[Bug 93840] [i965] Compiler backend uses too much stack with Alien: Isolation

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=93840

--- Comment #35 from Darius Spitznagel <d.spitznagel at goodbytez.de> ---
(In reply to _archuser_ from comment #34)
> FYI:
> Mesa 17.0.1 on Haswell with Kernel 4.10.1 on arch:
> 
> Without overrides I get the incompatibility warning and crash while loading
> the menu, by disabling the shader prewarmer in
> ~/.local/share/feral-interactive/AlienIsolation/preferences
> (EnableShaderWarmer / EnableShaderWarmerPredraw = 0) the game starts and is
> playable (very fast load times, bad hickups as in game shaders are compiled
> on the fly?)
> The prewarmer seems to compile all shaders for the game in one go, maybe
> that is a reason for such a huge running shader program ?

I can confirm it's working without Matts patch this way.
Now I need less than 1 minute to get into game from save.
You are right... now some shaders get compiled when needed on the fly when you
enter some rooms/floors and cause stuttering.

I also see the little flashing white boxes I have reported in comment 15.
It seems something is not rendered correctly?!
I will try enabling/disabling some effects and report back.

The only difference is that I don't get an incompatibility warning and I also
use Mesa 17.0.1 now.
My kernel is 4.9.13 on Haswell Iris Pro 5200.

Eero, could you check your Skylake system with "EnableShaderWarmer" and
"EnableShaderWarmerPredraw" set to 0 (disabled)?

Nice catch _archuser_:)

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