using System;
using UnityEngine;

namespace UnityEditor.Graphs.Material
{
	class SimpleSpecularFunction : BaseLightFunction
	{
		public override string GetName () { return "SimpleSpecular"; }
		public override void GenerateBody(ShaderGenerator visitor)
		{
			var outputString = new ShaderGenerator ();
			outputString.AddShaderChunk ("half4 Lighting" + GetName () + " (SurfaceOutput s, half3 lightDir, half3 viewDir, half atten)", false);
			outputString.AddShaderChunk ("{", false);
			outputString.Indent ();
			outputString.AddShaderChunk ("half3 h = normalize (lightDir + viewDir);", false);
			outputString.AddShaderChunk ("half diff = max (0, dot (s.Normal, lightDir));", false);
			outputString.AddShaderChunk ("half nh = max (0, dot (s.Normal, h));", false);
			outputString.AddShaderChunk ("half spec = pow (nh, 48.0);", false);
			outputString.AddShaderChunk ("half4 c; c.rgb = (s.Albedo * _LightColor0.rgb * diff + _LightColor0.rgb * spec) * (atten * 2);", false);
			outputString.AddShaderChunk ("c.a = s.Alpha;", false);
			outputString.AddShaderChunk ("return c;", false);
			outputString.Deindent ();
			outputString.AddShaderChunk ("}", false);

			visitor.AddShaderChunk (outputString.GetShaderString (0), true);
		}
	}
}