Torque and Motors

const renderLayers = {
  foreground: 1 << 0,
};

export const createTorqueGame = async (): Promise<Game> => {
  const { game, world, renderContext, time } = createGame('demo-game');

  createCamera(world, {
    isStatic: true,
    cullingMask: renderLayers.foreground,
    verticalWorldUnits: DEMO_VERTICAL_WORLD_UNITS,
  });

  // No gravity: these flywheels only ever spin in place, so nothing needs
  // to pull them downward.
  const physicsWorld = new PhysicsWorld({ gravity: Vector2.zero });

  const thrustInput = new HoldAction('thrust');
  const inputManager = registerInputs(world, time, {
    holdActions: [thrustInput],
  });
  const keyboardInputSource = new KeyboardInputSource(inputManager);

  keyboardInputSource.holdBindings.add(
    new KeyboardHoldBinding(thrustInput, keyCodes.space),
  );

  const { x: width, y: height } = calculateVisibleWorldSize(
    renderContext.width,
    renderContext.height,
    DEMO_VERTICAL_WORLD_UNITS,
  );
  const columnWidth = width / 2;

  await createThrusterScenario(
    world,
    renderContext,
    renderLayers.foreground,
    new Vector2(-columnWidth / 2, height * 0.1),
    thrustInput,
  );

  await createMotorScenario(
    world,
    renderContext,
    renderLayers.foreground,
    new Vector2(columnWidth / 2, height * 0.1),
  );

  // `createThrusterEcsSystem` and `createGustEcsSystem` change
  // `RigidBody.angularVelocity` directly for this tick, and
  // `createAngularVelocityMotorEcsSystem` reads/corrects it, so all three
  // must run before `createPhysicsSyncEcsSystem`, which is what steps
  // `physicsWorld` (see the Applying Forces guide's registration-order
  // caution).
  world.addSystem(createThrusterEcsSystem(time));
  world.addSystem(createGustEcsSystem(time));
  world.addSystem(createAngularVelocityMotorEcsSystem(time));
  world.addSystem(createCameraEcsSystem(time));
  world.addSystem(createRenderEcsSystem(renderContext));
  world.addSystem(createPhysicsSyncEcsSystem(physicsWorld, time));

  return game;
};