bugfix(server_openvr, linux): Fix intel graphics failing to run ALVR

[Meister1593]

Fixes #2014

Known issues around intel graphics in alvr:

• Software encoding doesn't work (crashes steamvr)
• Quality looks different compared to vaapi on amd, might be issues with parameters passed to ffmpeg (compression doesn't seem to affect it much)
• Games still don't work (they appear to have tracking, but not showing up inside steamvr), but it might be unrelated issue

Tested on Intel Arc laptop graphics (intel ultra 9)

[Meister1593]

huh
clang-format check failed for /home/runner/work/ALVR/ALVR/alvr/server_openvr/cpp/alvr_server/Controller.h
i think theres some problems with check format and format in xtasks, since i used it to format

[The-personified-devil]

clang-format sometimes behaves slightly different in specific instances between versions and in that case you probably have a different version than actions has. (Tho an actual diff and not just a failure message might be slightly nicer.) Just remove the changes from that file and that should go away.

[The-personified-devil]

Sorry that this is such a drag, I should've just done it myself in 5 minutes when I originally commented on that issue, I was just too lazy (nvm that it's just plain annoying as you can see). But it's complex to get this right in C++, so see this as a learning opportunity I guess.

[Meister1593]

Sorry that this is such a drag, I should've just done it myself in 5 minutes when I originally commented on that issue, I was just too lazy (nvm that it's just plain annoying as you can see). But it's complex to get this right in C++, so see this as a learning opportunity I guess.

Yeah i mostly wanted to make sure it at least works on intel and see if i can do something in this part of codebase, even though with help. Don't worry about the drag

[Meister1593]

One more note: while it seems like alvr and steamvr works, some (maybe all?) vr games seem to not display inside vr.
Might be separate bug, but probably needs investigating to make it fully playable

[Meister1593]

In either case, i think alvr at least started to work with steamvr, i think it can be merged as at least partial support
I might test with older vulkan driver for intel too, just to make sure if it will work

[The-personified-devil]

I know I'm kinda reviewing my own code, but LGTM. I think the most value would actually be testing by nvidia users, but fwiw we can just do that via nightlies.

[zmerp]

I can't say anything about the content of the PR, but no problems about style