mirror of
https://github.com/pret/pokered.git
synced 2024-10-23 06:58:24 +00:00
1729 lines
32 KiB
NASM
1729 lines
32 KiB
NASM
; The first of three duplicated sound engines.
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Audio1_UpdateMusic::
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ld c, Ch0
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.loop
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ld b, 0
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ld hl, wChannelSoundIDs
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add hl, bc
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ld a, [hl]
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and a
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jr z, .nextChannel
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ld a, c
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cp Ch4
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jr nc, .applyAffects ; if sfx channel
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ld a, [wMuteAudioAndPauseMusic]
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and a
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jr z, .applyAffects
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bit 7, a
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jr nz, .nextChannel
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set 7, a
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ld [wMuteAudioAndPauseMusic], a
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xor a ; disable all channels' output
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ld [rNR51], a
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ld [rNR30], a
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ld a, $80
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ld [rNR30], a
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jr .nextChannel
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.applyAffects
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call Audio1_ApplyMusicAffects
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.nextChannel
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ld a, c
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inc c ; inc channel number
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cp Ch7
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jr nz, .loop
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ret
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; this routine checks flags for music effects currently applied
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; to the channel and calls certain functions based on flags.
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Audio1_ApplyMusicAffects:
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ld b, $0
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ld hl, wChannelNoteDelayCounters ; delay until next note
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add hl, bc
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ld a, [hl]
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cp $1 ; if the delay is 1, play next note
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jp z, Audio1_PlayNextNote
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dec a ; otherwise, decrease the delay timer
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ld [hl], a
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ld a, c
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cp Ch4
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jr nc, .startChecks ; if a sfx channel
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ld hl, wChannelSoundIDs + Ch4
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add hl, bc
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ld a, [hl]
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and a
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jr z, .startChecks
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ret
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.startChecks
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ld hl, wChannelFlags1
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add hl, bc
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bit BIT_ROTATE_DUTY, [hl]
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jr z, .checkForExecuteMusic
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call Audio1_ApplyDutyCycle
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.checkForExecuteMusic
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ld b, 0
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ld hl, wChannelFlags2
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add hl, bc
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bit BIT_EXECUTE_MUSIC, [hl]
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jr nz, .checkForPitchBend
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ld hl, wChannelFlags1
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add hl, bc
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bit BIT_NOISE_OR_SFX, [hl]
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jr nz, .skipPitchBendVibrato
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.checkForPitchBend
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ld hl, wChannelFlags1
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add hl, bc
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bit BIT_PITCH_BEND_ON, [hl]
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jr z, .checkVibratoDelay
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jp Audio1_ApplyPitchBend
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.checkVibratoDelay
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ld hl, wChannelVibratoDelayCounters
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add hl, bc
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ld a, [hl]
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and a ; check if delay is over
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jr z, .checkForVibrato
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dec [hl] ; otherwise, dec delay
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.skipPitchBendVibrato
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ret
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.checkForVibrato
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ld hl, wChannelVibratoExtents
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add hl, bc
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ld a, [hl]
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and a
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jr nz, .vibrato
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ret ; no vibrato
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.vibrato
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ld d, a
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ld hl, wChannelVibratoRates
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add hl, bc
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ld a, [hl]
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and $f
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and a
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jr z, .applyVibrato
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dec [hl] ; decrement counter
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ret
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.applyVibrato
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ld a, [hl]
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swap [hl]
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or [hl]
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ld [hl], a ; reload the counter
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ld hl, wChannelFrequencyLowBytes
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add hl, bc
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ld e, [hl] ; get note pitch
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ld hl, wChannelFlags1
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add hl, bc
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; This is the only code that sets/resets the vibrato direction bit, so it
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; continuously alternates which path it takes.
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bit BIT_VIBRATO_DIRECTION, [hl]
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jr z, .unset
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res BIT_VIBRATO_DIRECTION, [hl]
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ld a, d
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and $f
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ld d, a
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ld a, e
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sub d
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jr nc, .noCarry
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ld a, 0
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.noCarry
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jr .done
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.unset
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set BIT_VIBRATO_DIRECTION, [hl]
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ld a, d
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and $f0
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swap a
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add e
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jr nc, .done
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ld a, $ff
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.done
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ld d, a
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ld b, REG_FREQUENCY_LO
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call Audio1_GetRegisterPointer
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ld [hl], d
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ret
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; this routine executes all music commands that take up no time,
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; like tempo changes, duty changes etc. and doesn't return
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; until the first note is reached
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Audio1_PlayNextNote:
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; reload the vibrato delay counter
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ld hl, wChannelVibratoDelayCounterReloadValues
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add hl, bc
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ld a, [hl]
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ld hl, wChannelVibratoDelayCounters
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add hl, bc
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ld [hl], a
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ld hl, wChannelFlags1
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add hl, bc
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res BIT_PITCH_BEND_ON, [hl]
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res BIT_PITCH_BEND_DECREASING, [hl]
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call Audio1_endchannel
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ret
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Audio1_endchannel:
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call Audio1_GetNextMusicByte
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ld d, a
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cp $ff ; is this command an endchannel?
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jp nz, Audio1_callchannel ; no
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ld b, 0
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ld hl, wChannelFlags1
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add hl, bc
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bit BIT_CHANNEL_CALL, [hl]
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jr nz, .returnFromCall
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ld a, c
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cp Ch3
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jr nc, .noiseOrSfxChannel
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jr .disableChannelOutput
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.noiseOrSfxChannel
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res BIT_NOISE_OR_SFX, [hl]
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ld hl, wChannelFlags2
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add hl, bc
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res BIT_EXECUTE_MUSIC, [hl]
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cp Ch6
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jr nz, .skipSfxChannel3
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; restart hardware channel 3 (wave channel) output
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ld a, $0
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ld [rNR30], a
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ld a, $80
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ld [rNR30], a
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.skipSfxChannel3
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jr nz, .asm_9222
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ld a, [wDisableChannelOutputWhenSfxEnds]
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and a
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jr z, .asm_9222
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xor a
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ld [wDisableChannelOutputWhenSfxEnds], a
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jr .disableChannelOutput
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.asm_9222
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jr .asm_9248
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.returnFromCall
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res 1, [hl]
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ld d, $0
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ld a, c
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add a
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ld e, a
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ld hl, wChannelCommandPointers
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add hl, de
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push hl ; store current channel address
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ld hl, wChannelReturnAddresses
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add hl, de
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ld e, l
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ld d, h
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pop hl
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ld a, [de]
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ld [hli], a
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inc de
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ld a, [de]
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ld [hl], a ; loads channel address to return to
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jp Audio1_endchannel
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.disableChannelOutput
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ld hl, Audio1_HWChannelDisableMasks
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add hl, bc
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ld a, [rNR51]
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and [hl]
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ld [rNR51], a
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.asm_9248
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ld a, [wChannelSoundIDs + Ch4]
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cp CRY_SFX_START
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jr nc, .asm_9251
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jr .skipCry
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.asm_9251
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ld a, [wChannelSoundIDs + Ch4]
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cp CRY_SFX_END
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jr z, .skipCry
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jr c, .cry
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jr .skipCry
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.cry
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ld a, c
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cp Ch4
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jr z, .asm_9265
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call Audio1_GoBackOneCommandIfCry
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ret c
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.asm_9265
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ld a, [wSavedVolume]
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ld [rNR50], a
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xor a
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ld [wSavedVolume], a
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.skipCry
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ld hl, wChannelSoundIDs
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add hl, bc
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ld [hl], b
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ret
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Audio1_callchannel:
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cp $fd ; is this command a callchannel?
