Shader: First working version on both Vulkan & OpenGL (ES)

include/Nazara/Shader/Ast/TransformVisitor.hpp

@@ -0,0 +1,90 @@
+// Copyright (C) 2020 Jérôme Leclercq
+// This file is part of the "Nazara Engine - Shader generator"
+// For conditions of distribution and use, see copyright notice in Config.hpp
+
+#pragma once
+
+#ifndef NAZARA_SHADERAST_TRANSFORMVISITOR_HPP
+#define NAZARA_SHADERAST_TRANSFORMVISITOR_HPP
+
+#include <Nazara/Prerequisites.hpp>
+#include <Nazara/Shader/Config.hpp>
+#include <Nazara/Shader/ShaderAstCloner.hpp>
+#include <vector>
+
+namespace Nz::ShaderAst
+{
+	class NAZARA_SHADER_API TransformVisitor : AstCloner
+	{
+		public:
+			inline TransformVisitor();
+			TransformVisitor(const TransformVisitor&) = delete;
+			TransformVisitor(TransformVisitor&&) = delete;
+			~TransformVisitor() = default;
+
+			StatementPtr Transform(StatementPtr& statement);
+
+			TransformVisitor& operator=(const TransformVisitor&) = delete;
+			TransformVisitor& operator=(TransformVisitor&&) = delete;
+
+		private:
+			struct Identifier;
+
+			ExpressionPtr Clone(AccessMemberIdentifierExpression& node) override;
+			ExpressionPtr Clone(CastExpression& node) override;
+			ExpressionPtr Clone(IdentifierExpression& node) override;
+			ExpressionPtr CloneExpression(ExpressionPtr& expr) override;
+
+			inline const Identifier* FindIdentifier(const std::string_view& identifierName) const;
+
+			void PushScope();
+			void PopScope();
+
+			inline std::size_t RegisterFunction(std::string name);
+			inline std::size_t RegisterStruct(std::string name, StructDescription description);
+			inline std::size_t RegisterVariable(std::string name);
+
+			ExpressionType ResolveType(const ExpressionType& exprType);
+
+			using AstCloner::Visit;
+			void Visit(BranchStatement& node) override;
+			void Visit(ConditionalStatement& node) override;
+			void Visit(DeclareExternalStatement& node) override;
+			void Visit(DeclareFunctionStatement& node) override;
+			void Visit(DeclareStructStatement& node) override;
+			void Visit(DeclareVariableStatement& node) override;
+			void Visit(MultiStatement& node) override;
+
+			struct Alias
+			{
+				std::variant<ExpressionType> value;
+			};
+
+			struct Struct
+			{
+				std::size_t structIndex;
+			};
+
+			struct Variable
+			{
+				std::size_t varIndex;
+			};
+
+			struct Identifier
+			{
+				std::string name;
+				std::variant<Alias, Struct, Variable> value;
+			};
+
+		private:
+			std::size_t m_nextFuncIndex;
+			std::size_t m_nextVarIndex;
+			std::vector<Identifier> m_identifiersInScope;
+			std::vector<StructDescription> m_structs;
+			std::vector<std::size_t> m_scopeSizes;
+	};
+}
+
+#include <Nazara/Shader/Ast/TransformVisitor.inl>
+
+#endif