diff options
Diffstat (limited to 'audio/engine_2.asm')
| -rw-r--r-- | audio/engine_2.asm | 1733 |
1 files changed, 1733 insertions, 0 deletions
diff --git a/audio/engine_2.asm b/audio/engine_2.asm new file mode 100644 index 00000000..deb65357 --- /dev/null +++ b/audio/engine_2.asm @@ -0,0 +1,1733 @@ +; The second of three duplicated sound engines. + +Func_21879: ; 21879 (8:5879) + ld c, CH0 +.loop + ld b, $0 + ld hl, $c026 + add hl, bc + ld a, [hl] + and a + jr z, .nextChannel + ld a, c + cp CH4 + jr nc, .applyAffects ; if sfx channel + ld a, [$c002] + and a + jr z, .applyAffects + bit 7, a + jr nz, .nextChannel + set 7, a + ld [$c002], a + xor a + ld [$FF00+$25], a + ld [$FF00+$1a], a + ld a, $80 + ld [$FF00+$1a], a + jr .nextChannel +.applyAffects + call Music8_ApplyMusicAffects +.nextChannel + ld a, c + inc c + 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 $c02e: +; 1: call has been used +; 3: a toggle used only by this routine for vibrato +; 4: pitchbend flag +; 6: dutycycle flag +Music8_ApplyMusicAffects: ; 218ae (8:58ae) + ld b, $0 + ld hl, $c0b6 ; delay unitl next note + add hl, bc + ld a, [hl] + cp $1 ; if the delay is 1, play next note + jp z, Music8_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, $c02a + add hl, bc + ld a, [hl] + and a + jr z, .startChecks + ret +.startChecks + ld hl, $c02e + add hl, bc + bit 6, [hl] ; dutycycle + jr z, .checkForExecuteMusic + call Music8_ApplyDutyCycle +.checkForExecuteMusic + ld b, $0 + ld hl, $c036 + add hl, bc + bit 0, [hl] + jr nz, .checkForPitchBend + ld hl, $c02e + add hl, bc + bit 2, [hl] + jr nz, .disablePitchBendVibrato +.checkForPitchBend + ld hl, $c02e + add hl, bc + bit 4, [hl] ; pitchbend + jr z, .checkVibratoDelay + jp Music8_ApplyPitchBend +.checkVibratoDelay + ld hl, $c04e ; 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, $c056 ; vibrato rate + add hl, bc + ld a, [hl] + and a + jr nz, .vibrato + ret ; no vibrato +.vibrato + ld d, a + ld hl, $c05e + 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, $c066 + add hl, bc + ld e, [hl] ; get note pitch + ld hl, $c02e + 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_21ff7 + 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 +Music8_PlayNextNote: ; 21946 (8:5946) + ld hl, $c06e + add hl, bc + ld a, [hl] + ld hl, $c04e + add hl, bc + ld [hl], a + ld hl, $c02e + add hl, bc + res 4, [hl] + res 5, [hl] + ld a, c + cp CH4 + jr nz, .beginChecks + ld a, [$d083] + bit 7, a + ret nz +.beginChecks + call Music8_endchannel + ret + +Music8_endchannel: ; 21967 (8:5967) + call Music8_GetNextMusicByte + ld d, a + cp $ff ; is this command an endchannel? + jp nz, Music8_callchannel ; no + ld b, $0 ; yes + ld hl, $c02e + add hl, bc + bit 1, [hl] + jr nz, .returnFromCall + ld a, c + cp CH3 + jr nc, .noiseOrSfxChannel + jr .asm_219c0 +.noiseOrSfxChannel + res 2, [hl] + ld hl, $c036 + add hl, bc + res 0, [hl] + cp CH6 + jr nz, .notSfxChannel3 + ld a, $0 + ld [$FF00+$1a], a + ld a, $80 + ld [$FF00+$1a], a +.notSfxChannel3 + jr nz, .asm_219a3 + ld a, [$c003] + and a + jr z, .asm_219a3 + xor a + ld [$c003], a + jr .asm_219c0 +.asm_219a3 + jr .asm_219c9 +.returnFromCall + res 