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jp nz, Audio1_loopchannel ; no
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call Audio1_GetNextMusicByte
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push af
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call Audio1_GetNextMusicByte
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ld d, a
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pop af
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ld e, a
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push de ; store pointer
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ld d, $0
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ld a, c
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add a
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ld e, a
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ld hl, wChannelCommandPointers
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add hl, de
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push hl
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ld hl, wChannelReturnAddresses
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add hl, de
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ld e, l
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ld d, h
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pop hl
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ld a, [hli]
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ld [de], a
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inc de
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ld a, [hld]
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ld [de], a ; copy current channel address
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pop de
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ld [hl], e
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inc hl
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ld [hl], d ; overwrite current address with pointer
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ld b, $0
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ld hl, wChannelFlags1
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add hl, bc
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set BIT_CHANNEL_CALL, [hl] ; set the call flag
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jp Audio1_endchannel
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Audio1_loopchannel:
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cp $fe ; is this command a loopchannel?
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jp nz, Audio1_notetype ; no
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call Audio1_GetNextMusicByte
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ld e, a
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and a
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jr z, .infiniteLoop
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ld b, 0
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ld hl, wChannelLoopCounters
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add hl, bc
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ld a, [hl]
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cp e
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jr nz, .loopAgain
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ld a, $1 ; if no more loops to make,
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ld [hl], a
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call Audio1_GetNextMusicByte ; skip pointer
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call Audio1_GetNextMusicByte
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jp Audio1_endchannel
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.loopAgain ; inc loop count
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inc a
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ld [hl], a
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; fall through
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.infiniteLoop ; overwrite current address with pointer
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call Audio1_GetNextMusicByte
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push af
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call Audio1_GetNextMusicByte
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ld b, a
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ld d, $0
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ld a, c
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add a
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ld e, a
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ld hl, wChannelCommandPointers
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add hl, de
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pop af
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ld [hli], a
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ld [hl], b
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jp Audio1_endchannel
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Audio1_notetype:
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and $f0
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cp $d0 ; is this command a notetype?
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jp nz, Audio1_toggleperfectpitch ; no
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ld a, d
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and $f
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ld b, $0
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ld hl, wChannelNoteSpeeds
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add hl, bc
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ld [hl], a ; store low nibble as speed
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ld a, c
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cp Ch3
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jr z, .noiseChannel ; noise channel has 0 params
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call Audio1_GetNextMusicByte
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ld d, a
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ld a, c
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cp Ch2
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jr z, .musicChannel3
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cp Ch6
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jr nz, .skipChannel3
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ld hl, wSfxWaveInstrument
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jr .channel3
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.musicChannel3
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ld hl, wMusicWaveInstrument
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.channel3
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ld a, d
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and $f
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ld [hl], a ; store low nibble of param as wave instrument
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ld a, d
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and $30
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sla a
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ld d, a
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; fall through
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; if channel 3, store high nibble as volume
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; else, store volume (high nibble) and fade (low nibble)
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.skipChannel3
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ld b, 0
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ld hl, wChannelVolumes
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add hl, bc
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ld [hl], d
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.noiseChannel
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jp Audio1_endchannel
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Audio1_toggleperfectpitch:
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ld a, d
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cp $e8 ; is this command a toggleperfectpitch?
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jr nz, Audio1_vibrato ; no
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ld b, 0
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ld hl, wChannelFlags1
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add hl, bc
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ld a, [hl]
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xor $1
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ld [hl], a ; flip bit 0 of wChannelFlags1
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jp Audio1_endchannel
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Audio1_vibrato:
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cp $ea ; is this command a vibrato?
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jr nz, Audio1_pitchbend ; no
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call Audio1_GetNextMusicByte
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ld b, 0
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ld hl, wChannelVibratoDelayCounters
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add hl, bc
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ld [hl], a ; store delay
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ld hl, wChannelVibratoDelayCounterReloadValues
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add hl, bc
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ld [hl], a ; store delay
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call Audio1_GetNextMusicByte
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ld d, a
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; The high nybble of the command byte is the extent of the vibrato.
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; Let n be the extent.
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; The upper nybble of the channel's byte in the wChannelVibratoExtents
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; array will store the extent above the note: (n / 2) + (n % 2).
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; The lower nybble will store the extent below the note: (n / 2).
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; These two values add to the total extent, n.
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and $f0
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swap a
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ld b, 0
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ld hl, wChannelVibratoExtents
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add hl, bc
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srl a
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ld e, a
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adc b
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swap a
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or e
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ld [hl], a
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; The low nybble of the command byte is the rate of the vibrato.
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; The high and low nybbles of the channel's byte in the wChannelVibratoRates
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; array are both initialised to this value because the high nybble is the
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; counter reload value and the low nybble is the counter itself, which should
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; start at its value upon reload.
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ld a, d
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and $f
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ld d, a
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ld hl, wChannelVibratoRates
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add hl, bc
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swap a
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or d
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ld [hl], a
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jp Audio1_endchannel
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Audio1_pitchbend:
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cp $eb ; is this command a pitchbend?
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jr nz, Audio1_duty ; no
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call Audio1_GetNextMusicByte
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ld b, 0
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ld hl, wChannelPitchBendLengthModifiers
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add hl, bc
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ld [hl], a
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call Audio1_GetNextMusicByte
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ld d, a
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and $f0
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swap a
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ld b, a
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ld a, d
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and $f
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call Audio1_CalculateFrequency
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ld b, 0
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ld hl, wChannelPitchBendTargetFrequencyHighBytes
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add hl, bc
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ld [hl], d
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ld hl, wChannelPitchBendTargetFrequencyLowBytes
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add hl, bc
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ld [hl], e
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ld b, 0
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ld hl, wChannelFlags1
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add hl, bc
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set BIT_PITCH_BEND_ON, [hl]
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call Audio1_GetNextMusicByte
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ld d, a
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jp Audio1_notelength
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Audio1_duty:
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cp $ec ; is this command a duty?
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jr nz, Audio1_tempo ; no
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call Audio1_GetNextMusicByte
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rrca
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rrca
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and $c0
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ld b, 0
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ld hl, wChannelDuties
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add hl, bc
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ld [hl], a ; store duty
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jp Audio1_endchannel
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Audio1_tempo:
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cp $ed ; is this command a tempo?
