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Diffstat (limited to 'audio/engine_3.asm')
| -rw-r--r-- | audio/engine_3.asm | 1682 |
1 files changed, 1682 insertions, 0 deletions
diff --git a/audio/engine_3.asm b/audio/engine_3.asm new file mode 100644 index 00000000..1f285ee6 --- /dev/null +++ b/audio/engine_3.asm @@ -0,0 +1,1682 @@ +; The third of three duplicated sound engines. + +Func_7d177: ; 7d177 (1f:5177) + 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 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 $c02e: +; 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, $c0b6 ; 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, $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 Music1f_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 Music1f_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_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, $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 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, $c02e + 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, $c036 + add hl, bc + res 0, [hl] + cp CH6 + jr nz, .notSfxChannel3 + ld a, $0 + ld [$FF00+$1a], a + ld a, $80 + ld [$FF00+$1a], a +.notSfxChannel3 + jr nz, .asm_7d296 + ld a, [$c003] + and a + jr z, .asm_7d296 + xor a + ld [$c003], 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, $c006 + add hl, de + push hl ; store current channel address + ld hl, $c016 + add hl, de + ld e, l + ld d, h + pop hl + ld a, [de] + ld [hli], a + inc de + ld a, [de] + ld [hl], a ; loads channel address to return to + jp Music1f_endchannel +.asm_7d2b3 + ld hl, Unknown_7db93 + add hl, bc + ld a, [$FF00+$25] + and [hl] + ld [$FF00+$25], a +.asm_7d2bc + ld a, [$c02a] + cp $14 + jr nc, .asm_7d2c5 + jr .asm_7d2e2 +.asm_7d2c5 + ld a, [$c02a] + cp $86 + jr z, .asm_7d2e2 + jr c, .asm_7d2d0 + jr .asm_7d2e2 +.asm_7d2d0 + ld a, c + cp CH4 + jr z, .asm_7d2d9 + call Func_7d73b + ret c +.asm_7d2d9 + ld a, [$c005] + ld [$FF00+$24], a + xor a + ld [$c005], a +.asm_7d2e2 + ld hl, $c026 + 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, $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 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, $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 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, $c006 + 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, $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 Music1f_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 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, $c02e + add hl, bc + ld a, [hl] + xor $1 + ld [hl], a ; flip bit 0 of $c02e (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, $c04e + add hl, bc + ld [hl], a ; store delay + ld hl, $c06e + add hl, bc + ld [hl], a ; store delay + call Music1f_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 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, $c076 + 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, $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 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, $c03e + add hl, bc + ld [hl], a ; store duty + jp Music1f_endchannel + +Music1f_tempo: ; 7d42e (1f:542e) + cp $ed ; is this command a tempo? + jr nz, Music1f_unknownmusic0xee ; no + ld a, c ; yes + cp CH4 + jr nc, .sfxChannel + call Music1f_GetNextMusicByte + ld [$c0e8], a ; store first param + call Music1f_GetNextMusicByte + ld [$c0e9], a ; store second param + xor a + ld [$c0ce], a ; clear RAM + ld [$c0cf], a + ld [$c0d0], a + ld [$c0d1], a + jr .musicChannelDone +.sfxChannel + call Music1f_GetNextMusicByte + ld [$c0ea], a ; store first param + call Music1f_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 Music1f_endchannel + +Music1f_unknownmusic0xee: ; 7d46e (1f:546e) + cp $ee ; is this command an unknownmusic0xee? + jr nz, Music1f_unknownmusic0xef ; no + call Music1f_GetNextMusicByte ; yes + ld [$c004], a ; store first param + jp Music1f_endchannel + +; this appears to never be used +Music1f_unknownmusic0xef: ; 7d47b (1f:547b) + cp $ef ; is this command an unknownmusic0xef? + jr nz, Music1f_dutycycle ; no + call Music1f_GetNextMusicByte ; yes + push bc + call Func_7d8ea + pop bc + ld a, [$c003] + and a + jr nz, .skip + ld a, [$c02d] + ld [$c003], a + xor a + ld [$c02d], 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, $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 duty flag + jp Music1f_endchannel + +Music1f_stereopanning: ; 7d4b8 (1f:54b8) + cp $f0 ; is this command a stereopanning? + jr nz, Music1f_executemusic ; no + call Music1f_GetNextMusicByte ; yes + ld [$FF00+$24], 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, $c036 + 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, $c0d6 ; 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, $c036 + add hl, bc + bit 0, [hl] + jr nz, Music1f_unknownsfx0x10 ; no + call Music1f_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_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, $c036 + add hl, bc + bit 0, [hl] + jr nz, Music1f_note ; no + call Music1f_GetNextMusicByte ; yes + ld [$FF00+$10], 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 $f + push af + push bc + call Music1f_GetNextMusicByte ; get dnote instrument +asm_7d571 + ld d, a + ld a, [$c003] + 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, $c0c6 + add hl, bc + ld a, [hl] + ld l, b + call Func_7d8bb + ld a, c + cp CH4 + jr nc, .sfxChannel + ld a, [$c0e8] + ld d, a + ld a, [$c0e9] + ld e, a + jr .skip +.sfxChannel + ld d, $1 + ld e, $0 + cp CH7 + jr z, .skip ; if noise channel + call Func_7d707 + ld a, [$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_7d8bb + 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, Music1f_notepitch + ld hl, $c02e + 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, $c02a + 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, $0 + ld hl, Unknown_7db93 + add hl, bc + ld a, [$FF00+$25] + and [hl] + ld [$FF00+$25], 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, $c0d6 + add hl, bc + ld b, [hl] + call Func_7d8cc + ld b, $0 + ld hl, $c02e + 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, $c02a + 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, $c0de + 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, $c02e + add hl, bc + bit 0, [hl] + jr z, .asm_7d663 + inc e + jr nc, .asm_7d663 + inc d +.asm_7d663 + ld hl, $c066 + add hl, bc + ld [hl], e + call Func_7d6bf + ret + +Func_7d66c: ; 7d66c (1f:566c) + ld b, $0 + ld hl, Unknown_7db9b + add hl, bc + ld a, [$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_7db9b + add hl, bc + and [hl] + ld d, a + ld a, [$FF00+$25] + ld hl, Unknown_7db93 + add hl, bc + and [hl] + or d + ld d, a +.skip + ld a, d + ld [$FF00+$25], a + ret + +Func_7d69d: ; 7d69d (1f:569d) + 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_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, $c0e6 + cp CH2 + jr z, .musicChannel3 + ld de, $c0e7 +.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, $0 + ld [$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_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, $0 + ld a, [$c0f2] + add $80 + jr nc, .asm_7d716 + inc d +.asm_7d716 + ld [$c0eb], a + ld a, d + ld [$c0ea], a + jr .asm_7d728 +.asm_7d71f + xor a + ld [$c0eb], a + ld a, $1 + ld [$c0ea], a +.asm_7d728 + ret + +Func_7d729: ; 7d729 (1f:5729) + call Func_7d759 + jr nc, .asm_7d73a + ld a, [$c0f1] + 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, $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 $0 + ld [hl], a + scf + ret +.asm_7d756 + scf + ccf + ret + +Func_7d759: ; 7d759 (1f:5759) + ld a, [$c02a] + 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, $c02e + add hl, bc + bit 5, [hl] + jp nz, .asm_7d7b4 + 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_7d7fa + jr nz, .asm_7d7e7 + ld hl, $c0ae + add hl, bc + ld a, [hl] + cp e + jp c, .asm_7d7fa + jr .asm_7d7e7 +.asm_7d7b4 + 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_7d7fa + jr nz, .asm_7d7e7 + ld hl, $c0ae + add hl, bc + ld a, e + cp [hl] + jr c, .asm_7d7fa +.asm_7d7e7 + ld hl, $c09e + add hl, bc + ld [hl], e + ld hl, $c096 + 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, $c02e + add hl, bc + res 4, [hl] + res 5, [hl] + ret + +Func_7d803: ; 7d803 (1f:5803) + 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_7d81b + ld a, $1 +.asm_7d81b + 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_7d837 + ld d, a + ld b, $0 + ld hl, $c02e + add hl, bc + set 5, [hl] + jr .asm_7d85a +.asm_7d837 + 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_7d85a + ld hl, $c076 + 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, $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 + +Music1f_ApplyDutyCycle: ; 7d881 (1f:5881) + 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_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, $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_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, $8 + add d + ld d, a + ret + +Func_7d8ea: ; 7d8ea (1f:58ea) + ld [$c001], a + cp $ff + jp z, Func_7daa8 + cp $c2 + jp z, Func_7d9c2 + jp c, Func_7d9c2 + cp $fe + jr z, .asm_7d901 + jp nc, Func_7d9c2 +.asm_7d901 + xor a + ld [$c000], a + ld [$c003], a + ld [$c0e9], a + ld [$c0e6], a + ld [$c0e7], a + ld d, $8 + ld hl, $c016 + call FillMusicRAM1f + ld hl, $c006 + call FillMusicRAM1f + ld d, $4 + ld hl, $c026 + call FillMusicRAM1f + ld hl, $c02e + call FillMusicRAM1f + ld hl, $c03e + call FillMusicRAM1f + ld hl, $c046 + call FillMusicRAM1f + ld hl, $c04e + call FillMusicRAM1f + ld hl, $c056 + call FillMusicRAM1f + ld hl, $c05e + call FillMusicRAM1f + ld hl, $c066 + call FillMusicRAM1f + ld hl, $c06e + call FillMusicRAM1f + ld hl, $c036 + call FillMusicRAM1f + ld hl, $c076 + call FillMusicRAM1f + ld hl, $c07e + call FillMusicRAM1f + ld hl, $c086 + call FillMusicRAM1f + ld hl, $c08e + call FillMusicRAM1f + ld hl, $c096 + call FillMusicRAM1f + ld hl, $c09e + call FillMusicRAM1f + ld hl, $c0a6 + call FillMusicRAM1f + ld hl, $c0ae + call FillMusicRAM1f + ld a, $1 + ld hl, $c0be + call FillMusicRAM1f + ld hl, $c0b6 + call FillMusicRAM1f + ld hl, $c0c6 + call FillMusicRAM1f + ld [$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_7db03 + +Func_7d9c2: ; 7d9c2 (1f:59c2) + ld l, a + ld e, a + ld h, $0 + ld d, h + add hl, hl + add hl, de + ld de, SFX_Headers_1f + add hl, de + ld a, h + ld [$c0ec], a + ld a, l + ld [$c0ed], 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, $0 + ld a, [$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_7da17 + ld a, e + cp $7 + jr nz, .asm_7da0e + ld a, [$c001] + cp $14 + jr nc, .asm_7da07 + ret +.asm_7da07 + ld a, [hl] + cp $14 + jr z, .asm_7da17 + jr c, .asm_7da17 +.asm_7da0e + ld a, [$c001] + 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, $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_7da9f + ld a, $8 + ld [$FF00+$10], a +.asm_7da9f + ld a, c + and a + jp z, Func_7db03 + dec c + jp .asm_7d9db + +Func_7daa8: ; 7daa8 (1f:5aa8) + ld a, $80 + ld [$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 FillMusicRAM1f + ld a, $1 + ld d, $18 + ld hl, $c0b6 + call FillMusicRAM1f + ld [$c0e8], a + ld [$c0ea], a + ld a, $ff + ld [$c004], 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, [$c001] + 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, $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_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, $c026 + add hl, bc + ld a, [$c001] + ld [hl], a + pop af + cp $3 + jr c, .asm_7db46 + ld hl, $c02e + add hl, bc + set 2, [hl] +.asm_7db46 + pop bc + pop hl + ld a, [de] ; get channel pointer + ld [hli], a + inc de + ld a, [de] + ld [hli], a + inc de + inc c + dec b + ld a, b + and a + ld a, [de] + inc de + jr nz, .asm_7db25 + ld a, [$c001] + cp $14 + jr nc, .asm_7db5f + jr .asm_7db89 +.asm_7db5f + ld a, [$c001] + cp $86 + jr z, .asm_7db89 + jr c, .asm_7db6a + jr .asm_7db89 +.asm_7db6a + ld hl, $c02a + ld [hli], a + ld [hli], a + ld [hli], a + ld [hl], a + ld hl, $c012 ; sfx noise channel pointer + ld de, Noise1f_endchannel + ld [hl], e + inc hl + ld [hl], d ; overwrite pointer to point to endchannel + ld a, [$c005] + and a + jr nz, .asm_7db89 + ld a, [$FF00+$24] + ld [$c005], a + ld a, $77 + ld [$FF00+$24], 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 + + |