Init

Assets/AmplifyShaderEditor/Plugins/EditorResources/Previews/Preview_RGBToHSVNode.shader

@@ -0,0 +1,38 @@
+Shader "Hidden/RGBToHSVNode"
+{
+	Properties
+	{
+		_A ( "_RGB",  2D ) = "white" {}
+	}
+
+	SubShader
+	{
+		Pass
+		{
+			CGPROGRAM
+			#include "UnityCG.cginc"
+			#include "Preview.cginc"
+			#pragma vertex vert_img
+			#pragma fragment frag
+
+			uniform sampler2D _A;
+
+			float3 RGBToHSV(float3 c)
+			{
+				float4 K = float4(0.0, -1.0 / 3.0, 2.0 / 3.0, -1.0);
+				float4 p = lerp( float4( c.bg, K.wz ), float4( c.gb, K.xy ), step( c.b, c.g ) );
+				float4 q = lerp( float4( p.xyw, c.r ), float4( c.r, p.yzx ), step( p.x, c.r ) );
+				float d = q.x - min( q.w, q.y );
+				float e = 1.0e-10;
+				return float3( abs(q.z + (q.w - q.y) / (6.0 * d + e)), d / (q.x + e), q.x);
+			}
+
+			float4 frag ( v2f_img i ) : SV_Target
+			{
+				float3 rgb = tex2D ( _A, i.uv ).rgb;
+				return float4( RGBToHSV(rgb), 1 );
+			}
+			ENDCG
+		}
+	}
+}