mirror of
https://gitlab.com/xCrystal/pokecrystal-board.git
synced 2024-09-09 09:51:34 -07:00
3318 lines
53 KiB
NASM
3318 lines
53 KiB
NASM
; The entire sound engine. Uses section "audio" in WRAM.
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; Interfaces are in bank 0.
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; Notable functions:
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; FadeMusic
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; PlayStereoSFX
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_MapSetup_Sound_Off:: ; e8000
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; restart sound operation
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; clear all relevant hardware registers & wram
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push hl
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push de
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push bc
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push af
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call MusicOff
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ld hl, rNR50 ; channel control registers
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xor a
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ld [hli], a ; rNR50 ; volume/vin
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ld [hli], a ; rNR51 ; sfx channels
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ld a, $80 ; all channels on
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ld [hli], a ; ff26 ; music channels
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ld hl, rNR10 ; sound channel registers
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ld e, $4 ; number of channels
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.clearsound
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; sound channel 1 2 3 4
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xor a
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ld [hli], a ; rNR10, rNR20, rNR30, rNR40 ; sweep = 0
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ld [hli], a ; rNR11, rNR21, rNR31, rNR41 ; length/wavepattern = 0
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ld a, $8
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ld [hli], a ; rNR12, rNR22, rNR32, rNR42 ; envelope = 0
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xor a
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ld [hli], a ; rNR13, rNR23, rNR33, rNR43 ; frequency lo = 0
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ld a, $80
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ld [hli], a ; rNR14, rNR24, rNR34, rNR44 ; restart sound (freq hi = 0)
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dec e
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jr nz, .clearsound
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ld hl, Channel1 ; start of channel data
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ld de, $1bf ; length of area to clear (entire sound wram area)
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.clearchannels ; clear Channel1-$c2bf
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xor a
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ld [hli], a
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dec de
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ld a, e
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or d
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jr nz, .clearchannels
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ld a, $77 ; max
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ld [Volume], a
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call MusicOn
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pop af
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pop bc
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pop de
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pop hl
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ret
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; e803d
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MusicFadeRestart: ; e803d
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; restart but keep the music id to fade in to
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ld a, [MusicFadeIDHi]
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push af
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ld a, [MusicFadeIDLo]
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push af
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call _MapSetup_Sound_Off
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pop af
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ld [MusicFadeIDLo], a
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pop af
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ld [MusicFadeIDHi], a
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ret
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; e8051
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MusicOn: ; e8051
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ld a, 1
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ld [MusicPlaying], a
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ret
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; e8057
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MusicOff: ; e8057
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xor a
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ld [MusicPlaying], a
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ret
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; e805c
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_UpdateSound:: ; e805c
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; called once per frame
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; no use updating audio if it's not playing
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ld a, [MusicPlaying]
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and a
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ret z
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; start at ch1
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xor a
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ld [CurChannel], a ; just
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ld [SoundOutput], a ; off
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ld bc, Channel1
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.loop
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; is the channel active?
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ld hl, Channel1Flags - Channel1
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add hl, bc
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bit SOUND_CHANNEL_ON, [hl]
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jp z, .nextchannel
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; check time left in the current note
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ld hl, Channel1NoteDuration - Channel1
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add hl, bc
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ld a, [hl]
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cp $2 ; 1 or 0?
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jr c, .noteover
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dec [hl]
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jr .asm_e8093
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.noteover
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; reset vibrato delay
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ld hl, Channel1VibratoDelay - Channel1
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add hl, bc
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ld a, [hl]
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ld hl, Channel1VibratoDelayCount - Channel1
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add hl, bc
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ld [hl], a
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; turn vibrato off for now
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ld hl, Channel1Flags2 - Channel1
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add hl, bc
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res SOUND_UNKN_09, [hl]
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; get next note
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call ParseMusic
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.asm_e8093
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;
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call Functione84f9
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; duty cycle
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ld hl, Channel1DutyCycle - Channel1
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add hl, bc
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ld a, [hli]
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ld [wCurTrackDuty], a
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; intensity
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ld a, [hli]
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ld [wCurTrackIntensity], a
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; frequency
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ld a, [hli]
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ld [wCurTrackFrequency], a
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ld a, [hl]
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ld [wCurTrackFrequency + 1], a
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;
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call Functione8466 ; handle vibrato and other things
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call HandleNoise
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; turn off music when playing sfx?
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ld a, [SFXPriority]
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and a
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jr z, .next
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; are we in a sfx channel right now?
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ld a, [CurChannel]
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cp $4
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jr nc, .next
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; are any sfx channels active?
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; if so, mute
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ld hl, Channel5Flags
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bit SOUND_CHANNEL_ON, [hl]
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jr nz, .restnote
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ld hl, Channel6Flags
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bit SOUND_CHANNEL_ON, [hl]
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jr nz, .restnote
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ld hl, Channel7Flags
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bit SOUND_CHANNEL_ON, [hl]
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jr nz, .restnote
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ld hl, Channel8Flags
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bit SOUND_CHANNEL_ON, [hl]
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jr z, .next
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.restnote
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ld hl, Channel1NoteFlags - Channel1
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add hl, bc
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set NOTE_REST, [hl] ; Rest
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.next
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; are we in a sfx channel right now?
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ld a, [CurChannel]
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cp $4 ; sfx
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jr nc, .asm_e80ee
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ld hl, Channel5Flags - Channel1
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add hl, bc
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bit SOUND_CHANNEL_ON, [hl]
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jr nz, .asm_e80fc
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.asm_e80ee
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call UpdateChannels
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ld hl, Channel1Tracks - Channel1
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add hl, bc
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ld a, [SoundOutput]
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or [hl]
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ld [SoundOutput], a
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.asm_e80fc
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; clear note flags
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ld hl, Channel1NoteFlags - Channel1
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add hl, bc
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xor a
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ld [hl], a
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.nextchannel
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; next channel
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ld hl, Channel2 - Channel1
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add hl, bc
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ld c, l
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ld b, h
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ld a, [CurChannel]
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inc a
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ld [CurChannel], a
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cp $8 ; are we done?
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jp nz, .loop ; do it all again
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call PlayDanger
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; fade music in/out
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call FadeMusic
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; write volume to hardware register
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ld a, [Volume]
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ld [rNR50], a
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; write SO on/off to hardware register
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ld a, [SoundOutput]
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ld [rNR51], a
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ret
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; e8125
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UpdateChannels: ; e8125
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ld hl, .ChannelFnPtrs
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ld a, [CurChannel]
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and $7
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add a
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ld e, a
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ld d, 0
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add hl, de
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ld a, [hli]
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ld h, [hl]
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ld l, a
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jp [hl]
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.ChannelFnPtrs
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dw .Channel1
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dw .Channel2
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dw .Channel3
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dw .Channel4
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; sfx ch ptrs are identical to music chs
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; ..except 5
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dw .Channel5
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dw .Channel6
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dw .Channel7
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dw .Channel8
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.Channel1
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ld a, [Danger]
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bit 7, a
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ret nz
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.Channel5
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ld hl, Channel1NoteFlags - Channel1
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add hl, bc
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bit NOTE_UNKN_3, [hl]
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jr z, .asm_e8159
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;
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ld a, [SoundInput]
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ld [rNR10], a
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.asm_e8159
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bit NOTE_REST, [hl] ; rest
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jr nz, .ch1rest
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bit NOTE_UNKN_4, [hl]
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jr nz, .asm_e81a2
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bit NOTE_UNKN_1, [hl]
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jr nz, .asm_e816b
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bit NOTE_UNKN_6, [hl]
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jr nz, .asm_e8184
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jr .asm_e8175
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.asm_e816b
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ld a, [wCurTrackFrequency]
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ld [rNR13], a
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ld a, [wCurTrackFrequency + 1]
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ld [rNR14], a
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.asm_e8175
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bit NOTE_UNKN_0, [hl]
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ret z
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ld a, [wCurTrackDuty]
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ld d, a
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ld a, [rNR11]
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and $3f ; sound length
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or d
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ld [rNR11], a
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ret
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.asm_e8184
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ld a, [wCurTrackDuty]
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ld d, a
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ld a, [rNR11]
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and $3f ; sound length
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or d
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ld [rNR11], a
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ld a, [wCurTrackFrequency]
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ld [rNR13], a
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ret
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.ch1rest
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ld a, [rNR52]
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and %10001110 ; ch1 off
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ld [rNR52], a
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ld hl, rNR10
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call ClearChannel
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ret
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.asm_e81a2
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ld hl, wCurTrackDuty
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ld a, $3f ; sound length
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or [hl]
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ld [rNR11], a
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ld a, [wCurTrackIntensity]
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ld [rNR12], a
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ld a, [wCurTrackFrequency]
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ld [rNR13], a
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ld a, [wCurTrackFrequency + 1]
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or $80
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ld [rNR14], a
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ret
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.Channel2
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.Channel6
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ld hl, Channel1NoteFlags - Channel1
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add hl, bc
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bit NOTE_REST, [hl] ; rest
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jr nz, .ch2rest
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bit NOTE_UNKN_4, [hl]
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jr nz, .asm_e8204
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bit NOTE_UNKN_6, [hl]
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jr nz, .asm_e81e6
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bit NOTE_UNKN_0, [hl]
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ret z
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ld a, [wCurTrackDuty]
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ld d, a
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ld a, [rNR21]
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and $3f ; sound length
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or d
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ld [rNR21], a
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ret
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.asm_e81db ; unused
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ld a, [wCurTrackFrequency]
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ld [rNR23], a
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ld a, [wCurTrackFrequency + 1]
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ld [rNR24], a
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ret
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.asm_e81e6
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ld a, [wCurTrackDuty]
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ld d, a
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ld a, [rNR21]
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and $3f ; sound length
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or d
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ld [rNR21], a
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ld a, [wCurTrackFrequency]
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ld [rNR23], a
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ret
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.ch2rest
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ld a, [rNR52]
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and %10001101 ; ch2 off
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ld [rNR52], a
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ld hl, rNR20
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call ClearChannel
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ret
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.asm_e8204
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ld hl, wCurTrackDuty
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ld a, $3f ; sound length
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or [hl]
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ld [rNR21], a
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ld a, [wCurTrackIntensity]
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ld [rNR22], a
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ld a, [wCurTrackFrequency]
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ld [rNR23], a
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ld a, [wCurTrackFrequency + 1]
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or $80 ; initial (restart)
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ld [rNR24], a
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ret
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.Channel3
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.Channel7
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ld hl, Channel1NoteFlags - Channel1
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add hl, bc
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bit NOTE_REST, [hl] ; rest
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jr nz, .ch3rest
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bit NOTE_UNKN_4, [hl]
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jr nz, .asm_e824d
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bit NOTE_UNKN_6, [hl]
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jr nz, .asm_e823a
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ret
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.asm_e822f ; unused
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ld a, [wCurTrackFrequency]
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ld [rNR33], a
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ld a, [wCurTrackFrequency + 1]
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ld [rNR34], a
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ret
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.asm_e823a
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ld a, [wCurTrackFrequency]
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ld [rNR33], a
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ret
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.ch3rest
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ld a, [rNR52]
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and %10001011 ; ch3 off
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ld [rNR52], a
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ld hl, rNR30
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call ClearChannel
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ret
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.asm_e824d
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ld a, $3f
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ld [rNR31], a
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xor a
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ld [rNR30], a
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call .asm_e8268
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ld a, $80
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ld [rNR30], a
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ld a, [wCurTrackFrequency]
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ld [rNR33], a
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ld a, [wCurTrackFrequency + 1]
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or $80
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ld [rNR34], a
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ret
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.asm_e8268
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push hl
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ld a, [wCurTrackIntensity]
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and $f ; only 0-9 are valid
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ld l, a
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ld h, 0
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; hl << 4
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; each wavepattern is $f bytes long
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; so seeking is done in $10s
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rept 4
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add hl, hl
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endr
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ld de, WaveSamples
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add hl, de
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; load wavepattern into rWave_0-rWave_f
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ld a, [hli]
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ld [rWave_0], a
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ld a, [hli]
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ld [rWave_1], a
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ld a, [hli]
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ld [rWave_2], a
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ld a, [hli]
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ld [rWave_3], a
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ld a, [hli]
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ld [rWave_4], a
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ld a, [hli]
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ld [rWave_5], a
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ld a, [hli]
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ld [rWave_6], a
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ld a, [hli]
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ld [rWave_7], a
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ld a, [hli]
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ld [rWave_8], a
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ld a, [hli]
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ld [rWave_9], a
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ld a, [hli]
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ld [rWave_a], a
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ld a, [hli]
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ld [rWave_b], a
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ld a, [hli]
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ld [rWave_c], a
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ld a, [hli]
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ld [rWave_d], a
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ld a, [hli]
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ld [rWave_e], a
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ld a, [hli]
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ld [rWave_f], a
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pop hl
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ld a, [wCurTrackIntensity]
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and $f0
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sla a
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ld [rNR32], a
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ret
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.Channel4
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.Channel8
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ld hl, Channel1NoteFlags - Channel1
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add hl, bc
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bit NOTE_REST, [hl] ; rest
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jr nz, .ch4rest
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bit NOTE_UNKN_4, [hl]
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jr nz, .asm_e82d4
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ret
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.asm_e82c1 ; unused
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ld a, [wCurTrackFrequency]
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ld [rNR43], a
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ret
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.ch4rest
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ld a, [rNR52]
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and %10000111 ; ch4 off
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ld [rNR52], a
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ld hl, rNR40
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call ClearChannel
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ret
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.asm_e82d4
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ld a, $3f ; sound length
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ld [rNR41], a
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ld a, [wCurTrackIntensity]
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ld [rNR42], a
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ld a, [wCurTrackFrequency]
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ld [rNR43], a
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ld a, $80
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ld [rNR44], a
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ret
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; e82e7
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_CheckSFX: ; e82e7
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; return carry if any sfx channels are active
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ld hl, Channel5Flags
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bit SOUND_CHANNEL_ON, [hl]
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jr nz, .sfxon
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ld hl, Channel6Flags
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bit SOUND_CHANNEL_ON, [hl]
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jr nz, .sfxon
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ld hl, Channel7Flags
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bit SOUND_CHANNEL_ON, [hl]
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jr nz, .sfxon
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ld hl, Channel8Flags
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bit SOUND_CHANNEL_ON, [hl]
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jr nz, .sfxon
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and a
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ret
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.sfxon
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scf
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ret
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; e8307
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PlayDanger: ; e8307
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ld a, [Danger]
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bit 7, a
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ret z
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and $7f
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ld d, a
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call _CheckSFX
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jr c, .asm_e8335
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and a
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jr z, .asm_e8323
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cp 16 ; halfway
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jr z, .asm_e831e
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jr .asm_e8335
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.asm_e831e
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ld hl, Tablee8354
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jr .updatehw
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.asm_e8323
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ld hl, Tablee8350
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.updatehw
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xor a
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ld [rNR10], a ; sweep off
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ld a, [hli]
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ld [rNR11], a ; sound length / duty cycle
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ld a, [hli]
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ld [rNR12], a ; ch1 volume envelope
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ld a, [hli]
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ld [rNR13], a ; ch1 frequency lo
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ld a, [hli]
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ld [rNR14], a ; ch1 frequency hi
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.asm_e8335
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ld a, d
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inc a
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cp 30
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jr c, .asm_e833c
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xor a
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.asm_e833c
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or $80
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ld [Danger], a
|
|
; is hw ch1 on?
