Feature Request

Yes, sorry, that's how I intended it. My point was right now Proton does things specifically for SteamVR and those things don't work if you have the runtime set to Monado, or presumably any other non-SteamVR OpenXR runtime.

I would also like to express my support of this request - SteamVR is not as performant or reliable on Linux as Monado at this point , and feels somewhat neglected. So for titles that run in proton, I would like to be able to use Monado instead of steamVR, at least until your steamVR team at valve gets its act together regarding Linux.

Would be kinda neat to see valve contribute to monado and use it over the current OpenXR runtime that steam provides, but thats neither here nor there.

Hi @Supreeeme. I'm also trying to get a game working via Lutris -> Proton-GE (7-35) -> OpenXR -> Monado, namely the DCS World Beta which supposedly has OpenXR support: https://forum.dcs.world/topic/318004-dcs-now-supports-openxr-natively/

But even with:

$ ln -s /usr/share/openxr/1/openxr_monado.json ~/.config/openxr/1/active_runtime.json
$ cat ~/.config/openxr/1/active_runtime.json
{
    "file_format_version": "1.0.0",
    "runtime": {
        "library_path": "../../../lib/libopenxr_monado.so"
    }
}

I see no BEGIN_SESSION or any reaction on "XRT_COMPOSITOR_LOG=debug monado-service" when I start DCS World Beta.

How did you set these registry keys, in which path and to which values did you set them? Via Lutris and the game's "Wine Registry" menu I can't find neither "state", "openxr_vulkan_instance_extensions" nor "openxr_vulkan_device_extensions".

The "hello_xr" application from the libopenxr-utils package on Debian Sid works fine for me via monado-service. Which windows OpenXR apps were you able to run through Proton + Monado? Any non-steam, standalone, small OpenXR windows demo apps you can recommend for first tries?

It seems that people were able to get DCS World running via Steam -> Proton -> OpenVR -> OpenOVR -> OpenXR -> Monado: https://github.com/ValveSoftware/Proton/issues/1722#issuecomment-1304850881

But it would be great to be able to skip the OpenOVR layer for OpenVR to OpenXR translation. Especially as Monado is directly available on Debian while OpenOVR is not and would need a manual installation.

Edit: The error I'm seeing from Proton on the console is the following when I try to run DCS World Beta:

...
Error [GENERAL |  | OpenXR-Loader] : RuntimeManifestFile::FindManifestFiles - failed to find active runtime file in registry
Error [GENERAL | xrEnumerateInstanceExtensionProperties | OpenXR-Loader] : RuntimeInterface::LoadRuntimes - unknown error
Error [GENERAL | xrEnumerateInstanceExtensionProperties | OpenXR-Loader] : RuntimeInterface::LoadRuntimes - failed to load a runtime
Error [GENERAL | xrEnumerateInstanceExtensionProperties | OpenXR-Loader] : Failed to find default runtime with RuntimeInterface::LoadRuntime()
Error [GENERAL | xrEnumerateInstanceExtensionProperties | OpenXR-Loader] : Failed querying extension properties
Error [GENERAL |  | OpenXR-Loader] : RuntimeManifestFile::FindManifestFiles - failed to find active runtime file in registry
Error [GENERAL | xrEnumerateInstanceExtensionProperties | OpenXR-Loader] : RuntimeInterface::LoadRuntimes - unknown error
Error [GENERAL | xrEnumerateInstanceExtensionProperties | OpenXR-Loader] : RuntimeInterface::LoadRuntimes - failed to load a runtime
Error [GENERAL | xrEnumerateInstanceExtensionProperties | OpenXR-Loader] : Failed to find default runtime with RuntimeInterface::LoadRuntime()
Error [GENERAL | xrEnumerateInstanceExtensionProperties | OpenXR-Loader] : Failed querying extension properties
...

So this seems indeed related to the missing registry keys?

Maybe @aeikum / @ColdPie1 or @gofmanpe, who seem to have worked on the OpenXR implementation in Proton and DXVK, might have some ideas on what would need to be done for this ticket? (and many thanks to you guys for your work on this so far!)

@T-X Could you try to change the relative path in active_runtime.json to be pointing to the library relative to ~/.config/openxr/1. The path you have when you just link to the file in /usr/share/... should not be valid from ~/.config/openxr/1.

@farmboy0 I don't quite understand your remark. hello_xr works fine with what's set in my ~/.config/openxr/1/active_runtime.json / the ~/.local/share/openxr/1/openxr_monado.json it symlinks to.

Also I was now able to manually configure everything in a Lutris installed OpenXR game. And have documented the steps I needed here: https://github.com/TheZoq2/dcs_on_linux/issues/26#issuecomment-1528227256.

So I guess the ultimate goal of this ticket would be to make all these extra steps superfluous?

@T-X The problem is that proton runs in a container, so its not quite the same as running wine standalone. And to make the container work with monado you need to make sure the container can see everything you need to comminucate with Monado which runs outside the container.

I'm gonna close this because I've already solved my usecase:
This commit enables OpenXR games to launch without SteamVR through Monado + OpenComposite. Note that although OpenComposite is for OpenVR games, Proton uses OpenVR to initialize OpenXR games, so that is the only time OpenComposite will be active (during initialization). There are some other issues with using OpenComposite (specifically if you set it as your openvr runtime and try to play a non-VR game) but those are OpenComposite issues, not Proton.

@Coreforge If I had to guess you're missing the XR_RUNTIME_JSON variable. The OpenComposite readme has a linux specific section going over this. You may also be interested in Envision, which simplifies OpenComposite + Monado setup.