MESA Gallium driver crashes on Windows 10RT (15035)

[treeswift]

MESA (libgallium_wgl) crashes on Windows 10RT (15035).
Forking into separate issue to collect logs/dumps here.

Originally posted by @pahaze in #11 (comment)

[pahaze]

Cool, how can I help debugging here? I don't know how to create debug files with Clang.

[treeswift]

I'd say,

set LIBGL_DEBUG=verbose
set D3D12_DEBUG=verbose

and collect stdout/stderr. Should be good enough for now. Once I rebuild the dependency tree all the way down (just merged downstream from master), I'll take a look.

To generate full debug info w/CLang, pass -O0 -g and don't strip. I haven't yet looked into the binary layout produced by MinGW, but it might as well keep the debug info in the .exe/.dll themselves without spitting PDBs. Vaguely recall that it's possible.

[treeswift]

Also dxdiag.exe and capture the output.

[treeswift]

Full MESA envvar forest: https://docs.mesa3d.org/envvars.html

[pahaze]

Alright, let me turn on my Surface really quickly to get a snap of it, I'm in Windows on my desktop right now so things are a bit slower.

[treeswift]

No hurry at all, just didn't want to block anything important with this regression myself.
This https://docs.mesa3d.org/drivers/d3d12.html is a new Gallium adapter contributed by MSFT guys, I was planning to iron it out sooner than later, but focused on Qt and related things.

[pahaze]

Ah, makes sense. By the way, I think I already found the issue with the Surface. It only has FL 9_1 (should have 9_3/11_1/11_3 on the Surface 2 (what I have) AFAIK, but wasn't enabled by drivers?). I'll still attach the screenshots though. Sorry for the full screen size screenshots, don't have an external mouse/keyboard plugged in and the Type Cover's mousepad sucks.

[treeswift]

yep
https://docs.microsoft.com/en-us/windows/win32/direct3d11/overviews-direct3d-11-devices-downlevel-intro?redirectedfrom=MSDN
suggests a possible driver issue. Wondering if cloning a driver from 8.1RT might solve it?

[pahaze]

Well... Thing is, that IS the cloned driver from RT8.1 😂

[treeswift]

Ack.

[pahaze]

I would say it's interesting how ANGLE still works, but at the same time... GLES2 only needs DX9 sooo... 🤷‍♂️

[treeswift]

The d3d12 adapter was intended for full D3D12, that's why the plan to backport it.

[treeswift]

Got to qtbase. Going to be slooooow...

[pahaze]

You're not using more than one job? 🤔

[treeswift]

I am sending -j (implicit scaling) everywhere, right now all my 4 cores are busy. (100%=4 cores, 25%=1 core on the screenshot)