839 lines
20 KiB
C++
839 lines
20 KiB
C++
// Copyright (C) 2020 Jérôme Leclercq
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// This file is part of the "Nazara Engine - Shader generator"
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// For conditions of distribution and use, see copyright notice in Config.hpp
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#include <Nazara/Shader/LangWriter.hpp>
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#include <Nazara/Core/Algorithm.hpp>
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#include <Nazara/Core/CallOnExit.hpp>
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#include <Nazara/Math/Algorithm.hpp>
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#include <Nazara/Shader/ShaderBuilder.hpp>
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#include <Nazara/Shader/Ast/AstCloner.hpp>
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#include <Nazara/Shader/Ast/AstRecursiveVisitor.hpp>
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#include <Nazara/Shader/Ast/AstUtils.hpp>
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#include <Nazara/Shader/Ast/SanitizeVisitor.hpp>
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#include <optional>
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#include <stdexcept>
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#include <Nazara/Shader/Debug.hpp>
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namespace Nz
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{
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namespace
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{
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template<typename T> const T& Retrieve(const std::unordered_map<std::size_t, T>& map, std::size_t id)
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{
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auto it = map.find(id);
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assert(it != map.end());
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return it->second;
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}
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}
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struct LangWriter::BindingAttribute
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{
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std::optional<unsigned int> bindingIndex;
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inline bool HasValue() const { return bindingIndex.has_value(); }
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};
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struct LangWriter::BuiltinAttribute
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{
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std::optional<ShaderAst::BuiltinEntry> builtin;
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inline bool HasValue() const { return builtin.has_value(); }
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};
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struct LangWriter::DepthWriteAttribute
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{
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std::optional<ShaderAst::DepthWriteMode> writeMode;
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inline bool HasValue() const { return writeMode.has_value(); }
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};
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struct LangWriter::EarlyFragmentTestsAttribute
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{
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std::optional<bool> earlyFragmentTests;
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inline bool HasValue() const { return earlyFragmentTests.has_value(); }
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};
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struct LangWriter::EntryAttribute
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{
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std::optional<ShaderStageType> stageType;
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inline bool HasValue() const { return stageType.has_value(); }
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};
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struct LangWriter::LayoutAttribute
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{
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std::optional<StructLayout> layout;
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inline bool HasValue() const { return layout.has_value(); }
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};
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struct LangWriter::LocationAttribute
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{
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std::optional<unsigned int> locationIndex;
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inline bool HasValue() const { return locationIndex.has_value(); }
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};
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struct LangWriter::State
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{
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const States* states = nullptr;
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std::stringstream stream;
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std::unordered_map<std::size_t, std::string> optionNames;
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std::unordered_map<std::size_t, ShaderAst::StructDescription> structs;
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std::unordered_map<std::size_t, std::string> variableNames;
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bool isInEntryPoint = false;
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unsigned int indentLevel = 0;
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};
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std::string LangWriter::Generate(ShaderAst::StatementPtr& shader, const States& states)
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{
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State state;
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m_currentState = &state;
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CallOnExit onExit([this]()
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{
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m_currentState = nullptr;
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});
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ShaderAst::SanitizeVisitor::Options options;
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options.removeOptionDeclaration = false;
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ShaderAst::StatementPtr sanitizedAst = ShaderAst::Sanitize(shader, options);
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AppendHeader();
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sanitizedAst->Visit(*this);
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return state.stream.str();
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}
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void LangWriter::SetEnv(Environment environment)
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{
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m_environment = std::move(environment);
