show some love to hyper

Assets/Scenes/GFLPC_Julia/NtrMandelbrot.shader

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+Shader "Kaiju/NtrJulia"
+{
+    Properties
+    {
+        _MainTex ("Texture", 2D) = "white" {}
+        // first two numbers are center of area, second two - size of area
+        _Area("Area", vector) = (0, 0, 4 ,4)
+        _Angle("Angle", range(-3.1415, 3.1415)) = 0
+        _MaxIter("Max Iterations", range(0, 555)) = 255
+        // _Speed("Speed", range(0, 1)) = 0.1
+        _Colors("Colors", vector) = (0.5, 0.5, 0.5, 0.0)
+        _EscapeRadius("EscapeRadius", range(2, 2000)) = 255
+
+        _SpectrumTexture("SpectrumTexture", 2D) = "white" {}
+        _ThemeTexture("ThemeTexture", 2D) = "white" {}
+        _SpectrumSize("SpectrumSize", float) = 16
+
+    }
+    SubShader
+    {
+        // No culling or depth
+        Cull Off ZWrite Off ZTest Always
+
+        Pass
+        {
+            CGPROGRAM
+            #pragma vertex vert
+            #pragma fragment frag
+
+            #include "UnityCG.cginc"
+
+            struct appdata
+            {
+                float4 vertex : POSITION;
+                float2 uv : TEXCOORD0;
+            };
+
+            struct v2f
+            {
+                float2 uv : TEXCOORD0;
+                float4 vertex : SV_POSITION;
+            };
+
+            v2f vert (appdata v)
+            {
+                v2f o;
+                o.vertex = UnityObjectToClipPos(v.vertex);
+                o.uv = v.uv;
+                return o;
+            }
+
+            float4 _Area;
+            float _Angle;
+            float _Speed;
+            float _Symmetry;
+            float _EscapeRadius;
+            int _MaxIter;
+            sampler2D _MainTex;
+            sampler2D _SpectrumTexture;
+            sampler2D _ThemeTexture;
+            int _SpectrumSize;
+
+            fixed4 frag (v2f i) : SV_Target {
+                // float2 uv = i.uv - 0.5;
+                // float2 offset = _Area.xy + uv * _Area.zw;
+                // float r = _EscapeRadius;
+                // float r2 = r*r;
+
+                // float2 c = _Area.xy + uv * _Area.zw;
+
+                float2 uv = i.uv - 0.5;
+                uv = abs(uv);
+                uv = lerp(i.uv - 0.5, uv, _Symmetry);
+                float2 c = _Area.xy + uv * _Area.zw;
+
+                // cool modulation
+                float time = _Time.y;
+                float sub = tex2D(_SpectrumTexture, 0.0);
+                float bass = tex2D(_SpectrumTexture, 0.25);
+                float mids = tex2D(_SpectrumTexture, 0.50);
+                float highs = tex2D(_SpectrumTexture, 0.75);
+
+                // float r = lerp(2.0, 200, bass);
+                float maxIterations = lerp(5.0, 200, bass);
+                // float speed = sub * -scale;
+
+                // float maxIterations = _MaxIter;
+                float r = _EscapeRadius;
+                float speed = _Speed;
+
+                float2 z = 0;
+                float2 zNext;
+                int iter;
+                for (iter = 0; iter < maxIterations; iter ++)
+                {
+                    // f(z) = z^2 + c
+                    zNext.x = z.x * z.x - z.y * z.y   + c.x;
+                    zNext.y = 2 * z.x * z.y           + c.y;
+                    z = zNext;
+
+                    // escaping?
+                    if (distance(z, float2(0,0)) > r)
+                        break;
+                }
+
+                if (iter >= maxIterations) {
+                    return 0;
+                }
+
+
+                float val = iter / float(maxIterations);
+                float band = (float(iter) % _SpectrumSize) / _SpectrumSize;
+
+                float smooth = (float(iter) - (log(log(sqrt(z.x * z.x + z.y * z.y))) / log(2.0))) / float(maxIterations);
+
+                // // distance
+                // float dist  = length(z); // distance from origin
+                // // d(c) = |Z|·log|Z|/|Z'|
+                // float d = 0.5*sqrt(dot(z,z)/dot(zNext,zNext))*log(dot(z,z));
+                // return d;
+
+                float4 col = tex2D(_ThemeTexture, smooth * highs);
+                return col;
+                // return float4(sin(val), sin(val), sin(val), 1);
+
+                // float dist  = length(z); // distance from origin
+                // float fracIter  = (dist - r) / (r2 - r); // linear interpolation
+                // fracIter = log2(log(dist) / log(r) ); // double exponential interpolation
+                // iter -= fracIter;
+                // float m = sqrt(iter / _MaxIter);
+                // float4 col = sin(float4(.3, .45, .65, 1) * m * 20)*.5 + .5; // procedural colors
+                // col = tex2D(_MainTex, float2(m * _Repeat + _Time.y*_Speed, _Color));
+                // col *= smoothstep(3, 0, fracIter);
+                // float angle = atan2(z.x, z.y);
+                // col *= 1 + sin(angle*2 + _Time.y*4)*.2;
+                // return col;
+            }
+            ENDCG
+        }
+    }
+}