ref: 4d61c351726b38b22e0606df23bd2fdfb13640cc
dir: /audio/engine_3.asm/
; The third of three duplicated sound engines. Audio3_UpdateMusic:: ld c, Ch0 .loop ld b, $0 ld hl, wChannelSoundIDs add hl, bc ld a, [hl] and a jr z, .nextChannel ld a, c cp Ch4 jr nc, .applyAffects ; if sfx channel ld a, [wMuteAudioAndPauseMusic] and a jr z, .applyAffects bit 7, a jr nz, .nextChannel set 7, a ld [wMuteAudioAndPauseMusic], a xor a ld [rNR51], a ld [rNR30], a ld a, $80 ld [rNR30], a jr .nextChannel .applyAffects call Audio3_ApplyMusicAffects .nextChannel ld a, c inc c ; inc channel number cp Ch7 jr nz, .loop ret ; this routine checks flags for music effects currently applied ; to the channel and calls certain functions based on flags. ; known flags for wChannelFlags1: ; 0: toggleperfectpitch has been used ; 1: call has been used ; 3: a toggle used only by this routine for vibrato ; 4: pitchbend flag ; 6: dutycycle flag Audio3_ApplyMusicAffects: ld b, $0 ld hl, wChannelNoteDelayCounters ; delay until next note add hl, bc ld a, [hl] cp $1 ; if delay is 1, play next note jp z, Audio3_PlayNextNote dec a ; otherwise, decrease the delay timer ld [hl], a ld a, c cp Ch4 jr nc, .startChecks ; if a sfx channel ld hl, wChannelSoundIDs + Ch4 add hl, bc ld a, [hl] and a jr z, .startChecks ret .startChecks ld hl, wChannelFlags1 add hl, bc bit 6, [hl] ; dutycycle jr z, .checkForExecuteMusic call Audio3_ApplyDutyCycle .checkForExecuteMusic ld b, $0 ld hl, wChannelFlags2 add hl, bc bit 0, [hl] jr nz, .checkForPitchBend ld hl, wChannelFlags1 add hl, bc bit 2, [hl] jr nz, .disablePitchBendVibrato .checkForPitchBend ld hl, wChannelFlags1 add hl, bc bit 4, [hl] ; pitchbend jr z, .checkVibratoDelay jp Audio3_ApplyPitchBend .checkVibratoDelay ld hl, wChannelVibratoDelayCounters ; vibrato delay add hl, bc ld a, [hl] and a ; check if delay is over jr z, .checkForVibrato dec [hl] ; otherwise, dec delay .disablePitchBendVibrato ret .checkForVibrato ld hl, wChannelVibratoExtents ; vibrato rate add hl, bc ld a, [hl] and a jr nz, .vibrato ret ; no vibrato .vibrato ld d, a ld hl, wChannelVibratoRates add hl, bc ld a, [hl] and $f and a jr z, .vibratoAlreadyDone dec [hl] ; apply vibrato pitch change ret .vibratoAlreadyDone ld a, [hl] swap [hl] or [hl] ld [hl], a ; reset the vibrato value and start again ld hl, wChannelFrequencyLowBytes add hl, bc ld e, [hl] ; get note pitch ld hl, wChannelFlags1 add hl, bc bit 3, [hl] ; this is the only code that sets/resets bit three so jr z, .unset ; it continuously alternates which path it takes res 3, [hl] ld a, d and $f ld d, a ld a, e sub d jr nc, .noCarry ld a, $0 .noCarry jr .done .unset set 3, [hl] ld a, d and $f0 swap a add e jr nc, .done ld a, $ff .done ld d, a ld b, $3 call Audio3_7d8ac ld [hl], d ret ; this routine executes all music commands that take up no time, ; like tempo changes, duty changes etc. and doesn't return ; until the first note is reached Audio3_PlayNextNote: ld hl, wChannelVibratoDelayCounterReloadValues add hl, bc ld a, [hl] ld hl, wChannelVibratoDelayCounters add hl, bc ld [hl], a ld hl, wChannelFlags1 add hl, bc res 4, [hl] res 5, [hl] call Audio3_endchannel ret Audio3_endchannel: call Audio3_GetNextMusicByte ld d, a cp $ff ; is this command an endchannel? jp nz, Audio3_callchannel ; no ld b, $0 ; yes ld hl, wChannelFlags1 add hl, bc bit 1, [hl] jr nz, .returnFromCall ld a, c