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webkit / WebKit / ab348309603e3a9f6609bba404bf498898bf1260 / . / Source / ThirdParty / ANGLE / src / libANGLE / renderer / glslang_wrapper_utils.cpp
blob: 7a0d407d2892721623f11a578d949e513d3d8f01 [file] [log] [blame]
//
// Copyright 2019 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.
//
// Wrapper for Khronos glslang compiler.
//
#include "libANGLE/renderer/glslang_wrapper_utils.h"
// glslang has issues with some specific warnings.
ANGLE_DISABLE_EXTRA_SEMI_WARNING
ANGLE_DISABLE_SHADOWING_WARNING
// glslang's version of ShaderLang.h, not to be confused with ANGLE's.
#include <glslang/Public/ShaderLang.h>
// Other glslang includes.
#include <SPIRV/GlslangToSpv.h>
#include <StandAlone/ResourceLimits.h>
ANGLE_REENABLE_SHADOWING_WARNING
ANGLE_REENABLE_EXTRA_SEMI_WARNING
// SPIR-V headers include for AST transformation.
#include <spirv/unified1/spirv.hpp>
// SPIR-V tools include for AST validation.
#include <spirv-tools/libspirv.hpp>
#include <array>
#include <numeric>
#include "common/FixedVector.h"
#include "common/string_utils.h"
#include "common/utilities.h"
#include "libANGLE/Caps.h"
#include "libANGLE/ProgramLinkedResources.h"
#define ANGLE_GLSLANG_CHECK(CALLBACK, TEST, ERR) \
do \
{ \
if (ANGLE_UNLIKELY(!(TEST))) \
{ \
return CALLBACK(ERR); \
} \
\
} while (0)
namespace rx
{
namespace
{
constexpr char kXfbDeclMarker[] = "@@ XFB-DECL @@";
constexpr char kXfbOutMarker[] = "@@ XFB-OUT @@;";
constexpr char kXfbBuiltInPrefix[] = "xfbANGLE";
constexpr gl::ShaderMap<const char *> kDefaultUniformNames = {
{gl::ShaderType::Vertex, sh::vk::kDefaultUniformsNameVS},
{gl::ShaderType::Geometry, sh::vk::kDefaultUniformsNameGS},
{gl::ShaderType::Fragment, sh::vk::kDefaultUniformsNameFS},
{gl::ShaderType::Compute, sh::vk::kDefaultUniformsNameCS},
};
template <size_t N>
constexpr size_t ConstStrLen(const char (&)[N])
{
static_assert(N > 0, "C++ shouldn't allow N to be zero");
// The length of a string defined as a char array is the size of the array minus 1 (the
// terminating '\0').
return N - 1;
}
void GetBuiltInResourcesFromCaps(const gl::Caps &caps, TBuiltInResource *outBuiltInResources)
{
outBuiltInResources->maxDrawBuffers = caps.maxDrawBuffers;
outBuiltInResources->maxAtomicCounterBindings = caps.maxAtomicCounterBufferBindings;
outBuiltInResources->maxAtomicCounterBufferSize = caps.maxAtomicCounterBufferSize;
outBuiltInResources->maxClipPlanes = caps.maxClipPlanes;
outBuiltInResources->maxCombinedAtomicCounterBuffers = caps.maxCombinedAtomicCounterBuffers;
outBuiltInResources->maxCombinedAtomicCounters = caps.maxCombinedAtomicCounters;
outBuiltInResources->maxCombinedImageUniforms = caps.maxCombinedImageUniforms;
outBuiltInResources->maxCombinedTextureImageUnits = caps.maxCombinedTextureImageUnits;
outBuiltInResources->maxCombinedShaderOutputResources = caps.maxCombinedShaderOutputResources;
outBuiltInResources->maxComputeWorkGroupCountX = caps.maxComputeWorkGroupCount[0];
outBuiltInResources->maxComputeWorkGroupCountY = caps.maxComputeWorkGroupCount[1];
outBuiltInResources->maxComputeWorkGroupCountZ = caps.maxComputeWorkGroupCount[2];
outBuiltInResources->maxComputeWorkGroupSizeX = caps.maxComputeWorkGroupSize[0];
outBuiltInResources->maxComputeWorkGroupSizeY = caps.maxComputeWorkGroupSize[1];
outBuiltInResources->maxComputeWorkGroupSizeZ = caps.maxComputeWorkGroupSize[2];
outBuiltInResources->minProgramTexelOffset = caps.minProgramTexelOffset;
outBuiltInResources->maxFragmentUniformVectors = caps.maxFragmentUniformVectors;
outBuiltInResources->maxFragmentInputComponents = caps.maxFragmentInputComponents;
outBuiltInResources->maxGeometryInputComponents = caps.maxGeometryInputComponents;
outBuiltInResources->maxGeometryOutputComponents = caps.maxGeometryOutputComponents;
outBuiltInResources->maxGeometryOutputVertices = caps.maxGeometryOutputVertices;
outBuiltInResources->maxGeometryTotalOutputComponents = caps.maxGeometryTotalOutputComponents;
outBuiltInResources->maxLights = caps.maxLights;
outBuiltInResources->maxProgramTexelOffset = caps.maxProgramTexelOffset;
outBuiltInResources->maxVaryingComponents = caps.maxVaryingComponents;
outBuiltInResources->maxVaryingVectors = caps.maxVaryingVectors;
outBuiltInResources->maxVertexAttribs = caps.maxVertexAttributes;
outBuiltInResources->maxVertexOutputComponents = caps.maxVertexOutputComponents;
outBuiltInResources->maxVertexUniformVectors = caps.maxVertexUniformVectors;
}
// Test if there are non-zero indices in the uniform name, returning false in that case. This
// happens for multi-dimensional arrays, where a uniform is created for every possible index of the
// array (except for the innermost dimension). When assigning decorations (set/binding/etc), only
// the indices corresponding to the first element of the array should be specified. This function
// is used to skip the other indices.
//
// If useOldRewriteStructSamplers, there are multiple samplers extracted out of struct arrays
// though, so the above only applies to the sampler array defined in the struct.
bool UniformNameIsIndexZero(const std::string &name, bool excludeCheckForOwningStructArrays)
{
size_t lastBracketClose = 0;
if (excludeCheckForOwningStructArrays)
{
size_t lastDot = name.find_last_of('.');
if (lastDot != std::string::npos)
{
lastBracketClose = lastDot;
}
}
while (true)
{
size_t openBracket = name.find('[', lastBracketClose);
if (openBracket == std::string::npos)
{
break;
}
size_t closeBracket = name.find(']', openBracket);
// If the index between the brackets is not zero, ignore this uniform.
if (name.substr(openBracket + 1, closeBracket - openBracket - 1) != "0")
{
return false;
}
lastBracketClose = closeBracket;
}
return true;
}
// Strip indices from the name. If there are non-zero indices, return false to indicate that this
// image uniform doesn't require set/binding. That is done on index 0.
bool GetImageNameWithoutIndices(std::string *name)
{
if (name->back() != ']')
{
return true;
}
if (!UniformNameIsIndexZero(*name, false))
{
return false;
}
// Strip all indices
*name = name->substr(0, name->find('['));
return true;
}
bool MappedSamplerNameNeedsUserDefinedPrefix(const std::string &originalName)
{
return originalName.find('.') == std::string::npos;
}
std::string GetMappedSamplerNameOld(const std::string &originalName)
{
std::string samplerName = gl::ParseResourceName(originalName, nullptr);
// Samplers in structs are extracted.
std::replace(samplerName.begin(), samplerName.end(), '.', '_');
// Samplers in arrays of structs are also extracted.
std::replace(samplerName.begin(), samplerName.end(), '[', '_');
samplerName.erase(std::remove(samplerName.begin(), samplerName.end(), ']'), samplerName.end());
if (MappedSamplerNameNeedsUserDefinedPrefix(originalName))
{
samplerName = sh::kUserDefinedNamePrefix + samplerName;
}
return samplerName;
}
template <typename OutputIter, typename ImplicitIter>
uint32_t CountExplicitOutputs(OutputIter outputsBegin,
OutputIter outputsEnd,
ImplicitIter implicitsBegin,
ImplicitIter implicitsEnd)
{
auto reduce = [implicitsBegin, implicitsEnd](uint32_t count, const sh::ShaderVariable &var) {
bool isExplicit = std::find(implicitsBegin, implicitsEnd, var.name) == implicitsEnd;
return count + isExplicit;
};
return std::accumulate(outputsBegin, outputsEnd, 0, reduce);
}
ShaderInterfaceVariableInfo *AddShaderInterfaceVariable(ShaderInterfaceVariableInfoMap *infoMap,
const std::string &varName)
{
ASSERT(infoMap->find(varName) == infoMap->end());
return &(*infoMap)[varName];
}
ShaderInterfaceVariableInfo *GetShaderInterfaceVariable(ShaderInterfaceVariableInfoMap *infoMap,
const std::string &varName)
{
ASSERT(infoMap->find(varName) != infoMap->end());
return &(*infoMap)[varName];
}
ShaderInterfaceVariableInfo *AddResourceInfo(ShaderInterfaceVariableInfoMap *infoMap,
const std::string &varName,
uint32_t descriptorSet,
uint32_t binding)
{
gl::ShaderBitSet allStages;
allStages.set();
ShaderInterfaceVariableInfo *info = AddShaderInterfaceVariable(infoMap, varName);
info->descriptorSet = descriptorSet;
info->binding = binding;
info->activeStages = allStages;
return info;
}
// Add location information for an in/out variable.
