Implement record feature for AnimationTree.

[Daylily-Zeleen]

Impelent record featrure to instead of #77347.

AnimRecord.2.mp4

Bugsquad edited: Closes godotengine/godot-proposals#6807

Demo project:

animation_rollback_test.zip

Simple benchmark between List<Record>, LocalVector<Record> and CircularDeque<Record> for this use case:

[jcostello]

How does it work?

[TokageItLab]

I think these three variables are not necessary. Instead, I guess you may need some way to avoid doing double processing after the call to load_record().

[Daylily-Zeleen]

state.last_pass will be overrided in _process_graph, it can't be removed.

It seem state.last_pass and process_pass only be used to get activity in editor plugin,
state.valid will be overrided in _process_graph, too, and it is not be expoed to GDScript, It seem only work with state.state_invalid_reasons in editor.

In conclusion, I remove state.last_pass, and handel process_pass, state.valid and state.state_invalid_reasons only in tool build.

I guess you may need some way to avoid doing double processing after the call to load_record().

I am not sure about what do you mean of avoiding double processing.
load_record() just retrieve the state, it not do any processing of animation, it means that skeleton pose or any other animation datas is not be saved as record.
May be we should add signals to notify users that there have a new record be saved (for auto recording).

[TokageItLab]

I wanted to say that instead of recording these, it is necessary to set it up again after retrieving the parameter list with load_record().

[Daylily-Zeleen]

Sorry, I still not clearify what do you mean.
I have changed the retrieving order of Record's members in load_record(). Please review it.