CCTime delta times seem to be very inconsistent.
If you download the latest Cocos2d-X and open the HelloCpp sample app, add a “scheduleUpdate();” to the end of the “bool HelloWorld::init()” function, add the following function for the update call:
void HelloWorld::update( float dt )
CCLOG( "delta: %f\n",dt );
When it is running, you will see the log output like this:-
In an app that isn’t really doing anything should give values very near 0.01666r (60fps or 1/60=1.666r). Values of 0.0172, 0.0156 and 0.0184 are very far out for an app that isn’t really doing anything. If you are animating a sprites movement with the delta value “pos.x = pos.x+(movement * delta);” then the movement is visibly jerky.
I’ve tested this on an iPhone 4 and in Android on a Samsung GS3, same result. Is there something wrong with Cocos2D-X’s engine?
Note: I posted about this 11 months ago but it is still going on (here: http://www.cocos2d-x.org/boards/6/topics/10831?r=10878\#message-10878).