Expand and stage boss encounter

audio/Sfx.gd

@@ -27,6 +27,7 @@ const SHIP_DEATH: String = "ship_death"
 const ENEMY_DEATH: String = "enemy_death"
 const BUILDING_DEATH: String = "building_death"
 const DIALOG: String = "dialog"
+const BOSS_SCREAM: String = "boss_scream"
 
 const SOUNDS: Dictionary = {
 	SHOT: "res://audio/sfx_shot.wav",
@@ -34,6 +35,7 @@ const SOUNDS: Dictionary = {
 	ENEMY_DEATH: "res://audio/sfx_ship_death.wav",
 	BUILDING_DEATH: "res://audio/sfx_building_death.wav",
 	DIALOG: "res://audio/sfx_dialog.wav",
+	BOSS_SCREAM: "res://audio/sfx_boss_scream.wav",
 }
 
 # Per-sound level. A shot is fired constantly and a death happens once, so
@@ -44,6 +46,7 @@ const LEVELS: Dictionary = {
 	ENEMY_DEATH: -23.0,
 	BUILDING_DEATH: -23.0,
 	DIALOG: -19.0,
+	BOSS_SCREAM: -13.0,
 }
 
 # Shots vary a little in pitch so a stream of them does not turn into one

audio/make_sfx.py

@@ -183,9 +183,32 @@ def explosion(seconds, sub_from, sub_to, roar_seed, debris_level, drive):
     return [_saturate(v, drive) * _attack(i, 0.001) for i, v in enumerate(mixed)]
 
 
+def boss_scream(seconds=1.65):
+    """A huge synthetic creature waking: a rough falling throat tone with
+    an unstable upper rasp. Long enough to carry the reveal shake, without
+    borrowing a human/animal recording whose licence would need tracking."""
+    n = int(RATE * seconds)
+    throat = [0.0] * n
+    phase = 0.0
+    for i in range(n):
+        t = i / n
+        hz = 118.0 * (52.0 / 118.0) ** (t ** 0.72)
+        hz *= 1.0 + 0.07 * math.sin(t * math.pi * 17.0)
+        phase += 2.0 * math.pi * hz / RATE
+        envelope = min(1.0, t / 0.06) * (1.0 - t) ** 0.75
+        throat[i] = (math.sin(phase) * 0.75 + math.sin(phase * 2.03) * 0.32
+                     + math.sin(phase * 3.97) * 0.16) * envelope
+    rasp_noise = _noise(n, 189, lambda t: 0.34 * (1.0 - t) + 0.025)
+    rasp = [value * min(1.0, i / (RATE * 0.025)) * _decay(i, n, 1.15) * 0.68
+            for i, value in enumerate(rasp_noise)]
+    mixed = _mix(throat, rasp)
+    return [_saturate(value, 3.2) for value in mixed]
+
+
 if __name__ == "__main__":
     _write("sfx_shot", shot())
     _write("sfx_dialog", dialog())
+    _write("sfx_boss_scream", boss_scream())
     # A vessel coming apart: bright, fast, with real low end under it.
     _write("sfx_ship_death", explosion(1.45, 260.0, 38.0, 5, 0.16, 2.6))
     # A structure: longer, deeper, and it keeps coming down afterwards.

audio/sfx_boss_scream.wav.import

@@ -0,0 +1,24 @@
+[remap]
+
+importer="wav"
+type="AudioStreamWAV"
+uid="uid://disto7xb3s8gx"
+path="res://.godot/imported/sfx_boss_scream.wav-bf123df4e039686a30aabf3e3bb9dd12.sample"
+
+[deps]
+
+source_file="res://audio/sfx_boss_scream.wav"
+dest_files=["res://.godot/imported/sfx_boss_scream.wav-bf123df4e039686a30aabf3e3bb9dd12.sample"]
+
+[params]
+
+force/8_bit=false
+force/mono=false
+force/max_rate=false
+force/max_rate_hz=44100
+edit/trim=false
+edit/normalize=false
+edit/loop_mode=0
+edit/loop_begin=0
+edit/loop_end=-1
+compress/mode=2