Added Glitch Room Source code to Gitty

games/pacman/pacman_audio.gd

@@ -0,0 +1,96 @@
+extends Node
+## Separate effects from ambience so pellet sounds never restart the siren.
+## Tune this to the end of the fourth wah in death_0.wav.
+const DEATH_INTRO_SECONDS := 1.35
+var death_cutoff: Timer
+var effects: Array[AudioStreamPlayer] = []
+var ambience: AudioStreamPlayer
+var streams := {}
+var background := ""
+var effect_cursor := 0
+var death_tail := false
+var intro_pending := false
+
+func _ready() -> void:
+	death_cutoff = Timer.new()
+	death_cutoff.one_shot = true
+	add_child(death_cutoff)
+	death_cutoff.timeout.connect(_death_finished)
+	for i in range(4):
+		var voice := AudioStreamPlayer.new()
+		voice.volume_db = -10.0
+		add_child(voice)
+		effects.append(voice)
+	ambience = AudioStreamPlayer.new()
+	ambience.volume_db = -15.0
+	add_child(ambience)
+	ambience.finished.connect(_ambient_finished)
+	effects[3].finished.connect(_death_finished)
+
+func stream(name: String) -> AudioStream:
+	if not streams.has(name):
+		var path := "res://games/pacman/audio/%s.wav" % name
+		if not ResourceLoader.exists(path): return null
+		streams[name] = load(path)
+	return streams[name]
+
+func play_effect(name: String) -> void:
+	if name == "death":
+		stop_all()
+		death_tail = true
+		effects[3].stream = stream("death_0")
+		effects[3].play()
+		death_cutoff.start(DEATH_INTRO_SECONDS)
+		return
+	var voice: AudioStreamPlayer = effects[0] if name.begins_with("eat_dot") else effects[1 + effect_cursor % 2]
+	if not name.begins_with("eat_dot"): effect_cursor += 1
+	voice.stream = stream(name)
+	if voice.stream != null: voice.play()
+
+func _death_finished() -> void:
+	if not death_tail: return
+	death_tail = false
+	death_cutoff.stop()
+	effects[3].stop()
+	effects[3].stream = stream("death_1")
+	effects[3].play()
+
+func set_background(name: String) -> void:
+	if name == background: return
+	background = name
+	ambience.stop()
+	intro_pending = false
+	if name.is_empty(): return
+	var intro := stream(name + "_firstloop")
+	# Join PCM samples before playback: no finished-signal gap at the intro seam.
+	ambience.stream = _loop_stream(name, intro)
+	if ambience.stream != null: ambience.play()
+
+func _loop_stream(name: String, intro: AudioStream = null) -> AudioStream:
+	var source := stream(name)
+	if source is AudioStreamWAV:
+		var loop: AudioStreamWAV = source.duplicate()
+		loop.loop_mode = AudioStreamWAV.LOOP_FORWARD
+		loop.loop_begin = 0
+		loop.loop_end = roundi(loop.get_length() * loop.mix_rate)
+		if intro is AudioStreamWAV and intro.format == loop.format and intro.mix_rate == loop.mix_rate and intro.stereo == loop.stereo:
+			var intro_frames := roundi(intro.get_length() * intro.mix_rate)
+			loop.data = intro.data + loop.data
+			loop.loop_begin = intro_frames
+			loop.loop_end += intro_frames
+		return loop
+	return source
+
+func _ambient_finished() -> void:
+	if background.is_empty(): return
+	intro_pending = false
+	ambience.stream = _loop_stream(background)
+	if ambience.stream != null: ambience.play()
+
+func stop_all() -> void:
+	background = ""
+	death_tail = false
+	intro_pending = false
+	if death_cutoff != null: death_cutoff.stop()
+	if ambience != null: ambience.stop()
+	for voice in effects: voice.stop()