Texture Component Swizzling

Is there a way currently (or planned in the future) to perform texture component swizzling?

I'm referring to something like:
https://www.khronos.org/registry/vulkan/specs/1.2-extensions/man/html/VkComponentMapping.html

This will be useful for textures with only alpha channels (and similar use cases).
Seems like otherwise we have to use TextureFormat::R* variants and swizzle them to alpha channel in every shader, which does not seem ideal.

[kvark]

This isn't in WebGPU today because of earlier Metal versions. It's a good candidate for an optional feature.
See #754 for an example of how to roll such a feature out. A PR would be appreciated, and we are happy to mentor (ideally, via our "#wgpu:matrix.org" chat).

Edit: also added to https://github.com/gfx-rs/wgpu/wiki/Extensions

[cwfitzgerald]

We have no current plans to support this.