Update gdshader syntax

[DaelonSuzuka]

Pull additional gdshader syntax improvements from @AlfishSoftware's work

The shader syntax looks good to me, but I'm currently trying to solicit feedback on the gdshader example file.

[Calinou]

but I'm currently trying to solicit feedback on the gdshader example file.

I think it's pretty complete now. That reminds me, I should figure out adding .gdshader syntax highlighting on GitHub (and updating the GDScript syntax highlighter used on GitHub too).

[DaelonSuzuka]

That reminds me, I should figure out adding .gdshader syntax highlighting on GitHub (and updating the GDScript syntax highlighter used on GitHub too).

Wait, we can do that?

[Calinou]

Wait, we can do that?

Yes, GitHub uses a public repository as a base for its syntax highlighting: https://github.com/github/linguist/blob/master/CONTRIBUTING.md

[AlfishSoftware]

I'm currently trying to solicit feedback on the gdshader example file

I don't know if the purpose of that file is to be more like an "exhaustive" syntax test, but ...
in case it is, taking a look I didn't find tests involving:

• arrays (e.g. array constructors, array fields in structs (A[2] b; A b[2];), etc), both declaration and initialization
• precision modifiers (including in array initialization and struct fields)
• in, out modifiers
• const definitions
• swizzling (e.g. .argb, .stpq, .wzy, etc); methods (I think .length() is the only one?)
• some constructs, like switch case/default, break/continue, do while, discard
• many syntax variations for numeric literals (uint, float)
• all possible operators (e.g. && -=, etc)

I have already tested these things, so maybe my files are pointless, but, if you want, you can check one of my test files with things from the docs, to catch some you might be missing. Like I said before, I lost my other test file, which started here. There's also one with some variations of float literal syntax in this issue.

If the purpose of the file is something else, just ignore what I said.

[DaelonSuzuka]

I don't know if the purpose of that file is to be more like an "exhaustive" syntax test, but ...
in case it is, taking a look I didn't find tests involving:

Yeah, that's exactly what it is.

All fantastic suggestions, thanks for the write-up. I'll have to study your test files a bit and come back to updating mine.

@Calinou I'll expand the gdshader test file later, so this PR is ready as far as I'm concerned.

[Calinou]

Thanks a ton!