Re: [Tuxnes-devel] Smoother scrolling

[Jason D. S. <jd...@us...>]

Jason Dorje Short wrote:
> Mike Mestnik wrote:
> 
>> I was chasing a simular problem, but I coulden't get any thing to 
>> work.  I don't think it's
>> correct to cahnge the usleep, as it's based on the NTSC standared.  
>> I.E. 16666 = 1 frame and if
>> were n frames ahead 16666 * ( n - 1 ) is how long we wait.
> 
> 
> You don't want to usleep for a fixed amount of time, or you'll get 
> *behind*.  For instance if you sleep for 10 useconds and then do some 
> calculations that take 5 useconds, your tick length is actually 5 
> useconds instead of 10 useconds as you wanted it to be.  (Just using 10 
> as an example.)

Well, that patch didn't work at all.

The problem, though, is that you're tracking time in frames instead of 
in useconds.  If you're half a frame ahead and you wait for one frame, 
then you'll be half a frame behind.  Or if you wait until you're a frame 
and a half ahead and then wait a frame, you get uneven playing (2 frames 
in quick succession, then a wait before the next frame).

This is hard to change because timeframe is a very different concept. 
But this patch may be a little better (now that I got tuxnes to 
compile).  It's indistinguishable from the current behavior on my computer.

jason