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Diffstat (limited to 'audio/engine_1.asm')
| -rw-r--r-- | audio/engine_1.asm | 1682 |
1 files changed, 1682 insertions, 0 deletions
diff --git a/audio/engine_1.asm b/audio/engine_1.asm new file mode 100644 index 00000000..0d60308a --- /dev/null +++ b/audio/engine_1.asm @@ -0,0 +1,1682 @@ +; The first of three duplicated sound engines. + +Func_9103: ; 0x9103 + ld c, CH0 +.loop + ld b, $0 + ld hl, $c026 + add hl, bc + ld a, [hl] + and a + jr z, .nextChannel + ld a, c + cp CH4 + jr nc, .asm_912e ; if sfx channel + ld a, [$c002] + and a + jr z, .asm_912e + 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 +.asm_912e + call 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 $c02e: +; 1: call has been used +; 3: a toggle used only by this routine for vibrato +; 4: pitchbend flag +; 6: dutycycle flag +Music2_ApplyMusicAffects: ; 0x9138 + 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, 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, $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 Music2_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 Music2_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_9838 + 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 +Music2_PlayNextNote ; 0x91d0 + 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] + call Music2_endchannel + ret + +Music2_endchannel: ; 0x91e6 + call Music2_GetNextMusicByte + ld d, a + cp $ff ; is this command an endchannel? + jp nz, Music2_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_923f +.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+$1a], a +.notSfxChannel3 + jr nz, .asm_9222 + ld a, [$c003] + and a + jr z, .asm_9222 + xor a + ld [$c003], a + jr .asm_923f +.asm_9222 + jr .asm_9248 +.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, $c016 + add hl, de + ld e, l + ld d, h + pop hl + ld a, [de] + ld [hli], a + inc de + ld a, [de] + ld [hl], a ; loads channel address to return to + jp Music2_endchannel +.asm_923f + ld hl, Unknown_9b1f + add hl, bc + ld a, [$ff00+$25] + and [hl] + ld [$ff00+$25], a +.asm_9248 + ld a, [$c02a] + cp $14 + jr nc, .asm_9251 + jr .asm_926e +.asm_9251 + ld a, [$c02a] + cp $86 + jr z, .asm_926e + jr c, .asm_925c + jr .asm_926e +.asm_925c + ld a, c + cp CH4 + jr z, .asm_9265 + call Func_96c7 + ret c +.asm_9265 + ld a, [$c005] + ld [$ff00+$24], a + xor a + ld [$c005], a +.asm_926e + ld hl, $c026 + add hl, bc + ld [hl], b + ret + +Music2_callchannel: ; 0x9274 + cp $fd ; is this command a callchannel? + jp nz, Music2_loopchannel ; no + call Music2_GetNextMusicByte ; yes + push af + call Music2_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 Music2_endchannel + +Music2_loopchannel: ; 0x92a9 + cp $fe ; is this command a loopchannel? + jp nz, Music2_notetype ; no + call Music2_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 Music2_GetNextMusicByte ; skip pointer + call Music2_GetNextMusicByte + jp Music2_endchannel +.loopAgain ; inc loop count + inc a + ld [hl], a + ; fall through +.infiniteLoop ; overwrite current address with pointer + call Music2_GetNextMusicByte + push af + call Music2_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 Music2_endchannel + +Music2_notetype: ; 0x92e4 + and $f0 + cp $d0 ; is this command a notetype? + jp