ref: 80f7845a0771c1666288f22dba2c3c8e6a308f26
dir: /audio/engine_3.asm/
; The third of three duplicated sound engines. Func_7d177:: ; 7d177 (1f:5177) ld c, CH0 .loop ld b, $0 ld hl, wc026 add hl, bc ld a, [hl] and a jr z, .nextChannel ld a, c cp CH4 jr nc, .applyAffects ; if sfx channel ld a, [wc002] and a jr z, .applyAffects bit 7, a jr nz, .nextChannel set 7, a ld [wc002], a xor a ld [$ff25], a ld [$ff1a], a ld a, $80 ld [$ff1a], a jr .nextChannel .applyAffects call Music1f_Music2_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 wc02e: ; 1: call has been used ; 3: a toggle used only by this routine for vibrato ; 4: pitchbend flag ; 6: dutycycle flag Music1f_Music2_ApplyMusicAffects: ; 7d1ac (1f:51ac) ld b, $0 ld hl, wc0b6 ; delay until next note add hl, bc ld a, [hl] cp $1 ; if delay is 1, play next note jp z, Music1f_Music2_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, wc02a add hl, bc ld a, [hl] and a jr z, .startChecks ret .startChecks ld hl, wc02e add hl, bc bit 6, [hl] ; dutycycle jr z, .checkForExecuteMusic call Music1f_ApplyDutyCycle .checkForExecuteMusic ld b, $0 ld hl, wc036 add hl, bc bit 0, [hl] jr nz, .checkForPitchBend ld hl, wc02e add hl, bc bit 2, [hl] jr nz, .disablePitchBendVibrato .checkForPitchBend ld hl, wc02e add hl, bc bit 4, [hl] ; pitchbend jr z, .checkVibratoDelay jp Music1f_ApplyPitchBend .checkVibratoDelay ld hl, wc04e ; 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, wc056 ; vibrato rate add hl, bc ld a, [hl] and a jr nz, .vibrato ret ; no vibrato .vibrato ld d, a ld hl, wc05e 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, wc066 add hl, bc ld e, [hl] ; get note pitch ld hl, wc02e 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 Func_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 Music1f_Music2_PlayNextNote: ; 7d244 (1f:5244) ld hl, wc06e add hl, bc ld a, [hl] ld hl, wc04e add hl, bc ld [hl], a ld hl, wc02e add hl, bc res 4, [hl] res 5, [hl] call Music1f_endchannel ret Music1f_endchannel: ; 7d25a (1f:525a) call Music1f_GetNextMusicByte ld d, a cp $ff ; is this command an endchannel? jp nz, Music1f_callchannel ; no ld b, $0 ; yes ld hl, wc02e 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, wc036 add hl, bc res 0, [hl] cp CH6 jr nz, .notSfxChannel3 ld a, $0 ld [$ff1a], a ld a, $80 ld [$ff1a], a .notSfxChannel3 jr nz, .asm_7d296 ld a, [wc003] and a jr z, .asm_7d296 xor a ld [wc003], a jr .asm_7d2b3 .asm_7d296 jr .asm_7d2bc .returnFromCall res 1, [hl] ld d, $0 ld a, c add a ld e, a ld hl, wc006 add hl, de push hl ; store current channel address ld hl, wc016 add hl, de ld e, l ld d, h pop hl ld a, [de] ld [hli], a inc de ld a, [de] ld [hl], a ; loads channel address to return to jp Music1f_endchannel .asm_7d2b3 ld hl, Unknown_7db93 add hl, bc ld a, [$ff25] and [hl] ld [$ff25], a .asm_7d2bc ld a, [wc02a] cp $14 jr nc, .asm_7d2c5 jr .asm_7d2e2 .asm_7d2c5 ld a, [wc02a] cp $86 jr