Inactive volume

source/funkin/backend/system/Main.hx

@@ -51,6 +51,8 @@ class Main extends Sprite
 
 	public static var time:Int = 0;
 
+	public static var isFocused:Bool = true;
+
 	// You can pretty much ignore everything from here on - your code should go in your states.
 
 	#if ALLOW_MULTITHREADING
@@ -101,6 +103,8 @@ class Main extends Sprite
 		return time = Lib.getTimer();
 	}
 
+	private static var lastVolume:Float = 0;
+
 	public static function loadGameSettings() {
 		WindowUtils.init();
 		SaveWarning.init();
@@ -155,6 +159,21 @@ class Main extends Sprite
 		FlxG.signals.preStateSwitch.add(onStateSwitch);
 		FlxG.signals.postStateSwitch.add(onStateSwitchPost);
 
+		FlxG.signals.focusLost.add(function()
+		{
+			isFocused = false;
+			lastVolume = FlxG.sound.volume;
+			Options.volume = FlxG.sound.volume;
+			if(Options.inactiveVolumeEnabled && !Options.autoPause)
+				FlxG.sound.volume = Options.inactiveVolume / 100;
+		});
+
+		FlxG.signals.focusGained.add(function()
+		{
+			isFocused = true;
+			FlxG.sound.volume = lastVolume;
+		});
+
 		FlxG.mouse.useSystemCursor = true;
 
 		ModsFolder.init();

source/funkin/options/Options.hx

@@ -25,6 +25,8 @@ class Options
 	public static var autoPause:Bool = true;
 	public static var antialiasing:Bool = true;
 	public static var volume:Float = 1;
+	public static var inactiveVolume:Float = 2;
+	public static var inactiveVolumeEnabled:Bool = true;
 	public static var week6PixelPerfect:Bool = true;
 	public static var gameplayShaders:Bool = true;
 	public static var colorHealthBar:Bool = true;
@@ -149,7 +151,8 @@ class Options
 	}
 
 	public static function save() {
-		volume = FlxG.sound.volume;
+		if (Main.isFocused)
+			volume = FlxG.sound.volume;
 		__flush();
 	}
 }

source/funkin/options/categories/AppearanceOptions.hx

@@ -47,6 +47,18 @@ class AppearanceOptions extends OptionsScreen {
 			"Auto Pause",
 			"If checked, switching windows will pause the game.",
 			"autoPause"));
+		add(new Checkbox(
+			"Use inactive volume",
+			"If checked, the games volume will turn down when the window is inactive.",
+			"inactiveVolumeEnabled"));
+		add(new NumOption(
+			"Inactive Volume",
+			"Volume percentage the window will change too when the window is inactive.",
+			0,
+			100,
+			2,
+			"inactiveVolume",
+			null));
 	}
 
 	private function __changeFPS(change:Float) {