On Fri, 2007-10-12 at 01:49 +0200, Roman Haefeli wrote: > On Fri, 2007-10-12 at 00:48 +0200, cyrille henry wrote: > > > > Thomas O Fredericks a écrit : > > > "sync to vblank will sync swapping buffer with the screen frame rate, but > > > that's not the original question. > > > to my knowledge, there is no possibility to sync gem rendering with the > > > screen frame rate. > > > if you fix both at 60Hz, you can have jitter (not a lot, but some)." > > > > > > You are not technically syncing gem to the screen frame rate. > > yes > > > You are > > > syncing the open gl redraw to the framerate. > > yes > > >The GPU takes care of that. > > > > > i don't understand this. > > > > if you get gem to render a 60FPS, you will have 60fps based on the pd (cpu) > > clock. > > i don't know this by reading the code, but for me it would only make > sense to get the clock from the audio-card, nothing else. this is also > what i experienced, when pd was running on jackd, while jackd was > believing to be running at 44100Hz, while it was actually at 48000Hz. > all [metro]s were too fast and all pitches too high. the only objects, > that seems to work not with the audio-clock, that come to my mind, are > [cputime] and [realtime] (is that true?) > > > if you set your screen at 60fps, you will have 60fps based on the gpu. > > there is no way to make the cpu clock to be exactely the same speed as the > > gpu clock. > > so, sometime (specially with big patch), you can have desincronisation > > between this 2 clocks, even if they should be at the same speed. > > (there is a also a lot's of jitter in pd clock) > > what makes you think that? i 'd claim, that pd's clock is stable, unless > you get audio drop-outs.
yo, it seems, that [gemhead] uses pd's logical time, which probably makes a lot of sense for many applications. but for many other applications it would be better (read: the result would look nicer), if [gemhead] would get it's tick from the gpu and not from pd/audiocard, i think. is that something that would be possible to do and might be worth a feature request on gem-dev? roman ___________________________________________________________ Telefonate ohne weitere Kosten vom PC zum PC: http://messenger.yahoo.de _______________________________________________ PD-list@iem.at mailing list UNSUBSCRIBE and account-management -> http://lists.puredata.info/listinfo/pd-list