Shader "Carmen/Decal"
{
	Properties
	{
		_MainTex ("Decal", 2D) = "white" {}
		_Colour ("Colour", Color) = (1.0, 1.0, 1.0, 1.0)
		_Metallic ("Metallic", Range(0.0, 1.0)) = 0.0
		_Smoothness ("Smoothness", Range(0.0, 1.0)) = 0.0

		[NoScaleOffset] _DetailTex ("Detail Albedo", 2D) = "grey" {}
		_DetailNormal ("Detail Normal", 2D) = "bump" {}
	}
	SubShader
	{
		Tags { "Queue"="Overlay" "RenderType"="Fade" "CanUseSpriteAtlas"="True" }
		LOD 200

		Cull Back
		Blend SrcAlpha OneMinusSrcAlpha
		Offset -1, -1

		CGPROGRAM
		#include "UnityCG.cginc"
		#pragma target 4.5
		#pragma surface surf Standard alpha:fade
		

		struct Input
		{
			float2 uv_MainTex;
			float2 uv_DetailTex;
			float2 uv_DetailNormal;
		};


		UNITY_DECLARE_TEX2D(_MainTex);
		half4 _Colour;
		half _Metallic;
		half _Smoothness;

		UNITY_DECLARE_TEX2D(_DetailTex);
		UNITY_DECLARE_TEX2D(_DetailNormal);


		void surf (Input IN, inout SurfaceOutputStandard o)
		{
			half4 TexSample = UNITY_SAMPLE_TEX2D(_MainTex, IN.uv_MainTex);

			o.Albedo = TexSample.rgb;
			//o.Albedo *= UNITY_SAMPLE_TEX2D(_DetailTex, IN.uv_DetailNormal).rgb * 2.0;
			o.Albedo *= _Colour;

			o.Alpha = TexSample.a * _Colour.a;

			o.Metallic = _Metallic;
			o.Smoothness = _Smoothness;

			o.Normal = UnpackNormal(UNITY_SAMPLE_TEX2D(_DetailNormal, IN.uv_DetailNormal));
		}
		ENDCG
	}
	FallBack "Diffuse"
}