function mix32(value) {
  let mixed = value >>> 0;
  mixed ^= mixed >>> 16;
  mixed = Math.imul(mixed, 0x7feb352d);
  mixed ^= mixed >>> 15;
  mixed = Math.imul(mixed, 0x846ca68b);
  mixed ^= mixed >>> 16;
  return mixed >>> 0;
}

export function hashString(value) {
  let hash = 2166136261;
  for (let index = 0; index < value.length; index += 1) {
    hash ^= value.charCodeAt(index);
    hash = Math.imul(hash, 16777619);
  }
  return hash >>> 0;
}

export function whiteNoiseAt(seed, sampleIndex) {
  const mixed = mix32((seed >>> 0) ^ Math.imul(sampleIndex + 1, 0x9e3779b1));
  return (mixed / 0xffffffff) * 2 - 1;
}

export function pinkNoiseAt(seed, sampleIndex) {
  let total = 0;
  let weight = 0;
  for (let octave = 0; octave < 8; octave += 1) {
    const octaveWeight = 1 / (octave + 1);
    total += whiteNoiseAt(seed + octave * 0x1f123bb5, sampleIndex >> octave) * octaveWeight;
    weight += octaveWeight;
  }
  return total / weight;
}