add game menu

core/game_menu/audio_option.gd

@@ -0,0 +1,67 @@
+@tool
+extends VBoxContainer
+
+class_name AudioOption
+
+const MIN_VOLUME: float = 0.0
+const MAX_VOLUME: float = 1.0
+
+@export var image: Texture:
+	set(value):
+		image = value
+		if is_inside_tree() and has_node("%Texture"):
+			$%Texture.texture = image
+
+@export var bus_name: StringName = &"Master"
+@export_range(0.0, 1.0, 0.01) var default_volume: float = 1.0
+
+@onready var slider: HSlider = $HSlider
+
+func _ready() -> void:
+	if image != null and has_node("%Texture"):
+		$%Texture.texture = image
+		
+	if Engine.is_editor_hint():
+		return
+
+	slider.min_value = MIN_VOLUME
+	slider.max_value = MAX_VOLUME
+	slider.step = 0.01
+	slider.value_changed.connect(_on_slider_value_changed)
+	refresh()
+	
+func refresh() -> void:
+	if not has_bus():
+		slider.set_value_no_signal(default_volume)
+		slider.editable = false
+		return
+
+	slider.editable = true
+	var saved_volume := AudioManager.get_audio_bus_volume(bus_name, default_volume)
+	slider.set_value_no_signal(saved_volume)
+	apply_current_value()
+
+func reset_to_default() -> void:
+	slider.value = default_volume
+
+func apply_current_value() -> void:
+	_set_bus_volume(slider.value)
+
+func has_bus() -> bool:
+	return get_bus_index() != -1
+
+func get_bus_index() -> int:
+	return AudioServer.get_bus_index(bus_name)
+
+func _set_bus_volume(linear_value: float) -> void:
+	if Engine.is_editor_hint():
+		return
+	
+	if not has_bus():
+		return
+
+	var clamped_value := clampf(linear_value, MIN_VOLUME, MAX_VOLUME)
+	AudioManager.set_audio_bus_volume(bus_name, clamped_value)
+
+func _on_slider_value_changed(value: float) -> void:
+	_set_bus_volume(value)