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DevSound.asm
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; ================================================================
; DevSound - a Game Boy music system by DevEd
;
; Copyright (c) 2017 - 2018 DevEd
;
; Permission is hereby granted, free of charge, to any person obtaining
; a copy of this software and associated documentation files (the
; "Software"), to deal in the Software without restriction, including
; without limitation the rights to use, copy, modify, merge, publish,
; distribute, sublicense, and/or sell copies of the Software, and to
; permit persons to whom the Software is furnished to do so, subject to
; the following conditions:
;
; The above copyright notice and this permission notice shall be included
; in all copies or substantial portions of the Software.
;
; THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
; EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
; MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
; IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
; CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
; TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
; SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
; ================================================================
; Uncomment the following line to enable custom hooks.
; UseCustomHooks set 1
; Uncomment the following line if you want the DevSound player code to be in ROM0 instead of its own bank.
; Could be useful for multibank setups.
; TODO: Make some tweaks to song data format to allow for multiple banks
; UseROM0 set 1
; Uncomment the following line if you want to include song data elsewhere.
; Could be useful for multibank setups.
; TODO: Make some tweaks to song data format to allow for multiple banks
; DontIncludeSongData set 1
; Comment the following line to disable SFX support (via FX Hammer).
; Useful if you want to use your own sound effect system.
; (Note that DevSound may require some minor modifications if you
; want to use your own SFX system.)
UseFXHammer set 1
; Uncomment this to disable all time-consuming features
; This includes: wave buffer, PWM, random wave, zombie mode,
; wave volume scaling, channel volume
; WARNING: Any songs that use the additional features will crash DevSound!
; DemoSceneMode set 1
; Uncomment this to to disable wave volume scaling.
; PROS: Less CPU usage
; CONS: Less volume control for CH3
; NoWaveVolumeScaling set 1
; Uncomment this to disable zombie mode (for compatibility
; with old emulators such as VBA).
; NOTE: Zombie mode is known to be problematic with certain
; GBC CPU revisions. If you want your game/demo to be
; compatible with all GBC hardware revisions, I would
; recommend disabling this.
; PROS: Less CPU usage
; Compatible with old emulators such as VBA
; CONS: Volume envelopes will sound "dirtier"
; DisableZombieMode set 1
; Comment this line to enable Deflemask compatibility hacks.
DisableDeflehacks set 1
; Uncomment this line for a simplified echo buffer. Useful if RAM usage
; is a concern.
; PROS: Less RAM usage
; CONS: Echo delay will be disabled
; SimpleEchoBuffer set 1
if !def(UseFXHammerDisasm)
FXHammer_SFXCH2 equ $c7cc
FXHammer_SFXCH4 equ $c7d9
endc
DevSound:
include "DevSound_Vars.asm"
include "DevSound_Consts.asm"
include "DevSound_Macros.asm"
if !def(UseROM0)
SECTION "DevSound",ROMX
else
SECTION "DevSound",ROM0
endc
if !def(UseCustomHooks)
DevSound_JumpTable:
DS_Init: jp DevSound_Init
DS_Play: jp DevSound_Play
DS_Stop: jp DevSound_Stop
DS_Fade: jp DevSound_Fade
DS_ExternalCommand: jp DevSound_ExternalCommand
endc
; Driver thumbprint
db "DevSound GB music player by DevEd | email: deved8@gmail.com"