ShaderInterfaceVariableInfo *AddLocationInfo(ShaderInterfaceVariableInfoMap *infoMap,
const std::string &varName,
uint32_t location,
uint32_t component,
gl::ShaderBitSet activeStages)
{
// The info map for this name may or may not exist already. This function merges the
// location/component information.
ShaderInterfaceVariableInfo *info = &(*infoMap)[varName];
for (const gl::ShaderType shaderType : activeStages)
{
ASSERT(info->descriptorSet == ShaderInterfaceVariableInfo::kInvalid);
ASSERT(info->binding == ShaderInterfaceVariableInfo::kInvalid);
ASSERT(info->location[shaderType] == ShaderInterfaceVariableInfo::kInvalid);
ASSERT(info->component[shaderType] == ShaderInterfaceVariableInfo::kInvalid);
info->location[shaderType] = location;
info->component[shaderType] = component;
}
info->activeStages |= activeStages;
return info;
}
// Modify an existing out variable and add transform feedback information.
ShaderInterfaceVariableInfo *SetXfbInfo(ShaderInterfaceVariableInfoMap *infoMap,
const std::string &varName,
uint32_t xfbBuffer,
uint32_t xfbOffset,
uint32_t xfbStride)
{
ShaderInterfaceVariableInfo *info = GetShaderInterfaceVariable(infoMap, varName);
ASSERT(info->xfbBuffer == ShaderInterfaceVariableInfo::kInvalid);
ASSERT(info->xfbOffset == ShaderInterfaceVariableInfo::kInvalid);
ASSERT(info->xfbStride == ShaderInterfaceVariableInfo::kInvalid);
info->xfbBuffer = xfbBuffer;
info->xfbOffset = xfbOffset;
info->xfbStride = xfbStride;
return info;
}
std::string SubstituteTransformFeedbackMarkers(const std::string &originalSource,
const std::string &xfbDecl,
const std::string &xfbOut)
{
const size_t xfbDeclMarkerStart = originalSource.find(kXfbDeclMarker);
const size_t xfbDeclMarkerEnd = xfbDeclMarkerStart + ConstStrLen(kXfbDeclMarker);
const size_t xfbOutMarkerStart = originalSource.find(kXfbOutMarker, xfbDeclMarkerStart);
const size_t xfbOutMarkerEnd = xfbOutMarkerStart + ConstStrLen(kXfbOutMarker);
// The shader is the following form:
//
// ..part1..
// @@ XFB-DECL @@
// ..part2..
// @@ XFB-OUT @@;
// ..part3..
//
// Construct the string by concatenating these five pieces, replacing the markers with the given
// values.
std::string result;
result.append(&originalSource[0], &originalSource[xfbDeclMarkerStart]);
result.append(xfbDecl);
result.append(&originalSource[xfbDeclMarkerEnd], &originalSource[xfbOutMarkerStart]);
result.append(xfbOut);
result.append(&originalSource[xfbOutMarkerEnd], &originalSource[originalSource.size()]);
return result;
}
std::string GenerateTransformFeedbackVaryingOutput(const gl::TransformFeedbackVarying &varying,
const gl::UniformTypeInfo &info,
size_t strideBytes,
size_t offset,
const std::string &bufferIndex)
{
std::ostringstream result;
ASSERT(strideBytes % 4 == 0);
size_t stride = strideBytes / 4;
const size_t arrayIndexStart = varying.arrayIndex == GL_INVALID_INDEX ? 0 : varying.arrayIndex;
const size_t arrayIndexEnd = arrayIndexStart + varying.size();
for (size_t arrayIndex = arrayIndexStart; arrayIndex < arrayIndexEnd; ++arrayIndex)
{
for (int col = 0; col < info.columnCount; ++col)
{
for (int row = 0; row < info.rowCount; ++row)
{
result << "xfbOut" << bufferIndex << "[" << sh::vk::kDriverUniformsVarName
<< ".xfbBufferOffsets[" << bufferIndex
<< "] + (gl_VertexIndex + gl_InstanceIndex * "
<< sh::vk::kDriverUniformsVarName << ".xfbVerticesPerDraw) * " << stride
<< " + " << offset << "] = " << info.glslAsFloat << "("
<< varying.mappedName;
if (varying.isArray())
{
result << "[" << arrayIndex << "]";
}
if (info.columnCount > 1)
{
result << "[" << col << "]";
}
if (info.rowCount > 1)
{
result << "[" << row << "]";
}
result << ");\n";
++offset;
}
}
}
return result.str();
}
void GenerateTransformFeedbackEmulationOutputs(const GlslangSourceOptions &options,
const gl::ProgramState &programState,
std::string *vertexShader,
ShaderInterfaceVariableInfoMap *variableInfoMapOut)
{
const std::vector<gl::TransformFeedbackVarying> &varyings =
programState.getLinkedTransformFeedbackVaryings();
const std::vector<GLsizei> &bufferStrides = programState.getTransformFeedbackStrides();
const bool isInterleaved =
programState.getTransformFeedbackBufferMode() == GL_INTERLEAVED_ATTRIBS;
const size_t bufferCount = isInterleaved ? 1 : varyings.size();
const std::string xfbSet = Str(options.uniformsAndXfbDescriptorSetIndex);
std::vector<std::string> xfbIndices(bufferCount);
std::string xfbDecl;
for (uint32_t bufferIndex = 0; bufferIndex < bufferCount; ++bufferIndex)
{
const std::string xfbBinding = Str(options.xfbBindingIndexStart + bufferIndex);
xfbIndices[bufferIndex] = Str(bufferIndex);
std::string bufferName = "xfbBuffer" + xfbIndices[bufferIndex];
xfbDecl += "layout(set = " + xfbSet + ", binding = " + xfbBinding + ") buffer " +
bufferName + " { float xfbOut" + xfbIndices[bufferIndex] + "[]; };\n";
// Add this entry to the info map, so we can easily assert that every resource has an entry
// in this map.
AddResourceInfo(variableInfoMapOut, bufferName, options.uniformsAndXfbDescriptorSetIndex,
options.xfbBindingIndexStart + bufferIndex);
}
std::string xfbOut =
"if (" + std::string(sh::vk::kDriverUniformsVarName) + ".xfbActiveUnpaused != 0)\n{\n";
size_t outputOffset = 0;
for (size_t varyingIndex = 0; varyingIndex < varyings.size(); ++varyingIndex)
{
const size_t bufferIndex = isInterleaved ? 0 : varyingIndex;
const gl::TransformFeedbackVarying &varying = varyings[varyingIndex];
// For every varying, output to the respective buffer packed. If interleaved, the output is
// always to the same buffer, but at different offsets.
const gl::UniformTypeInfo &info = gl::GetUniformTypeInfo(varying.type);
xfbOut += GenerateTransformFeedbackVaryingOutput(varying, info, bufferStrides[bufferIndex],
outputOffset, xfbIndices[bufferIndex]);
if (isInterleaved)
{
outputOffset += info.columnCount * info.rowCount * varying.size();
}
}
xfbOut += "}\n";
*vertexShader = SubstituteTransformFeedbackMarkers(*vertexShader, xfbDecl, xfbOut);
}
bool IsFirstRegisterOfVarying(const gl::PackedVaryingRegister &varyingReg)
{
const gl::PackedVarying &varying = *varyingReg.packedVarying;
// In Vulkan GLSL, struct fields are not allowed to have location assignments. The varying of a
// struct type is thus given a location equal to the one assigned to its first field.
