1094 lines
25 KiB
C++
1094 lines
25 KiB
C++
// Copyright (C) 2022 Jérôme "Lynix" Leclercq (lynix680@gmail.com)
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// This file is part of the "Nazara Engine - Shader module"
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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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const ShaderAst::ExpressionValue<UInt32>& bindingIndex;
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inline bool HasValue() const { return bindingIndex.HasValue(); }
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};
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struct LangWriter::BuiltinAttribute
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{
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const ShaderAst::ExpressionValue<ShaderAst::BuiltinEntry>& builtin;
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inline bool HasValue() const { return builtin.HasValue(); }
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};
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struct LangWriter::DepthWriteAttribute
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{
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const ShaderAst::ExpressionValue<ShaderAst::DepthWriteMode>& writeMode;
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inline bool HasValue() const { return writeMode.HasValue(); }
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};
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struct LangWriter::EarlyFragmentTestsAttribute
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{
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const ShaderAst::ExpressionValue<bool>& earlyFragmentTests;
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inline bool HasValue() const { return earlyFragmentTests.HasValue(); }
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};
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struct LangWriter::EntryAttribute
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{
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const ShaderAst::ExpressionValue<ShaderStageType>& stageType;
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inline bool HasValue() const { return stageType.HasValue(); }
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};
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struct LangWriter::LayoutAttribute
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{
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const ShaderAst::ExpressionValue<StructLayout>& layout;
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inline bool HasValue() const { return layout.HasValue(); }
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};
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struct LangWriter::LocationAttribute
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{
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const ShaderAst::ExpressionValue<UInt32>& locationIndex;
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inline bool HasValue() const { return locationIndex.HasValue(); }
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};
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struct LangWriter::SetAttribute
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{
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const ShaderAst::ExpressionValue<UInt32>& setIndex;
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inline bool HasValue() const { return setIndex.HasValue(); }
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};
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struct LangWriter::UnrollAttribute
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{
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const ShaderAst::ExpressionValue<ShaderAst::LoopUnroll>& unroll;
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inline bool HasValue() const { return unroll.HasValue(); }
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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> constantNames;
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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::Statement& 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::StatementPtr sanitizedAst = ShaderAst::Sanitize(shader);
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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::ArrayType& type)
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{
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Append("array[", type.containedType->type, ", ", type.length, "]");
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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::ExpressionValue<ShaderAst::ExpressionType>& type)
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{
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Append(type.GetResultingValue());
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}
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void LangWriter::Append(const ShaderAst::FunctionType& /*functionType*/)
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{
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throw std::runtime_error("unexpected function 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::IntrinsicFunctionType& /*functionType*/)
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{
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throw std::runtime_error("unexpected intrinsic function 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(const ShaderAst::MethodType& /*functionType*/)
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{
