[Feature] Option to define a null TextureID

[jekyllgrim]

GZDoom version

GZDoom 4.12.2

Which game are you running with GZDoom?

None

What Operating System are you using?

None

If Other OS, please describe

No response

Relevant hardware info

No response

Is your feature request related to a problem? Please describe.

It's currently not possible to define a null TextureID. In a code block this is solved by manually calling SetNull() or SetInvalid() on a previously declared TextureID, but this doesn't cut it for functions: it's not possible to define an optional TextureID-type argument, since neither TextureID tex = 0 nor TextureID tex = null are recognized.

Describe the solution you'd like

No response

Describe alternatives you've considered

No response

Add any other context or screenshots about the feature request here.

No response

[coelckers]

Of course this does exist, use FNullTextureId().
It could be done better these days but what's there is working.

[RicardoLuis0]

the thing is, FNullTextureId isn't exported to ZScript, and that's what this is asking for (i'm gonna add it myself when i get to it, that's why i assigned myself to it)