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DevSound.asm
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DevSound.asm
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; ================================================================
; DevSound Lite - a Game Boy music system by DevEd
;
; Copyright (c) 2020 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.
; ================================================================
UseFXHammer set 1
DevSound:
include "DevSound_Defines.inc"
SECTION "DevSound",ROMX
DevSound_JumpTable:
DS_Init: jp DevSound_Init
DS_Play: jp DevSound_Play
DS_Stop: jp DevSound_Stop
; Driver thumbprint
db "DevSound Lite by DevEd | email: deved8@gmail.com"
; ================================================================
; Init routine
; INPUT: a = ID of song to init
; ================================================================
DevSound_Init:
ld c,a ; Preserve song ID
xor a
ldh [rNR52],a ; disable sound
ld [PWMEnabled],a
ld [WaveBufUpdateFlag],a
; init sound RAM area
ld de,GlobalVolume
ld b,DSVarsEnd-GlobalVolume
ld hl,DefaultRegTable
.initLoop
ld a,[hl+]
ld [de],a
inc de
dec b
jr nz,.initLoop
ld d,c ; Transfer song ID
; load default waveform
ld hl,DefaultWave
call LoadWave
call ClearWaveBuffer
call ClearArpBuffer
; set up song pointers
ld hl,SongPointerTable
ld a,d
add a
add l
ld l,a
jr nc,.nocarry
inc h
.nocarry ; HERE BE HACKS
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 hl,DummyChannel
ld a,[hl+]
ld h,[hl]
ld l,a
ld a,[hl+]
ld [CH1RetPtr],a
ld [CH2RetPtr],a
ld [CH3RetPtr],a
ld [CH4RetPtr],a
ld a,[hl]
ld [CH1RetPtr+1],a
ld [CH2RetPtr+1],a
ld [CH3RetPtr+1],a
ld [CH4RetPtr+1],a
ld a,$11
ld [CH1Pan],a
ld [CH2Pan],a
ld [CH3Pan],a
ld [CH4Pan],a
; get tempo
ld hl,SongSpeedTable
ld a,d ; Retrieve song ID one last time
add a
add l
ld l,a
jr nc,.nocarry2
inc h
.nocarry2
ld a,[hl+]
dec a
ld [GlobalSpeed1],a
ld a,[hl]
dec a
ld [GlobalSpeed2],a
ld a,%10000000
ldh [rNR52],a
ld a,$FF
ldh [rNR51],a
ldh [rNR50],a
ret
; ================================================================
; Stop routine
; ================================================================
DevSound_Stop:
xor a
ldh [rNR52],a
ld [CH1Enabled],a
ld [CH2Enabled],a
ld [CH3Enabled],a
ld [CH4Enabled],a
ld [SoundEnabled],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
; get song timer
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
inc a ; add 1
ld [TickCount],a ; store it in RAM
rra ; check if A is odd
jr c,.odd ; if a is odd, jump
.even
ld a,[GlobalSpeed1]
jr .setTimer
.odd
ld a,[GlobalSpeed2]
.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
; ================================================================
UpdateCH1:
ld a,[CH1Enabled]
and a
jp z,UpdateCH2
ld a,[CH1Tick]
and a
jr z,.continue
dec a
ld [CH1Tick],a
jp UpdateCH2 ; too far for jr
.continue
ld hl,CH1Ptr ; get pointer
ld a,[hl+]
ld h,[hl]
ld l,a
CH1_CheckByte:
ld a,[hl+] ; get byte
cp $ff ; if $ff...
jr z,.endChannel
cp $c9 ; if $c9...
jr z,.retSection
bit 7,a ; if command...
jr nz,.getCommand
; if we have a note...
