Support Sliced 3D for ASTC

[mehmetoguzderin]

Connections

Fixes #7576

Description

This PR aims to enable "texture-compression-astc-sliced-3d" for backends that support ASTC (such as excluding D3D12).

If any aspects could be improved to make it more suitable for the project, please let me know, and I will adjust it. Thank you very much in advance!

Testing

Mainly cargo xtask test.

Squash or Rebase?

Squash

Checklist

• Run cargo fmt.
• Run taplo format.
• Run cargo clippy --tests. If applicable, add:
  • --target wasm32-unknown-unknown
• Run cargo xtask test to run tests.
• If this contains user-facing changes, add a CHANGELOG.md entry.

[mehmetoguzderin]

Adjusted after running cargo clippy --tests --target wasm32-unknown-unknown locally. Thank you!

[Wumpf]

thanks! Looks mostly good to me, some changes proposed in comments.

Would be great to have a test for this that generates astc textures, but iirc we don't have that for other compressed formats either :/

[mehmetoguzderin]

@Wumpf Thank you very much for the review. Besides accepting the suggestion, I made a commit to address the other ones. For testing in general for compression maybe a tracking issue can be created however webgpu-samples already include an astc-compressed example data (and CTS covers ASTC Sliced 3D), or I can try to help in a consecutive PR to have it generate directly inside repo. Appreciated. Hope the commits help.

[Wumpf]

Thank you so much! looking great
We unfortunately don't run webgpu conformance tests in-repo right now, but Mozilla is running it on their side so true, that should give us some coverage already. Would be still nice to have a dedicated unit test on our side, but as mentioned that's true for all other compression formats as well. Created a ticket about that here

[mehmetoguzderin]

@Wumpf thank you, I appreciate the kind review & merge!