[GB-206] Set up an OpenXR Runtime for Game Bridge

[BramTeurlings]

To make UEVR work with SR through OpenXR, a specialized runtime is needed. SR Hydra is not built in a way that supports the experience we have in mind for gaming in SR.

Criteria minimal running application:

• Can connect with a test application
• Can render a single view to a window
• DX12

It should not support:

• Input

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Originally reported by , imported from: Set up an OpenXR Runtime for Game Bridge

• assignee:
• status: Done
• priority: Medium
• resolution: Complete
• resolved: 2024-02-19T03:37:26-08:00
• imported: 2024-04-04

[BramTeurlings]

607809585759fb0069a89817:

So far there is an implementation for:

• Instance
• system
• session
• action sets
• actions
• d3d12 swapchain
• views
• spaces

Some of these are not complete or untested since I have to implement function in the order of the client application calling the functions. This makes it quite difficult to know beforehand what feature I'm working on.

Currently I am working on the event system for the OpenXR Runtime. The plan is to use the event manager from the 3D Game Bridge for that.

[BramTeurlings]

607809585759fb0069a89817:

• Implemented a part of the event system
• Can communicate a session change to the client through the event system
• Implemented XrBeginSession
• continuing actions

[BramTeurlings]

712020:f91dd24e-5296-4a9d-90d9-b287c639e252:

Skipped actions since I don’t think we need them for now, it’s more important we have something on screen.

Started with frame synchronization

[BramTeurlings]

607809585759fb0069a89817:

Implemented a part of frame synchronization, not working at the moment

[BramTeurlings]

712020:f91dd24e-5296-4a9d-90d9-b287c639e252:

For 13/2/24: Implemented more frame synchronisation in the swapchain and dummy implementation of locate spaces

[BramTeurlings]

712020:f91dd24e-5296-4a9d-90d9-b287c639e252:

Changed the criteria to be smaller for this task.

Will make more ticket for this for better tracking of progress

[BramTeurlings]

712020:f91dd24e-5296-4a9d-90d9-b287c639e252:

This ticket goes up to commit: `Presenting the application image works, started on multiple swapchain` 71b34b6d2b68f456f692c1ac87c5e7d04545c50b

Branch: feature/openxr-runtime

[BramTeurlings]

712020:f91dd24e-5296-4a9d-90d9-b287c639e252:

Minimal running openxr runtime using the resources (device and queue) from the application

[BramTeurlings]

712020:c26664a4-c3de-4473-a0b4-5a76804d5628:

I've looked through the code with Joey and somewhat understand the flow of the application. It makes sense to me and looks good.

[BramTeurlings]

712020:c26664a4-c3de-4473-a0b4-5a76804d5628:

Apart from quite a bit of polish and documentation (not to mention TODO statements missing), this is fine for a prototype.