Merge branch 'internal-merge' into stage-rewrite

Author: Jamextreme140

source/funkin/backend/system/Flags.hx

@@ -117,6 +117,7 @@ class Flags {
 	public static var ICONS_AUTOPOSITION:Bool = true;
 
 	@:lazy public static var DEFAULT_SOUND_TIME_SCALED_PITCH:Null<Bool> = null;
+	@:lazy public static var USE_SOUND_VOLUME_CURVE:Null<Bool> = null;
 	@:lazy public static var USE_FLXTRAIL_FRAMES:Null<Bool> = null;
 
 	public static var SUPPORTED_CHART_RUNTIME_FORMATS:Array<String> = ["Legacy", "Psych Engine"];
@@ -341,6 +342,7 @@ class Flags {
 			}
 		}
 		if (DEFAULT_SOUND_TIME_SCALED_PITCH == null) DEFAULT_SOUND_TIME_SCALED_PITCH = MOD_API_VERSION >= 2;
+		if (USE_SOUND_VOLUME_CURVE == null) USE_SOUND_VOLUME_CURVE = MOD_API_VERSION >= 2;
 		if (USE_FLXTRAIL_FRAMES == null) USE_FLXTRAIL_FRAMES = MOD_API_VERSION < 2;
 
 		flixel.sound.FlxSound.defaultTimeScaledPitch = cast DEFAULT_SOUND_TIME_SCALED_PITCH;

source/funkin/backend/system/Main.hx

@@ -138,6 +138,8 @@ class Main extends Sprite
 		game.focusLostFramerate = 30;
 		FlxG.fixedTimestep = false;
 		FlxG.scaleMode = scaleMode = new FunkinRatioScaleMode();
+		FlxG.sound.applySoundCurve = applySoundCurve;
+		FlxG.sound.reverseSoundCurve = reverseSoundCurve;
 
 		Conductor.init();
 		EventManager.init();
@@ -162,6 +164,14 @@ class Main extends Sprite
 		initTransition();
 	}
 
+	public static function applySoundCurve(volume:Float) {
+		return Flags.USE_SOUND_VOLUME_CURVE ? Math.pow(volume, 1.75) : volume;
+	}
+
+	public static function reverseSoundCurve(curvedVolume:Float) {
+		return Flags.USE_SOUND_VOLUME_CURVE ? Math.pow(curvedVolume, 0.5714285714285714) : curvedVolume;
+	}
+
 	static var persistShaderKeys:Map<String, Bool>;
 
 	public static function refreshAssets() @:privateAccess {