1 files changed, 62 insertions, 0 deletions
diff --git a/Assets/ThirdParty/AmplifyShaderEditor/Plugins/EditorResources/Previews/Preview_GrayscaleNode.shader b/Assets/ThirdParty/AmplifyShaderEditor/Plugins/EditorResources/Previews/Preview_GrayscaleNode.shader
new file mode 100644
index 00000000..2f604607
--- /dev/null
+++ b/Assets/ThirdParty/AmplifyShaderEditor/Plugins/EditorResources/Previews/Preview_GrayscaleNode.shader
@@ -0,0 +1,62 @@
+Shader "Hidden/GrayscaleNode"
+{
+	Properties
+	{
+		_A ("_RGB", 2D) = "white" {}
+	}
+	SubShader
+	{
+		Pass //Luminance
+		{
+			CGPROGRAM
+			#include "UnityCG.cginc"
+			#pragma vertex vert_img
+			#pragma fragment frag
+
+			sampler2D _A;
+			
+			float4 frag(v2f_img i) : SV_Target
+			{
+				float lum = Luminance( tex2D( _A, i.uv ) );
+				return float4( lum.xxx, 1);
+			}
+			ENDCG
+		}
+
+		Pass //Natural Classic
+		{
+			CGPROGRAM
+			#include "UnityCG.cginc"
+			#pragma vertex vert_img
+			#pragma fragment frag
+
+			sampler2D _A;
+
+			float4 frag ( v2f_img i ) : SV_Target
+			{
+				float lum = dot ( tex2D ( _A, i.uv ), float3( 0.299,0.587,0.114 ) ); 
+				return float4( lum.xxx, 1 );
+			}
+			ENDCG
+		}
+
+		Pass //Old School
+		{
+			CGPROGRAM
+			#include "UnityCG.cginc"
+			#pragma vertex vert_img
+			#pragma fragment frag
+
+			sampler2D _A;
+
+			float4 frag ( v2f_img i ) : SV_Target
+			{
+				float3 rgbValue = tex2D ( _A, i.uv ).rgb;
+				float lum = ( rgbValue.r + rgbValue.g + rgbValue.b ) / 3;
+				return float4( lum.xxx, 1 );
+			}
+			ENDCG
+		}
+
+	}
+}