diff options
Diffstat (limited to 'src/3rdparty/angle/src/common/blocklayout.h')
-rw-r--r-- | src/3rdparty/angle/src/common/blocklayout.h | 128 |
1 files changed, 128 insertions, 0 deletions
diff --git a/src/3rdparty/angle/src/common/blocklayout.h b/src/3rdparty/angle/src/common/blocklayout.h new file mode 100644 index 0000000000..3a1ab5ccb0 --- /dev/null +++ b/src/3rdparty/angle/src/common/blocklayout.h @@ -0,0 +1,128 @@ +// +// 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 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(); + + void encodeInterfaceBlockFields(const std::vector<InterfaceBlockField> &fields); + BlockMemberInfo encodeInterfaceBlockField(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; + + 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_ |