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Diffstat (limited to 'chromium/third_party/angle/src/common/shadervars.h')
-rw-r--r-- | chromium/third_party/angle/src/common/shadervars.h | 162 |
1 files changed, 162 insertions, 0 deletions
diff --git a/chromium/third_party/angle/src/common/shadervars.h b/chromium/third_party/angle/src/common/shadervars.h new file mode 100644 index 00000000000..99187a0dc19 --- /dev/null +++ b/chromium/third_party/angle/src/common/shadervars.h @@ -0,0 +1,162 @@ +// +// 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. +// +// shadervars.h: +// Types to represent GL variables (varyings, uniforms, etc) +// + +#ifndef COMMON_SHADERVARIABLE_H_ +#define COMMON_SHADERVARIABLE_H_ + +#include <string> +#include <vector> +#include <algorithm> + +#include <GLES3/gl3.h> +#include <GLES2/gl2.h> + +namespace gl +{ + +// Varying interpolation qualifier, see section 4.3.9 of the ESSL 3.00.4 spec +enum InterpolationType +{ + INTERPOLATION_SMOOTH, + INTERPOLATION_CENTROID, + INTERPOLATION_FLAT +}; + +// Uniform block layout qualifier, see section 4.3.8.3 of the ESSL 3.00.4 spec +enum BlockLayoutType +{ + BLOCKLAYOUT_STANDARD, + BLOCKLAYOUT_PACKED, + BLOCKLAYOUT_SHARED +}; + +// Base class for all variables defined in shaders, including Varyings, Uniforms, etc +struct ShaderVariable +{ + GLenum type; + GLenum precision; + std::string name; + unsigned int arraySize; + + ShaderVariable(GLenum typeIn, GLenum precisionIn, const char *nameIn, unsigned int arraySizeIn) + : type(typeIn), + precision(precisionIn), + name(nameIn), + arraySize(arraySizeIn) + {} + + bool isArray() const { return arraySize > 0; } + unsigned int elementCount() const { return std::max(1u, arraySize); } +}; + +// Uniform registers (and element indices) are assigned when outputting shader code +struct Uniform : public ShaderVariable +{ + unsigned int registerIndex; + unsigned int elementIndex; // Offset within a register, for struct members + std::vector<Uniform> fields; + + Uniform(GLenum typeIn, GLenum precisionIn, const char *nameIn, unsigned int arraySizeIn, + unsigned int registerIndexIn, unsigned int elementIndexIn) + : ShaderVariable(typeIn, precisionIn, nameIn, arraySizeIn), + registerIndex(registerIndexIn), + elementIndex(elementIndexIn) + {} + + bool isStruct() const { return !fields.empty(); } +}; + +struct Attribute : public ShaderVariable +{ + int location; + + Attribute() + : ShaderVariable(GL_NONE, GL_NONE, "", 0), + location(-1) + {} + + Attribute(GLenum typeIn, GLenum precisionIn, const char *nameIn, unsigned int arraySizeIn, int locationIn) + : ShaderVariable(typeIn, precisionIn, nameIn, arraySizeIn), + location(locationIn) + {} +}; + +struct InterfaceBlockField : public ShaderVariable +{ + bool isRowMajorMatrix; + std::vector<InterfaceBlockField> fields; + + InterfaceBlockField(GLenum typeIn, GLenum precisionIn, const char *nameIn, unsigned int arraySizeIn, bool isRowMajorMatrix) + : ShaderVariable(typeIn, precisionIn, nameIn, arraySizeIn), + isRowMajorMatrix(isRowMajorMatrix) + {} + + bool isStruct() const { return !fields.empty(); } +}; + +struct Varying : public ShaderVariable +{ + InterpolationType interpolation; + std::vector<Varying> fields; + std::string structName; + + Varying(GLenum typeIn, GLenum precisionIn, const char *nameIn, unsigned int arraySizeIn, InterpolationType interpolationIn) + : ShaderVariable(typeIn, precisionIn, nameIn, arraySizeIn), + interpolation(interpolationIn) + {} + + bool isStruct() const { return !fields.empty(); } +}; + +struct BlockMemberInfo +{ + int offset; + int arrayStride; + int matrixStride; + bool isRowMajorMatrix; + + static BlockMemberInfo getDefaultBlockInfo() + { + return BlockMemberInfo(-1, -1, -1, false); + } + + BlockMemberInfo(int offset, int arrayStride, int matrixStride, bool isRowMajorMatrix) + : offset(offset), + arrayStride(arrayStride), + matrixStride(matrixStride), + isRowMajorMatrix(isRowMajorMatrix) + {} +}; + +typedef std::vector<BlockMemberInfo> BlockMemberInfoArray; + +struct InterfaceBlock +{ + std::string name; + unsigned int arraySize; + size_t dataSize; + BlockLayoutType layout; + bool isRowMajorLayout; + std::vector<InterfaceBlockField> fields; + std::vector<BlockMemberInfo> blockInfo; + + unsigned int registerIndex; + + InterfaceBlock(const char *name, unsigned int arraySize, unsigned int registerIndex) + : name(name), + arraySize(arraySize), + layout(BLOCKLAYOUT_SHARED), + registerIndex(registerIndex), + isRowMajorLayout(false) + {} +}; + +} + +#endif // COMMON_SHADERVARIABLE_H_ |