|
|
ld a, [SoundOutput]
|
|
and $11
|
|
ret nz
|
|
; if not, turn it on
|
|
ld a, [SoundOutput]
|
|
or $11
|
|
ld [SoundOutput], a
|
|
ret
|
|
|
|
; e8350
|
|
|
|
Tablee8350: ; e8350
|
|
db $80 ; duty 50%
|
|
db $e2 ; volume 14, envelope decrease sweep 2
|
|
db $50 ; frequency: $750
|
|
db $87 ; restart sound
|
|
; e8354
|
|
|
|
Tablee8354: ; e8354
|
|
db $80 ; duty 50%
|
|
db $e2 ; volume 14, envelope decrease sweep 2
|
|
db $ee ; frequency: $6ee
|
|
db $86 ; restart sound
|
|
; e8358
|
|
|
|
FadeMusic: ; e8358
|
|
; fade music if applicable
|
|
; usage:
|
|
; write to MusicFade
|
|
; song fades out at the given rate
|
|
; load song id in MusicFadeID
|
|
; fade new song in
|
|
; notes:
|
|
; max # frames per volume level is $3f
|
|
|
|
; fading?
|
|
ld a, [MusicFade]
|
|
and a
|
|
ret z
|
|
; has the count ended?
|
|
ld a, [MusicFadeCount]
|
|
and a
|
|
jr z, .update
|
|
; count down
|
|
dec a
|
|
ld [MusicFadeCount], a
|
|
ret
|
|
|
|
.update
|
|
ld a, [MusicFade]
|
|
ld d, a
|
|
; get new count
|
|
and $3f
|
|
ld [MusicFadeCount], a
|
|
; get SO1 volume
|
|
ld a, [Volume]
|
|
and $7
|
|
; which way are we fading?
|
|
bit 7, d
|
|
jr nz, .fadein
|
|
; fading out
|
|
and a
|
|
jr z, .novolume
|
|
dec a
|
|
jr .updatevolume
|
|
|
|
|
|
.novolume
|
|
; make sure volume is off
|
|
xor a
|
|
ld [Volume], a
|
|
; did we just get on a bike?
|
|
ld a, [PlayerState]
|
|
cp $1 ; bicycle
|
|
jr z, .bicycle
|
|
push bc
|
|
; restart sound
|
|
call MusicFadeRestart
|
|
; get new song id
|
|
ld a, [MusicFadeIDLo]
|
|
and a
|
|
jr z, .quit ; this assumes there are fewer than 256 songs!
|
|
ld e, a
|
|
ld a, [MusicFadeIDHi]
|
|
ld d, a
|
|
; load new song
|
|
call _PlayMusic
|
|
.quit
|
|
; cleanup
|
|
pop bc
|
|
; stop fading
|
|
xor a
|
|
ld [MusicFade], a
|
|
ret
|
|
|
|
.bicycle
|
|
push bc
|
|
; restart sound
|
|
call MusicFadeRestart
|
|
; this turns the volume up
|
|
; turn it back down
|
|
xor a
|
|
ld [Volume], a
|
|
; get new song id
|
|
ld a, [MusicFadeIDLo]
|
|
ld e, a
|
|
ld a, [MusicFadeIDHi]
|
|
ld d, a
|
|
; load new song
|
|
call _PlayMusic
|
|
pop bc
|
|
; fade in
|
|
ld hl, MusicFade
|
|
set 7, [hl]
|
|
ret
|
|
|
|
.fadein
|
|
; are we done?
|
|
cp $7
|
|
jr nc, .maxvolume
|
|
; inc volume
|
|
inc a
|
|
jr .updatevolume
|
|
|
|
.maxvolume
|
|
; we're done
|
|
xor a
|
|
ld [MusicFade], a
|
|
ret
|
|
|
|
.updatevolume
|
|
; hi = lo
|
|
ld d, a
|
|
swap a
|
|
or d
|
|
ld [Volume], a
|
|
ret
|
|
|
|
; e83d1
|
|
|
|
LoadNote: ; e83d1
|
|
; check mute??
|
|
ld hl, Channel1Flags2 - Channel1
|
|
add hl, bc
|
|
bit SOUND_UNKN_09, [hl]
|
|
ret z
|
|
; get note duration
|
|
ld hl, Channel1NoteDuration - Channel1
|
|
add hl, bc
|
|
ld a, [hl]
|
|
ld hl, wc297 ; ????
|
|
sub [hl]
|
|
jr nc, .ok
|
|
ld a, 1
|
|
.ok
|
|
ld [hl], a
|
|
; get frequency
|
|
ld hl, Channel1Frequency - Channel1
|
|
add hl, bc
|
|
ld e, [hl]
|
|
inc hl
|
|
ld d, [hl]
|
|
; ????
|
|
ld hl, Channel1Field0x21 - Channel1
|
|
add hl, bc
|
|
ld a, e
|
|
sub [hl]
|
|
ld e, a
|
|
ld a, d
|
|
sbc a, 0
|
|
ld d, a
|
|
; ????
|
|
ld hl, Channel1Field0x22 - Channel1
|
|
add hl, bc
|
|
sub [hl]
|
|
jr nc, .greater_than
|
|
; ????
|
|
ld hl, Channel1Flags3 - Channel1
|
|
add hl, bc
|
|
set SOUND_UNKN_11, [hl]
|
|
; get frequency
|
|
ld hl, Channel1Frequency - Channel1
|
|
add hl, bc
|
|
ld e, [hl]
|
|
inc hl
|
|
ld d, [hl]
|
|
; ????
|
|
ld hl, Channel1Field0x21 - Channel1
|
|
add hl, bc
|
|
ld a, [hl]
|
|
sub e
|
|
ld e, a
|
|
ld a, d
|
|
sbc a, 0
|
|
ld d, a
|
|
; ????
|
|
ld hl, Channel1Field0x22 - Channel1
|
|
add hl, bc
|
|
ld a, [hl]
|
|
sub d
|
|
ld d, a
|
|
jr .resume
|
|
|
|
.greater_than
|
|
; ????
|
|
ld hl, Channel1Flags3 - Channel1
|
|
add hl, bc
|
|
res SOUND_UNKN_11, [hl]
|
|
; get frequency
|
|
ld hl, Channel1Frequency - Channel1
|
|
add hl, bc
|
|
ld e, [hl]
|
|
inc hl
|
|
ld d, [hl]
|
|
; ????
|
|
ld hl, Channel1Field0x21 - Channel1
|
|
add hl, bc
|
|
ld a, e
|
|
sub [hl]
|
|
ld e, a
|
|
ld a, d
|
|
sbc a, 0
|
|
ld d, a
|
|
; ????
|
|
ld hl, Channel1Field0x22 - Channel1
|
|
add hl, bc
|
|
sub [hl]
|
|
ld d, a
|
|
.resume
|
|
push bc
|
|
ld hl, wc297
|
|
ld b, 0; loop count
|
|
.loop
|
|
inc b
|
|
ld a, e
|
|
sub [hl]
|
|
ld e, a
|
|
jr nc, .loop
|
|
ld a, d
|
|
and a
|
|
jr z, .quit
|
|
dec d
|
|
jr .loop
|
|
|
|
.quit
|
|
ld a, e ; result
|
|
add [hl]
|
|
ld d, b ; loop count
|
|
; ????
|
|
pop bc
|
|
ld hl, Channel1Field0x23 - Channel1
|
|
add hl, bc
|
|
ld [hl], d
|
|
ld hl, Channel1Field0x24 - Channel1
|
|
add hl, bc
|
|
ld [hl], a
|
|
; clear ????
|
|
ld hl, Channel1Field0x25 - Channel1
|
|
add hl, bc
|
|
xor a
|
|
ld [hl], a
|
|
ret
|
|
|
|
; e8466
|
|
|
|
Functione8466: ; e8466
|
|
; handle vibrato and other things
|
|
; unknowns: wCurTrackDuty, wCurTrackFrequency
|
|
ld hl, Channel1Flags2 - Channel1
|
|
add hl, bc
|
|
bit SOUND_DUTY, [hl] ; duty
|
|
jr z, .next
|
|
ld hl, Channel1Field0x1c - Channel1
|
|
add hl, bc
|
|
ld a, [hl]
|
|
rlca
|
|
rlca
|
|
ld [hl], a
|
|
and $c0
|
|
ld [wCurTrackDuty], a
|
|
ld hl, Channel1NoteFlags - Channel1
|
|
add hl, bc
|
|
set NOTE_UNKN_0, [hl]
|
|
.next
|
|
ld hl, Channel1Flags2 - Channel1
|
|
add hl, bc
|
|
bit SOUND_CRY_PITCH, [hl]
|
|
jr z, .vibrato
|
|
ld hl, Channel1CryPitch - Channel1
|
|
add hl, bc
|
|
ld e, [hl]
|
|
inc hl
|
|
ld d, [hl]
|
|
ld hl, wCurTrackFrequency
|
|
ld a, [hli]
|
|
ld h, [hl]
|
|
ld l, a
|
|
add hl, de
|
|
ld e, l
|
|
ld d, h
|
|
ld hl, wCurTrackFrequency
|
|
ld [hl], e
|
|
inc hl
|
|
ld [hl], d
|
|
.vibrato
|
|
; is vibrato on?
|
|
ld hl, Channel1Flags2 - Channel1
|
|
add hl, bc
|
|
bit SOUND_VIBRATO, [hl] ; vibrato
|
|
jr z, .quit
|
|
; is vibrato active for this note yet?
|
|
; is the delay over?
|
|
ld hl, Channel1VibratoDelayCount - Channel1
|
|
add hl, bc
|
|
ld a, [hl]
|
|
and a
|
|
jr nz, .subexit
|
|
; is the extent nonzero?
|
|
ld hl, Channel1VibratoExtent - Channel1
|
|
add hl, bc
|
|
ld a, [hl]
|
|
and a
|
|
jr z, .quit
|
|
; save it for later
|
|
ld d, a
|
|
; is it time to toggle vibrato up/down?
|
|
ld hl, Channel1VibratoRate - Channel1
|
|
add hl, bc
|
|
ld a, [hl]
|
|
and $f ; count
|
|
jr z, .toggle
|
|
.subexit
|
|
dec [hl]
|
|
jr .quit
|
|
|
|
.toggle
|
|
; refresh count
|
|
ld a, [hl]
|
|
swap [hl]
|
|
or [hl]
|
|
ld [hl], a
|
|
; ????
