* [Bug 97059] Tahiti+DRI3+Unity+Blender corruption
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--- Comment #1 from dave <eunbolt@gmail.com> ---
Created attachment 125273
--> https://bugs.freedesktop.org/attachment.cgi?id=125273&action=edit
lshw output
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--- Comment #2 from dave <eunbolt@gmail.com> ---
Hello,
Sorry for not explaining the issue, I don't know how to edit the first comment.
I have noticed a bug in the rendering of blender using Radeonsi drivers and
dri3. This happens with different versions of blender also.
I'm using padoka's PPA and ubuntu 16.04. more details in the First comment.
If I am missing anything let me know and i will get more information.
Thanks
Dave
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--- Comment #3 from Michel Dänzer <michel@daenzer.net> ---
Can't seem to reproduce this with blender 2.77.a+dfsg0-5 . Which versions have
you tried?
Does setting the environment variable LIBGL_DRI3_DISABLE=1 for the blender
process avoid the problem?
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--- Comment #4 from dave <eunbolt@gmail.com> ---
I have always had this issue with this card and blender[I normally keep up to
date with blenders releases](this is only only application I have noticed it
on.) issue affects blender 2.60a also. I can try more if you would like.
setting the variable LIBGL_DRI3_DISABLE=1 seems to make the issue go away.
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--- Comment #5 from smoki <smoki00790@gmail.com> ---
I reproduced this on current Debian Sid and Kabini with current distro
packages, same blender as Michel's.
LIBGL_DRI3_DISABLE=1 fixes it, but...
But it is tricky one, it has something to do with vsync it seems, as also is
not reproducable with vblank_mode=3 , but with vblank_mode=0 it is there :)
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--- Comment #6 from smoki <smoki00790@gmail.com> ---
But sync on seems cleared it for the window once, but if in fullscreen
(ALT+F11) corruption appear with both vblank on/off.
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--- Comment #7 from smoki <smoki00790@gmail.com> ---
modesetting driver also show this corruption. No corruption with
LIBGL_ALWAYS_SOFTWARE=1 etc...
Enough testing from me, bug is there.
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--- Comment #8 from Michel Dänzer <michel@daenzer.net> ---
I suspect this is a blender bug. It clearly doesn't render at all to the
corrupted parts of its window, but AFAICT it doesn't use any of the
GLX_EXT_buffer_age, GLX_OML_swap_method or GLX_INTEL_swap_event extensions to
find out what if any guarantees there are about the contents of the back buffer
after a buffer swap. blender's assumptions about that may happen to be valid
with DRI2, which can only use up to two buffers, but not with DRI3, which can
use more.
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--- Comment #9 from smoki <smoki00790@gmail.com> ---
Yeah possible Michel, i actually played a little bit with his options and
found this:
CTRL+ALT+U > System > Window Draw Method
Default is Automatic and if i set it to 'Triple Buffer' this issue goes away
:)
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--- Comment #10 from dave <eunbolt@gmail.com> ---
If I also set it to triple buffer the problem has gone away.
Should I report this on the blender bug tracker?
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Michel Dänzer <michel@daenzer.net> changed:
What |Removed |Added
----------------------------------------------------------------------------
Resolution|--- |NOTOURBUG
Status|NEW |RESOLVED
--- Comment #11 from Michel Dänzer <michel@daenzer.net> ---
(In reply to dave from comment #10)
> Should I report this on the blender bug tracker?
Yes, please.
Resolving as not our bug.
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Michel Dänzer <michel@daenzer.net> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |darkdefende@gmail.com
--- Comment #12 from Michel Dänzer <michel@daenzer.net> ---
*** Bug 98286 has been marked as a duplicate of this bug. ***
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Michel Dänzer <michel@daenzer.net> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |dark.shadow4@web.de
--- Comment #13 from Michel Dänzer <michel@daenzer.net> ---
*** Bug 100266 has been marked as a duplicate of this bug. ***
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--- Comment #14 from Fabian Maurer <dark.shadow4@web.de> ---
The opengl calls blender make are faulty, since a trace doesn't render properly
on windows with proprietary AMD drivers either.
Though I still want to ask, could we get rid of the random contents? Under
windows it's just black instead of drawing random images. To me at least that
seems like the better approach.
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Michel Dänzer <michel@daenzer.net> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |freedesktop@ca.sh13.net
--- Comment #15 from Michel Dänzer <michel@daenzer.net> ---
*** Bug 102814 has been marked as a duplicate of this bug. ***
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