In Apple document QA1385, in Listing 2, describing how to drive OpenGL
Rendering Loops 10 years ago, an NSTimer, repeating every 1 millisecond, is
added to an app’s run loop [1]. Referring to this timer, the text says that:
"When vertical synchronization is enabled in your OpenGL application, during
each retrace period, when the timer fires, …”
Hmmmm, a timer with time interval of 1 millisecond is now going to fire during
each retrace period, 16.7 milliseconds or so! This implies that when vertical
synchronization is enabled in an OpenGL application, the application’s run
loop, in all modes, is synchronized to the video frame and can go no faster.
Is this correct?
Jerry
[1]
renderTimer = [NSTimer timerWithTimeInterval:0.001 // 1ms
target:self
selector:@selector(timerFired:)
userInfo:nil
repeats:YES] ;
[[NSRunLoop currentRunLoop] addTimer:renderTimer
forMode:NSDefaultRunLoopMode];
[[NSRunLoop currentRunLoop] addTimer:renderTimer
forMode:NSEventTrackingRunLoopMode];
_______________________________________________
Cocoa-dev mailing list (Cocoa-dev@lists.apple.com)
Please do not post admin requests or moderator comments to the list.
Contact the moderators at cocoa-dev-admins(at)lists.apple.com
Help/Unsubscribe/Update your Subscription:
https://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com
This email sent to arch...@mail-archive.com
