storing structure information in Varyings, Uniforms
  and Interface Block Fields, store it in the base class. Also only
  store base variable information for struct fields, instead of fully
  typed information. This works because stuff like interpolation type,
  invariance, and other properties are for the entire variable, not
  individual fields.
  
  Also add new fields for interface block instance name, varying
  invariance and structure name for all struct types.
  
  BUG=angle:466
  
  Change-Id: If03fc071e6becb7aad6dea5093989bba7daee69e
  Reviewed-on: https://chromium-review.googlesource.com/213501
  Reviewed-by: Zhenyao Mo <zmo@chromium.org>
  Tested-by: Jamie Madill <jmadill@chromium.org>
  Reviewed-by: Nicolas Capens <capn@chromium.org>
  

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• src/common/blocklayout.h

• //
  // Copyright (c) 2013-2014 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.
  //
  // blocklayout.h:
  //   Methods and classes related to uniform layout and packing in GLSL and HLSL.
  //
  
  #ifndef COMMON_BLOCKLAYOUT_H_
  #define COMMON_BLOCKLAYOUT_H_
  
  #include <cstddef>
  #include <vector>
  
  #include "angle_gl.h"
  #include <GLSLANG/ShaderLang.h>
  
  namespace sh
  {
  struct ShaderVariable;
  struct InterfaceBlockField;
  struct Uniform;
  struct Varying;
  struct InterfaceBlock;
  
  struct BlockMemberInfo
  {
      BlockMemberInfo(int offset, int arrayStride, int matrixStride, bool isRowMajorMatrix)
          : offset(offset),
            arrayStride(arrayStride),
            matrixStride(matrixStride),
            isRowMajorMatrix(isRowMajorMatrix)
      {}
  
      static BlockMemberInfo getDefaultBlockInfo()
      {
          return BlockMemberInfo(-1, -1, -1, false);
      }
  
      int offset;
      int arrayStride;
      int matrixStride;
      bool isRowMajorMatrix;
  };
  
  class BlockLayoutEncoder
  {
    public:
      BlockLayoutEncoder();
  
      template <typename VarT>
      void encodeVariables(const std::vector<VarT> &fields);
  
      BlockMemberInfo encodeVariable(const sh::ShaderVariable &field);
      BlockMemberInfo encodeVariable(const InterfaceBlockField &field);
  
      void encodeType(GLenum type, unsigned int arraySize, bool isRowMajorMatrix);
  
      size_t getBlockSize() const { return mCurrentOffset * BytesPerComponent; }
      size_t getCurrentRegister() const { return mCurrentOffset / ComponentsPerRegister; }
      size_t getCurrentElement() const { return mCurrentOffset % ComponentsPerRegister; }
  
      virtual void enterAggregateType() = 0;
      virtual void exitAggregateType() = 0;
  
      static const size_t BytesPerComponent = 4u;
      static const unsigned int ComponentsPerRegister = 4u;
  
    protected:
      size_t mCurrentOffset;
      bool mInRowMajorField;
  
      void nextRegister();
  
      virtual void getBlockLayoutInfo(GLenum type, unsigned int arraySize, bool isRowMajorMatrix, int *arrayStrideOut, int *matrixStrideOut) = 0;
      virtual void advanceOffset(GLenum type, unsigned int arraySize, bool isRowMajorMatrix, int arrayStride, int matrixStride) = 0;
  };
  
  // Block layout according to the std140 block layout
  // See "Standard Uniform Block Layout" in Section 2.11.6 of the OpenGL ES 3.0 specification
  
  class Std140BlockEncoder : public BlockLayoutEncoder
  {
    public:
      Std140BlockEncoder();
  
      virtual void enterAggregateType();
      virtual void exitAggregateType();
  
    protected:
      virtual void getBlockLayoutInfo(GLenum type, unsigned int arraySize, bool isRowMajorMatrix, int *arrayStrideOut, int *matrixStrideOut);
      virtual void advanceOffset(GLenum type, unsigned int arraySize, bool isRowMajorMatrix, int arrayStride, int matrixStride);
  };
  
  // Block layout packed according to the D3D9 or default D3D10+ register packing rules
  // See http://msdn.microsoft.com/en-us/library/windows/desktop/bb509632(v=vs.85).aspx
  // The strategy should be ENCODE_LOOSE for D3D9 constant blocks, and ENCODE_PACKED
  // for everything else (D3D10+ constant blocks and all attributes/varyings).
  
  class HLSLBlockEncoder : public BlockLayoutEncoder
  {
    public:
      enum HLSLBlockEncoderStrategy
      {
          ENCODE_PACKED,
          ENCODE_LOOSE
      };
  
      HLSLBlockEncoder(HLSLBlockEncoderStrategy strategy);
  
      virtual void enterAggregateType();
      virtual void exitAggregateType();
      void skipRegisters(unsigned int numRegisters);
  
      bool isPacked() const { return mEncoderStrategy == ENCODE_PACKED; }
  
      static HLSLBlockEncoderStrategy GetStrategyFor(ShShaderOutput outputType);
  
    protected:
      virtual void getBlockLayoutInfo(GLenum type, unsigned int arraySize, bool isRowMajorMatrix, int *arrayStrideOut, int *matrixStrideOut);
      virtual void advanceOffset(GLenum type, unsigned int arraySize, bool isRowMajorMatrix, int arrayStride, int matrixStride);
  
      HLSLBlockEncoderStrategy mEncoderStrategy;
  };
  
  // This method returns the number of used registers for a ShaderVariable. It is dependent on the HLSLBlockEncoder
  // class to count the number of used registers in a struct (which are individually packed according to the same rules).
  unsigned int HLSLVariableRegisterCount(const Varying &variable);
  unsigned int HLSLVariableRegisterCount(const Uniform &variable, ShShaderOutput outputType);
  
  }
  
  #endif // COMMON_BLOCKLAYOUT_H_
  

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