在OSX / iPhone上定时OpenGL动画的最佳方式

Question

我一直在Mac上使用特定于Mac的OpenGL API在OpenGL上进行实验，创建精确动画循环的最佳方法是什么？

Answer 1

Use GLKit which is available since iOS 5 and takes away a lot boiler plate code you usually have to write for yourself. Particularly the game/animation loop stuff is handled by the framework. Basically you have to implement some delegate methods:

GLKViewControllerDelegate for updating vertices etc.:

- (void)glkViewControllerUpdate:(GLKViewController *)controller

GLKViewDelegate fro drawing:

- (void)glkView:(GLKView *)view drawInRect:(CGRect)rect

This is good point to start reading.

Answer 2

On the Mac side you're probably used to using CVDisplayLink to synchronise with the vertical retrace. The iOS equivalent is CADisplayLink — it's basically the same functionality but responsibility is given to CoreAnimation rather than CoreVideo and the syntax differs slightly.

If you are willing to target iOS 5 exclusively then Kai's advice is probably best. Just use one of GLKit's new view controllers and all the stuff related to creating and wiring up a display link is handled for you.

Answer 3

Well, I have no experience with mobile dev, but I guess the idea is the same as on a PC. The keyframe interpolation of animated models should be done each time you render your scene (if necessary, of course).