On Monday, June 25, 2007 11:46:59 Michel Dänzer wrote:
> On Mon, 2007-06-25 at 08:43 -0700, Jesse Barnes wrote:
> > On Monday, June 25, 2007 4:00:01 am Michel Dänzer wrote:
> > > On Fri, 2007-06-22 at 11:13 -0700, Jesse Barnes wrote:
> > > > diff-tree 97dcd7fd25c18d5148619254229f8d94efb55b44 (from
> > > > 2d24455ed8b12df6d06d135cb70f02473d11f4b0) Author: Jesse Barnes
> > > > <[EMAIL PROTECTED]>
> > > > Date: Fri Jun 22 11:06:51 2007 -0700
> > > >
> > > > more vblank rework
> > > > - use a timer for disabling vblank events to avoid
> > > > enable/disable calls too often
> > > > - make i915 work with pre-965 chips again (would like to
> > > > structure this better, but this hack works on my test system)
> > >
> > > Can you elaborate on the latter? The previous code seemed to work
> > > fine on my i915 system...
> >
> > Any app wanting to sync to vblank on 915 hung prior to these mods,
> > since the vblank counter never incremented. Did you see that
> > working [...]
>
> Yes, I consider sync-to-vblank the main feature for vblank-rework. :)
>
> How exactly did you test (vblank_mode=2 glxgears here), and did the
> app(s) hang indefinitely or just initially for three seconds?
IIRC my test app hung indefinitely. Main loop was something like:
while (i++) {
/* Wait for vsync */
if (waitforsync)
video_sync(2, (count + 1) % 2, &count);
/* Alternate colors to make tearing obvious */
if (i & 1)
glClearColor(1.0f, 1.0f, 1.0f, 1.0f);
else
glClearColor(1.0f, 0.0f, 0.0f, 0.0f);
glClear(GL_COLOR_BUFFER_BIT);
glFlush();
}
If waitforsync == 0, I get obvious tearing (a kind of "rain" effect of
the two colors I painted), while if waitforsync != 0, the app either
hangs or alternates at the refresh rate, making kind of an orange
color. But I'll retest (though I don't see how it could have worked
for you unless 915 has these registers too in the same location).
Does vblank_mode= work with the Intel driver too? The docs I found only
mentioned radeon and mga...
Jesse
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