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add event type for mask visibility #1415

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Merged
cabanier merged 2 commits into from
Oct 1, 2025
Merged

add event type for mask visibility #1415

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9cd4975
add event type for mask visibility
cabanier Oct 1, 2025
758fe65
address review comment
cabanier Oct 1, 2025
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2 changes: 2 additions & 0 deletions index.bs
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Expand Up @@ -2669,6 +2669,8 @@ A user agent MUST [=fire an event=] named <dfn event for="XRSession">squeeze</df

A user agent MUST [=fire an event=] named <dfn event for="XRSession">frameratechange</dfn> using {{XRSessionEvent}} on an {{XRSession}} when the [=XR Compositor=] changes the {{XRSession}}'s [=XRSession/internal nominal framerate=].

A user agent MUST [=fire an event=] named <dfn event for="XRSession">visibilitymaskchange</dfn> using {{XRVisibilityMaskChangeEvent}} on an {{XRSession}} when the [=XRSystem=] wants to signal a change to the visible region of the {{XRView}} that is displayed to the user.

A user agent MUST [=fire an event=] named <dfn event for="XRReferenceSpace">reset</dfn> using {{XRReferenceSpaceEvent}} on an {{XRReferenceSpace}} when discontinuities of the [=native origin=] or [=effective origin=] occur, i.e. there are significant changes in the origin’s position or orientation relative to the user’s environment. (For example: After user recalibration of their XR device or if the XR device automatically shifts its origin after losing and regaining tracking.) A {{reset}} event MUST also be dispatched when the {{boundsGeometry}} changes for an {{XRBoundedReferenceSpace}}. A {{reset}} event MUST NOT be dispatched if the [=viewer=]'s pose experiences discontinuities but the {{XRReferenceSpace}}'s origin physical mapping remains stable, such as when the [=viewer=] momentarily loses and regains tracking within the same tracking area. A {{reset}} event also MUST NOT be dispatched as an {{unbounded}} reference space makes small adjustments to its [=native origin=] over time to maintain space stability near the user, if a significant discontinuity has not occurred. The event MUST be dispatched prior to the execution of any [=XR animation frame=]s that make use of the new origin. A {{reset}} event MUST be dispatched on all offset reference spaces of a reference space that fires a {{reset}} event, and the {{boundsGeometry}} of offset {{XRBoundedReferenceSpace}}s should also be recomputed.

Note: This does mean that the session needs to hold on to strong references to any {{XRReferenceSpace}}s that have {{XRReferenceSpace/reset}} listeners.
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