z, .asm_7d2e2 jr c, .asm_7d2d0 jr .asm_7d2e2 .asm_7d2d0 ld a, c cp CH4 jr z, .asm_7d2d9 call Func_7d73b ret c .asm_7d2d9 ld a, [wc005] ld [$ff24], a xor a ld [wc005], a .asm_7d2e2 ld hl, wc026 add hl, bc ld [hl], b ret Music1f_callchannel: ; 7d2e8 (1f:52e8) cp $fd ; is this command a callchannel? jp nz, Music1f_loopchannel ; no call Music1f_GetNextMusicByte ; yes push af call Music1f_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, wc006 add hl, de push hl ld hl, wc016 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, wc02e add hl, bc set 1, [hl] ; set the call flag jp Music1f_endchannel Music1f_loopchannel: ; 7d31d (1f:531d) cp $fe ; is this command a loopchannel? jp nz, Music1f_notetype ; no call Music1f_GetNextMusicByte ; yes ld e, a and a jr z, .infiniteLoop ld b, $0 ld hl, wc0be add hl, bc ld a, [hl] cp e jr nz, .loopAgain ld a, $1 ; if no more loops to make ld [hl], a call Music1f_GetNextMusicByte ; skip pointer call Music1f_GetNextMusicByte jp Music1f_endchannel .loopAgain ; inc loop count inc a ld [hl], a ; fall through .infiniteLoop ; overwrite current address with pointer call Music1f_GetNextMusicByte push af call Music1f_GetNextMusicByte ld b, a ld d, $0 ld a, c add a ld e, a ld hl, wc006 add hl, de pop af ld [hli], a ld [hl], b jp Music1f_endchannel Music1f_notetype: ; 7d358 (1f:5358) and $f0 cp $d0 ; is this command a notetype? jp nz, Music1f_togglecall ; no ld a, d ; yes and $f ld b, $0 ld hl, wc0c6 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 Music1f_GetNextMusicByte ld d, a ld a, c cp CH2 jr z, .musicChannel3 cp CH6 jr nz, .notChannel3 ld hl, wc0e7 jr .sfxChannel3 .musicChannel3 ld hl, wc0e6 .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, wc0de add hl, bc ld [hl], d .noiseChannel jp Music1f_endchannel Music1f_togglecall: ; 7d397 (1f:5397) ld a, d cp $e8 ; is this command an togglecall? jr nz, Music1f_vibrato ; no ld b, $0 ; yes ld hl, wc02e add hl, bc ld a, [hl] xor $1 ld [hl], a ; flip bit 0 of wc02e (toggle returning from call) jp Music1f_endchannel Music1f_vibrato: ; 7d3a9 (1f:53a9) cp $ea ; is this command a vibrato? jr nz, Music1f_pitchbend ; no call Music1f_GetNextMusicByte ; yes ld b, $0 ld hl, wc04e add hl, bc ld [hl], a ; store delay ld hl, wc06e add hl, bc ld [hl], a ; store delay call Music1f_GetNextMusicByte ld d, a and $f0 swap a ld b, $0 ld hl, wc056 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, wc05e add hl, bc swap a or d ld [hl], a ; store depth as both high and low nibbles jp Music1f_endchannel Music1f_pitchbend: ; 7d3e1 (1f:53e1) cp $eb ; is this command a pitchbend? jr nz, Music1f_duty ; no call Music1f_GetNextMusicByte ; yes ld b, $0 ld hl, wc076 add hl, bc ld [hl], a ; store first param call Music1f_GetNextMusicByte ld d, a and $f0 swap a ld b, a ld a, d and $f call Func_7d8cc ld b, $0 ld hl, wc0a6 add hl, bc ld [hl], d ; store unknown part of second param ld hl, wc0ae add