Make use of newly added subgroups

[alienself]

Hi,

Quick question, since Chrome 125, webgpu now has subgroups, would it be possible to add native support for them using the currently available WGSL API?

See: https://developer.chrome.com/blog/new-in-webgpu-128#experimenting_with_subgroups

Thanks!

[KeKsBoTer]

I tried it in the past but chrome returned 0 for min and max subgroup size.
I have to check for newer versions

[alienself]

It seems like they made some changes since Chrome 128 and are experimenting with the proposal so it's not in the officel WGSL spec yet, meaning it's behind the webgpu flag: chrome://flags/#enable-unsafe-webgpu (or by signing up for the origin trial) for the next 4 versions of chrome. All the subgroup functions mentioned in the proposal should be available.

Let me know if you end up digging into it again, it would be amazing to finally have a super fast and optimized sorting solution with webgpu!

[KeKsBoTer]

Unfortunately, I get some weird behavior when querying the min and max from the device.
Tested on Ubuntu 24.04 with Chrome 128.