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Explainer https://github.com/explainers-by-googlers/webgpu-compatibility-mode/blob/main/README.md Specification https://github.com/gpuweb/gpuweb/blob/main/proposals/compatibility-mode.md Summary Adds an opt-in, lightly restricted subset of the WebGPU API capable of running older graphics APIs such as OpenGL and Direct3D11. By opting into this mode and obeying its constraints, developers can extend the reach of their WebGPU applications to many older devices that do not have the modern, explicit graphics APIs that core WebGPU requires. For simple applications, the only required change is to specify the "compatibility" featureLevel when calling requestAdapter. For more advanced applications, some modifications may be necessary to accommodate the mode's restrictions. Since Compatibility mode is a subset, the resulting applications are also valid WebGPU Core applications and will run even on user agents that do not support Compatibility mode. Blink component Blink>WebGPU TAG review https://github.com/w3ctag/design-reviews/issues/1063 TAG review status Pending Origin Trial documentation link https://github.com/explainers-by-googlers/webgpu-compatibility-mode/blob/main/README.md Risks Interoperability and Compatibility This feature has been approved in W3C GPU for the Web WG meetings including participants from Safari and Firefox. Gecko: Positive Although there is not currently an entry for Compatibility Mode in the standards positions repos, WebGPU Compatibility Mode was discussed and approved by Google, Apple and Mozilla in the GPU for the Web Working Group, and has the same support as WebGPU Core. Each of the commits to the compatibility-mode propsal above was approved by a working group member from each of those three organizations, and any disagreements were resolved prior to landing in Working Group meetings. WebKit: Positive Although there is not currently an entry for Compatibility Mode in the standards positions repos, WebGPU Compatibility Mode was discussed and approved by Google, Apple and Mozilla in the GPU for the Web Working Group, and has the same support as WebGPU Core. Each of the commits to the compatibility-mode propsal above was approved by a working group member from each of those three organizations, and any disagreements were resolved prior to landing in Working Group meetings. Web developers: No signals Other signals: Security Being a lightly-restricted subset, Compatibility Mode does not introduce any accessibility, security, or privacy issues over and above those introduced by core WebGPU. For this reason, the security review submitted for WebGPU also applies to Compatibility Mode. 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 Goals for experimentation Ongoing technical constraints 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, where hardware support is available. 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 All Compatibility Mode restrictions are exercised by the "compatibility" option to the WebGPU CTS. Eg, https://gpuweb.github.io/cts/standalone/?compatibility=1&q=webgpu:* This subset is tested extensively on the Dawn CI (https://ci.chromium.org/p/chromium/g/chromium.dawn/console) under the "webgpu_cts_compat_tests" suite. 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. Flag name on about://flags None Finch feature name WebGPUCompatibilityMode Requires code in //chrome? False Tracking bug https://issues.chromium.org/issues/40266903 Estimated milestones Origin trial desktop first 139 Origin trial desktop last 145 Origin trial Android first 139 Origin trial Android last 145 Origin trial WebView first 139 Origin trial WebView last 145 Link to entry on the Chrome Platform Status https://chromestatus.com/feature/6436406437871616?gate=5369684226211840 This intent message was generated by Chrome Platform Status. -- You received this message because you are subscribed to the Google Groups "blink-dev" group. To unsubscribe from this group and stop receiving emails from it, send an email to blink-dev+unsubscr...@chromium.org. To view this discussion visit https://groups.google.com/a/chromium.org/d/msgid/blink-dev/683618d7.170a0220.2aa17e.17c5.GAE%40google.com.
