Function createRollingStat

examples/million-points/main.ts:168–195

(windowSize: number)

 * Circular buffer avoids allocations during benchmark.
 */
const createRollingStat = (windowSize: number): RollingStat => {
  const buf = new Float64Array(Math.max(1, windowSize | 0));
  let idx = 0;
  let count = 0;
  let sum = 0;

  return {
    push(value) {
      const v = Number.isFinite(value) ? value : 0;
      if (count < buf.length) {
        buf[idx] = v;
        sum += v;
        count++;
        idx = (idx + 1) % buf.length;
        return;
      }

      const prev = buf[idx]!;
      buf[idx] = v;
      sum += v - prev;
      idx = (idx + 1) % buf.length;
    },
    mean() {
      if (count === 0) return 0;
      return sum / count;
    },
  };
};

/**
 * Main setup: initializes GPUContext, createRenderCoordinator (low-level API),