cp Ch3 jr nc, .noiseOrSfxChannel jr .asm_7d2b3 .noiseOrSfxChannel res 2, [hl] ld hl, wChannelFlags2 add hl, bc res 0, [hl] cp Ch6 jr nz, .notSfxChannel3 ld a, $0 ld [rNR30], a ld a, $80 ld [rNR30], a .notSfxChannel3 jr nz, .asm_7d296 ld a, [wDisableChannelOutputWhenSfxEnds] and a jr z, .asm_7d296 xor a ld [wDisableChannelOutputWhenSfxEnds], a jr .asm_7d2b3 .asm_7d296 jr .asm_7d2bc .returnFromCall res 1, [hl] ld d, $0 ld a, c add a ld e, a ld hl, wChannelCommandPointers add hl, de push hl ; store current channel address ld hl, wChannelReturnAddresses add hl, de ld e, l ld d, h pop hl ld a, [de] ld [hli], a inc de ld a, [de] ld [hl], a ; loads channel address to return to jp Audio3_endchannel .asm_7d2b3 ld hl, Unknown_7db93 add hl, bc ld a, [rNR51] and [hl] ld [rNR51], a .asm_7d2bc ld a, [wChannelSoundIDs + Ch4] cp $14 jr nc, .asm_7d2c5 jr .asm_7d2e2 .asm_7d2c5 ld a, [wChannelSoundIDs + Ch4] cp $86 jr z, .asm_7d2e2 jr c, .asm_7d2d0 jr .asm_7d2e2 .asm_7d2d0 ld a, c cp Ch4 jr z, .asm_7d2d9 call Audio3_7d73b ret c .asm_7d2d9 ld a, [wSavedVolume] ld [rNR50], a xor a ld [wSavedVolume], a .asm_7d2e2 ld hl, wChannelSoundIDs add hl, bc ld [hl], b ret Audio3_callchannel: cp $fd ; is this command a callchannel? jp nz, Audio3_loopchannel ; no call Audio3_GetNextMusicByte ; yes push af call Audio3_GetNextMusicByte ld d, a pop af ld e, a push de ; store pointer ld d, $0 ld a, c add a ld e, a ld hl, wChannelCommandPointers add hl, de push hl ld hl, wChannelReturnAddresses add hl, de ld e, l ld d, h pop hl ld a, [hli] ld [de], a inc de ld a, [hld] ld [de], a ; copy current channel address pop de ld [hl], e inc hl ld [hl], d ; overwrite current address with pointer ld b, $0 ld hl, wChannelFlags1 add hl, bc set 1, [hl] ; set the call flag jp Audio3_endchannel Audio3_loopchannel: cp $fe ; is this command a loopchannel? jp nz, Audio3_notetype ; no call Audio3_GetNextMusicByte ; yes ld e, a and a jr z, .infiniteLoop ld b, $0 ld hl, wChannelLoopCounters add hl, bc ld a, [hl] cp e jr nz, .loopAgain ld a, $1 ; if no more loops to make ld [hl], a call Audio3_GetNextMusicByte ; skip pointer call Audio3_GetNextMusicByte jp Audio3_endchannel .loopAgain ; inc loop count inc a ld [hl], a ; fall through .infiniteLoop ; overwrite current address with pointer call Audio3_GetNextMusicByte push af call Audio3_GetNextMusicByte ld b, a ld d, $0 ld a, c add a ld e, a ld hl, wChannelCommandPointers add hl, de pop af ld [hli], a ld [hl], b jp Audio3_endchannel Audio3_notetype: and $f0 cp $d0 ; is this command a notetype? jp nz, Audio3_toggleperfectpitch ; no ld a, d ; yes and $f ld b, $0 ld hl, wChannelNoteSpeeds add hl, bc ld [hl], a ; store low nibble as speed ld a, c cp Ch3 jr z, .noiseChannel ; noise channel has 0 params call Audio3_GetNextMusicByte ld d, a ld a, c cp Ch2 jr z, .musicChannel3 cp Ch6 jr nz, .notChannel3 ld hl, wSfxWaveInstrument jr .sfxChannel3 .musicChannel3 ld hl, wMusicWaveInstrument .sfxChannel3 ld a, d and $f ld [hl], a ; store low nibble of param as duty ld a, d and $30 sla a ld d, a ; fall through ; if channel 3, store high nibble as volume ; else, store volume (high nibble) and fade (low nibble) .notChannel3 ld b, $0 ld hl, wChannelVolumes add hl, bc ld [hl], d .noiseChannel jp Audio3_endchannel Audio3_toggleperfectpitch: ld a, d cp $e8 ; is this command a toggleperfectpitch? jr nz, Audio3_vibrato ; no ld b, $0 ; yes ld hl, wChannelFlags1 add hl, bc ld a, [hl] xor $1 ld [hl], a ; flip bit 0 of wChannelFlags1 jp Audio3_endchannel Audio3_vibrato: cp $ea ; is this command a vibrato? jr nz, Audio3_pitchbend ; no call Audio3_GetNextMusicByte ; yes ld b, $0 ld hl, wChannelVibratoDelayCounters add hl, bc ld [hl], a ; store delay ld hl, wChannelVibratoDelayCounterReloadValues add hl, bc ld [hl], a ; store delay call Audio3_GetNextMusicByte ld d, a and $f0 swap a ld b, $0 ld hl, wChannelVibratoExtents add hl, bc srl a ld e, a adc b swap a or e ld [hl], a ; store rate as both high and low nibbles ld a, d and $f ld d, a ld hl, wChannelVibratoRates add hl, bc swap a or d ld [hl], a ; store depth as both high and low nibbles jp Audio3_endchannel Audio3_pitchbend: cp $eb ; is this command a pitchbend? jr nz, Audio3_duty ; no call Audio3_GetNextMusicByte ; yes ld b, $0 ld hl, wChannelPitchBendLengthModifiers add hl, bc ld [hl], a ; store first param call Audio3_GetNextMusicByte ld d, a and $f0 swap a ld b, a ld a, d and $f call Audio3_7d8cc ld b, $0 ld hl, wChannelPitchBendTargetFrequencyHighBytes add hl, bc ld [hl], d ; store unknown part of second param ld hl, wChannelPitchBendTargetFrequencyLowBytes add hl, bc ld [hl], e ; store unknown part of second param ld b, $0 ld hl, wChannelFlags1 add hl, bc set 4, [hl] ; set pitchbend flag call Audio3_GetNextMusicByte ld d, a jp Audio3_notelength Audio3_duty: cp $ec ; is this command a duty? jr nz, Audio3_tempo ; no call Audio3_GetNextMusicByte ; yes rrca rrca and $c0 ld b, $0 ld hl, wChannelDuties add hl, bc ld [hl], a ; store duty jp Audio3_endchannel Audio3_tempo: cp $ed ; is this command a tempo? jr nz, Audio3_stereopanning ; no ld a, c ; yes cp Ch4 jr nc, .sfxChannel call Audio3_GetNextMusicByte ld [wMusicTempo], a ; store first param call Audio3_GetNextMusicByte ld [wMusicTempo + 1], a ; store second param xor a ld [wChannelNoteDelayCountersFractionalPart], a ; clear RAM ld [wChannelNoteDelayCountersFractionalPart + 1], a ld [wChannelNoteDelayCountersFractionalPart + 2], a ld [wChannelNoteDelayCountersFractionalPart + 3], a jr .musicChannelDone .sfxChannel call Audio3_GetNextMusicByte ld [wSfxTempo], a ; store first param call Audio3_GetNextMusicByte ld [wSfxTempo + 1], a ; store second param xor a ld [wChannelNoteDelayCountersFractionalPart + 4], a ; clear RAM ld [wChannelNoteDelayCountersFractionalPart + 5], a ld [wChannelNoteDelayCountersFractionalPart + 6], a ld [wChannelNoteDelayCountersFractionalPart + 7], a .musicChannelDone jp Audio3_endchannel Audio3_stereopanning: cp $ee ; is this command a stereopanning? jr nz, Audio3_unknownmusic0xef ; no call Audio3_GetNextMusicByte ; yes ld [wStereoPanning], a ; store panning jp Audio3_endchannel ; this appears to never be used Audio3_unknownmusic0xef: cp $ef ; is this command an unknownmusic0xef? jr nz, Audio3_dutycycle ; no call Audio3_GetNextMusicByte ; yes push bc call Audio3_PlaySound pop bc ld a, [wDisableChannelOutputWhenSfxEnds] and a jr nz, .skip ld a, [wChannelSoundIDs + Ch7] ld [wDisableChannelOutputWhenSfxEnds], a xor a ld [wChannelSoundIDs + Ch7], a .skip jp Audio3_endchannel Audio3_dutycycle: cp $fc ; is this command a dutycycle? jr nz, Audio3_volume ; no call Audio3_GetNextMusicByte ; yes ld b, $0 ld hl, wChannelDutyCycles add hl, bc ld [hl], a ; store full cycle and $c0 ld hl, wChannelDuties add hl, bc