hl, bc ld [hl], e ; store unknown part of second param ld b, $0 ld hl, wc02e add hl, bc set 4, [hl] ; set pitchbend flag call Music1f_GetNextMusicByte ld d, a jp Music1f_notelength Music1f_duty: ; 7d419 (1f:5419) cp $ec ; is this command a duty? jr nz, Music1f_tempo ; no call Music1f_GetNextMusicByte ; yes rrca rrca and $c0 ld b, $0 ld hl, wc03e add hl, bc ld [hl], a ; store duty jp Music1f_endchannel Music1f_tempo: ; 7d42e (1f:542e) cp $ed ; is this command a tempo? jr nz, Music1f_unknownmusic0xee ; no ld a, c ; yes cp CH4 jr nc, .sfxChannel call Music1f_GetNextMusicByte ld [wc0e8], a ; store first param call Music1f_GetNextMusicByte ld [wc0e9], a ; store second param xor a ld [wc0ce], a ; clear RAM ld [wc0cf], a ld [wc0d0], a ld [wc0d1], a jr .musicChannelDone .sfxChannel call Music1f_GetNextMusicByte ld [wc0ea], a ; store first param call Music1f_GetNextMusicByte ld [wc0eb], a ; store second param xor a ld [wc0d2], a ; clear RAM ld [wc0d3], a ld [wc0d4], a ld [wc0d5], a .musicChannelDone jp Music1f_endchannel Music1f_unknownmusic0xee: ; 7d46e (1f:546e) cp $ee ; is this command an unknownmusic0xee? jr nz, Music1f_unknownmusic0xef ; no call Music1f_GetNextMusicByte ; yes ld [wc004], a ; store first param jp Music1f_endchannel ; this appears to never be used Music1f_unknownmusic0xef: ; 7d47b (1f:547b) cp $ef ; is this command an unknownmusic0xef? jr nz, Music1f_dutycycle ; no call Music1f_GetNextMusicByte ; yes push bc call Func_7d8ea pop bc ld a, [wc003] and a jr nz, .skip ld a, [wc02d] ld [wc003], a xor a ld [wc02d], a .skip jp Music1f_endchannel Music1f_dutycycle: ; 7d49a (1f:549a) cp $fc ; is this command a dutycycle? jr nz, Music1f_stereopanning ; no call Music1f_GetNextMusicByte ; yes ld b, $0 ld hl, wc046 add hl, bc ld [hl], a ; store full cycle and $c0 ld hl, wc03e add hl, bc ld [hl], a ; store first duty ld hl, wc02e add hl, bc set 6, [hl] ; set duty flag jp Music1f_endchannel Music1f_stereopanning: ; 7d4b8 (1f:54b8) cp $f0 ; is this command a stereopanning? jr nz, Music1f_executemusic ; no call Music1f_GetNextMusicByte ; yes ld [$ff24], a ; store stereopanning jp Music1f_endchannel Music1f_executemusic: ; 7d4c4 (1f:54c4) cp $f8 ; is this command an executemusic? jr nz, Music1f_octave ; no ld b, $0 ; yes ld hl, wc036 add hl, bc set 0, [hl] jp Music1f_endchannel Music1f_octave: ; 7d4d3 (1f:54d3) and $f0 cp $e0 ; is this command an octave? jr nz, Music1f_unknownsfx0x20 ; no ld hl, wc0d6 ; yes ld b, $0 add hl, bc ld a, d and $f ld [hl], a ; store low nibble as octave jp Music1f_endchannel Music1f_unknownsfx0x20: ; 7d4e6 (1f:54e6) cp $20 ; is this command an unknownsfx0x20? jr nz, Music1f_unknownsfx0x10 ; no ld a, c cp CH3 ; is this a noise or sfx channel? jr c, Music1f_unknownsfx0x10 ; no ld b, $0 ld hl, wc036 add hl, bc bit 0, [hl] jr nz, Music1f_unknownsfx0x10 ; no call Music1f_notelength ; yes ld d, a ld b, $0 ld hl, wc03e add hl, bc ld