[virglrenderer-devel] Strange graphical glitches under virgl.

[Lepton Wu]

I think the bug is inside vrend_renderer_blit_int, I just tried to
change use_gl to true inside this function and it also
fixed this issue.

So it seems use_gl==false  code path inside vrend_renderer_blit_int
has some kind of bug.
On Fri, Jul 20, 2018 at 4:38 PM Lepton Wu <lepton at chromium.org> wrote:
>
> Thanks Gurchetan he confirmed with me that he didn't see such kind of
> issue in his setup.
> So I just upgraded everything to TOT and find out this issuse was
> gone. With bisect, I tracked down
> this issue get fixed by this one:
>
> https://patchwork.freedesktop.org/patch/230529/
>
> So I guess does this mean there is some bug for regular memcpy code path?
> On Fri, Jul 20, 2018 at 2:28 PM Gurchetan Singh
> <gurchetansingh at chromium.org> wrote:
> >
> > On Fri, Jul 20, 2018 at 2:21 PM Lepton Wu <lepton at chromium.org> wrote:
> > >
> > > Hi,
> > >
> > > I have an issue which I recorded a video  to show the bug:
> > > https://youtu.be/ECGDCMAOTxs
> > > You can see, sometimes, there is a "wrong block" of rendering. It's
> > > always some kind of rectangle somewhere.
> > > A strange part is: I've never seen this kind of issue if I am running
> > > 3D android games under virgl. Games always
> > > running fine. But for Chrome, it sometimes come with this kind of
> > > weird graphics.
> > >
> > > So I have 2 questions:
> > >
> > > 1.  What kind of guest are you using to test virgl?  I am trying to
> > > test some other guests to see if I can reproduce
> > > same issue so I can confirm if this is something specific to my guest
> > > (Chrome OS).
> >
> > Most people use Ubuntu VMs.  It's a bit of work to setup -- I'll add
> > some instructions to "Virgl tips and tricks" document and upload a VM
> > to the cloud.
> >
> > > 2.  Do you have any rough idea that this is actually some fixed bug
> > > upstream somewhere?  I am using TOT virglrenderer + TOT qemu.
> > > But my mesa (mesa-18.1_pre1) and linux kernel (4.4) in guest which
> > > could be a little outdated.
> > >
> > > Thanks for your help!
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> > > virglrenderer-devel at lists.freedesktop.org
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