ld [hl], a ; store first duty ld hl, wChannelFlags1 add hl, bc set 6, [hl] ; set duty flag jp Audio3_endchannel Audio3_volume: cp $f0 ; is this command a volume? jr nz, Audio3_executemusic ; no call Audio3_GetNextMusicByte ; yes ld [rNR50], a ; store volume jp Audio3_endchannel Audio3_executemusic: cp $f8 ; is this command an executemusic? jr nz, Audio3_octave ; no ld b, $0 ; yes ld hl, wChannelFlags2 add hl, bc set 0, [hl] jp Audio3_endchannel Audio3_octave: and $f0 cp $e0 ; is this command an octave? jr nz, Audio3_unknownsfx0x20 ; no ld hl, wChannelOctaves ; yes ld b, $0 add hl, bc ld a, d and $f ld [hl], a ; store low nibble as octave jp Audio3_endchannel Audio3_unknownsfx0x20: cp $20 ; is this command an unknownsfx0x20? jr nz, Audio3_unknownsfx0x10 ; no ld a, c cp Ch3 ; is this a noise or sfx channel? jr c, Audio3_unknownsfx0x10 ; no ld b, $0 ld hl, wChannelFlags2 add hl, bc bit 0, [hl] jr nz, Audio3_unknownsfx0x10 ; no call Audio3_notelength ; yes ld d, a ld b, $0 ld hl, wChannelDuties add hl, bc ld a, [hl] or d ld d, a ld b, $1 call Audio3_7d8ac ld [hl], d call Audio3_GetNextMusicByte ld d, a ld b, $2 call Audio3_7d8ac ld [hl], d call Audio3_GetNextMusicByte ld e, a ld a, c cp Ch7 ld a, $0 jr z, .sfxNoiseChannel ; only two params for noise channel push de call Audio3_GetNextMusicByte pop de .sfxNoiseChannel ld d, a push de call Audio3_7d69d call Audio3_7d66c pop de call Audio3_7d6bf ret Audio3_unknownsfx0x10: ld a, c cp Ch4 jr c, Audio3_note ; if not a sfx ld a, d cp $10 ; is this command an unknownsfx0x10? jr nz, Audio3_note ; no ld b, $0 ld hl, wChannelFlags2 add hl, bc bit 0, [hl] jr nz, Audio3_note ; no call Audio3_GetNextMusicByte ; yes ld [rNR10], a jp Audio3_endchannel Audio3_note: ld a, c cp Ch3 jr nz, Audio3_notelength ; if not noise channel ld a, d and $f0 cp $b0 ; is this command a dnote? jr z, Audio3_dnote ; yes jr nc, Audio3_notelength ; no swap a ld b, a ld a, d and $f ld d, a ld a, b push de push bc jr asm_7d571 Audio3_dnote: ld a, d and $f push af push bc call Audio3_GetNextMusicByte ; get dnote instrument asm_7d571 ld d, a ld a, [wDisableChannelOutputWhenSfxEnds] and a jr nz, .asm_7d57c ld a, d call Audio3_PlaySound .asm_7d57c pop bc pop de Audio3_notelength: ld a, d push af and $f inc a ld b, $0 ld e, a ; store note length (in 16ths) ld d, b ld hl, wChannelNoteSpeeds add hl, bc ld a, [hl] ld l, b call Audio3_7d8bb ld a, c cp Ch4 jr nc, .sfxChannel ld a, [wMusicTempo] ld d, a ld a, [wMusicTempo + 1] ld e, a jr .skip .sfxChannel ld d, $1 ld e, $0 cp Ch7 jr z, .skip ; if noise channel call Audio3_7d707 ld a, [wSfxTempo] ld d, a ld a, [wSfxTempo + 1] ld e, a .skip ld a, l ld b, $0 ld hl, wChannelNoteDelayCountersFractionalPart add hl, bc ld l, [hl] call Audio3_7d8bb ld e, l ld d, h ld hl, wChannelNoteDelayCountersFractionalPart add hl, bc ld [hl], e ld a, d ld hl, wChannelNoteDelayCounters add hl, bc ld [hl], a ld hl, wChannelFlags2 add hl, bc bit 0, [hl] jr nz, Audio3_notepitch ld hl, wChannelFlags1 add hl, bc bit 2, [hl] jr z, Audio3_notepitch pop hl ret Audio3_notepitch: pop af and $f0 cp $c0 ; compare to rest jr nz, .notRest ld a, c cp Ch4 jr nc, .sfxChannel ld hl, wChannelSoundIDs + Ch4 add hl, bc ld a, [hl] and a jr nz, .quit ; fall through .sfxChannel ld a, c cp Ch2 jr z, .musicChannel3 cp Ch6 jr nz, .notSfxChannel3 .musicChannel3 ld b, $0 ld hl, Unknown_7db93 add hl, bc