Initial commit

Assets/Procedural Worlds/Gaia/Shaders/Unity/Terrain Tools/NoiseLib/NoisePreview.shader

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+Shader "Hidden/TerrainTools/NoiseLib/DefaultPreview"
+{
+    Properties { _MainTex ("Texture", any) = "" {} }
+
+    SubShader
+    {
+        ZTest Always Cull OFF ZWrite Off
+
+        HLSLINCLUDE
+
+        #include "UnityCG.cginc"
+
+        sampler2D _MainTex;
+        float4 _MainTex_TexelSize;      // 1/width, 1/height, width, height
+        
+        struct appdata_t
+        {
+            float4 vertex : POSITION;
+            float2 uv : TEXCOORD0;
+        };
+
+        struct v2f
+        {
+            float4 vertex : SV_POSITION;
+            float2 uv : TEXCOORD0;
+        };
+
+        v2f vert( appdata_t v )
+        {
+            v2f o;
+            o.vertex = UnityObjectToClipPos( v.vertex );
+            o.uv = v.uv;
+            return o;
+        }
+
+        ENDHLSL
+
+        Pass // 1
+        {
+            Name "Noise Preview"
+
+            HLSLPROGRAM
+
+            #pragma vertex vert
+            #pragma fragment frag
+
+            float4 frag( v2f i ) : SV_Target
+            {
+                float noiseVal = tex2D(_MainTex, i.uv);
+
+                // display negative areas as a separate color
+                float4 negativeColor = float4( 0, abs( noiseVal.x ), abs( noiseVal.x ), 1 );
+                float4 positiveColor = float4( noiseVal.xxx, 1 );
+                float t = max( sign( noiseVal.x ), 0 );
+
+                return lerp( negativeColor, positiveColor, t );
+            }
+
+            ENDHLSL
+        }
+    }
+}