Disable AudioStreamPlayer2D/3D area bus override by default to improve performance

This reduces the number of physics checks performed by each
AudioStreamPlayer2D/3D node in the scene.

This is accomplished by setting the default area mask to 0
and exiting early when the area mask is to 0 to improve performance.
Note that in existing projects, the value will only be set to 0
if it was previously set to the default value (1).

The feature can be re-enabled by setting the area mask to 1
(or any other value) on each AudioStreamPlayer2D/3D node.

doc/classes/AudioStreamPlayer2D.xml

@@ -53,7 +53,7 @@
 		</method>
 	</methods>
 	<members>
-		<member name="area_mask" type="int" setter="set_area_mask" getter="get_area_mask" default="1">
+		<member name="area_mask" type="int" setter="set_area_mask" getter="get_area_mask" default="0">
 			Determines which [Area2D] layers affect the sound for reverb and audio bus effects. Areas can be used to redirect [AudioStream]s so that they play in a certain audio bus. An example of how you might use this is making a "water" area so that sounds played in the water are redirected through an audio bus to make them sound like they are being played underwater.
 		</member>
 		<member name="attenuation" type="float" setter="set_attenuation" getter="get_attenuation" default="1.0">

doc/classes/AudioStreamPlayer3D.xml

@@ -53,7 +53,7 @@
 		</method>
 	</methods>
 	<members>
-		<member name="area_mask" type="int" setter="set_area_mask" getter="get_area_mask" default="1">
+		<member name="area_mask" type="int" setter="set_area_mask" getter="get_area_mask" default="0">
 			Determines which [Area3D] layers affect the sound for reverb and audio bus effects. Areas can be used to redirect [AudioStream]s so that they play in a certain audio bus. An example of how you might use this is making a "water" area so that sounds played in the water are redirected through an audio bus to make them sound like they are being played underwater.
 		</member>
 		<member name="attenuation_filter_cutoff_hz" type="float" setter="set_attenuation_filter_cutoff_hz" getter="get_attenuation_filter_cutoff_hz" default="5000.0">

scene/2d/audio_stream_player_2d.cpp

@@ -82,6 +82,10 @@ void AudioStreamPlayer2D::_notification(int p_what) {
 // Interacts with PhysicsServer2D, so can only be called during _physics_process.
 StringName AudioStreamPlayer2D::_get_actual_bus() {
 #ifndef PHYSICS_2D_DISABLED
+	if (area_mask == 0) {
+		return internal->bus;
+	}
+
 	Vector2 global_pos = get_global_position();
 
 	//check if any area is diverting sound into a bus

scene/2d/audio_stream_player_2d.h

@@ -68,7 +68,7 @@ private:
 
 	static void _listener_changed_cb(void *self) { reinterpret_cast<AudioStreamPlayer2D *>(self)->force_update_panning = true; }
 
-	uint32_t area_mask = 1;
+	uint32_t area_mask = 0;
 
 	float max_distance = 2000.0;
 	float attenuation = 1.0;

scene/3d/audio_stream_player_3d.cpp

@@ -306,6 +306,10 @@ void AudioStreamPlayer3D::_notification(int p_what) {
 #ifndef PHYSICS_3D_DISABLED
 // Interacts with PhysicsServer3D, so can only be called during _physics_process
 Area3D *AudioStreamPlayer3D::_get_overriding_area() {
+	if (area_mask == 0) {
+		return nullptr;
+	}
+
 	//check if any area is diverting sound into a bus
 	Ref<World3D> world_3d = get_world_3d();
 	ERR_FAIL_COND_V(world_3d.is_null(), nullptr);

scene/3d/audio_stream_player_3d.h

@@ -100,7 +100,7 @@ private:
 #endif // PHYSICS_3D_DISABLED
 	Vector<AudioFrame> _update_panning();
 
-	uint32_t area_mask = 1;
+	uint32_t area_mask = 0;
 
 	AudioServer::PlaybackType playback_type = AudioServer::PlaybackType::PLAYBACK_TYPE_DEFAULT;