| // |
| // 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 <GLES3/gl3.h> |
| #include <GLES2/gl2.h> |
| #include <GLSLANG/ShaderLang.h> |
| #include <cstddef> |
| |
| namespace gl |
| { |
| |
| 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 constnat 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_ |