nz, Music2_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 Music2_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 Music2_endchannel + +Music2_togglecall: ; 0x9323 + ld a, d + cp $e8 ; is this command an togglecall? + jr nz, Music2_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 Music2_endchannel + +Music2_vibrato: ; 0x9335 + cp $ea ; is this command a vibrato? + jr nz, Music2_pitchbend ; no + call Music2_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 Music2_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 Music2_endchannel + +Music2_pitchbend: ; 0x936d + cp $eb ; is this command a pitchbend? + jr nz, Music2_duty ; no + call Music2_GetNextMusicByte ; yes + ld b, $0 + ld hl, $c076 + add hl, bc + ld [hl], a ; store first param + call Music2_GetNextMusicByte + ld d, a + and $f0 + swap a + ld b, a + ld a, d + and $f + call Func_9858 + 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 Music2_GetNextMusicByte + ld d, a + jp Music2_notelength + +Music2_duty: ; 0x93a5 + cp $ec ; is this command a duty? + jr nz, Music2_tempo ; no + call Music2_GetNextMusicByte ; yes + rrca + rrca + and $c0 + ld b, $0 + ld hl, $c03e + add hl, bc + ld [hl], a ; store duty + jp Music2_endchannel + +Music2_tempo: ; 0x93ba + cp $ed ; is this command a tempo? + jr nz, Music2_unknownmusic0xee ; no + ld a, c ; yes + cp CH4 + jr nc, .sfxChannel + call Music2_GetNextMusicByte + ld [$c0e8], a ; store first param + call Music2_GetNextMusicByte + ld [$c0e9], a ; store second param + xor a + ld [$c0ce], a ; clear RAM + ld [$c0cf], a + ld [$c0d0], a + ld [$c0d1], a + jr .musicChannelDone +.sfxChannel + call Music2_GetNextMusicByte + ld [$c0ea], a ; store first param + call Music2_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 Music2_endchannel + +Music2_unknownmusic0xee: ; 0x93fa + cp $ee ; is this command an unknownmusic0xee? + jr nz, Music2_unknownmusic0xef ; no + call Music2_GetNextMusicByte ; yes + ld [$c004], a ; store first param + jp Music2_endchannel + +; this appears to never be used +Music2_unknownmusic0xef ; 0x9407 + cp $ef ; is this command an unknownmusic0xef? + jr nz, Music2_dutycycle ; no + call Music2_GetNextMusicByte ; yes + push bc + call Func_9876 + pop bc + ld a, [$c003] + and a + jr nz, .skip + ld a, [$c02d] + ld [$c003], a + xor a + ld [$c02d], a +.skip + jp Music2_endchannel + +Music2_dutycycle: ; 0x9426 + cp $fc ; is this command a dutycycle? + jr nz, Music2_stereopanning ; no + call Music2_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 Music2_endchannel + +Music2_stereopanning: ; 0x9444 + cp $f0 ; is this command a stereopanning? + jr nz, Music2_executemusic ; no + call Music2_GetNextMusicByte ; yes + ld [$ff00+$24], a ; store stereopanning + jp Music2_endchannel + +Music2_executemusic: ; 0x9450 + cp $f8 ; is this command an executemusic? + jr nz, Music2_octave ; no + ld b, $0 ; yes + ld hl, $c036 + add hl, bc + set 0, [hl] + jp Music2_endchannel + +Music2_octave: ; 0x945f + and $f0 + cp $e0 ; is this command an octave? + jr nz, Music2_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 Music2_endchannel + +Music2_unknownsfx0x20: ; 0x9472 + cp $20 ; is this command an unknownsfx0x20? + jr nz, Music2_unknownsfx0x10 ; no + ld a, c + cp CH3 ; is this a noise or sfx channel? + jr