* amplify shader editor

1 files changed, 39 insertions, 0 deletions

diff --git a/Assets/AmplifyShaderEditor/Plugins/EditorResources/Previews/Preview_SimpleContrastNode.shader b/Assets/AmplifyShaderEditor/Plugins/EditorResources/Previews/Preview_SimpleContrastNode.shader
new file mode 100644
index 00000000..96fa3b1b
--- /dev/null
+++ b/Assets/AmplifyShaderEditor/Plugins/EditorResources/Previews/Preview_SimpleContrastNode.shader
@@ -0,0 +1,39 @@
+Shader "Hidden/SimpleContrastNode"
+{
+	Properties
+	{
+		_A ( "_RBG",  2D ) = "white" {}
+		_B ( "_Fraction",  2D ) = "white" {}
+	}
+
+	SubShader
+	{
+		Pass
+		{
+			CGPROGRAM
+			#include "UnityCG.cginc"
+			#pragma vertex vert_img
+			#pragma fragment frag
+
+			uniform sampler2D _A;
+			uniform sampler2D _B;
+			
+			float4 CalculateContrast ( float contrastValue, float4 colorTarget )
+			{
+				float t = 0.5 * ( 1.0 - contrastValue );
+				return mul ( float4x4( contrastValue, 0, 0, t, 0, contrastValue, 0, t, 0, 0, contrastValue, t, 0, 0, 0, 1 ), colorTarget );
+			}
+
+			float4 frag ( v2f_img i ) : SV_Target
+			{
+				float4 rgba = tex2D ( _B, i.uv );
+				float value = tex2D ( _A, i.uv ).r;
+
+				float4 finalColor = CalculateContrast( value , rgba );
+				
+				return finalColor;
+			}
+			ENDCG
+		}
+	}
+}