Add Entrypoint.keep_velocity and optimize level/entrypoint loading code

core/globals/levels.gd

@@ -5,30 +5,37 @@ const mainmenu_player_pos: Vector2 = Vector2(0, 128 + 32)
 class Entrypoint extends Object:
 	var scene_name: String
 	var player_position: Vector2
+	var keep_velocity: bool
 	var initial_velocity: Vector2
 	func _init(
 		scene_name_: String,
 		player_position_: Vector2,
+		# keep player velocity
+		# if player velocity is zero, use initial_velocity
+		keep_velocity_: bool = true,
+		# initial player velocity
 		initial_velocity_: Vector2 = Vector2.ZERO
 	) -> void:
 		self.scene_name = scene_name_
 		self.player_position = player_position_
+		self.keep_velocity = keep_velocity_
 		self.initial_velocity = initial_velocity_
 
 const SCENES = {
 	"intro": "uid://c6w7lrydi43ts",
 	"test": "uid://dqf665b540tfg",
 }
-
-var ENTRYPOINTS = {
-	"intro_start": Entrypoint.new("intro", Vector2.ZERO),
-	"test": Entrypoint.new("test", Vector2.ZERO),
-}
-
 var MENU_SCENE: PackedScene = preload("res://menu/menu.tscn")
 
+var ENTRYPOINTS = {
+	"intro_start": Entrypoint.new("intro", Vector2(0, 0)),
+	"test": Entrypoint.new("test", Vector2(0, 200), false, Vector2(0, -500)),
+}
+
 # load that stuff
 
+var current_scene_name: String = ""
+
 func _pre_load_checks() -> bool:
 	if NodeRegistry.level_root_container == null:
 		push_error("Can't load level, level_root is not registered yet.")
@@ -38,7 +45,10 @@ func _pre_load_checks() -> bool:
 		return false
 	return true
 
-func load_scene(scn_name: String) -> bool:  # returns true on success
+func load_scene(scn_name: String, force_reload: bool = false) -> bool:
+	# returns true on success
+	if current_scene_name == scn_name and not force_reload:
+		return true # nothing to do :)
 	if not _pre_load_checks():
 		return false
 	if not scn_name in SCENES:
@@ -61,9 +71,11 @@ func load_entrypoint(ep_name: String) -> bool: # returns true on success
 	if not _pre_load_checks():
 		return false
 	var e: Entrypoint = ENTRYPOINTS[ep_name]
+	var loaded = false
 	if load_scene(e.scene_name):
 		NodeRegistry.player.position = e.player_position
-		NodeRegistry.player.velocity = e.initial_velocity
+		if not e.keep_velocity or NodeRegistry.player.velocity == Vector2.ZERO:
+			NodeRegistry.player.velocity = e.initial_velocity
 		Gamestate.last_entrypoint = ep_name
 		Gamestate.save_slot() # save game
 		return true