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Game Loop

Game programming Behavioral

Intent

A game loop runs continuously during gameplay. Each turn of the loop, it processes user input without blocking, updates the game state, and renders the game. It tracks the passage of time to control the rate of gameplay.

This pattern decouples progression of game time from user input and processor speed.

Applicability

This pattern is used in every game engine.

Explanation

Real world example

Game loop is the main process of all the game rendering threads. It's present in all modern games. It drives input process, internal status update, rendering, AI and all the other processes.

In plain words

Game Loop pattern ensures that game time progresses in equal speed in all different hardware setups.

Wikipedia says

The central component of any game, from a programming standpoint, is the game loop. The game loop allows the game to run smoothly regardless of a user's input, or lack thereof.

Programmatic Example

Let's start with something simple. Here's Bullet class. Bullets will move in our game. For demonstration purposes it's enough that it has 1-dimensional position.

public class Bullet {

  private float position;

  public Bullet() {
    position = 0.0f;
  }

  public float getPosition() {
    return position;
  }

  public void setPosition(float position) {
    this.position = position;
  }
}

GameController is responsible for moving objects in the game, including the aforementioned bullet.

public class GameController {

  protected final Bullet bullet;

  public GameController() {
    bullet = new Bullet();
  }

  public void moveBullet(float offset) {
    var currentPosition = bullet.getPosition();
    bullet.setPosition(currentPosition + offset);
  }

  public float getBulletPosition() {
    return bullet.getPosition();
  }
}

Now we introduce the game loop. Or actually in this demo we have 3 different game loops. Let's see the base class GameLoop first.

public enum GameStatus {

  RUNNING, STOPPED
}

public abstract class GameLoop {

  protected final Logger logger = LoggerFactory.getLogger(this.getClass());

  protected volatile GameStatus status;

  protected GameController controller;

  private Thread gameThread;

  public GameLoop() {
    controller = new GameController();
    status = GameStatus.STOPPED;
  }

  public void run() {
    status = GameStatus.RUNNING;
    gameThread = new Thread(this::processGameLoop);
    gameThread.start();
  }

  public void stop() {
    status = GameStatus.STOPPED;
  }

  public boolean isGameRunning() {
    return status == GameStatus.RUNNING;
  }

  protected void processInput() {
    try {
      var lag = new Random().nextInt(200) + 50;
      Thread.sleep(lag);
    } catch (InterruptedException e) {
      logger.error(e.getMessage());
    }
  }

  protected void render() {
    var position = controller.getBulletPosition();
    logger.info("Current bullet position: " + position);
  }

  protected abstract void processGameLoop();
}

Here's the first game loop implementation, FrameBasedGameLoop:

public class FrameBasedGameLoop extends GameLoop {

  @Override
  protected void processGameLoop() {
    while (isGameRunning()) {
      processInput();
      update();
      render();
    }
  }

  protected void update() {
    controller.moveBullet(0.5f);
  }
}

Finally, we show all the game loops in action.

    try {
      LOGGER.info("Start frame-based game loop:");
      var frameBasedGameLoop = new FrameBasedGameLoop();
      frameBasedGameLoop.run();
      Thread.sleep(GAME_LOOP_DURATION_TIME);
      frameBasedGameLoop.stop();
      LOGGER.info("Stop frame-based game loop.");

      LOGGER.info("Start variable-step game loop:");
      var variableStepGameLoop = new VariableStepGameLoop();
      variableStepGameLoop.run();
      Thread.sleep(GAME_LOOP_DURATION_TIME);
      variableStepGameLoop.stop();
      LOGGER.info("Stop variable-step game loop.");

      LOGGER.info("Start fixed-step game loop:");
      var fixedStepGameLoop = new FixedStepGameLoop();
      fixedStepGameLoop.run();
      Thread.sleep(GAME_LOOP_DURATION_TIME);
      fixedStepGameLoop.stop();
      LOGGER.info("Stop variable-step game loop.");
      
    } catch (InterruptedException e) {
      LOGGER.error(e.getMessage());
    }

Program output:

Start frame-based game loop:
Current bullet position: 0.5
Current bullet position: 1.0
Current bullet position: 1.5
Current bullet position: 2.0
Current bullet position: 2.5
Current bullet position: 3.0
Current bullet position: 3.5
Current bullet position: 4.0
Current bullet position: 4.5
Current bullet position: 5.0
Current bullet position: 5.5
Current bullet position: 6.0
Stop frame-based game loop.
Start variable-step game loop:
Current bullet position: 6.5
Current bullet position: 0.038
Current bullet position: 0.084
Current bullet position: 0.145
Current bullet position: 0.1805
Current bullet position: 0.28
Current bullet position: 0.32
Current bullet position: 0.42549998
Current bullet position: 0.52849996
Current bullet position: 0.57799995
Current bullet position: 0.63199997
Current bullet position: 0.672
Current bullet position: 0.778
Current bullet position: 0.848
Current bullet position: 0.8955
Current bullet position: 0.9635
Stop variable-step game loop.
Start fixed-step game loop:
Current bullet position: 0.0
Current bullet position: 1.086
Current bullet position: 0.059999995
Current bullet position: 0.12999998
Current bullet position: 0.24000004
Current bullet position: 0.33999994
Current bullet position: 0.36999992
Current bullet position: 0.43999985
Current bullet position: 0.5399998
Current bullet position: 0.65999967
Current bullet position: 0.68999964
Current bullet position: 0.7299996
Current bullet position: 0.79999954
Current bullet position: 0.89999944
Current bullet position: 0.98999935
Stop variable-step game loop.

Class diagram

alt text

Credits