|
|
ld a, [wCurTrackFrequency]
|
|
ld e, a
|
|
; toggle vibrato up/down
|
|
ld hl, Channel1Flags3 - Channel1
|
|
add hl, bc
|
|
bit SOUND_VIBRATO_DIR, [hl] ; vibrato up/down
|
|
jr z, .down
|
|
; up
|
|
; vibrato down
|
|
res SOUND_VIBRATO_DIR, [hl]
|
|
; get the delay
|
|
ld a, d
|
|
and $f ; lo
|
|
;
|
|
ld d, a
|
|
ld a, e
|
|
sub d
|
|
jr nc, .asm_e84ef
|
|
ld a, 0
|
|
jr .asm_e84ef
|
|
|
|
.down
|
|
; vibrato up
|
|
set SOUND_VIBRATO_DIR, [hl]
|
|
; get the delay
|
|
ld a, d
|
|
and $f0 ; hi
|
|
swap a ; move it to lo
|
|
;
|
|
add e
|
|
jr nc, .asm_e84ef
|
|
ld a, $ff
|
|
.asm_e84ef
|
|
ld [wCurTrackFrequency], a
|
|
;
|
|
ld hl, Channel1NoteFlags - Channel1
|
|
add hl, bc
|
|
set NOTE_UNKN_6, [hl]
|
|
.quit
|
|
ret
|
|
|
|
; e84f9
|
|
|
|
Functione84f9: ; e84f9
|
|
; quit if ????
|
|
ld hl, Channel1Flags2 - Channel1
|
|
add hl, bc
|
|
bit SOUND_UNKN_09, [hl]
|
|
ret z
|
|
; de = Frequency
|
|
ld hl, Channel1Frequency - Channel1
|
|
add hl, bc
|
|
ld e, [hl]
|
|
inc hl
|
|
ld d, [hl]
|
|
;
|
|
ld hl, Channel1Flags3 - Channel1
|
|
add hl, bc
|
|
bit SOUND_UNKN_11, [hl]
|
|
jr z, .next
|
|
;
|
|
ld hl, Channel1Field0x23 - Channel1
|
|
add hl, bc
|
|
ld l, [hl]
|
|
ld h, 0
|
|
add hl, de
|
|
ld d, h
|
|
ld e, l
|
|
; get ????
|
|
ld hl, Channel1Field0x24 - Channel1
|
|
add hl, bc
|
|
ld a, [hl]
|
|
; add it to ????
|
|
ld hl, Channel1Field0x25 - Channel1
|
|
add hl, bc
|
|
add [hl]
|
|
ld [hl], a
|
|
ld a, 0
|
|
adc e
|
|
ld e, a
|
|
ld a, 0
|
|
adc d
|
|
ld d, a
|
|
;
|
|
ld hl, Channel1Field0x22 - Channel1
|
|
add hl, bc
|
|
ld a, [hl]
|
|
cp d
|
|
jp c, .quit1
|
|
jr nz, .quit2
|
|
ld hl, Channel1Field0x21 - Channel1
|
|
add hl, bc
|
|
ld a, [hl]
|
|
cp e
|
|
jp c, .quit1
|
|
jr .quit2
|
|
|
|
.next
|
|
ld a, e
|
|
ld hl, Channel1Field0x23 - Channel1
|
|
add hl, bc
|
|
ld e, [hl]
|
|
sub e
|
|
ld e, a
|
|
ld a, d
|
|
sbc a, 0
|
|
ld d, a
|
|
ld hl, Channel1Field0x24 - Channel1
|
|
add hl, bc
|
|
ld a, [hl]
|
|
add a
|
|
ld [hl], a
|
|
ld a, e
|
|
sbc a, 0
|
|
ld e, a
|
|
ld a, d
|
|
sbc a, 0
|
|
ld d,a
|
|
ld hl, Channel1Field0x22 - Channel1
|
|
add hl, bc
|
|
ld a, d
|
|
cp [hl]
|
|
jr c, .quit1
|
|
jr nz, .quit2
|
|
ld hl, Channel1Field0x21 - Channel1
|
|
add hl, bc
|
|
ld a, e
|
|
cp [hl]
|
|
jr nc, .quit2
|
|
.quit1
|
|
ld hl, Channel1Flags2 - Channel1
|
|
add hl, bc
|
|
res SOUND_UNKN_09, [hl]
|
|
ld hl, Channel1Flags3 - Channel1
|
|
add hl, bc
|
|
res SOUND_UNKN_11, [hl]
|
|
ret
|
|
|
|
.quit2
|
|
ld hl, Channel1Frequency - Channel1
|
|
add hl, bc
|
|
ld [hl], e
|
|
inc hl
|
|
ld [hl], d
|
|
ld hl, Channel1NoteFlags - Channel1
|
|
add hl, bc
|
|
set NOTE_UNKN_1, [hl]
|
|
set NOTE_UNKN_0, [hl]
|
|
ret
|
|
|
|
; e858c
|
|
|
|
HandleNoise: ; e858c
|
|
; is noise sampling on?
|
|
ld hl, Channel1Flags - Channel1
|
|
add hl, bc
|
|
bit SOUND_NOISE, [hl] ; noise sampling
|
|
ret z
|
|
; are we in a sfx channel?
|
|
ld a, [CurChannel]
|
|
bit 2, a ; sfx
|
|
jr nz, .next
|
|
; is ch8 on? (noise)
|
|
ld hl, Channel8Flags
|
|
bit SOUND_CHANNEL_ON, [hl] ; on?
|
|
jr z, .next
|
|
; is ch8 playing noise?
|
|
bit SOUND_NOISE, [hl]
|
|
ret nz ; quit if so
|
|
;
|
|
.next
|
|
ld a, [wNoiseSampleDelay]
|
|
and a
|
|
jr z, ReadNoiseSample
|
|
dec a
|
|
ld [wNoiseSampleDelay], a
|
|
ret
|
|
|
|
; e85af
|
|
|
|
ReadNoiseSample: ; e85af
|
|
; sample struct:
|
|
; [wx] [yy] [zz]
|
|
; w: ? either 2 or 3
|
|
; x: duration
|
|
; zz: intensity
|
|
; yy: frequency
|
|
|
|
; de = [NoiseSampleAddress]
|
|
ld hl, NoiseSampleAddress
|
|
ld e, [hl]
|
|
inc hl
|
|
ld d, [hl]
|
|
|
|
; is it empty?
|
|
ld a, e
|
|
or d
|
|
jr z, .quit
|
|
|
|
ld a, [de]
|
|
inc de
|
|
|
|
cp $ff
|
|
jr z, .quit
|
|
|
|
and $f
|
|
inc a
|
|
ld [wNoiseSampleDelay], a
|
|
ld a, [de]
|
|
inc de
|
|
ld [wCurTrackIntensity], a
|
|
ld a, [de]
|
|
inc de
|
|
ld [wCurTrackFrequency], a
|
|
xor a
|
|
ld [wCurTrackFrequency + 1], a
|
|
|
|
ld hl, NoiseSampleAddress
|
|
ld [hl], e
|
|
inc hl
|
|
ld [hl], d
|
|
|
|
ld hl, Channel1NoteFlags - Channel1
|
|
add hl, bc
|
|
set NOTE_UNKN_4, [hl]
|
|
ret
|
|
|
|
.quit
|
|
ret
|
|
|
|
; e85e1
|
|
|
|
ParseMusic: ; e85e1
|
|
; parses until a note is read or the song is ended
|
|
call GetMusicByte ; store next byte in a
|
|
cp $ff ; is the song over?
|
|
jr z, .endchannel
|
|
cp $d0 ; is it a note?
|
|
jr c, .readnote
|
|
; then it's a command
|
|
.readcommand
|
|
call ParseMusicCommand
|
|
jr ParseMusic ; start over
|
|
|
|
.readnote
|
|
; CurMusicByte contains current note
|
|
; special notes
|
|
ld hl, Channel1Flags - Channel1
|
|
add hl, bc
|
|
bit SOUND_SFX, [hl]
|
|
jp nz, Functione8698
|
|
bit SOUND_REST, [hl] ; rest
|
|
jp nz, Functione8698
|
|
bit SOUND_NOISE, [hl] ; noise sample
|
|
jp nz, GetNoiseSample
|
|
; normal note
|
|
; set note duration (bottom nybble)
|
|
ld a, [CurMusicByte]
|
|
and $f
|
|
call SetNoteDuration
|
|
; get note pitch (top nybble)
|
|
ld a, [CurMusicByte]
|
|
swap a
|
|
and $f
|
|
jr z, .rest ; pitch 0-> rest
|
|
; update pitch
|
|
ld hl, Channel1Pitch - Channel1
|
|
add hl, bc
|
|
ld [hl], a
|
|
; store pitch in e
|
|
ld e, a
|
|
; store octave in d
|
|
ld hl, Channel1Octave - Channel1
|
|
add hl, bc
|
|
ld d, [hl]
|
|
; update frequency
|
|
call GetFrequency
|
|
ld hl, Channel1Frequency - Channel1
|
|
add hl, bc
|
|
ld [hl], e
|
|
inc hl
|
|
ld [hl], d
|
|
; ????
|
|
ld hl, Channel1NoteFlags - Channel1
|
|
add hl, bc
|
|
set NOTE_UNKN_4, [hl]
|
|
jp LoadNote
|
|
|
|
|
|
|
|
.rest
|
|
; note = rest
|
|
ld hl, Channel1NoteFlags - Channel1
|
|
add hl, bc
|
|
set NOTE_REST, [hl] ; Rest
|
|
ret
|
|
|
|
;
|
|
.endchannel
|
|
; $ff is reached in music data
|
|
ld hl, Channel1Flags - Channel1
|
|
add hl, bc
|
|
bit SOUND_SUBROUTINE, [hl] ; in a subroutine?
|
|
jr nz, .readcommand ; execute
|
|
ld a, [CurChannel]
|
|
cp $4 ; channels 0-3?
|
|
jr nc, .chan_5to8
|
|
; ????
|
|
ld hl, Channel5Flags - Channel1
|
|
add hl, bc
|
|
bit SOUND_CHANNEL_ON, [hl]
|
|
jr nz, .ok
|
|
.chan_5to8
|
|
ld hl, Channel1Flags - Channel1
|
|
add hl, bc
|
|
bit SOUND_REST, [hl]
|
|
call nz, RestoreVolume
|
|
; end music
|
|
ld a, [CurChannel]
|
|
cp $4 ; channel 5?
|
|
jr nz, .ok
|
|
; ????
|
|
xor a
|
|
ld [rNR10], a ; sweep = 0
|
|
.ok
|
|
; stop playing
|
|
; turn channel off
|
|
ld hl, Channel1Flags - Channel1
|
|
add hl, bc
|
|
res SOUND_CHANNEL_ON, [hl]
|
|
; note = rest
|
|
ld hl, Channel1NoteFlags - Channel1
|
|
add hl, bc
|
|
set NOTE_REST, [hl]
|
|
; clear music id & bank
|
|
ld hl, Channel1MusicID - Channel1
|
|
add hl, bc
|
|
xor a
|
|
ld [hli], a ; id hi
|
|
ld [hli], a ; id lo
|
|
ld [hli], a ; bank
|
|
ret
|
|
|
|
; e8679
|
|
|
|
RestoreVolume: ; e8679
|
|
; ch5 only
|
|
ld a, [CurChannel]
|
|
cp $4
|
|
ret nz
|
|
xor a
|
|
ld hl, Channel6CryPitch
|
|
ld [hli], a
|
|
ld [hl], a
|
|
ld hl, Channel8CryPitch
|
|
ld [hli], a
|
|
ld [hl], a
|
|
ld a, [LastVolume]
|
|
ld [Volume], a
|
|
xor a
|
|
ld [LastVolume], a
|
|
ld [SFXPriority], a
|
|
ret
|
|
|
|
; e8698
|
|
|
|
Functione8698: ; e8698
|
|
; turn noise sampling on
|
|
ld hl, Channel1NoteFlags - Channel1
|
|
add hl, bc
|
|
set NOTE_UNKN_4, [hl] ; noise sample
|
|
; update note duration
|
|
ld a, [CurMusicByte]
|
|
call SetNoteDuration ; top nybble doesnt matter?
|
|
; update intensity from next param
|
|
call GetMusicByte
|
|
ld hl, Channel1Intensity - Channel1
|
|
add hl, bc
|
|
ld [hl], a
|
|
; update lo frequency from next param
|
|
call GetMusicByte
|
|
ld hl, Channel1FrequencyLo - Channel1
|
|
add hl, bc
|
|
ld [hl], a
|
|
; are we on the last channel? (noise sampling)
|
|
ld a, [CurChannel]
|
|
and $3
|
|
cp $3
|
|
ret z
|
|
; update hi frequency from next param
|
|
call GetMusicByte
|
|
ld hl, Channel1FrequencyHi - Channel1
|
|
add hl, bc
|
|
ld [hl], a
|
|
ret
|
|
|
|
; e86c5
|
|
|
|
GetNoiseSample: ; e86c5
|
|
; load ptr to sample header in NoiseSampleAddress
|
|
; are we on the last channel?
