Sunday, December 6, 2009

OpenGL ES Projects and iPhone SDK 3.0

Posted by Hidayat Hidayat at 12:59 PM
If you're having problems getting any of the older OpenGL ES sample code running under SDK 3.0 - specifically if you get a white screen rather than what you're supposed to see, here is the problem - delete the line of code specified below from the App Delegate's applicationDidFinishLaunching: method:

- (void)applicationDidFinishLaunching:(UIApplication*)application
{
CGRect rect = [[UIScreen mainScreen] bounds];

window = [[UIWindow alloc] initWithFrame:rect]; // <-- Delete this

GLViewController *theController = [[GLViewController alloc] init];
self.controller = theController;
[theController release];

GLView *glView = [[GLView alloc] initWithFrame:rect];
[window addSubview:glView];

glView.controller = controller;
glView.animationInterval = 1.0 / kRenderingFrequency;
[glView startAnimation];
[glView release];

[window makeKeyAndVisible];

}



The problem is that there's already window instance in MainWindow.xib, so creating a new one is problematic - there can only be on instance of UIWindow. Under 2.2.1 and before, it worked, under 3.0, it causes problems. In both cases, the line of code should be deleted, however.

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