Added Glitch Room Source code to Gitty

games/missile_command/arcade_audio.gd

@@ -0,0 +1,42 @@
+extends Node
+## Small synthesized arcade effects; no external audio assets required.
+var voices: Array[AudioStreamPlayer] = []
+var sounds: Dictionary = {}
+var voice_index := 0
+func _ready() -> void:
+	for i in range(6):
+		var voice := AudioStreamPlayer.new()
+		voice.volume_db = -17.0
+		add_child(voice)
+		voices.append(voice)
+	sounds["fire"] = tone(1300.0, 220.0, 0.09)
+	sounds["hit"] = tone(170.0, 40.0, 0.18)
+	sounds["zap"] = tone(1700.0, 70.0, 0.55)
+	sounds["death"] = tone(440.0, 35.0, 0.7)
+	sounds["level"] = tone(220.0, 880.0, 0.4)
+func tone(start: float, finish: float, duration: float) -> AudioStreamWAV:
+	var samples := PackedByteArray()
+	var count := int(22050 * duration)
+	samples.resize(count * 2)
+	var phase := 0.0
+	for i in range(count):
+		var t := float(i) / count
+		phase += lerpf(start, finish, t) * TAU / 22050.0
+		var envelope := minf(t * 50.0, 1.0) * pow(1.0 - t, 1.5)
+		var value := int((sin(phase) + sin(phase * 2.0) * 0.25) * envelope * 18000)
+		samples.encode_s16(i * 2, value)
+	var stream := AudioStreamWAV.new()
+	stream.format = AudioStreamWAV.FORMAT_16_BITS
+	stream.mix_rate = 22050
+	stream.data = samples
+	return stream
+func play(effect: String) -> void:
+	if not sounds.has(effect) or voices.is_empty():
+		return
+	var voice := voices[voice_index]
+	voice_index = (voice_index + 1) % voices.size()
+	voice.stream = sounds[effect]
+	voice.play()
+func stop() -> void:
+	for voice in voices:
+		voice.stop()