Index / Lessons / Boot & render

Chapter 2 of 9

Boot & render

Rendering sets graph roots and sends a batch to the plugin. The first emit is easy to lose on navigation — plan for retries.

render + didEmit

function ensureEmit() {
  if (wax.didEmit()) return true;
  if (typeof wax.reemitLast === "function") wax.reemitLast("retry");
  return wax.didEmit();
}

function renderGraph() {
  const tone = wax.mul(wax.cycle(440), 0.15);
  wax.render(tone, tone);
  ensureEmit();
}

Poke schedule

After boot, re-run renderGraph() on a short delay ladder so Project URL loads and WebView lifecycle do not swallow the first batch:

function poke() {
  WaxNative.keepAlive();
  renderGraph();
  if (!wax.didEmit()) setTimeout(() => { renderGraph(); ensureEmit(); }, 40);
}
[50, 150, 400, 800, 1500, 2500, 4000].forEach((ms) => setTimeout(poke, ms));

Do not

• Call render() once at the bottom of a synchronous inline script with no deferred poke.
• Pass onBatch / custom emit to create() unless you emit yourself — didEmit() will stay false.
• Hand-roll JUCE emit chains copied from internal bridge code.

Try it

Full page: Minimal tone demo

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