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throw std::runtime_error("unexpected method 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("u32");
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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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ShaderAst::StructDescription* 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::Type& /*type*/)
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{
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throw std::runtime_error("unexpected type?");
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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[", uniformType.containedType, "]");
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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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bool first = true;
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Append("[");
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AppendAttributesInternal(first, std::forward<Args>(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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template<typename T>
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void LangWriter::AppendAttributesInternal(bool& first, const T& param)
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{
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if (!param.HasValue())
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return;
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if (!first)
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Append(", ");
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first = false;
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AppendAttribute(param);
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}
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template<typename T1, typename T2, typename... Rest>
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void LangWriter::AppendAttributesInternal(bool& first, const T1& firstParam, const T2& secondParam, Rest&&... params)
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{
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AppendAttributesInternal(first, firstParam);
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AppendAttributesInternal(first, secondParam, std::forward<Rest>(params)...);
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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(");
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if (binding.bindingIndex.IsResultingValue())
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Append(binding.bindingIndex.GetResultingValue());
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else
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binding.bindingIndex.GetExpression()->Visit(*this);
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Append(")");
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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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Append("builtin(");
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if (builtin.builtin.IsResultingValue())
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{
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switch (builtin.builtin.GetResultingValue())
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{
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case ShaderAst::BuiltinEntry::FragCoord:
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Append("fragcoord");
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break;
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case ShaderAst::BuiltinEntry::FragDepth:
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Append("fragdepth");
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break;
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case ShaderAst::BuiltinEntry::VertexPosition:
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Append("position");
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break;
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}
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}
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else
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builtin.builtin.GetExpression()->Visit(*this);
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Append(")");
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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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Append("depth_write(");
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if (depthWrite.writeMode.IsResultingValue())
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{
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switch (depthWrite.writeMode.GetResultingValue())
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{
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case ShaderAst::DepthWriteMode::Greater:
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Append("greater");
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break;
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case ShaderAst::DepthWriteMode::Less:
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Append("less");
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break;
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case ShaderAst::DepthWriteMode::Replace:
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Append("replace");
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break;
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case ShaderAst::DepthWriteMode::Unchanged:
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Append("unchanged");
