// simTick: one simulation step, in order.
// ---------- Main tick ----------
function simTick() {
  tick++;
  tickStamp = (tickStamp % 255) + 1;
  if (loadWakeOrder) loadWakeTick();
  if (tick % 20 === 1) updateDirtyRoof();
  weatherTick();
  machinesTick();
  pipesTick();
  pulseTick();
  entTick();
  if (flyers.length) flyTick();
  if (tick % 8 === 0) wakeBotPowder();
  simMove();
  heatPass();
  if (flowOn) flowTick();
  for (let c = 0; c < NCH; c++) if (awake[c]) awake[c]--;
  if (tick % 15 === 0) checkMolds();
  if (tick % 30 === 0) checkLedger();
  if (tick % 60 === 7) plantTick();
  if (tick % 120 === 13) coldTick();
  if (tick % 20 === 9 && treeBases.length) treeSupportTick();
  dockTick();
  if (tick % 60 === 17) { marketTick(); ordersTick(); }
  if (tick % 30 === 11 && saplings.length) saplingTick();
  ghostTick();
  if (tick % 4 === 0) fogLook(bot.x + bot.w / 2, bot.y + bot.h / 2);
}