|
|
ld a, [CurChannel]
|
|
and $3
|
|
cp $3
|
|
; ret if not
|
|
ret nz
|
|
; update note duration
|
|
ld a, [CurMusicByte]
|
|
and $f
|
|
call SetNoteDuration
|
|
; check current channel
|
|
ld a, [CurChannel]
|
|
bit 2, a ; are we in a sfx channel?
|
|
jr nz, .sfx
|
|
ld hl, Channel8Flags
|
|
bit SOUND_CHANNEL_ON, [hl] ; is ch8 on? (noise)
|
|
ret nz
|
|
ld a, [MusicNoiseSampleSet]
|
|
jr .next
|
|
|
|
.sfx
|
|
ld a, [SFXNoiseSampleSet]
|
|
.next
|
|
; load noise sample set id into de
|
|
ld e, a
|
|
ld d, 0
|
|
; load ptr to noise sample set in hl
|
|
ld hl, Drumkits
|
|
rept 2
|
|
add hl, de
|
|
endr
|
|
ld a, [hli]
|
|
ld h, [hl]
|
|
ld l, a
|
|
; get pitch
|
|
ld a, [CurMusicByte]
|
|
swap a
|
|
; non-rest note?
|
|
and $f
|
|
ret z
|
|
; use 'pitch' to seek noise sample set
|
|
ld e, a
|
|
ld d, 0
|
|
rept 2
|
|
add hl, de
|
|
endr
|
|
; load sample pointer into NoiseSampleAddress
|
|
ld a, [hli]
|
|
ld [NoiseSampleAddressLo], a
|
|
ld a, [hl]
|
|
ld [NoiseSampleAddressHi], a
|
|
; clear ????
|
|
xor a
|
|
ld [wNoiseSampleDelay], a
|
|
ret
|
|
|
|
; e870f
|
|
|
|
ParseMusicCommand: ; e870f
|
|
; reload command
|
|
ld a, [CurMusicByte]
|
|
; get command #
|
|
sub a, $d0 ; first command
|
|
ld e, a
|
|
ld d, 0
|
|
; seek command pointer
|
|
ld hl, MusicCommands
|
|
rept 2
|
|
add hl, de
|
|
endr
|
|
; jump to the new pointer
|
|
ld a, [hli]
|
|
ld h, [hl]
|
|
ld l, a
|
|
jp [hl]
|
|
|
|
; e8720
|
|
|
|
MusicCommands: ; e8720
|
|
; pointer to each command in order
|
|
; octaves
|
|
dw Music_Octave8 ; octave 8
|
|
dw Music_Octave7 ; octave 7
|
|
dw Music_Octave6 ; octave 6
|
|
dw Music_Octave5 ; octave 5
|
|
dw Music_Octave4 ; octave 4
|
|
dw Music_Octave3 ; octave 3
|
|
dw Music_Octave2 ; octave 2
|
|
dw Music_Octave1 ; octave 1
|
|
dw Music_NoteType ; note length + intensity
|
|
dw Music_ForceOctave ; set starting octave
|
|
dw Music_Tempo ; tempo
|
|
dw Music_DutyCycle ; duty cycle
|
|
dw Music_Intensity ; intensity
|
|
dw Music_SoundStatus ; update sound status
|
|
dw MusicDE ; ???? + duty cycle
|
|
dw Music_ToggleSFX ;
|
|
dw MusicE0 ;
|
|
dw Music_Vibrato ; vibrato
|
|
dw MusicE2 ; unused
|
|
dw Music_ToggleNoise ; music noise sampling
|
|
dw Music_Panning ; force panning
|
|
dw Music_Volume ; volume
|
|
dw Music_Tone ; tone
|
|
dw MusicE7 ; unused
|
|
dw MusicE8 ; unused
|
|
dw Music_TempoRelative ; global tempo
|
|
dw Music_RestartChannel ; restart current channel from header
|
|
dw Music_NewSong ; new song
|
|
dw Music_SFXPriorityOn ; sfx priority on
|
|
dw Music_SFXPriorityOff ; sfx priority off
|
|
dw MusicEE ; unused
|
|
dw Music_StereoPanning ; stereo panning
|
|
dw Music_SFXToggleNoise ; sfx noise sampling
|
|
dw MusicF1 ; nothing
|
|
dw MusicF2 ; nothing
|
|
dw MusicF3 ; nothing
|
|
dw MusicF4 ; nothing
|
|
dw MusicF5 ; nothing
|
|
dw MusicF6 ; nothing
|
|
dw MusicF7 ; nothing
|
|
dw MusicF8 ; nothing
|
|
dw MusicF9 ; unused
|
|
dw Music_SetCondition ;
|
|
dw Music_JumpIf ;
|
|
dw Music_JumpChannel ; jump
|
|
dw Music_LoopChannel ; loop
|
|
dw Music_CallChannel ; call
|
|
dw Music_EndChannel ; return
|
|
; e8780
|
|
|
|
MusicF1: ; e8780
|
|
MusicF2: ; e8780
|
|
MusicF3: ; e8780
|
|
MusicF4: ; e8780
|
|
MusicF5: ; e8780
|
|
MusicF6: ; e8780
|
|
MusicF7: ; e8780
|
|
MusicF8: ; e8780
|
|
ret
|
|
|
|
; e8781
|
|
|
|
Music_EndChannel: ; e8781
|
|
; called when $ff is encountered w/ subroutine flag set
|
|
; end music stream
|
|
; return to caller of the subroutine
|
|
; reset subroutine flag
|
|
ld hl, Channel1Flags - Channel1
|
|
add hl, bc
|
|
res SOUND_SUBROUTINE, [hl]
|
|
; copy LastMusicAddress to MusicAddress
|
|
ld hl, Channel1LastMusicAddress - Channel1
|
|
add hl, bc
|
|
ld e, [hl]
|
|
inc hl
|
|
ld d, [hl]
|
|
ld hl, Channel1MusicAddress - Channel1
|
|
add hl, bc
|
|
ld [hl], e
|
|
inc hl
|
|
ld [hl], d
|
|
ret
|
|
|
|
; e8796
|
|
|
|
Music_CallChannel: ; e8796
|
|
; call music stream (subroutine)
|
|
; parameters: ll hh ; pointer to subroutine
|
|
; get pointer from next 2 bytes
|
|
call GetMusicByte
|
|
ld e, a
|
|
call GetMusicByte
|
|
ld d, a
|
|
push de
|
|
; copy MusicAddress to LastMusicAddress
|
|
ld hl, Channel1MusicAddress - Channel1
|
|
add hl, bc
|
|
ld e, [hl]
|
|
inc hl
|
|
ld d, [hl]
|
|
ld hl, Channel1LastMusicAddress - Channel1
|
|
add hl, bc
|
|
ld [hl], e
|
|
inc hl
|
|
ld [hl], d
|
|
; load pointer into MusicAddress
|
|
pop de
|
|
ld hl, Channel1MusicAddress - Channel1
|
|
add hl, bc
|
|
ld [hl], e
|
|
inc hl
|
|
ld [hl], d
|
|
; set subroutine flag
|
|
ld hl, Channel1Flags - Channel1
|
|
add hl, bc
|
|
set SOUND_SUBROUTINE, [hl]
|
|
ret
|
|
|
|
; e87bc
|
|
|
|
Music_JumpChannel: ; e87bc
|
|
; jump
|
|
; parameters: ll hh ; pointer
|
|
; get pointer from next 2 bytes
|
|
call GetMusicByte
|
|
ld e, a
|
|
call GetMusicByte
|
|
ld d, a
|
|
ld hl, Channel1MusicAddress - Channel1
|
|
add hl, bc
|
|
ld [hl], e
|
|
inc hl
|
|
ld [hl], d
|
|
ret
|
|
|
|
; e87cc
|
|
|
|
Music_LoopChannel: ; e87cc
|
|
; loops xx - 1 times
|
|
; 00: infinite
|
|
; params: 3
|
|
; xx ll hh
|
|
; xx : loop count
|
|
; ll hh : pointer
|
|
|
|
; get loop count
|
|
call GetMusicByte
|
|
ld hl, Channel1Flags - Channel1
|
|
add hl, bc
|
|
bit SOUND_LOOPING, [hl] ; has the loop been initiated?
|
|
jr nz, .checkloop
|
|
and a ; loop counter 0 = infinite
|
|
jr z, .loop
|
|
; initiate loop
|
|
dec a
|
|
set SOUND_LOOPING, [hl] ; set loop flag
|
|
ld hl, Channel1LoopCount - Channel1
|
|
add hl, bc
|
|
ld [hl], a ; store loop counter
|
|
.checkloop
|
|
ld hl, Channel1LoopCount - Channel1
|
|
add hl, bc
|
|
ld a, [hl]
|
|
and a ; are we done?
|
|
jr z, .endloop
|
|
dec [hl]
|
|
.loop
|
|
; get pointer
|
|
call GetMusicByte
|
|
ld e, a
|
|
call GetMusicByte
|
|
ld d, a
|
|
; load new pointer into MusicAddress
|
|
ld hl, Channel1MusicAddress - Channel1
|
|
add hl, bc
|
|
ld [hl], e
|
|
inc hl
|
|
ld [hl], d
|
|
ret
|
|
|
|
.endloop
|
|
; reset loop flag
|
|
ld hl, Channel1Flags - Channel1
|
|
add hl, bc
|
|
res SOUND_LOOPING, [hl]
|
|
; skip to next command
|
|
ld hl, Channel1MusicAddress - Channel1
|
|
add hl, bc
|
|
ld e, [hl]
|
|
inc hl
|
|
ld d, [hl]
|
|
inc de ; skip
|
|
inc de ; pointer
|
|
ld [hl], d
|
|
dec hl
|
|
ld [hl], e
|
|
ret
|
|
|
|
; e880e
|
|
|
|
Music_SetCondition: ; e880e
|
|
; set condition for a jump
|
|
; used with FB
|
|
; params: 1
|
|
; xx ; condition
|
|
|
|
; set condition
|
|
call GetMusicByte
|
|
ld hl, Channel1Condition - Channel1
|
|
add hl, bc
|
|
ld [hl], a
|
|
ret
|
|
|
|
; e8817
|
|
|
|
Music_JumpIf: ; e8817
|
|
; conditional jump
|
|
; used with FA
|
|
; params: 3
|
|
; xx: condition
|
|
; ll hh: pointer
|
|
|
|
; check condition
|
|
; a = condition
|
|
call GetMusicByte
|
|
; if existing condition matches, jump to new address
|
|
ld hl, Channel1Condition - Channel1
|
|
add hl, bc
|
|
cp [hl]
|
|
jr z, .jump
|
|
; skip to next command
|
|
; get address
|
|
ld hl, Channel1MusicAddress - Channel1
|
|
add hl, bc
|
|
ld e, [hl]
|
|
inc hl
|
|
ld d, [hl]
|
|
; skip pointer
|
|
rept 2
|
|
inc de
|
|
endr
|
|
; update address
|
|
ld [hl], d
|
|
dec hl
|
|
ld [hl], e
|
|
ret
|
|
|
|
.jump
|
|
; jump to the new address
|
|
; get pointer
|
|
call GetMusicByte
|
|
ld e, a
|
|
call GetMusicByte
|
|
ld d, a
|
|
; update pointer in MusicAddress
|
|
ld hl, Channel1MusicAddress - Channel1
|
|
add hl, bc
|
|
ld [hl], e
|
|
inc hl
|
|
ld [hl], d
|
|
ret
|
|
|
|
; e883e
|
|
|
|
MusicEE; e883e
|
|
; conditional jump
|
|
; checks a byte in ram corresponding to the current channel
|
|
; doesn't seem to be set by any commands
|
|
; params: 2
|
|
; ll hh ; pointer
|
|
|
|
; if ????, jump
|
|
; get channel
|
|
ld a, [CurChannel]
|
|
and $3 ; ch0-3
|
|
ld e, a
|
|
ld d, 0
|
|
; hl = Channel1JumpCondition + channel id
|
|
ld hl, Channel1JumpCondition
|
|
add hl, de
|
|
; if set, jump
|
|
ld a, [hl]
|
|
and a
|
|
jr nz, .jump
|
|
; skip to next command
|
|
; get address
|
|
ld hl, Channel1MusicAddress - Channel1
|
|
add hl, bc
|
|
ld e, [hl]
|
|
inc hl
|
|
ld d, [hl]
|
|
; skip pointer
|
|
rept 2
|
|
inc de
|
|
endr
|
|
; update address
|
|
ld [hl], d
|
|
dec hl
|
|
ld [hl], e
|
|
ret
|
|
|
|
.jump
|
|
; reset jump flag
|
|
ld [hl], 0
|
|
; de = pointer
|
|
call GetMusicByte
|
|
ld e, a
|
|
call GetMusicByte
|
|
ld d, a
|
|
; update address
|
|
ld hl, Channel1MusicAddress - Channel1
|
|
add hl, bc
|
|
ld [hl], e
|
|
inc hl
|
|
ld [hl], d
|
|
ret
|
|
|
|
; e886d
|
|
|
|
MusicF9: ; e886d
|
|
; sets some flag
|
|
; seems to be unused
|
|
; params: 0
|
|
ld a, 1
|
|
ld [wc2b5], a
|
|
ret
|
|
|
|
; e8873
|
|
|
|
MusicE2: ; e8873
|
|
; seems to have been dummied out
|
|
; params: 1
|
|
call GetMusicByte
|
|
ld hl, Channel1Field0x2c - Channel1
|
|
add hl, bc
|
|
ld [hl], a
|
|
ld hl, Channel1Flags2 - Channel1
|
|
add hl, bc
|
|
set SOUND_UNKN_0B, [hl]
|
|
ret
|
|
|
|
; e8882
|
|
|
|
Music_Vibrato: ; e8882
|
|
; vibrato
|
|
; params: 2
|
|
; 1: [xx]
|
|
; delay in frames
|
|
; 2: [yz]
|
|
; y: extent
|
|
; z: rate (# frames per cycle)
|
|
|
|
; set vibrato flag?