ld a, [rNR51] and [hl] ld [rNR51], a jr .quit .notSfxChannel3 ld b, $2 call Audio3_7d8ac ld a, $8 ld [hli], a inc hl ld a, $80 ld [hl], a .quit ret .notRest swap a ld b, $0 ld hl, wChannelOctaves add hl, bc ld b, [hl] call Audio3_7d8cc ld b, $0 ld hl, wChannelFlags1 add hl, bc bit 4, [hl] jr z, .asm_7d62c call Audio3_7d803 .asm_7d62c push de ld a, c cp Ch4 jr nc, .skip ; if sfx Channel ld hl, wChannelSoundIDs + Ch4 ld d, $0 ld e, a add hl, de ld a, [hl] and a jr nz, .done jr .skip .done pop de ret .skip ld b, $0 ld hl, wChannelVolumes add hl, bc ld d, [hl] ld b, $2 call Audio3_7d8ac ld [hl], d call Audio3_7d69d call Audio3_7d66c pop de ld b, $0 ld hl, wChannelFlags1 add hl, bc bit 0, [hl] ; has toggleperfectpitch been used? jr z, .skip2 inc e ; if yes, increment the pitch by 1 jr nc, .skip2 inc d .skip2 ld hl, wChannelFrequencyLowBytes add hl, bc ld [hl], e call Audio3_7d6bf ret Audio3_7d66c: ld b, $0 ld hl, Unknown_7db9b add hl, bc ld a, [rNR51] or [hl] ld d, a ld a, c cp Ch7 jr z, .sfxNoiseChannel cp Ch4 jr nc, .skip ; if sfx channel ld hl, wChannelSoundIDs + Ch4 add hl, bc ld a, [hl] and a jr nz, .skip .sfxNoiseChannel ld a, [wStereoPanning] ld hl, Unknown_7db9b add hl, bc and [hl] ld d, a ld a, [rNR51] ld hl, Unknown_7db93 add hl, bc and [hl] or d ld d, a .skip ld a, d ld [rNR51], a ret Audio3_7d69d: ld b, $0 ld hl, wChannelNoteDelayCounters add hl, bc ld d, [hl] ld a, c cp Ch2 jr z, .channel3 ; if music channel 3 cp Ch6 jr z, .channel3 ; if sfx channel 3 ld a, d and $3f ld d, a ld hl, wChannelDuties add hl, bc ld a, [hl] or d ld d, a .channel3 ld b, $1 call Audio3_7d8ac ld [hl], d ret Audio3_7d6bf: ld a, c cp Ch2 jr z, .channel3 cp Ch6 jr nz, .notSfxChannel3 ; fall through .channel3 push de ld de, wMusicWaveInstrument cp Ch2 jr z, .musicChannel3 ld de, wSfxWaveInstrument .musicChannel3 ld a, [de] add a ld d, $0 ld e, a ld hl, Audio3_WavePointers add hl, de ld e, [hl] inc hl ld d, [hl] ld hl, $ff30 ld b, $f ld a, $0 ld [rNR30], a .loop ld a, [de] inc de ld [hli], a ld a, b dec b and a jr nz, .loop ld a, $80 ld [rNR30], a pop de .notSfxChannel3 ld a, d or $80 and $c7 ld d, a ld b, $3 call Audio3_7d8ac ld [hl], e inc hl ld [hl], d call Audio3_7d729 ret Audio3_7d707: call Audio3_7d759 jr nc, .asm_7d71f ld d, $0 ld a, [wTempoModifier] add $80 jr nc, .asm_7d716 inc d .asm_7d716 ld [wSfxTempo + 1], a ld a, d ld [wSfxTempo], a jr .asm_7d728 .asm_7d71f xor a ld [wSfxTempo + 1], a ld a, $1 ld [wSfxTempo], a .asm_7d728 ret Audio3_7d729: call Audio3_7d759 jr nc, .asm_7d73a ld a, [wFrequencyModifier] add e jr nc, .asm_7d735 inc d .asm_7d735 dec hl ld e, a ld [hl], e inc hl ld [hl], d .asm_7d73a ret Audio3_7d73b: call Audio3_7d759 jr nc, .asm_7d756 ld hl, wChannelCommandPointers ld e, c ld d, $0 sla e rl d add hl, de ld a, [hl] sub $1 ld [hl], a inc hl ld a, [hl] sbc $0 ld [hl], a scf ret .asm_7d756 scf ccf ret Audio3_7d759: ld a, [wChannelSoundIDs + Ch4] cp $14 jr nc, .asm_7d762 jr .asm_7d768 .asm_7d762 cp $86 jr z, .asm_7d768 jr c, .asm_7d76b .asm_7d768 scf ccf ret .asm_7d76b scf ret Audio3_ApplyPitchBend: ld hl, wChannelFlags1 add hl, bc bit 5, [hl] jp nz, .asm_7d7b4 ld hl, wChannelPitchBendCurrentFrequencyLowBytes add hl, bc ld e, [hl] ld hl, wChannelPitchBendCurrentFrequencyHighBytes add hl, bc ld d, [hl] ld hl, wChannelPitchBendFrequencySteps add hl, bc ld l, [hl] ld h, b add hl, de ld d, h ld e, l