1, [hl] + ld d, $0 + ld a, c + add a + ld e, a + ld hl, $c006 + add hl, de + push hl ; store current channel address + ld hl, $c016 + add hl, de + ld e, l + ld d, h + pop hl + ld a, [de] + ld [hli], a + inc de + ld a, [de] + ld [hl], a ; loads channel address to return to + jp Music8_endchannel +.asm_219c0 + ld hl, Unknown_222de + add hl, bc + ld a, [$FF00+$25] + and [hl] + ld [$FF00+$25], a +.asm_219c9 + ld a, [$c02a] + cp $14 + jr nc, .asm_219d2 + jr .asm_219ef +.asm_219d2 + ld a, [$c02a] + cp $86 + jr z, .asm_219ef + jr c, .asm_219dd + jr .asm_219ef +.asm_219dd + ld a, c + cp CH4 + jr z, .asm_219e6 + call Func_21e6d + ret c +.asm_219e6 + ld a, [$c005] + ld [$FF00+$24], a + xor a + ld [$c005], a +.asm_219ef + ld hl, $c026 + add hl, bc + ld [hl], b + ret + +Music8_callchannel: ; 219f5 (8:59f5) + cp $fd ; is this command a callchannel? + jp nz, Music8_loopchannel ; no + call Music8_GetNextMusicByte ; yes + push af + call Music8_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, $c006 + add hl, de + push hl + ld hl, $c016 + 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, $c02e + add hl, bc + set 1, [hl] ; set the call flag + jp Music8_endchannel + +Music8_loopchannel: ; 21a2a (8:5a2a) + cp $fe ; is this command a loopchannel? + jp nz, Music8_notetype ; no + call Music8_GetNextMusicByte ; yes + ld e, a + and a + jr z, .infiniteLoop + ld b, $0 + ld hl, $c0be + add hl, bc + ld a, [hl] + cp e + jr nz, .loopAgain + ld a, $1 ; if no more loops to make, + ld [hl], a + call Music8_GetNextMusicByte ; skip pointer + call Music8_GetNextMusicByte + jp Music8_endchannel +.loopAgain ; inc loop count + inc a + ld [hl], a + ; fall through +.infiniteLoop ; overwrite current address with pointer + call Music8_GetNextMusicByte + push af + call Music8_GetNextMusicByte + ld b, a + ld d, $0 + ld a, c + add a + ld e, a + ld hl, $c006 + add hl, de + pop af + ld [hli], a + ld [hl], b + jp Music8_endchannel + +Music8_notetype: ; 21a65 (8:5a65) + and $f0 + cp $d0 ; is this command a notetype? + jp nz, Music8_togglecall ; no + ld a, d ; yes + and $f + ld b, $0 + ld hl, $c0c6 + 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 Music8_GetNextMusicByte + ld d, a + ld a, c + cp CH2 + jr z, .musicChannel3 + cp CH6 + jr nz, .notChannel3 + ld hl, $c0e7 + jr .sfxChannel3 +.musicChannel3 + ld hl, $c0e6 +.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, $c0de + add hl, bc + ld [hl], d +.noiseChannel + jp Music8_endchannel + +Music8_togglecall: ; 21aa4 (8:5aa4) + ld a, d + cp $e8 ; is this command an togglecall? + jr nz, Music8_vibrato ; no + ld b, $0 ; yes + ld hl, $c02e + add hl, bc + ld a, [hl] + xor $1 + ld [hl], a ; flip bit 0 of $c02e (toggle returning from call) + jp Music8_endchannel + +Music8_vibrato: ; 21ab6 (8:5ab6) + cp $ea ; is this command a vibrato? + jr nz, Music8_pitchbend ; no + call Music8_GetNextMusicByte ; yes + ld b, $0 + ld hl, $c04e + add hl, bc + ld [hl], a ; store delay + ld hl, $c06e + add hl, bc + ld [hl], a ; store delay + call Music8_GetNextMusicByte + ld d, a + and $f0 + swap a + ld b, $0 + ld hl, $c056 + 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, $c05e + add hl, bc + swap a + or d + ld [hl], a ; store depth as both high and low nibbles + jp Music8_endchannel + +Music8_pitchbend: ; 21aee (8:5aee) + cp $eb ; is this command a pitchbend? + jr nz, Music8_duty ; no + call Music8_GetNextMusicByte ; yes + ld b, $0 + ld hl, $c076 + add hl, bc + ld [hl], a ; store first param + call Music8_GetNextMusicByte + ld d, a + and $f0 + swap a + ld b, a + ld a, d + and $f + call Func_22017 + ld b, $0 + ld hl, $c0a6 + add hl, bc + ld [hl], d ; store unknown part of second param + ld hl, $c0ae + add hl, bc + ld [hl], e ; store unknown part of second param + ld b, $0 + ld hl, $c02e + add hl, bc + set 4, [hl] ; set pitchbend flag + call Music8_GetNextMusicByte + ld d, a + jp Music8_notelength + +Music8_duty: ; 21b26 (8:5b26) + cp $ec ; is this command a duty? + jr nz, Music8_tempo ; no + call Music8_GetNextMusicByte ; yes + rrca + rrca + and $c0 + ld b, $0 + ld hl, $c03e + add hl, bc + ld [hl], a ; store duty + jp Music8_endchannel + +Music8_tempo: ; 21b3b (8:5b3b) + cp $ed ; is this command a tempo? + jr nz, Music8_unknownmusic0xee ; no + ld a, c ; yes + cp CH4 + jr nc, .sfxChannel + call Music8_GetNextMusicByte + ld [$c0e8], a ; store first param + call Music8_GetNextMusicByte + ld [$c0e9], a ; store second param + xor a + ld [$c0ce], a ; clear RAM + ld [$c0cf], a + ld [$c0d0], a + ld [$c0d1], a + jr .musicChannelDone +.sfxChannel + call Music8_GetNextMusicByte + ld [$c0ea], a ; store first param + call Music8_GetNextMusicByte + ld [$c0eb], a ; store second param + xor a + ld [$c0d2], a ; clear RAM + ld [$c0d3], a + ld [$c0d4], a + ld [$c0d5], a +.musicChannelDone + jp Music8_endchannel + +Music8_unknownmusic0xee: ; 21b7b (8:5b7b) + cp $ee ; is this command an unknownmusic0xee? + jr nz, Music8_unknownmusic0xef ; no + call Music8_GetNextMusicByte ; yes + ld [$c004], a ; store first param + jp Music8_endchannel + +; this appears to never be used +Music8_unknownmusic0xef: ; 21b88 (8:5b88) + cp $ef ; is this command an unknownmusic0xef? + jr nz, Music8_dutycycle ; no + call Music8_GetNextMusicByte ; yes + push bc + call Func_22035 + pop bc + ld a, [$c003] + and a + jr nz, .skip + ld a, [$c02d] + ld [$c003], a + xor a + ld [$c02d], a +.skip + jp Music8_endchannel + +Music8_dutycycle: ; 21ba7 (8:5ba7) + cp $fc ; is this command a dutycycle? + jr nz, Music8_stereopanning ; no + call Music8_GetNextMusicByte ; yes + ld b, $0 + ld hl, $c046 + add hl, bc + ld [hl], a ; store full cycle + and $c0 + ld hl, $c03e + add hl, bc + ld [hl], a ; store first duty + ld hl, $c02e + add hl, bc + set 6, [hl] ; set dutycycle flag + jp Music8_endchannel + +Music8_stereopanning: ; 21bc5 (8:5bc5) + cp $f0 ; is this command a stereopanning? + jr nz, Music8_executemusic ; no + call Music8_GetNextMusicByte ; yes + ld [$FF00+$24], a + jp Music8_endchannel + +Music8_executemusic: ; 21bd1 (8:5bd1) + cp $f8 ; is this command an executemusic? + jr nz, Music8_octave ; no + ld b, $0 ; yes + ld hl, $c036 + add hl, bc + set 0, [hl] + jp Music8_endchannel + +Music8_octave: ; 21be0 (8:5be0) + and $f0 + cp $e0 ; is this command an octave? + jr nz, Music8_unknownsfx0x20 ; no + ld hl, $c0d6 ; yes + ld b, $0 + add