a, [hl] or d ld d, a ld b, $1 call Func_7d8ac ld [hl], d call Music1f_GetNextMusicByte ld d, a ld b, $2 call Func_7d8ac ld [hl], d call Music1f_GetNextMusicByte ld e, a ld a, c cp CH7 ld a, $0 jr z, .sfxNoiseChannel ; only two params for noise channel push de call Music1f_GetNextMusicByte pop de .sfxNoiseChannel ld d, a push de call Func_7d69d call Func_7d66c pop de call Func_7d6bf ret Music1f_unknownsfx0x10 ; 7d533 (1f:5533) ld a, c cp CH4 jr c, Music1f_note ; if not a sfx ld a, d cp $10 ; is this command an unknownsfx0x10? jr nz, Music1f_note ; no ld b, $0 ld hl, wc036 add hl, bc bit 0, [hl] jr nz, Music1f_note ; no call Music1f_GetNextMusicByte ; yes ld [$ff10], a jp Music1f_endchannel Music1f_note: ; 7d54f (1f:554f) ld a, c cp CH3 jr nz, Music1f_notelength ; if not noise channel ld a, d and $f0 cp $b0 ; is this command a dnote? jr z, Music1f_dnote ; yes jr nc, Music1f_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 Music1f_dnote: ; 7d569 (1f:5569) ld a, d and $f push af push bc call Music1f_GetNextMusicByte ; get dnote instrument asm_7d571 ld d, a ld a, [wc003] and a jr nz, .asm_7d57c ld a, d call Func_7d8ea .asm_7d57c pop bc pop de Music1f_notelength: ; 7d57e (1f:557e) 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, wc0c6 add hl, bc ld a, [hl] ld l, b call Func_7d8bb ld a, c cp CH4 jr nc, .sfxChannel ld a, [wc0e8] ld d, a ld a, [wc0e9] ld e, a jr .skip .sfxChannel ld d, $1 ld e, $0 cp CH7 jr z, .skip ; if noise channel call Func_7d707 ld a, [wc0ea] ld d, a ld a, [wc0eb] ld e, a .skip ld a, l ld b, $0 ld hl, wc0ce add hl, bc ld l, [hl] call Func_7d8bb ld e, l ld d, h ld hl, wc0ce add hl, bc ld [hl], e ld a, d ld hl, wc0b6 add hl, bc ld [hl], a ld hl, wc036 add hl, bc bit 0, [hl] jr nz, Music1f_notepitch ld hl, wc02e add hl, bc bit 2, [hl] jr z, Music1f_notepitch pop hl ret Music1f_notepitch: ; 7d5dc (1f:55dc) pop af and $f0 cp $c0 ; compare to rest jr nz, .notRest ld a, c cp CH4 jr nc, .sfxChannel ld hl, wc02a 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, $0 ld hl, Unknown_7db93 add hl, bc ld a, [$ff25] and [hl] ld [$ff25], a jr .quit .notSfxChannel3 ld b, $2 call Func_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, wc0d6 add hl, bc ld b, [hl] call Func_7d8cc ld b, $0 ld hl, wc02e add hl, bc bit 4, [hl] jr z, .asm_7d62c call Func_7d803 .asm_7d62c push de ld a, c cp CH4 jr nc, .skip ; if sfx Channel ld hl, wc02a 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, wc0de add hl, bc ld d, [hl] ld b, $2 call Func_7d8ac ld [hl], d call Func_7d69d call Func_7d66c pop de ld b, $0 ld hl, wc02e add hl, bc bit 0, [hl] jr z, .asm_7d663 inc e jr nc, .asm_7d663 inc d .asm_7d663 ld hl, wc066 add hl, bc ld [hl], e call Func_7d6bf ret Func_7d66c: ; 7d66c (1f:566c) ld b, $0 ld hl, Unknown_7db9b add hl, bc ld a, [$ff25] or [hl] ld d, a ld a, c cp CH7 jr z, .sfxNoiseChannel cp CH4 jr nc, .skip ; if sfx channel ld hl, wc02a add hl, bc