JS1k: The JavaScript code golfing competition

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// Zolmeister
// https://zolmeister.com


// magic numbers are WebGL constants
// init borrowed from http://js1k.com/2017-magic/demo/2851
for(i in g)g[i[0]+i[6]]=g[i];

with(g) {
P = cP()

// Shaders compressed via https://github.com/stackgl/glsl-min-stream
sS(A = cS(FN+1), `
attribute vec4 P;
void main() {
  gl_Position = P;
}`)
ce(A)
aS(P, A)

// note: RegPack broke on the shader string, fell back to JSCrush
// http://www.iteral.com/jscrush/ https://siorki.github.io/regPack.html
sS(A = cS(FN), `
precision highp float;

uniform float T; // time
uniform vec2 R; // resolution
uniform vec4 S; // ring coords
uniform vec4 O; // ring spawn time

// // calculates 1/distance between a circle and a point
// // 1/x means value drops off more quickly the further you get
// float circle(vec2 px, float radius, vec2 center) {
//   return 1. / abs(distance(px, center) - radius) * .01;
// }

void main() {
  vec2 P = gl_FragCoord.xy;
	vec2 px = P / R - .5; // normalize (-0.5,0.5)
	px.x *= R.x/R.y; // adjust for aspect ratio
  float res = .0; // brightness of the pixel (0.0-1.0)

  // rings
  for (int i = 0; i < 4; ++i) {
    float r = O[i] < 1. ? .03 : (T - O[i])/999. + .03;
    float centerX = mod(S[i], 1.) * .8 - .4;
    float centerY = mod(S[i] * 9., 1.)*.8 - .4;

    // 0 bounces
    // note circle() has been inlined here for better compression
    res += 1. / abs(distance(px, vec2(centerX, centerY)) - r)* .007;
    // 1 bounce
    res += 1. / abs(distance(px, vec2(-centerX + R.x/R.y, centerY)) - r)* .007;
    res += 1. / abs(distance(px, vec2(-centerX - R.x/R.y, centerY)) - r)* .007;
    res += 1. / abs(distance(px, vec2(centerX, 1. - centerY)) - r)* .007;
    res += 1. / abs(distance(px, vec2(centerX, -1. - centerY)) - r)* .007;
  }

  // Julia Fractal c = (0, .7)
  for (int i = 0; i < 99; i++) {
    px = vec2(
  		px.x * px.x - px.y * px.y,
  		px.x * px.y * 2. + .7 + .001 * sin(T/999.)
  	);
    if (dot(px, px) > 4.) {
      res +=  float(i) / 99.;
      break;
    }
  }

	gl_FragColor = vec4(
    vec3(26.,99.*sin(T/999.),99.)/255. * res +
    // Iestyn's RGB dither (Valve)
    fract(
      vec3(dot(vec2(171., 231.), P)) / vec3(99., 71., 97.)
    ) / 255.
  ,1.);
}`)
ce(A)
aS(P, A)

lo(P)
ug(P)

vA(i = playSound = 0, 2, 5120,
  bf(34962, cB(eV(0))),
  1,
  bD(34962, Int8Array.of(-1,1,1,-1,-1), 35044)
)

ringCoords = [2,2,2,2]
ringTime = [2,2,2,2]
audio = new AudioContext()
oss = audio.createOscillator()

// ES6 features manually added after closure-compiler pass
spawn = function () {
  ringCoords[i] = ringTime[i] = Math.random()
  playSound = 1
}

oss.connect(v.destination)
oss.start()

;(s=t=> {
  uniform1f(gf(P, 'T'), t)
  uniform2f(gf(P, 'R'), innerWidth, innerHeight)
  // 'g.' otherwise error
  g.uniform4f(gf(P, 'S'), ...ringCoords)
  g.uniform4f(gf(P, 'O'), ...ringTime)

  onmousedown = f =>
    ringTime[i=++i%4] > 1 ? spawn() : ringTime[i] = t

  // 'this.dump' detects Firefox because of artifacting
  oss.frequency.value = 261 * playSound * !this.dump

  dr(6,playSound=0,4);
  requestAnimationFrame(s)
})()

}