const { instance } = await WebAssembly.instantiateStreaming(fetch("beep.wasm"));

let ctx = undefined;

const count = 44100;
const ptr = instance.exports.get_samples();

async function playTone(frequency = 440) {
  ctx ??= new AudioContext();
  await ctx.resume();

  instance.exports.beep(ctx.sampleRate, frequency);
  const audioBuffer = ctx.createBuffer(1, count, ctx.sampleRate);
  const audioChannel = audioBuffer.getChannelData(0);
  audioChannel.set(new Float32Array(instance.exports.memory.buffer, ptr, count));

  const src = ctx.createBufferSource();
  src.buffer = audioBuffer;
  src.connect(ctx.destination);
  src.start();
}

window.addEventListener("click", () => playTone(440));