if (varying.isStructField() && varying.fieldIndex > 0)
{
return false;
}
// Similarly, assign array varying locations to the assigned location of the first element.
if (varyingReg.varyingArrayIndex != 0 || (varying.isArrayElement() && varying.arrayIndex != 0))
{
return false;
}
// Similarly, assign matrix varying locations to the assigned location of the first row.
if (varyingReg.varyingRowIndex != 0)
{
return false;
}
return true;
}
// Calculates XFB layout qualifier arguments for each tranform feedback varying. Stores calculated
// values for the SPIR-V transformation.
void GenerateTransformFeedbackExtensionOutputs(const gl::ProgramState &programState,
const gl::ProgramLinkedResources &resources,
std::string *vertexShader,
ShaderInterfaceVariableInfoMap *variableInfoMapOut,
uint32_t *locationsUsedForXfbExtensionOut)
{
const std::vector<gl::TransformFeedbackVarying> &tfVaryings =
programState.getLinkedTransformFeedbackVaryings();
std::string xfbDecl;
std::string xfbOut;
for (uint32_t varyingIndex = 0; varyingIndex < tfVaryings.size(); ++varyingIndex)
{
const gl::TransformFeedbackVarying &tfVarying = tfVaryings[varyingIndex];
const std::string &tfVaryingName = tfVarying.mappedName;
if (tfVarying.isBuiltIn())
{
// For simplicity, create a copy of every builtin that's captured so xfb qualifiers
// could be added to that instead. This allows the SPIR-V transformation to ignore
// OpMemberName and OpMemberDecorate instructions. Note that capturing gl_Position
// already requires such a copy, since the translator modifies this value at the end of
// main. Capturing the rest of the built-ins are niche enough that the inefficiency
// involved in doing this is not a concern.
uint32_t xfbVaryingLocation = resources.varyingPacking.getMaxSemanticIndex() +
++(*locationsUsedForXfbExtensionOut);
std::string xfbVaryingName = kXfbBuiltInPrefix + tfVaryingName;
// Add declaration and initialization code for the new varying.
std::string varyingType = gl::GetGLSLTypeString(tfVarying.type);
xfbDecl += "layout(location = " + Str(xfbVaryingLocation) + ") out " + varyingType +
" " + xfbVaryingName + ";\n";
xfbOut += xfbVaryingName + " = " + tfVaryingName + ";\n";
}
}
*vertexShader = SubstituteTransformFeedbackMarkers(*vertexShader, xfbDecl, xfbOut);
}
void AssignAttributeLocations(const gl::ProgramState &programState,
ShaderInterfaceVariableInfoMap *variableInfoMapOut)
{
gl::ShaderBitSet vertexOnly;
vertexOnly.set(gl::ShaderType::Vertex);
// Assign attribute locations for the vertex shader.
for (const sh::ShaderVariable &attribute : programState.getProgramInputs())
{
ASSERT(attribute.active);
AddLocationInfo(variableInfoMapOut, attribute.mappedName, attribute.location,
ShaderInterfaceVariableInfo::kInvalid, vertexOnly);
}
}
void AssignOutputLocations(const gl::ProgramState &programState,
ShaderInterfaceVariableInfoMap *variableInfoMapOut)
{
// Assign output locations for the fragment shader.
// TODO(syoussefi): Add support for EXT_blend_func_extended. http://anglebug.com/3385
const auto &outputLocations = programState.getOutputLocations();
const auto &outputVariables = programState.getOutputVariables();
const std::array<std::string, 3> implicitOutputs = {"gl_FragDepth", "gl_SampleMask",
"gl_FragStencilRefARB"};
gl::ShaderBitSet fragmentOnly;
fragmentOnly.set(gl::ShaderType::Fragment);
for (const gl::VariableLocation &outputLocation : outputLocations)
{
if (outputLocation.arrayIndex == 0 && outputLocation.used() && !outputLocation.ignored)
{
const sh::ShaderVariable &outputVar = outputVariables[outputLocation.index];
uint32_t location = 0;
if (outputVar.location != -1)
{
location = outputVar.location;
}
else if (std::find(implicitOutputs.begin(), implicitOutputs.end(), outputVar.name) ==
implicitOutputs.end())
{
// If there is only one output, it is allowed not to have a location qualifier, in
// which case it defaults to 0. GLSL ES 3.00 spec, section 4.3.8.2.
ASSERT(CountExplicitOutputs(outputVariables.begin(), outputVariables.end(),
implicitOutputs.begin(), implicitOutputs.end()) == 1);
}
AddLocationInfo(variableInfoMapOut, outputVar.mappedName, location,
ShaderInterfaceVariableInfo::kInvalid, fragmentOnly);
}
}
// When no fragment output is specified by the shader, the translator outputs webgl_FragColor or
// webgl_FragData. Add an entry for these. Even though the translator is already assigning
// location 0 to these entries, adding an entry for them here allows us to ASSERT that every
// shader interface variable is processed during the SPIR-V transformation. This is done when
// iterating the ids provided by OpEntryPoint.
AddLocationInfo(variableInfoMapOut, "webgl_FragColor", 0, 0, fragmentOnly);
AddLocationInfo(variableInfoMapOut, "webgl_FragData", 0, 0, fragmentOnly);
}
void AssignVaryingLocations(const GlslangSourceOptions &options,
const gl::ProgramState &programState,
const gl::ProgramLinkedResources &resources,
uint32_t locationsUsedForXfbExtension,
ShaderInterfaceVariableInfoMap *variableInfoMapOut)
{
uint32_t locationsUsedForEmulation = locationsUsedForXfbExtension;
// Substitute layout and qualifier strings for the position varying added for line raster
// emulation.
if (options.emulateBresenhamLines)
{
uint32_t lineRasterEmulationPositionLocation = locationsUsedForEmulation++;
gl::ShaderBitSet allActiveStages;
allActiveStages.set();
AddLocationInfo(variableInfoMapOut, sh::vk::kLineRasterEmulationPosition,
lineRasterEmulationPositionLocation, ShaderInterfaceVariableInfo::kInvalid,
allActiveStages);
}
// Assign varying locations.
for (const gl::PackedVaryingRegister &varyingReg : resources.varyingPacking.getRegisterList())
{
if (!IsFirstRegisterOfVarying(varyingReg))
{
continue;
}
const gl::PackedVarying &varying = *varyingReg.packedVarying;
// In the following:
//
// struct S { vec4 field; };
// out S varStruct;
//
// "_uvarStruct" is found through |parentStructMappedName|, with |varying->mappedName|
// being "_ufield". In such a case, use |parentStructMappedName|.
const std::string &name =
varying.isStructField() ? varying.parentStructMappedName : varying.varying->mappedName;
uint32_t location = varyingReg.registerRow + locationsUsedForEmulation;
uint32_t component = ShaderInterfaceVariableInfo::kInvalid;
if (varyingReg.registerColumn > 0)
{
ASSERT(!varying.varying->isStruct());
ASSERT(!gl::IsMatrixType(varying.varying->type));
component = varyingReg.registerColumn;
}
AddLocationInfo(variableInfoMapOut, name, location, component, varying.shaderStages);
}
// Add an entry for inactive varyings.
for (const std::string &varyingName : resources.varyingPacking.getInactiveVaryingMappedNames())
{
bool isBuiltin = angle::BeginsWith(varyingName, "gl_");
if (isBuiltin)
{
continue;
}
// TODO(syoussefi): inactive varying names should be unique. However, due to mishandling of
// partially captured arrays, a varying name can end up in both the active and inactive
// lists. The test below should be removed once that issue is resolved.
