Split shader generation to a new module

include/Nazara/Shader/ShaderAstVisitor.hpp

@@ -0,0 +1,50 @@
+// 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_SHADERVISITOR_HPP
+#define NAZARA_SHADERVISITOR_HPP
+
+#include <Nazara/Prerequisites.hpp>
+#include <Nazara/Shader/Config.hpp>
+#include <Nazara/Shader/ShaderNodes.hpp>
+#include <string>
+#include <unordered_set>
+
+namespace Nz
+{
+	class NAZARA_SHADER_API ShaderAstVisitor
+	{
+		public:
+			ShaderAstVisitor() = default;
+			ShaderAstVisitor(const ShaderAstVisitor&) = delete;
+			ShaderAstVisitor(ShaderAstVisitor&&) = delete;
+			virtual ~ShaderAstVisitor();
+
+			void EnableCondition(const std::string& name, bool cond);
+
+			bool IsConditionEnabled(const std::string& name) const;
+
+			void Visit(const ShaderNodes::NodePtr& node);
+			virtual void Visit(ShaderNodes::AccessMember& node) = 0;
+			virtual void Visit(ShaderNodes::AssignOp& node) = 0;
+			virtual void Visit(ShaderNodes::BinaryOp& node) = 0;
+			virtual void Visit(ShaderNodes::Branch& node) = 0;
+			virtual void Visit(ShaderNodes::Cast& node) = 0;
+			virtual void Visit(ShaderNodes::Constant& node) = 0;
+			virtual void Visit(ShaderNodes::DeclareVariable& node) = 0;
+			virtual void Visit(ShaderNodes::ExpressionStatement& node) = 0;
+			virtual void Visit(ShaderNodes::Identifier& node) = 0;
+			virtual void Visit(ShaderNodes::IntrinsicCall& node) = 0;
+			virtual void Visit(ShaderNodes::Sample2D& node) = 0;
+			virtual void Visit(ShaderNodes::StatementBlock& node) = 0;
+			virtual void Visit(ShaderNodes::SwizzleOp& node) = 0;
+
+		private:
+			std::unordered_set<std::string> m_conditions;
+	};
+}
+
+#endif