Unity Tooltip drawer for Material properties using reflection

TooltipDrawer.cs

// --------------------------------------------------------------------------------------------------------------------
// <copyright file="TooltipDrawer.cs" company="Supyrb">
//   Copyright (c) 2018 Supyrb. All rights reserved.
// </copyright>
// <author>
//   Johannes Deml
//   send@johannesdeml.com
// </author>
// --------------------------------------------------------------------------------------------------------------------

using System;
using System.Reflection;
using UnityEditor;
using UnityEngine;

namespace Supyrb
{
	/// <summary>
	/// Draws a tooltip for material properties. <see cref="TooltipAttribute"/>
	/// Usage: [Tooltip(Write your tooltip here without quotes)] _Color("Albedo", Color) = (1,1,1,1))
	/// </summary>
	public class TooltipDrawer : MaterialPropertyDrawer
	{
		private GUIContent guiContent;

		private MethodInfo internalMethod;
		private Type[] methodArgumentTypes;
		private object[] methodArguments;

		public TooltipDrawer(string tooltip)
		{
			this.guiContent = new GUIContent(string.Empty, tooltip);

			methodArgumentTypes = new[] {typeof(Rect), typeof(MaterialProperty), typeof(GUIContent)};
			methodArguments = new object[3];
			
			internalMethod = typeof(MaterialEditor)
				.GetMethod("DefaultShaderPropertyInternal", BindingFlags.Instance | BindingFlags.NonPublic, 
				null, 
				methodArgumentTypes, 
				null);
		}

		public override void OnGUI(Rect position, MaterialProperty prop, String label, MaterialEditor editor)
		{
			guiContent.text = label;
				
			if (internalMethod != null)
			{
				methodArguments[0] = position;
				methodArguments[1] = prop;
				methodArguments[2] = guiContent;
				
				internalMethod.Invoke(editor, methodArguments);
			}
		}
	}
}

Nice solution. Are you planning on adding a permissive license?

Hey there! You can find the script (and some more) over here: https://github.com/supyrb/ConfigurableShaders/tree/master/Scripts/Editor
The license of this repo is already MIT. I hope that helps :)

Thank you :^)