Question

Hope there are some GLKViewController experts out there because I have some problems 🙂

Just a quick description of my app. I have a UINavigationController in which I push different screens.

At some point, I get to my game screen which is a subclass of UINavigationController. In this screen, in viewDidLoad I manually create a EAGLContext, GLKView and instantiate a new GLKViewController (to handle my update&draw calls).

I am setting a preferred fps of 30.

The problem is that the first 3-4 update calls come with the correct DT, but then I have 2-3 frames with 1 second between them. I measure the DT using controller.timeSinceLastUpdate.
So I get like:

dt=0.33
dt=0.33
dt=0.33
dt=1.07
dt=1.05
dt=0.33
dt=0.33

After this, I get valid only DT times. I have no idea why those frames have that kind of delay. I measured the time it takes me in the update & draw method, and it’s nowhere near 1 second.

Also, I’m not loading any textures/creating any geometry. Everything is done at loading since it is a rather small game.

Also, if I pop the game screen controller and then push back another instance of the game screen, this new GLKViewController will only call my update method aproximately every 1 second.

Did anybody have a problem with the framerate when using GLKViewController?

Thanks,

Answer 1

Ok, so I finally figured it out. It turns out that it’s not even related to the GLKViewController (surprise surprise!).

It had something to do with the way I’m displaying the game screen view controller, like this:

    GameAreaViewController* gameController = [[GameAreaViewController alloc] init];

    [UIView beginAnimations:@"animation" context:nil];
    [self.navigationController pushViewController: gameController animated:NO]; 
    [UIView setAnimationTransition:UIViewAnimationTransitionFlipFromLeft forView:self.navigationController.view cache:NO]; 
    [UIView setAnimationDuration:0.7f];
    [UIView commitAnimations];        

    SAFE_DEL(gameController);

If I use an animation duration of 0.3f, then I don’t get any lag. At 0.5f sometimes I get it and at 0.7 I was always getting it.