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; The fourth of four partially duplicated sound engines.
Audio4_PlaySound::
ld [wSoundID], a
ld a, [wSoundID]
cp $ff
jp z, .stopAllAudio
cp MAX_SFX_ID_4
jp z, .playSfx
jp c, .playSfx
cp $a3
jr z, .playMusic
jp nc, .playSfx
.playMusic
call InitMusicVariables
jp .playSoundCommon
.playSfx
ld l, a
ld e, a
ld h, 0
ld d, h
add hl, hl
add hl, de
ld de, SFX_Headers_4
add hl, de
ld a, h
ld [wSfxHeaderPointer], a
ld a, l
ld [wSfxHeaderPointer + 1], a
ld a, [hl]
and $c0
rlca
rlca
ld c, a
.sfxChannelLoop
ld d, c
ld a, c
add a
add c
ld c, a
ld b, 0
ld a, [wSfxHeaderPointer]
ld h, a
ld a, [wSfxHeaderPointer + 1]
ld l, a
add hl, bc
ld c, d
ld a, [hl]
and $f
ld e, a ; software channel ID
ld d, 0
ld hl, wChannelSoundIDs
add hl, de
ld a, [hl]
and a
jr z, .playChannel
ld a, e
cp Ch8
jr nz, .notNoiseChannel
ld a, [wSoundID]
cp NOISE_INSTRUMENTS_END
jr nc, .notNoiseInstrument
ret
.notNoiseInstrument
ld a, [hl]
cp NOISE_INSTRUMENTS_END
jr z, .playChannel
jr c, .playChannel
.notNoiseChannel
ld a, [wSoundID]
cp [hl]
jr z, .playChannel
jr c, .playChannel
ret
.playChannel
call InitSFXVariables
ld a, c
and a
jp z, .playSoundCommon
dec c
jp .sfxChannelLoop
.stopAllAudio
call StopAllAudio
ret
.playSoundCommon
ld a, [wSoundID]
ld l, a
ld e, a
ld h, 0
ld d, h
add hl, hl
add hl, de
ld de, SFX_Headers_4
add hl, de
ld e, l
ld d, h
ld hl, wChannelCommandPointers
ld a, [de] ; get channel number
ld b, a
rlca
rlca
and $3
ld c, a
ld a, b
and $f
ld b, c
inc b
inc de
ld c, 0
.commandPointerLoop
cp c
jr z, .next
inc c
inc hl
inc hl
jr .commandPointerLoop
.next
push af
push hl
push bc
ld b, 0
ld c, a
cp Ch4
jr c, .skipSettingFlag
ld hl, wChannelFlags1
add hl, bc
set BIT_NOISE_OR_SFX, [hl]
.skipSettingFlag
pop bc
pop hl
ld a, [de] ; get channel pointer
ld [hli], a
inc de
ld a, [de]
ld [hli], a
inc de
pop af
push hl
push bc
ld b, 0
ld c, a
ld hl, wChannelSoundIDs
add hl, bc
ld a, [wSoundID]
ld [hl], a
pop bc
pop hl
inc c
dec b
ld a, b
and a
ld a, [de]
inc de
jr nz, .commandPointerLoop
ld a, [wSoundID]
cp CRY_SFX_START
jr nc, .maybeCry
jr .done
.maybeCry
ld a, [wSoundID]
cp CRY_SFX_END
jr z, .done
jr c, .cry
jr .done
.cry
ld hl, wChannelSoundIDs + Ch5
ld [hli], a
ld [hli], a
ld [hli], a
ld [hl], a
ld hl, wChannelCommandPointers + Ch7 * 2 ; sfx wave channel pointer
ld de, Audio4_CryRet
ld [hl], e
inc hl
ld [hl], d ; overwrite pointer to point to sound_ret
ld a, [wSavedVolume]
and a
jr nz, .done
ldh a, [rNR50]
ld [wSavedVolume], a
ld a, $77
ldh [rNR50], a ; full volume
.done
ret
Audio4_CryRet:
sound_ret
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