.getNote
ld [CH1Note],a ; set note
ld a,[hl+]
push hl
dec a
ld [CH1Tick],a ; set tick
xor a
ld [CH1VolPos],a
ld [CH1ArpPos],a
ldh [rNR12],a
inc a
ld [CH1VibPos],a
ld hl,CH1VibPtr
ld a,[hl+]
ld h,[hl]
ld l,a
ld a,[hl]
ld [CH1VibDelay],a
ld a,[CH1Reset]
and a
jp nz,.noreset
xor a
ld [CH1PulsePos],a
.noreset
ld a,[CH1NoteCount]
inc a
ld [CH1NoteCount],a
ld b,a
; check if instrument mode is 1 (alternating)
ld a,[CH1InsMode]
and a
jr z,.noInstrumentChange
ld a,b
rra
jr nc,.notodd
ld a,[CH1Ins1]
jr .odd
.notodd
ld a,[CH1Ins2]
.odd
call CH1_SetInstrument
.noInstrumentChange
jp CH1_DoneUpdating
.getCommand
push hl
sub $80 ; subtract 128 from command value
cp DummyCommand-$80
jr c,.nodummy
pop hl
jp CH1_CheckByte
.nodummy
add a ; multiply by 2
add a,CH1_CommandTable%256
ld l,a
adc a,CH1_CommandTable/256
sub l
ld h,a
ld a,[hl+]
ld h,[hl]
ld l,a
jp hl
.endChannel
xor a
ld [CH1Enabled],a
jp UpdateCH2
.retSection
ld a,[CH1RetPtr]
ld [CH1Ptr],a
ld a,[CH1RetPtr+1]
ld [CH1Ptr+1],a
jp UpdateCH1
CH1_DoneUpdating:
pop hl
ld a,l
ld [CH1Ptr],a
ld a,h
ld [CH1Ptr+1],a
jp UpdateCH2 ; too far for jr
CH1_CommandTable:
dw .setInstrument
dw .callSection
dw .setChannelPtr
dw .pitchBendUp
dw .pitchBendDown
dw .setSweep
dw .setPan
dw .setSpeed
dw .setInsAlternate
dw .enablePWM
dw .arp
.setInstrument
pop hl
ld a,[hl+]
push hl
call CH1_SetInstrument
xor a
ld [CH1InsMode],a
pop hl
jp CH1_CheckByte ; too far for jr
.callSection
pop hl
push hl
ld a,[hl+]
ld h,[hl]
ld l,a
ld [CH1Ptr],a
ld a,h
ld [CH1Ptr+1],a
pop hl
inc hl
inc hl
ld a,l
ld [CH1RetPtr],a
ld a,h
ld [CH1RetPtr+1],a
jp UpdateCH1 ; too far for jr
.setChannelPtr
pop hl
ld a,[hl+]
ld [CH1Ptr],a
ld a,[hl]
ld [CH1Ptr+1],a
jp UpdateCH1
.pitchBendUp ; TODO
pop hl
inc hl
jp CH1_CheckByte ; too far for jr
.pitchBendDown ; TODO
pop hl
inc hl
jp CH1_CheckByte ; too far for jr
.setSweep ; TODO
pop hl
inc hl
jp CH1_CheckByte ; too far for jr
.setPan
pop hl
ld a,[hl+]
ld [CH1Pan],a
jp CH1_CheckByte ; too far for jr
.setSpeed
pop hl
ld a,[hl+]
dec a
ld [GlobalSpeed1],a
ld a,[hl+]
dec a
ld [GlobalSpeed2],a
jp CH1_CheckByte ; too far for jr
.setInsAlternate
pop hl
ld a,[hl+]
ld [CH1Ins1],a
ld a,[hl+]
ld [CH1Ins2],a
ld a,1
ld [CH1InsMode],a
jp CH1_CheckByte
.enablePWM
pop hl
inc hl
inc hl
jp CH1_CheckByte
.arp
pop hl
call DoArp
jp CH1_CheckByte
CH1_SetInstrument:
ld hl,InstrumentTable
add a
add l
ld l,a
jr nc,.nocarry
inc h
.nocarry
ld a,[hl+]
ld h,[hl]
ld l,a
; no reset flag
ld a,[hl+]
ld [CH1Reset],a
ld b,a
; vol table
ld a,[hl+]
ld [CH1VolPtr],a
ld a,[hl+]
ld [CH1VolPtr+1],a
; arp table
ld a,[hl+]
ld [CH1ArpPtr],a
ld a,[hl+]
ld [CH1ArpPtr+1],a
; pulse table
ld a,[hl+]
ld [CH1PulsePtr],a
ld a,[hl+]
ld [CH1PulsePtr+1],a
; vib table
ld a,[hl+]
ld [CH1VibPtr],a
ld a,[hl+]
ld [CH1VibPtr+1],a
ld hl,CH1VibPtr
ld a,[hl+]
ld h,[hl]
ld l,a
ld a,[hl]
ld [CH1VibDelay],a
ret
; ================================================================
UpdateCH2:
ld a,[CH2Enabled]
and a
jp z,UpdateCH3
ld a,[CH2Tick]
and a
jr z,.continue
dec a
ld [CH2Tick],a
jp UpdateCH3 ; too far for jr
.continue
ld hl,CH2Ptr ; get pointer
ld a,[hl+]
ld h,[hl]
ld l,a
CH2_CheckByte:
ld a,[hl+] ; get byte
cp $ff ; if $ff...
