Simple FSM

simple_state.gd

# https://www.reddit.com/r/godot/comments/rfzwom/sexystupid_state_machine_in_8_lines/
class_name StateMachine extends Node

signal state_changed
var state:int = 0 setget _set_state

func _init(inital_state:int = 0) -> void:
	state = inital_state
	pass

func _set_state(new_state:int) -> void:
	var old_state: int = state
	if new_state  == old_state: return
	state = new_state
	emit_signal("state_changed",old_state,new_state)
	pass