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jr nz, Audio1_stereopanning ; no
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ld a, c
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cp Ch4
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jr nc, .sfxChannel
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call Audio1_GetNextMusicByte
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ld [wMusicTempo], a ; store first param
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call Audio1_GetNextMusicByte
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ld [wMusicTempo + 1], a ; store second param
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xor a
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ld [wChannelNoteDelayCountersFractionalPart], a ; clear RAM
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ld [wChannelNoteDelayCountersFractionalPart + 1], a
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ld [wChannelNoteDelayCountersFractionalPart + 2], a
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ld [wChannelNoteDelayCountersFractionalPart + 3], a
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jr .musicChannelDone
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.sfxChannel
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call Audio1_GetNextMusicByte
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ld [wSfxTempo], a ; store first param
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call Audio1_GetNextMusicByte
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ld [wSfxTempo + 1], a ; store second param
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xor a
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ld [wChannelNoteDelayCountersFractionalPart + 4], a ; clear RAM
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ld [wChannelNoteDelayCountersFractionalPart + 5], a
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ld [wChannelNoteDelayCountersFractionalPart + 6], a
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ld [wChannelNoteDelayCountersFractionalPart + 7], a
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.musicChannelDone
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jp Audio1_endchannel
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Audio1_stereopanning:
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cp $ee ; is this command a stereopanning?
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jr nz, Audio1_unknownmusic0xef ; no
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call Audio1_GetNextMusicByte
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ld [wStereoPanning], a ; store panning
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jp Audio1_endchannel
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; this appears to never be used
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Audio1_unknownmusic0xef:
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cp $ef ; is this command an unknownmusic0xef?
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jr nz, Audio1_dutycycle ; no
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call Audio1_GetNextMusicByte
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push bc
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call Audio1_PlaySound
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pop bc
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ld a, [wDisableChannelOutputWhenSfxEnds]
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and a
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jr nz, .skip
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ld a, [wChannelSoundIDs + Ch7]
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ld [wDisableChannelOutputWhenSfxEnds], a
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xor a
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ld [wChannelSoundIDs + Ch7], a
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.skip
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jp Audio1_endchannel
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Audio1_dutycycle:
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cp $fc ; is this command a dutycycle?
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jr nz, Audio1_volume ; no
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call Audio1_GetNextMusicByte
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ld b, 0
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ld hl, wChannelDutyCycles
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add hl, bc
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ld [hl], a ; store full cycle
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and $c0
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ld hl, wChannelDuties
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add hl, bc
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ld [hl], a ; store first duty
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ld hl, wChannelFlags1
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add hl, bc
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set BIT_ROTATE_DUTY, [hl]
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jp Audio1_endchannel
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Audio1_volume:
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cp $f0 ; is this command a volume?
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jr nz, Audio1_executemusic ; no
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call Audio1_GetNextMusicByte
|
|
ld [rNR50], a ; store volume
|
|
jp Audio1_endchannel
|
|
|
|
Audio1_executemusic:
|
|
cp $f8 ; is this command an executemusic?
|
|
jr nz, Audio1_octave ; no
|
|
ld b, $0
|
|
ld hl, wChannelFlags2
|
|
add hl, bc
|
|
set BIT_EXECUTE_MUSIC, [hl]
|
|
jp Audio1_endchannel
|
|
|
|
Audio1_octave:
|
|
and $f0
|
|
cp $e0 ; is this command an octave?
|
|
jr nz, Audio1_sfxnote ; no
|
|
ld hl, wChannelOctaves
|
|
ld b, 0
|
|
add hl, bc
|
|
ld a, d
|
|
and $f
|
|
ld [hl], a ; store low nibble as octave
|
|
jp Audio1_endchannel
|
|
|
|
; sfxnote is either squarenote or noisenote depending on the channel
|
|
Audio1_sfxnote:
|
|
cp $20 ; is this command a sfxnote?
|
|
jr nz, Audio1_pitchenvelope
|
|
ld a, c
|
|
cp Ch3 ; is this a noise or sfx channel?
|
|
jr c, Audio1_pitchenvelope ; no
|
|
ld b, 0
|
|
ld hl, wChannelFlags2
|
|
add hl, bc
|
|
bit BIT_EXECUTE_MUSIC, [hl] ; is executemusic being used?
|
|
jr nz, Audio1_pitchenvelope ; yes
|
|
call Audio1_notelength
|
|
|
|
; This code seems to do the same thing as what Audio1_ApplyDutyAndSoundLength
|
|
; does below.
|
|
ld d, a
|
|
ld b, 0
|
|
ld hl, wChannelDuties
|
|
add hl, bc
|
|
ld a, [hl]
|
|
or d
|
|
ld d, a
|
|
ld b, REG_DUTY_SOUND_LEN
|
|
call Audio1_GetRegisterPointer
|
|
ld [hl], d
|
|
|
|
call Audio1_GetNextMusicByte
|
|
ld d, a
|
|
ld b, REG_VOLUME_ENVELOPE
|
|
call Audio1_GetRegisterPointer
|
|
ld [hl], d
|
|
call Audio1_GetNextMusicByte
|
|
ld e, a
|
|
ld a, c
|
|
cp Ch7
|
|
ld a, 0
|
|
jr z, .skip
|
|
; Channels 1 through 3 have 2 registers that control frequency, but the noise
|
|
; channel a single register (the polynomial counter) that controls frequency,
|
|
; so this command has one less byte on the noise channel.
|
|
push de
|
|
call Audio1_GetNextMusicByte
|
|
pop de
|
|
.skip
|
|
ld d, a
|
|
push de
|
|
call Audio1_ApplyDutyAndSoundLength
|
|
call Audio1_EnableChannelOutput
|
|
pop de
|
|
call Audio1_ApplyWavePatternAndFrequency
|
|
ret
|
|
|
|
Audio1_pitchenvelope:
|
|
ld a, c
|
|
cp Ch4
|
|
jr c, Audio1_note ; if not a sfx
|
|
ld a, d
|
|
cp $10 ; is this command a pitchenvelope?
|
|
jr nz, Audio1_note ; no
|
|
ld b, $0
|
|
ld hl, wChannelFlags2
|
|
add hl, bc
|
|
bit BIT_EXECUTE_MUSIC, [hl]
|
|
jr nz, Audio1_note ; no
|
|
call Audio1_GetNextMusicByte
|
|
ld [rNR10], a
|
|
jp Audio1_endchannel
|
|
|
|
Audio1_note:
|
|
ld a, c
|
|
cp Ch3
|
|
jr nz, Audio1_notelength ; if not noise channel
|
|
ld a, d
|
|
and $f0
|
|
cp $b0 ; is this command a dnote?
