Initial commit

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

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+Shader "Hidden/TerrainTools/Noise/Preview"
+{
+    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
+        float  _Layer;
+        
+        struct appdata_t
+        {
+            float4 vertex : POSITION;
+            float2 uv : TEXCOORD0;
+        };
+
+        struct v2f
+        {
+            float4 vertex : SV_POSITION;
+            float2 uv : TEXCOORD0;
+        };
+
+        inline float4 remap( float4 n, float o, float p, float a, float b )
+        {
+            return a.xxxx + (b.xxxx - a.xxxx) * (n - o.xxxx) / (p.xxxx - o.xxxx);
+        }
+
+        v2f vert( appdata_t v )
+        {
+            v2f o;
+            
+            o.vertex = UnityObjectToClipPos( v.vertex );
+            o.uv = v.uv;
+
+            return o;
+        }
+
+        ENDHLSL
+
+        Pass
+        {
+            Name "Noise Preview (2D)"
+
+            HLSLPROGRAM
+
+            #pragma vertex vert
+            #pragma fragment frag
+
+            float4 frag( v2f i ) : SV_Target
+            {
+                float r = tex2D(_MainTex, i.uv).r;
+
+                // r = remap( r.xxxx, 0, 1, -4, 5 );
+
+                float4 color = lerp( float4( 0, abs( r ), abs( r ), 1 ), float4( r.xxx, 1 ), max( sign( r ), 0 ) );
+
+                // color the out of range values
+                color = lerp( color, float4( r - .9, 0, 0, 1 ), max( sign( r - 1 ), 0 ) );   // if over 1
+
+                return color;
+            }
+
+            ENDHLSL
+        }
+
+        Pass
+        {
+            Name "Noise Preview (3D)"
+
+            HLSLPROGRAM
+
+            #pragma vertex vert
+            #pragma fragment frag
+
+            float4 frag( v2f i ) : SV_Target
+            {
+                float r = tex2D(_MainTex, i.uv).r;
+
+                return lerp( float4( 0, abs( r ), abs( r ), 1 ), float4( r.xxx, 1 ), max( sign( r ), 0 ) );
+            }
+
+            ENDHLSL
+        }
+    }
+}