[Nouveau] [Bug 90513] Odd gray and red flicker in The Talos Principle on GK104

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https://bugs.freedesktop.org/show_bug.cgi?id=90513

GitLab Migration User  changed:

   What|Removed |Added

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--- Comment #18 from GitLab Migration User  ---
-- GitLab Migration Automatic Message --

This bug has been migrated to freedesktop.org's GitLab instance and has been
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You can subscribe and participate further through the new bug through this link
to our GitLab instance: https://gitlab.freedesktop.org/mesa/mesa/issues/1073.

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[Nouveau] [Bug 90513] Odd gray and red flicker in The Talos Principle on GK104

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https://bugs.freedesktop.org/show_bug.cgi?id=90513

--- Comment #16 from Ilia Mirkin  ---
Trying to replay this, I see the green splotches in other frames, while the
ones that were bad during my retracediff work out just fine. That will make the
remaining misrenders much trickier to track down.

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[Nouveau] [Bug 90513] Odd gray and red flicker in The Talos Principle on GK104

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https://bugs.freedesktop.org/show_bug.cgi?id=90513

--- Comment #15 from Ilia Mirkin  ---
And here are the diffs. src = gk208, ref = gt215.

https://people.freedesktop.org/~imirkin/traces/talos-diffs.tar

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[Nouveau] [Bug 90513] Odd gray and red flicker in The Talos Principle on GK104

[bugzilla-daemon]

https://bugs.freedesktop.org/show_bug.cgi?id=90513

--- Comment #14 from Ilia Mirkin  ---
Created attachment 124613
  --> https://bugs.freedesktop.org/attachment.cgi?id=124613=edit
list of draws with bad results

I ran a diff (with retracediff.py) against nv50 (after fixing alpha test on
nv50, otherwise it had too many differences). The attached list of draws has
diffs when running GK208 vs GT215, most (all?) randomly-green-stuff related.
[GT215 renders everything fine.]

The trace in question is
https://people.freedesktop.org/~imirkin/traces/talos-karolherbst.trace.xz

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[Nouveau] [Bug 90513] Odd gray and red flicker in The Talos Principle on GK104

[bugzilla-daemon]

https://bugs.freedesktop.org/show_bug.cgi?id=90513

--- Comment #13 from Ilia Mirkin  ---
The shadow/brightness flicker should be helped by

https://cgit.freedesktop.org/mesa/mesa/commit/?id=154c0a42a23187c61ea0a1307198fae667398eba

Moving on to the red/green flickering...

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[Nouveau] [Bug 90513] Odd gray and red flicker in The Talos Principle on GK104

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https://bugs.freedesktop.org/show_bug.cgi?id=90513

--- Comment #11 from Ilia Mirkin  ---
Interesting... same issues don't occur on nv50 (GT215). Need to try to disable
features one-by-one until we find which ext is causing some difference to be
happening.

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[Nouveau] [Bug 90513] Odd gray and red flicker in The Talos Principle on GK104

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https://bugs.freedesktop.org/show_bug.cgi?id=90513

--- Comment #12 from Ilia Mirkin  ---
Actually talos doesn't use any "new" features. So it must be something that's
just plain broken on nvc0... The trace replays fine on nv50.

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[Nouveau] [Bug 90513] Odd gray and red flicker in The Talos Principle on GK104

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https://bugs.freedesktop.org/show_bug.cgi?id=90513

--- Comment #9 from Karol Herbst freedesk...@karolherbst.de ---
yeah I can confirm this.

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[Nouveau] [Bug 90513] Odd gray and red flicker in The Talos Principle on GK104

[bugzilla-daemon]

https://bugs.freedesktop.org/show_bug.cgi?id=90513

--- Comment #8 from Ilia Mirkin imir...@alum.mit.edu ---
I got the demo, and even with GPU set to the lowest level, I see
lighting/texture mapping/_something_ errors. At the very first level in the
demo, if you walk towards the castle, and stand relatively close to it (but not
_too_ close), you can see the moss go from being applied to not applied to the
wall/stones, along with other lighting changes by just standing still and
turning. This was with a GF108.

I suspect that everything is a fallout from whatever issue is causing that.

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[Nouveau] [Bug 90513] Odd gray and red flicker in The Talos Principle on GK104

[bugzilla-daemon]

https://bugs.freedesktop.org/show_bug.cgi?id=90513

--- Comment #4 from Gediminas Jakutis gedimi...@varciai.lt ---
(In reply to Karol Herbst from comment #3)
 does enabling No Dynamic Lightning helps with the issue even on very high
 gpu settings Like Ultra? Its a customize options for the gpu speed.

Oh my, yes it does. 
I suppose that means the dynamic lighting is responsible for it.

Hmmm... previously[1], dynamic lighting used to crash the game at certain
locations, but would not create any visual problems. This particular flickering
started appearing after some change[2] that made the game to NOT crash anymore.

I'm going to ping the game's developers and ask them to look into this
particular report. Maybe by knowing their engine's internals, they can toss
some [valuable] insight.

[1] While the game was still in closed beta
[2] Not sure if a change to the game, to Mesa or both. As far as I can recall,
probably both.

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[Nouveau] [Bug 90513] Odd gray and red flicker in The Talos Principle on GK104

[bugzilla-daemon]

https://bugs.freedesktop.org/show_bug.cgi?id=90513

--- Comment #5 from Ilia Mirkin imir...@alum.mit.edu ---
I've made no progress on this bug BTW; perhaps an avenue would be to generate a
super-low-resolution trace (i.e. minimum supported by the game... 320x200 or
640x480 or something) so that it plays back faster, and with the minimum number
of features enabled to make the problem happen.

Basically right now every run through glretrace is a minute or longer, which is
too painful to analyze the draws. And I think I gave up waiting for llvmpipe.

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[Nouveau] [Bug 90513] Odd gray and red flicker in The Talos Principle on GK104

[bugzilla-daemon]

https://bugs.freedesktop.org/show_bug.cgi?id=90513

--- Comment #2 from Ilia Mirkin imir...@alum.mit.edu ---
Confirmed that I get redness coming in on that draw on my GK208, whereas it's
fine on i965.

There are a few awkward things, but nothing completely ridiculous:

1. 4096x4096 srgb dxt1/5 textures, specifically GL_TEXTURE4, GL_TEXTURE6.
2. Multiple vertex elements are mapped to the same position in the same buffer
(3, 4, and 5).

Curiously, no shaders appear to be bound, which is very odd. I'm guessing
that's some sort of qapitrace fail. Very weird.

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[Nouveau] [Bug 90513] Odd gray and red flicker in The Talos Principle on GK104

[bugzilla-daemon]

https://bugs.freedesktop.org/show_bug.cgi?id=90513

--- Comment #1 from Gediminas Jakutis gedimi...@varciai.lt ---
In the trace in the OP, as an example of an offending call:
on frame 1950, on call #2160519 the ground gets painted red.

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