Initial commit

singletons/Music.gd

@@ -0,0 +1,34 @@
+extends Node
+
+"""
+Music singleton that handles crossfading when a new song starts
+and applies a low pass filter when the game is paused. Nothing too wise
+"""
+
+var current_track = ""
+
+var music_bus
+
+func _ready():
+	music_bus = AudioServer.get_bus_index($A.bus)
+
+
+func play(stream):
+	if current_track == "a":
+		$B.stream = load(stream)
+		$anims.play("AtoB")
+		current_track = "b"
+	else:
+		$A.stream = load(stream)
+		$anims.play("BtoA")
+		current_track = "a"
+
+
+# Simple 'muffled music' effect on pause using a low pass filter
+func _notification(what):
+	if what == NOTIFICATION_PAUSED:
+		AudioServer.set_bus_effect_enabled(music_bus,0,true)
+		AudioServer.set_bus_volume_db(music_bus,-10)
+	elif what == NOTIFICATION_UNPAUSED:
+		AudioServer.set_bus_effect_enabled(music_bus,0,false)
+		AudioServer.set_bus_volume_db(music_bus,0)