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

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• Author : Jamie Madill
  Date : 2014-06-25 16:04:57
  Hash : f51639a4
  Message : Use a common include for GL headers. A common place to define required GL includes gives us a nice point to centralize GL customizations. In the header currently are the basic GLES headers with extensions, and a define carried over from desktop GL. BUG=angle:466 Change-Id: I6fc61947b4514654ec21355a786904eac04656c0 Reviewed-on: https://chromium-review.googlesource.com/204936 Tested-by: Jamie Madill <jmadill@chromium.org> Reviewed-by: Zhenyao Mo <zmo@chromium.org> Reviewed-by: Nicolas Capens <nicolascapens@chromium.org>

• 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 <vector>
  #include "angle_gl.h"
  #include <GLSLANG/ShaderLang.h>
  #include <cstddef>
  
  namespace sh
  {
  struct ShaderVariable;
  struct InterfaceBlockField;
  struct BlockMemberInfo;
  struct Uniform;
  struct Varying;
  
  class BlockLayoutEncoder
  {
    public:
      BlockLayoutEncoder(std::vector<BlockMemberInfo> *blockInfoOut);
  
      void encodeInterfaceBlockFields(const std::vector<InterfaceBlockField> &fields);
      void encodeInterfaceBlockField(const InterfaceBlockField &field);
      void encodeType(GLenum type, unsigned int arraySize, bool isRowMajorMatrix);
      size_t getBlockSize() const { return mCurrentOffset * BytesPerComponent; }
  
      static const size_t BytesPerComponent = 4u;
      static const unsigned int ComponentsPerRegister = 4u;
  
    protected:
      size_t mCurrentOffset;
  
      void nextRegister();
  
      virtual void enterAggregateType() = 0;
      virtual void exitAggregateType() = 0;
      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;
  
    private:
      std::vector<BlockMemberInfo> *mBlockInfoOut;
  };
  
  // 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(std::vector<BlockMemberInfo> *blockInfoOut);
  
    protected:
      virtual void enterAggregateType();
      virtual void exitAggregateType();
      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(std::vector<BlockMemberInfo> *blockInfoOut,
                       HLSLBlockEncoderStrategy strategy);
  
      virtual void enterAggregateType();
      virtual void exitAggregateType();
      void skipRegisters(unsigned int numRegisters);
  
      bool isPacked() const { return mEncoderStrategy == ENCODE_PACKED; }
  
    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 assigns values to the variable's "registerIndex" and "elementIndex" fields.
  // "elementIndex" is only used for structures.
  void HLSLVariableGetRegisterInfo(unsigned int baseRegisterIndex, Uniform *variable, ShShaderOutput outputType);
  
  // 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_