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#include "2D.frag"

vec3 glitch(vec2 pos)
{
  if (length(pos) < 0.1)
     return fract(pos.xyy) / 0.1;
  else
    0.0;
}

vec3 color(vec2 pos)
{
  return glitch(pos);
}
Note: no return in the else branch! This invokes undefined behaviour, results are highly unpredictable, may vary on different system, may even fail to compile?  I don't know if it's legal GLSL...


Linkback: https://fractalforums.org/code-snippets-fragments/74/glitch/2333/