|
|
ld hl, Channel1Flags2 - Channel1
|
|
add hl, bc
|
|
set SOUND_VIBRATO, [hl]
|
|
; start at lower frequency (extent is positive)
|
|
ld hl, Channel1Flags3 - Channel1
|
|
add hl, bc
|
|
res SOUND_VIBRATO_DIR, [hl]
|
|
; get delay
|
|
call GetMusicByte
|
|
; update delay
|
|
ld hl, Channel1VibratoDelay - Channel1
|
|
add hl, bc
|
|
ld [hl], a
|
|
; update delay count
|
|
ld hl, Channel1VibratoDelayCount - Channel1
|
|
add hl, bc
|
|
ld [hl], a
|
|
; update extent
|
|
; this is split into halves only to get added back together at the last second
|
|
; get extent/rate
|
|
call GetMusicByte
|
|
ld hl, Channel1VibratoExtent - Channel1
|
|
add hl, bc
|
|
ld d, a
|
|
; get top nybble
|
|
and $f0
|
|
swap a
|
|
srl a ; halve
|
|
ld e, a
|
|
adc a, 0; round up
|
|
swap a
|
|
or e
|
|
ld [hl], a
|
|
; update rate
|
|
ld hl, Channel1VibratoRate - Channel1
|
|
add hl, bc
|
|
; get bottom nybble
|
|
ld a, d
|
|
and $f
|
|
ld d, a
|
|
swap a
|
|
or d
|
|
ld [hl], a
|
|
ret
|
|
|
|
; e88bd
|
|
|
|
MusicE0: ; e88bd
|
|
; ????
|
|
; params: 2
|
|
call GetMusicByte
|
|
ld [wc297], a
|
|
|
|
call GetMusicByte
|
|
ld d, a
|
|
and $f
|
|
ld e, a
|
|
|
|
ld a, d
|
|
swap a
|
|
and $f
|
|
ld d, a
|
|
call GetFrequency
|
|
ld hl, Channel1Field0x21 - Channel1
|
|
add hl, bc
|
|
ld [hl], e
|
|
ld hl, Channel1Field0x22 - Channel1
|
|
add hl, bc
|
|
ld [hl], d
|
|
ld hl, Channel1Flags2 - Channel1
|
|
add hl, bc
|
|
set SOUND_UNKN_09, [hl]
|
|
ret
|
|
|
|
; e88e4
|
|
|
|
Music_Tone: ; e88e4
|
|
; tone
|
|
; params: 2
|
|
ld hl, Channel1Flags2 - Channel1
|
|
add hl, bc
|
|
set SOUND_CRY_PITCH, [hl]
|
|
ld hl, Channel1CryPitch + 1 - Channel1
|
|
add hl, bc
|
|
call GetMusicByte
|
|
ld [hld], a
|
|
call GetMusicByte
|
|
ld [hl], a
|
|
ret
|
|
|
|
; e88f7
|
|
|
|
MusicE7: ; e88f7
|
|
; unused
|
|
; params: 1
|
|
ld hl, Channel1Flags2 - Channel1
|
|
add hl, bc
|
|
set SOUND_UNKN_0E, [hl]
|
|
call GetMusicByte
|
|
ld hl, Channel1Field0x29 - Channel1
|
|
add hl, bc
|
|
ld [hl], a
|
|
ret
|
|
|
|
; e8906
|
|
|
|
MusicDE: ; e8906
|
|
; ???? + duty cycle
|
|
; params: 1
|
|
;
|
|
ld hl, Channel1Flags2 - Channel1
|
|
add hl, bc
|
|
set SOUND_DUTY, [hl] ; duty cycle
|
|
;
|
|
call GetMusicByte
|
|
rrca
|
|
rrca
|
|
ld hl, Channel1Field0x1c - Channel1
|
|
add hl, bc
|
|
ld [hl], a
|
|
; update duty cycle
|
|
and $c0 ; only uses top 2 bits
|
|
ld hl, Channel1DutyCycle - Channel1
|
|
add hl, bc
|
|
ld [hl], a
|
|
ret
|
|
|
|
; e891e
|
|
|
|
MusicE8: ; e891e
|
|
; unused
|
|
; params: 1
|
|
ld hl, Channel1Flags2 - Channel1
|
|
add hl, bc
|
|
set SOUND_UNKN_0D, [hl]
|
|
call GetMusicByte
|
|
ld hl, Channel1Field0x2a - Channel1
|
|
add hl, bc
|
|
ld [hl], a
|
|
ret
|
|
|
|
; e892d
|
|
|
|
Music_ToggleSFX: ; e892d
|
|
; toggle something
|
|
; params: none
|
|
ld hl, Channel1Flags - Channel1
|
|
add hl, bc
|
|
bit SOUND_SFX, [hl]
|
|
jr z, .on
|
|
res SOUND_SFX, [hl]
|
|
ret
|
|
|
|
.on
|
|
set SOUND_SFX, [hl]
|
|
ret
|
|
|
|
; e893b
|
|
|
|
Music_ToggleNoise: ; e893b
|
|
; toggle music noise sampling
|
|
; can't be used as a straight toggle since the param is not read from on->off
|
|
; params:
|
|
; noise on: 1
|
|
; noise off: 0
|
|
; check if noise sampling is on
|
|
ld hl, Channel1Flags - Channel1
|
|
add hl, bc
|
|
bit SOUND_NOISE, [hl]
|
|
jr z, .on
|
|
; turn noise sampling off
|
|
res SOUND_NOISE, [hl]
|
|
ret
|
|
|
|
.on
|
|
; turn noise sampling on
|
|
set SOUND_NOISE, [hl]
|
|
call GetMusicByte
|
|
ld [MusicNoiseSampleSet], a
|
|
ret
|
|
|
|
; e894f
|
|
|
|
Music_SFXToggleNoise: ; e894f
|
|
; toggle sfx noise sampling
|
|
; params:
|
|
; on: 1
|
|
; off: 0
|
|
; check if noise sampling is on
|
|
ld hl, Channel1Flags - Channel1
|
|
add hl, bc
|
|
bit SOUND_NOISE, [hl]
|
|
jr z, .on
|
|
; turn noise sampling off
|
|
res SOUND_NOISE, [hl]
|
|
ret
|
|
|
|
.on
|
|
; turn noise sampling on
|
|
set SOUND_NOISE, [hl]
|
|
call GetMusicByte
|
|
ld [SFXNoiseSampleSet], a
|
|
ret
|
|
|
|
; e8963
|
|
|
|
Music_NoteType: ; e8963
|
|
; note length
|
|
; # frames per 16th note
|
|
; intensity: see Music_Intensity
|
|
; params: 2
|
|
; note length
|
|
call GetMusicByte
|
|
ld hl, Channel1NoteLength - Channel1
|
|
add hl, bc
|
|
ld [hl], a
|
|
ld a, [CurChannel]
|
|
and $3
|
|
cp CHAN4 ; CHAN8 & $3
|
|
ret z
|
|
; intensity
|
|
call Music_Intensity
|
|
ret
|
|
|
|
; e8977
|
|
|
|
Music_SoundStatus: ; e8977
|
|
; update sound status
|
|
; params: 1
|
|
call GetMusicByte
|
|
ld [SoundInput], a
|
|
ld hl, Channel1NoteFlags - Channel1
|
|
add hl, bc
|
|
set NOTE_UNKN_3, [hl]
|
|
ret
|
|
|
|
; e8984
|
|
|
|
Music_DutyCycle: ; e8984
|
|
; duty cycle
|
|
; params: 1
|
|
call GetMusicByte
|
|
rrca
|
|
rrca
|
|
and $c0
|
|
ld hl, Channel1DutyCycle - Channel1
|
|
add hl, bc
|
|
ld [hl], a
|
|
ret
|
|
|
|
; e8991
|
|
|
|
Music_Intensity: ; e8991
|
|
; intensity
|
|
; params: 1
|
|
; hi: pressure
|
|
; lo: velocity
|
|
call GetMusicByte
|
|
ld hl, Channel1Intensity - Channel1
|
|
add hl, bc
|
|
ld [hl], a
|
|
ret
|
|
|
|
; e899a
|
|
|
|
Music_Tempo: ; e899a
|
|
; global tempo
|
|
; params: 2
|
|
; de: tempo
|
|
call GetMusicByte
|
|
ld d, a
|
|
call GetMusicByte
|
|
ld e, a
|
|
call SetGlobalTempo
|
|
ret
|
|
|
|
; e89a6
|
|
|
|
Music_Octave8: ; e89a6
|
|
Music_Octave7: ; e89a6
|
|
Music_Octave6: ; e89a6
|
|
Music_Octave5: ; e89a6
|
|
Music_Octave4: ; e89a6
|
|
Music_Octave3: ; e89a6
|
|
Music_Octave2: ; e89a6
|
|
Music_Octave1: ; e89a6
|
|
; set octave based on lo nybble of the command
|
|
ld hl, Channel1Octave - Channel1
|
|
add hl, bc
|
|
ld a, [CurMusicByte]
|
|
and 7
|
|
ld [hl], a
|
|
ret
|
|
|
|
; e89b1
|
|
|
|
Music_ForceOctave: ; e89b1
|
|
; set starting octave
|
|
; this forces all notes up by the starting octave
|
|
; params: 1
|
|
call GetMusicByte
|
|
ld hl, Channel1StartingOctave - Channel1
|
|
add hl, bc
|
|
ld [hl], a
|
|
ret
|
|
|
|
; e89ba
|
|
|
|
Music_StereoPanning: ; e89ba
|
|
; stereo panning
|
|
; params: 1
|
|
; stereo on?
|
|
ld a, [Options]
|
|
bit 5, a ; stereo
|
|
jr nz, Music_Panning
|
|
; skip param
|
|
call GetMusicByte
|
|
ret
|
|
|
|
; e89c5
|
|
|
|
Music_Panning: ; e89c5
|
|
; force panning
|
|
; params: 1
|
|
call SetLRTracks
|
|
call GetMusicByte
|
|
ld hl, Channel1Tracks - Channel1
|
|
add hl, bc
|
|
and [hl]
|
|
ld [hl], a
|
|
ret
|
|
|
|
; e89d2
|
|
|
|
Music_Volume: ; e89d2
|
|
; set volume
|
|
; params: 1
|
|
; see Volume
|
|
; read param even if it's not used
|
|
call GetMusicByte
|
|
; is the song fading?