|
|
jr z, Audio1_dnote
|
|
jr nc, Audio1_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
|
|
|
|
Audio1_dnote:
|
|
ld a, d
|
|
and $f
|
|
push af
|
|
push bc
|
|
call Audio1_GetNextMusicByte ; get dnote instrument
|
|
asm_94fd
|
|
ld d, a
|
|
ld a, [wDisableChannelOutputWhenSfxEnds]
|
|
and a
|
|
jr nz, .asm_9508
|
|
ld a, d
|
|
call Audio1_PlaySound
|
|
.asm_9508
|
|
pop bc
|
|
pop de
|
|
|
|
Audio1_notelength:
|
|
ld a, d
|
|
push af
|
|
and $f
|
|
inc a
|
|
ld b, 0
|
|
ld e, a ; store note length (in 16ths)
|
|
ld d, b
|
|
ld hl, wChannelNoteSpeeds
|
|
add hl, bc
|
|
ld a, [hl]
|
|
ld l, b
|
|
call Audio1_MultiplyAdd
|
|
ld a, c
|
|
cp Ch4
|
|
jr nc, .sfxChannel
|
|
ld a, [wMusicTempo]
|
|
ld d, a
|
|
ld a, [wMusicTempo + 1]
|
|
ld e, a
|
|
jr .skip
|
|
.sfxChannel
|
|
ld d, $1
|
|
ld e, $0
|
|
cp Ch7
|
|
jr z, .skip ; if noise channel
|
|
call Audio1_SetSfxTempo
|
|
ld a, [wSfxTempo]
|
|
ld d, a
|
|
ld a, [wSfxTempo + 1]
|
|
ld e, a
|
|
.skip
|
|
ld a, l ; a = note_length * note_speed
|
|
ld b, 0
|
|
ld hl, wChannelNoteDelayCountersFractionalPart
|
|
add hl, bc
|
|
ld l, [hl]
|
|
call Audio1_MultiplyAdd
|
|
ld e, l
|
|
ld d, h ; de = note_delay_frac_part + (note_length * note_speed * tempo)
|
|
ld hl, wChannelNoteDelayCountersFractionalPart
|
|
add hl, bc
|
|
ld [hl], e
|
|
ld a, d
|
|
ld hl, wChannelNoteDelayCounters
|
|
add hl, bc
|
|
ld [hl], a
|
|
ld hl, wChannelFlags2
|
|
add hl, bc
|
|
bit BIT_EXECUTE_MUSIC, [hl]
|
|
jr nz, Audio1_notepitch
|
|
ld hl, wChannelFlags1
|
|
add hl, bc
|
|
bit BIT_NOISE_OR_SFX, [hl]
|
|
jr z, Audio1_notepitch
|
|
pop hl
|
|
ret
|
|
|
|
Audio1_notepitch:
|
|
pop af
|
|
and $f0
|
|
cp $c0 ; compare to rest
|
|
jr nz, .notRest
|
|
ld a, c
|
|
cp Ch4
|
|
jr nc, .next
|
|
; If this isn't an SFX channel, try the corresponding SFX channel.
|
|
ld hl, wChannelSoundIDs + Ch4
|
|
add hl, bc
|
|
ld a, [hl]
|
|
and a
|
|
jr nz, .done
|
|
; fall through
|
|
.next
|
|
ld a, c
|
|
cp Ch2
|
|
jr z, .channel3
|
|
cp Ch6
|
|
jr nz, .notChannel3
|
|
.channel3
|
|
ld b, 0
|
|
ld hl, Audio1_HWChannelDisableMasks
|
|
add hl, bc
|
|
ld a, [rNR51]
|
|
and [hl]
|
|
ld [rNR51], a ; disable hardware channel 3's output
|
|
jr .done
|
|
.notChannel3
|
|
ld b, REG_VOLUME_ENVELOPE
|
|
call Audio1_GetRegisterPointer
|
|
ld a, $8 ; fade in sound
|
|
ld [hli], a
|
|
inc hl
|
|
ld a, $80 ; restart sound
|
|
ld [hl], a
|
|
.done
|
|
ret
|
|
.notRest
|
|
swap a
|
|
ld b, 0
|
|
ld hl, wChannelOctaves
|
|
add hl, bc
|
|
ld b, [hl]
|
|
call Audio1_CalculateFrequency
|
|
ld b, 0
|
|
ld hl, wChannelFlags1
|
|
add hl, bc
|
|
bit BIT_PITCH_BEND_ON, [hl]
|
|
jr z, .skipPitchBend
|
|
call Audio1_InitPitchBendVars
|
|
.skipPitchBend
|
|
push de
|
|
ld a, c
|
|
cp Ch4
|
|
jr nc, .sfxChannel ; if sfx channel
|
|
; If this isn't an SFX channel, try the corresponding SFX channel.
|
|
ld hl, wChannelSoundIDs + Ch4
|
|
ld d, 0
|
|
ld e, a
|
|
add hl, de
|
|
ld a, [hl]
|
|
and a
|
|
jr nz, .noSfx
|
|
jr .sfxChannel
|
|
.noSfx
|
|
pop de
|
|
ret
|
|
.sfxChannel
|
|
ld b, 0
|
|
ld hl, wChannelVolumes
|
|
add hl, bc
|
|
ld d, [hl]
|
|
ld b, REG_VOLUME_ENVELOPE
|
|
call Audio1_GetRegisterPointer
|
|
ld [hl], d
|
|
call Audio1_ApplyDutyAndSoundLength
|
|
call Audio1_EnableChannelOutput
|
|
pop de
|
|
ld b, $0
|
|
ld hl, wChannelFlags1
|
|
add hl, bc
|
|
bit BIT_PERFECT_PITCH, [hl] ; has toggleperfectpitch been used?
|
|
jr z, .skipFrequencyInc
|
|
inc e ; if yes, increment the frequency by 1
|
|
jr nc, .skipFrequencyInc
|
|
inc d
|
|
.skipFrequencyInc
|
|
ld hl, wChannelFrequencyLowBytes
|
|
add hl, bc
|
|
ld [hl], e
|
|
call Audio1_ApplyWavePatternAndFrequency
|
|
ret
|
|
|
|
Audio1_EnableChannelOutput:
|
|
ld b, 0
|
|
ld hl, Audio1_HWChannelEnableMasks
|
|
add hl, bc
|
|
ld a, [rNR51]
|
|
or [hl] ; set this channel's bits
|
|
ld d, a
|
|
ld a, c
|
|
cp Ch7
|
|
jr z, .noiseChannelOrNoSfx
|
|
cp Ch4
|
|
jr nc, .skip ; if sfx channel
|
|
; If this isn't an SFX channel, try the corresponding SFX channel.
|
|
ld hl, wChannelSoundIDs + Ch4
|
|
add hl, bc
|
|
ld a, [hl]
|
|
and a
|
|
jr nz, .skip
|
|
.noiseChannelOrNoSfx
|
|
; If this is the SFX noise channel or a music channel whose corresponding
|
|
; SFX channel is off, apply stereo panning.