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}
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void LangWriter::Append(const ShaderAst::ExpressionType& type)
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{
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std::visit([&](auto&& arg)
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{
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Append(arg);
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}, type);
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}
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void LangWriter::Append(const ShaderAst::IdentifierType& /*identifierType*/)
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{
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throw std::runtime_error("unexpected identifier type");
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}
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void LangWriter::Append(const ShaderAst::MatrixType& matrixType)
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{
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if (matrixType.columnCount == matrixType.rowCount)
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{
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Append("mat");
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Append(matrixType.columnCount);
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}
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else
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{
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Append("mat");
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Append(matrixType.columnCount);
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Append("x");
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Append(matrixType.rowCount);
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}
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Append("<", matrixType.type, ">");
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}
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void LangWriter::Append(ShaderAst::PrimitiveType type)
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{
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switch (type)
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{
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case ShaderAst::PrimitiveType::Boolean: return Append("bool");
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case ShaderAst::PrimitiveType::Float32: return Append("f32");
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case ShaderAst::PrimitiveType::Int32: return Append("i32");
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case ShaderAst::PrimitiveType::UInt32: return Append("ui32");
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}
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}
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void LangWriter::Append(const ShaderAst::SamplerType& samplerType)
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{
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Append("sampler");
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switch (samplerType.dim)
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{
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case ImageType::E1D: Append("1D"); break;
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case ImageType::E1D_Array: Append("1DArray"); break;
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case ImageType::E2D: Append("2D"); break;
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case ImageType::E2D_Array: Append("2DArray"); break;
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case ImageType::E3D: Append("3D"); break;
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case ImageType::Cubemap: Append("Cube"); break;
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}
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Append("<", samplerType.sampledType, ">");
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}
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void LangWriter::Append(const ShaderAst::StructType& structType)
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{
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const auto& structDesc = Retrieve(m_currentState->structs, structType.structIndex);
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Append(structDesc.name);
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}
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void LangWriter::Append(const ShaderAst::UniformType& uniformType)
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{
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Append("uniform<");
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std::visit([&](auto&& arg)
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{
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Append(arg);
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}, uniformType.containedType);
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Append(">");
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}
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void LangWriter::Append(const ShaderAst::VectorType& vecType)
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{
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Append("vec", vecType.componentCount, "<", vecType.type, ">");
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}
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void LangWriter::Append(ShaderAst::NoType)
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{
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return Append("()");
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}
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template<typename T>
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void LangWriter::Append(const T& param)
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{
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NazaraAssert(m_currentState, "This function should only be called while processing an AST");
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m_currentState->stream << param;
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}
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template<typename T1, typename T2, typename... Args>
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void LangWriter::Append(const T1& firstParam, const T2& secondParam, Args&&... params)
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{
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Append(firstParam);
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Append(secondParam, std::forward<Args>(params)...);
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}
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template<typename ...Args>
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void LangWriter::AppendAttributes(bool appendLine, Args&&... params)
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{
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bool hasAnyAttribute = (params.HasValue() || ...);
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if (!hasAnyAttribute)
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return;
