Intent to Ship: WebGPU: copyBufferToBuffer overload
François Beaufort
Contact emails
Explainer
To simplify the copy of entire buffers, a new overload has been added to the GPUCommandEncoder copyBufferToBuffer() method, allowing developers to omit offsets and size parameters.
https://github.com/gpuweb/gpuweb/pull/5098
Specification
https://gpuweb.github.io/gpuweb/#dom-gpucommandencoder-copybuffertobuffer
Summary
Functionality added to the WebGPU spec after its first shipment in a browser.
The GPUCommandEncoder copyBufferToBuffer() method now includes a simpler way to copy entire buffers using a new overload with optional offsets and size parameters.
Blink component
TAG review
None
TAG review status
Not applicable
Risks
Interoperability and Compatibility
This feature has not yet been implemented in any browser. It has been approved by the GPU for the Web Community Group, with representatives from Chrome, Firefox, and Safari. See minutes at
Gecko: No signal (Mozilla members have requested during weekly standardization meetings that we postpone filing standard positions until we reach Candidate Recommendation (CR) status in Q4.)
WebKit: Positive (https://github.com/WebKit/standards-positions/issues/294#issuecomment-1877411933)
Web developers: Positive (https://github.com/gpuweb/gpuweb/issues/4807)
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?
None
Debuggability
None
Will this feature be supported on all six Blink platforms (Windows, Mac, Linux, ChromeOS, Android, and Android WebView)?
No
All platforms will eventually have support. Will immediately be available on Android, Android WebView, ChromeOS, Mac, and Windows, since those platforms already support WebGPU. Linux is planned to have WebGPU support in the future, so this feature will become available when WebGPU does.
Is this feature fully tested by web-platform-tests?
Yes
WebGPU/WGSL have a conformance test suite (https://github.com/gpuweb/cts) that is regularly pulled into Chromium and part of the testing of Dawn/Tint in Chromium. While the CTS can be embedded in WPT, the WebGPU team opted to keep it separate in Chromium testing to use a customized harness for robustness and performance. All the tests about this feature in WebGPU CTS can be found through the below link:
https://github.com/gpuweb/cts/pull/4310
Flag name on chrome://flags
Experimental Web Platform Features
Finch feature name
WebGPUCopyBufferToBufferOverload
Requires code in //chrome?
False
Tracking bug
https://issues.chromium.org/issues/405883444
Estimated milestones
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).
None
Link to entry on the Chrome Platform Status
https://chromestatus.com/feature/5172397000622080?gate=5107250466914304
This intent message was generated by Chrome Platform Status.
Alex Russell
Daniel Bratell
LGTM2
/Daniel
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Domenic Denicola
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