; ================================================================
; Init routine
; INPUT: a = ID of song to init
; ================================================================
DevSound_Init:
di
push af ; Preserve song ID
xor a
ldh [rNR52],a ; disable sound
ld [PWMEnabled],a
ld [RandomizerEnabled],a
ld [WaveBufUpdateFlag],a
; init sound RAM area
ld de,DefaultRegTable
ld hl,InitVarsStart
ld c,DSVarsEnd-InitVarsStart
.initLoop
ld a,[de]
ld [hl+],a
inc de
dec c
jr nz,.initLoop
xor a
ld c,DSBufVarsEnd-DSBufVars
.initLoop2
ld [hl+],a
dec c
jr nz,.initLoop2
; load default waveform
ld hl,DefaultWave
call LoadWave
; clear buffers
call ClearWaveBuffer
call ClearArpBuffer
call ClearEchoBuffers
pop af
add a
ld e,a
adc a,0
sub e
ld d,a
; set up song pointers
ld hl,SongPointerTable
add hl,de
ld a,[hl+]
ld h,[hl]
ld l,a
ld a,[hl+]
ld [CH1Ptr],a
ld a,[hl+]
ld [CH1Ptr+1],a
ld a,[hl+]
ld [CH2Ptr],a
ld a,[hl+]
ld [CH2Ptr+1],a
ld a,[hl+]
ld [CH3Ptr],a
ld a,[hl+]
ld [CH3Ptr+1],a
ld a,[hl+]
ld [CH4Ptr],a
ld a,[hl+]
ld [CH4Ptr+1],a
ld a,low(DummyChannel)
ld [CH1RetPtr],a
ld [CH2RetPtr],a
ld [CH3RetPtr],a
ld [CH4RetPtr],a
ld a,high(DummyChannel)
ld [CH1RetPtr+1],a
ld [CH2RetPtr+1],a
ld [CH3RetPtr+1],a
ld [CH4RetPtr+1],a
ld a,$11
ld [CH1Pan],a
ld [CH2Pan],a
ld [CH3Pan],a
ld [CH4Pan],a
ld a,15
ld [CH1ChanVol],a
ld [CH2ChanVol],a
ld [CH3ChanVol],a
ld [CH4ChanVol],a
; get tempo
ld hl,SongSpeedTable
add hl,de
ld a,[hl+]
dec a
ld [GlobalSpeed1],a
ld a,[hl]
dec a
ld [GlobalSpeed2],a
ld a,%10000000
ldh [rNR52],a
ld a,$FF
ldh [rNR51],a
ld a,7
ld [GlobalVolume],a
; if visualizer is enabled, init it too
if def(Visualizer)
if !def(DemoSceneMode) && !def(NoWaveVolumeScaling)
CopyBytes DefaultWave,VisualizerTempWave,16
endc
call VisualizerInit
endc
reti
; ================================================================
; External command processing routine
; INPUT: a = command ID
; bc = parameters
; ================================================================
DevSound_ExternalCommand:
cp (.commandTableEnd-.commandTable)/2
ret nc ; if command ID is out of bounds, exit
ld hl,.commandTable
add a
add l
ld l,a
jr nc,.nocarry
inc h
.nocarry
ld a,[hl+]
ld h,[hl]
ld l,a
jp hl
.commandTable
dw .dummy ; $00 - dummy
dw .setSpeed ; $01 - set speed
dw .muteChannel ; $02 - mute given sound channel (TODO)
.commandTableEnd
.setSpeed
ld a,b
ld [GlobalSpeed1],a
ld a,c
ld [GlobalSpeed2],a
; ret
.muteChannel ; TODO
; ld a,c
; and 3
.dummy
ret
; ================================================================
; Stop routine
; ================================================================
DevSound_Stop:
ld c,low(rNR52)
xor a
ld [c],a ; disable sound output (resets all sound regs)
set 7,a
ld [c],a ; enable sound output
dec c
xor a
ld [CH1Enabled],a
ld [CH2Enabled],a
ld [CH3Enabled],a
ld [CH4Enabled],a
ld [SoundEnabled],a
dec a ; Set a to $FF
ld [c],a ; all sound channels to left+right speakers
dec c
and $77
ld [c],a ; VIN output off + master volume max
; if visualizer is enabled, init it too (to make everything zero)
if def(Visualizer)
jp VisualizerInit
else
ret
endc
; ================================================================
; Fade routine
; Note: if planning to call both this and DS_Init, call this first.
; ================================================================
DevSound_Fade:
and 3
cp 3
ret z ; 3 is an invalid value, silently ignore it
inc a ; Increment...
set 2,a ; Mark this fade as the first
ld [FadeType],a
ld a,7
ld [FadeTimer],a
ret
; ================================================================
; Play routine
; ================================================================
DevSound_Play:
; Since this routine is called during an interrupt (which may
; happen in the middle of a routine), preserve all register
; values just to be safe.
