kc3-lang/angle/src/compiler/translator/blocklayout.h

• Show log

  Commit

• Hash : 1bfa6b71
  Author :
  Date : 2017-10-13T14:07:45
  

  Generalize GetUniformBlockInfo.
  
  This method is useful for the Vulkan back-end as well as D3D11. It can
  produce a uniform block layout for the default uniform blocks as well
  as for interface blocks. Put it in blocklayout.h in the translator.
  
  BUG=angleproject:2167
  
  Change-Id: I13160906921da439746c1811a623006250aaeefd
  Reviewed-on: https://chromium-review.googlesource.com/713941
  Reviewed-by: Frank Henigman <fjhenigman@chromium.org>
  Reviewed-by: Geoff Lang <geofflang@chromium.org>
  Commit-Queue: Jamie Madill <jmadill@chromium.org>
  

Download

• src/compiler/translator/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 <map>
  #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() : offset(-1), arrayStride(-1), matrixStride(-1), isRowMajorMatrix(false) {}
  
      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();
      virtual ~BlockLayoutEncoder() {}
  
      BlockMemberInfo encodeType(GLenum type, unsigned int arraySize, bool isRowMajorMatrix);
  
      size_t getBlockSize() const { return mCurrentOffset * BytesPerComponent; }
  
      virtual void enterAggregateType() = 0;
      virtual void exitAggregateType()  = 0;
  
      static const size_t BytesPerComponent           = 4u;
      static const unsigned int ComponentsPerRegister = 4u;
  
      static size_t getBlockRegister(const BlockMemberInfo &info);
      static size_t getBlockRegisterElement(const BlockMemberInfo &info);
  
    protected:
      size_t mCurrentOffset;
  
      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();
  
      void enterAggregateType() override;
      void exitAggregateType() override;
  
    protected:
      void getBlockLayoutInfo(GLenum type,
                              unsigned int arraySize,
                              bool isRowMajorMatrix,
                              int *arrayStrideOut,
                              int *matrixStrideOut) override;
      void advanceOffset(GLenum type,
                         unsigned int arraySize,
                         bool isRowMajorMatrix,
                         int arrayStride,
                         int matrixStride) override;
  };
  
  using BlockLayoutMap = std::map<std::string, BlockMemberInfo>;
  
  // Only valid to call with ShaderVariable, InterfaceBlockField and Uniform.
  template <typename VarT>
  void GetUniformBlockInfo(const std::vector<VarT> &fields,
                           const std::string &prefix,
                           sh::BlockLayoutEncoder *encoder,
                           bool inRowMajorLayout,
                           BlockLayoutMap *blockLayoutMap);
  
  }  // namespace sh
  
  #endif  // COMMON_BLOCKLAYOUT_H_
  

Download