chromium/third_party/angle/src/libANGLE/VaryingPacking.cpp

//
// 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, according
//   to the spec, or using custom packing algorithms. We also keep a register
//   allocation list for the D3D renderer.
//

#include "libANGLE/VaryingPacking.h"

#include "common/CompiledShaderState.h"
#include "common/utilities.h"
#include "libANGLE/Program.h"
#include "libANGLE/ProgramExecutable.h"
#include "libANGLE/Shader.h"

namespace gl
{

namespace
{
// true if varying x has a higher priority in packing than y
bool ComparePackedVarying(const PackedVarying &x, const PackedVarying &y)
{ … }

bool InterfaceVariablesMatch(const sh::ShaderVariable &front, const sh::ShaderVariable &back)
{ … }

GLint GetMaxShaderInputVectors(const Caps &caps, ShaderType shaderStage)
{ … }

GLint GetMaxShaderOutputVectors(const Caps &caps, ShaderType shaderStage)
{ … }

bool ShouldSkipPackedVarying(const sh::ShaderVariable &varying, PackMode packMode)
{ … }

std::vector<unsigned int> StripVaryingArrayDimension(const sh::ShaderVariable *frontVarying,
                                                     ShaderType frontShaderStage,
                                                     const sh::ShaderVariable *backVarying,
                                                     ShaderType backShaderStage,
                                                     bool isStructField)
{ … }

PerVertexMember GetPerVertexMember(const std::string &name)
{ … }

void SetActivePerVertexMembers(const sh::ShaderVariable *var, PerVertexMemberBitSet *bitset)
{ … }
}  // anonymous namespace

// Implementation of VaryingInShaderRef
VaryingInShaderRef::VaryingInShaderRef(ShaderType stageIn, const sh::ShaderVariable *varyingIn)
    : … { … }

VaryingInShaderRef::~VaryingInShaderRef() = default;

VaryingInShaderRef::VaryingInShaderRef(VaryingInShaderRef &&other)
    : … { … }

VaryingInShaderRef &VaryingInShaderRef::operator=(VaryingInShaderRef &&other)
{ … }

// Implementation of PackedVarying
PackedVarying::PackedVarying(VaryingInShaderRef &&frontVaryingIn,
                             VaryingInShaderRef &&backVaryingIn,
                             sh::InterpolationType interpolationIn)
    : … { … }

PackedVarying::PackedVarying(VaryingInShaderRef &&frontVaryingIn,
                             VaryingInShaderRef &&backVaryingIn,
                             sh::InterpolationType interpolationIn,
                             GLuint arrayIndexIn,
                             GLuint fieldIndexIn,
                             GLuint secondaryFieldIndexIn)
    : … { … }

PackedVarying::~PackedVarying() = default;

PackedVarying::PackedVarying(PackedVarying &&other)
    : … { … }

PackedVarying &PackedVarying::operator=(PackedVarying &&other)
{ … }

unsigned int PackedVarying::getBasicTypeElementCount() const
{ … }

// Implementation of VaryingPacking
VaryingPacking::VaryingPacking() = default;

VaryingPacking::~VaryingPacking() = default;

void VaryingPacking::reset()
{ … }

void VaryingPacking::clearRegisterMap()
{ … }

// Packs varyings into generic varying registers, using the algorithm from
// See [OpenGL ES Shading Language 1.00 rev. 17] appendix A section 7 page 111
// Also [OpenGL ES Shading Language 3.00 rev. 4] Section 11 page 119
// Returns false if unsuccessful.
bool VaryingPacking::packVaryingIntoRegisterMap(PackMode packMode,
                                                const PackedVarying &packedVarying)
{ … }

bool VaryingPacking::isRegisterRangeFree(unsigned int registerRow,
                                         unsigned int registerColumn,
                                         unsigned int varyingRows,
                                         unsigned int varyingColumns) const
{ … }

void VaryingPacking::insertVaryingIntoRegisterMap(unsigned int registerRow,
                                                  unsigned int registerColumn,
                                                  unsigned int varyingColumns,
                                                  const PackedVarying &packedVarying)
{ … }

void VaryingPacking::collectUserVarying(const ProgramVaryingRef &ref,
                                        VaryingUniqueFullNames *uniqueFullNames)
{ … }

void VaryingPacking::collectUserVaryingField(const ProgramVaryingRef &ref,
                                             GLuint arrayIndex,
                                             GLuint fieldIndex,
                                             GLuint secondaryFieldIndex,
                                             VaryingUniqueFullNames *uniqueFullNames)
{ … }

void VaryingPacking::collectUserVaryingTF(const ProgramVaryingRef &ref, size_t subscript)
{ … }

void VaryingPacking::collectUserVaryingFieldTF(const ProgramVaryingRef &ref,
                                               const sh::ShaderVariable &field,
                                               GLuint fieldIndex,
                                               GLuint secondaryFieldIndex)
{ … }

void VaryingPacking::collectVarying(const sh::ShaderVariable &varying,
                                    const ProgramVaryingRef &ref,
                                    PackMode packMode,
                                    VaryingUniqueFullNames *uniqueFullNames)
{ … }

void VaryingPacking::collectTFVarying(const std::string &tfVarying,
                                      const ProgramVaryingRef &ref,
                                      VaryingUniqueFullNames *uniqueFullNames)
{ … }

bool VaryingPacking::collectAndPackUserVaryings(gl::InfoLog &infoLog,
                                                GLint maxVaryingVectors,
                                                PackMode packMode,
                                                ShaderType frontShaderStage,
                                                ShaderType backShaderStage,
                                                const ProgramMergedVaryings &mergedVaryings,
                                                const std::vector<std::string> &tfVaryings,
                                                const bool isSeparableProgram)
{ … }

// See comment on packVarying.
bool VaryingPacking::packUserVaryings(gl::InfoLog &infoLog,
                                      GLint maxVaryingVectors,
                                      PackMode packMode,
                                      const std::vector<PackedVarying> &packedVaryings)
{ … }

// ProgramVaryingPacking implementation.
ProgramVaryingPacking::ProgramVaryingPacking() = default;

ProgramVaryingPacking::~ProgramVaryingPacking() = default;

const VaryingPacking &ProgramVaryingPacking::getInputPacking(ShaderType backShaderStage) const
{ … }

const VaryingPacking &ProgramVaryingPacking::getOutputPacking(ShaderType frontShaderStage) const
{ … }

bool ProgramVaryingPacking::collectAndPackUserVaryings(InfoLog &infoLog,
                                                       const Caps &caps,
                                                       PackMode packMode,
                                                       const ShaderBitSet &activeShadersMask,
                                                       const ProgramMergedVaryings &mergedVaryings,
                                                       const std::vector<std::string> &tfVaryings,
                                                       bool isSeparableProgram)
{ … }

ProgramMergedVaryings GetMergedVaryingsFromLinkingVariables(
    const LinkingVariables &linkingVariables)
{ … }
}  // namespace gl