|
|
ld a, [wStereoPanning]
|
|
ld hl, Audio1_HWChannelEnableMasks
|
|
add hl, bc
|
|
and [hl]
|
|
ld d, a
|
|
ld a, [rNR51]
|
|
ld hl, Audio1_HWChannelDisableMasks
|
|
add hl, bc
|
|
and [hl] ; reset this channel's output bits
|
|
or d ; set this channel's output bits that enabled in [wStereoPanning]
|
|
ld d, a
|
|
.skip
|
|
ld a, d
|
|
ld [rNR51], a
|
|
ret
|
|
|
|
Audio1_ApplyDutyAndSoundLength:
|
|
ld b, 0
|
|
ld hl, wChannelNoteDelayCounters ; use the note delay as sound length
|
|
add hl, bc
|
|
ld d, [hl]
|
|
ld a, c
|
|
cp Ch2
|
|
jr z, .skipDuty ; if music channel 3
|
|
cp Ch6
|
|
jr z, .skipDuty ; if sfx channel 3
|
|
; include duty (except on channel 3 which doesn't have it)
|
|
ld a, d
|
|
and $3f
|
|
ld d, a
|
|
ld hl, wChannelDuties
|
|
add hl, bc
|
|
ld a, [hl]
|
|
or d
|
|
ld d, a
|
|
.skipDuty
|
|
ld b, REG_DUTY_SOUND_LEN
|
|
call Audio1_GetRegisterPointer
|
|
ld [hl], d
|
|
ret
|
|
|
|
Audio1_ApplyWavePatternAndFrequency:
|
|
ld a, c
|
|
cp Ch2
|
|
jr z, .channel3
|
|
cp Ch6
|
|
jr nz, .notChannel3
|
|
; fall through
|
|
.channel3
|
|
push de
|
|
ld de, wMusicWaveInstrument
|
|
cp Ch2
|
|
jr z, .next
|
|
ld de, wSfxWaveInstrument
|
|
.next
|
|
ld a, [de]
|
|
add a
|
|
ld d, 0
|
|
ld e, a
|
|
ld hl, Audio1_WavePointers
|
|
add hl, de
|
|
ld e, [hl]
|
|
inc hl
|
|
ld d, [hl]
|
|
ld hl, $ff30 ; wave pattern RAM
|
|
ld b, $f
|
|
ld a, $0 ; stop hardware channel 3
|
|
ld [rNR30], a
|
|
.loop
|
|
ld a, [de]
|
|
inc de
|
|
ld [hli], a
|
|
ld a, b
|
|
dec b
|
|
and a
|
|
jr nz, .loop
|
|
ld a, $80 ; start hardware channel 3
|
|
ld [rNR30], a
|
|
pop de
|
|
.notChannel3
|
|
ld a, d
|
|
or $80 ; use counter mode (i.e. disable output when the counter reaches 0)
|
|
and $c7 ; zero the unused bits in the register
|
|
ld d, a
|
|
ld b, REG_FREQUENCY_LO
|
|
call Audio1_GetRegisterPointer
|
|
ld [hl], e ; store frequency low byte
|
|
inc hl
|
|
ld [hl], d ; store frequency high byte
|
|
call Audio1_ApplyFrequencyModifier
|
|
ret
|
|
|
|
Audio1_SetSfxTempo:
|
|
call Audio1_IsCry
|
|
jr nc, .notCry
|
|
ld d, 0
|
|
ld a, [wTempoModifier]
|
|
add $80
|
|
jr nc, .next
|
|
inc d
|
|
.next
|
|
ld [wSfxTempo + 1], a
|
|
ld a, d
|
|
ld [wSfxTempo], a
|
|
jr .done
|
|
.notCry
|
|
xor a
|
|
ld [wSfxTempo + 1], a
|
|
ld a, $1
|
|
ld [wSfxTempo], a
|
|
.done
|
|
ret
|
|
|
|
Audio1_ApplyFrequencyModifier:
|
|
call Audio1_IsCry
|
|
jr nc, .done
|
|
; if playing a cry, add the cry's frequency modifier
|
|
ld a, [wFrequencyModifier]
|
|
add e
|
|
jr nc, .noCarry
|
|
inc d
|
|
.noCarry
|
|
dec hl
|
|
ld e, a
|
|
ld [hl], e
|
|
inc hl
|
|
ld [hl], d
|
|
.done
|
|
ret
|
|
|
|
Audio1_GoBackOneCommandIfCry:
|
|
call Audio1_IsCry
|
|
jr nc, .done
|
|
ld hl, wChannelCommandPointers
|
|
ld e, c
|
|
ld d, 0
|
|
sla e
|
|
rl d
|
|
add hl, de
|
|
ld a, [hl]
|
|
sub 1
|
|
ld [hl], a
|
|
inc hl
|
|
ld a, [hl]
|
|
sbc 0
|
|
ld [hl], a
|
|
scf
|
|
ret
|
|
.done
|
|
scf
|
|
ccf
|
|
ret
|
|
|
|
Audio1_IsCry:
|
|
; Returns whether the currently playing audio is a cry in carry.
|
|
ld a, [wChannelSoundIDs + Ch4]
|
|
cp CRY_SFX_START
|
|
jr nc, .next
|
|
jr .no
|
|
.next
|
|
cp CRY_SFX_END
|
|
jr z, .no
|
|
jr c, .yes
|
|
.no
|
|
scf
|
|
ccf
|
|
ret
|
|
.yes
|
|
scf
|
|
ret
|
|
|
|
Audio1_ApplyPitchBend:
|
|
ld hl, wChannelFlags1
|
|
add hl, bc
|
|
bit BIT_PITCH_BEND_DECREASING, [hl]
|
|
jp nz, .frequencyDecreasing
|
|
; frequency increasing
|
|
ld hl, wChannelPitchBendCurrentFrequencyLowBytes
|
|
add hl, bc
|
|
ld e, [hl]
|
|
ld hl, wChannelPitchBendCurrentFrequencyHighBytes
|
|
add hl, bc
|
|
ld d, [hl]
|
|
ld hl, wChannelPitchBendFrequencySteps
|
|
add hl, bc
|
|
ld l, [hl]
|
|
ld h, b
|
|
add hl, de
|
|
ld d, h
|
|
ld e, l
|
|
ld hl, wChannelPitchBendCurrentFrequencyFractionalPart
|
|
add hl, bc
|
|
push hl
|
|
ld hl, wChannelPitchBendFrequencyStepsFractionalPart
|
|
add hl, bc
|
|
ld a, [hl]
|
|
pop hl
|
|
add [hl]
|
|
ld [hl], a
|
|
ld a, 0
|
|
adc e
|
|
ld e, a
|
|
ld a, 0
|
|
adc d
|
|
ld d, a
|
|
ld hl, wChannelPitchBendTargetFrequencyHighBytes
|
|
add hl, bc
|
|
ld a, [hl]
|
|
cp d
|
|
jp c, .reachedTargetFrequency
|
|
jr nz, .applyUpdatedFrequency
|
|
ld hl, wChannelPitchBendTargetFrequencyLowBytes
|
|
add hl, bc
|
|
ld a, [hl]
|
|
cp e
|
|
jp c, .reachedTargetFrequency
|
|
jr .applyUpdatedFrequency
|
|
.frequencyDecreasing
|
|
ld hl, wChannelPitchBendCurrentFrequencyLowBytes
|
|
add hl, bc
|
|
ld a, [hl]
|
|
ld hl, wChannelPitchBendCurrentFrequencyHighBytes
|
|
add hl, bc
|
|
ld d, [hl]
|
|
ld hl, wChannelPitchBendFrequencySteps
|
|
add hl, bc
|
|
ld e, [hl]
|
|
sub e
|
|
ld e, a
|
|
ld a, d
|
|
sbc b
|
|
ld d, a
|
|
ld hl, wChannelPitchBendFrequencyStepsFractionalPart
|
|
add hl, bc
|
|
ld a, [hl]
|
|
add a
|
|
ld [hl], a
|
|
ld a, e
|
|
sbc b
|
|
ld e, a
|
|
ld a, d
|
|
sbc b
|
|
ld d, a
|
|
ld hl, wChannelPitchBendTargetFrequencyHighBytes
|
|
add hl, bc
|
|
ld a, d
|
|
cp [hl]
|
|
jr c, .reachedTargetFrequency
|
|
jr nz, .applyUpdatedFrequency
|
|
ld hl, wChannelPitchBendTargetFrequencyLowBytes
|
|
add hl, bc
|
|
ld a, e
|
|
cp [hl]
|
|
jr c, .reachedTargetFrequency
|
|
.applyUpdatedFrequency
|
|
ld hl, wChannelPitchBendCurrentFrequencyLowBytes
|
|
add hl, bc
|
|
ld [hl], e
|
|
ld hl, wChannelPitchBendCurrentFrequencyHighBytes
|
|
add hl, bc
|
|
ld [hl], d
|
|
ld b, REG_FREQUENCY_LO
|
|
call Audio1_GetRegisterPointer
|
|
ld a, e
|
|
ld [hli], a
|
|
ld [hl], d
|
|
ret
|
|
.reachedTargetFrequency
|
|
; Turn off pitch bend when the target frequency has been reached.
