gd: added menu template

addons/maaacks_game_template/extras/scripts/level_loader.gd

@@ -0,0 +1,52 @@
+@tool
+class_name LevelLoader
+extends Node
+## Loads scenes into a container.
+
+signal level_load_started
+signal level_loaded
+signal level_ready
+
+## Container where the level instance will be added.
+@export var level_container : Node
+## Loads a level on start.
+@export var auto_load : bool = false
+@export var current_level_path : String
+@export_group("Debugging")
+@export var force_level : String
+@export var current_level : Node
+
+var is_loading : bool = false
+
+func get_current_level_path() -> String:
+	return current_level_path if force_level.is_empty() else force_level
+
+func _attach_level(level_resource : Resource):
+	assert(level_container != null, "level_container is null")
+	var instance = level_resource.instantiate()
+	level_container.call_deferred("add_child", instance)
+	return instance
+
+func load_level(level_path : String = get_current_level_path()):
+	if is_loading : return
+	if is_instance_valid(current_level):
+		current_level.queue_free()
+		await current_level.tree_exited
+		current_level = null
+	is_loading = true
+	current_level_path = level_path
+	SceneLoader.load_scene(level_path, true)
+	level_load_started.emit()
+	await SceneLoader.scene_loaded
+	is_loading = false
+	current_level = _attach_level(SceneLoader.get_resource())
+	level_loaded.emit()
+	await current_level.ready
+	level_ready.emit()
+
+func reload_level():
+	load_level()
+
+func _ready():
+	if auto_load:
+		load_level()