jr z,.endChannel
cp $c9 ; if $c9...
jr z,.retSection
bit 7,a ; if command...
jr nz,.getCommand
; if we have a note...
.getNote
ld [CH2Note],a ; set note
ld a,[hl+]
push hl
dec a
ld [CH2Tick],a ; set tick
xor a
ld [CH2VolPos],a
ld [CH2ArpPos],a
if(UseFXHammer)
ld a,[$c7cc]
cp 3
jp z,.noupdate
endc
ldh [rNR22],a
.noupdate
inc a
ld [CH2VibPos],a
ld hl,CH2VibPtr
ld a,[hl+]
ld h,[hl]
ld l,a
ld a,[hl]
ld [CH2VibDelay],a
ld a,[CH2Reset]
and a
jp nz,.noreset
xor a
ld [CH2PulsePos],a
.noreset
ld a,[CH2NoteCount]
inc a
ld [CH2NoteCount],a
ld b,a
; check if instrument mode is 1 (alternating)
ld a,[CH2InsMode]
and a
jr z,.noInstrumentChange
ld a,b
rra
jr nc,.notodd
ld a,[CH2Ins1]
jr .odd
.notodd
ld a,[CH2Ins2]
.odd
call CH2_SetInstrument
.noInstrumentChange
jp CH2_DoneUpdating
.getCommand
push hl
sub $80 ; subtract 128 from command value
cp DummyCommand-$80
jr c,.nodummy
pop hl
jp CH2_CheckByte
.nodummy
add a ; multiply by 2
add a,CH2_CommandTable%256
ld l,a
adc a,CH2_CommandTable/256
sub l
ld h,a
ld a,[hl+]
ld h,[hl]
ld l,a
jp hl
.endChannel
xor a
ld [CH2Enabled],a
jp UpdateCH3
.retSection
ld a,[CH2RetPtr]
ld [CH2Ptr],a
ld a,[CH2RetPtr+1]
ld [CH2Ptr+1],a
jp UpdateCH2
CH2_DoneUpdating:
pop hl
ld a,l
ld [CH2Ptr],a
ld a,h
ld [CH2Ptr+1],a
jp UpdateCH3 ; too far for jr
CH2_CommandTable:
dw .setInstrument
dw .callSection
dw .setChannelPtr
dw .pitchBendUp
dw .pitchBendDown
dw .setSweep
dw .setPan
dw .setSpeed
dw .setInsAlternate
dw .enablePWM
dw .arp
.setInstrument
pop hl
ld a,[hl+]
push hl
call CH2_SetInstrument
xor a
ld [CH2InsMode],a
pop hl
jp CH2_CheckByte ; too far for jr
.callSection
pop hl
push hl
ld a,[hl+]
ld h,[hl]
ld l,a
ld [CH2Ptr],a
ld a,h
ld [CH2Ptr+1],a
pop hl
inc hl
inc hl
ld a,l
ld [CH2RetPtr],a
ld a,h
ld [CH2RetPtr+1],a
jp UpdateCH2 ; too far for jr
.setChannelPtr
pop hl
ld a,[hl+]
ld [CH2Ptr],a
ld a,[hl]
ld [CH2Ptr+1],a
jp UpdateCH2
.pitchBendUp ; TODO
pop hl
inc hl
jp CH2_CheckByte ; too far for jr
.pitchBendDown ; TODO
pop hl
inc hl
jp CH2_CheckByte ; too far for jr
.setSweep ; TODO
pop hl
inc hl
jp CH2_CheckByte ; too far for jr
.setPan
pop hl
ld a,[hl+]
ld [CH2Pan],a
jp CH2_CheckByte ; too far for jr
.setSpeed
pop hl
ld a,[hl+]
dec a
ld [GlobalSpeed1],a
ld a,[hl+]
dec a
ld [GlobalSpeed2],a
jp CH2_CheckByte ; too far for jr
