Make naga_oil stringify! compatible.

[mintlu8]

naga_oil not being stringify! compatible severely hurts the viability of macro generated shaders.

To make naga_oil compatible we need

• Treat # import as #import.

• Ignore line breaks and use expression based parsing

[stefnotch]

What exactly does being stringify! compatible mean? Asking, because I am working on eventual naga-oil/WGSL importing improvements.

[mintlu8]

What exactly does being stringify! compatible mean? Asking, because I am working on eventual naga-oil/WGSL importing improvements.

Mostly whitespace agnostic like rust and wgsl itself.
I don't think this is a huge issue but naga_oil being whitespace agnostic could probably benefit the spec in the long run.

[stefnotch]

Sounds like a reasonable request. I guess we'll need a different #ifdef syntax as well, because the typical one relies on it being on a separate line.