ld a, [hl] and a jr nz, .skip .sfxNoiseChannel ld a, [wc004] ld hl, Unknown_7db9b add hl, bc and [hl] ld d, a ld a, [$ff25] ld hl, Unknown_7db93 add hl, bc and [hl] or d ld d, a .skip ld a, d ld [$ff25], a ret Func_7d69d: ; 7d69d (1f:569d) ld b, $0 ld hl, wc0b6 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, wc03e add hl, bc ld a, [hl] or d ld d, a .channel3 ld b, $1 call Func_7d8ac ld [hl], d ret Func_7d6bf: ; 7d6bf (1f:56bf) ld a, c cp CH2 jr z, .channel3 cp CH6 jr nz, .notSfxChannel3 ; fall through .channel3 push de ld de, wc0e6 cp CH2 jr z, .musicChannel3 ld de, wc0e7 .musicChannel3 ld a, [de] add a ld d, $0 ld e, a ld hl, Music1f_Channel3DutyPointers add hl, de ld e, [hl] inc hl ld d, [hl] ld hl, $ff30 ld b, $f ld a, $0 ld [$ff1a], a .loop ld a, [de] inc de ld [hli], a ld a, b dec b and a jr nz, .loop ld a, $80 ld [$ff1a], a pop de .notSfxChannel3 ld a, d or $80 and $c7 ld d, a ld b, $3 call Func_7d8ac ld [hl], e inc hl ld [hl], d call Func_7d729 ret Func_7d707: ; 7d707 (1f:5707) call Func_7d759 jr nc, .asm_7d71f ld d, $0 ld a, [wc0f2] add $80 jr nc, .asm_7d716 inc d .asm_7d716 ld [wc0eb], a ld a, d ld [wc0ea], a jr .asm_7d728 .asm_7d71f xor a ld [wc0eb], a ld a, $1 ld [wc0ea], a .asm_7d728 ret Func_7d729: ; 7d729 (1f:5729) call Func_7d759 jr nc, .asm_7d73a ld a, [wc0f1] 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 Func_7d73b: ; 7d73b (1f:573b) call Func_7d759 jr nc, .asm_7d756 ld hl, wc006 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 Func_7d759: ; 7d759 (1f:5759) ld a, [wc02a] 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 Music1f_ApplyPitchBend: ; 7d76d (1f:576d) ld hl, wc02e add hl, bc bit 5, [hl] jp nz, .asm_7d7b4 ld hl, wc09e add hl, bc ld e, [hl] ld hl, wc096 add hl, bc ld d, [hl] ld hl, wc07e add hl, bc ld l, [hl] ld h, b add hl, de ld d, h ld e, l ld hl, wc08e add hl, bc push hl ld hl, wc086 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, wc0a6 add hl, bc ld a, [hl] cp d jp c, .asm_7d7fa jr nz, .asm_7d7e7 ld hl, wc0ae add hl, bc ld a, [hl] cp e jp c, .asm_7d7fa jr .asm_7d7e7 .asm_7d7b4 ld hl, wc09e add hl, bc ld a, [hl] ld hl, wc096 add hl, bc ld d, [hl] ld hl, wc07e add hl, bc ld e, [hl] sub e ld e, a ld a, d sbc b ld d, a ld hl, wc086 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, wc0a6 add hl, bc ld a, d cp [hl] jr c, .asm_7d7fa jr nz, .asm_7d7e7 ld hl, wc0ae add hl, bc ld a, e cp [hl] jr c, .asm_7d7fa .asm_7d7e7 ld hl, wc09e add hl, bc ld [hl], e ld hl, wc096 add hl, bc ld [hl], d ld b, $3 call Func_7d8ac ld a, e ld [hli], a ld [hl], d ret .asm_7d7fa ld hl, wc02e add hl, bc res 4, [hl] res 5, [hl] ret Func_7d803: ; 7d803 (1f:5803) ld hl, wc096 add hl, bc ld [hl], d ld hl, wc09e add hl, bc ld [hl], e ld hl, wc0b6 add hl, bc ld a, [hl] ld hl, wc076 add hl, bc sub [hl] jr nc, .asm_7d81b ld a, $1 .asm_7d81b ld [hl], a ld hl, wc0ae add hl, bc ld a, e sub [hl] ld e, a ld a, d sbc b ld