* [Bug 98784] Talos Principle rendering flickering garbage on start instead of its logo and loading squares
2016-11-19 17:12 [Bug 98784] Talos Principle rendering flickering garbage on start instead of Croteam logo bugzilla-daemon
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https://bugs.freedesktop.org/show_bug.cgi?id=98784
Vedran Miletić <vedran@miletic.net> changed:
What |Removed |Added
----------------------------------------------------------------------------
Summary|Talos Principle rendering |Talos Principle rendering
|flickering garbage on start |flickering garbage on start
|instead of Croteam logo |instead of its logo and
| |loading squares
--- Comment #1 from Vedran Miletić <vedran@miletic.net> ---
Oops. Croteam logo is indeed there aftewards.
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* [Bug 98784] Talos Principle rendering flickering garbage on start instead of its logo and loading squares
2016-11-19 17:12 [Bug 98784] Talos Principle rendering flickering garbage on start instead of Croteam logo bugzilla-daemon
2016-11-19 17:23 ` [Bug 98784] Talos Principle rendering flickering garbage on start instead of its logo and loading squares bugzilla-daemon
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https://bugs.freedesktop.org/show_bug.cgi?id=98784
--- Comment #2 from Darren Salt <bugspam@moreofthesa.me.uk> ---
Also observed on Polaris10 and Juniper XT. Looks like the game's flipping
between two pages of tiled junk.
Running with LIBGL_DRI3_DISABLE set eliminates the flashing junk, but no
further rendering (except for Steam overlay) is done until initialisation is
completed.
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* [Bug 98784] Talos Principle rendering flickering garbage on start instead of its logo and loading squares
2016-11-19 17:12 [Bug 98784] Talos Principle rendering flickering garbage on start instead of Croteam logo bugzilla-daemon
2016-11-19 17:23 ` [Bug 98784] Talos Principle rendering flickering garbage on start instead of its logo and loading squares bugzilla-daemon
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https://bugs.freedesktop.org/show_bug.cgi?id=98784
Vedran Miletić <vedran@miletic.net> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |regression
--- Comment #3 from Vedran Miletić <vedran@miletic.net> ---
Works correctly with LLVM 3.8 and Mesa 12.0.3.
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* [Bug 98784] Talos Principle rendering flickering garbage on start instead of its logo and loading squares
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https://bugs.freedesktop.org/show_bug.cgi?id=98784
--- Comment #4 from Andy Furniss <adf.lists@gmail.com> ---
(In reply to Vedran Miletić from comment #0)
> Created attachment 128072 [details]
> Talos rendering in place of Croteam logo
>
> I'm using Mesa and LLVM git snapshots on kernel 4.8.8 on Tonga (R9 380X).
Maybe something else, but llvm master does currently have an issue. You could
try llvm with the commit reverted.
https://llvm.org/bugs/show_bug.cgi?id=31019
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* [Bug 98784] Talos Principle rendering flickering garbage on start instead of its logo and loading squares
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https://bugs.freedesktop.org/show_bug.cgi?id=98784
--- Comment #5 from Vedran Miletić <vedran@miletic.net> ---
(In reply to Andy Furniss from comment #4)
> (In reply to Vedran Miletić from comment #0)
> > Created attachment 128072 [details]
> > Talos rendering in place of Croteam logo
> >
> > I'm using Mesa and LLVM git snapshots on kernel 4.8.8 on Tonga (R9 380X).
>
> Maybe something else, but llvm master does currently have an issue. You
> could try llvm with the commit reverted.
>
> https://llvm.org/bugs/show_bug.cgi?id=31019
This actually fixes bug 98783 and bug 98785. Just not this one. :-D
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* [Bug 98784] Talos Principle rendering flickering garbage on start instead of its logo and loading squares
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https://bugs.freedesktop.org/show_bug.cgi?id=98784
--- Comment #6 from Vedran Miletić <vedran@miletic.net> ---
Further findings: similar flickering occurs in Talos Principle latest public
beta (not in stable) when switching GPU Speed from High to Ultra, after
clicking Apply. The setting gets applied after a while, as expected.
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https://bugs.freedesktop.org/show_bug.cgi?id=98784
--- Comment #7 from Samuel Pitoiset <samuel.pitoiset@gmail.com> ---
Can you try with LIBGL_DRI3_DISABLE=1 ? This will use DRI2 and it should fix
the flickering.
After bisecting, the first bad commit seems to be:
commit d3d33918c79d9e87aedaf6f70ed39f75eed262a0
Author: Michel Dänzer <michel.daenzer@amd.com>
Date: Wed Aug 17 17:02:04 2016 +0900
loader/dri3: Overhaul dri3_update_num_back
Always use 3 buffers when flipping. With only 2 buffers, we have to wait
for a flip to complete (which takes non-0 time even with asynchronous
flips) before we can start working on the next frame. We were previously
only using 2 buffers for flipping if the X server supports asynchronous
flips, even when we're not using asynchronous flips. This could result
in bad performance (the referenced bug report is an extreme case, where
the inter-frame stalls were preventing the GPU from reaching its maximum
clocks).
I couldn't measure any performance boost using 4 buffers with flipping.
Performance actually seemed to go down slightly, but that might have
been just noise.
Without flipping, a single back buffer is enough for swap interval 0,
but we need to use 2 back buffers when the swap interval is non-0,
otherwise we have to wait for the swap interval to pass before we can
start working on the next frame. This condition was previously reversed.