|
|
ld a, [MusicFade]
|
|
and a
|
|
ret nz
|
|
; reload param
|
|
ld a, [CurMusicByte]
|
|
; set volume
|
|
ld [Volume], a
|
|
ret
|
|
|
|
; e89e1
|
|
|
|
Music_TempoRelative: ; e89e1
|
|
; set global tempo to current channel tempo +- param
|
|
; params: 1 signed
|
|
call GetMusicByte
|
|
ld e, a
|
|
; check sign
|
|
cp $80
|
|
jr nc, .negative
|
|
;positive
|
|
ld d, 0
|
|
jr .ok
|
|
|
|
.negative
|
|
ld d, -1
|
|
.ok
|
|
ld hl, Channel1Tempo - Channel1
|
|
add hl, bc
|
|
ld a, [hli]
|
|
ld h, [hl]
|
|
ld l, a
|
|
add hl, de
|
|
ld e, l
|
|
ld d, h
|
|
call SetGlobalTempo
|
|
ret
|
|
|
|
; e89fd
|
|
|
|
Music_SFXPriorityOn: ; e89fd
|
|
; turn sfx priority on
|
|
; params: none
|
|
ld a, 1
|
|
ld [SFXPriority], a
|
|
ret
|
|
|
|
; e8a03
|
|
|
|
Music_SFXPriorityOff: ; e8a03
|
|
; turn sfx priority off
|
|
; params: none
|
|
xor a
|
|
ld [SFXPriority], a
|
|
ret
|
|
|
|
; e8a08
|
|
|
|
Music_RestartChannel: ; e8a08
|
|
; restart current channel from channel header (same bank)
|
|
; params: 2 (5)
|
|
; ll hh: pointer to new channel header
|
|
; header format: 0x yy zz
|
|
; x: channel # (0-3)
|
|
; zzyy: pointer to new music data
|
|
|
|
; update music id
|
|
ld hl, Channel1MusicID - Channel1
|
|
add hl, bc
|
|
ld a, [hli]
|
|
ld [MusicIDLo], a
|
|
ld a, [hl]
|
|
ld [MusicIDHi], a
|
|
; update music bank
|
|
ld hl, Channel1MusicBank - Channel1
|
|
add hl, bc
|
|
ld a, [hl]
|
|
ld [MusicBank], a
|
|
; get pointer to new channel header
|
|
call GetMusicByte
|
|
ld l, a
|
|
call GetMusicByte
|
|
ld h, a
|
|
ld e, [hl]
|
|
inc hl
|
|
ld d, [hl]
|
|
push bc ; save current channel
|
|
call LoadChannel
|
|
call StartChannel
|
|
pop bc ; restore current channel
|
|
ret
|
|
|
|
; e8a30
|
|
|
|
Music_NewSong: ; e8a30
|
|
; new song
|
|
; params: 2
|
|
; de: song id
|
|
call GetMusicByte
|
|
ld e, a
|
|
call GetMusicByte
|
|
ld d, a
|
|
push bc
|
|
call _PlayMusic
|
|
pop bc
|
|
ret
|
|
|
|
; e8a3e
|
|
|
|
GetMusicByte: ; e8a3e
|
|
; returns byte from current address in a
|
|
; advances to next byte in music data
|
|
; input: bc = start of current channel
|
|
push hl
|
|
push de
|
|
; load address into de
|
|
ld hl, Channel1MusicAddress - Channel1
|
|
add hl, bc
|
|
ld a, [hli]
|
|
ld e, a
|
|
ld d, [hl]
|
|
; load bank into a
|
|
ld hl, Channel1MusicBank - Channel1
|
|
add hl, bc
|
|
ld a, [hl]
|
|
; get byte
|
|
call _LoadMusicByte ; load data into CurMusicByte
|
|
inc de ; advance to next byte for next time this is called
|
|
; update channeldata address
|
|
ld hl, Channel1MusicAddress - Channel1
|
|
add hl, bc
|
|
ld a, e
|
|
ld [hli], a
|
|
ld [hl], d
|
|
; cleanup
|
|
pop de
|
|
pop hl
|
|
; store channeldata in a
|
|
ld a, [CurMusicByte]
|
|
ret
|
|
|
|
; e8a5d
|
|
|
|
GetFrequency: ; e8a5d
|
|
; generate frequency
|
|
; input:
|
|
; d: octave
|
|
; e: pitch
|
|
; output:
|
|
; de: frequency
|
|
|
|
; get octave
|
|
; get starting octave
|
|
ld hl, Channel1StartingOctave - Channel1
|
|
add hl, bc
|
|
ld a, [hl]
|
|
swap a ; hi nybble
|
|
and $f
|
|
; add current octave
|
|
add d
|
|
push af ; we'll use this later
|
|
; get starting octave
|
|
ld hl, Channel1StartingOctave - Channel1
|
|
add hl, bc
|
|
ld a, [hl]
|
|
and $f ; lo nybble
|
|
ld l, a ; ok
|
|
ld d, 0
|
|
ld h, d
|
|
add hl, de ; add current pitch
|
|
add hl, hl ; skip 2 bytes for each
|
|
ld de, FrequencyTable
|
|
add hl, de
|
|
ld e, [hl]
|
|
inc hl
|
|
ld d, [hl]
|
|
; get our octave
|
|
pop af
|
|
; shift right by [7 - octave] bits
|
|
.loop
|
|
; [7 - octave] loops
|
|
cp $7
|
|
jr nc, .ok
|
|
; sra de
|
|
sra d
|
|
rr e
|
|
inc a
|
|
jr .loop
|
|
|
|
.ok
|
|
ld a, d
|
|
and $7 ; top 3 bits for frequency (11 total)
|
|
ld d, a
|
|
ret
|
|
|
|
; e8a8d
|
|
|
|
SetNoteDuration: ; e8a8d
|
|
; input: a = note duration in 16ths
|
|
; store delay units in de
|
|
inc a
|
|
ld e, a
|
|
ld d, 0
|
|
; store NoteLength in a
|
|
ld hl, Channel1NoteLength - Channel1
|
|
add hl, bc
|
|
ld a, [hl]
|
|
; multiply NoteLength by delay units
|
|
ld l, 0; just multiply
|
|
call .Multiply
|
|
ld a, l ; % $100
|
|
; store Tempo in de
|
|
ld hl, Channel1Tempo - Channel1
|
|
add hl, bc
|
|
ld e, [hl]
|
|
inc hl
|
|
ld d, [hl]
|
|
; add ???? to the next result
|
|
ld hl, Channel1Field0x16 - Channel1
|
|
add hl, bc
|
|
ld l, [hl]
|
|
; multiply Tempo by last result (NoteLength * delay % $100)
|
|
call .Multiply
|
|
; copy result to de
|
|
ld e, l
|
|
ld d, h
|
|
; store result in ????
|
|
ld hl, Channel1Field0x16 - Channel1
|
|
add hl, bc
|
|
ld [hl], e
|
|
; store result in NoteDuration
|
|
ld hl, Channel1NoteDuration - Channel1
|
|
add hl, bc
|
|
ld [hl], d
|
|
ret
|
|
|
|
; e8ab8
|
|
|
|
.Multiply: ; e8ab8
|
|
; multiplies a and de
|
|
; adds the result to l
|
|
; stores the result in hl
|
|
ld h, 0
|
|
.loop
|
|
; halve a
|
|
srl a
|
|
; is there a remainder?
|
|
jr nc, .skip
|
|
; add it to the result
|
|
add hl, de
|
|
.skip
|
|
; add de, de
|
|
sla e
|
|
rl d
|
|
; are we done?
|
|
and a
|
|
jr nz, .loop
|
|
ret
|
|
|
|
; e8ac7
|
|
|
|
SetGlobalTempo: ; e8ac7
|
|
push bc ; save current channel
|
|
; are we dealing with music or sfx?
|
|
ld a, [CurChannel]
|
|
cp CHAN5
|
|
jr nc, .sfxchannels
|
|
ld bc, Channel1
|
|
call Tempo
|
|
ld bc, Channel2
|
|
call Tempo
|
|
ld bc, Channel3
|
|
call Tempo
|
|
ld bc, Channel4
|
|
call Tempo
|
|
jr .end
|
|
|
|
.sfxchannels
|
|
ld bc, Channel5
|
|
call Tempo
|
|
ld bc, Channel6
|
|
call Tempo
|
|
ld bc, Channel7
|
|
call Tempo
|
|
ld bc, Channel8
|
|
call Tempo
|
|
.end
|
|
pop bc ; restore current channel
|
|
ret
|
|
|
|
; e8b03
|
|
|
|
Tempo: ; e8b03
|
|
; input:
|
|
; de: note length
|
|
; update Tempo
|
|
ld hl, Channel1Tempo - Channel1
|
|
add hl, bc
|
|
ld [hl], e
|
|
inc hl
|
|
ld [hl], d
|
|
; clear ????
|
|
xor a
|
|
ld hl, Channel1Field0x16 - Channel1
|
|
add hl, bc
|
|
ld [hl], a
|
|
ret
|
|
|
|
; e8b11
|
|
|
|
StartChannel: ; e8b11
|
|
call SetLRTracks
|
|
ld hl, Channel1Flags - Channel1
|
|
add hl, bc
|
|
set SOUND_CHANNEL_ON, [hl] ; turn channel on
|
|
ret
|
|
|
|
; e8b1b
|
|
|
|
SetLRTracks: ; e8b1b
|
|
; set tracks for a the current channel to default
|
|
; seems to be redundant since this is overwritten by stereo data later
|
|
push de
|
|
; store current channel in de
|
|
ld a, [CurChannel]
|
|
and $3
|
|
ld e, a
|
|
ld d, 0
|
|
; get this channel's lr tracks
|
|
call GetLRTracks
|
|
add hl, de ; de = channel 0-3
|
|
ld a, [hl]
|
|
; load lr tracks into Tracks
|
|
ld hl, Channel1Tracks - Channel1
|
|
add hl, bc
|
|
ld [hl], a
|
|
pop de
|
|
ret
|
|
|
|
; e8b30
|
|
|
|
_PlayMusic:: ; e8b30
|
|
; load music
|
|
call MusicOff
|
|
ld hl, MusicID
|
|
ld [hl], e ; song number
|
|
inc hl
|
|
ld [hl], d ; MusicIDHi (always $)
|
|
ld hl, Music
|
|
add hl, de ; three
|
|
add hl, de ; byte
|
|
add hl, de ; pointer
|
|
ld a, [hli]
|
|
ld [MusicBank], a
|
|
ld e, [hl]
|
|
inc hl
|
|
ld d, [hl] ; music header address
|
|
call LoadMusicByte ; store first byte of music header in a
|
|
rlca
|
|
rlca
|
|
and $3 ; get number of channels
|
|
inc a
|
|
.loop
|
|
; start playing channels
|
|
push af
|
|
call LoadChannel
|
|
call StartChannel
|
|
pop af
|
|
dec a
|
|
jr nz, .loop
|
|
xor a
|
|
ld [wc2b5], a
|
|
ld [Channel1JumpCondition], a
|
|
ld [Channel2JumpCondition], a
|
|
ld [Channel3JumpCondition], a
|
|
ld [Channel4JumpCondition], a
|
|
ld [NoiseSampleAddressLo], a
|
|
ld [NoiseSampleAddressHi], a
|
|
ld [wNoiseSampleDelay], a
|
|
ld [MusicNoiseSampleSet], a
|
|
call MusicOn
|
|
ret
|
|
|
|
; e8b79
|
|
|
|
_PlayCryHeader:: ; e8b79
|
|
; Play cry de using parameters:
|
|
; CryPitch
|
|
; CryLength
|
|
|
|
call MusicOff
|
|
|
|
; Overload the music id with the cry id
|
|
ld hl, MusicID
|
|
ld [hl], e
|
|
inc hl
|
|
ld [hl], d
|
|
|
|
; 3-byte pointers (bank, address)
|
|
ld hl, Cries
|
|
rept 3
|
|
add hl, de
|
|
endr
|
|
|
|
ld a, [hli]
|
|
ld [MusicBank], a
|
|
|
|
ld e, [hl]
|
|
inc hl
|
|
ld d, [hl]
|
|
|
|
; Read the cry's sound header
|
|
call LoadMusicByte
|
|
; Top 2 bits contain the number of channels
|
|
rlca
|
|
rlca
|
|
and 3
|
|
|
|
; For each channel:
|
|
inc a
|
|
.loop
|
|
push af
|
|
call LoadChannel
|
|
|
|
ld hl, Channel1Flags - Channel1
|
|
add hl, bc
|
|
set SOUND_REST, [hl]
|
|
|
|
ld hl, Channel1Flags2 - Channel1
|
|
add hl, bc
|
|
set SOUND_CRY_PITCH, [hl]
|
|
|
|
ld hl, Channel1CryPitch - Channel1
|
|
add hl, bc
|
|
ld a, [CryPitch]
|
|
ld [hli], a
|
|
ld a, [CryPitch + 1]
|
|
ld [hl], a
|
|
|
|
; No tempo for channel 4
|
|
ld a, [CurChannel]
|
|
and 3
|
|
cp 3
|
|
jr nc, .start
|
|
|
|
; Tempo is effectively length
|
|
ld hl, Channel1Tempo - Channel1
|
|
add hl, bc
|
|
ld a, [CryLength]
|
|
ld [hli], a
|
|
ld a, [CryLength+1]
|
|
ld [hl], a
|
|
.start
|
|
call StartChannel
|
|
ld a, [wStereoPanningMask]
|
|
and a
|
|
jr z, .next
|
|
|
|
; Stereo only: Play cry from the monster's side.
|
|
; This only applies in-battle.