; Other registers are saved at `.doUpdate`.
push af
ld a,[SoundEnabled]
and a
jr nz,.doUpdate ; if sound is enabled, jump ahead
pop af
ret
.doUpdate
push bc
push de
push hl
; do stuff with sync tick
ld a,[SyncTick]
and a
jr z,.getSongTimer
dec a
ld [SyncTick],a
.getSongTimer
ld a,[GlobalTimer] ; get global timer
and a ; is GlobalTimer non-zero?
jr nz,.noupdate ; if yes, don't update
ld a,[TickCount] ; get current tick count
xor 1 ; toggle between 0 and 1
ld [TickCount],a ; store it in RAM
jr nz,.odd ; if a is 1, jump
.even
ld a,[GlobalSpeed2]
jr .setTimer
.odd
ld a,[GlobalSpeed1]
.setTimer
ld [GlobalTimer],a ; store timer value
jr UpdateCH1 ; continue ahead
.noupdate
dec a ; subtract 1 from timer
ld [GlobalTimer],a ; store timer value
jp DoneUpdating ; done
; ================================================================
UpdateChannel: macro
IS_PULSE_CHANNEL equ (\1 == 1) || (\1 == 2)
IS_WAVE_CHANNEL equ \1 == 3
IS_NOISE_CHANNEL equ \1 == 4
ld a,[CH\1Enabled]
and a
jp z,CH\1Updated ; if channel is disabled, skip to next one
ld a,[CH\1Tick]
and a
jr z,.continue ; if channel tick = 0, then jump ahead
dec a ; otherwise...
ld [CH\1Tick],a ; decrement channel tick...
jp CH\1Updated ; ...and do echo buffer.
.continue
ld hl,CH\1Ptr ; get pointer
ld a,[hl+]
ld h,[hl]
ld l,a
CH\1_CheckByte:
ld a,[hl+] ; get byte
cp $ff ; if $ff...
jp z,.endChannel
cp $c9 ; if $c9...
jp z,.retSection
cp release ; if release
jp z,.release
cp ___ ; if null note...
jp z,.nullnote
cp echo ; if echo
jp z,.echo
bit 7,a ; if command...
jp nz,.getCommand
; if we have a note...
if !IS_NOISE_CHANNEL
ld b,a
xor a
ld [CH\1DoEcho],a
ld a,b
endc
.getNote
if IS_NOISE_CHANNEL
ld [CH\1ModeBackup],a
else
ld [CH\1NoteBackup],a ; set note
ld b,a
ld a,[CH\1NotePlayed]
and a
jr nz,.skipfill
ld a,b
call CH\1FillEchoBuffer
.skipfill
endc
ld a,[hl+] ; get note length
dec a ; subtract 1
ld [CH\1Tick],a ; set channel tick
ld a,l ; store back current pos
ld [CH\1Ptr],a
ld a,h
ld [CH\1Ptr+1],a
if !IS_NOISE_CHANNEL
ld a,[CH\1PortaType]
dec a ; if toneporta, don't reset everything
jr z,.noreset
endc
if !IS_WAVE_CHANNEL
if ((\1 == 2) || (\1 == 4)) && UseFXHammer
ld a,[FXHammer_SFXCH\1]
cp 3
jr z,.noupdate
endc
xor a
else
ld a, $FF
ld [CH\1Wave],a
ld a,[CH\1ComputedVol] ; Fix for volume not updating when unpausing
endc
ldh [rNR\12],a
.noupdate
xor a
if IS_NOISE_CHANNEL
ld [CH\1NoisePos],a
if !def(DisableDeflehacks)
ld [CH\1WavePos],a
endc
else
ld [CH\1ArpPos],a ; reset arp position
inc a
ld [CH\1VibPos],a ; reset vibrato position
ld hl,CH\1VibPtr
ld a,[hl+]
ld h,[hl]
