SHIT key effect on VEDA

shit.frag

/*{
  IMPORTED: {
    img: { PATH: 'shit.jpg' },
  },
}*/
precision highp float;
uniform float time;
uniform vec2 resolution;
uniform sampler2D img;

void main() {
  vec2 fragCoord = gl_FragCoord.xy;
  fragCoord += vec2(sin(time * 71.), cos(time * 57.)) * 1.4;
  fragCoord = (fragCoord - resolution * .5) * (1. + sin(time * 37.3) * sin(time * 23.3) * .02) + resolution * .5;

  vec2 uv = fragCoord.xy / resolution;
  vec2 p = (fragCoord.xy *2.- resolution) / min(resolution.x, resolution.y);

  // offset
  p += vec2(.1, .2);

  float l = length(p);
  l = l * l * 4.;

  float a = atan(p.y, p.x);
  float wave = sin(a * 37.+ time * 39.) * sin(a * 171. + time * 97.) *l;

  l += wave * .1;

  vec4 c = texture2D(img, uv);

  // blur
  for (int i = 0; i < 30; i++) {
    float fi = float(i);
    vec2 uv2 = (uv - .5) * (1. - l * fi *.001) + .5;
    c += texture2D(img, uv2);
  }
  c /= 30.;

  c *= 1. + wave * .03;

  // color grading
  c = smoothstep(.05, .9, c);
  c.r = pow(c.r, .8 + l * .1);

  c *= 1. - l * l * .008;

  gl_FragColor = c;
}