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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 <cstddef>
#include <map>
#include <vector>
#include "angle_gl.h"
#include <GLSLANG/ShaderLang.h>
namespace sh
{
struct ShaderVariable;
struct InterfaceBlockField;
struct Uniform;
struct Varying;
struct InterfaceBlock;
struct BlockMemberInfo
{
BlockMemberInfo()
: offset(-1),
arrayStride(-1),
matrixStride(-1),
isRowMajorMatrix(false),
topLevelArrayStride(-1)
{
}
BlockMemberInfo(int offset, int arrayStride, int matrixStride, bool isRowMajorMatrix)
: offset(offset),
arrayStride(arrayStride),
matrixStride(matrixStride),
isRowMajorMatrix(isRowMajorMatrix),
topLevelArrayStride(-1)
{
}
BlockMemberInfo(int offset,
int arrayStride,
int matrixStride,
bool isRowMajorMatrix,
int topLevelArrayStride)
: offset(offset),
arrayStride(arrayStride),
matrixStride(matrixStride),
isRowMajorMatrix(isRowMajorMatrix),
topLevelArrayStride(topLevelArrayStride)
{
}
static BlockMemberInfo getDefaultBlockInfo() { return BlockMemberInfo(-1, -1, -1, false, -1); }
int offset;
int arrayStride;
int matrixStride;
bool isRowMajorMatrix;
int topLevelArrayStride; // Only used for shader storage block members.
};
class BlockLayoutEncoder
{
public:
BlockLayoutEncoder();
virtual ~BlockLayoutEncoder() {}
BlockMemberInfo encodeType(GLenum type,
const std::vector<unsigned int> &arraySizes,
bool isRowMajorMatrix);
size_t getBlockSize() const { return mCurrentOffset * BytesPerComponent; }
virtual void enterAggregateType() = 0;
virtual void exitAggregateType() = 0;
static const size_t BytesPerComponent = 4u;
static const unsigned int ComponentsPerRegister = 4u;
static size_t getBlockRegister(const BlockMemberInfo &info);
static size_t getBlockRegisterElement(const BlockMemberInfo &info);
protected:
size_t mCurrentOffset;
void nextRegister();
virtual void getBlockLayoutInfo(GLenum type,
const std::vector<unsigned int> &arraySizes,
bool isRowMajorMatrix,
int *arrayStrideOut,
int *matrixStrideOut) = 0;
virtual void advanceOffset(GLenum type,
const std::vector<unsigned int> &arraySizes,
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();
void enterAggregateType() override;
void exitAggregateType() override;
protected:
void getBlockLayoutInfo(GLenum type,
const std::vector<unsigned int> &arraySizes,
bool isRowMajorMatrix,
int *arrayStrideOut,
int *matrixStrideOut) override;
void advanceOffset(GLenum type,
const std::vector<unsigned int> &arraySizes,
bool isRowMajorMatrix,
int arrayStride,
int matrixStride) override;
};
using BlockLayoutMap = std::map<std::string, BlockMemberInfo>;
// Only valid to call with ShaderVariable, InterfaceBlockField and Uniform.
template <typename VarT>
void GetUniformBlockInfo(const std::vector<VarT> &fields,
const std::string &prefix,
sh::BlockLayoutEncoder *encoder,
bool inRowMajorLayout,
BlockLayoutMap *blockLayoutMap);
} // namespace sh
#endif // COMMON_BLOCKLAYOUT_H_
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