c, Music2_unknownsfx0x10 ; no + ld b, $0 + ld hl, $c036 + add hl, bc + bit 0, [hl] + jr nz, Music2_unknownsfx0x10 ; no + call Music2_notelength ; yes + 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_9838 + ld [hl], d + call Music2_GetNextMusicByte + ld d, a + ld b, $2 + call Func_9838 + ld [hl], d + call Music2_GetNextMusicByte + ld e, a + ld a, c + cp CH7 + ld a, $0 + jr z, .sfxNoiseChannel ; only two params for noise channel + push de + call Music2_GetNextMusicByte + pop de +.sfxNoiseChannel + ld d, a + push de + call Func_9629 + call Func_95f8 + pop de + call Func_964b + ret + +Music2_unknownsfx0x10: + ld a, c + cp CH4 + jr c, Music2_note ; if not a sfx + ld a, d + cp $10 ; is this command a unknownsfx0x10? + jr nz, Music2_note ; no + ld b, $0 + ld hl, $c036 + add hl, bc + bit 0, [hl] + jr nz, Music2_note ; no + call Music2_GetNextMusicByte ; yes + ld [$ff00+$10], a + jp Music2_endchannel + +Music2_note: + ld a, c + cp CH3 + jr nz, Music2_notelength ; if not noise channel + ld a, d + and $f0 + cp $b0 ; is this command a dnote? + jr z, Music2_dnote ; yes + jr nc, Music2_notelength ; no + swap a + ld b, a + ld a, d + and $f + ld d, a + ld a, b + push de + push bc + jr asm_94fd + +Music2_dnote: + ld a, d + and $f + push af + push bc + call Music2_GetNextMusicByte ; get dnote instrument +asm_94fd + ld d, a + ld a, [$c003] + and a + jr nz, .asm_9508 + ld a, d + call Func_9876 +.asm_9508 + pop bc + pop de + +Music2_notelength: ; 0x950a + 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, $c0c6 + add hl, bc + ld a, [hl] + ld l, b + call Func_9847 + ld a, c + cp CH4 + jr nc, .sfxChannel + ld a, [$c0e8] + ld d, a + ld a, [$c0e9] + ld e, a + jr .skip +.sfxChannel + ld d, $1 + ld e, $0 + cp CH7 + jr z, .skip ; if noise channel + call Func_9693 + ld a, [$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_9847 + 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, Music2_notepitch + ld hl, $c02e + add hl, bc + bit 2, [hl] + jr z, Music2_notepitch + pop hl + ret + +Music2_notepitch: ; 0x9568 + 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, $0 + ld hl, Unknown_9b1f + add hl, bc + ld a, [$ff00+$25] + and [hl] + ld [$ff00+$25], a + jr .done +.notSfxChannel3 + ld b, $2 + call Func_9838 + 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_9858 + ld b, $0 + ld hl, $c02e + add hl, bc + bit 4, [hl] + jr z, .asm_95b8 + call Func_978f +.asm_95b8 + 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_95cb + jr .skip +.asm_95cb + pop de + ret +.skip + ld b, $0 + ld hl, $c0de + add hl, bc + ld d, [hl] + ld b, $2 + call Func_9838 + ld [hl], d + call Func_9629 + call Func_95f8 + pop de + ld b, $0 + ld hl, $c02e + add hl, bc + bit 0, [hl] + jr z, .asm_95ef + inc e + jr nc, .asm_95ef + inc d +.asm_95ef + ld hl, $c066 + add hl, bc + ld [hl], e + call Func_964b + ret + +Func_95f8: ; 0x95f8 + ld b, $0 + ld hl, Unknown_9b27 + add hl, bc + ld a, [$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_9b27 + add hl, bc + and [hl] + ld d, a + ld a, [$ff00+$25] + ld hl, Unknown_9b1f + add hl, bc + and [hl] + or d + ld d, a +.skip + ld a, d + ld [$ff00+$25], a + ret + +Func_9629: ; 0x9629 + 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_9838 + ld [hl], d + ret + +Func_964b: ; 0x964b + 