Cc: "12.0 11.2" <mesa-stable@lists.freedesktop.org>
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=97260
Reviewed-by: Frank Binns <frank.binns@imgtec.com>
Reviewed-by: Eric Anholt <eric@anholt.net>
(cherry picked from commit 1e3218bc5ba2b739261f0c0bacf4eb662d377236)
Squashed with commit:
loader/dri3: Always use at least two back buffers
This can make a significant difference for performance with some extreme
test cases such as vblank_mode=0 glxgears.
Fixes: 1e3218bc5ba2 ("loader/dri3: Overhaul dri3_update_num_back")
Cc: "12.0 11.2" <mesa-stable@lists.freedesktop.org>
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=97549
Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>
Tested-by: Dieter Nützel <Dieter@nuetzel-hh.de>
(cherry picked from commit dc3bb5db8c81e7f08ae12ea5d3ee999e2afcbfd1)
:040000 040000 aa5cf86f1e98d023f9539a6a15654fd9754101a2
fb92ad057feeb3fbff38d808c71c7e5e1cead9af M src
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* [Bug 98784] Talos Principle rendering flickering garbage on start instead of its logo and loading squares
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https://bugs.freedesktop.org/show_bug.cgi?id=98784
--- Comment #8 from network723@rkmail.ru ---
I confirm, LIBGL_DRI3_DISABLE=1 fixes flickering in Talos, blender and firefox'
opengl-accelerated videos
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https://bugs.freedesktop.org/show_bug.cgi?id=98784
--- Comment #9 from Michel Dänzer <michel@daenzer.net> ---
This is likely a Talos bug, making incorrect assumptions about the number of
buffers / the contents of the back buffer after SwapBuffers. If somebody can
make an apitrace reproducing the problem, that could help confirm.
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--- Comment #10 from network723@rkmail.ru ---
I made traces of Talos and blender affected by this bug
I'm sorry, but I couldn't upload it anywhere else:
http://file.karelia.ru/t8766g/
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https://bugs.freedesktop.org/show_bug.cgi?id=98784
Michel Dänzer <michel@daenzer.net> changed:
What |Removed |Added
----------------------------------------------------------------------------
Resolution|--- |NOTOURBUG
Status|NEW |RESOLVED
--- Comment #11 from Michel Dänzer <michel@daenzer.net> ---
The apitrace seems to confirm a Talos bug. It looks like Talos tries to clear
the back buffer with glClear, but it still has a non-default framebuffer object
bound with glBindFramebuffer, so the glClear doesn't affect the back buffer.
I'd like someone else to take a look and confirm this though.
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https://bugs.freedesktop.org/show_bug.cgi?id=98784
Michel Dänzer <michel@daenzer.net> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |germano.massullo@gmail.com
--- Comment #12 from Michel Dänzer <michel@daenzer.net> ---
*** Bug 99452 has been marked as a duplicate of this bug. ***
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--- Comment #13 from Germano Massullo <germano.massullo@gmail.com> ---
I have just wrote an e-mail to Croteam support, attaching the URL of this
bugreport. I will let you know about any their reply.
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--- Comment #14 from Germano Massullo <germano.massullo@gmail.com> ---
With the permission of Dean Sekulic of Croteam, I attach here his replies to my
e-mail message:
===============
I've just double checked and we definately set GL_DRAW_FRAMEBUFFER to 0
(default back buffer) before clear.
So wild guess would be that this is a driver issue...?!
Or I missed something. :/
[...]
Please do investigate, as I'm not 100% sure that we did everything correctly
from our side.
===============
Michel Dänzer and the others, what do you think about?
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https://bugs.freedesktop.org/show_bug.cgi?id=98784
--- Comment #15 from Michel Dänzer <michel@daenzer.net> ---
Thanks for raising the issue with Croteam.
(In reply to Germano Massullo from comment #14)
> I've just double checked and we definately set GL_DRAW_FRAMEBUFFER to 0
> (default back buffer) before clear.
When I look at the trace from comment #10 in qapitrace, I see a bunch of
glBindFramebuffer(GL_DRAW_FRAMEBUFFER, ...) calls in frame 0, the last one
being
glBindFramebuffer(GL_DRAW_FRAMEBUFFER, 31)
After that, there are no glBindFramebuffer calls for a long time.
GL_DRAW_FRAMEBUFFER isn't set to 0 before frame 777, after which the flickering
stops, and the window contents start looking as expected.
I've now also confirmed this with running glretrace in gdb and setting a
breakpoint at _mesa_BindFramebuffer.
I'd definitely like somebody else to confirm the above though, to make sure I'm
not missing anything.
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--- Comment #16 from Torbjörn Andersson <eriknospam@telia.com> ---
I can't reproduce the glitch any more. Perhaps today's update of the game fixed
it?
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* [Bug 98784] Talos Principle rendering flickering garbage on start instead of its logo and loading squares
2016-11-19 17:12 [Bug 98784] Talos Principle rendering flickering garbage on start instead of Croteam logo bugzilla-daemon
` (15 preceding siblings ...)
2017-02-14 18:46 ` bugzilla-daemon
@ 2017-02-15 9:27 ` bugzilla-daemon
16 siblings, 0 replies; 18+ messages in thread
From: bugzilla-daemon @ 2017-02-15 9:27 UTC (permalink / raw)
To: dri-devel
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https://bugs.freedesktop.org/show_bug.cgi?id=98784
--- Comment #17 from Germano Massullo <germano.massullo@gmail.com> ---
(In reply to Torbjörn Andersson from comment #16)
> I can't reproduce the glitch any more. Perhaps today's update of the game
> fixed it?
I still experience the problem even after the update
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