.setInsAlternate
pop hl
ld a,[hl+]
ld [CH2Ins1],a
ld a,[hl+]
ld [CH2Ins2],a
ld a,1
ld [CH2InsMode],a
jp CH2_CheckByte
.enablePWM
pop hl
inc hl
inc hl
jp CH2_CheckByte
.arp
pop hl
call DoArp
jp CH2_CheckByte
CH2_SetInstrument:
ld hl,InstrumentTable
add a
add l
ld l,a
jr nc,.nocarry
inc h
.nocarry
ld a,[hl+]
ld h,[hl]
ld l,a
; no reset flag
ld a,[hl+]
ld [CH2Reset],a
ld b,a
; vol table
ld a,[hl+]
ld [CH2VolPtr],a
ld a,[hl+]
ld [CH2VolPtr+1],a
; arp table
ld a,[hl+]
ld [CH2ArpPtr],a
ld a,[hl+]
ld [CH2ArpPtr+1],a
; pulse table
ld a,[hl+]
ld [CH2PulsePtr],a
ld a,[hl+]
ld [CH2PulsePtr+1],a
; vib table
ld a,[hl+]
ld [CH2VibPtr],a
ld a,[hl+]
ld [CH2VibPtr+1],a
ld hl,CH2VibPtr
ld a,[hl+]
ld h,[hl]
ld l,a
ld a,[hl]
ld [CH2VibDelay],a
ret
; ================================================================
UpdateCH3:
ld a,[CH3Enabled]
and a
jp z,UpdateCH4
ld a,[CH3Tick]
and a
jr z,.continue
dec a
ld [CH3Tick],a
jp UpdateCH4 ; too far for jr
.continue
ld hl,CH3Ptr ; get pointer
ld a,[hl+]
ld h,[hl]
ld l,a
CH3_CheckByte:
ld a,[hl+] ; get byte
cp $ff
jr z,.endChannel
cp $c9
jr z,.retSection
bit 7,a ; check for command
jr nz,.getCommand
; if we have a note...
.getNote
ld [CH3Note],a
ld a,[hl+]
push hl
dec a
ld [CH3Tick],a
xor a
ld [CH3VolPos],a
ld [CH3ArpPos],a
ld a,1
ld [CH3VibPos],a
ld hl,CH3VibPtr
ld a,[hl+]
ld h,[hl]
ld l,a
ld a,[hl]
ld [CH3VibDelay],a
ld a,[CH3Reset]
and a
jp nz,CH3_DoneUpdating
xor a
ld [CH3WavePos],a
ld a,[CH3NoteCount]
inc a
ld [CH3NoteCount],a
ld b,a
ld a,[CH3Vol]
ldh [rNR32],a ; fix for volume not updating when unpausing
; check if instrument mode is 1 (alternating)
ld a,[CH3InsMode]
and a
jr z,.noInstrumentChange
ld a,b
rra
jr nc,.notodd
ld a,[CH3Ins1]
jr .odd
.notodd
ld a,[CH3Ins2]
.odd
call CH3_SetInstrument
.noInstrumentChange
jp CH3_DoneUpdating
.getCommand
push hl
sub $80
cp DummyCommand-$80
jr c,.nodummy
pop hl
jp CH3_CheckByte
.nodummy
add a
add a,CH3_CommandTable%256
ld l,a
adc a,CH3_CommandTable/256
sub l
ld h,a
ld a,[hl+]
ld h,[hl]
ld l,a
jp hl
.endChannel
xor a
ld [CH3Enabled],a
jp UpdateCH4
.retSection
ld a,[CH3RetPtr]
ld [CH3Ptr],a
ld a,[CH3RetPtr+1]
ld [CH3Ptr+1],a
jp UpdateCH3
CH3_DoneUpdating:
pop hl
ld a,l
ld [CH3Ptr],a
ld a,h
ld [CH3Ptr+1],a
jp UpdateCH4 ; too far for jr
CH3_CommandTable:
dw .setInstrument
