From 7e1e17d54184c1400b4f0e888aa4deee096bbb88 Mon Sep 17 00:00:00 2001
From: PurSnake <mikesaygasamp@mail.ru>
Date: Fri, 10 Oct 2025 00:43:52 +0300
Subject: [PATCH] Changes

---
 project.hxp                     |  9 +++++++++
 source/funkin/InitState.hx      | 21 +++++++++++++++++++++
 source/funkin/save/Save.hx      |  2 +-
 source/funkin/util/Constants.hx |  7 +++++++
 4 files changed, 38 insertions(+), 1 deletion(-)

diff --git a/project.hxp b/project.hxp
index 24bdeb6b91e..c53ccb5497d 100644
--- a/project.hxp
+++ b/project.hxp
@@ -298,6 +298,13 @@ class Project extends HXProject
    */
   static final FEATURE_DISCORD_RPC:FeatureFlag = "FEATURE_DISCORD_RPC";
 
+  /**
+   * `-DFEATURE_LOST_FOCUS_VOLUME`
+   * If this flag is enabled, the game will reduce application volume, when lost focus.
+   * Allowed only on Desktop targets.
+   */
+  static final FEATURE_LOST_FOCUS_VOLUME:FeatureFlag = "FEATURE_LOST_FOCUS_VOLUME";
+
   /**
    * `-DFEATURE_FILE_DROP`
    * If this flag is enabled, the game will support dragging and dropping files onto it for various features.
@@ -862,6 +869,8 @@ class Project extends HXProject
     // We don't want testers to accidentally leak songs to their Discord friends!
     FEATURE_DISCORD_RPC.apply(this, isDesktop() && !FEATURE_DEBUG_FUNCTIONS.isEnabled(this));
 
+    FEATURE_LOST_FOCUS_VOLUME.apply(this, isDesktop());
+
     // Newgrounds features
     FEATURE_NEWGROUNDS.apply(this, !isMobile());
     FEATURE_NEWGROUNDS_DEBUG.apply(this, false);
diff --git a/source/funkin/InitState.hx b/source/funkin/InitState.hx
index b2948e5955d..9df9e606386 100644
--- a/source/funkin/InitState.hx
+++ b/source/funkin/InitState.hx
@@ -217,6 +217,10 @@ class InitState extends FlxState
       });
       #end
 
+      #if FEATURE_LOST_FOCUS_VOLUME
+      FlxG.signals.focusLost.add(onLostFocus);
+      FlxG.signals.focusGained.add(onGainFocus);
+      #end
       //
       // ANDROID SETUP
       //
@@ -292,6 +296,23 @@ class InitState extends FlxState
     #end
   }
 
+  #if FEATURE_LOST_FOCUS_VOLUME
+  @:noCompletion var _lastFocusVolume:Null<Float>;
+
+  function onLostFocus()
+  {
+    if (FlxG.sound.muted || FlxG.sound.volume == 0 || FlxG.autoPause) return;
+    _lastFocusVolume = FlxG.sound.volume;
+    FlxG.sound.volume *= Constants.LOST_FOCUS_VOLUME_MULTIPLIER;
+  }
+
+  function onGainFocus()
+  {
+    if (FlxG.sound.muted || FlxG.autoPause) return;
+    if (_lastFocusVolume != null) FlxG.sound.volume = _lastFocusVolume;
+  }
+  #end
+
   /**
    * Start the game.
    *
diff --git a/source/funkin/save/Save.hx b/source/funkin/save/Save.hx
index 8720fe73cb7..b0f22d15703 100644
--- a/source/funkin/save/Save.hx
+++ b/source/funkin/save/Save.hx
@@ -1511,4 +1511,4 @@ typedef SaveDataStageEditorOptions =
    * @default dad
    */
   var ?dadChar:String;
-}
+}
\ No newline at end of file
diff --git a/source/funkin/util/Constants.hx b/source/funkin/util/Constants.hx
index 73e229613d9..ff009608f93 100644
--- a/source/funkin/util/Constants.hx
+++ b/source/funkin/util/Constants.hx
@@ -570,6 +570,13 @@ class Constants
   public static final GHOST_TAP_DELAY:Float = 3 / 8;
   #end
 
+  #if FEATURE_LOST_FOCUS_VOLUME
+  /**
+   * How much volume should be reduced on Application Focus Lost.
+   */
+  public static final LOST_FOCUS_VOLUME_MULTIPLIER:Float = 0.5;
+  #end
+
   /**
    * Otherwise known as "The FuckCunt Variable"
    */