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3d Prototyp/Assets/AssetPacks/Barrier Pack/Shaders/Contrast Stretch/Luminance.shader

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+// Outputs luminance (grayscale) of the input image _MainTex
+
+Shader "Hidden/Contrast Stretch Luminance" {
+	
+Properties {
+	_MainTex ("Base (RGB)", 2D) = "white" {}
+}
+
+Category {
+	SubShader {
+		Pass {
+			ZTest Always Cull Off ZWrite Off
+				
+CGPROGRAM
+#pragma vertex vert_img
+#pragma fragment frag
+#include "UnityCG.cginc"
+
+uniform sampler2D _MainTex;
+
+float4 frag (v2f_img i) : SV_Target
+{
+	float4 col = tex2D(_MainTex, i.uv);
+	col.rgb = Luminance(col.rgb) * (1+col.a*2);
+	return col;
+}
+ENDCG
+
+		}
+	}
+}
+
+Fallback off
+
+}