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Append("[");
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(AppendAttribute(params), ...);
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Append("]");
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if (appendLine)
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AppendLine();
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else
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Append(" ");
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}
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void LangWriter::AppendAttribute(BindingAttribute binding)
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{
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if (!binding.HasValue())
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return;
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Append("binding(", *binding.bindingIndex, ")");
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}
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void LangWriter::AppendAttribute(BuiltinAttribute builtin)
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{
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if (!builtin.HasValue())
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return;
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switch (*builtin.builtin)
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{
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case ShaderAst::BuiltinEntry::FragCoord:
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Append("builtin(fragcoord)");
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break;
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case ShaderAst::BuiltinEntry::FragDepth:
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Append("builtin(fragdepth)");
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break;
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case ShaderAst::BuiltinEntry::VertexPosition:
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Append("builtin(position)");
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break;
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}
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}
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void LangWriter::AppendAttribute(DepthWriteAttribute depthWrite)
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{
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if (!depthWrite.HasValue())
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return;
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switch (*depthWrite.writeMode)
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{
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case ShaderAst::DepthWriteMode::Greater:
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Append("depth_write(greater)");
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break;
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case ShaderAst::DepthWriteMode::Less:
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Append("depth_write(less)");
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break;
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case ShaderAst::DepthWriteMode::Replace:
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Append("depth_write(replace)");
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break;
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case ShaderAst::DepthWriteMode::Unchanged:
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Append("depth_write(unchanged)");
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break;
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}
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}
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void LangWriter::AppendAttribute(EarlyFragmentTestsAttribute earlyFragmentTests)
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{
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if (!earlyFragmentTests.HasValue())
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return;
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if (*earlyFragmentTests.earlyFragmentTests)
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Append("early_fragment_tests(on)");
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else
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Append("early_fragment_tests(off)");
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}
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void LangWriter::AppendAttribute(EntryAttribute entry)
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{
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if (!entry.HasValue())
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return;
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switch (*entry.stageType)
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{
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case ShaderStageType::Fragment:
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Append("entry(frag)");
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break;
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case ShaderStageType::Vertex:
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Append("entry(vert)");
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break;
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}
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}
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void LangWriter::AppendAttribute(LayoutAttribute entry)
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{
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if (!entry.HasValue())
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return;
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switch (*entry.layout)
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{
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case StructLayout::Std140:
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Append("layout(std140)");
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break;
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}
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}
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void LangWriter::AppendAttribute(LocationAttribute location)
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{
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if (!location.HasValue())
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return;
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Append("location(", *location.locationIndex, ")");
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}
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void LangWriter::AppendCommentSection(const std::string& section)
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{
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NazaraAssert(m_currentState, "This function should only be called while processing an AST");
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std::string stars((section.size() < 33) ? (36 - section.size()) / 2 : 3, '*');
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m_currentState->stream << "/*" << stars << ' ' << section << ' ' << stars << "*/";
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AppendLine();
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}