ld l,a
ld a,[hl] ; get vibrato delay
ld [CH\1VibDelay],a ; set delay
endc
xor a
ld hl,CH\1Reset
if !IS_NOISE_CHANNEL
bit 0,[hl]
jr nz,.noreset_checkvol
if IS_PULSE_CHANNEL
ld [CH\1PulsePos],a
elif IS_WAVE_CHANNEL
ld [CH\1WavePos],a
endc
.noreset_checkvol
endc
bit 1,[hl]
jr nz,.noreset
ld [CH\1VolPos],a
if !IS_WAVE_CHANNEL
ld [CH\1VolLoop],a
endc
.noreset
ld a,[CH\1NoteCount]
inc a
ld [CH\1NoteCount],a
ld b,a
; check if instrument mode is 1 (alternating)
ld a,[CH\1InsMode]
and a
jr z,.noInstrumentChange
ld a,b
rra
jr nc,.notodd
ld a,[CH\1Ins1]
jr .odd
.notodd
ld a,[CH\1Ins2]
.odd
call CH\1_SetInstrument
.noInstrumentChange
if !IS_NOISE_CHANNEL
ld hl,CH\1Reset
set 7,[hl] ; signal the start of note for pitch bend
endc
jp CH\1Updated
.endChannel
xor a
ld [CH\1Enabled],a
jp CH\1Updated
.retSection
ld hl,CH\1RetPtr
ld a,[hl+]
ld [CH\1Ptr],a
ld a,[hl]
ld [CH\1Ptr+1],a
jp UpdateCH\1
.echo ; Not applicable to CH4
if !IS_NOISE_CHANNEL
ld b,a
ld a,1
ld [CH\1DoEcho],a
ld a,b
jp .getNote
endc
.nullnote
if !IS_NOISE_CHANNEL
xor a
ld [CH\1DoEcho],a
endc
ld a,[hl+]
dec a
ld [CH\1Tick],a ; set tick
ld a,l ; store back current pos
ld [CH\1Ptr],a
ld a,h
ld [CH\1Ptr+1],a
jp CH\1Updated
.release
; follows FamiTracker's behavior except only the volume table will be affected
if !IS_NOISE_CHANNEL
xor a
ld [CH\1DoEcho],a
endc
ld a,[hl+]
dec a
ld [CH\1Tick],a ; set tick
ld a,l ; store back current pos
ld [CH\1Ptr],a
ld a,h
ld [CH\1Ptr+1],a
ld hl,CH\1VolPtr
ld a,[hl+]
ld h,[hl]
ld l,a
ld b,0
.releaseloop
ld a,[hl+]
inc b
cp $ff
jr z,.norelease
cp $fe
jr nz,.releaseloop
ld a,b
inc a
ld [CH\1VolPos],a
.norelease
jp CH\1Updated
.getCommand
if !IS_NOISE_CHANNEL
ld b,a
xor a
ld [CH\1DoEcho],a
ld a,b
endc
cp DummyCommand
jp nc, CH\1_CheckByte
; Not needed because function performs "add a" which discards bit 7
; sub $80 ; subtract 128 from command value
call JumpTableBelow
dw .setInstrument
dw .setLoopPoint
dw .gotoLoopPoint
dw .callSection
dw .setChannelPtr
dw .pitchBendUp
dw .pitchBendDown
dw .setSweep
dw .setPan
dw .setSpeed
dw .setInsAlternate
if IS_WAVE_CHANNEL && !def(DemoSceneMode)
dw .randomizeWave
else
dw CH\1_CheckByte
endc
dw .combineWaves
dw .enablePWM
dw .enableRandomizer
if IS_WAVE_CHANNEL && !def(DemoSceneMode)
dw .disableAutoWave
else
dw CH\1_CheckByte
endc
dw .arp
dw .toneporta
dw .chanvol
dw .setSyncTick
dw .setEchoDelay
dw .setRepeatPoint
dw .repeatSection
dw .setMontyMode
.setInstrument
ld a,[hl+] ; get ID of instrument to switch to
push hl ; preserve HL
call CH\1_SetInstrument
pop hl ; restore HL
xor a
ld [CH\1InsMode],a ; reset instrument mode
