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When will Rust be available for the GPU, and will this code work then?

Rust is already available for GPU, kind of: https://github.com/EmbarkStudios/rust-gpu

I don't think it's production ready though and I have no idea if this library should work on this.

How does this differ from outputting wgpu from rust?

I have no idea, I just saw this pop up on reddit again yesterday in a thread[1], I had seen it before and forgotten its existence.

wgpu uses WGSL as its shader language, not rust..?