The Explainer link is a 404 or has restricted access. We need the
explainer to be public.
/Daniel
On 2025-08-25 10:56, Yoav Weiss (@Shopify) wrote:
Can you request reviews for security/privacy/etc in chromestatus?
On Fri, Aug 22, 2025 at 10:16 PM Chromestatus
<[email protected]> wrote:
Contact emails
[email protected]
Explainer
https://dawn.googlesource.com/dawn/+/refs/heads/main/docs/tint/extensions/chromium_experimental_primitive_id.md
Specification
https://gpuweb.github.io/gpuweb/#dom-gpufeaturename-primitive-index
Summary
This feature adds a new optional capability to WebGPU that exposes
a new WGSL shader builtin, 'primitive_index'. This builtin
provides a per-primitive index to fragment shaders on supported
hardware, similar to the existing vertex_index and instance_index
builtins. The primitive index is useful for advanced graphical
techniques, such as virtualized geometry.
Blink component
Blink>WebGPU
<https://issues.chromium.org/issues?q=customfield1222907:%22Blink%3EWebGPU%22>
Search tags
webgpu <http:///features#tags:webgpu>, primitive
<http:///features#tags:primitive>
TAG review
None
TAG review status
Pending
Risks
Interoperability and Compatibility
Little to none. It's a fairly minor feature that all implementors
have voiced support for. The feature is optional and support for
it must be explicitly queried through the standard WebGPU
supported features mechanism. Some hardware doesn't expose it yet,
so developers need to structure their apps to have a fallback path
anyway.
/Gecko/: No signal
/WebKit/: No signal
/Web developers/: No signals
/Other signals/:
Ergonomics
None.
Activation
None.
Security
None.
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
WGSL shader feature. Shaders generally lack debugging support in
browsers.
Will this feature be supported on all six Blink platforms
(Windows, Mac, Linux, ChromeOS, Android, and Android WebView)?
Yes
Feature is widely supported and has equivalents in all Native APIs
that WebGPU is implemented on top of. Some older hardware lacks
ability to report the value, which is why it's an optional feature.
Is this feature fully tested by web-platform-tests
<https://chromium.googlesource.com/chromium/src/+/main/docs/testing/web_platform_tests.md>?
No
WebGPU CTS tests are a WIP: https://github.com/gpuweb/cts/pull/4435
Flag name on about://flags
enable-unsafe-webgpu
Finch feature name
None
Non-finch justification
None
Rollout plan
Will ship enabled for all users
Requires code in //chrome?
False
Tracking bug
https://issues.chromium.org/issues/342172182
Estimated milestones
No milestones specified
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/6467722716250112?gate=4665168428662784
This intent message was generated by Chrome Platform Status
<https://chromestatus.com>.
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