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Explainer

The GPUCanvasContext getConfiguration() method returns the canvas context
configuration. https://github.com/gpuweb/gpuweb/pull/4899

Specification
https://gpuweb.github.io/gpuweb/#dom-gpucanvascontext-getconfiguration

Summary

Functionality added to the WebGPU spec after its first shipment in a
browser. Once GPUCanvasContext configure() has been called with a
configuration dictionary, the GPUCanvasContext getConfiguration() method
lets developers check the canvas context configuration. It includes GPU
device, format, usage, viewFormats, colorSpace, toneMapping, and alphaMode
members. As discussed in https://github.com/gpuweb/gpuweb/issues/4828, web
apps can use it to detect whether HDR canvas is supported in WebGPU.


Blink componentBlink>WebGPU
<https://bugs.chromium.org/p/chromium/issues/list?q=component:Blink%3EWebGPU>

TAG reviewNone

TAG review statusPending

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
https://github.com/gpuweb/gpuweb/wiki/GPU-Web-2024-09-18#m1-feature-detection-for-hdr-canvas-4828


*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/4828#issuecomment-2330181314

*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
<https://chromium.googlesource.com/chromium/src/+/main/docs/testing/web_platform_tests.md>
?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/3973


Flag name on chrome://flagschrome://flags/#enable-unsafe-webgpu

Finch feature nameWebGPU.Enabled:UnsafeFeatures

Requires code in //chrome?False

Tracking bughttps://issues.chromium.org/issues/370109829

Estimated milestones
Shipping on desktop 131
Shipping on Android 131

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/6195110870777856?gate=5109106965479424

This intent message was generated by Chrome Platform Status
<https://chromestatus.com/>.

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