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, Music2_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_9838 + ld [hl], e + inc hl + ld [hl], d + call Func_96b5 + ret + +Func_9693: ; 0x9693 + call Func_96e5 + jr nc, .asm_96ab + ld d, $0 + ld a, [$c0f2] + add $80 + jr nc, .asm_96a2 + inc d +.asm_96a2 + ld [$c0eb], a + ld a, d + ld [$c0ea], a + jr .asm_96b4 +.asm_96ab + xor a + ld [$c0eb], a + ld a, $1 + ld [$c0ea], a +.asm_96b4 + ret + +Func_96b5: ; 0x96b5 + call Func_96e5 + jr nc, .asm_96c6 + ld a, [$c0f1] + add e + jr nc, .asm_96c1 + inc d +.asm_96c1 + dec hl + ld e, a + ld [hl], e + inc hl + ld [hl], d +.asm_96c6 + ret + +Func_96c7: ; 0x96c7 + call Func_96e5 + jr nc, .asm_96e2 + 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 $0 + ld [hl], a + scf + ret +.asm_96e2 + scf + ccf + ret + +Func_96e5: ; 0x96e5 + ld a, [$c02a] + cp $14 + jr nc, .asm_96ee + jr .asm_96f4 +.asm_96ee + cp $86 + jr z, .asm_96f4 + jr c, .asm_96f7 +.asm_96f4 + scf + ccf + ret +.asm_96f7 + scf + ret + +Music2_ApplyPitchBend: ; 0x96f9 + ld hl, $c02e + add hl, bc + bit 5, [hl] + jp nz, .asm_9740 + 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_9786 + jr nz, .asm_9773 + ld hl, $c0ae + add hl, bc + ld a, [hl] + cp e + jp c, .asm_9786 + jr .asm_9773 +.asm_9740 + 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_9786 + jr nz, .asm_9773 + ld hl, $c0ae + add hl, bc + ld a, e + cp [hl] + jr c, .asm_9786 +.asm_9773 + ld hl, $c09e + add hl, bc + ld [hl], e + ld hl, $c096 + add hl, bc + ld [hl], d + ld b, $3 + call Func_9838 + ld a, e + ld [hli], a + ld [hl], d + ret +.asm_9786 + ld hl, $c02e + add hl, bc + res 4, [hl] + res 5, [hl] + ret + +Func_978f: ; 0x978f + 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_97a7 + ld a, $1 +.asm_97a7 + 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_97c3 + ld d, a + ld b, $0 + ld hl, $c02e + add hl, bc + set 5, [hl] + jr .asm_97e6 +.asm_97c3 + 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_97e6 + ld hl, $c076 + add hl, bc +.asm_97ea + inc b + ld a, e + sub [hl] + ld e, a + jr nc, .asm_97ea + ld a, d + and a + jr z, .asm_97f8 + dec a + ld d, a + jr .asm_97ea +.asm_97f8 + 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 + +Music2_ApplyDutyCycle: ; 0x980d + 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_9838 + ld a, [hl] + and $3f + or d + ld [hl], a + ret + +Music2_GetNextMusicByte: ; 0x9825 + 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_9838: ; 0x9838 + ld a, c + ld hl, Unknown_9b17 + add l + jr nc, .noCarry + inc h +.noCarry + ld l, a + ld a, [hl] + add b + ld l, a + ld h, $ff + ret + +Func_9847: ; 0x9847 + 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_9858: ; 0x9858 + ld h, $0 + ld l, a + add hl, hl + ld d, h + ld e, l + ld hl, Unknown_9b2f + 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, $8 + add d + ld d, a + ret + +Func_9876: ; 0x9876 + ld [$c001], a + cp $ff + jp z, Func_9a34 + cp $b9 + jp z, Func_994e + jp c, Func_994e + cp $fe + jr z, .asm_988d + jp nc, Func_994e +.asm_988d + xor a + ld [$c000], a + ld [$c003], a + ld [$c0e9], a + ld [$c0e6], a + ld [$c0e7], a + ld d, $8 + ld hl, $c016 + call FillMusicRAM2 + ld hl, $c006 + call FillMusicRAM2 + ld d, $4 + ld hl, $c026 + call FillMusicRAM2 + ld hl, $c02e + call FillMusicRAM2 + ld hl, $c03e + call FillMusicRAM2 + ld hl, $c046 + call