jp CH\1_CheckByte
.setLoopPoint
ld a,l
ld [CH\1LoopPtr],a
ld a,h
ld [CH\1LoopPtr+1],a
jp CH\1_CheckByte
.gotoLoopPoint
ld hl,CH\1LoopPtr ; get loop pointer
ld a,[hl+]
ld [CH\1Ptr],a
ld a,[hl]
ld [CH\1Ptr+1],a
jp UpdateCH\1
.callSection
ld a,[hl+]
ld [CH\1Ptr],a
ld a,[hl+]
ld [CH\1Ptr+1],a
ld a,l
ld [CH\1RetPtr],a
ld a,h
ld [CH\1RetPtr+1],a
jp UpdateCH\1
.setChannelPtr
ld a,[hl+]
ld [CH\1Ptr],a
ld a,[hl]
ld [CH\1Ptr+1],a
jp UpdateCH\1
if !IS_NOISE_CHANNEL
.pitchBendUp
ld a,[hl+]
ld [CH\1PortaSpeed],a
and a
jr z,.loadPortaType
ld a,2
jr .loadPortaType
.pitchBendDown
ld a,[hl+]
ld [CH\1PortaSpeed],a
and a
jr z,.loadPortaType
ld a,3
jr .loadPortaType
.toneporta
ld a,[hl+]
ld [CH\1PortaSpeed],a
and a
jr z,.loadPortaType
ld a,1
.loadPortaType
ld [CH\1PortaType],a
jp CH\1_CheckByte
endc
if \1 == 1
.setSweep
ld a,[hl+]
ld [CH\1Sweep],a
jp CH\1_CheckByte
endc
.setPan
ld a,[hl+]
ld [CH\1Pan],a
jp CH\1_CheckByte
.setSpeed
ld a,[hl+]
dec a
ld [GlobalSpeed1],a
ld a,[hl+]
dec a
ld [GlobalSpeed2],a
jp CH\1_CheckByte
.setInsAlternate
ld a,[hl+]
ld [CH\1Ins1],a
ld a,[hl+]
ld [CH\1Ins2],a
ld a,1
ld [CH\1InsMode],a
jp CH\1_CheckByte
if IS_WAVE_CHANNEL && !def(DemoSceneMode)
.randomizeWave
push hl
call _RandomizeWave
pop hl
jp CH\1_CheckByte
.combineWaves
push bc
ld a,[hl+]
ld c,a
ld a,[hl+]
ld b,a
ld a,[hl+]
ld e,a
ld a,[hl+]
ld d,a
push hl
call _CombineWaves
pop hl
pop bc
jp CH\1_CheckByte
.enablePWM
push hl
call ClearWaveBuffer
pop hl
ld a,[hl+]
ld [PWMVol],a
ld a,[hl+]
ld [PWMSpeed],a
ld a,$ff
ld [WavePos],a
xor a
ld [PWMDir],a
ld [RandomizerEnabled],a
inc a
ld [PWMEnabled],a
ld [PWMTimer],a
jp CH\1_CheckByte
.enableRandomizer
push hl
call ClearWaveBuffer
pop hl
ld a,[hl+]
ld [RandomizerSpeed],a
xor a
ld [PWMEnabled],a
inc a
ld [RandomizerTimer],a
ld [RandomizerEnabled],a
jp CH\1_CheckByte
.disableAutoWave
xor a
ld [PWMEnabled],a
ld [RandomizerEnabled],a
jp CH\1_CheckByte
else
.combineWaves
inc hl
inc hl
.enablePWM
if IS_NOISE_CHANNEL
.arp
endc
inc hl
.enableRandomizer
endc
if IS_NOISE_CHANNEL
.pitchBendUp
.pitchBendDown
.toneporta
.setEchoDelay
endc
if \1 != 1
.setSweep
endc
inc hl
jp CH\1_CheckByte
.setSyncTick
ld a,[hl+]
ld [SyncTick],a
jp CH\1_CheckByte
.chanvol
ld a,[hl+]
and $f
ld [CH\1ChanVol],a
jp CH\1_CheckByte
if !IS_NOISE_CHANNEL
.arp
call DoArp
jp CH\1_CheckByte
.setEchoDelay
ld a,[hl+]
and $3f
ld [CH\1EchoDelay],a
jp CH\1_CheckByte
endc
.setRepeatPoint
ld a,l
ld [CH\1RepeatPtr],a
ld a,h
ld [CH\1RepeatPtr+1],a
jp CH\1_CheckByte
.repeatSection
ld a,[CH\1RepeatCount]
and a ; section currently repeating?