|
|
|
|
ld a, [Options]
|
|
bit 5, a ; stereo
|
|
jr z, .next
|
|
|
|
; [Tracks] &= [CryTracks]
|
|
ld hl, Channel1Tracks - Channel1
|
|
add hl, bc
|
|
ld a, [hl]
|
|
ld hl, CryTracks
|
|
and [hl]
|
|
ld hl, Channel1Tracks - Channel1
|
|
add hl, bc
|
|
ld [hl], a
|
|
|
|
.next
|
|
pop af
|
|
dec a
|
|
jr nz, .loop
|
|
|
|
|
|
; Cries play at max volume, so we save the current volume for later.
|
|
ld a, [LastVolume]
|
|
and a
|
|
jr nz, .end
|
|
|
|
ld a, [Volume]
|
|
ld [LastVolume], a
|
|
ld a, $77
|
|
ld [Volume], a
|
|
|
|
.end
|
|
ld a, 1 ; stop playing music
|
|
ld [SFXPriority], a
|
|
call MusicOn
|
|
ret
|
|
|
|
; e8c04
|
|
|
|
_PlaySFX:: ; e8c04
|
|
; clear channels if they aren't already
|
|
call MusicOff
|
|
ld hl, Channel5Flags
|
|
bit SOUND_CHANNEL_ON, [hl] ; ch5 on?
|
|
jr z, .ch6
|
|
res SOUND_CHANNEL_ON, [hl] ; turn it off
|
|
xor a
|
|
ld [rNR11], a ; length/wavepattern = 0
|
|
ld a, $8
|
|
ld [rNR12], a ; envelope = 0
|
|
xor a
|
|
ld [rNR13], a ; frequency lo = 0
|
|
ld a, $80
|
|
ld [rNR14], a ; restart sound (freq hi = 0)
|
|
xor a
|
|
ld [SoundInput], a ; global sound off
|
|
ld [rNR10], a ; sweep = 0
|
|
.ch6
|
|
ld hl, Channel6Flags
|
|
bit SOUND_CHANNEL_ON, [hl]
|
|
jr z, .ch7
|
|
res SOUND_CHANNEL_ON, [hl] ; turn it off
|
|
xor a
|
|
ld [rNR21], a ; length/wavepattern = 0
|
|
ld a, $8
|
|
ld [rNR22], a ; envelope = 0
|
|
xor a
|
|
ld [rNR23], a ; frequency lo = 0
|
|
ld a, $80
|
|
ld [rNR24], a ; restart sound (freq hi = 0)
|
|
.ch7
|
|
ld hl, Channel7Flags
|
|
bit SOUND_CHANNEL_ON, [hl]
|
|
jr z, .ch8
|
|
res SOUND_CHANNEL_ON, [hl] ; turn it off
|
|
xor a
|
|
ld [rNR30], a ; sound mode #3 off
|
|
ld [rNR31], a ; length/wavepattern = 0
|
|
ld a, $8
|
|
ld [rNR32], a ; envelope = 0
|
|
xor a
|
|
ld [rNR33], a ; frequency lo = 0
|
|
ld a, $80
|
|
ld [rNR34], a ; restart sound (freq hi = 0)
|
|
.ch8
|
|
ld hl, Channel8Flags
|
|
bit SOUND_CHANNEL_ON, [hl]
|
|
jr z, .chscleared
|
|
res SOUND_CHANNEL_ON, [hl] ; turn it off
|
|
xor a
|
|
ld [rNR41], a ; length/wavepattern = 0
|
|
ld a, $8
|
|
ld [rNR42], a ; envelope = 0
|
|
xor a
|
|
ld [rNR43], a ; frequency lo = 0
|
|
ld a, $80
|
|
ld [rNR44], a ; restart sound (freq hi = 0)
|
|
xor a
|
|
ld [NoiseSampleAddressLo], a
|
|
ld [NoiseSampleAddressHi], a
|
|
.chscleared
|
|
; start reading sfx header for # chs
|
|
ld hl, MusicID
|
|
ld [hl], e
|
|
inc hl
|
|
ld [hl], d
|
|
ld hl, SFX
|
|
add hl, de ; three
|
|
add hl, de ; byte
|
|
add hl, de ; pointers
|
|
; get bank
|
|
ld a, [hli]
|
|
ld [MusicBank], a
|
|
; get address
|
|
ld e, [hl]
|
|
inc hl
|
|
ld d, [hl]
|
|
; get # channels
|
|
call LoadMusicByte
|
|
rlca ; top 2
|
|
rlca ; bits
|
|
and $3
|
|
inc a ; # channels -> # loops
|
|
.startchannels
|
|
push af
|
|
call LoadChannel ; bc = current channel
|
|
ld hl, Channel1Flags - Channel1
|
|
add hl, bc
|
|
set SOUND_SFX, [hl]
|
|
call StartChannel
|
|
pop af
|
|
dec a
|
|
jr nz, .startchannels
|
|
call MusicOn
|
|
xor a
|
|
ld [SFXPriority], a
|
|
ret
|
|
|
|
; e8ca6
|
|
|
|
|
|
PlayStereoSFX:: ; e8ca6
|
|
; play sfx de
|
|
|
|
call MusicOff
|
|
|
|
; standard procedure if stereo's off
|
|
ld a, [Options]
|
|
bit 5, a
|
|
jp z, _PlaySFX
|
|
|
|
; else, let's go ahead with this
|
|
ld hl, MusicID
|
|
ld [hl], e
|
|
inc hl
|
|
ld [hl], d
|
|
|
|
; get sfx ptr
|
|
ld hl, SFX
|
|
rept 3
|
|
add hl, de
|
|
endr
|
|
|
|
; bank
|
|
ld a, [hli]
|
|
ld [MusicBank], a
|
|
; address
|
|
ld e, [hl]
|
|
inc hl
|
|
ld d, [hl]
|
|
|
|
; bit 2-3
|
|
call LoadMusicByte
|
|
rlca
|
|
rlca
|
|
and 3 ; ch1-4
|
|
inc a
|
|
|
|
.loop
|
|
push af
|
|
call LoadChannel
|
|
|
|
ld hl, Channel1Flags - Channel1
|
|
add hl, bc
|
|
set SOUND_SFX, [hl]
|
|
|
|
push de
|
|
; get tracks for this channel
|
|
ld a, [CurChannel]
|
|
and 3 ; ch1-4
|
|
ld e, a
|
|
ld d, 0
|
|
call GetLRTracks
|
|
add hl, de
|
|
ld a, [hl]
|
|
ld hl, wStereoPanningMask
|
|
and [hl]
|
|
|
|
ld hl, Channel1Tracks - Channel1
|
|
add hl, bc
|
|
ld [hl], a
|
|
|
|
ld hl, Channel1Field0x30 - Channel1 ; $c131 - Channel1
|
|
add hl, bc
|
|
ld [hl], a
|
|
|
|
ld a, [CryTracks]
|
|
cp 2 ; ch 1-2
|
|
jr c, .skip
|
|
|
|
; ch3-4
|
|
ld a, [wSFXDuration]
|
|
|
|
ld hl, Channel1Field0x2e - Channel1 ; $c12f - Channel1
|
|
add hl, bc
|
|
ld [hl], a
|
|
|
|
ld hl, Channel1Field0x2f - Channel1 ; $c130 - Channel1
|
|
add hl, bc
|
|
ld [hl], a
|
|
|
|
ld hl, Channel1Flags2 - Channel1
|
|
add hl, bc
|
|
set SOUND_UNKN_0F, [hl]
|
|
|
|
.skip
|
|
pop de
|
|
|
|
; turn channel on
|
|
ld hl, Channel1Flags - Channel1
|
|
add hl, bc
|
|
set SOUND_CHANNEL_ON, [hl] ; on
|
|
|
|
; done?
|
|
pop af
|
|
dec a
|
|
jr nz, .loop
|
|
|
|
; we're done
|
|
call MusicOn
|
|
ret
|
|
|
|
; e8d1b
|
|
|
|
|
|
LoadChannel: ; e8d1b
|
|
; prep channel for use
|
|
; input:
|
|
; de:
|
|
; get pointer to current channel
|
|
call LoadMusicByte
|
|
inc de
|
|
and $7 ; bit 0-2 (current channel)
|
|
ld [CurChannel], a
|
|
ld c, a
|
|
ld b, 0
|
|
ld hl, ChannelPointers
|
|
rept 2
|
|
add hl, bc
|
|
endr
|
|
ld c, [hl]
|
|
inc hl
|
|
ld b, [hl] ; bc = channel pointer
|
|
ld hl, Channel1Flags - Channel1
|
|
add hl, bc
|
|
res SOUND_CHANNEL_ON, [hl] ; channel off
|
|
call ChannelInit
|
|
; load music pointer
|
|
ld hl, Channel1MusicAddress - Channel1
|
|
add hl, bc
|
|
call LoadMusicByte
|
|
ld [hli], a
|
|
inc de
|
|
call LoadMusicByte
|
|
ld [hl], a
|
|
inc de
|
|
; load music id
|
|
ld hl, Channel1MusicID - Channel1
|
|
add hl, bc
|
|
ld a, [MusicIDLo]
|
|
ld [hli], a
|
|
ld a, [MusicIDHi]
|
|
ld [hl], a
|
|
; load music bank
|
|
ld hl, Channel1MusicBank - Channel1
|
|
add hl, bc
|
|
ld a, [MusicBank]
|
|
ld [hl], a
|
|
ret
|
|
|
|
; e8d5b
|
|
|
|
ChannelInit: ; e8d5b
|
|
; make sure channel is cleared
|
|
; set default tempo and note length in case nothing is loaded
|
|
; input:
|
|
; bc = channel struct pointer
|
|
push de
|
|
xor a
|
|
; get channel struct location and length
|
|
ld hl, Channel1MusicID - Channel1 ; start
|
|
add hl, bc
|
|
ld e, Channel2 - Channel1 ; channel struct length
|
|
; clear channel
|
|
.loop
|
|
ld [hli], a
|
|
dec e
|
|
jr nz, .loop
|
|
; set tempo to default ($100)
|
|
ld hl, Channel1Tempo - Channel1
|
|
add hl, bc
|
|
xor a
|
|
ld [hli], a
|
|
inc a
|
|
ld [hl], a
|
|
; set note length to default ($1) (fast)
|
|
ld hl, Channel1NoteLength - Channel1
|
|
add hl, bc
|
|
ld [hl], a
|
|
pop de
|
|
ret
|
|
|
|
; e8d76
|
|
|
|
LoadMusicByte:: ; e8d76
|
|
; input:
|
|
; de = current music address
|
|
; output:
|
|
; a = CurMusicByte
|
|
ld a, [MusicBank]
|
|
call _LoadMusicByte
|
|
ld a, [CurMusicByte]
|
|
ret
|
|
|
|
; e8d80
|
|
|
|
FrequencyTable: ; e8d80
|
|
dw 0 ; filler
|
|
dw $f82c
|
|
dw $f89d
|
|
dw $f907
|
|
dw $f96b
|
|
dw $f9ca
|
|
dw $fa23
|
|
dw $fa77
|
|
dw $fac7
|
|
dw $fb12
|
|
dw $fb58
|
|
dw $fb9b
|
|
dw $fbda
|
|
dw $fc16
|
|
dw $fc4e
|
|
dw $fc83
|
|
dw $fcb5
|
|
dw $fce5
|
|
dw $fd11
|
|
dw $fd3b
|
|
dw $fd63
|
|
dw $fd89
|
|
dw $fdac
|
|
dw $fdcd
|
|
dw $fded
|
|
; e8db2
|
|
|
|
WaveSamples: ; e8db2
|
|
; these are streams of 32 4-bit values used as wavepatterns
|
|
; nothing interesting here!