hl, wc0a6 add hl, bc sub [hl] jr c, .asm_7d837 ld d, a ld b, $0 ld hl, wc02e add hl, bc set 5, [hl] jr .asm_7d85a .asm_7d837 ld hl, wc096 add hl, bc ld d, [hl] ld hl, wc09e add hl, bc ld e, [hl] ld hl, wc0ae add hl, bc ld a, [hl] sub e ld e, a ld a, d sbc b ld d, a ld hl, wc0a6 add hl, bc ld a, [hl] sub d ld d, a ld b, $0 ld hl, wc02e add hl, bc res 5, [hl] .asm_7d85a ld hl, wc076 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, wc07e add hl, bc ld [hl], d ld hl, wc086 add hl, bc ld [hl], a ld hl, wc08e add hl, bc ld [hl], a ret Music1f_ApplyDutyCycle: ; 7d881 (1f:5881) ld b, $0 ld hl, wc046 add hl, bc ld a, [hl] rlca rlca ld [hl], a and $c0 ld d, a ld b, $1 call Func_7d8ac ld a, [hl] and $3f or d ld [hl], a ret Music1f_GetNextMusicByte: ; 7d899 (1f:5899) ld d, $0 ld a, c add a ld e, a ld hl, wc006 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 Func_7d8ac: ; 7d8ac (1f:58ac) 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 Func_7d8bb: ; 7d8bb (1f:58bb) 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 Func_7d8cc: ; 7d8cc (1f:58cc) ld h, $0 ld l, a add hl, hl ld d, h ld e, l ld hl, Unknown_7dba3 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 Func_7d8ea:: ; 7d8ea (1f:58ea) ld [wc001], a cp $ff jp z, Func_7daa8 cp $c2 jp z, Func_7d9c2 jp c, Func_7d9c2 cp $fe jr z, .asm_7d901 jp nc, Func_7d9c2 .asm_7d901 xor a ld [wc000], a ld [wc003], a ld [wc0e9], a ld [wc0e6], a ld [wc0e7], a ld d, $8 ld hl, wc016 call FillMusicRAM1f ld hl, wc006 call FillMusicRAM1f ld d, $4 ld hl, wc026 call FillMusicRAM1f ld hl, wc02e call FillMusicRAM1f ld hl, wc03e call FillMusicRAM1f ld hl, wc046 call FillMusicRAM1f ld hl, wc04e call FillMusicRAM1f ld hl, wc056 call FillMusicRAM1f ld hl, wc05e call FillMusicRAM1f ld hl, wc066 call FillMusicRAM1f ld hl, wc06e call FillMusicRAM1f ld hl, wc036 call FillMusicRAM1f ld hl, wc076 call FillMusicRAM1f ld hl, wc07e call FillMusicRAM1f ld hl, wc086 call FillMusicRAM1f ld hl, wc08e call FillMusicRAM1f ld hl, wc096 call FillMusicRAM1f ld hl, wc09e call FillMusicRAM1f ld hl, wc0a6 call FillMusicRAM1f ld hl, wc0ae call FillMusicRAM1f ld a, $1 ld hl, wc0be call FillMusicRAM1f ld hl, wc0b6 call FillMusicRAM1f ld hl, wc0c6 call FillMusicRAM1f ld [wc0e8], a ld a, $ff ld [wc004], a xor a ld [$ff24], a ld a, $8 ld [$ff10], a ld a, $0 ld [$ff25], a xor a ld [$ff1a], a ld a, $80 ld [$ff1a], a ld a, $77 ld [$ff24], a jp Func_7db03 Func_7d9c2: ; 7d9c2 (1f:59c2) ld l, a ld e, a ld h, $0 ld d, h add hl, hl add hl, de ld de, SFX_Headers_1f add hl, de ld a, h ld [wc0ec], a ld a, l ld [wc0ed], 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, [wc0ec] ld h, a ld a, [wc0ed] ld l, a add hl, bc ld c, d ld a, [hl] and $f ld e, a ld d, $0 ld hl, wc026 add hl, de ld a, [hl] and a jr z, .asm_7da17 ld a, e cp $7 jr nz, .asm_7da0e ld a, [wc001] 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, [wc001] 