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break;
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}
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}
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else
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depthWrite.writeMode.GetExpression()->Visit(*this);
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Append(")");
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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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Append("early_fragment_tests(");
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if (earlyFragmentTests.earlyFragmentTests.IsResultingValue())
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{
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if (earlyFragmentTests.earlyFragmentTests.GetResultingValue())
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Append("true");
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else
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Append("false");
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}
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else
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earlyFragmentTests.earlyFragmentTests.GetExpression()->Visit(*this);
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Append(")");
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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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Append("entry(");
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if (entry.stageType.IsResultingValue())
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{
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switch (entry.stageType.GetResultingValue())
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{
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case ShaderStageType::Fragment:
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Append("frag");
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break;
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case ShaderStageType::Vertex:
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Append("vert");
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break;
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}
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}
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else
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entry.stageType.GetExpression()->Visit(*this);
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Append(")");
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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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Append("layout(");
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if (entry.layout.IsResultingValue())
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{
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switch (entry.layout.GetResultingValue())
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{
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case StructLayout::Packed:
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Append("packed");
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break;
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case StructLayout::Std140:
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Append("std140");
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break;
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}
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}
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else
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entry.layout.GetExpression()->Visit(*this);
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Append(")");
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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(");
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if (location.locationIndex.IsResultingValue())
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Append(location.locationIndex.GetResultingValue());
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else
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location.locationIndex.GetExpression()->Visit(*this);
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Append(")");
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}
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void LangWriter::AppendAttribute(SetAttribute set)
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{
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if (!set.HasValue())
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return;
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Append("set(");
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if (set.setIndex.IsResultingValue())
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Append(set.setIndex.GetResultingValue());
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else
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set.setIndex.GetExpression()->Visit(*this);
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Append(")");
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}
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void LangWriter::AppendAttribute(UnrollAttribute unroll)
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{
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if (!unroll.HasValue())
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return;
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Append("unroll(");
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if (unroll.unroll.IsResultingValue())
