Immersive Web Working Group Teleconference - 2019-10-22

Pre-email note: Check out the bottom of the agenda for issues which are
looking for help.
Call Agenda

This agenda can be viewed and updated on Github
<https://github.com/immersive-web/administrivia/blob/master/meetings/wg/2019-10-22-Immersive_Web_Working_Group_Teleconference-agenda.md>
.

If you would like to add an item to the agenda or volunteer to scribe
please open a pull request against this agenda.

There are a lot of issues this week I don't think we'll be able to tackle
all of them.

   - Discussion about XRSessionModes:
   immersive-web/webxr-ar-module/issues/28
   <https://github.com/immersive-web/webxr-ar-module/issues/28>,
   immersive-web/webxr-ar-module/pull/38
   <https://github.com/immersive-web/webxr-ar-module/pull/38> (Manish)

Finalize the enum move
<https://github.com/immersive-web/webxr-ar-module/pull/38>, and
discuss Brandon's
comment about having two immersive modes
<https://github.com/immersive-web/webxr-ar-module/issues/28#issuecomment-540811746>


   - webxr-ar-module#29 Should handheld and headset AR use the same
   XRSessionMode?
   <https://github.com/immersive-web/webxr-ar-module/issues/29> +
webxr-ar-module#9
   Enable developers to distinguish between screen-based and head-worn sessions
   <https://github.com/immersive-web/webxr-ar-module/issues/29> (Manish)

Discuss how best to expose that the UI is screen-based vs headworn, and
whether or not we should block on DOM overlay.


   - webxr-gamepads-module#18 Ensure that the returned gamepad object is
   live <https://github.com/immersive-web/webxr-gamepads-module/issues/18>,
requested
   by NellWaliczek
   <https://github.com/immersive-web/webxr-gamepads-module/issues/18#issuecomment-540758145>

Adding to the agenda to confirm the expected behavior from the Gamepad
folks and get consensus on which approach we intend to take.


   - webxr-input-profiles#79 Do fallback profiles need to contain only
   subset of componenents?
   <https://github.com/immersive-web/webxr-input-profiles/issues/79> requested
   by NellWaliczek
   <https://github.com/immersive-web/webxr-input-profiles/issues/79#issuecomment-540135141>

Filed #100 to specifically address the Oculus Touch profile.

To gather opinions on what the general guidelines ought to be


   - webxr-input-profiles#82 UA reserved buttons
   <https://github.com/immersive-web/webxr-input-profiles/issues/82> requested
   by NellWaliczek
   <https://github.com/immersive-web/webxr-input-profiles/issues/82#issuecomment-540136280>

I'll take a poke at the right schema changes to support tracking this in
the registry. In the meanwhile...

To learn which buttons should be documented as reserved for each profile


   - webxr-input-profiles#14 Add behavior for unknown gamepads
   <https://github.com/immersive-web/webxr-input-profiles/issues/14> requested
   by NellWaliczek
   <https://github.com/immersive-web/webxr-input-profiles/issues/14#issuecomment-544731669>

When this issue was originally filed, we were still figuring out the
details of the profiles attribute. Now that we've gotten further along, a
few other things should be considered:

   1. In some cases the UA will be unable to identify a vendor-prefixed
   string. Should profiles = [] in that case? What if a generic prefixed
   string can be identified?
   2. In some cases the UA will allow users to hide the actual
   vendor-prefixed information. Should profiles=[] or should a generic be
   reported? If so, is it up to the UA to decide how specific that generic is
   (i.e. if generic-trigger-grip is valid, should generic-trigger ever be
   returned?)
   3. If we decide to add squeeze events, does the profiles array need to
   indicate that this event can be fired?
   4. If we allow profiles to be an empty array, do we have any concerns
   about developers falling into a pit of failure?
   5. Is there any situation in which "" would be a valid profile id?

<https://github.com/immersive-web/administrivia/blob/master/meetings/wg/2019-10-22-Immersive_Web_Working_Group_Teleconference-agenda.md#immersive-web-working-group-teleconference---2019-10-22>Immersive
Web Working Group Teleconference - 2019-10-22
San Francisco (U.S.A. - California) Tuesday, October 22, 12:00 PM PDT
Boston (U.S.A. - Massachusetts) Tuesday, October 22, 3:00 PM EDT
London (United Kingdom - England) Tuesday, 22 October, 20:00 BST
Paris (France) Tuesday, 22 October, 21:00 CEST
Tokyo (Japan) Wednesday, 23 October, 04:00 GMT+9
Corresponding UTC (GMT) Tuesday, 22 October, 19:00 UTC
<https://github.com/immersive-web/administrivia/blob/master/meetings/wg/2019-10-22-Immersive_Web_Working_Group_Teleconference-agenda.md#logistics>
Logistics

Chair: Chris Wilson, Ada Rose Cannon

Scribe:

IRC: irc.w3.org:6667 #immersive-web Instructions
<https://github.com/immersive-web/administrivia/blob/master/IRC.md>

Call Details can be found on the Internal Mailing List
<https://lists.w3.org/Archives/Member/internal-immersive-web/2019Feb/0002.html>

If you are unable to login to view the call details please ask on the IRC
before the call.

For assistance go to mit.webex.com/mit/mc and on the left navigation bar,
click "Support".
<https://github.com/immersive-web/administrivia/blob/master/meetings/wg/2019-10-22-Immersive_Web_Working_Group_Teleconference-agenda.md#help-wanted>Help
Wanted

Here are some issues which are good issues to get involved in, if you have
taken responsibility for one leave a comment in the issue:

   - webxr#225 Behavior of window.requestAnimationFrame and
   window.requestIdleCallback when presenting
   <https://github.com/immersive-web/webxr/issues/225>
   - webvr-polyfill-dpdb#34 Create a helper script/web page for generating
   values for a new device
   <https://github.com/immersive-web/webvr-polyfill-dpdb/issues/34>
   - webxr#603 What happens if a canvas with an xrCompatible context is
   attached to the DOM? <https://github.com/immersive-web/webxr/issues/603>
   - webxr#679 Consider removing XRWebGLLayer's context attribute
   <https://github.com/immersive-web/webxr/issues/679>
   - webxr#736 Should calling XRSession.requestAnimationFrame in a
   Window.animationFrameCallback be banned?
   <https://github.com/immersive-web/webxr/issues/736>
   - webxr#776 Remove unnecessary or redundant information from "Security,
   Privacy, and Comfort Considerations"
   <https://github.com/immersive-web/webxr/issues/776>
   - webxr-input-profiles#69 Resizing the window changes the model viewer's
   aspect ratio
   <https://github.com/immersive-web/webxr-input-profiles/issues/69>
   - webxr-gamepads-module#16 Add link to the registry
   <https://github.com/immersive-web/webxr-gamepads-module/issues/16>
   - webxr#854 Result of calling checkFramebufferStatus on an opaque
   framebuffer <https://github.com/immersive-web/webxr/issues/854>
   - webxr#856 Do opaque framebuffers have a reference to their XR session?
   <https://github.com/immersive-web/webxr/issues/856>
   - webxr#860 What is a "valid feature descriptor"
   <https://github.com/immersive-web/webxr/issues/860>
   - webxr#877 Note somewhere that you should be always be queueing up the
   next rAF within rAF <https://github.com/immersive-web/webxr/issues/877>
   - webxr#880 Corrections and clarifications for description/steps for
   updateRenderState() <https://github.com/immersive-web/webxr/issues/880>
   - webxr#891 Clarify semantics of preserveDrawingBuffer
   <https://github.com/immersive-web/webxr/issues/891>