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   curved-ruler (curved_ruler@mastodon.gamedev.place)'s status on Wednesday, 01-Nov-2023 03:00:30 JST curved-ruler

   in reply to

   vec3 col(in float x, in float y)
   {
   vec2 z = vec2(x,y);
   int i = 0;
   int n = 64;
   for (i=0 ; i<n ; ++i)
   {
   vec2 z5 = cmul(z,cmul(z,cmul(z,cmul(z,cmul(z,z)))));
   vec2 a = (z5-vec2(pow(0.3976,2.0), 0.0));
   vec2 b = (z5+vec2(pow(0.7638,2.0), 0.0));
   vec2 c = (z5+vec2(pow(0.6625,2.0), 0.0));
   z = 0.72*cdiv(a,cdiv(b,cdiv(c,z)));
   if (length(z) > 100.0) break;
   }
   float t = fract(float(i) / float(n)*16.0);
   return hsv2rgb(vec3(0.1, 0.9, t));
   }