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void LangWriter::AppendField(std::size_t structIndex, const ShaderAst::ExpressionPtr* memberIndices, std::size_t remainingMembers)
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{
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const auto& structDesc = Retrieve(m_currentState->structs, structIndex);
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assert((*memberIndices)->GetType() == ShaderAst::NodeType::ConstantExpression);
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auto& constantValue = static_cast<ShaderAst::ConstantExpression&>(**memberIndices);
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Int32 index = std::get<Int32>(constantValue.value);
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const auto& member = structDesc.members[index];
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Append(".");
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Append(member.name);
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if (remainingMembers > 1)
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{
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assert(IsStructType(member.type));
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AppendField(std::get<ShaderAst::StructType>(member.type).structIndex, memberIndices + 1, remainingMembers - 1);
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}
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}
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void LangWriter::AppendLine(const std::string& txt)
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{
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NazaraAssert(m_currentState, "This function should only be called while processing an AST");
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m_currentState->stream << txt << '\n' << std::string(m_currentState->indentLevel, '\t');
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}
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template<typename... Args>
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void LangWriter::AppendLine(Args&&... params)
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{
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(Append(std::forward<Args>(params)), ...);
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AppendLine();
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}
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void LangWriter::AppendStatementList(std::vector<ShaderAst::StatementPtr>& statements)
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{
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bool first = true;
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for (const ShaderAst::StatementPtr& statement : statements)
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{
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if (!first && statement->GetType() != ShaderAst::NodeType::NoOpStatement)
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AppendLine();
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statement->Visit(*this);
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first = false;
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}
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}
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void LangWriter::EnterScope()
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{
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NazaraAssert(m_currentState, "This function should only be called while processing an AST");
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m_currentState->indentLevel++;
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AppendLine("{");
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}
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void LangWriter::LeaveScope(bool skipLine)
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{
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NazaraAssert(m_currentState, "This function should only be called while processing an AST");
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m_currentState->indentLevel--;
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AppendLine();
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if (skipLine)
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AppendLine("}");
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else
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Append("}");
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}
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void LangWriter::RegisterOption(std::size_t optionIndex, std::string optionName)
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{
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assert(m_currentState->optionNames.find(optionIndex) == m_currentState->optionNames.end());
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m_currentState->optionNames.emplace(optionIndex, std::move(optionName));
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}
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void LangWriter::RegisterStruct(std::size_t structIndex, ShaderAst::StructDescription desc)
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{
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assert(m_currentState->structs.find(structIndex) == m_currentState->structs.end());
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m_currentState->structs.emplace(structIndex, std::move(desc));
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}
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void LangWriter::RegisterVariable(std::size_t varIndex, std::string varName)
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{
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assert(m_currentState->variableNames.find(varIndex) == m_currentState->variableNames.end());
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m_currentState->variableNames.emplace(varIndex, std::move(varName));
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}
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void LangWriter::Visit(ShaderAst::ExpressionPtr& expr, bool encloseIfRequired)
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{
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bool enclose = encloseIfRequired && (GetExpressionCategory(*expr) != ShaderAst::ExpressionCategory::LValue);
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if (enclose)
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Append("(");
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expr->Visit(*this);
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if (enclose)
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Append(")");
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}
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void LangWriter::Visit(ShaderAst::AccessIndexExpression& node)
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{
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Visit(node.expr, true);
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const ShaderAst::ExpressionType& exprType = GetExpressionType(*node.expr);
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// For structs, convert indices to field names
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if (IsStructType(exprType))