ld hl, wChannelPitchBendCurrentFrequencyFractionalPart add hl, bc push hl ld hl, wChannelPitchBendFrequencyStepsFractionalPart add hl, bc ld a, [hl] pop hl add [hl] ld [hl], a ld a, $0 adc e ld e, a ld a, $0 adc d ld d, a ld hl, wChannelPitchBendTargetFrequencyHighBytes add hl, bc ld a, [hl] cp d jp c, .asm_7d7fa jr nz, .asm_7d7e7 ld hl, wChannelPitchBendTargetFrequencyLowBytes add hl, bc ld a, [hl] cp e jp c, .asm_7d7fa jr .asm_7d7e7 .asm_7d7b4 ld hl, wChannelPitchBendCurrentFrequencyLowBytes add hl, bc ld a, [hl] ld hl, wChannelPitchBendCurrentFrequencyHighBytes add hl, bc ld d, [hl] ld hl, wChannelPitchBendFrequencySteps add hl, bc ld e, [hl] sub e ld e, a ld a, d sbc b ld d, a ld hl, wChannelPitchBendFrequencyStepsFractionalPart add hl, bc ld a, [hl] add a ld [hl], a ld a, e sbc b ld e, a ld a, d sbc b ld d, a ld hl, wChannelPitchBendTargetFrequencyHighBytes add hl, bc ld a, d cp [hl] jr c, .asm_7d7fa jr nz, .asm_7d7e7 ld hl, wChannelPitchBendTargetFrequencyLowBytes add hl, bc ld a, e cp [hl] jr c, .asm_7d7fa .asm_7d7e7 ld hl, wChannelPitchBendCurrentFrequencyLowBytes add hl, bc ld [hl], e ld hl, wChannelPitchBendCurrentFrequencyHighBytes add hl, bc ld [hl], d ld b, $3 call Audio3_7d8ac ld a, e ld [hli], a ld [hl], d ret .asm_7d7fa ld hl, wChannelFlags1 add hl, bc res 4, [hl] res 5, [hl] ret Audio3_7d803: ld hl, wChannelPitchBendCurrentFrequencyHighBytes add hl, bc ld [hl], d ld hl, wChannelPitchBendCurrentFrequencyLowBytes add hl, bc ld [hl], e ld hl, wChannelNoteDelayCounters add hl, bc ld a, [hl] ld hl, wChannelPitchBendLengthModifiers add hl, bc sub [hl] jr nc, .asm_7d81b ld a, $1 .asm_7d81b ld [hl], a ld hl, wChannelPitchBendTargetFrequencyLowBytes add hl, bc ld a, e sub [hl] ld e, a ld a, d sbc b ld hl, wChannelPitchBendTargetFrequencyHighBytes add hl, bc sub [hl] jr c, .asm_7d837 ld d, a ld b, $0 ld hl, wChannelFlags1 add hl, bc set 5, [hl] jr .asm_7d85a .asm_7d837 ld hl, wChannelPitchBendCurrentFrequencyHighBytes add hl, bc ld d, [hl] ld hl, wChannelPitchBendCurrentFrequencyLowBytes add hl, bc ld e, [hl] ld hl, wChannelPitchBendTargetFrequencyLowBytes add hl, bc ld a, [hl] sub e ld e, a ld a, d sbc b ld d, a ld hl, wChannelPitchBendTargetFrequencyHighBytes add hl, bc ld a, [hl] sub d ld d, a ld b, $0 ld hl, wChannelFlags1 add hl, bc res 5, [hl] .asm_7d85a ld hl, wChannelPitchBendLengthModifiers add hl, bc .asm_7d85e inc b ld a, e sub [hl] ld e, a jr nc, .asm_7d85e ld a, d and a jr z, .asm_7d86c dec a ld d, a jr .asm_7d85e .asm_7d86c ld a, e add [hl] ld d, b ld b, $0 ld hl, wChannelPitchBendFrequencySteps add hl, bc ld [hl], d ld hl, wChannelPitchBendFrequencyStepsFractionalPart add hl, bc ld [hl], a ld hl, wChannelPitchBendCurrentFrequencyFractionalPart add hl, bc ld [hl], a ret Audio3_ApplyDutyCycle: ld b, $0 ld hl, wChannelDutyCycles add hl, bc ld a, [hl] rlca rlca ld [hl], a and $c0 ld d, a ld b, $1 call Audio3_7d8ac ld a, [hl] and $3f or d ld [hl], a ret Audio3_GetNextMusicByte: ld d, $0 ld a, c add a ld e, a ld hl, wChannelCommandPointers add hl, de ld a, [hli] ld e, a ld a, [hld] ld d, a ld a, [de] ; get next music command inc de ld [hl], e ; store address of next command inc hl ld [hl], d ret Audio3_7d8ac: ld a, c ld hl, Unknown_7db8b add l jr nc, .noCarry inc h .noCarry ld l, a ld a, [hl] add b ld l, a ld h, $ff ret Audio3_7d8bb: ld h, $0 .loop srl a jr nc, .noCarry add hl, de .noCarry sla e rl d and a jr z, .done jr .loop .done ret Audio3_7d8cc: ld h, $0 ld l, a add hl, hl ld d, h ld e, l ld hl, Audio3_Pitches add hl, de ld e, [hl] inc hl ld d, [hl] ld a, b .loop cp $7 jr z, .done sra d rr e inc a jr .loop .done ld a, $8 add d ld d, a ret Audio3_PlaySound:: ld [wSoundID], a cp $ff jp z, Audio3_7daa8 cp $c2 jp z, Audio3_7d9c2 jp c, Audio3_7d9c2 cp $fe jr z, .asm_7d901 jp nc, Audio3_7d9c2 .asm_7d901 xor a ld [wUnusedC000], a ld [wDisableChannelOutputWhenSfxEnds], a ld [wMusicTempo + 1], a ld [wMusicWaveInstrument], a ld [wSfxWaveInstrument], a ld d, $8 ld hl, wChannelReturnAddresses call FillAudioRAM3 ld hl, wChannelCommandPointers call FillAudioRAM3 ld d, $4 ld hl, wChannelSoundIDs call FillAudioRAM3 ld hl, wChannelFlags1 call FillAudioRAM3 ld hl, wChannelDuties call FillAudioRAM3 ld hl, wChannelDutyCycles call FillAudioRAM3 ld hl, wChannelVibratoDelayCounters call FillAudioRAM3 ld hl, wChannelVibratoExtents call FillAudioRAM3 ld hl, wChannelVibratoRates call FillAudioRAM3 ld hl, wChannelFrequencyLowBytes call FillAudioRAM3 ld hl, wChannelVibratoDelayCounterReloadValues call FillAudioRAM3 ld hl, wChannelFlags2 call FillAudioRAM3 ld hl, wChannelPitchBendLengthModifiers call FillAudioRAM3 ld hl, wChannelPitchBendFrequencySteps call FillAudioRAM3 ld hl, wChannelPitchBendFrequencyStepsFractionalPart call FillAudioRAM3 ld hl, wChannelPitchBendCurrentFrequencyFractionalPart call FillAudioRAM3 ld hl, wChannelPitchBendCurrentFrequencyHighBytes call FillAudioRAM3 ld hl, wChannelPitchBendCurrentFrequencyLowBytes call FillAudioRAM3 ld hl, wChannelPitchBendTargetFrequencyHighBytes call FillAudioRAM3 ld hl, wChannelPitchBendTargetFrequencyLowBytes call FillAudioRAM3 ld a, $1 ld hl, wChannelLoopCounters call FillAudioRAM3 ld hl, wChannelNoteDelayCounters call FillAudioRAM3 ld hl, wChannelNoteSpeeds call FillAudioRAM3 ld [wMusicTempo], a ld a, $ff ld [wStereoPanning], a xor a ld [rNR50], a ld a, $8 ld [rNR10], a ld a, $0 ld [rNR51], a xor a ld [rNR30], a ld a, $80 ld [rNR30], a ld a, $77 ld [rNR50], a jp Audio3_7db03 Audio3_7d9c2: ld l, a ld e, a ld h, $0 ld d, h add hl, hl add hl, de ld de, SFX_Headers_3 add hl, de ld a, h ld [wSfxHeaderPointer], a ld a, l ld [wSfxHeaderPointer + 1], a ld a, [hl] and $c0 rlca rlca ld c, a .asm_7d9db ld d, c ld a, c add a add c ld c, a ld b, $0 ld a, [wSfxHeaderPointer] ld h, a ld a, [wSfxHeaderPointer + 1] ld l, a add hl, bc ld c, d ld a, [hl] and $f ld e, a ld d, $0 ld hl, wChannelSoundIDs add hl, de ld a, [hl] and a jr z, .asm_7da17 ld a, e cp $7 jr nz, .asm_7da0e ld a, [wSoundID] cp $14 jr nc, .asm_7da07 ret .asm_7da07 ld a, [hl] cp $14 jr z, .asm_7da17 jr c, .asm_7da17 .asm_7da0e ld a, [wSoundID] cp [hl] jr z, .asm_7da17 jr c, .asm_7da17 ret .asm_7da17 xor a push de ld h, d ld l, e add hl, hl ld d, h ld e, l ld hl, wChannelReturnAddresses add hl, de ld [hli], a ld [hl], a ld hl, wChannelCommandPointers add hl, de ld [hli], a ld [hl], a pop de ld hl, wChannelSoundIDs add hl, de ld [hl], a ld hl, wChannelFlags1 add hl, de ld [hl], a ld hl, wChannelDuties add hl, de ld [hl], a ld hl, wChannelDutyCycles add hl, de ld [hl], a ld hl, wChannelVibratoDelayCounters add hl, de ld [hl], a ld hl, wChannelVibratoExtents add hl, de ld [hl], a ld hl, wChannelVibratoRates add hl, de ld [hl], a ld hl, wChannelFrequencyLowBytes add hl, de ld [hl], a ld