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{
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switch (unroll.unroll.GetResultingValue())
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{
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case ShaderAst::LoopUnroll::Always:
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Append("always");
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break;
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case ShaderAst::LoopUnroll::Hint:
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Append("hint");
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break;
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case ShaderAst::LoopUnroll::Never:
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Append("never");
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break;
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default:
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break;
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}
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}
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else
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unroll.unroll.GetExpression()->Visit(*this);
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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::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 (statement->GetType() == ShaderAst::NodeType::NoOpStatement)
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continue;
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if (!first)
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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::RegisterConstant(std::size_t constantIndex, std::string constantName)
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{
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assert(m_currentState->constantNames.find(constantIndex) == m_currentState->constantNames.end());
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m_currentState->constantNames.emplace(constantIndex, std::move(constantName));
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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, 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::ScopeVisit(ShaderAst::Statement& node)
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{
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if (node.GetType() != ShaderAst::NodeType::ScopedStatement)
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{
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EnterScope();
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node.Visit(*this);
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LeaveScope(true);
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}
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else
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node.Visit(*this);
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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::AccessIdentifierExpression& node)
|
|
{
|
|
Visit(node.expr, true);
|
|
|
|
const ShaderAst::ExpressionType& exprType = GetExpressionType(*node.expr);
|
|
assert(IsStructType(exprType));
|
|
|
|
for (const std::string& identifier : node.identifiers)
|
|
Append(".", identifier);
|
|
}
|
|
|
|
void LangWriter::Visit(ShaderAst::AccessIndexExpression& node)
|
|
{
|
|
Visit(node.expr, true);
|
|
|
|
const ShaderAst::ExpressionType& exprType = GetExpressionType(*node.expr);
|
|
assert(!IsStructType(exprType));
|
|
|
|
// Array access
|
|
Append("[");
|
|
|
|
bool first = true;
|
|
for (ShaderAst::ExpressionPtr& expr : node.indices)
|
|
{
|
|
if (!first)
|
|
Append(", ");
|
|
|
|
expr->Visit(*this);
|
|
first = false;
|
|
}
|
|
|
|
Append("]");
|
|
}
|
|
|
|
void LangWriter::Visit(ShaderAst::AssignExpression& node)
|
|
{
|
|
node.left->Visit(*this);
|
|
|
|
switch (node.op)
|
|
{
|
|
case ShaderAst::AssignType::Simple: Append(" = "); break;
|
|
case ShaderAst::AssignType::CompoundAdd: Append(" += "); break;
|
|
case ShaderAst::AssignType::CompoundDivide: Append(" /= "); break;
|
|
case ShaderAst::AssignType::CompoundMultiply: Append(" *= "); break;
|
|
case ShaderAst::AssignType::CompoundLogicalAnd: Append(" &&= "); break;
|
|
case ShaderAst::AssignType::CompoundLogicalOr: Append(" ||= "); break;
|
|
case ShaderAst::AssignType::CompoundSubtract: Append(" -= "); break;
|
|
}
|
|
|
|
node.right->Visit(*this);
|
|
}
|
|
|
|
void LangWriter::Visit(ShaderAst::BranchStatement& node)
|
|
{
|
|
bool first = true;
|
|
for (const auto& statement : node.condStatements)
|
|
{
|
|
if (!first)
|
|
Append("else ");
|
|
|
|
Append("if (");
|
|
statement.condition->Visit(*this);
|
|
AppendLine(")");
|
|
|
|
ScopeVisit(*statement.statement);
|
|
|
|
first = false;
|
|
}
|
|
|
|
if (node.elseStatement)
|
|
{
|
|
AppendLine("else");
|
|
|
|
ScopeVisit(*node.elseStatement);
|
|
}
|
|
}
|
|
|
|
void LangWriter::Visit(ShaderAst::BinaryExpression& node)
|
|
{
|
|
Visit(node.left, true);
|
|
|
|
switch (node.op)
|
|
{
|
|
case ShaderAst::BinaryType::Add: Append(" + "); break;
|
|
case ShaderAst::BinaryType::Subtract: Append(" - "); break;
|
|
case ShaderAst::BinaryType::Multiply: Append(" * "); break;
|
|
case ShaderAst::BinaryType::Divide: Append(" / "); break;
|
|
|
|
case ShaderAst::BinaryType::CompEq: Append(" == "); break;
|
|
case ShaderAst::BinaryType::CompGe: Append(" >= "); break;
|
|
case ShaderAst::BinaryType::CompGt: Append(" > "); break;
|
|
case ShaderAst::BinaryType::CompLe: Append(" <= "); break;
|
|
case ShaderAst::BinaryType::CompLt: Append(" < "); break;
|
|
case ShaderAst::BinaryType::CompNe: Append(" != "); break;
|
|
|
|
case ShaderAst::BinaryType::LogicalAnd: Append(" && "); break;