|
|
ld hl, wChannelFlags1
|
|
add hl, bc
|
|
res BIT_PITCH_BEND_ON, [hl]
|
|
res BIT_PITCH_BEND_DECREASING, [hl]
|
|
ret
|
|
|
|
Audio1_InitPitchBendVars:
|
|
ld hl, wChannelPitchBendCurrentFrequencyHighBytes
|
|
add hl, bc
|
|
ld [hl], d
|
|
ld hl, wChannelPitchBendCurrentFrequencyLowBytes
|
|
add hl, bc
|
|
ld [hl], e
|
|
ld hl, wChannelNoteDelayCounters
|
|
add hl, bc
|
|
ld a, [hl]
|
|
ld hl, wChannelPitchBendLengthModifiers
|
|
add hl, bc
|
|
sub [hl]
|
|
jr nc, .next
|
|
ld a, 1
|
|
.next
|
|
ld [hl], a
|
|
ld hl, wChannelPitchBendTargetFrequencyLowBytes
|
|
add hl, bc
|
|
ld a, e
|
|
sub [hl]
|
|
ld e, a
|
|
ld a, d
|
|
sbc b
|
|
ld hl, wChannelPitchBendTargetFrequencyHighBytes
|
|
add hl, bc
|
|
sub [hl]
|
|
jr c, .targetFrequencyGreater
|
|
ld d, a
|
|
ld b, 0
|
|
ld hl, wChannelFlags1
|
|
add hl, bc
|
|
set BIT_PITCH_BEND_DECREASING, [hl]
|
|
jr .next2
|
|
.targetFrequencyGreater
|
|
; If the target frequency is greater, subtract the current frequency from
|
|
; the target frequency to get the absolute difference.
|
|
ld hl, wChannelPitchBendCurrentFrequencyHighBytes
|
|
add hl, bc
|
|
ld d, [hl]
|
|
ld hl, wChannelPitchBendCurrentFrequencyLowBytes
|
|
add hl, bc
|
|
ld e, [hl]
|
|
ld hl, wChannelPitchBendTargetFrequencyLowBytes
|
|
add hl, bc
|
|
ld a, [hl]
|
|
sub e
|
|
ld e, a
|
|
|
|
; Bug. Instead of borrowing from the high byte of the target frequency as it
|
|
; should, it borrows from the high byte of the current frequency instead.
|
|
; This means that the result will be 0x200 greater than it should be if the
|
|
; low byte of the current frequency is greater than the low byte of the
|
|
; target frequency.
|
|
ld a, d
|
|
sbc b
|
|
ld d, a
|
|
|
|
ld hl, wChannelPitchBendTargetFrequencyHighBytes
|
|
add hl, bc
|
|
ld a, [hl]
|
|
sub d
|
|
ld d, a
|
|
ld b, 0
|
|
ld hl, wChannelFlags1
|
|
add hl, bc
|
|
res BIT_PITCH_BEND_DECREASING, [hl]
|
|
|
|
.next2
|
|
ld hl, wChannelPitchBendLengthModifiers
|
|
add hl, bc
|
|
.divideLoop
|
|
inc b
|
|
ld a, e
|
|
sub [hl]
|
|
ld e, a
|
|
jr nc, .divideLoop
|
|
ld a, d
|
|
and a
|
|
jr z, .doneDividing
|
|
dec a
|
|
ld d, a
|
|
jr .divideLoop
|
|
.doneDividing
|
|
ld a, e ; a = remainder - dividend
|
|
add [hl]
|
|
ld d, b ; d = quotient + 1
|
|
ld b, 0
|
|
ld hl, wChannelPitchBendFrequencySteps
|
|
add hl, bc
|
|
ld [hl], d ; store quotient + 1
|
|
ld hl, wChannelPitchBendFrequencyStepsFractionalPart
|
|
add hl, bc
|
|
ld [hl], a ; store remainder - dividend
|
|
ld hl, wChannelPitchBendCurrentFrequencyFractionalPart
|
|
add hl, bc
|
|
ld [hl], a ; store remainder - dividend
|
|
ret
|
|
|
|
Audio1_ApplyDutyCycle:
|
|
ld b, 0
|
|
ld hl, wChannelDutyCycles
|
|
add hl, bc
|
|
ld a, [hl]
|
|
rlca
|
|
rlca
|
|
ld [hl], a
|
|
and $c0
|
|
ld d, a
|
|
ld b, REG_DUTY_SOUND_LEN
|
|
call Audio1_GetRegisterPointer
|
|
ld a, [hl]
|
|
and $3f
|
|
or d
|
|
ld [hl], a
|
|
ret
|
|
|
|
Audio1_GetNextMusicByte:
|
|
ld d, 0
|
|
ld a, c
|
|
add a
|
|
ld e, a
|
|
ld hl, wChannelCommandPointers
|
|
add hl, de
|
|
ld a, [hli]
|
|
ld e, a
|
|
ld a, [hld]
|
|
ld d, a
|
|
ld a, [de] ; get next music command
|
|
inc de
|
|
ld [hl], e ; store address of next command
|
|
inc hl
|
|
ld [hl], d
|
|
ret
|
|
|
|
Audio1_GetRegisterPointer:
|
|
; hl = address of hardware sound register b for software channel c
|
|
ld a, c
|
|
ld hl, Audio1_HWChannelBaseAddresses
|
|
add l
|
|
jr nc, .noCarry
|
|
inc h
|
|
.noCarry
|
|
ld l, a
|
|
ld a, [hl]
|
|
add b
|
|
ld l, a
|
|
ld h, $ff
|
|
ret
|
|
|
|
Audio1_MultiplyAdd:
|
|
; hl = l + (a * de)
|
|
ld h, 0
|
|
.loop
|
|
srl a
|
|
jr nc, .skipAdd
|
|
add hl, de
|
|
.skipAdd
|
|
sla e
|
|
rl d
|
|
and a
|
|
jr z, .done
|
|
jr .loop
|
|
.done
|
|
ret
|
|
|
|
Audio1_CalculateFrequency:
|
|
; return the frequency for note a, octave b in de
|
|
ld h, 0
|
|
ld l, a
|
|
add hl, hl
|
|
ld d, h
|
|
ld e, l
|
|
ld hl, Audio1_Pitches
|
|
add hl, de
|
|
ld e, [hl]
|
|
inc hl
|
|
ld d, [hl]
|
|
ld a, b
|
|
.loop
|
|
cp 7
|
|
jr z, .done
|
|
sra d
|
|
rr e
|
|
inc a
|
|
jr .loop
|
|
.done
|
|
ld a, 8
|
|
add d
|
|
ld d, a
|
|
ret
|
|
|
|
Audio1_PlaySound::
|
|
ld [wSoundID], a
|
|
cp $ff
|
|
jp z, .stopAllAudio
|
|
cp MAX_SFX_ID
|
|
jp z, .playSfx
|
|
jp c, .playSfx
|
|
cp $fe
|
|
jr z, .playMusic
|
|
jp nc, .playSfx
|
|
|
|
.playMusic
|
|
xor a
|
|
ld [wUnusedC000], a
|
|
ld [wDisableChannelOutputWhenSfxEnds], a
|
|
ld [wMusicTempo + 1], a
|
|
ld [wMusicWaveInstrument], a
|
|
ld [wSfxWaveInstrument], a
|
|
ld d, $8
|
|
