Marrying Core Animation with OpenGL ES
- by Ole Begemann
Edit: I suppose instead of the long explanation below I might also ask: Sending -setNeedsDisplay to an instance of CAEAGLLayer does not cause the layer to redraw (i.e., -drawInContext: is not called). Instead, I get this console message:
<GLLayer: 0x4d500b0>: calling -display has no effect.
Is there a way around this issue? Can I invoke -drawInContext: when -setNeedsDisplay is called? Long explanation below:
I have an OpenGL scene that I would like to animate using Core Animation animations.
Following the standard approach to animate custom properties in a CALayer, I created a subclass of CAEAGLLayer and defined a property sceneCenterPoint in it whose value should be animated. My layer also holds a reference to the OpenGL renderer:
#import <UIKit/UIKit.h>
#import <QuartzCore/QuartzCore.h>
#import "ES2Renderer.h"
@interface GLLayer : CAEAGLLayer
{
ES2Renderer *renderer;
}
@property (nonatomic, retain) ES2Renderer *renderer;
@property (nonatomic, assign) CGPoint sceneCenterPoint;
I then declare the property @dynamic to let CA create the accessors, override +needsDisplayForKey: and implement -drawInContext: to pass the current value of the sceneCenterPoint property to the renderer and ask it to render the scene:
#import "GLLayer.h"
@implementation GLLayer
@synthesize renderer;
@dynamic sceneCenterPoint;
+ (BOOL) needsDisplayForKey:(NSString *)key
{
if ([key isEqualToString:@"sceneCenterPoint"]) {
return YES;
} else {
return [super needsDisplayForKey:key];
}
}
- (void) drawInContext:(CGContextRef)ctx
{
self.renderer.centerPoint = self.sceneCenterPoint;
[self.renderer render];
}
...
(If you have access to the WWDC 2009 session videos, you can review this technique in session 303 ("Animated Drawing")).
Now, when I create an explicit animation for the layer on the keyPath @"sceneCenterPoint", Core Animation should calculate the interpolated values for the custom properties and call -drawInContext: for each step of the animation:
- (IBAction)animateButtonTapped:(id)sender
{
CABasicAnimation *animation = [CABasicAnimation animationWithKeyPath:@"sceneCenterPoint"];
animation.duration = 1.0;
animation.fromValue = [NSValue valueWithCGPoint:CGPointZero];
animation.toValue = [NSValue valueWithCGPoint:CGPointMake(1.0f, 1.0f)];
[self.glView.layer addAnimation:animation forKey:nil];
}
At least that is what would happen for a normal CALayer subclass. When I subclass CAEAGLLayer, I get this output on the console for each step of the animation:
2010-12-21 13:59:22.180 CoreAnimationOpenGL[7496:207] <GLLayer: 0x4e0be20>: calling -display has no effect.
2010-12-21 13:59:22.198 CoreAnimationOpenGL[7496:207] <GLLayer: 0x4e0be20>: calling -display has no effect.
2010-12-21 13:59:22.216 CoreAnimationOpenGL[7496:207] <GLLayer: 0x4e0be20>: calling -display has no effect.
2010-12-21 13:59:22.233 CoreAnimationOpenGL[7496:207] <GLLayer: 0x4e0be20>: calling -display has no effect.
...
So it seems that, possibly for performance reasons, for OpenGL layers, -drawInContext: is not getting called because these layers do not use the standard -display method to draw themselves. Can anybody confirm that? Is there a way around it?
Or can I not use the technique I laid out above? This would mean I would have to implement the animations manually in the OpenGL renderer (which is possible but not as elegant IMO).