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, wc016 add hl, de ld [hli], a ld [hl], a ld hl, wc006 add hl, de ld [hli], a ld [hl], a pop de ld hl, wc026 add hl, de ld [hl], a ld hl, wc02e add hl, de ld [hl], a ld hl, wc03e add hl, de ld [hl], a ld hl, wc046 add hl, de ld [hl], a ld hl, wc04e add hl, de ld [hl], a ld hl, wc056 add hl, de ld [hl], a ld hl, wc05e add hl, de ld [hl], a ld hl, wc066 add hl, de ld [hl], a ld hl, wc06e add hl, de ld [hl], a ld hl, wc076 add hl, de ld [hl], a ld hl, wc07e add hl, de ld [hl], a ld hl, wc086 add hl, de ld [hl], a ld hl, wc08e add hl, de ld [hl], a ld hl, wc096 add hl, de ld [hl], a ld hl, wc09e add hl, de ld [hl], a ld hl, wc0a6 add hl, de ld [hl], a ld hl, wc0ae add hl, de ld [hl], a ld hl, wc036 add hl, de ld [hl], a ld a, $1 ld hl, wc0be add hl, de ld [hl], a ld hl, wc0b6 add hl, de ld [hl], a ld hl, wc0c6 add hl, de ld [hl], a ld a, e cp $4 jr nz, .asm_7da9f ld a, $8 ld [$ff10], a .asm_7da9f ld a, c and a jp z, Func_7db03 dec c jp .asm_7d9db Func_7daa8: ; 7daa8 (1f:5aa8) ld a, $80 ld [$ff26], a ld [$ff1a], a xor a ld [$ff25], a ld [$ff1c], a ld a, $8 ld [$ff10], a ld [$ff12], a ld [$ff17], a ld [$ff21], a ld a, $40 ld [$ff14], a ld [$ff19], a ld [$ff23], a ld a, $77 ld [$ff24], a xor a ld [wc000], a ld [wc003], a ld [wc002], a ld [wc0e9], a ld [wc0eb], a ld [wc0e6], a ld [wc0e7], a ld d, $a0 ld hl, wc006 call FillMusicRAM1f ld a, $1 ld d, $18 ld hl, wc0b6 call FillMusicRAM1f ld [wc0e8], a ld [wc0ea], a ld a, $ff ld [wc004], a ret ; fills d bytes at hl with a FillMusicRAM1f: ; 7dafd (1f:5afd) ld b, d .loop ld [hli], a dec b jr nz, .loop ret Func_7db03: ; 7db03 (1f:5b03) ld a, [wc001] ld l, a ld e, a ld h, $0 ld d, h add hl, hl add hl, de ld de, SFX_Headers_1f add hl, de ld e, l ld d, h ld hl, wc006 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, wc026 add hl, bc ld a, [wc001] ld [hl], a pop af cp $3 jr c, .asm_7db46 ld hl, wc02e 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, [wc001] cp $14 jr nc, .asm_7db5f jr .asm_7db89 .asm_7db5f ld a, [wc001] cp $86 jr z, .asm_7db89 jr c, .asm_7db6a jr .asm_7db89 .asm_7db6a ld hl, wc02a ld [hli], a ld [hli], a ld [hli], a ld [hl], a ld hl, wc012 ; sfx noise channel pointer ld de, Noise1f_endchannel ld [hl], e inc hl ld [hl], d ; overwrite pointer to point to endchannel ld a, [wc005] and a jr nz, .asm_7db89 ld a, [$ff24] ld [wc005], a ld a, $77 ld [$ff24], a .asm_7db89 ret Noise1f_endchannel: ; 7db8a (1f:5b8a) endchannel Unknown_7db8b: ; 7db8b (1f:5b8b) db $10, $15, $1A, $1F ; channels 0-3 db $10, $15, $1A, $1F ; channels 4-7 Unknown_7db93: ; 7db93 (1f:5b93) db $EE, $DD, $BB, $77 ; channels 0-3 db $EE, $DD, $BB, $77 ; channels 4-7 Unknown_7db9b: ; 7db9b (1f:5b9b) db $11, $22, $44, $88 ; channels 0-3 db $11, $22, $44, $88 ; channels 4-7 Unknown_7dba3: ; 7dba3 (1f:5ba3) dw $F82C dw $F89D dw $F907 dw $F96B dw $F9CA dw $FA23 dw $FA77 dw $FAC7 dw $FB12 dw $FB58 dw $FB9B dw $FBDA