ld hl, wChannelReturnAddresses
|
|
call .FillMem
|
|
ld hl, wChannelCommandPointers
|
|
call .FillMem
|
|
ld d, $4
|
|
ld hl, wChannelSoundIDs
|
|
call .FillMem
|
|
ld hl, wChannelFlags1
|
|
call .FillMem
|
|
ld hl, wChannelDuties
|
|
call .FillMem
|
|
ld hl, wChannelDutyCycles
|
|
call .FillMem
|
|
ld hl, wChannelVibratoDelayCounters
|
|
call .FillMem
|
|
ld hl, wChannelVibratoExtents
|
|
call .FillMem
|
|
ld hl, wChannelVibratoRates
|
|
call .FillMem
|
|
ld hl, wChannelFrequencyLowBytes
|
|
call .FillMem
|
|
ld hl, wChannelVibratoDelayCounterReloadValues
|
|
call .FillMem
|
|
ld hl, wChannelFlags2
|
|
call .FillMem
|
|
ld hl, wChannelPitchBendLengthModifiers
|
|
call .FillMem
|
|
ld hl, wChannelPitchBendFrequencySteps
|
|
call .FillMem
|
|
ld hl, wChannelPitchBendFrequencyStepsFractionalPart
|
|
call .FillMem
|
|
ld hl, wChannelPitchBendCurrentFrequencyFractionalPart
|
|
call .FillMem
|
|
ld hl, wChannelPitchBendCurrentFrequencyHighBytes
|
|
call .FillMem
|
|
ld hl, wChannelPitchBendCurrentFrequencyLowBytes
|
|
call .FillMem
|
|
ld hl, wChannelPitchBendTargetFrequencyHighBytes
|
|
call .FillMem
|
|
ld hl, wChannelPitchBendTargetFrequencyLowBytes
|
|
call .FillMem
|
|
ld a, $1
|
|
ld hl, wChannelLoopCounters
|
|
call .FillMem
|
|
ld hl, wChannelNoteDelayCounters
|
|
call .FillMem
|
|
ld hl, wChannelNoteSpeeds
|
|
call .FillMem
|
|
ld [wMusicTempo], a
|
|
ld a, $ff
|
|
ld [wStereoPanning], a
|
|
xor a
|
|
ld [rNR50], a
|
|
ld a, $8
|
|
ld [rNR10], a
|
|
ld a, 0
|
|
ld [rNR51], a
|
|
xor a
|
|
ld [rNR30], a
|
|
ld a, $80
|
|
ld [rNR30], a
|
|
ld a, $77
|
|
ld [rNR50], a
|
|
jp .playSoundCommon
|
|
|
|
.playSfx
|
|
ld l, a
|
|
ld e, a
|
|
ld h, 0
|
|
ld d, h
|
|
add hl, hl
|
|
add hl, de
|
|
ld de, SFX_Headers_1
|
|
add hl, de
|
|
ld a, h
|
|
ld [wSfxHeaderPointer], a
|
|
ld a, l
|
|
ld [wSfxHeaderPointer + 1], a
|
|
ld a, [hl]
|
|
and $c0
|
|
rlca
|
|
rlca
|
|
ld c, a
|
|
.sfxChannelLoop
|
|
ld d, c
|
|
ld a, c
|
|
add a
|
|
add c
|
|
ld c, a
|
|
ld b, 0
|
|
ld a, [wSfxHeaderPointer]
|
|
ld h, a
|
|
ld a, [wSfxHeaderPointer + 1]
|
|
ld l, a
|
|
add hl, bc
|
|
ld c, d
|
|
ld a, [hl]
|
|
and $f
|
|
ld e, a ; software channel ID
|
|
ld d, 0
|
|
ld hl, wChannelSoundIDs
|
|
add hl, de
|
|
ld a, [hl]
|
|
and a
|
|
jr z, .asm_99a3
|
|
ld a, e
|
|
cp $7
|
|
jr nz, .asm_999a
|
|
ld a, [wSoundID]
|
|
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, [wSoundID]
|
|
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, wChannelReturnAddresses
|
|
add hl, de
|
|
ld [hli], a
|
|
ld [hl], a
|
|
ld hl, wChannelCommandPointers
|
|
add hl, de
|
|
ld [hli], a
|
|
ld [hl], a
|
|
pop de
|
|
ld hl, wChannelSoundIDs
|
|
add hl, de
|
|
ld [hl], a
|
|
ld hl, wChannelFlags1
|
|
add hl, de
|
|
ld [hl], a
|
|
ld hl, wChannelDuties
|
|
add hl, de
|
|
ld [hl], a
|
|
ld hl, wChannelDutyCycles
|
|
add hl, de
|
|
ld [hl], a
|
|
ld hl, wChannelVibratoDelayCounters
|
|
add hl, de
|
|
ld [hl], a
|
|
ld hl, wChannelVibratoExtents
|
|
add hl, de
|
|
ld [hl], a
|
|
ld hl, wChannelVibratoRates
|
|
add hl, de
|
|
ld [hl], a
|
|
ld hl, wChannelFrequencyLowBytes
|
|
add hl, de
|
|
ld [hl], a
|
|
ld hl, wChannelVibratoDelayCounterReloadValues
|
|
add hl, de
|
|
ld [hl], a
|
|
ld hl, wChannelPitchBendLengthModifiers
|
|
add hl, de
|
|
ld [hl], a
|
|
ld hl, wChannelPitchBendFrequencySteps
|
|
add hl, de
|
|
ld [hl], a
|
|
ld hl, wChannelPitchBendFrequencyStepsFractionalPart
|
|
add hl, de
|
|
ld [hl], a
|
|
ld hl, wChannelPitchBendCurrentFrequencyFractionalPart
|
|
add hl, de
|
|
ld [hl], a
|
|
ld hl, wChannelPitchBendCurrentFrequencyHighBytes
|
|
add hl, de
|
|
ld [hl], a
|
|
ld hl, wChannelPitchBendCurrentFrequencyLowBytes
|
|
add hl, de
|
|
ld [hl], a
|
|
ld hl, wChannelPitchBendTargetFrequencyHighBytes
|
|
add hl, de
|
|
ld [hl], a
|
|
ld hl, wChannelPitchBendTargetFrequencyLowBytes
|
|
add hl, de
|
|
ld [hl], a
|
|
ld hl, wChannelFlags2
|
|
add hl, de
|
|
ld [hl], a
|
|
ld a, $1
|
|
ld hl, wChannelLoopCounters
|
|
add hl, de
|
|
ld [hl], a
|
|
ld hl, wChannelNoteDelayCounters
|
|
add hl, de
|
|
ld [hl], a
|
|
ld hl, wChannelNoteSpeeds
|
|
add hl, de
|
|
ld [hl], a
|
|
ld a, e
|
|
cp Ch4
|
|
jr nz, .asm_9a2b
|
|
ld a, $8
|
|
ld [rNR10], a ; sweep off
|
|
.asm_9a2b
|
|
ld a, c
|
|
and a
|
|
jp z, .playSoundCommon
|
|
dec c
|
|
jp .sfxChannelLoop
|
|
|
|
.stopAllAudio
|
|
ld a, $80
|
|
ld [rNR52], a ; sound hardware on
|
|
ld [rNR30], a ; wave playback on
|
|
xor a
|
|
ld [rNR51], a ; no sound output
|
|
