[Bug 28771] Vsync always on

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=28771

--- Comment #14 from Toni Spets <toni.spets at iki.fi> 2010-07-18 05:09:18 PDT ---
(In reply to comment #13)
> (In reply to comment #11)
> > (In reply to comment #10)
> > > 
> > > What is the real solution and why is this patch needed in DDX?
> > 
> > The real solution to what?  The various GLX vsync/vblank extensions basically
> > just expose frame counters and vertical retrace events to applications so they
> > can use them for synchronization.
> 
> I guess what people want is a way to turn it off without patching, games don't
> seem to be able to.
> 
> Personally I am not that bothered about tearing in FPS type games and my old PC
> is often not able to render at refresh rate anyway - which means without triple
> buffering vsync hurts my already low framerate.
> 

Yes, this is exactly what I'm talking about.

Quake-style games have options like gl_swapinterval and gl_ext_swapinterval but
they do not seem to do anything. Honestly I don't even know what they should
do, but on other platforms they used to disable vsync on some cards.

> > The code in the ddx you are asking about has nothing to
> > do with the GLX vsync/vblank extensions; it is there to prevent tearing on 
> > GL buffer swaps.

And it hurts performance not being able to turn it off without a patch. I like
tearing! ;-)

Btw. are we still on-topic on this bug when the actual fix for vblank_mode was
already committed?

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