🖥 UI System about bevy_retrograde HOT 7 CLOSED

Almost finished! Got it hooked up to the ECS. Needs a change to RAUI that still needs review, but I think we'll be able to make it work somehow.

We can now get access to the Bevy World inside of the widget components allowing us to send events, mutate entities, read resources, etc. Already the Radishmark examle is using it to display the FPS counter and the new UI example can send events to move the background image when you click the button!

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It will take more investigation, but I think building on top of Iced might be a good idea. It's so modularized that we could potentially just take it's very core features and the Elm-like runtime and then totally design our own widgets and layout stuff to be simple however we need it for Bevy Retro.

We could try out Bevy's UI, too, but I have a feeling using Bevy's UI with our own renderer will not work quite right, and the I think Bevy UI is going to be changing a lot so I'm not sure that I want to bet on it just yet. Not that Iced isn't changing either, I just feel that it's going to be more fleshed out.

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And I'm re-thinking that again, actually. We've already got the ECS for state storage so the ELM architecture might not make a ton of sense here. Anyway, going to be doing some searching around and running experiments.

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Just finished implementing render hooks which give us a way to modularly extend the renderer. This will allow us to add the UI renderer as a separate render hook.

For UI we are looking into using the RAUI crate which appears to have all the features we need.

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Great progress has been made supporting UI with RAUI: RAUI-labs/raui#17!

There's currently an example that needs work, but is functional: https://github.com/katharostech/bevy_retro/blob/8a44707cb1324951127b62c612d061862dd745c0/examples/ui.rs#L1

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Got the rendering finished up, just have to get it hooked up so you can interact with the ECS world somehow. We've gotten a good rendering example going now:

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Well, I'm going to consider UI "finished"! There might be more work to do, but I'll create more issues for those. Our PR to RAUI has been accepted and should be merged soon and UI is usable right now in Bevy Retro as it points to our RAUI fork.

🎉 🎉 🎉

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