On Wed, 2008-04-30 at 14:39 -0400, Alex Deucher wrote: > On Wed, Apr 30, 2008 at 3:06 AM, Michel Dänzer > <[EMAIL PROTECTED]> wrote: > > On Tue, 2008-04-29 at 16:52 -0400, Alex Deucher wrote: > > > On Tue, Apr 29, 2008 at 4:34 PM, Alex Rades <[EMAIL PROTECTED]> wrote: > > > > Hi, > > > > when playing videos (either in xv or plain x11) on my x1250, I always > > see > > > > horizontal (not diagonal, which are now fixed) tearing problems. They > > seem > > > > related to vertical sync problems. Do you have suggestions? > > > > > > We need sync to vblank support for textured video to properly deal > > > with that. this untested hack may help, but it's not optimal: > > > http://www.botchco.com/alex/xorg/texvid_wait_vsync.diff > > > > Good to see this getting tackled. Here's what I think is missing: > > > > * Set up the CRTC*_GUI_TRIG_VLINE register such that it waits for > > scanout to be outside of the destination vertical range. > > yeah, makes sense. > > > * Only wait if the window isn't redirected (backing pixmap is the > > screen pixmap) > > yeah, as you said, any rendering to the front buffer should wait for > vblank.
Technically not for vblank, but for scanout to be outside of the affected vertical screen range. > I may play around with it a bit if I have time, but unfortunately, I > seem to be unable to notice tearing generally. Do you have any good > tips or content that would make it easier to notice? Generally, I find it most noticeable with horizontal animation or with large solid areas that continuously change colour. > The other issue is that the current IB scheme doesn't really lend > itself to this. Ideally we'd queue up everything and then pre-pend a > wait_until vblank when we submit the IB. I don't think one wait per IB is sufficient anyway, as any given IB will likely have both on- and offscreen operations. It could be tricky to find a good granularity for the waits. > Additionally, we have the issue of multiple crtcs for regular > rendering as well. In that case, we really need shatter. Right, or again pick the CRTC with larger visibility and/or let the user choose somehow. -- Earthling Michel Dänzer | http://tungstengraphics.com Libre software enthusiast | Debian, X and DRI developer _______________________________________________ xorg-driver-ati mailing list xorg-driver-ati@lists.x.org http://lists.x.org/mailman/listinfo/xorg-driver-ati