// http://anglebug.com/4140
if (variableInfoMapOut->find(varyingName) != variableInfoMapOut->end())
{
continue;
}
AddLocationInfo(variableInfoMapOut, varyingName, ShaderInterfaceVariableInfo::kInvalid,
ShaderInterfaceVariableInfo::kInvalid, gl::ShaderBitSet());
}
}
// Calculates XFB layout qualifier arguments for each tranform feedback varying. Stores calculated
// values for the SPIR-V transformation.
void AssignTransformFeedbackExtensionQualifiers(const gl::ProgramState &programState,
const gl::ProgramLinkedResources &resources,
uint32_t locationsUsedForXfbExtension,
ShaderInterfaceVariableInfoMap *variableInfoMapOut)
{
const std::vector<gl::TransformFeedbackVarying> &tfVaryings =
programState.getLinkedTransformFeedbackVaryings();
const std::vector<GLsizei> &varyingStrides = programState.getTransformFeedbackStrides();
const bool isInterleaved =
programState.getTransformFeedbackBufferMode() == GL_INTERLEAVED_ATTRIBS;
std::string xfbDecl;
std::string xfbOut;
uint32_t currentOffset = 0;
uint32_t currentStride = 0;
uint32_t bufferIndex = 0;
uint32_t currentBuiltinLocation = 0;
for (uint32_t varyingIndex = 0; varyingIndex < tfVaryings.size(); ++varyingIndex)
{
if (isInterleaved)
{
bufferIndex = 0;
if (varyingIndex > 0)
{
const gl::TransformFeedbackVarying &prev = tfVaryings[varyingIndex - 1];
currentOffset += prev.size() * gl::VariableExternalSize(prev.type);
}
currentStride = varyingStrides[0];
}
else
{
bufferIndex = varyingIndex;
currentOffset = 0;
currentStride = varyingStrides[varyingIndex];
}
const gl::TransformFeedbackVarying &tfVarying = tfVaryings[varyingIndex];
const std::string &tfVaryingName = tfVarying.mappedName;
if (tfVarying.isBuiltIn())
{
uint32_t xfbVaryingLocation = currentBuiltinLocation++;
std::string xfbVaryingName = kXfbBuiltInPrefix + tfVaryingName;
ASSERT(xfbVaryingLocation < locationsUsedForXfbExtension);
gl::ShaderBitSet vertexOnly;
vertexOnly.set(gl::ShaderType::Vertex);
AddLocationInfo(variableInfoMapOut, xfbVaryingName, xfbVaryingLocation,
ShaderInterfaceVariableInfo::kInvalid, vertexOnly);
SetXfbInfo(variableInfoMapOut, xfbVaryingName, bufferIndex, currentOffset,
currentStride);
}
else if (!tfVarying.isArray() || tfVarying.arrayIndex == 0)
{
// Note: capturing individual array elements using the Vulkan transform feedback
// extension is not supported, and it unlikely to be ever supported (on the contrary, it
// may be removed from the GLES spec). http://anglebug.com/4140
// Find the varying with this name. If a struct is captured, we would be iterating over
// its fields, and the name of the varying is found through parentStructMappedName. Not
// only that, but also we should only do this for the first field of the struct.
const gl::PackedVarying *originalVarying = nullptr;
for (const gl::PackedVaryingRegister &varyingReg :
resources.varyingPacking.getRegisterList())
{
if (!IsFirstRegisterOfVarying(varyingReg))
{
continue;
}
const gl::PackedVarying *varying = varyingReg.packedVarying;
if (varying->varying->name == tfVarying.name)
{
originalVarying = varying;
break;
}
}
if (originalVarying)
{
const std::string &mappedName = originalVarying->isStructField()
? originalVarying->parentStructMappedName
: originalVarying->varying->mappedName;
// Set xfb info for this varying. AssignVaryingLocations should have already added
// location information for these varyings.
SetXfbInfo(variableInfoMapOut, mappedName, bufferIndex, currentOffset,
currentStride);
}
}
}
}
void AssignUniformBindings(const GlslangSourceOptions &options,
gl::ShaderMap<std::string> *shaderSources,
ShaderInterfaceVariableInfoMap *variableInfoMapOut)
{
// Assign binding to the default uniforms block of each shader stage.
uint32_t bindingIndex = 0;
for (const gl::ShaderType shaderType : gl::AllShaderTypes())
{
const std::string &shaderSource = (*shaderSources)[shaderType];
if (!shaderSource.empty())
{
AddResourceInfo(variableInfoMapOut, kDefaultUniformNames[shaderType],
options.uniformsAndXfbDescriptorSetIndex, bindingIndex);
++bindingIndex;
}
}
// Assign binding to the driver uniforms block
AddResourceInfo(variableInfoMapOut, sh::vk::kDriverUniformsVarName,
options.driverUniformsDescriptorSetIndex, 0);
}
uint32_t AssignInterfaceBlockBindings(const GlslangSourceOptions &options,
const std::vector<gl::InterfaceBlock> &blocks,
uint32_t bindingStart,
ShaderInterfaceVariableInfoMap *variableInfoMapOut)
{
uint32_t bindingIndex = bindingStart;
for (const gl::InterfaceBlock &block : blocks)
{
if (!block.isArray || block.arrayElement == 0)
{
AddResourceInfo(variableInfoMapOut, block.mappedName,
options.shaderResourceDescriptorSetIndex, bindingIndex);
++bindingIndex;
}
}
return bindingIndex;
}
uint32_t AssignAtomicCounterBufferBindings(const GlslangSourceOptions &options,
const std::vector<gl::AtomicCounterBuffer> &buffers,
uint32_t bindingStart,
ShaderInterfaceVariableInfoMap *variableInfoMapOut)
{
if (buffers.size() == 0)
{
return bindingStart;
}
AddResourceInfo(variableInfoMapOut, sh::vk::kAtomicCountersVarName,
options.shaderResourceDescriptorSetIndex, bindingStart);
return bindingStart + 1;
}
uint32_t AssignImageBindings(const GlslangSourceOptions &options,
const std::vector<gl::LinkedUniform> &uniforms,
const gl::RangeUI &imageUniformRange,
uint32_t bindingStart,
ShaderInterfaceVariableInfoMap *variableInfoMapOut)
{
uint32_t bindingIndex = bindingStart;
for (unsigned int uniformIndex : imageUniformRange)
{
const gl::LinkedUniform &imageUniform = uniforms[uniformIndex];
std::string name = imageUniform.mappedName;
if (GetImageNameWithoutIndices(&name))
{
AddResourceInfo(variableInfoMapOut, name, options.shaderResourceDescriptorSetIndex,
bindingIndex);
}
++bindingIndex;
}
return bindingIndex;
}
void AssignNonTextureBindings(const GlslangSourceOptions &options,
const gl::ProgramState &programState,
ShaderInterfaceVariableInfoMap *variableInfoMapOut)
{
uint32_t bindingStart = 0;
const std::vector<gl::InterfaceBlock> &uniformBlocks = programState.getUniformBlocks();
bindingStart =
AssignInterfaceBlockBindings(options, uniformBlocks, bindingStart, variableInfoMapOut);
const std::vector<gl::InterfaceBlock> &storageBlocks = programState.getShaderStorageBlocks();
bindingStart =
AssignInterfaceBlockBindings(options, storageBlocks, bindingStart, variableInfoMapOut);
const std::vector<gl::AtomicCounterBuffer> &atomicCounterBuffers =
programState.getAtomicCounterBuffers();
bindingStart = AssignAtomicCounterBufferBindings(options, atomicCounterBuffers, bindingStart,
variableInfoMapOut);
const std::vector<gl::LinkedUniform> &uniforms = programState.getUniforms();
const gl::RangeUI &imageUniformRange = programState.getImageUniformRange();
bindingStart =
AssignImageBindings(options, uniforms, imageUniformRange, bindingStart, variableInfoMapOut);
}
void AssignTextureBindings(const GlslangSourceOptions &options,
const gl::ProgramState &programState,
ShaderInterfaceVariableInfoMap *variableInfoMapOut)
{
// Assign textures to a descriptor set and binding.
uint32_t bindingIndex = 0;
const std::vector<gl::LinkedUniform> &uniforms = programState.getUniforms();
for (unsigned int uniformIndex : programState.getSamplerUniformRange())
{
const gl::LinkedUniform &samplerUniform = uniforms[uniformIndex];
if (!options.useOldRewriteStructSamplers &&
gl::SamplerNameContainsNonZeroArrayElement(samplerUniform.name))
{
continue;
}
if (UniformNameIsIndexZero(samplerUniform.name, options.useOldRewriteStructSamplers))
{
// Samplers in structs are extracted and renamed.
