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//
// Copyright 2015 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.
//
// VaryingPacking:
// Class which describes a mapping from varyings to registers in D3D
// for linking between shader stages.
//
#ifndef LIBANGLE_RENDERER_D3D_VARYINGPACKING_H_
#define LIBANGLE_RENDERER_D3D_VARYINGPACKING_H_
#include "libANGLE/renderer/d3d/RendererD3D.h"
namespace rx
{
class ProgramD3DMetadata;
struct PackedVarying
{
PackedVarying(const sh::ShaderVariable &varyingIn, sh::InterpolationType interpolationIn)
: varying(&varyingIn), vertexOnly(false), interpolation(interpolationIn)
{
}
PackedVarying(const sh::ShaderVariable &varyingIn,
sh::InterpolationType interpolationIn,
const std::string &parentStructNameIn)
: varying(&varyingIn),
vertexOnly(false),
interpolation(interpolationIn),
parentStructName(parentStructNameIn)
{
}
bool isStructField() const { return !parentStructName.empty(); }
const sh::ShaderVariable *varying;
// Transform feedback varyings can be only referenced in the VS.
bool vertexOnly;
// Cached so we can store sh::ShaderVariable to point to varying fields.
sh::InterpolationType interpolation;
// Struct name
std::string parentStructName;
};
struct PackedVaryingRegister final
{
PackedVaryingRegister()
: packedVarying(nullptr),
varyingArrayIndex(0),
varyingRowIndex(0),
registerRow(0),
registerColumn(0)
{
}
PackedVaryingRegister(const PackedVaryingRegister &) = default;
PackedVaryingRegister &operator=(const PackedVaryingRegister &) = default;
bool operator<(const PackedVaryingRegister &other) const
{
return sortOrder() < other.sortOrder();
}
unsigned int sortOrder() const
{
// TODO(jmadill): Handle interpolation types
return registerRow * 4 + registerColumn;
}
bool isStructField() const { return !structFieldName.empty(); }
// Index to the array of varyings.
const PackedVarying *packedVarying;
// The array element of the packed varying.
unsigned int varyingArrayIndex;
// The row of the array element of the packed varying.
unsigned int varyingRowIndex;
// The register row to which we've assigned this packed varying.
unsigned int registerRow;
// The column of the register row into which we've packed this varying.
unsigned int registerColumn;
// Assigned after packing
unsigned int semanticIndex;
// Struct member this varying corresponds to.
std::string structFieldName;
};
class VaryingPacking final : angle::NonCopyable
{
public:
VaryingPacking(GLuint maxVaryingVectors);
bool packVaryings(gl::InfoLog &infoLog,
const std::vector<PackedVarying> &packedVaryings,
const std::vector<std::string> &transformFeedbackVaryings);
struct Register
{
Register() { data[0] = data[1] = data[2] = data[3] = false; }
bool &operator[](unsigned int index) { return data[index]; }
bool operator[](unsigned int index) const { return data[index]; }
bool data[4];
};
Register &operator[](unsigned int index) { return mRegisterMap[index]; }
const Register &operator[](unsigned int index) const { return mRegisterMap[index]; }
const std::vector<PackedVaryingRegister> &getRegisterList() const { return mRegisterList; }
unsigned int getMaxSemanticIndex() const
{
return static_cast<unsigned int>(mRegisterList.size());
}
unsigned int getRegisterCount() const;
void enableBuiltins(ShaderType shaderType, const ProgramD3DMetadata &programMetadata);
struct BuiltinVarying final : angle::NonCopyable
{
BuiltinVarying();
std::string str() const;
void enableSystem(const std::string &systemValueSemantic);
void enable(const std::string &semanticVal, unsigned int indexVal);
bool enabled;
std::string semantic;
unsigned int index;
bool systemValue;
};
struct BuiltinInfo
{
BuiltinVarying dxPosition;
BuiltinVarying glPosition;
BuiltinVarying glFragCoord;
BuiltinVarying glPointCoord;
BuiltinVarying glPointSize;
};
const BuiltinInfo &builtins(ShaderType shaderType) const { return mBuiltinInfo[shaderType]; }
bool usesPointSize() const { return mBuiltinInfo[SHADER_VERTEX].glPointSize.enabled; }
private:
bool packVarying(const PackedVarying &packedVarying);
bool isFree(unsigned int registerRow,
unsigned int registerColumn,
unsigned int varyingRows,
unsigned int varyingColumns) const;
void insert(unsigned int registerRow,
unsigned int registerColumn,
const PackedVarying &packedVarying);
std::vector<Register> mRegisterMap;
std::vector<PackedVaryingRegister> mRegisterList;
std::vector<BuiltinInfo> mBuiltinInfo;
};
} // namespace rx
#endif // LIBANGLE_RENDERER_D3D_VARYINGPACKING_H_
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