Spawn items support

[64kramsystem]

Add spawn items support:

• metadata types, and metadata loading
• (level) loading and instantiation

The level loading (main.rs#load_items) follows the pattern of loading items metadata, then separately instantiating them.

I've removed the Pickable component, since until now, it serves no purpose. It may be reinstantiated.

I've also done some refactoring in the assets.rs module, consistently using the convenience loading API that was used only a few times.

This PR addresses the first entry in #83.

[64kramsystem]

@zicklag Do you know why the AssetLoader is not invoked at all in this branch (here)?

I've put everything in place, but assets under /items/ are ignored. I've tried to figure out what triggers a load, but looking at fighters for example, doesn't seems to lead to any explicit loading code (so I take there's an implicit load somewhere).

[zicklag]

You need to load them as a part of the level load with another block like this one:

https://github.com/64kramsystem/punchy-dev/blob/ae35d77424e3885e8ddd045f7691335224738ecf/src/assets.rs#L169-L177

[64kramsystem]

Ah! I need to do all the manual load 😳 I'll try this, thanks 😄

[zicklag]

Thanks! I'm actually already doing that here.

No, you have to do it in the Level asset loader. The level asset loader is responsible for telling the asset server that it depends on the item assets ( which is why your item asset loader wasn't getting run ), and for setting the item handles to their actual handles in the level metadata, otherwise they will default to null handles.

Edit:

Ah! I need to do all the manual load flushed I'll try this, thanks smile

Yep. :)

[64kramsystem]

@erlend-sh CC

[zicklag]

Looks great!

I like your attention to code style and quality and improvement. 👍