Create CirclesPattern.shader

Author: unitycoder

Assets/Shaders/2D/Patterns/CirclesPattern.shader

@@ -0,0 +1,68 @@
+// draws circle pattern
+Shader "UnityLibrary/2D/Patterns/Circles"
+{
+    Properties
+    {
+        _Color ("Color", Color) = (1,1,1,1)
+        _CircleSize("Size", Range(0,1)) = 0.5
+        _Circles("Amount", Range(1,64)) = 8
+    }
+
+    SubShader
+    {
+        Tags { "RenderType"="Opaque" }
+        LOD 200
+
+        CGPROGRAM
+        #pragma surface surf Standard fullforwardshadows vertex:vert
+        #pragma target 3.0
+
+        struct Input
+        {
+            float2 texcoord : TEXCOORD0;
+        };
+
+        sampler2D _MainTex;
+        float _Circles;
+        float _CircleSize;
+
+        half _Glossiness;
+        half _Metallic;
+        fixed4 _Color;
+
+        UNITY_INSTANCING_BUFFER_START(Props)
+        UNITY_INSTANCING_BUFFER_END(Props)
+
+        // https://thebookofshaders.com/09/
+        float2 tile(float2 _st, float _zoom)
+        {
+            _st *= _zoom;
+            return frac(_st);
+        }
+
+        // https://thebookofshaders.com/07/
+        float Circle(float2 _st, float _radius)
+        {
+            float2 dist = _st - float2(0.5, 0.5);
+            return 1. - smoothstep(_radius - (_radius * 0.01), _radius + (_radius * 0.01), dot(dist, dist) * 4.0);
+        }
+
+        void vert(inout appdata_full v, out Input o) 
+        {
+            UNITY_INITIALIZE_OUTPUT(Input, o);
+            o.texcoord = v.texcoord;
+        }
+
+        void surf (Input IN, inout SurfaceOutputStandard o)
+        {
+            float2 st = IN.texcoord.xy;
+            float c = Circle(tile(st, round(_Circles)), _CircleSize);
+            o.Albedo = c.rrr* _Color;
+            o.Metallic = _Metallic;
+            o.Smoothness = _Glossiness;
+            o.Alpha = c.r;
+        }
+        ENDCG
+    }
+    FallBack "Diffuse"
+}