const std::string samplerName = options.useOldRewriteStructSamplers
? GetMappedSamplerNameOld(samplerUniform.name)
: GlslangGetMappedSamplerName(samplerUniform.name);
AddResourceInfo(variableInfoMapOut, samplerName, options.textureDescriptorSetIndex,
bindingIndex);
}
++bindingIndex;
}
}
constexpr gl::ShaderMap<EShLanguage> kShLanguageMap = {
{gl::ShaderType::Vertex, EShLangVertex},
{gl::ShaderType::Geometry, EShLangGeometry},
{gl::ShaderType::Fragment, EShLangFragment},
{gl::ShaderType::Compute, EShLangCompute},
};
angle::Result GetShaderSpirvCode(GlslangErrorCallback callback,
const gl::Caps &glCaps,
const gl::ShaderMap<std::string> &shaderSources,
gl::ShaderMap<std::vector<uint32_t>> *spirvBlobsOut)
{
// Enable SPIR-V and Vulkan rules when parsing GLSL
EShMessages messages = static_cast<EShMessages>(EShMsgSpvRules | EShMsgVulkanRules);
TBuiltInResource builtInResources(glslang::DefaultTBuiltInResource);
GetBuiltInResourcesFromCaps(glCaps, &builtInResources);
glslang::TShader vertexShader(EShLangVertex);
glslang::TShader fragmentShader(EShLangFragment);
glslang::TShader geometryShader(EShLangGeometry);
glslang::TShader computeShader(EShLangCompute);
gl::ShaderMap<glslang::TShader *> shaders = {
{gl::ShaderType::Vertex, &vertexShader},
{gl::ShaderType::Fragment, &fragmentShader},
{gl::ShaderType::Geometry, &geometryShader},
{gl::ShaderType::Compute, &computeShader},
};
glslang::TProgram program;
for (const gl::ShaderType shaderType : gl::AllShaderTypes())
{
if (shaderSources[shaderType].empty())
{
continue;
}
const char *shaderString = shaderSources[shaderType].c_str();
int shaderLength = static_cast<int>(shaderSources[shaderType].size());
glslang::TShader *shader = shaders[shaderType];
shader->setStringsWithLengths(&shaderString, &shaderLength, 1);
shader->setEntryPoint("main");
bool result = shader->parse(&builtInResources, 450, ECoreProfile, false, false, messages);
if (!result)
{
ERR() << "Internal error parsing Vulkan shader corresponding to " << shaderType << ":\n"
<< shader->getInfoLog() << "\n"
<< shader->getInfoDebugLog() << "\n";
ANGLE_GLSLANG_CHECK(callback, false, GlslangError::InvalidShader);
}
program.addShader(shader);
}
bool linkResult = program.link(messages);
if (!linkResult)
{
ERR() << "Internal error linking Vulkan shaders:\n" << program.getInfoLog() << "\n";
ANGLE_GLSLANG_CHECK(callback, false, GlslangError::InvalidShader);
}
for (const gl::ShaderType shaderType : gl::AllShaderTypes())
{
if (shaderSources[shaderType].empty())
{
continue;
}
glslang::TIntermediate *intermediate = program.getIntermediate(kShLanguageMap[shaderType]);
glslang::GlslangToSpv(*intermediate, (*spirvBlobsOut)[shaderType]);
}
return angle::Result::Continue;
}
void ValidateSpirvMessage(spv_message_level_t level,
const char *source,
const spv_position_t &position,
const char *message)
{
WARN() << "Level" << level << ": " << message;
}
bool ValidateSpirv(const std::vector<uint32_t> &spirvBlob)
{
spvtools::SpirvTools spirvTools(SPV_ENV_VULKAN_1_1);
spirvTools.SetMessageConsumer(ValidateSpirvMessage);
bool result = spirvTools.Validate(spirvBlob);
if (!result)
{
std::string readableSpirv;
result = spirvTools.Disassemble(spirvBlob, &readableSpirv,
SPV_BINARY_TO_TEXT_OPTION_FRIENDLY_NAMES);
WARN() << "Invalid SPIR-V:\n" << readableSpirv;
}
return result;
}
// A SPIR-V transformer. It walks the instructions and modifies them as necessary, for example to
// assign bindings or locations.
class SpirvTransformer final : angle::NonCopyable
{
public:
SpirvTransformer(const std::vector<uint32_t> &spirvBlobIn,
const ShaderInterfaceVariableInfoMap &variableInfoMap,
gl::ShaderType shaderType,
SpirvBlob *spirvBlobOut)
: mSpirvBlobIn(spirvBlobIn),
mShaderType(shaderType),
mHasTransformFeedbackOutput(false),
mVariableInfoMap(variableInfoMap),
mSpirvBlobOut(spirvBlobOut)
{
gl::ShaderBitSet allStages;
allStages.set();
mBuiltinVariableInfo.activeStages = allStages;
}
bool transform();
private:
// SPIR-V 1.0 Table 1: First Words of Physical Layout
enum HeaderIndex
{
kHeaderIndexMagic = 0,
kHeaderIndexVersion = 1,
kHeaderIndexGenerator = 2,
kHeaderIndexIndexBound = 3,
kHeaderIndexSchema = 4,
kHeaderIndexInstructions = 5,
};
// A prepass to resolve interesting ids:
void resolveVariableIds();
// Transform instructions:
void transformInstruction();
// Instructions that are purely informational:
void visitName(const uint32_t *instruction);
void visitTypeHelper(const uint32_t *instruction, size_t idIndex, size_t typeIdIndex);
void visitTypeArray(const uint32_t *instruction);
void visitTypePointer(const uint32_t *instruction);
void visitVariable(const uint32_t *instruction);
// Instructions that potentially need transformation. They return true if the instruction is
// transformed. If false is returned, the instruction should be copied as-is.
bool transformAccessChain(const uint32_t *instruction, size_t wordCount);
bool transformCapability(const uint32_t *instruction, size_t wordCount);
bool transformEntryPoint(const uint32_t *instruction, size_t wordCount);
bool transformDecorate(const uint32_t *instruction, size_t wordCount);
bool transformTypePointer(const uint32_t *instruction, size_t wordCount);
bool transformVariable(const uint32_t *instruction, size_t wordCount);
// Any other instructions:
size_t copyInstruction(const uint32_t *instruction, size_t wordCount);
uint32_t getNewId();
// SPIR-V to transform:
const std::vector<uint32_t> &mSpirvBlobIn;
const gl::ShaderType mShaderType;
bool mHasTransformFeedbackOutput;
// Input shader variable info map:
const ShaderInterfaceVariableInfoMap &mVariableInfoMap;
ShaderInterfaceVariableInfo mBuiltinVariableInfo;
// Transformed SPIR-V:
SpirvBlob *mSpirvBlobOut;
// Traversal state:
size_t mCurrentWord = 0;
bool mIsInFunctionSection = false;
// Transformation state:
// Shader variable info per id, if id is a shader variable.
std::vector<const ShaderInterfaceVariableInfo *> mVariableInfoById;
// Each OpTypePointer instruction that defines a type with the Output storage class is
// duplicated with a similar instruction but which defines a type with the Private storage
// class. If inactive varyings are encountered, its type is changed to the Private one. The
// following vector maps the Output type id to the corresponding Private one.
std::vector<uint32_t> mTypePointerTransformedId;
};
bool SpirvTransformer::transform()
{
// Glslang succeeded in outputting SPIR-V, so we assume it's valid.
ASSERT(mSpirvBlobIn.size() >= kHeaderIndexInstructions);
// Since SPIR-V comes from a local call to glslang, it necessarily has the same endianness as
// the running architecture, so no byte-swapping is necessary.
ASSERT(mSpirvBlobIn[kHeaderIndexMagic] == spv::MagicNumber);
// Make sure the transformer is not reused to avoid having to reinitialize it here.
ASSERT(mCurrentWord == 0);
ASSERT(mIsInFunctionSection == false);
// Make sure the SpirvBlob is not reused.