|
|
dn 0, 2, 4, 6, 8, 10, 12, 14, 15, 15, 15, 14, 14, 13, 13, 12, 12, 11, 10, 9, 8, 7, 6, 5, 4, 4, 3, 3, 2, 2, 1, 1
|
|
dn 0, 2, 4, 6, 8, 10, 12, 14, 14, 15, 15, 15, 15, 14, 14, 14, 13, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 2, 1, 1
|
|
dn 1, 3, 6, 9, 11, 13, 14, 14, 14, 14, 15, 15, 15, 15, 14, 13, 13, 14, 15, 15, 15, 15, 14, 14, 14, 14, 13, 11, 9, 6, 3, 1
|
|
dn 0, 2, 4, 6, 8, 10, 12, 13, 14, 15, 15, 14, 13, 14, 15, 15, 14, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0
|
|
dn 0, 1, 2, 3, 4, 5, 6, 7, 8, 10, 12, 13, 14, 14, 15, 7, 7, 15, 14, 14, 13, 12, 10, 8, 7, 6, 5, 4, 3, 2, 1, 0
|
|
dn 0, 0, 1, 1, 2, 2, 3, 3, 4, 4, 3, 3, 2, 2, 1, 1, 15, 15, 14, 14, 12, 12, 10, 10, 8, 8, 10, 10, 12, 12, 14, 14
|
|
dn 0, 2, 4, 6, 8, 10, 12, 14, 12, 11, 10, 9, 8, 7, 6, 5, 15, 15, 15, 14, 14, 13, 13, 12, 4, 4, 3, 3, 2, 2, 1, 1
|
|
dn 12, 0, 10, 9, 8, 7, 15, 5, 15, 15, 15, 14, 14, 13, 13, 12, 4, 4, 3, 3, 2, 2, 15, 1, 0, 2, 4, 6, 8, 10, 12, 14
|
|
dn 4, 4, 3, 3, 2, 2, 1, 15, 0, 0, 4, 6, 8, 10, 12, 14, 15, 8, 15, 14, 14, 13, 13, 12, 12, 11, 10, 9, 8, 7, 6, 5
|
|
dn 1, 1, 0, 0, 0, 0, 0, 8, 0, 0, 1, 3, 5, 7, 9, 10, 11, 4, 11, 10, 10, 9, 9, 8, 8, 7, 6, 5, 4, 3, 2, 1
|
|
; e8e52
|
|
|
|
Drumkits: ; e8e52
|
|
dw Drumkit0
|
|
dw Drumkit1
|
|
dw Drumkit2
|
|
dw Drumkit3
|
|
dw Drumkit4
|
|
dw Drumkit5
|
|
; e8e5e
|
|
|
|
Drumkit0: ; e8e5e
|
|
dw Drum00 ; rest
|
|
dw Snare1 ; c
|
|
dw Snare2 ; c#
|
|
dw Snare3 ; d
|
|
dw Snare4 ; d#
|
|
dw Drum05 ; e
|
|
dw Triangle1 ; f
|
|
dw Triangle2 ; f#
|
|
dw HiHat1 ; g
|
|
dw Snare5 ; g#
|
|
dw Snare6 ; a
|
|
dw Snare7 ; a#
|
|
dw HiHat2 ; b
|
|
Drumkit1: ; e8e78
|
|
dw Drum00
|
|
dw HiHat1
|
|
dw Snare5
|
|
dw Snare6
|
|
dw Snare7
|
|
dw HiHat2
|
|
dw HiHat3
|
|
dw Snare8
|
|
dw Triangle3
|
|
dw Triangle4
|
|
dw Snare9
|
|
dw Snare10
|
|
dw Snare11
|
|
Drumkit2: ; e8e92
|
|
dw Drum00
|
|
dw Snare1
|
|
dw Snare9
|
|
dw Snare10
|
|
dw Snare11
|
|
dw Drum05
|
|
dw Triangle1
|
|
dw Triangle2
|
|
dw HiHat1
|
|
dw Snare5
|
|
dw Snare6
|
|
dw Snare7
|
|
dw HiHat2
|
|
Drumkit3: ; e8eac
|
|
dw Drum21
|
|
dw Snare12
|
|
dw Snare13
|
|
dw Snare14
|
|
dw Kick1
|
|
dw Triangle5
|
|
dw Drum20
|
|
dw Drum27
|
|
dw Drum28
|
|
dw Drum29
|
|
dw Drum21
|
|
dw Kick2
|
|
dw Crash2
|
|
Drumkit4: ; e8ec6
|
|
dw Drum21
|
|
dw Drum20
|
|
dw Snare13
|
|
dw Snare14
|
|
dw Kick1
|
|
dw Drum33
|
|
dw Triangle5
|
|
dw Drum35
|
|
dw Drum31
|
|
dw Drum32
|
|
dw Drum36
|
|
dw Kick2
|
|
dw Crash1
|
|
Drumkit5: ; e8ee0
|
|
dw Drum00
|
|
dw Snare9
|
|
dw Snare10
|
|
dw Snare11
|
|
dw Drum27
|
|
dw Drum28
|
|
dw Drum29
|
|
dw Drum05
|
|
dw Triangle1
|
|
dw Crash1
|
|
dw Snare14
|
|
dw Snare13
|
|
dw Kick2
|
|
; e8efa
|
|
|
|
Drum00: ; e8efa
|
|
; unused
|
|
noise C#, 1, $11, $00
|
|
endchannel
|
|
; e8efe
|
|
|
|
Snare1: ; e8efe
|
|
noise C#, 1, $c1, $33
|
|
endchannel
|
|
; e8f02
|
|
|
|
Snare2: ; e8f02
|
|
noise C#, 1, $b1, $33
|
|
endchannel
|
|
; e8f06
|
|
|
|
Snare3: ; e8f06
|
|
noise C#, 1, $a1, $33
|
|
endchannel
|
|
; e8f0a
|
|
|
|
Snare4: ; e8f0a
|
|
noise C#, 1, $81, $33
|
|
endchannel
|
|
; e8f0e
|
|
|
|
Drum05: ; e8f0e
|
|
noise C#, 8, $84, $37
|
|
noise C#, 7, $84, $36
|
|
noise C#, 6, $83, $35
|
|
noise C#, 5, $83, $34
|
|
noise C#, 4, $82, $33
|
|
noise C#, 3, $81, $32
|
|
endchannel
|
|
; e8f21
|
|
|
|
Triangle1: ; e8f21
|
|
noise C#, 1, $51, $2a
|
|
endchannel
|
|
; e8f25
|
|
|
|
Triangle2: ; e8f25
|
|
noise C#, 2, $41, $2b
|
|
noise C#, 1, $61, $2a
|
|
endchannel
|
|
; e8f2c
|
|
|
|
HiHat1: ; e8f2c
|
|
noise C#, 1, $81, $10
|
|
endchannel
|
|
; e8f30
|
|
|
|
Snare5: ; e8f30
|
|
noise C#, 1, $82, $23
|
|
endchannel
|
|
; e8f34
|
|
|
|
Snare6: ; e8f34
|
|
noise C#, 1, $82, $25
|
|
endchannel
|
|
; e8f38
|
|
|
|
Snare7: ; e8f38
|
|
noise C#, 1, $82, $26
|
|
endchannel
|
|
; e8f3c
|
|
|
|
HiHat2: ; e8f3c
|
|
noise C#, 1, $a1, $10
|
|
endchannel
|
|
; e8f40
|
|
|
|
HiHat3: ; e8f40
|
|
noise C#, 1, $a2, $11
|
|
endchannel
|
|
; e8f44
|
|
|
|
Snare8: ; e8f44
|
|
noise C#, 1, $a2, $50
|
|
endchannel
|
|
; e8f48
|
|
|
|
Triangle3: ; e8f48
|
|
noise C#, 1, $a1, $18
|
|
noise C#, 1, $31, $33
|
|
endchannel
|
|
; e8f4f
|
|
|
|
Triangle4: ; e8f4f
|
|
noise C#, 3, $91, $28
|
|
noise C#, 1, $71, $18
|
|
endchannel
|
|
; e8f56
|
|
|
|
Snare9: ; e8f56
|
|
noise C#, 1, $91, $22
|
|
endchannel
|
|
; e8f5a
|
|
|
|
Snare10: ; e8f5a
|
|
noise C#, 1, $71, $22
|
|
endchannel
|
|
; e8f5e
|
|
|
|
Snare11: ; e8f5e
|
|
noise C#, 1, $61, $22
|
|
endchannel
|
|
; e8f62
|
|
|
|
Drum20: ; e8f62
|
|
noise C#, 1, $11, $11
|
|
endchannel
|
|
; e8f66
|
|
|
|
Drum21: ; e8f66
|
|
endchannel
|
|
; e8f67
|
|
|
|
Snare12: ; e8f67
|
|
noise C#, 1, $91, $33
|
|
endchannel
|
|
; e8f6b
|
|
|
|
Snare13: ; e8f6b
|
|
noise C#, 1, $51, $32
|
|
endchannel
|
|
; e8f6f
|
|
|
|
Snare14: ; e8f6f
|
|
noise C#, 1, $81, $31
|
|
endchannel
|
|
; e8f73
|
|
|
|
Kick1: ; e8f73
|
|
noise C#, 1, $88, $6b
|
|
noise C#, 1, $71, $00
|
|
endchannel
|
|
; e8f7a
|
|
|
|
Triangle5: ; e8f7a
|
|
noise D_, 1, $91, $18
|
|
endchannel
|
|
; e8f7e
|
|
|
|
Drum27: ; e8f7e
|
|
noise C#, 8, $92, $10
|
|
endchannel
|
|
; e8f82
|
|
|
|
Drum28: ; e8f82
|
|
noise D_, 4, $91, $00
|
|
noise D_, 4, $11, $00
|
|
endchannel
|
|
; e8f89
|
|
|
|
Drum29: ; e8f89
|
|
noise D_, 4, $91, $11
|
|
noise D_, 4, $11, $00
|
|
endchannel
|
|
; e8f90
|
|
|
|
Crash1: ; e8f90
|
|
noise D_, 4, $88, $15
|
|
noise C#, 1, $65, $12
|
|
endchannel
|
|
; e8f97
|
|
|
|
Drum31: ; e8f97
|
|
noise D_, 4, $51, $21
|
|
noise D_, 4, $11, $11
|
|
endchannel
|
|
; e8f9e
|
|
|
|
Drum32: ; e8f9e
|
|
noise D_, 4, $51, $50
|
|
noise D_, 4, $11, $11
|
|
endchannel
|
|
; e8fa5
|
|
|
|
Drum33: ; e8fa5
|
|
noise C#, 1, $a1, $31
|
|
endchannel
|
|
; e8fa9
|
|
|
|
Crash2: ; e8fa9
|
|
noise C#, 1, $84, $12
|
|
endchannel
|
|
; e8fad
|
|
|
|
Drum35: ; e8fad
|
|
noise D_, 4, $81, $00
|
|
noise D_, 4, $11, $00
|
|
endchannel
|
|
; e8fb4
|
|
|
|
Drum36: ; e8fb4
|
|
noise D_, 4, $81, $21
|
|
noise D_, 4, $11, $11
|
|
endchannel
|
|
; e8fbb
|
|
|
|
Kick2: ; e8fbb
|
|
noise C#, 1, $a8, $6b
|
|
noise C#, 1, $71, $00
|
|
endchannel
|
|
; e8fc2
|
|
|
|
GetLRTracks: ; e8fc2
|
|
; gets the default sound l/r channels
|
|
; stores mono/stereo table in hl
|
|
ld a, [Options]
|
|
bit 5, a ; stereo
|
|
; made redundant, could have had a purpose in gold
|
|
jr nz, .stereo
|
|
ld hl, MonoTracks
|
|
ret
|
|
|
|
.stereo
|
|
ld hl, StereoTracks
|
|
ret
|
|
|
|
; e8fd1
|
|
|
|
MonoTracks: ; e8fd1
|
|
; bit corresponds to track #
|
|
; hi: left channel
|
|
; lo: right channel
|
|
db $11, $22, $44, $88
|
|
; e8fd5
|
|
|
|
StereoTracks: ; e8fd5
|
|
; made redundant
|
|
; seems to be modified on a per-song basis
|
|
db $11, $22, $44, $88
|
|
; e8fd9
|
|
|
|
ChannelPointers: ; e8fd9
|
|
; music channels
|
|
dw Channel1
|
|
dw Channel2
|
|
dw Channel3
|
|
dw Channel4
|
|
; sfx channels
|
|
dw Channel5
|
|
dw Channel6
|
|
dw Channel7
|
|
dw Channel8
|
|
; e8fe9
|
|
|
|
ClearChannels:: ; e8fe9
|
|
; runs ClearChannel for all 4 channels
|
|
; doesn't seem to be used, but functionally identical to MapSetup_Sound_Off
|
|
ld hl, rNR50
|
|
xor a
|
|
rept 2
|
|
ld [hli], a
|
|
endr
|
|
ld a, $80
|
|
ld [hli], a
|
|
ld hl, rNR10
|
|
ld e, $4
|
|
.loop
|
|
call ClearChannel
|
|
dec e
|
|
jr nz, .loop
|
|
ret
|
|
|
|
; e8ffe
|
|
|
|
ClearChannel: ; e8ffe
|
|
; input: hl = beginning hw sound register (rNR10, rNR20, rNR30, rNR40)
|
|
; output: 00 00 80 00 80
|
|
|
|
; sound channel 1 2 3 4
|
|
xor a
|
|
ld [hli], a ; rNR10, rNR20, rNR30, rNR40 ; sweep = 0
|
|
|
|
ld [hli], a ; rNR11, rNR21, rNR31, rNR41 ; length/wavepattern = 0
|
|
ld a, $8
|
|
ld [hli], a ; rNR12, rNR22, rNR32, rNR42 ; envelope = 0
|
|
xor a
|
|
ld [hli], a ; rNR13, rNR23, rNR33, rNR43 ; frequency lo = 0
|
|
ld a, $80
|
|
ld [hli], a ; rNR14, rNR24, rNR34, rNR44 ; restart sound (freq hi = 0)
|
|
ret
|
|
|
|
; e900a
|