Un shader de transition entre les scènes

ça fait plus propre braw

scenes/game.gd

@@ -3,7 +3,10 @@ class_name GameControler
 
 func _unhandled_input(event: InputEvent) -> void:
 	if event.is_action_pressed("menu"):
-		open_menu()
+		if prev_scene == menu:
+			start_game()
+		else:
+			open_menu()
 
 # list of scenes
 var outside:Node2D = null
@@ -11,41 +14,46 @@ var dest_outside = preload("res://scenes/outside.tscn")
 var bakery:Node2D = null
 var dest_bakery = preload("res://scenes/bakery_interior.tscn")
 var menu = null
+var prev_scene = null
 
 func _ready() -> void:
 	GameState._game = self
+	menu = get_child(0)
+	prev_scene = menu
 
 func start_game():
-	menu = get_child(0)
 	switch_to(GameState.current_scene)
-	
+				
 func switch_to(to: String):
 	call_deferred("switch_scene", to)
 
+var next_scene = null
+var toMenu = false;
+var switching_to
+
 func switch_scene(to: String):
-	var prev = get_child(0)
-	GameState.current_scene = to
-	var scene
+	switching_to= to
+	print("switching to", switching_to)
+	toMenu = to == "menu"
 	match to:
 		"outside":
 			if outside == null:
 				outside = dest_outside.instantiate()
-			scene = outside
+			next_scene = outside
 		"bakery":
 			if bakery == null:
 				bakery = dest_bakery.instantiate()
-			scene = bakery
-	scene.unload()
-	call_deferred("add_child", scene)
-	call_deferred("remove_child", prev)
-	call_deferred("init_scence", scene)
-	
+			next_scene = bakery
+		"menu":
+			next_scene = menu
+	$TransitionShader.fade_out()
+
 func init_scence(scene):
 	scene.load_from_game_state()
+	$TransitionShader.fade_in()
 
 func open_menu():
-	remove_child(get_child(0))
-	add_child(menu)
+	switch_scene("menu")
 	
 func load_game():
 	var save_file = FileAccess.open("user://savegame.save", FileAccess.READ)
@@ -62,3 +70,19 @@ func save_game():
 	save_file.store_line(JSON.stringify(GameState.save(), "  ", true, true))
 	print(OS.get_data_dir())
 	save_file.close()
+
+func _on_transition_shader_fade_in_done() -> void:
+	if !toMenu:
+		GameState.current_scene = switching_to
+
+func _on_transition_shader_fade_out_done() -> void:
+	print("fade out done")
+	if !toMenu:
+		next_scene.unload()
+	call_deferred("add_child", next_scene)
+	call_deferred("remove_child", prev_scene)
+	if !toMenu:
+		call_deferred("init_scence", next_scene)
+	else:
+		$TransitionShader.fade_in()
+	prev_scene = next_scene