blocklayoutHLSL.h (2399B)
1 // 2 // Copyright 2013 The ANGLE Project Authors. All rights reserved. 3 // Use of this source code is governed by a BSD-style license that can be 4 // found in the LICENSE file. 5 // 6 // blocklayout.h: 7 // Methods and classes related to uniform layout and packing in GLSL and HLSL. 8 // 9 10 #ifndef COMMON_BLOCKLAYOUTHLSL_H_ 11 #define COMMON_BLOCKLAYOUTHLSL_H_ 12 13 #include <cstddef> 14 #include <vector> 15 16 #include <GLSLANG/ShaderLang.h> 17 #include "angle_gl.h" 18 #include "blocklayout.h" 19 20 namespace sh 21 { 22 // Block layout packed according to the D3D9 or default D3D10+ register packing rules 23 // See http://msdn.microsoft.com/en-us/library/windows/desktop/bb509632(v=vs.85).aspx 24 // The strategy should be ENCODE_LOOSE for D3D9 constant blocks, and ENCODE_PACKED 25 // for everything else (D3D10+ constant blocks and all attributes/varyings). 26 27 class HLSLBlockEncoder : public BlockLayoutEncoder 28 { 29 public: 30 enum HLSLBlockEncoderStrategy 31 { 32 ENCODE_PACKED, 33 ENCODE_LOOSE 34 }; 35 36 HLSLBlockEncoder(HLSLBlockEncoderStrategy strategy, bool transposeMatrices); 37 38 void enterAggregateType(const ShaderVariable &structVar) override; 39 void exitAggregateType(const ShaderVariable &structVar) override; 40 void skipRegisters(unsigned int numRegisters); 41 42 bool isPacked() const { return mEncoderStrategy == ENCODE_PACKED; } 43 44 static HLSLBlockEncoderStrategy GetStrategyFor(ShShaderOutput outputType); 45 46 protected: 47 void getBlockLayoutInfo(GLenum type, 48 const std::vector<unsigned int> &arraySizes, 49 bool isRowMajorMatrix, 50 int *arrayStrideOut, 51 int *matrixStrideOut) override; 52 void advanceOffset(GLenum type, 53 const std::vector<unsigned int> &arraySizes, 54 bool isRowMajorMatrix, 55 int arrayStride, 56 int matrixStride) override; 57 58 HLSLBlockEncoderStrategy mEncoderStrategy; 59 bool mTransposeMatrices; 60 }; 61 62 // This method returns the number of used registers for a ShaderVariable. It is dependent on the 63 // HLSLBlockEncoder class to count the number of used registers in a struct (which are individually 64 // packed according to the same rules). 65 unsigned int HLSLVariableRegisterCount(const ShaderVariable &variable, ShShaderOutput outputType); 66 } // namespace sh 67 68 #endif // COMMON_BLOCKLAYOUTHLSL_H_