FillMusicRAM2 + ld hl, $c04e + call FillMusicRAM2 + ld hl, $c056 + call FillMusicRAM2 + ld hl, $c05e + call FillMusicRAM2 + ld hl, $c066 + call FillMusicRAM2 + ld hl, $c06e + call FillMusicRAM2 + ld hl, $c036 + call FillMusicRAM2 + ld hl, $c076 + call FillMusicRAM2 + ld hl, $c07e + call FillMusicRAM2 + ld hl, $c086 + call FillMusicRAM2 + ld hl, $c08e + call FillMusicRAM2 + ld hl, $c096 + call FillMusicRAM2 + ld hl, $c09e + call FillMusicRAM2 + ld hl, $c0a6 + call FillMusicRAM2 + ld hl, $c0ae + call FillMusicRAM2 + ld a, $1 + ld hl, $c0be + call FillMusicRAM2 + ld hl, $c0b6 + call FillMusicRAM2 + ld hl, $c0c6 + call FillMusicRAM2 + ld [$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_9a8f + +Func_994e: ; 0x994e + ld l, a + ld e, a + ld h, $0 + ld d, h + add hl, hl + add hl, de + ld de, SFX_Headers_02 + add hl, de + ld a, h + ld [$c0ec], a + ld a, l + ld [$c0ed], a + ld a, [hl] + and $c0 + rlca + rlca + ld c, a +.asm_9967 + 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_99a3 + ld a, e + cp $7 + jr nz, .asm_999a + ld a, [$c001] + cp $14 + jr nc, .asm_9993 + ret +.asm_9993 + ld a, [hl] + cp $14 + jr z, .asm_99a3 + jr c, .asm_99a3 +.asm_999a + ld a, [$c001] + cp [hl] + jr z, .asm_99a3 + jr c, .asm_99a3 + ret +.asm_99a3 + 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_9a2b + ld a, $8 + ld [$ff00+$10], a +.asm_9a2b + ld a, c + and a + jp z, Func_9a8f + dec c + jp .asm_9967 + +Func_9a34: ; 0x9a34 + 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 FillMusicRAM2 + ld a, $1 + ld d, $18 + ld hl, $c0b6 + call FillMusicRAM2 + ld [$c0e8], a + ld [$c0ea], a + ld a, $ff + ld [$c004], a + ret + +; fills d bytes at hl with a +FillMusicRAM2: ; 0x9a89 + ld b, d +.loop + ld [hli], a + dec b + jr nz, .loop + ret + +Func_9a8f: ; 0x9a8f + 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_02 + 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_9ab1 + cp c + jr z, .asm_9ab9 + inc c + inc hl + inc hl + jr .asm_9ab1 +.asm_9ab9 + 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_9ad2 + ld hl, $c02e + add hl, bc + set 2, [hl] +.asm_9ad2 + pop bc + pop hl + ld a, [de] ; get channel pointer + ld [hli], a + inc de + ld a, [de] + ld [hli], a + inc de + inc c + dec b + ld a, b + and a + ld a, [de] + inc de + jr nz, .asm_9ab1 + ld a, [$c001] + cp $14 + jr nc, .asm_9aeb + jr .asm_9b15 +.asm_9aeb + ld a, [$c001] + cp $86 + jr z, .asm_9b15 + jr c, .asm_9af6 + jr .asm_9b15 +.asm_9af6 + ld hl, $c02a + ld [hli], a + ld [hli], a + ld [hli], a + ld [hl], a + ld hl, $c012 ; sfx noise channel pointer + ld de, Noise2_endchannel + ld [hl], e + inc hl + ld [hl], d ; overwrite pointer to point to endchannel + ld a, [$c005] + and a + jr nz, .asm_9b15 + ld a, [$ff00+$24] + ld [$c005], a + ld a, $77 + ld [$ff00+$24], a +.asm_9b15 + ret + +Noise2_endchannel: ; 0x9b16 + endchannel + +Unknown_9b17: ; 0x9b17 + db $10, $15, $1A, $1F ; channels 0-3 + db $10, $15, $1A, $1F ; channels 4-7 + +Unknown_9b1f: ; 0x9b1f + db $EE, $DD, $BB, $77 ; channels 0-3 + db $EE, $DD, $BB, $77 ; channels 4-7 + +Unknown_9b27: ; 0x9b27 + db $11, $22, $44, $88 ; channels 0-3 + db $11, $22, $44, $88 ; channels 4-7 + +Unknown_9b2f: ; 0x9b2f + dw $F82C + dw $F89D + dw $F907 + dw $F96B + dw $F9CA + dw $FA23 + dw $FA77 + dw $FAC7 + dw $FB12 + dw $FB58 + dw $FB9B + dw $FBDA + + |