hl, wChannelVibratoDelayCounterReloadValues add hl, de ld [hl], a ld hl, wChannelPitchBendLengthModifiers add hl, de ld [hl], a ld hl, wChannelPitchBendFrequencySteps add hl, de ld [hl], a ld hl, wChannelPitchBendFrequencyStepsFractionalPart add hl, de ld [hl], a ld hl, wChannelPitchBendCurrentFrequencyFractionalPart add hl, de ld [hl], a ld hl, wChannelPitchBendCurrentFrequencyHighBytes add hl, de ld [hl], a ld hl, wChannelPitchBendCurrentFrequencyLowBytes add hl, de ld [hl], a ld hl, wChannelPitchBendTargetFrequencyHighBytes add hl, de ld [hl], a ld hl, wChannelPitchBendTargetFrequencyLowBytes add hl, de ld [hl], a ld hl, wChannelFlags2 add hl, de ld [hl], a ld a, $1 ld hl, wChannelLoopCounters add hl, de ld [hl], a ld hl, wChannelNoteDelayCounters add hl, de ld [hl], a ld hl, wChannelNoteSpeeds add hl, de ld [hl], a ld a, e cp $4 jr nz, .asm_7da9f ld a, $8 ld [rNR10], a .asm_7da9f ld a, c and a jp z, Audio3_7db03 dec c jp .asm_7d9db Audio3_7daa8: ld a, $80 ld [rNR52], a ld [rNR30], a xor a ld [rNR51], a ld [rNR32], a ld a, $8 ld [rNR10], a ld [rNR12], a ld [rNR22], a ld [rNR42], a ld a, $40 ld [rNR14], a ld [rNR24], a ld [rNR44], a ld a, $77 ld [rNR50], a xor a ld [wUnusedC000], a ld [wDisableChannelOutputWhenSfxEnds], a ld [wMuteAudioAndPauseMusic], a ld [wMusicTempo + 1], a ld [wSfxTempo + 1], a ld [wMusicWaveInstrument], a ld [wSfxWaveInstrument], a ld d, $a0 ld hl, wChannelCommandPointers call FillAudioRAM3 ld a, $1 ld d, $18 ld hl, wChannelNoteDelayCounters call FillAudioRAM3 ld [wMusicTempo], a ld [wSfxTempo], a ld a, $ff ld [wStereoPanning], a ret ; fills d bytes at hl with a FillAudioRAM3: ld b, d .loop ld [hli], a dec b jr nz, .loop ret Audio3_7db03: ld a, [wSoundID] ld l, a ld e, a ld h, $0 ld d, h add hl, hl add hl, de ld de, SFX_Headers_3 add hl, de ld e, l ld d, h ld hl, wChannelCommandPointers ld a, [de] ; get channel number ld b, a rlca rlca and $3 ld c, a ld a, b and $f ld b, c inc b inc de ld c, $0 .asm_7db25 cp c jr z, .asm_7db2d inc c inc hl inc hl jr .asm_7db25 .asm_7db2d push hl push bc push af ld b, $0 ld c, a ld hl, wChannelSoundIDs add hl, bc ld a, [wSoundID] ld [hl], a pop af cp $3 jr c, .asm_7db46 ld hl, wChannelFlags1 add hl, bc set 2, [hl] .asm_7db46 pop bc pop hl ld a, [de] ; get channel pointer ld [hli], a inc de ld a, [de] ld [hli], a inc de inc c dec b ld a, b and a ld a, [de] inc de jr nz, .asm_7db25 ld a, [wSoundID] cp $14 jr nc, .asm_7db5f jr .asm_7db89 .asm_7db5f ld a, [wSoundID] cp $86 jr z, .asm_7db89 jr c, .asm_7db6a jr .asm_7db89 .asm_7db6a ld hl, wChannelSoundIDs + Ch4 ld [hli], a ld [hli], a ld [hli], a ld [hl], a ld hl, wChannelCommandPointers + Ch6 * 2 ; sfx noise channel pointer ld de, Noise3_endchannel ld [hl], e inc hl ld [hl], d ; overwrite pointer to point to endchannel ld a, [wSavedVolume] and a jr nz, .asm_7db89 ld a, [rNR50] ld [wSavedVolume], a ld a, $77 ld [rNR50], a .asm_7db89 ret Noise3_endchannel: endchannel Unknown_7db8b: db $10, $15, $1A, $1F ; channels 0-3 db $10, $15, $1A, $1F ; channels 4-7 Unknown_7db93: db $EE, $DD, $BB, $77 ; channels 0-3 db $EE, $DD, $BB, $77 ; channels 4-7 Unknown_7db9b: db $11, $22, $44, $88 ; channels 0-3 db $11, $22, $44, $88 ; channels 4-7 Audio3_Pitches: dw $F82C ; C_ dw $F89D ; C# dw $F907 ; D_ dw $F96B ; D# dw $F9CA ; E_ dw $FA23 ; F_ dw $FA77 ; F# dw $FAC7 ; G_ dw $FB12 ; G# dw $FB58 ; A_ dw $FB9B ; A# dw $FBDA ; B_