hl, bc + ld a, d + and $f + ld [hl], a ; store low nibble as octave + jp Music8_endchannel + +Music8_unknownsfx0x20: ; 21bf3 + cp $20 ; is this command an unknownsfx0x20? + jr nz, Music8_unknownsfx0x10 ; no + ld a, c + cp CH3 ; is this a noise or sfx channel? + jr c, Music8_unknownsfx0x10 ; no + ld b, $0 + ld hl, $c036 + add hl, bc + bit 0, [hl] + jr nz, Music8_unknownsfx0x10 ; no + call Music8_notelength + ld d, a + ld b, $0 + ld hl, $c03e + add hl, bc + ld a, [hl] + or d + ld d, a + ld b, $1 + call Func_21ff7 + ld [hl], d + call Music8_GetNextMusicByte + ld d, a + ld b, $2 + call Func_21ff7 + ld [hl], d + call Music8_GetNextMusicByte + ld e, a + ld a, c + cp CH7 + ld a, $0 + jr z, .sfxNoiseChannel ; only two params for noise channel + push de + call Music8_GetNextMusicByte + pop de +.sfxNoiseChannel + ld d, a + push de + call Func_21daa + call Func_21d79 + pop de + call Func_21dcc + ret + +Music8_unknownsfx0x10: ; 21c40 (8:5c40) + ld a, c + cp CH4 + jr c, Music8_note ; if not a sfx + ld a, d + cp $10 ; is this command a unknownsfx0x10? + jr nz, Music8_note ; no + ld b, $0 + ld hl, $c036 + add hl, bc + bit 0, [hl] + jr nz, Music8_note ; no + call Music8_GetNextMusicByte ; yes + ld [$FF00+$10], a + jp Music8_endchannel + +Music8_note: ; 21c5c (8:5c5c) + ld a, c + cp CH3 + jr nz, Music8_notelength ; if not noise channel + ld a, d + and $f0 + cp $b0 ; is this command a dnote? + jr z, Music8_dnote ; yes + jr nc, Music8_notelength ; no + swap a + ld b, a + ld a, d + and $f + ld d, a + ld a, b + push de + push bc + jr asm_21c7e + +Music8_dnote: ; 21c76 (8:5c76) + ld a, d + and $f + push af + push bc + call Music8_GetNextMusicByte ; get dnote instrument +asm_21c7e + ld d, a + ld a, [$c003] + and a + jr nz, .asm_21c89 + ld a, d + call Func_22035 +.asm_21c89 + pop bc + pop de + +Music8_notelength: ; 21c8b (8:5c8b) + 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, $c0c6 + add hl, bc + ld a, [hl] + ld l, b + call Func_22006 + ld a, c + cp CH4 + jr nc, .sfxChannel + ld a, [$c0e8] + ld d, a + ld a, [$c0e9] + ld e, a + jr .skip +.sfxChannel + ld d, $1 + ld e, $0 + cp CH7 + jr z, .skip ; if noise channel + call Func_21e2f + ld a, [$c0ea] + ld d, a + ld a, [$c0eb] + ld e, a +.skip + ld a, l + ld b, $0 + ld hl, $c0ce + add hl, bc + ld l, [hl] + call Func_22006 + ld e, l + ld d, h + ld hl, $c0ce + add hl, bc + ld [hl], e + ld a, d + ld hl, $c0b6 + add hl, bc + ld [hl], a + ld hl, $c036 + add hl, bc + bit 0, [hl] + jr nz, Music8_notepitch + ld hl, $c02e + add hl, bc + bit 2, [hl] + jr z, Music8_notepitch + pop hl + ret + +Music8_notepitch: ; 21ce9 (8:5ce9) + pop af + and $f0 + cp $c0 ; compare to rest + jr nz, .notRest + ld a, c + cp CH4 + jr nc, .sfxChannel + ld hl, $c02a + add hl, bc + ld a, [hl] + and a + jr nz, .done + ; fall through +.sfxChannel + ld a, c + cp CH2 + jr z, .musicChannel3 + cp CH6 + jr nz, .notSfxChannel3 +.musicChannel3 + ld b, $0 + ld hl, Unknown_222de + add hl, bc + ld a, [$FF00+$25] + and [hl] + ld [$FF00+$25], a + jr .done +.notSfxChannel3 + ld b, $2 + call Func_21ff7 + ld a, $8 + ld [hli], a + inc hl + ld a, $80 + ld [hl], a +.done + ret +.notRest + swap a + ld b, $0 + ld