ASSERT(mSpirvBlobOut->empty());
// First, find all necessary ids and associate them with the information required to transform
// their decorations.
resolveVariableIds();
// Copy the header to SpirvBlob
mSpirvBlobOut->assign(mSpirvBlobIn.begin(), mSpirvBlobIn.begin() + kHeaderIndexInstructions);
mCurrentWord = kHeaderIndexInstructions;
while (mCurrentWord < mSpirvBlobIn.size())
{
transformInstruction();
}
return true;
}
// SPIR-V 1.0 Table 2: Instruction Physical Layout
uint32_t GetSpirvInstructionLength(const uint32_t *instruction)
{
return instruction[0] >> 16;
}
uint32_t GetSpirvInstructionOp(const uint32_t *instruction)
{
constexpr uint32_t kOpMask = 0xFFFFu;
return instruction[0] & kOpMask;
}
void SetSpirvInstructionLength(uint32_t *instruction, size_t length)
{
ASSERT(length < 0xFFFFu);
constexpr uint32_t kLengthMask = 0xFFFF0000u;
instruction[0] &= ~kLengthMask;
instruction[0] |= length << 16;
}
void SetSpirvInstructionOp(uint32_t *instruction, uint32_t op)
{
constexpr uint32_t kOpMask = 0xFFFFu;
instruction[0] &= ~kOpMask;
instruction[0] |= op;
}
void SpirvTransformer::resolveVariableIds()
{
size_t indexBound = mSpirvBlobIn[kHeaderIndexIndexBound];
// Allocate storage for id-to-info map. If %i is the id of a name in mVariableInfoMap, index i
// in this vector will hold a pointer to the ShaderInterfaceVariableInfo object associated with
// that name in mVariableInfoMap.
mVariableInfoById.resize(indexBound + 1, nullptr);
// Allocate storage for Output type pointer map. At index i, this vector holds the identical
// type as %i except for its storage class turned to Private.
mTypePointerTransformedId.resize(indexBound + 1, 0);
size_t currentWord = kHeaderIndexInstructions;
while (currentWord < mSpirvBlobIn.size())
{
const uint32_t *instruction = &mSpirvBlobIn[currentWord];
const uint32_t wordCount = GetSpirvInstructionLength(instruction);
const uint32_t opCode = GetSpirvInstructionOp(instruction);
switch (opCode)
{
case spv::OpName:
visitName(instruction);
break;
case spv::OpTypeArray:
visitTypeArray(instruction);
break;
case spv::OpTypePointer:
visitTypePointer(instruction);
break;
case spv::OpVariable:
visitVariable(instruction);
break;
case spv::OpFunction:
// SPIR-V is structured in sections (SPIR-V 1.0 Section 2.4 Logical Layout of a
// Module). Names appear before decorations, which are followed by type+variables
// and finally functions. We are only interested in name and variable declarations
// (as well as type declarations for the sake of nameless interface blocks). Early
// out when the function declaration section is met.
return;
default:
break;
}
currentWord += wordCount;
}
}
void SpirvTransformer::transformInstruction()
{
const uint32_t *instruction = &mSpirvBlobIn[mCurrentWord];
const uint32_t wordCount = GetSpirvInstructionLength(instruction);
const uint32_t opCode = GetSpirvInstructionOp(instruction);
// Since glslang succeeded in producing SPIR-V, we assume it to be valid.
ASSERT(mCurrentWord + wordCount <= mSpirvBlobIn.size());
if (opCode == spv::OpFunction)
{
// SPIR-V is structured in sections. Function declarations come last. Only Op*Access*
// opcodes inside functions need to be inspected.
mIsInFunctionSection = true;
}
// Only look at interesting instructions.
bool transformed = false;
if (mIsInFunctionSection)
{
// Look at in-function opcodes.
switch (opCode)
{
case spv::OpAccessChain:
case spv::OpInBoundsAccessChain:
case spv::OpPtrAccessChain:
case spv::OpInBoundsPtrAccessChain:
transformed = transformAccessChain(instruction, wordCount);
break;
default:
break;
}
}
else
{
// Look at global declaration opcodes.
switch (opCode)
{
case spv::OpCapability:
transformed = transformCapability(instruction, wordCount);
break;
case spv::OpEntryPoint:
transformed = transformEntryPoint(instruction, wordCount);
break;
case spv::OpDecorate:
transformed = transformDecorate(instruction, wordCount);
break;
case spv::OpTypePointer:
transformed = transformTypePointer(instruction, wordCount);
break;
case spv::OpVariable:
transformed = transformVariable(instruction, wordCount);
break;
default:
break;
}
}
// If the instruction was not transformed, copy it to output as is.
if (!transformed)
{
copyInstruction(instruction, wordCount);
}
// Advance to next instruction.
mCurrentWord += wordCount;
}
void SpirvTransformer::visitName(const uint32_t *instruction)
{
// We currently don't have any big-endian devices in the list of supported platforms. Literal
// strings in SPIR-V are stored little-endian (SPIR-V 1.0 Section 2.2.1, Literal String), so if
// a big-endian device is to be supported, the string matching here should be specialized.
ASSERT(IsLittleEndian());
// SPIR-V 1.0 Section 3.32 Instructions, OpName
constexpr size_t kIdIndex = 1;
constexpr size_t kNameIndex = 2;
const uint32_t id = instruction[kIdIndex];
const char *name = reinterpret_cast<const char *>(&instruction[kNameIndex]);
// The names and ids are unique
ASSERT(id < mVariableInfoById.size());
ASSERT(mVariableInfoById[id] == nullptr);
bool isBuiltin = angle::BeginsWith(name, "gl_");
if (isBuiltin)
{
// Make all builtins point to this no-op info. Adding this entry allows us to ASSERT that
// every shader interface variable is processed during the SPIR-V transformation. This is
// done when iterating the ids provided by OpEntryPoint.
mVariableInfoById[id] = &mBuiltinVariableInfo;
return;
}
auto infoIter = mVariableInfoMap.find(name);
if (infoIter == mVariableInfoMap.end())
{
return;
}
const ShaderInterfaceVariableInfo *info = &infoIter->second;
// Associate the id of this name with its info.
mVariableInfoById[id] = info;
// Note if the variable is captured by transform feedback. In that case, the TransformFeedback
// capability needs to be added.
if (mShaderType != gl::ShaderType::Fragment &&
info->xfbBuffer != ShaderInterfaceVariableInfo::kInvalid && info->activeStages[mShaderType])
{
mHasTransformFeedbackOutput = true;
}
}
void SpirvTransformer::visitTypeHelper(const uint32_t *instruction,
const size_t idIndex,
const size_t typeIdIndex)
{
const uint32_t id = instruction[idIndex];
const uint32_t typeId = instruction[typeIdIndex];
// Every type id is declared only once.
ASSERT(typeId < mVariableInfoById.size());
if (mVariableInfoById[typeId] != nullptr)
{
// Carry the info forward from the base type. This is only necessary for interface blocks,
// as the variable info is associated with the block name instead of the variable name (to
// support nameless interface blocks). In that case, the variable itself doesn't yet have
// an associated info.
ASSERT(id < mVariableInfoById.size());
ASSERT(mVariableInfoById[id] == nullptr);
mVariableInfoById[id] = mVariableInfoById[typeId];
}
}
void SpirvTransformer::visitTypeArray(const uint32_t *instruction)
{
// SPIR-V 1.0 Section 3.32 Instructions, OpTypeArray
constexpr size_t kIdIndex = 1;
constexpr size_t kElementTypeIdIndex = 2;
visitTypeHelper(instruction, kIdIndex, kElementTypeIdIndex);
}
void SpirvTransformer::visitTypePointer(const uint32_t *instruction)
{
// SPIR-V 1.0 Section 3.32 Instructions, OpTypePointer
constexpr size_t kIdIndex = 1;
constexpr size_t kTypeIdIndex = 3;
visitTypeHelper(instruction, kIdIndex, kTypeIdIndex);
}
void SpirvTransformer::visitVariable(const uint32_t *instruction)
{
// SPIR-V 1.0 Section 3.32 Instructions, OpVariable
constexpr size_t kTypeIdIndex = 1;
constexpr size_t kIdIndex = 2;
constexpr size_t kStorageClassIndex = 3;
visitTypeHelper(instruction, kIdIndex, kTypeIdIndex);
// All resources that take set/binding should be transformed.
const uint32_t id = instruction[kIdIndex];
const uint32_t storageClass = instruction[kStorageClassIndex];
ASSERT((storageClass != spv::StorageClassUniform && storageClass != spv::StorageClassImage &&
storageClass != spv::StorageClassStorageBuffer) ||
mVariableInfoById[id] != nullptr);
}
bool SpirvTransformer::transformDecorate(const uint32_t *instruction, size_t wordCount)
{
// SPIR-V 1.0 Section 3.32 Instructions, OpDecorate
constexpr size_t kIdIndex = 1;
constexpr size_t kDecorationIndex = 2;
constexpr size_t kDecorationValueIndex = 3;
uint32_t id = instruction[kIdIndex];
uint32_t decoration = instruction[kDecorationIndex];
const ShaderInterfaceVariableInfo *info = mVariableInfoById[id];
// If variable is not a shader interface variable that needs modification, there's nothing to
// do.
if (info == nullptr)
{
return false;
}
// If it's an inactive varying, remove the decoration altogether.
