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//
// 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_
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