Add Z-Index for Autotile

[guilhermefelipecgs]

Demo: https://github.com/guilhermefelipecgs/z-index_demo

[mhilbrunner]

cc @MarianoGnu

[MarianoGnu]

hum, this is not taken in account in the PR i just oppened about TileSet Editor rewrite :/
#20585
To be honest i never thought on z index, was not a problem for me when i used it.
Code looks good, but if any of the PR is merged the other one will need rebase to fix merge conflicts (more than fixing is a new implementation...)

[guilhermefelipecgs]

I don't mind in rebase my PR if needed, my changes are simple.

[guilhermefelipecgs]

Rebased.

[akien-mga]

@guilhermefelipecgs Is it only for AutoTile? How does it interface with #16771, which added Z index support for TileSets but seems not to be properly exposed now in the new TileSet editor? CC @PJB3005

[guilhermefelipecgs]

Is it only for AutoTile?

Yes.

How does it interface with #16771, which added Z index support for TileSets but seems not to be properly exposed now in the new TileSet editor?

Should works fine.
I just add the z index of the AutoTile with the z_index created by this pr #16771. This way the two z index is considered.
https://github.com/godotengine/godot/blob/6da73b7897851ede7647c265ec53b7f4ee573af2/scene/2d/tile_map.cpp#L332

[akien-mga]

Thanks!

[guilhermefelipecgs]

I've created a very simple demo showing how to use it if someone is interested.

Demo: https://github.com/guilhermefelipecgs/z-index_demo

[stormi]

Thanks for the z-index, most useful to avoid having separate tilemaps for foreground and background.

I think something is missing though: I've tried to use it with an Atlas (the new tileset editor allows to create "Atlases" that are groups of tiles), and it seems that the z-index is ignored for those.

[guilhermefelipecgs]

@stormi I thought it was working, probably I missed this, I'll take a look at it.

[stormi]

Thanks! It's also possible that I used it the wrong way :)

[guilhermefelipecgs]

Fixed, I forgot to add some lines.