Supported Session Features Table and requestSession with promises

[TiborUdvari]

I'm creating a page where one can see which features of immersive sessions are available. Does this already exist somewhere? I would prefer to link to it.

I'm trying to cycle through creating an immersive-ar and immersive-vr session with one session feature each time, as listed in the MDN docs. If the session creation is successful, the feature is supported. Is there a more straightforward way of achieving this?

I'm trying to use Promises and async-await, which works well in the simulator. However, on the Meta Quest 3 device I own, whenever any promise seems to be involved with requestSession, it just hangs and never returns. I wanted to document this here in case anyone else runs into this behavior. Please redirect me anywhere else if there is a more appropriate place to ask this question.

Context: I'm working on p5.xr, and I think it's a little tricky ATM for people to be able to query what capabilities their devices have

Here is a snippet I tried to wrap, which never returns either a session or an error:

function requestSessionPromise(mode, feature) {
  return new Promise((resolve, reject) => {
    if (!navigator.xr) {
      reject(new Error('navigator.xr non existent'));
    }
    navigator.xr
      .requestSession(mode, { requiredFeatures: [feature] })
      .then(
        (session) => {
          resolve(session);
        },
        (error) => {
          reject(error);
        },
      );
  });
}

[Maksims]

I think you can make a single request with all features as optionalFueatures array, and then check a session's enabledFeatures list of what is supported.

[AdaRoseCannon]

https://immersiveweb.dev/#supporttable should be an up to date table. If you find mistakes please make a pull request.

[TiborUdvari]

Thanks for the feedback! I was looking for a way to test features on the current device, the way that was suggested by @Maksims works best for that. Although if the whole session fails to start for some reason, there is no meaningful info, so I also added buttons for each mode - session feature combination as a fallback.

The support table is also a valuable resource, thank you @AdaRoseCannon

Here is the result: https://p5xr.org/#/webxr-test.html

After refactoring for not using Promises, I found that I was getting a Security error relating to not starting an XRSession from a user event. I was trying to start the next one from the end event of the previous one. Weird that it failed silently with promises.