if (!info->activeStages[mShaderType])
{
return true;
}
uint32_t newDecorationValue = ShaderInterfaceVariableInfo::kInvalid;
switch (decoration)
{
case spv::DecorationLocation:
newDecorationValue = info->location[mShaderType];
break;
case spv::DecorationBinding:
newDecorationValue = info->binding;
break;
case spv::DecorationDescriptorSet:
newDecorationValue = info->descriptorSet;
break;
default:
break;
}
// If the decoration is not something we care about modifying, there's nothing to do.
if (newDecorationValue == ShaderInterfaceVariableInfo::kInvalid)
{
return false;
}
// Copy the decoration declaration and modify it.
const size_t instructionOffset = copyInstruction(instruction, wordCount);
(*mSpirvBlobOut)[instructionOffset + kDecorationValueIndex] = newDecorationValue;
// If there are decorations to be added, add them right after the Location decoration is
// encountered.
if (decoration != spv::DecorationLocation)
{
return true;
}
// Add component decoration, if any.
if (info->component[mShaderType] != ShaderInterfaceVariableInfo::kInvalid)
{
// Copy the location decoration declaration and modify it to contain the Component
// decoration.
const size_t instOffset = copyInstruction(instruction, wordCount);
(*mSpirvBlobOut)[instOffset + kDecorationIndex] = spv::DecorationComponent;
(*mSpirvBlobOut)[instOffset + kDecorationValueIndex] = info->component[mShaderType];
}
// Add Xfb decorations, if any.
if (mShaderType != gl::ShaderType::Fragment &&
info->xfbBuffer != ShaderInterfaceVariableInfo::kInvalid)
{
ASSERT(info->xfbStride != ShaderInterfaceVariableInfo::kInvalid);
ASSERT(info->xfbOffset != ShaderInterfaceVariableInfo::kInvalid);
constexpr size_t kXfbDecorationCount = 3;
constexpr uint32_t xfbDecorations[kXfbDecorationCount] = {
spv::DecorationXfbBuffer,
spv::DecorationXfbStride,
spv::DecorationOffset,
};
const uint32_t xfbDecorationValues[kXfbDecorationCount] = {
info->xfbBuffer,
info->xfbStride,
info->xfbOffset,
};
// Copy the location decoration declaration three times, and modify them to contain the
// XfbBuffer, XfbStride and Offset decorations.
for (size_t i = 0; i < kXfbDecorationCount; ++i)
{
const size_t xfbInstructionOffset = copyInstruction(instruction, wordCount);
(*mSpirvBlobOut)[xfbInstructionOffset + kDecorationIndex] = xfbDecorations[i];
(*mSpirvBlobOut)[xfbInstructionOffset + kDecorationValueIndex] = xfbDecorationValues[i];
}
}
return true;
}
bool SpirvTransformer::transformCapability(const uint32_t *instruction, size_t wordCount)
{
if (!mHasTransformFeedbackOutput)
{
return false;
}
// SPIR-V 1.0 Section 3.32 Instructions, OpCapability
constexpr size_t kCapabilityIndex = 1;
uint32_t capability = instruction[kCapabilityIndex];
// Transform feedback capability shouldn't have already been specified.
ASSERT(capability != spv::CapabilityTransformFeedback);
// Vulkan shaders have either Shader, Geometry or Tessellation capability. We find this
// capability, and add the TransformFeedback capability after it.
if (capability != spv::CapabilityShader && capability != spv::CapabilityGeometry &&
capability != spv::CapabilityTessellation)
{
return false;
}
// Copy the original capability declaration.
copyInstruction(instruction, wordCount);
// Create the TransformFeedback capability declaration.
// SPIR-V 1.0 Section 3.32 Instructions, OpCapability
constexpr size_t kCapabilityInstructionLength = 2;
std::array<uint32_t, kCapabilityInstructionLength> newCapabilityDeclaration = {
instruction[0], // length+opcode is identical
};
// Fill the fields.
newCapabilityDeclaration[kCapabilityIndex] = spv::CapabilityTransformFeedback;
copyInstruction(newCapabilityDeclaration.data(), kCapabilityInstructionLength);
return true;
}
bool SpirvTransformer::transformEntryPoint(const uint32_t *instruction, size_t wordCount)
{
// Remove inactive varyings from the shader interface declaration.
// SPIR-V 1.0 Section 3.32 Instructions, OpEntryPoint
constexpr size_t kNameIndex = 3;
// Calculate the length of entry point name in words. Note that endianness of the string
// doesn't matter, since we are looking for the '\0' character and rounding up to the word size.
// This calculates (strlen(name)+1+3) / 4, which is equal to strlen(name)/4+1.
const size_t nameLength =
strlen(reinterpret_cast<const char *>(&instruction[kNameIndex])) / 4 + 1;
const uint32_t instructionLength = GetSpirvInstructionLength(instruction);
const size_t interfaceStart = kNameIndex + nameLength;
const size_t interfaceCount = instructionLength - interfaceStart;
// Create a copy of the entry point for modification.
std::vector<uint32_t> filteredEntryPoint(instruction, instruction + wordCount);
// Filter out inactive varyings from entry point interface declaration.
size_t writeIndex = interfaceStart;
for (size_t index = 0; index < interfaceCount; ++index)
{
uint32_t id = instruction[interfaceStart + index];
const ShaderInterfaceVariableInfo *info = mVariableInfoById[id];
ASSERT(info);
if (!info->activeStages[mShaderType])
{
continue;
}
filteredEntryPoint[writeIndex] = id;
++writeIndex;
}
// Update the length of the instruction.
const size_t newLength = writeIndex;
SetSpirvInstructionLength(filteredEntryPoint.data(), newLength);
// Copy to output.
copyInstruction(filteredEntryPoint.data(), newLength);
// Add an OpExecutionMode Xfb instruction if necessary.
if (!mHasTransformFeedbackOutput)
{
return true;
}
// SPIR-V 1.0 Section 3.32 Instructions, OpEntryPoint
constexpr size_t kEntryPointIdIndex = 2;
// SPIR-V 1.0 Section 3.32 Instructions, OpExecutionMode
constexpr size_t kExecutionModeInstructionLength = 3;
constexpr size_t kExecutionModeIdIndex = 1;
constexpr size_t kExecutionModeExecutionModeIndex = 2;
std::array<uint32_t, kExecutionModeInstructionLength> newExecutionModeDeclaration = {};
// Fill the fields.
SetSpirvInstructionOp(newExecutionModeDeclaration.data(), spv::OpExecutionMode);
SetSpirvInstructionLength(newExecutionModeDeclaration.data(), kExecutionModeInstructionLength);
newExecutionModeDeclaration[kExecutionModeIdIndex] = instruction[kEntryPointIdIndex];
newExecutionModeDeclaration[kExecutionModeExecutionModeIndex] = spv::ExecutionModeXfb;
copyInstruction(newExecutionModeDeclaration.data(), kExecutionModeInstructionLength);
return true;
}
bool SpirvTransformer::transformTypePointer(const uint32_t *instruction, size_t wordCount)
{
// SPIR-V 1.0 Section 3.32 Instructions, OpTypePointer
constexpr size_t kIdIndex = 1;
constexpr size_t kStorageClassIndex = 2;
const uint32_t id = instruction[kIdIndex];
const uint32_t storageClass = instruction[kStorageClassIndex];
// If the storage class is output, this may be used to create a variable corresponding to an
// inactive varying, or if that varying is a struct, an Op*AccessChain retrieving a field of
// that inactive varying.
//
// Unfortunately, SPIR-V specifies the storage class both on the type and the variable
// declaration. Otherwise it would have been sufficient to modify the OpVariable instruction.
// For simplicty, copy every "OpTypePointer Output" instruction except with the Private storage
// class, in case it may be necessary later.
if (storageClass != spv::StorageClassOutput)
{
return false;
}
// Cannot create a Private type declaration from the builtin gl_PerVertex. Note that
// mVariableInfoById is only ever set for variables, except for nameless interface blocks and
// the builtin gl_PerVertex. Since the storage class is Output, if mVariableInfoById for this
// type is not nullptr, this must be a builtin.
const ShaderInterfaceVariableInfo *info = mVariableInfoById[id];
if (info)
{
ASSERT(info == &mBuiltinVariableInfo);
return false;
}
// Copy the type declaration for modification.
const size_t instructionOffset = copyInstruction(instruction, wordCount);
const uint32_t newTypeId = getNewId();
(*mSpirvBlobOut)[instructionOffset + kIdIndex] = newTypeId;
(*mSpirvBlobOut)[instructionOffset + kStorageClassIndex] = spv::StorageClassPrivate;
// Remember the id of the replacement.
