[Bug 110395] Shadows are flickering in SuperTuxKart

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=110395

--- Comment #13 from Denis <denys.kostin at globallogic.com> ---
@Deve - 
>I can "fix" this by changing order of the "layer" and "wind_direction" uniform variables. Maybe it's just a case.

Does it fix bisected by you commit (from Danylo)?
I made bisection one more time (and now I think that it was the most correct),
but I did what you suggested (first line in shader is "wind_dircection", second
- "layer".

As I wrote before, this issue is completely random. It can be reproduced, like,
1/5, or even 1/10 launches. Sometimes - 1 time from 2 launches.

So, 17.3.6 was stable (I did about 50 launches or even more), and 18.3.4 - with
an issue. Also issue existed in 19.0.0-rc7 (simply I had them compiled).

And result of bisection also lead me to Danylo's commit.
>you may want MESA_EXTENSION_OVERRIDE="-GL_ARB_buffer_storage" apitrace trace bin/supertuxkart

thanks a lot! It helped and I made an apitrace.
I will discuss my results with Danylo when he will be available.

>This is on my Intel skylake system (HD520).
Very interesting. I made an apitrace, and ran it on SKL (fedora 29) about 10
times. Didn't see flickerings.
Also I checked app (and apitrace) on my KBL - with 19.0 mesa version - also
nothing.

Could you please check apitrace I did?
https://drive.google.com/open?id=1hTRS3tgBuSOSNiFGoy7JaLVKkVeNmwb0

UDP - everything I did, was maden on:
Fedora 29
HSW cpu

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