hl, $c0d6 + add hl, bc + ld b, [hl] + call Func_22017 + ld b, $0 + ld hl, $c02e + add hl, bc + bit 4, [hl] + jr z, .asm_21d39 + call Func_21f4e +.asm_21d39 + push de + ld a, c + cp CH4 + jr nc, .skip ; if sfx channel + ld hl, $c02a + ld d, $0 + ld e, a + add hl, de + ld a, [hl] + and a + jr nz, .asm_21d4c + jr .skip +.asm_21d4c + pop de + ret +.skip + ld b, $0 + ld hl, $c0de + add hl, bc + ld d, [hl] + ld b, $2 + call Func_21ff7 + ld [hl], d + call Func_21daa + call Func_21d79 + pop de + ld b, $0 + ld hl, $c02e + add hl, bc + bit 0, [hl] + jr z, .asm_21d70 + inc e + jr nc, .asm_21d70 + inc d +.asm_21d70 + ld hl, $c066 + add hl, bc + ld [hl], e + call Func_21dcc + ret + +Func_21d79: ; 21d79 (8:5d79) + ld b, $0 + ld hl, Unknown_222e6 + add hl, bc + ld a, [$FF00+$25] + or [hl] + ld d, a + ld a, c + cp CH7 + jr z, .sfxNoiseChannel + cp CH4 + jr nc, .skip ; if sfx channel + ld hl, $c02a + add hl, bc + ld a, [hl] + and a + jr nz, .skip +.sfxNoiseChannel + ld a, [$c004] + ld hl, Unknown_222e6 + add hl, bc + and [hl] + ld d, a + ld a, [$FF00+$25] + ld hl, Unknown_222de + add hl, bc + and [hl] + or d + ld d, a +.skip + ld a, d + ld [$FF00+$25], a + ret + +Func_21daa: ; 21daa (8:5daa) + ld b, $0 + ld hl, $c0b6 + 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, $c03e + add hl, bc + ld a, [hl] + or d + ld d, a +.channel3 + ld b, $1 + call Func_21ff7 + ld [hl], d + ret + +Func_21dcc: ; 21dcc (8:5dcc) + ld a, c + cp CH2 + jr z, .channel3 + cp CH6 + jr nz, .notSfxChannel3 + ; fall through +.channel3 + push de + ld de, $c0e6 + cp CH2 + jr z, .musicChannel3 + ld de, $c0e7 +.musicChannel3 + ld a, [de] + add a + ld d, $0 + ld e, a + ld hl, Music8_Channel3DutyPointers + add hl, de + ld e, [hl] + inc hl + ld d, [hl] + ld hl, $ff30 + ld b, $f + ld a, $0 + ld [$FF00+$1a], a +.loop + ld a, [de] + inc de + ld [hli], a + ld a, b + dec b + and a + jr nz, .loop + ld a, $80 + ld [$FF00+$1a], a + pop de +.notSfxChannel3 + ld a, d + or $80 + and $c7 + ld d, a + ld b, $3 + call Func_21ff7 + ld [hl], e + inc hl + ld [hl], d + ld a, c + cp CH4 + jr c, .musicChannel + call Func_21e56 +.musicChannel + ret + +Func_21e19: ; 21e19 (8:5e19) + ld a, c + cp CH4 + jr nz, .asm_21e2e + ld a, [$d083] + bit 7, a + jr z, .asm_21e2e + xor a + ld [$c0f1], a + ld a, $80 + ld [$c0f2], a +.asm_21e2e + ret + +Func_21e2f: ; 21e2f (8:5e2f) + call Func_21e8b + jr c, .asm_21e39 + call Func_21e9f + jr nc, .asm_21e4c +.asm_21e39 + ld d, $0 + ld a, [$c0f2] + add $80 + jr nc, .asm_21e43 + inc d +.asm_21e43 + ld [$c0eb], a + ld a, d + ld [$c0ea], a + jr .asm_21e55 +.asm_21e4c + xor a + ld [$c0eb], a + ld a, $1 + ld [$c0ea], a +.asm_21e55 + ret + +Func_21e56: ; 21e56 (8:5e56) + call Func_21e8b + jr c, .asm_21e60 + call Func_21e9f + jr nc, .asm_21e6c +.asm_21e60 + ld a, [$c0f1] + add e + jr nc, .asm_21e67 + inc d +.asm_21e67 + dec hl + ld e, a + ld [hl], e + inc hl + ld [hl], d +.asm_21e6c + ret + +Func_21e6d: ; 21e6d (8:5e6d) + call Func_21e8b + jr nc, .asm_21e88 + ld hl, $c006 + 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 $0 + ld [hl], a + scf + ret +.asm_21e88 + scf + ccf + ret + +Func_21e8b: ; 21e8b (8:5e8b) + ld a, [$c02a] + cp $14 + jr nc, .asm_21e94 + jr .asm_21e9a +.asm_21e94 + cp $86 + jr z, .asm_21e9a + jr c, .asm_21e9d +.asm_21e9a + scf + ccf + ret +.asm_21e9d + scf + ret + +Func_21e9f: ; 21e9f (8:5e9f) + ld a, [$c02d] + ld b, a + ld a, [$c02a] + or b + cp $9d + jr nc, .asm_21ead + jr .asm_21eb3 +.asm_21ead + cp $ea + jr z, .asm_21eb3 + jr c, .asm_21eb6 +.asm_21eb3 + scf + ccf + ret +.asm_21eb6 + scf + ret + +Music8_ApplyPitchBend: ; 21eb8 (8:5eb8) + ld hl, $c02e + add hl, bc + bit 5, [hl] + jp nz, .asm_21eff + ld hl, $c09e + add hl, bc + ld e, [hl] + ld hl, $c096 + add hl, bc + ld d, [hl] + ld hl, $c07e + add hl, bc + ld l, [hl] + ld h, b + add hl, de + ld d, h + ld e, l + ld hl, $c08e + add hl, bc + push hl + ld hl, $c086 + 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, $c0a6 + add hl, bc + ld a, [hl] + cp d + jp c, .asm_21f45 + jr nz, .asm_21f32 + ld hl, $c0ae + add hl, bc + ld a, [hl] + cp e + jp c, .asm_21f45 + jr .asm_21f32 +.asm_21eff + ld hl, $c09e + add hl, bc + ld a, [hl] + ld hl, $c096 + add hl, bc + ld d, [hl] + ld hl, $c07e + add hl, bc + ld e, [hl] + sub e + ld e, a + ld a, d + sbc b + ld d, a + ld hl, $c086 + 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, $c0a6 + add hl, bc + ld a, d + cp [hl] + jr c, .asm_21f45 + jr nz, .asm_21f32 + ld hl, $c0ae + add hl, bc + ld a, e + cp [hl] + jr c, .asm_21f45 +.asm_21f32 + ld hl, $c09e + add hl, bc + ld [hl], e + ld hl, $c096 + add hl, bc + ld [hl], d + ld b, $3 + call Func_21ff7 + ld a, e + ld [hli], a + ld [hl], d + ret +.asm_21f45 + ld hl, $c02e + add hl, bc + res 4, [hl] + res 5, [hl] + ret + +Func_21f4e: ; 21f4e (8:5f4e) + ld hl, $c096 + add hl, bc + ld [hl], d + ld hl, $c09e + add hl, bc + ld [hl], e + ld hl, $c0b6 + add hl, bc + ld a, [hl] + ld hl, $c076 + add hl, bc + sub [hl] + jr nc, .asm_21f66 + ld a, $1 +.asm_21f66 + ld [hl], a + ld hl, $c0ae + add hl, bc + ld a, e + sub [hl] + ld e, a + ld a, d + sbc b + ld hl, $c0a6 + add hl, bc + sub [hl] + jr c, .asm_21f82 + ld d, a + ld b, $0 + ld hl, $c02e + add hl, bc + set 5, [hl] + jr .asm_21fa5 +.asm_21f82 + ld hl, $c096 + add hl, bc + ld d, [hl] + ld hl, $c09e + add hl, bc + ld e, [hl] + ld hl, $c0ae + add hl, bc + ld a, [hl] + sub e + ld e, a + ld a, d + sbc b + ld d, a + ld hl, $c0a6 + add hl, bc + ld a, [hl] + sub d + ld d, a + ld b, $0 + ld hl, $c02e + add hl, bc + res 5, [hl] +.asm_21fa5 + ld hl, $c076 + add hl, bc +.asm_21fa9 + inc b + ld a, e + sub [hl] + ld e, a + jr nc, .asm_21fa9 + ld a, d + and a + jr z, .asm_21fb7 + dec a + ld d, a + jr .asm_21fa9 +.asm_21fb7 + ld a, e + add [hl] + ld d, b + ld b, $0 + ld hl, $c07e + add hl, bc + ld [hl], d + ld hl, $c086 + add hl, bc + ld [hl], a + ld hl, $c08e + add hl, bc + ld [hl], a + ret + +Music8_ApplyDutyCycle: ; 21fcc (8:5fcc) + ld b, $0 + ld hl, $c046 + add hl, bc + ld a, [hl] + rlca + rlca + ld [hl], a + and $c0 + ld d, a + ld b, $1 + call Func_21ff7 + ld a, [hl] + and $3f + or d + ld [hl], a + ret + +Music8_GetNextMusicByte: ; 21fe4 (8:5fe4) + ld d, $0 + ld a, c + add a + ld e, a + ld hl, $c006 + 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_21ff7: ; 21ff7 (8:5ff7) + ld a, c + ld hl, Unknown_222d6 + add l + jr nc, .noCarry + inc h +.noCarry + ld l, a + ld a, [hl] + add b + ld l, a + ld h, $ff + ret + +Func_22006: ; 22006 (8:6006) + 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_22017: ; 22017 (8:6017) + ld h, $0 + ld l, a + add hl, hl + ld d, h + ld e, l + ld hl, Unknown_222ee + add hl, de + ld e, [hl] + inc hl + ld d, [hl] + ld a, b +.loop + cp CH7 + jr z, .done + sra d + rr e + inc a + jr .loop +.done + ld a, $8 + add d + ld d, a + ret + +Func_22035: ; 22035 (8:6035) + ld [$c001], a + cp $ff + jp z, Func_221f3 + cp $e9 + jp z, Func_2210d + jp c, Func_2210d + cp $fe + jr z, .asm_2204c + jp nc, Func_2210d +.asm_2204c + xor a + ld [$c000], a + ld [$c003], a + ld [$c0e9], a + ld [$c0e6], a + ld [$c0e7], a + ld d, $8 + ld hl, $c016 + call FillMusicRAM8 + ld hl, $c006 + call FillMusicRAM8 + ld d, $4 + ld hl, $c026 + call FillMusicRAM8 + ld hl, $c02e + call FillMusicRAM8 + ld hl, $c03e + call FillMusicRAM8 + ld hl, $c046 + call FillMusicRAM8 + ld hl, $c04e + call FillMusicRAM8 + ld hl, $c056 + call FillMusicRAM8 + ld hl, $c05e + call FillMusicRAM8 + ld hl, $c066 + call FillMusicRAM8 + ld hl, $c06e + call FillMusicRAM8 + ld hl, $c036 + call FillMusicRAM8 + ld hl, $c076 + call FillMusicRAM8 + ld hl, $c07e + call FillMusicRAM8 + ld hl, $c086 + call FillMusicRAM8 + ld hl, $c08e + call FillMusicRAM8 + ld hl, $c096 + call FillMusicRAM8 + ld hl, $c09e + call FillMusicRAM8 + ld hl, $c0a6 + call FillMusicRAM8 + ld hl, $c0ae + call FillMusicRAM8 + ld a, $1 + ld hl, $c0be + call FillMusicRAM8 + ld hl, $c0b6 + call FillMusicRAM8 + ld hl, $c0c6 + call FillMusicRAM8 + ld [$c0e8], a + ld a, $ff + ld [$c004], a + xor a + ld [$FF00+$24], a + ld a, $8 + ld [$FF00+$10], a + ld a, $0 + ld [$FF00+$25], a + xor a + ld [$FF00+$1a], a + ld a, $80 + ld [$FF00+$1a], a + ld a, $77 + ld [$FF00+$24], a + jp Func_2224e + +Func_2210d: ; 2210d (8:610d) + ld l, a + ld e, a + ld h, $0 + ld d, h + add hl, hl + add hl, de + ld de, SFX_Headers_08 + add hl, de + ld a, h + ld [$c0ec], a + ld a, l + ld [$c0ed], a + ld a, [hl] + and $c0 + rlca + rlca + ld c, a +.asm_22126 + ld d, c + ld a, c + add a + add c + ld c, a + ld b, $0 + ld a, [$c0ec] + ld h, a + ld a, [$c0ed] + ld l, a + add hl, bc + ld c, d + ld a, [hl] + and $f + ld e, a + ld d, $0 + ld hl, $c026 + add hl, de + ld a, [hl] + and a + jr z, .asm_22162 + ld a, e + cp $7 + jr nz, .asm_22159 + ld a, [$c001] + cp $14 + jr nc, .asm_22152 + ret +.asm_22152 + ld a, [hl] + cp $14 + jr z, .asm_22162 + jr c, .asm_22162 +.asm_22159 + ld a, [$c001] + cp [hl] + jr z, .asm_22162 + jr c, .asm_22162 + ret +.asm_22162 + xor a + push de + ld h, d + ld l, e + add hl, hl + ld d, h + ld e, l + ld hl, $c016 + add hl, de + ld [hli], a + ld [hl], a + ld hl, $c006 + add hl, de + ld [hli], a + ld [hl], a + pop de + ld hl, $c026 + add hl, de + ld [hl], a + ld hl, $c02e + add hl, de + ld [hl], a + ld hl, $c03e + add hl, de + ld [hl], a + ld hl, $c046 + add hl, de + ld [hl], a + ld hl, $c04e + add hl, de + ld [hl], a + ld hl, $c056 + add hl, de + ld [hl], a + ld hl, $c05e + add hl, de + ld [hl], a + ld hl, $c066 + add hl, de + ld [hl], a + ld hl, $c06e + add hl, de + ld [hl], a + ld hl, $c076 + add hl, de + ld [hl], a + ld hl, $c07e + add hl, de + ld [hl], a + ld hl, $c086 + add hl, de + ld [hl], a + ld hl, $c08e + add hl, de + ld [hl], a + ld hl, $c096 + add hl, de + ld [hl], a + ld hl, $c09e + add hl, de + ld [hl], a + ld hl, $c0a6 + add hl, de + ld [hl], a + ld hl, $c0ae + add hl, de + ld [hl], a + ld hl, $c036 + add hl, de + ld [hl], a + ld a, $1 + ld hl, $c0be + add hl, de + ld [hl], a + ld hl, $c0b6 + add hl, de + ld [hl], a + ld hl, $c0c6 + add hl, de + ld [hl], a + ld a, e + cp $4 + jr nz, .asm_221ea + ld a, $8 + ld [$FF00+$10], a +.asm_221ea + ld a, c + and a + jp z, Func_2224e + dec c + jp .asm_22126 + +Func_221f3: ; 221f3 (8:61f3) + ld a, $80 + ld [$FF00+$26], a + ld [$FF00+$1a], a + xor a + ld [$FF00+$25], a + ld [$FF00+$1c], a + ld a, $8 + ld [$FF00+$10], a + ld [$FF00+$12], a + ld [$FF00+$17], a + ld [$FF00+$21], a + ld a, $40 + ld [$FF00+$14], a + ld [$FF00+$19], a + ld [$FF00+$23], a + ld a, $77 + ld [$FF00+$24], a + xor a + ld [$c000], a + ld [$c003], a + ld [$c002], a + ld [$c0e9], a + ld [$c0eb], a + ld [$c0e6], a + ld [$c0e7], a + ld d, $a0 + ld hl, $c006 + call FillMusicRAM8 + ld a, $1 + ld d, $18 + ld hl, $c0b6 + call FillMusicRAM8 + ld [$c0e8], a + ld [$c0ea], a + ld a, $ff + ld [$c004], a + ret + +; fills d bytes at hl with a +FillMusicRAM8: ; 22248 (8:6248) + ld b, d +.loop + ld [hli], a + dec b + jr nz, .loop + ret + +Func_2224e: ; 2224e (8:624e) + ld a, [$c001] + ld l, a + ld e, a + ld h, $0 + ld d, h + add hl, hl + add hl, de + ld de, SFX_Headers_08 + add hl, de + ld e, l + ld d, h + ld hl, $c006 + 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_22270 + cp c + jr z, .asm_22278 + inc c + inc hl + inc hl + jr .asm_22270 +.asm_22278 + push hl + push bc + push af + ld b, $0 + ld c, a + ld hl, $c026 + add hl, bc + ld a, [$c001] + ld [hl], a + pop af + cp $3 + jr c, .asm_22291 + ld hl, $c02e + add hl, bc + set 2, [hl] +.asm_22291 + pop bc + pop hl + ld a, [de] ; get channel pointer + ld [hli], a + inc de + ld a, [de] + ld [hli], a + inc de + inc c + dec b + ld a, b + and a + ld a, [de] + inc de + jr nz, .asm_22270 + ld a, [$c001] + cp $14 + jr nc, .asm_222aa + jr .asm_222d4 +.asm_222aa + ld a, [$c001] + cp $86 + jr z, .asm_222d4 + jr c, .asm_222b5 + jr .asm_222d4 +.asm_222b5 + ld hl, $c02a + ld [hli], a + ld [hli], a + ld [hli], a + ld [hl], a + ld hl, $c012 ; sfx noise channel pointer + ld de, Noise8_endchannel + ld [hl], e + inc hl + ld [hl], d ; overwrite pointer to point to endchannel + ld a, [$c005] + and a + jr nz, .asm_222d4 + ld a, [$FF00+$24] + ld [$c005], a + ld a, $77 + ld [$FF00+$24], a +.asm_222d4 + ret + +Noise8_endchannel: ; 222d5 (8:62d5) + endchannel + +Unknown_222d6: ; 222d6 (8:62d6) + db $10, $15, $1A, $1F ; channels 0-3 + db $10, $15, $1A, $1F ; channels 4-7 + +Unknown_222de: ; 222de (8:62de) + db $EE, $DD, $BB, $77 ; channels 0-3 + db $EE, $DD, $BB, $77 ; channels 4-7 + +Unknown_222e6: ; 222e6 (8:62e6) + db $11, $22, $44, $88 ; channels 0-3 + db $11, $22, $44, $88 ; channels 4-7 + +Unknown_222ee: ; 222ee (8:62ee) + dw $F82C + dw $F89D + dw $F907 + dw $F96B + dw $F9CA + dw $FA23 + dw $FA77 + dw $FAC7 + dw $FB12 + dw $FB58 + dw $FB9B + dw $FBDA + + |