ECM2

Assets/RapidIcon/Shaders/PostProcessing/Mask.shader

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+Shader "RapidIcon/PostProcessing/Mask" {
+	Properties{
+		[NoScaleOffset]
+		[MainTexture]
+		_MainTex("Tex", 2D) = "black" {}
+
+		[NoScaleOffset]
+		_MaskTex("Mask", 2D) = "white" {}
+
+		[Toggle]
+		_UseLuminance("Use Luminance", Int) = 1
+	}
+		SubShader
+		{
+			Tags {  "Queue" = "Transparent" "RenderType" = "Transparent" }
+			Blend One OneMinusSrcAlpha
+			Pass
+			{
+				CGPROGRAM
+				#pragma vertex vert_img
+				#pragma fragment frag
+				#include "UnityCG.cginc"
+
+				struct appdata
+				{
+					float4 vertex : POSITION;
+					float2 uv : TEXCOORD0;
+				};
+
+				struct v2f
+				{
+					float2 uv : TEXCOORD0;
+					float4 vertex : SV_POSITION;
+				};
+
+				sampler2D _MainTex;
+				sampler2D _MaskTex;
+				int _UseLuminance;
+
+				fixed4 frag(v2f_img i) : SV_Target
+				{
+					fixed4 col = tex2D(_MainTex, i.uv);
+
+					fixed3 maskCol = tex2D(_MaskTex, i.uv).rgb;
+					if (_UseLuminance == 1)
+					{
+						fixed maskLum = Luminance(maskCol).r;
+						col *= maskLum;
+					}
+					else 
+					{
+						fixed maskLum = maskCol.r;
+						col *= maskLum;
+					}				
+					
+					return col;
+
+				}
+				ENDCG
+			}
+		}
+			FallBack "Diffuse"
+}