Port demos with remade art assets to Godot 4

[Calinou]

This re-ports the following demos to Godot 4 following their latest 3.x versions:

• 2D Navigation with AStarGrid2D
• 2D JRPG Demo
• 2D Isometric Game
• 2D Platformer

Some tweaks have also been made in the process, such as split screen players having different colors in the 2D Platformer demo.

I'm having trouble porting the 2D JRPG demo due to AnimationTree stuff I'm not proficient with. Could someone lend a hand?
Edit: Fixed by Calinou#3. Thanks @Nonparoxysmic!

• This closes 2d/role_playing_game broken on godot v4.0 #879
  and closes name=GPUParticles2D type=CPUParticles2D #785.

Preview

[jtnicholl]

The existing 4.0 version of the 2D platformer included cleaned up scripts, reorganized files, and improved controls. I'd prefer not to have that all be undone.

[Calinou]

The existing 4.0 version of the 2D platformer included cleaned up scripts, reorganized files, and improved controls. I'd prefer not to have that all be undone.

I don't see an easy way to merge both. Redoing all the tiles and animations from scratch by basing myself on the 4.0 demo would be too much work.

I can try to replicate the new file structure and port some script changes from the 4.0 demo still.

Edit: Done.

[zf-moth]

I'm having trouble porting the 2D JRPG demo due to AnimationTree stuff I'm not proficient with. Could someone lend a hand?

@Calinou Do you still need help with that? Or is it finished?

[Calinou]

@Calinou Do you still need help with that? Or is it finished?

I still need help with that, and won't have time to work on this in the near future. Please look into it if you can – it'll be very appreciated 🙂

Edit: See Calinou#3.

[Calinou]

This should be good to merge thanks to @Nonparoxysmic's work 🙂

[aaronfranke]

Blind approval to unblock.

[Geometror]

Did a quick test with all four demos. Almost all of them work fine, there's just one thing: The dialog box in the RPG demo looks a bit weird/broken.

[Calinou]

I've retested all demos on 4.2.1 and saved them again, with no warnings occurring when you run the projects.

I've fixed the JRPG demo UI theme (and have also increased font sizes to match the rest of the UI):

However, there's an issue with the navigation demo I get since 4.1. Nothing happens when I click on empty space on the TileMap, and I get this error:

ERROR: Can't get id path. Point (0, 0) out of bounds [P: (1, 1), S: (16, 8)].
   at: get_point_path (core/math/a_star_grid_2d.cpp:492)

Edit: I fixed the navigation AStar issue. It was caused by get_used_rect() not working anymore on TileMap, so I manually specified the size which is also more predictable in this demo.

[smix8]

Tested the 4 demos:

• 2D Navigation with AStarGrid2D - works fine
• 2D JRPG Demo (todo) - works with 4.2 but does not work with Godot master due to TileMapLayer changes.
• 2D Isometric Game - works fine but has some weird "soft" shadow changes in the middle around where the carpet is placed.
• 2D Platformer - works fine

[smix8]

Demos work for 4.2.1 if that is the current target.