1 files changed, 48 insertions, 0 deletions
diff --git a/home/fade_audio.asm b/home/fade_audio.asm
new file mode 100644
index 00000000..4ad2607d
--- /dev/null
+++ b/home/fade_audio.asm
@@ -0,0 +1,48 @@
+FadeOutAudio::
+	ld a, [wAudioFadeOutControl]
+	and a ; currently fading out audio?
+	jr nz, .fadingOut
+	ld a, [wd72c]
+	bit 1, a
+	ret nz
+	ld a, $77
+	ldh [rNR50], a
+	ret
+.fadingOut
+	ld a, [wAudioFadeOutCounter]
+	and a
+	jr z, .counterReachedZero
+	dec a
+	ld [wAudioFadeOutCounter], a
+	ret
+.counterReachedZero
+	ld a, [wAudioFadeOutCounterReloadValue]
+	ld [wAudioFadeOutCounter], a
+	ldh a, [rNR50]
+	and a ; has the volume reached 0?
+	jr z, .fadeOutComplete
+	ld b, a
+	and $f
+	dec a
+	ld c, a
+	ld a, b
+	and $f0
+	swap a
+	dec a
+	swap a
+	or c
+	ldh [rNR50], a
+	ret
+.fadeOutComplete
+	ld a, [wAudioFadeOutControl]
+	ld b, a
+	xor a
+	ld [wAudioFadeOutControl], a
+	ld a, SFX_STOP_ALL_MUSIC
+	ld [wNewSoundID], a
+	call PlaySound
+	ld a, [wAudioSavedROMBank]
+	ld [wAudioROMBank], a
+	ld a, b
+	ld [wNewSoundID], a
+	jp PlaySound