dw .callSection
dw .setChannelPtr
dw .pitchBendUp
dw .pitchBendDown
dw .setSweep
dw .setPan
dw .setSpeed
dw .setInsAlternate
dw .enablePWM
dw .arp
.setInstrument
pop hl
ld a,[hl+]
push hl
call CH3_SetInstrument
pop hl
xor a
ld [CH3InsMode],a
jp CH3_CheckByte ; too far for jr
.callSection
pop hl
push hl
ld a,[hl+]
ld h,[hl]
ld l,a
ld [CH3Ptr],a
ld a,h
ld [CH3Ptr+1],a
pop hl
inc hl
inc hl
ld a,l
ld [CH3RetPtr],a
ld a,h
ld [CH3RetPtr+1],a
jp UpdateCH3 ; too far for jr
.setChannelPtr
pop hl
ld a,[hl+]
ld [CH3Ptr],a
ld a,[hl]
ld [CH3Ptr+1],a
jp UpdateCH3
.pitchBendUp ; TODO
pop hl
inc hl
jp CH3_CheckByte ; too far for jr
.pitchBendDown ; TODO
pop hl
inc hl
jp CH3_CheckByte ; too far for jr
.setSweep
pop hl
inc hl
jp CH3_CheckByte ; too far for jr
.setPan
pop hl
ld a,[hl+]
ld [CH3Pan],a
jp CH3_CheckByte ; too far for jr
.setSpeed
pop hl
ld a,[hl+]
dec a
ld [GlobalSpeed1],a
ld a,[hl+]
dec a
ld [GlobalSpeed2],a
jp CH3_CheckByte ; too far for jr
.setInsAlternate
pop hl
ld a,[hl+]
ld [CH3Ins1],a
ld a,[hl+]
ld [CH3Ins2],a
ld a,1
ld [CH3InsMode],a
jp CH3_CheckByte
.enablePWM
call ClearWaveBuffer
pop hl
ld a,[hl+]
ld [PWMVol],a
ld a,[hl+]
ld [PWMSpeed],a
ld a,$ff
ld [WavePos],a
xor a
ld [PWMDir],a
inc a
ld [PWMEnabled],a
ld [PWMTimer],a
jp CH3_CheckByte
.arp
pop hl
call DoArp
ld a,c
add 2
ld c,a
jp CH3_CheckByte
CH3_SetInstrument:
ld hl,InstrumentTable
add a
add l
ld l,a
jr nc,.nocarry
inc h
.nocarry
ld a,[hl+]
ld h,[hl]
ld l,a
; no reset flag
ld a,[hl+]
ld [CH3Reset],a
ld b,a
; vol table
ld a,[hl+]
ld [CH3VolPtr],a
ld a,[hl+]
ld [CH3VolPtr+1],a
; arp table
ld a,[hl+]
ld [CH3ArpPtr],a
ld a,[hl+]
ld [CH3ArpPtr+1],a
; wave table
ld a,[hl+]
ld [CH3WavePtr],a
ld a,[hl+]
ld [CH3WavePtr+1],a
; vib table
ld a,[hl+]
ld [CH3VibPtr],a
ld a,[hl+]
ld [CH3VibPtr+1],a
ld hl,CH3VibPtr
ld a,[hl+]
ld h,[hl]
ld l,a
ld a,[hl]
ld [CH3VibDelay],a
ret
; ================================================================
UpdateCH4:
ld a,[CH4Enabled]
and a
jp z,DoneUpdating
ld a,[CH4Tick]
and a
jr z,.continue
dec a
ld [CH4Tick],a
jp DoneUpdating ; too far for jr
.continue
ld hl,CH4Ptr ; get pointer
ld a,[hl+]
ld h,[hl]
ld l,a
CH4_CheckByte:
ld a,[hl+] ; get byte
inc c ; add 1 to offset
cp $ff
jr z,.endChannel
cp $c9
jr z,.retSection
bit 7,a ; check for command