jr z,.notrepeating
dec a
ld [CH\1RepeatCount],a
and a
jr z,.stoprepeating
inc hl
jr .dorepeat
.notrepeating
ld a,[hl+]
dec a
ld [CH\1RepeatCount],a
ld a,1
ld [CH\1DoRepeat],a
.dorepeat
ld hl,CH\1RepeatPtr ; get loop pointer
ld a,[hl+]
ld [CH\1Ptr],a
ld a,[hl]
ld [CH\1Ptr+1],a
jp UpdateCH\1
.stoprepeating
xor a
ld [CH\1DoRepeat],a
.norepeat
inc hl
jp CH\1_CheckByte
.setMontyMode
ld a,[hl+]
and $7f ; upper bit is used as a flag
ld [CH\1MontyMode],a
ld [CH\1MontyTimer],a
jp CH\1_CheckByte
CH\1_SetInstrument:
ld hl,InstrumentTable
ld e,a
ld d,0
add hl,de
add hl,de
ld a,[hl+]
ld h,[hl]
ld l,a
; no reset flag
ld a,[hl+]
and 3
ld [CH\1Reset],a
ld b,a
; vol table
ld a,[hl+]
ld [CH\1VolPtr],a
ld a,[hl+]
ld [CH\1VolPtr+1],a
; arp table
ld a,[hl+]
if IS_NOISE_CHANNEL
ld [CH\1NoisePtr],a
else
ld [CH\1ArpPtr],a
endc
ld a,[hl+]
if IS_NOISE_CHANNEL
ld [CH\1NoisePtr+1],a
else
ld [CH\1ArpPtr+1],a
endc
if !IS_NOISE_CHANNEL || !def(DisableDeflehacks)
; pulse table
ld a,[hl+]
if IS_PULSE_CHANNEL
ld [CH\1PulsePtr],a
else
ld [CH\1WavePtr],a
endc
ld a,[hl+]
if IS_PULSE_CHANNEL
ld [CH\1PulsePtr+1],a
else
ld [CH\1WavePtr+1],a
endc
endc
if !IS_NOISE_CHANNEL
; vib table
ld a,[hl+]
ld [CH\1VibPtr],a
ld a,[hl+]
ld [CH\1VibPtr+1],a
ld hl,CH\1VibPtr
ld a,[hl+]
ld h,[hl]
ld l,a
ld a,[hl]
ld [CH\1VibDelay],a
endc
ret
CH\1Updated:
PURGE IS_PULSE_CHANNEL
PURGE IS_WAVE_CHANNEL
PURGE IS_NOISE_CHANNEL
endm
; ================================================================
UpdateCH1:
UpdateChannel 1
UpdateCH2:
UpdateChannel 2
UpdateCH3:
UpdateChannel 3
UpdateCH4:
UpdateChannel 4
; ================================================================
DoneUpdating:
call DoEchoBuffers
; update panning
ld a,[CH4Pan]
add a
ld b,a
ld a,[CH3Pan]
or b
add a
ld b,a
ld a,[CH2Pan]
or b
add a
ld b,a
ld a,[CH1Pan]
or b
ldh [rNR51],a
; update global volume + fade system
ld a,[FadeType]
ld b,a
and 3 ; Check if no fade
jr z,.updateVolume ; Update volume
bit 2,b ; Check if on first fade
jr z,.notfirstfade
res 2,b
ld a,b
ld [FadeType],a
dec a
dec a ; If fading in (value 2), volume is 0 ; otherwise, it's 7
jr z,.gotfirstfadevolume
ld a,7
.gotfirstfadevolume
ld [GlobalVolume],a
.notfirstfade
ld a,[FadeTimer]
and a
jr z,.doupdate
dec a
ld [FadeTimer],a
jr .updateVolume
.fadeout
ld a,[GlobalVolume]
and a
jr z,.fadeFinished
.decrementVolume
dec a
ld [GlobalVolume],a
jr .directlyUpdateVolume
.fadein