Intent to Ship: WebGPU: `subgroup_uniformity` feature

[Chromestatus]

Contact emails

alan...@google.com

Explainer

No information provided

Specification

https://github.com/gpuweb/cts/pull/4516

Summary

Functionality added to the WebGPU spec after its first shipment in a browser. Adds a new scope to the uniformity analysis and changes which parts of the language are checked in each to allow subgroup functionality to be considered uniform in more cases.

Blink component

Blink>WebGPU

Web Feature ID

webgpu

Motivation

This feature allows subgroup functionality to be considered uniform in more cases representing better quality-of-life for developers and less likelihood of disabling uniformity checks altogether.

Initial public proposal

No information provided

TAG review

No information provided

TAG review status

Pending

Risks

Interoperability and Compatibility

Approved as a WebGPU language feature at W3C. Meetings include participants from Firefox and Safari.

Gecko: No signal (https://github.com/mozilla/standards-positions/issues/1205#issuecomment-3312534193)

WebKit: Closed Without a Position (https://github.com/WebKit/standards-positions/issues/294#issuecomment-1877411933)

Web developers: No signals

Other signals:

WebView application risks

Does this intent deprecate or change behavior of existing APIs, such that it has potentially high risk for Android WebView-based applications?

No information provided

Debuggability

No information provided

Will this feature be supported on all six Blink platforms (Windows, Mac, Linux, ChromeOS, Android, and Android WebView)?

Yes
All platforms will eventually have support. Will immediately be available on Android, Android WebView, ChromeOS, Mac, and Windows, since those platforms already support WebGPU. WebGPU will also start shipping on Linux in M145 on some devices, so this feature will become available when WebGPU does.

Is this feature fully tested by web-platform-tests?

Yes
WebGPU conformance tests were added in https://github.com/gpuweb/cts/pull/4516

Flag name on about://flags

Enable Unsafe WebGPU

Finch feature name

UnsafeWGSLFeatures

Rollout plan

Will ship enabled for all users

Requires code in //chrome?

False

Tracking bug

https://crbug.com/454653380

Estimated milestones

Shipping on desktop	145
Shipping on Android	145
Shipping on WebView	145

Anticipated spec changes

Open questions about a feature may be a source of future web compat or interop issues. Please list open issues (e.g. links to known github issues in the project for the feature specification) whose resolution may introduce web compat/interop risk (e.g., changing to naming or structure of the API in a non-backward-compatible way).

No information provided

Link to entry on the Chrome Platform Status

https://chromestatus.com/feature/5673998232977408?gate=5020649787621376

This intent message was generated by Chrome Platform Status.

[Alan Baker]

Apologies, I had the wrong link in the spec link section. I've updated it, but it should be https://github.com/gpuweb/gpuweb/pull/5431.

Alan

[Mike Taylor]

LGTM1

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