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AppendField(std::get<ShaderAst::StructType>(exprType).structIndex, node.indices.data(), node.indices.size());
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else
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{
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// Array access
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for (ShaderAst::ExpressionPtr& expr : node.indices)
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{
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Append("[");
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Visit(expr);
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Append("]");
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}
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}
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}
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void LangWriter::Visit(ShaderAst::AssignExpression& node)
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{
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node.left->Visit(*this);
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switch (node.op)
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{
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case ShaderAst::AssignType::Simple:
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Append(" = ");
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break;
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}
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node.right->Visit(*this);
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}
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void LangWriter::Visit(ShaderAst::BranchStatement& node)
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{
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bool first = true;
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for (const auto& statement : node.condStatements)
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{
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if (!first)
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Append("else ");
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Append("if (");
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statement.condition->Visit(*this);
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AppendLine(")");
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EnterScope();
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statement.statement->Visit(*this);
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LeaveScope();
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first = false;
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}
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if (node.elseStatement)
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{
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AppendLine("else");
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EnterScope();
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node.elseStatement->Visit(*this);
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LeaveScope();
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}
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}
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void LangWriter::Visit(ShaderAst::BinaryExpression& node)
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{
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Visit(node.left, true);
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switch (node.op)
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{
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case ShaderAst::BinaryType::Add: Append(" + "); break;
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case ShaderAst::BinaryType::Subtract: Append(" - "); break;
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case ShaderAst::BinaryType::Multiply: Append(" * "); break;
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case ShaderAst::BinaryType::Divide: Append(" / "); break;
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case ShaderAst::BinaryType::CompEq: Append(" == "); break;
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case ShaderAst::BinaryType::CompGe: Append(" >= "); break;
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case ShaderAst::BinaryType::CompGt: Append(" > "); break;
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case ShaderAst::BinaryType::CompLe: Append(" <= "); break;
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case ShaderAst::BinaryType::CompLt: Append(" < "); break;
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case ShaderAst::BinaryType::CompNe: Append(" != "); break;
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}
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Visit(node.right, true);
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}
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void LangWriter::Visit(ShaderAst::CastExpression& node)
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{
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Append(node.targetType);
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Append("(");
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bool first = true;
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for (const auto& exprPtr : node.expressions)
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{
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if (!exprPtr)
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break;
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if (!first)
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m_currentState->stream << ", ";
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exprPtr->Visit(*this);
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first = false;
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}
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Append(")");
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}
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void LangWriter::Visit(ShaderAst::ConditionalExpression& node)
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{
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Append("select_opt(", Retrieve(m_currentState->optionNames, node.optionIndex), ", ");
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node.truePath->Visit(*this);
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Append(", ");
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node.falsePath->Visit(*this);
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Append(")");
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}
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void LangWriter::Visit(ShaderAst::ConditionalStatement& node)
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{
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Append("[opt(", Retrieve(m_currentState->optionNames, node.optionIndex), ")]");
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node.statement->Visit(*this);
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}
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void LangWriter::Visit(ShaderAst::ConstantExpression& node)
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{
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std::visit([&](auto&& arg)
