Shader: Remove ShaderNode::GetExpressionType (replaced by visitor) and minor stuff

src/Nazara/Shader/ShaderAstUtils.cpp

@@ -0,0 +1,73 @@
+// 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
+
+#include <Nazara/Shader/ShaderAstUtils.hpp>
+#include <Nazara/Shader/Debug.hpp>
+
+namespace Nz
+{
+	ShaderNodes::ExpressionCategory ShaderAstValueCategory::GetExpressionCategory(const ShaderNodes::ExpressionPtr& expression)
+	{
+		Visit(expression);
+		return m_expressionCategory;
+	}
+
+	void ShaderAstValueCategory::Visit(ShaderNodes::AccessMember& node)
+	{
+		Visit(node.structExpr);
+	}
+
+	void ShaderAstValueCategory::Visit(ShaderNodes::AssignOp& node)
+	{
+		m_expressionCategory = ShaderNodes::ExpressionCategory::RValue;
+	}
+
+	void ShaderAstValueCategory::Visit(ShaderNodes::BinaryOp& node)
+	{
+		m_expressionCategory = ShaderNodes::ExpressionCategory::RValue;
+	}
+
+	void ShaderAstValueCategory::Visit(ShaderNodes::Cast& node)
+	{
+		m_expressionCategory = ShaderNodes::ExpressionCategory::RValue;
+	}
+
+	void ShaderAstValueCategory::Visit(ShaderNodes::ConditionalExpression& node)
+	{
+		Visit(node.truePath);
+		ShaderNodes::ExpressionCategory trueExprCategory = m_expressionCategory;
+		Visit(node.falsePath);
+		ShaderNodes::ExpressionCategory falseExprCategory = m_expressionCategory;
+
+		if (trueExprCategory == ShaderNodes::ExpressionCategory::RValue || falseExprCategory == ShaderNodes::ExpressionCategory::RValue)
+			m_expressionCategory = ShaderNodes::ExpressionCategory::RValue;
+		else
+			m_expressionCategory = ShaderNodes::ExpressionCategory::LValue;
+	}
+
+	void ShaderAstValueCategory::Visit(ShaderNodes::Constant& node)
+	{
+		m_expressionCategory = ShaderNodes::ExpressionCategory::RValue;
+	}
+
+	void ShaderAstValueCategory::Visit(ShaderNodes::Identifier& node)
+	{
+		m_expressionCategory = ShaderNodes::ExpressionCategory::LValue;
+	}
+
+	void ShaderAstValueCategory::Visit(ShaderNodes::IntrinsicCall& node)
+	{
+		m_expressionCategory = ShaderNodes::ExpressionCategory::RValue;
+	}
+
+	void ShaderAstValueCategory::Visit(ShaderNodes::Sample2D& node)
+	{
+		m_expressionCategory = ShaderNodes::ExpressionCategory::RValue;
+	}
+
+	void ShaderAstValueCategory::Visit(ShaderNodes::SwizzleOp& node)
+	{
+		Visit(node.expression);
+	}
+}