Function tick

packages/node/src/worker/engineWorker.ts:291–539

()

}

function tick(): void {
  if (!runtimeState.running) return;
  if (runtimeState.engineId === null) return;

  let didSubmitDrawlistThisTick = false;
  let didFrameWork = false;
  let didEventWork = false;
  let submittedFrameSeq: number | null = null;

  if (runtimeState.pendingFrame !== null) {
    const frame = runtimeState.pendingFrame;
    runtimeState.pendingFrame = null;
    emitFrameAuditNow("frame.submit.begin", frame.frameSeq, {
      transport: frame.transport,
      byteLen: frame.byteLen,
      ...(frame.transport === FRAME_TRANSPORT_SAB_V1
        ? { slotIndex: frame.slotIndex, slotToken: frame.slotToken }
        : {}),
    });
    let res = -1;
    let sabInUse = false;
    let staleSabFrame = false;
    try {
      if (frame.transport === FRAME_TRANSPORT_TRANSFER_V1) {
        const view = new Uint8Array(frame.buf, 0, frame.byteLen);
        if (frameAudit.enabled) {
          const fp = drawlistFingerprint(view);
          setFrameAuditMetaNow(frame.frameSeq, {
            transport: frame.transport,
            byteLen: frame.byteLen,
            hash32: fp.hash32,
            prefixHash32: fp.prefixHash32,
            cmdCount: fp.cmdCount,
            totalSize: fp.totalSize,
          });
          emitFrameAuditNow("frame.submit.payload", frame.frameSeq, fp);
        }
        res = native.engineSubmitDrawlist(runtimeState.engineId, view);
      } else {
        if (runtimeState.frameTransport.kind !== FRAME_TRANSPORT_SAB_V1) {
          throw new Error("SAB frame transport unavailable");
        }
        if (frame.slotIndex < 0 || frame.slotIndex >= runtimeState.frameTransport.slotCount) {
          throw new Error(`invalid SAB frame slot index: ${String(frame.slotIndex)}`);
        }
        const token = Atomics.load(runtimeState.frameTransport.tokens, frame.slotIndex);
        if (token !== frame.slotToken) {
          staleSabFrame = true;
        } else {
          const prev = Atomics.compareExchange(
            runtimeState.frameTransport.states,
            frame.slotIndex,
            FRAME_SAB_SLOT_STATE_READY,
            FRAME_SAB_SLOT_STATE_IN_USE,
          );
          if (prev !== FRAME_SAB_SLOT_STATE_READY) {
            const tokenAfter = Atomics.load(runtimeState.frameTransport.tokens, frame.slotIndex);
            if (tokenAfter !== frame.slotToken) {