Shader "MY/ColourCastCutout" {
	Properties{
	 _Color("Main Color", Color) = (1,1,1,1)
	 _Bright("Bright", Float) = 1
	 _Cutoff("Alpha cutoff", Range(0,1)) = 0.5
	 _MainTex("Base (RGB)", 2D) = "white" { }

	[Toggle] _CastColor("ColorCast?", Float) = 0
	 _ColourTex("ColourTex (RGB)", 2D) = "white" { }
	 _CastColorR("CastColorR", Color) = (1,1,1,1)
	 _CastColorG("CastColorG", Color) = (1,1,1,1)
	 _CastColorB("CastColorB", Color) = (1,1,1,1)
	 _CastColorA("CastColorA", Color) = (1,1,1,1)
	[Enum(UnityEngine.Rendering.CullMode)]  _Cull("Cull Mode", Float) = 2
	}
		SubShader{
		Tags { "QUEUE" = "Geometry" "RenderType" = "Opaque" }
		LOD 200

		Cull[_Cull]

		Blend SrcAlpha OneMinusSrcAlpha

		Pass {
			CGPROGRAM
				#pragma vertex vert
				#pragma fragment frag
				#pragma target 2.0
			//#pragma multi_compile_fog
			#pragma multi_compile __ _CASTCOLOR_ON

			#include "UnityCG.cginc"

		struct v2f {
			float4 vertex : SV_POSITION;
			float2 texcoord : TEXCOORD0;

			//UNITY_FOG_COORDS(1)
			//UNITY_VERTEX_OUTPUT_STEREO
		};

		sampler2D _MainTex;
		half4 _MainTex_ST;
		half4 _Color;

		half _Bright;

		half _Cutoff;

#ifdef _CASTCOLOR_ON
			sampler2D _ColourTex;
			//float4 _ColourTex_ST;
			half4 _CastColorR;
			half4 _CastColorG;
			half4 _CastColorB;
			half4 _CastColorA;
#endif

			v2f vert(appdata_base v)
			{
				v2f o;
				UNITY_SETUP_INSTANCE_ID(v);
				//UNITY_INITIALIZE_VERTEX_OUTPUT_STEREO(o);
				o.vertex = UnityObjectToClipPos(v.vertex);
				o.texcoord = TRANSFORM_TEX(v.texcoord, _MainTex);
				//UNITY_TRANSFER_FOG(o, o.vertex);
				return o;
			}

			half3 mix(half3 x, half3 y, half a)
			{
				return x * (1 - a) + y * a;
			}

			fixed4 frag(v2f i) : SV_Target
			{
				half4 main = tex2D(_MainTex, i.texcoord);
				clip(main.a - _Cutoff);

				half3 cc = main.rgb;
#ifdef _CASTCOLOR_ON
				half4 mask = tex2D(_ColourTex, i.texcoord);
				half gray = Luminance(main.rgb);
				//half3 gray = main.rgb;

				cc = mix(cc.rgb, (_CastColorR.rgb*(gray*_CastColorR.a)), mask.r);
				cc = mix(cc.rgb, (_CastColorG.rgb*(gray*_CastColorG.a)), mask.g);
				cc = mix(cc.rgb, (_CastColorB.rgb*(gray*_CastColorB.a)), mask.b);
				cc = mix(cc.rgb, (_CastColorA.rgb*(gray*_CastColorA.a)), 1 - mask.a);
#endif
				half4 col;
				col.rgb = cc * _Color.rgb * (1.0 + 0.25 *  _Bright);
				col.a = main.a * _Color.a;
				//UNITY_APPLY_FOG(i.fogCoord, col);
				return col;
			}
		ENDCG
		}
	 }
		 Fallback "Unlit/Transparent Cutout"
}