On Mar 28, 2012, at 6:22 AM, David Delmonte wrote:
> Hi, I'm trying to do the above. I've added a simple UIButton at the
> AppDelegate level (as there is no ViewController).
>
> When the button is tapped:
>
> - (IBAction)pictureButtonTapped:(id)sender {
> NSLog(@"%s", __FUNCTION__);
> drawingView.backgroundColor = [UIColor colorWithPatternImage:[UIImage
> imageNamed:@"background.png"]];
> [drawingView playRay];
> }
>
> and this results in:
>
> <CAEAGLLayer: 0x6c4a640>: calling -display has no effect.
>
> I only know enough to be dangerous, so any advice on using the GLPaint sample
> (or alternatives) and this issue specifically, would be most welcome...
Given that you are working from GLPaint, the solution is to upload the image as
a texture and draw it via OpenGL (at least, this is the most expedient and
performant solution).
For some background since it explains the warning you got:
When you set a background color with a pattern on a UIView, UIKit will may need
to draw that pattern via -drawRect:, which involves calling -setNeedsDisplay
(and eventually -display) on the underlying CALayer. The CAEAGLLayer however
doesn't draw via its -display method, and just logs the message above.
--
David Duncan
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