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{
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using T = std::decay_t<decltype(arg)>;
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if constexpr (std::is_same_v<T, bool>)
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Append((arg) ? "true" : "false");
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else if constexpr (std::is_same_v<T, float> || std::is_same_v<T, Int32> || std::is_same_v<T, UInt32>)
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Append(std::to_string(arg));
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else if constexpr (std::is_same_v<T, Vector2f>)
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Append("vec2<f32>(" + std::to_string(arg.x) + ", " + std::to_string(arg.y) + ")");
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else if constexpr (std::is_same_v<T, Vector2i32>)
|
|
Append("vec2<i32>(" + std::to_string(arg.x) + ", " + std::to_string(arg.y) + ")");
|
|
else if constexpr (std::is_same_v<T, Vector3f>)
|
|
Append("vec3<f32>(" + std::to_string(arg.x) + ", " + std::to_string(arg.y) + ", " + std::to_string(arg.z) + ")");
|
|
else if constexpr (std::is_same_v<T, Vector3i32>)
|
|
Append("vec3<i32>(" + std::to_string(arg.x) + ", " + std::to_string(arg.y) + ", " + std::to_string(arg.z) + ")");
|
|
else if constexpr (std::is_same_v<T, Vector4f>)
|
|
Append("vec4<f32>(" + std::to_string(arg.x) + ", " + std::to_string(arg.y) + ", " + std::to_string(arg.z) + ", " + std::to_string(arg.w) + ")");
|
|
else if constexpr (std::is_same_v<T, Vector4i32>)
|
|
Append("vec4<i32>(" + std::to_string(arg.x) + ", " + std::to_string(arg.y) + ", " + std::to_string(arg.z) + ", " + std::to_string(arg.w) + ")");
|
|
else
|
|
static_assert(AlwaysFalse<T>::value, "non-exhaustive visitor");
|
|
}, node.value);
|
|
}
|
|
|
|
void LangWriter::Visit(ShaderAst::DeclareExternalStatement& node)
|
|
{
|
|
assert(node.varIndex);
|
|
std::size_t varIndex = *node.varIndex;
|
|
|
|
AppendLine("external");
|
|
EnterScope();
|
|
|
|
bool first = true;
|
|
for (const auto& externalVar : node.externalVars)
|
|
{
|
|
if (!first)
|
|
AppendLine(",");
|
|
|
|
first = false;
|
|
|
|
AppendAttributes(false, BindingAttribute{ externalVar.bindingIndex });
|
|
Append(externalVar.name, ": ", externalVar.type);
|
|
|
|
RegisterVariable(varIndex++, externalVar.name);
|
|
}
|
|
|
|
LeaveScope();
|
|
}
|
|
|
|
void LangWriter::Visit(ShaderAst::DeclareFunctionStatement& node)
|
|
{
|
|
NazaraAssert(m_currentState, "This function should only be called while processing an AST");
|
|
|
|
std::optional<std::size_t> varIndexOpt = node.varIndex;
|
|
|
|
AppendAttributes(true, EntryAttribute{ node.entryStage }, EarlyFragmentTestsAttribute{ node.earlyFragmentTests }, DepthWriteAttribute{ node.depthWrite });
|
|
Append("fn ", node.name, "(");
|
|
for (std::size_t i = 0; i < node.parameters.size(); ++i)
|
|
{
|
|
if (i != 0)
|
|
Append(", ");
|
|
|
|
Append(node.parameters[i].name);
|
|
Append(": ");
|
|
Append(node.parameters[i].type);
|
|
|
|
assert(varIndexOpt);
|
|
std::size_t& varIndex = *varIndexOpt;
|
|
RegisterVariable(varIndex++, node.parameters[i].name);
|
|
}
|
|
Append(")");
|
|
if (!IsNoType(node.returnType))
|
|
Append(" -> ", node.returnType);
|
|
|
|
AppendLine();
|
|
EnterScope();
|
|
{
|
|
AppendStatementList(node.statements);
|
|
}
|
|
LeaveScope();
|
|
}
|
|
|
|
void LangWriter::Visit(ShaderAst::DeclareOptionStatement& node)
|
|
{
|
|
assert(node.optIndex);
|
|
RegisterOption(*node.optIndex, node.optName);
|
|
|
|
Append("option ", node.optName, ": ", node.optType);
|
|
if (node.initialValue)
|
|
{
|
|
Append(" = ");
|
|
node.initialValue->Visit(*this);
|
|
}
|
|
|
|
Append(";");
|
|
}
|
|
|
|
void LangWriter::Visit(ShaderAst::DeclareStructStatement& node)
|
|
{
|
|
assert(node.structIndex);
|
|
RegisterStruct(*node.structIndex, node.description);
|
|
|
|
AppendAttributes(true, LayoutAttribute{ node.description.layout });
|
|
Append("struct ");
|
|
AppendLine(node.description.name);
|
|
EnterScope();
|
|
{
|
|
bool first = true;
|
|
for (const auto& member : node.description.members)
|
|
{
|
|
if (!first)
|
|
AppendLine(",");
|
|
|
|
first = false;
|
|
|
|
AppendAttributes(false, LocationAttribute{ member.locationIndex }, BuiltinAttribute{ member.builtin });
|
|
Append(member.name, ": ", member.type);
|
|
}
|
|
}
|
|
LeaveScope();
|
|
}
|
|
|
|
void LangWriter::Visit(ShaderAst::DeclareVariableStatement& node)
|
|
{
|
|
assert(node.varIndex);
|
|
RegisterVariable(*node.varIndex, node.varName);
|
|
|
|
Append("let ", node.varName, ": ", node.varType);
|
|
if (node.initialExpression)
|
|
{
|
|
Append(" = ");
|
|
node.initialExpression->Visit(*this);
|
|
}
|
|
|
|
Append(";");
|
|
}
|
|
|
|
void LangWriter::Visit(ShaderAst::DiscardStatement& /*node*/)
|
|
{
|
|
Append("discard;");
|
|
}
|
|
|
|
void LangWriter::Visit(ShaderAst::ExpressionStatement& node)
|
|
{
|
|
node.expression->Visit(*this);
|
|
Append(";");
|
|
}
|
|
|
|
void LangWriter::Visit(ShaderAst::IntrinsicExpression& node)
|
|
{
|
|
switch (node.intrinsic)
|
|
{
|
|
case ShaderAst::IntrinsicType::CrossProduct:
|
|
Append("cross");
|
|
break;
|
|
|
|
case ShaderAst::IntrinsicType::DotProduct:
|
|
Append("dot");
|
|
break;
|
|
|
|
case ShaderAst::IntrinsicType::Length:
|
|
Append("length");
|
|
break;
|
|
|
|
case ShaderAst::IntrinsicType::Max:
|
|
Append("max");
|
|
break;
|
|
|
|
case ShaderAst::IntrinsicType::Min:
|
|
Append("min");
|
|
break;
|
|
|
|
case ShaderAst::IntrinsicType::SampleTexture:
|
|
Append("texture");
|
|
break;
|
|
}
|
|
|
|
Append("(");
|
|
for (std::size_t i = 0; i < node.parameters.size(); ++i)
|
|
{
|
|
if (i != 0)
|
|
Append(", ");
|
|
|
|
node.parameters[i]->Visit(*this);
|
|
}
|
|
Append(")");
|
|
}
|
|
|
|
void LangWriter::Visit(ShaderAst::MultiStatement& node)
|
|
{
|
|
AppendStatementList(node.statements);
|
|
}
|
|
|
|
void LangWriter::Visit(ShaderAst::NoOpStatement& /*node*/)
|
|
{
|
|
/* nothing to do */
|
|
}
|
|
|
|
void LangWriter::Visit(ShaderAst::ReturnStatement& node)
|
|
{
|
|
if (node.returnExpr)
|
|
{
|
|
Append("return ");
|
|
node.returnExpr->Visit(*this);
|
|
Append(";");
|
|
}
|
|
else
|
|
Append("return;");
|
|
}
|
|
|
|
void LangWriter::Visit(ShaderAst::SwizzleExpression& node)
|
|
{
|
|
Visit(node.expression, true);
|
|
Append(".");
|
|
|
|
for (std::size_t i = 0; i < node.componentCount; ++i)
|
|
{
|
|
switch (node.components[i])
|
|
{
|
|
case ShaderAst::SwizzleComponent::First:
|
|
Append("x");
|
|
break;
|
|
|
|
case ShaderAst::SwizzleComponent::Second:
|
|
Append("y");
|
|
break;
|
|
|
|
case ShaderAst::SwizzleComponent::Third:
|
|
Append("z");
|
|
break;
|
|
|
|
case ShaderAst::SwizzleComponent::Fourth:
|
|
Append("w");
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
void LangWriter::Visit(ShaderAst::VariableExpression& node)
|
|
{
|
|
const std::string& varName = Retrieve(m_currentState->variableNames, node.variableId);
|
|
Append(varName);
|
|
}
|
|
|
|
void LangWriter::Visit(ShaderAst::UnaryExpression& node)
|
|
{
|
|
switch (node.op)
|
|
{
|
|
case ShaderAst::UnaryType::LogicalNot:
|
|
Append("!");
|
|
break;
|
|
|
|
case ShaderAst::UnaryType::Minus:
|
|
Append("-");
|
|
break;
|
|
|
|
case ShaderAst::UnaryType::Plus:
|
|
Append("+");
|
|
break;
|
|
}
|
|
|
|
node.expression->Visit(*this);
|
|
}
|
|
|
|
void LangWriter::AppendHeader()
|
|
{
|
|
// Nothing yet
|
|
}
|
|
}
|