OpenXR implementation

[MortimerGoro]

Known issues (already reported to Oculus):

• Washed out colors: Seems related to having SRGB by default or not applying VRAPI_FRAME_LAYER_FLAG_INHIBIT_SRGB_FRAMEBUFFER
• Quad and Cube layers work correctly when using FBO swapchains. But when redenring compositor layers with AndroiSurface based swapChain I get a XR_ERROR_LAYER_INVALID error when calling xrEndFrame. AndroidSurface layers are disabled until the issue is fixed.
• Reusing the instances of input XrActions with different subactionPaths for each controller on the Quest doesn't work well: the right controller reported the same pose and buttons as the left controller. I found a workaround. It works well creating different instance XrActions for each subactionPath/Controller. I'll switch back to single XrAction instances once the problem is fixed (seems a OpenXR SDK bug)

[bluemarvin]

I wonder how much effort it would take to make a noapi version using the OpenXR device. 🤔

[bluemarvin]

I think we should enable this to build on master tires to prevent bit rot.

[MortimerGoro]

I wonder how much effort it would take to make a noapi version using the OpenXR device. 🤔

We would need some loader or OpenXR runtime for noapi. I wonder if something like https://monado.freedesktop.org/ could do the job.

I think we should enable this to build on master tires to prevent bit rot.

Is user.properties path easy to support in TC?

[bluemarvin]

I wonder how much effort it would take to make a noapi version using the OpenXR device. thinking

We would need some loader or OpenXR runtime for noapi. I wonder if something like https://monado.freedesktop.org/ could do the job.

I'll take a look.

I think we should enable this to build on master tires to prevent bit rot.

Is user.properties path easy to support in TC?

I probably could support it but it would be easier if it was just another platform since I would need to run the regular builds, then set the property and then run the build just for the OpenXR build.

[bluemarvin]

Opened this issue #3447

I don't want this to bitrot from lack of building on taskcluster.