[webkit-dev] Position on WebXR dynamic viewport scaling

Klaus Weidner klausw at chromium.org
Mon Jan 11 18:31:16 PST 2021

[+Dean Jackson since it's WebXR related]

Hello WebKit,

I'd like to ask for WebKit's position on the dynamic viewport scaling
feature that's part of the WebXR API. This is intended to let applications
render to a subset of the full viewport and adjust that scale on a
per-frame basis if needed to reach target framerates.

Specification: Part of WebXR, see for example
TAG review request: https://github.com/w3ctag/design-reviews/issues/588

This was discussed in https://github.com/immersive-web/webxr/issues/1091
and multiple calls with the immersive-web group. The changes were merged
into the main specification via
https://github.com/immersive-web/webxr/pull/1132 , but to the best of my
knowledge this hasn't been launched in any other browser yet.

Could I get your position on this?

For context, the goal is that this API is optional for UAs. It would be a
valid implementation to provide a requestViewportScale method that does
nothing. If it is supported, the UA can optionally provide a
recommendedViewportScale numeric attribute based on internal heuristics,
but it's also valid to keep that undefined.

Thank you,

Klaus Weidner
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