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Explainer https://github.com/gpuweb/gpuweb/blob/main/proposals/transient-attachments.md Specification https://gpuweb.github.io/gpuweb/#dom-gputextureusage-transient_attachment Summary Functionality added to the WebGPU spec after its first shipment in a browser. A new TRANSIENT_ATTACHMENT GPUTextureUsage lets developers create attachments that allow render pass operations to stay in tile memory, avoiding VRAM traffic and potentially avoiding VRAM allocation for the textures. Blink component Blink>WebGPU Web Feature ID webgpu Motivation When a texture is declared transient (or "memoryless"), the GPU knows that the contents of that texture are only needed temporarily—specifically, only within the current render pass. Moreover, since the texture contents are discarded after the render pass, the driver may not even need to allocate space for that texture in the main VRAM at all. Even without hardware support for transient attachments, the hint can be used to reuse the allocation of transient textures between passes, which reduces peak memory usage. https://github.com/gpuweb/gpuweb/pull/5450 Initial public proposal No information provided TAG review No information provided TAG review status Not applicable Risks Interoperability and Compatibility This feature has not yet been implemented yet 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-2025%E2%80%9011%E2%80%9005#add-support-for-memoryless-textures-5396 Gecko: No signal (https://github.com/mozilla/standards-positions/issues/1205#issuecomment-3312534193) wgpu used by Firefox already has transient attachments support. See https://github.com/gfx-rs/wgpu/pull/8247 WebKit: Closed Without a Position (https://github.com/WebKit/standards-positions/issues/294#issuecomment-1877411933) Apple representative approved the spec PR at https://github.com/gpuweb/gpuweb/pull/5450#pullrequestreview-3574410798 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 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 at https://github.com/gpuweb/cts/issues/4509 Flag name on about://flags Enable Unsafe WebGPU Finch feature name WebGPUTransientAttachment Rollout plan Will ship enabled for all users Requires code in //chrome? False Tracking bug https://issues.chromium.org/issues/462620664 Estimated milestones DevTrial on desktop 146 DevTrial on Android 146 Anticipated spec changes Open questions about a feature may be a source of future web compat or interop issues. Please list open issues (eg links to known github issues in the project for the feature specification) whose resolution may introduce web compat/interop risk (eg, 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/5562829589577728?gate=6588224644448256 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 [email protected]. To view this discussion visit https://groups.google.com/a/chromium.org/d/msgid/blink-dev/696618d9.050a0220.22847.0386.GAE%40google.com.