ASSERT(id < mTypePointerTransformedId.size());
mTypePointerTransformedId[id] = newTypeId;
// The original instruction should still be present as well. At this point, we don't know
// whether we will need the Output or Private type.
return false;
}
bool SpirvTransformer::transformVariable(const uint32_t *instruction, size_t wordCount)
{
// SPIR-V 1.0 Section 3.32 Instructions, OpVariable
constexpr size_t kTypeIdIndex = 1;
constexpr size_t kIdIndex = 2;
constexpr size_t kStorageClassIndex = 3;
const uint32_t id = instruction[kIdIndex];
const uint32_t typeId = instruction[kTypeIdIndex];
const uint32_t storageClass = instruction[kStorageClassIndex];
const ShaderInterfaceVariableInfo *info = mVariableInfoById[id];
// If variable is not a shader interface variable that needs modification, there's nothing to
// do.
if (info == nullptr)
{
return false;
}
// Furthermore, if it's not an inactive varying output, there's nothing to do. Note that
// inactive varying inputs are already pruned by the translator.
ASSERT(storageClass != spv::StorageClassInput || info->activeStages[mShaderType]);
if (info->activeStages[mShaderType])
{
return false;
}
ASSERT(storageClass == spv::StorageClassOutput);
// Copy the variable declaration for modification. Change its type to the corresponding type
// with the Private storage class, as well as changing the storage class respecified in this
// instruction.
const size_t instructionOffset = copyInstruction(instruction, wordCount);
ASSERT(typeId < mTypePointerTransformedId.size());
ASSERT(mTypePointerTransformedId[typeId] != 0);
(*mSpirvBlobOut)[instructionOffset + kTypeIdIndex] = mTypePointerTransformedId[typeId];
(*mSpirvBlobOut)[instructionOffset + kStorageClassIndex] = spv::StorageClassPrivate;
return true;
}
bool SpirvTransformer::transformAccessChain(const uint32_t *instruction, size_t wordCount)
{
// SPIR-V 1.0 Section 3.32 Instructions, OpAccessChain, OpInBoundsAccessChain, OpPtrAccessChain,
// OpInBoundsPtrAccessChain
constexpr size_t kTypeIdIndex = 1;
constexpr size_t kBaseIdIndex = 3;
const uint32_t typeId = instruction[kTypeIdIndex];
const uint32_t baseId = instruction[kBaseIdIndex];
// If not accessing an inactive output varying, nothing to do.
const ShaderInterfaceVariableInfo *info = mVariableInfoById[baseId];
if (info == nullptr || info->activeStages[mShaderType])
{
return false;
}
// Copy the instruction for modification.
const size_t instructionOffset = copyInstruction(instruction, wordCount);
ASSERT(typeId < mTypePointerTransformedId.size());
ASSERT(mTypePointerTransformedId[typeId] != 0);
(*mSpirvBlobOut)[instructionOffset + kTypeIdIndex] = mTypePointerTransformedId[typeId];
return true;
}
size_t SpirvTransformer::copyInstruction(const uint32_t *instruction, size_t wordCount)
{
size_t instructionOffset = mSpirvBlobOut->size();
mSpirvBlobOut->insert(mSpirvBlobOut->end(), instruction, instruction + wordCount);
return instructionOffset;
}
uint32_t SpirvTransformer::getNewId()
{
return (*mSpirvBlobOut)[kHeaderIndexIndexBound]++;
}
} // anonymous namespace
const uint32_t ShaderInterfaceVariableInfo::kInvalid;
ShaderInterfaceVariableInfo::ShaderInterfaceVariableInfo()
{
location.fill(kInvalid);
component.fill(kInvalid);
}
void GlslangInitialize()
{
int result = ShInitialize();
ASSERT(result != 0);
}
void GlslangRelease()
{
int result = ShFinalize();
ASSERT(result != 0);
}
std::string GlslangGetMappedSamplerName(const std::string &originalName)
{
std::string samplerName = originalName;
// Samplers in structs are extracted.
std::replace(samplerName.begin(), samplerName.end(), '.', '_');
// Remove array elements
auto out = samplerName.begin();
for (auto in = samplerName.begin(); in != samplerName.end(); in++)
{
if (*in == '[')
{
while (*in != ']')
{
in++;
ASSERT(in != samplerName.end());
}
}
else
{
*out++ = *in;
}
}
samplerName.erase(out, samplerName.end());
if (MappedSamplerNameNeedsUserDefinedPrefix(originalName))
{
samplerName = sh::kUserDefinedNamePrefix + samplerName;
}
return samplerName;
}
void GlslangGetShaderSource(const GlslangSourceOptions &options,
const gl::ProgramState &programState,
const gl::ProgramLinkedResources &resources,
gl::ShaderMap<std::string> *shaderSourcesOut,
ShaderInterfaceVariableInfoMap *variableInfoMapOut)
{
variableInfoMapOut->clear();
uint32_t locationsUsedForXfbExtension = 0;
for (const gl::ShaderType shaderType : gl::AllShaderTypes())
{
gl::Shader *glShader = programState.getAttachedShader(shaderType);
(*shaderSourcesOut)[shaderType] = glShader ? glShader->getTranslatedSource() : "";
}
std::string *vertexSource = &(*shaderSourcesOut)[gl::ShaderType::Vertex];
const std::string &fragmentSource = (*shaderSourcesOut)[gl::ShaderType::Fragment];
const std::string &computeSource = (*shaderSourcesOut)[gl::ShaderType::Compute];
// Write transform feedback output code.
if (!vertexSource->empty())
{
if (programState.getLinkedTransformFeedbackVaryings().empty())
{
*vertexSource = SubstituteTransformFeedbackMarkers(*vertexSource, "", "");
}
else
{
if (options.supportsTransformFeedbackExtension)
{
GenerateTransformFeedbackExtensionOutputs(programState, resources, vertexSource,
variableInfoMapOut,
&locationsUsedForXfbExtension);
}
else if (options.emulateTransformFeedback)
{
GenerateTransformFeedbackEmulationOutputs(options, programState, vertexSource,
variableInfoMapOut);
}
}
}
// Assign outputs to the fragment shader, if any.
if (!fragmentSource.empty())
{
AssignOutputLocations(programState, variableInfoMapOut);
}
// Assign attributes to the vertex shader, if any.
if (!vertexSource->empty())
{
AssignAttributeLocations(programState, variableInfoMapOut);
}
if (computeSource.empty())
{
// Assign varying locations.
AssignVaryingLocations(options, programState, resources, locationsUsedForXfbExtension,
variableInfoMapOut);
if (!programState.getLinkedTransformFeedbackVaryings().empty() &&
options.supportsTransformFeedbackExtension)
{
AssignTransformFeedbackExtensionQualifiers(
programState, resources, locationsUsedForXfbExtension, variableInfoMapOut);
}
}
AssignUniformBindings(options, shaderSourcesOut, variableInfoMapOut);
AssignTextureBindings(options, programState, variableInfoMapOut);
AssignNonTextureBindings(options, programState, variableInfoMapOut);
}
angle::Result GlslangGetShaderSpirvCode(GlslangErrorCallback callback,
const gl::Caps &glCaps,
const gl::ShaderMap<std::string> &shaderSources,
const ShaderInterfaceVariableInfoMap &variableInfoMap,
gl::ShaderMap<SpirvBlob> *spirvBlobsOut)
{
gl::ShaderMap<std::vector<uint32_t>> initialSpirvBlobs;
ANGLE_TRY(GetShaderSpirvCode(callback, glCaps, shaderSources, &initialSpirvBlobs));
// Transform the SPIR-V code by assigning location/set/binding values.
for (const gl::ShaderType shaderType : gl::AllShaderTypes())
{
const std::vector<uint32_t> initialSpirvBlob = initialSpirvBlobs[shaderType];
if (initialSpirvBlob.empty())
{
continue;
}
SpirvBlob *spirvBlob = &(*spirvBlobsOut)[shaderType];
SpirvTransformer transformer(initialSpirvBlob, variableInfoMap, shaderType, spirvBlob);
ANGLE_GLSLANG_CHECK(callback, transformer.transform(), GlslangError::InvalidSpirv);
ASSERT(ValidateSpirv(*spirvBlob));
}
return angle::Result::Continue;
}
} // namespace rx