JuggleBoard game v0.1: Godot 4.7 arcade, combo decay, config menu, circus BGM

2026-08-10 18:38:45 +02:00
commit 7a2a00aa21
21 changed files with 1133 additions and 0 deletions
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+extends RefCounted
+## Genera proceduralmente un loop musicale da circo (valzer calliope) in WAV.
+## Nessun file audio esterno: tutto sintetizzato a runtime, con loop seamless.
+
+const SR := 22050
+
+
+static func generate() -> AudioStreamWAV:
+	var bpm := 132.0
+	var beat := 60.0 / bpm
+	var bars := 8
+	var total_beats := bars * 3
+	var total_seconds := total_beats * beat
+	var n := int(SR * total_seconds)
+	var mix := PackedFloat32Array()
+	mix.resize(n)
+
+	# Melodia (calliope) — 8 battute in 3/4
+	var melody := [
+		[72, 1.0], [76, 1.0], [79, 1.0],
+		[72, 1.0], [76, 1.0], [79, 1.0],
+		[69, 1.0], [72, 1.0], [76, 1.0],
+		[69, 1.0], [72, 1.0], [76, 1.0],
+		[65, 1.0], [69, 1.0], [72, 1.0],
+		[65, 1.0], [69, 1.0], [72, 1.0],
+		[67, 1.0], [71, 1.0], [74, 1.0],
+		[72, 2.0], [0, 1.0],
+	]
+	# Accompagnamento oom-pah-pah: [basso, [accordo]]
+	var chords := [
+		[48, [60, 64, 67]],
+		[48, [60, 64, 67]],
+		[45, [57, 60, 64]],
+		[45, [57, 60, 64]],
+		[41, [53, 57, 60]],
+		[41, [53, 57, 60]],
+		[43, [55, 59, 62]],
+		[48, [60, 64, 67]],
+	]
+
+	# Melodia
+	var t := 0.0
+	for note in melody:
+		var midi: int = note[0]
+		var beats: float = note[1]
+		var dur := beats * beat
+		if midi > 0:
+			_add_note(mix, t, dur, _freq(midi), 0.5, "calliope")
+		t += dur
+
+	# Accompagnamento
+	t = 0.0
+	for bar in bars:
+		var bass: int = chords[bar][0]
+		var chord: Array = chords[bar][1]
+		_add_note(mix, t, beat * 0.9, _freq(bass), 0.42, "bass")
+		for b in [1, 2]:
+			var ct: float = t + b * beat
+			for m in chord:
+				_add_note(mix, ct, beat * 0.8, _freq(int(m)), 0.16, "chord")
+		t += 3.0 * beat
+
+	# Fade in/out (30ms) per loop seamless senza click
+	var fade := int(SR * 0.03)
+	for i in fade:
+		var g := float(i) / fade
+		mix[i] *= g
+		mix[n - 1 - i] *= g
+
+	# Normalizzazione
+	var peak := 0.0
+	for i in n:
+		var a := absf(mix[i])
+		if a > peak:
+			peak = a
+	var norm := 1.0
+	if peak > 0.0:
+		norm = 0.9 / peak
+
+	var data := PackedByteArray()
+	data.resize(n)
+	for i in n:
+		var v := int(clampf(mix[i] * norm * 127.0, -128.0, 127.0))
+		data[i] = v & 0xFF
+
+	var stream := AudioStreamWAV.new()
+	stream.format = AudioStreamWAV.FORMAT_8_BITS
+	stream.mix_rate = SR
+	stream.data = data
+	stream.loop_mode = AudioStreamWAV.LOOP_FORWARD
+	stream.loop_begin = 0
+	stream.loop_end = n
+	return stream
+
+
+static func _freq(midi: int) -> float:
+	return 440.0 * pow(2.0, (midi - 69) / 12.0)
+
+
+static func _square(t: float, f: float) -> float:
+	return 1.0 if sin(t * f * TAU) > 0.0 else -1.0
+
+
+static func _saw(t: float, f: float) -> float:
+	return fmod(t * f, 1.0) * 2.0 - 1.0
+
+
+static func _envelope(t: float, dur: float) -> float:
+	var a := 0.02
+	var r := 0.06
+	var e := 1.0
+	if t < a:
+		e = t / a
+	var rem := dur - t
+	if rem < r:
+		e = minf(e, rem / r)
+	return e
+
+
+static func _add_note(mix: PackedFloat32Array, start: float, dur: float, freq: float, amp: float, kind: String) -> void:
+	var start_i := int(start * SR)
+	var cnt := int(dur * SR)
+	for i in cnt:
+		var idx := start_i + i
+		if idx < 0 or idx >= mix.size():
+			break
+		var t := float(i) / SR
+		var env := _envelope(t, dur)
+		var s := 0.0
+		if kind == "calliope":
+			var vib := 1.0 + 0.006 * sin(t * 2.0 * PI * 5.0)
+			var f := freq * vib
+			s = 0.5 * _square(t, f) + 0.3 * _saw(t, f * 1.004) + 0.2 * _square(t, f * 0.996)
+		elif kind == "bass":
+			s = 0.6 * _saw(t, freq) + 0.4 * _square(t, freq)
+		elif kind == "chord":
+			s = 0.5 * _square(t, freq) + 0.5 * _saw(t, freq)
+		mix[idx] += s * env * amp