Shader: Add initial support for options (WIP)

src/Nazara/Shader/Ast/Nodes.cpp

@@ -29,4 +29,35 @@ namespace Nz::ShaderAst
 	}
 
 #include <Nazara/Shader/Ast/AstNodeList.hpp>
+
+	ExpressionType ConstantExpression::GetExpressionType() const
+	{
+		return std::visit([&](auto&& arg) -> ShaderAst::ExpressionType
+		{
+			using T = std::decay_t<decltype(arg)>;
+
+			if constexpr (std::is_same_v<T, bool>)
+				return PrimitiveType::Boolean;
+			else if constexpr (std::is_same_v<T, float>)
+				return PrimitiveType::Float32;
+			else if constexpr (std::is_same_v<T, Int32>)
+				return PrimitiveType::Int32;
+			else if constexpr (std::is_same_v<T, UInt32>)
+				return PrimitiveType::UInt32;
+			else if constexpr (std::is_same_v<T, Vector2f>)
+				return VectorType{ 2, PrimitiveType::Float32 };
+			else if constexpr (std::is_same_v<T, Vector3f>)
+				return VectorType{ 3, PrimitiveType::Float32 };
+			else if constexpr (std::is_same_v<T, Vector4f>)
+				return VectorType{ 4, PrimitiveType::Float32 };
+			else if constexpr (std::is_same_v<T, Vector2i32>)
+				return VectorType{ 2, PrimitiveType::Int32 };
+			else if constexpr (std::is_same_v<T, Vector3i32>)
+				return VectorType{ 3, PrimitiveType::Int32 };
+			else if constexpr (std::is_same_v<T, Vector4i32>)
+				return VectorType{ 4, PrimitiveType::Int32 };
+			else
+				static_assert(AlwaysFalse<T>::value, "non-exhaustive visitor");
+		}, value);
+	}
 }