Java OpenGL 2D Game Tutorial - Episode 14 - Finishing The Game Loop

In this episode we finish getting the game loop ready for action!
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[TheShitAssistant]

Hey, I just stumbled upon this series and it was really helpful so far. Thanks a lot!

I know, it has been a while, but do you still remember, how you got rid of the fps cap?

[Ludoovik]

at line 47 how does the compiler know that (1 000 000 000) is in nanosecond and it has to convert it in seconds ? Also why at line 56 do we divide by 1 000 000 ?

[BingtheLizard]

Here's how I'm writing mine (so far) with a ScheduledExecutorService to take care of updates. Java's Util Concurrent ScheduledExecutorService is generally recommended more highly than manual management of Thread timing & sleeping, and is regarded as a more robust implementation.


public class GameLoop {

private static final double MILLIS_PER_SECOND = 1000.0;
private static final double MICROS_PER_SECOND =
private static final double UPDATE_FREQUENCY = 60.0;
private static final ScheduledExecutorService scheduler =
private static final Runnable scheduledUpdate = new Runnable() {
public void run() {
long currentTimeMillis = System.currentTimeMillis();
double deltaTime = (double) (currentTimeMillis - previousTimeMillis)
/ MILLIS_PER_SECOND;
previousTimeMillis = currentTimeMillis;
updateGame(deltaTime);
}
};
private static ScheduledFuture<?> scheduledUpdateHandle;
private static long previousTimeMillis;

public static void start() {
if (scheduledUpdateHandle == null || {
previousTimeMillis = System.currentTimeMillis();
long updatePeriod = (long) (MICROS_PER_SECOND / UPDATE_FREQUENCY);
scheduledUpdateHandle = scheduler.scheduleAtFixedRate(scheduledUpdate, updatePeriod, updatePeriod,
TimeUnit.MICROSECONDS);
}
}

public static void stop() {
if {

}
}

private static void updateGame(double deltaTime) {
World.update(deltaTime);
Renderer.render();
}

public void onDispose() {
stop();
scheduler.shutdown();
}
}