ld [rNR32], a ; mute channel 3 (wave channel)
|
|
ld a, $8
|
|
ld [rNR10], a ; sweep off
|
|
ld [rNR12], a ; mute channel 1 (pulse channel 1)
|
|
ld [rNR22], a ; mute channel 2 (pulse channel 2)
|
|
ld [rNR42], a ; mute channel 4 (noise channel)
|
|
ld a, $40
|
|
ld [rNR14], a ; counter mode
|
|
ld [rNR24], a
|
|
ld [rNR44], a
|
|
ld a, $77
|
|
ld [rNR50], a ; full volume
|
|
xor a
|
|
ld [wUnusedC000], a
|
|
ld [wDisableChannelOutputWhenSfxEnds], a
|
|
ld [wMuteAudioAndPauseMusic], a
|
|
ld [wMusicTempo + 1], a
|
|
ld [wSfxTempo + 1], a
|
|
ld [wMusicWaveInstrument], a
|
|
ld [wSfxWaveInstrument], a
|
|
ld d, $a0
|
|
ld hl, wChannelCommandPointers
|
|
call .FillMem
|
|
ld a, $1
|
|
ld d, $18
|
|
ld hl, wChannelNoteDelayCounters
|
|
call .FillMem
|
|
ld [wMusicTempo], a
|
|
ld [wSfxTempo], a
|
|
ld a, $ff
|
|
ld [wStereoPanning], a
|
|
ret
|
|
|
|
; fills d bytes at hl with a
|
|
.FillMem
|
|
ld b, d
|
|
.loop
|
|
ld [hli], a
|
|
dec b
|
|
jr nz, .loop
|
|
ret
|
|
|
|
.playSoundCommon
|
|
ld a, [wSoundID]
|
|
ld l, a
|
|
ld e, a
|
|
ld h, 0
|
|
ld d, h
|
|
add hl, hl
|
|
add hl, de
|
|
ld de, SFX_Headers_1
|
|
add hl, de
|
|
ld e, l
|
|
ld d, h
|
|
ld hl, wChannelCommandPointers
|
|
ld a, [de] ; get channel number
|
|
ld b, a
|
|
rlca
|
|
rlca
|
|
and $3
|
|
ld c, a
|
|
ld a, b
|
|
and $f
|
|
ld b, c
|
|
inc b
|
|
inc de
|
|
ld c, 0
|
|
.commandPointerLoop
|
|
cp c
|
|
jr z, .next
|
|
inc c
|
|
inc hl
|
|
inc hl
|
|
jr .commandPointerLoop
|
|
.next
|
|
push hl
|
|
push bc
|
|
push af
|
|
ld b, 0
|
|
ld c, a
|
|
ld hl, wChannelSoundIDs
|
|
add hl, bc
|
|
ld a, [wSoundID]
|
|
ld [hl], a
|
|
pop af
|
|
cp Ch3
|
|
jr c, .skipSettingFlag
|
|
ld hl, wChannelFlags1
|
|
add hl, bc
|
|
set BIT_NOISE_OR_SFX, [hl]
|
|
.skipSettingFlag
|
|
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, .commandPointerLoop
|
|
ld a, [wSoundID]
|
|
cp CRY_SFX_START
|
|
jr nc, .asm_9aeb
|
|
jr .done
|
|
.asm_9aeb
|
|
ld a, [wSoundID]
|
|
cp CRY_SFX_END
|
|
jr z, .done
|
|
jr c, .cry
|
|
jr .done
|
|
.cry
|
|
ld hl, wChannelSoundIDs + Ch4
|
|
ld [hli], a
|
|
ld [hli], a
|
|
ld [hli], a
|
|
ld [hl], a
|
|
ld hl, wChannelCommandPointers + Ch6 * 2 ; sfx wave channel pointer
|
|
ld de, Audio1_CryEndchannel
|
|
ld [hl], e
|
|
inc hl
|
|
ld [hl], d ; overwrite pointer to point to endchannel
|
|
ld a, [wSavedVolume]
|
|
and a
|
|
jr nz, .done
|
|
ld a, [rNR50]
|
|
ld [wSavedVolume], a
|
|
ld a, $77
|
|
ld [rNR50], a ; full volume
|
|
.done
|
|
ret
|
|
|
|
Audio1_CryEndchannel:
|
|
endchannel
|
|
|
|
Audio1_HWChannelBaseAddresses:
|
|
; the low bytes of each HW channel's base address
|
|
db HW_CH1_BASE, HW_CH2_BASE, HW_CH3_BASE, HW_CH4_BASE ; channels 0-3
|
|
db HW_CH1_BASE, HW_CH2_BASE, HW_CH3_BASE, HW_CH4_BASE ; channels 4-7
|
|
|
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Audio1_HWChannelDisableMasks:
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db HW_CH1_DISABLE_MASK, HW_CH2_DISABLE_MASK, HW_CH3_DISABLE_MASK, HW_CH4_DISABLE_MASK ; channels 0-3
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db HW_CH1_DISABLE_MASK, HW_CH2_DISABLE_MASK, HW_CH3_DISABLE_MASK, HW_CH4_DISABLE_MASK ; channels 4-7
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Audio1_HWChannelEnableMasks:
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db HW_CH1_ENABLE_MASK, HW_CH2_ENABLE_MASK, HW_CH3_ENABLE_MASK, HW_CH4_ENABLE_MASK ; channels 0-3
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db HW_CH1_ENABLE_MASK, HW_CH2_ENABLE_MASK, HW_CH3_ENABLE_MASK, HW_CH4_ENABLE_MASK ; channels 4-7
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Audio1_Pitches:
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dw $F82C ; C_
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dw $F89D ; C#
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dw $F907 ; D_
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dw $F96B ; D#
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dw $F9CA ; E_
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dw $FA23 ; F_
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dw $FA77 ; F#
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dw $FAC7 ; G_
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dw $FB12 ; G#
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dw $FB58 ; A_
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dw $FB9B ; A#
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dw $FBDA ; B_
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