|
|
case ShaderAst::BinaryType::LogicalOr: Append(" || "); break;
|
|
}
|
|
|
|
Visit(node.right, true);
|
|
}
|
|
|
|
void LangWriter::Visit(ShaderAst::CastExpression& node)
|
|
{
|
|
Append(node.targetType);
|
|
Append("(");
|
|
|
|
bool first = true;
|
|
for (const auto& exprPtr : node.expressions)
|
|
{
|
|
if (!exprPtr)
|
|
break;
|
|
|
|
if (!first)
|
|
m_currentState->stream << ", ";
|
|
|
|
exprPtr->Visit(*this);
|
|
first = false;
|
|
}
|
|
|
|
Append(")");
|
|
}
|
|
|
|
void LangWriter::Visit(ShaderAst::ConditionalExpression& node)
|
|
{
|
|
throw std::runtime_error("fixme");
|
|
}
|
|
|
|
void LangWriter::Visit(ShaderAst::ConditionalStatement& node)
|
|
{
|
|
Append("[cond(");
|
|
node.condition->Visit(*this);
|
|
AppendLine(")]");
|
|
node.statement->Visit(*this);
|
|
}
|
|
|
|
void LangWriter::Visit(ShaderAst::DeclareConstStatement& node)
|
|
{
|
|
assert(node.constIndex);
|
|
RegisterConstant(*node.constIndex, node.name);
|
|
|
|
Append("const ", node.name, ": ", node.type);
|
|
if (node.expression)
|
|
{
|
|
Append(" = ");
|
|
node.expression->Visit(*this);
|
|
}
|
|
|
|
Append(";");
|
|
}
|
|
|
|
void LangWriter::Visit(ShaderAst::ConstantValueExpression& node)
|
|
{
|
|
std::visit([&](auto&& arg)
|
|
{
|
|
using T = std::decay_t<decltype(arg)>;
|
|
|
|
if constexpr (std::is_same_v<T, ShaderAst::NoValue>)
|
|
throw std::runtime_error("invalid type (value expected)");
|
|
else if constexpr (std::is_same_v<T, bool>)
|
|
Append((arg) ? "true" : "false");
|
|
else if constexpr (std::is_same_v<T, float> || std::is_same_v<T, Int32> || std::is_same_v<T, UInt32>)
|
|
Append(std::to_string(arg));
|
|
else if constexpr (std::is_same_v<T, Vector2f>)
|
|
Append("vec2[f32](" + std::to_string(arg.x) + ", " + std::to_string(arg.y) + ")");
|
|
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::ConstantExpression& node)
|
|
{
|
|
Append(Retrieve(m_currentState->constantNames, node.constantId));
|
|
}
|
|
|
|
void LangWriter::Visit(ShaderAst::DeclareExternalStatement& node)
|
|
{
|
|
AppendLine("external");
|
|
EnterScope();
|
|
|
|
bool first = true;
|
|
for (const auto& externalVar : node.externalVars)
|
|
{
|
|
if (!first)
|
|
AppendLine(",");
|
|
|
|
first = false;
|
|
|
|
AppendAttributes(false, SetAttribute{ externalVar.bindingSet }, BindingAttribute{ externalVar.bindingIndex });
|
|
Append(externalVar.name, ": ", externalVar.type);
|
|
|
|
assert(externalVar.varIndex);
|
|
RegisterVariable(*externalVar.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 (node.returnType.HasValue())
|
|
{
|
|
const ShaderAst::ExpressionType& returnType = node.returnType.GetResultingValue();
|
|
if (!IsNoType(returnType))
|
|
Append(" -> ", returnType);
|
|
}
|
|
|
|
AppendLine();
|
|
EnterScope();
|
|
{
|
|
AppendStatementList(node.statements);
|
|
}
|
|
LeaveScope();
|
|
}
|
|
|
|
void LangWriter::Visit(ShaderAst::DeclareOptionStatement& node)
|
|
{
|
|
assert(node.optIndex);
|
|
RegisterConstant(*node.optIndex, node.optName);
|
|
|
|
Append("option ", node.optName, ": ", node.optType);
|
|
if (node.defaultValue)
|
|
{
|
|
Append(" = ");
|
|
node.defaultValue->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::ForStatement& node)
|
|
{
|
|
assert(node.varIndex);
|
|
RegisterVariable(*node.varIndex, node.varName);
|
|
|
|
AppendAttributes(true, UnrollAttribute{ node.unroll });
|
|
Append("for ", node.varName, " in ");
|
|
node.fromExpr->Visit(*this);
|
|
Append(" -> ");
|
|
node.toExpr->Visit(*this);
|
|
|
|
if (node.stepExpr)
|
|
{
|
|
Append(" : ");
|
|
node.stepExpr->Visit(*this);
|
|
}
|
|
|
|
AppendLine();
|
|
|
|
ScopeVisit(*node.statement);
|
|
}
|
|
|
|
void LangWriter::Visit(ShaderAst::ForEachStatement& node)
|
|
{
|
|
assert(node.varIndex);
|
|
RegisterVariable(*node.varIndex, node.varName);
|
|
|
|
AppendAttributes(true, UnrollAttribute{ node.unroll });
|
|
Append("for ", node.varName, " in ");
|
|
node.expression->Visit(*this);
|
|
AppendLine();
|
|
|
|
ScopeVisit(*node.statement);
|
|
}
|
|
|
|
void LangWriter::Visit(ShaderAst::IntrinsicExpression& node)
|
|
{
|
|
bool method = false;
|
|
switch (node.intrinsic)
|
|
{
|
|
case ShaderAst::IntrinsicType::CrossProduct:
|
|
Append("cross");
|
|
break;
|
|
|
|
case ShaderAst::IntrinsicType::DotProduct:
|
|
Append("dot");
|
|
break;
|
|
|
|
case ShaderAst::IntrinsicType::Exp:
|
|
Append("exp");
|
|
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::Normalize:
|
|
Append("normalize");
|
|
break;
|
|
|
|
case ShaderAst::IntrinsicType::Pow:
|
|
Append("pow");
|
|
break;
|
|
|
|
case ShaderAst::IntrinsicType::Reflect:
|
|
Append("reflect");
|
|
break;
|
|
|
|
case ShaderAst::IntrinsicType::SampleTexture:
|
|
assert(!node.parameters.empty());
|
|
Visit(node.parameters.front(), true);
|
|
Append(".Sample");
|
|
method = true;
|
|
break;
|
|
}
|
|
|
|
Append("(");
|
|
bool first = true;
|
|
for (std::size_t i = (method) ? 1 : 0; i < node.parameters.size(); ++i)
|
|
{
|
|
if (!first)
|
|
Append(", ");
|
|
|
|
first = false;
|
|
|
|
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::ScopedStatement& node)
|
|
{
|
|
EnterScope();
|
|
node.statement->Visit(*this);
|
|
LeaveScope(true);
|
|
}
|
|
|
|
void LangWriter::Visit(ShaderAst::SwizzleExpression& node)
|
|
{
|
|
Visit(node.expression, true);
|
|
Append(".");
|
|
|
|
const char* componentStr = "xyzw";
|
|
for (std::size_t i = 0; i < node.componentCount; ++i)
|
|
Append(componentStr[node.components[i]]);
|
|
}
|
|
|
|
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::Visit(ShaderAst::WhileStatement& node)
|
|
{
|
|
Append("while (");
|
|
node.condition->Visit(*this);
|
|
AppendLine(")");
|
|
|
|
ScopeVisit(*node.body);
|
|
}
|
|
|
|
void LangWriter::AppendHeader()
|
|
{
|
|
// Nothing yet
|
|
}
|
|
}
|