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Enigma Amiga Life 109
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music.s
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1995-10-23
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22KB
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1,156 lines
;**************************************************
;* ----- Protracker V2.1A Playroutine ----- *
;* Peter "CRAYON" Hanning / Mushroom Studios 1992 *
;* Vinterstigen 12, 14440 Ronninge, Sweden *
;* *
;* Fixata 100% by Fabio "Randy" Ciucci /Ram Jam *
;**************************************************
n_note EQU 0 ; W
n_cmd EQU 2 ; W
n_cmdlo EQU 3 ; B
n_start EQU 4 ; L
n_length EQU 8 ; W
n_loopstart EQU 10 ; L
n_replen EQU 14 ; W
n_period EQU 16 ; W
n_finetune EQU 18 ; B
n_volume EQU 19 ; B
n_dmabit EQU 20 ; W
n_toneportdirec EQU 22 ; B
n_toneportspeed EQU 23 ; B
n_wantedperiod EQU 24 ; W
n_vibratocmd EQU 26 ; B
n_vibratopos EQU 27 ; B
n_tremolocmd EQU 28 ; B
n_tremolopos EQU 29 ; B
n_wavecontrol EQU 30 ; B
n_glissfunk EQU 31 ; B
n_sampleoffset EQU 32 ; B
n_pattpos EQU 33 ; B
n_loopcount EQU 34 ; B
n_funkoffset EQU 35 ; B
n_wavestart EQU 36 ; L
n_reallength EQU 40 ; W
mt_init:
move.l mt_data,A0
MOVE.L A0,mt_SongDataPtr
MOVE.L A0,A1
LEA 952(A1),A1
MOVEQ #127,D0
MOVEQ #0,D1
mtloop:
MOVE.L D1,D2
SUBQ.W #1,D0
mtloop2:
MOVE.B (A1)+,D1
CMP.B D2,D1
BGT.S mtloop
DBRA D0,mtloop2
ADDQ.B #1,D2
LEA mt_SampleStarts(PC),A1
ASL.L #8,D2
ASL.L #2,D2
ADD.L #1084,D2
ADD.L A0,D2
MOVE.L D2,A2
MOVEQ #30,D0
mtloop3:
; CLR.L (A2) ; merda, a volte cleara fuori area!!
MOVE.L A2,(A1)+
MOVEQ #0,D1
MOVE.W 42(A0),D1
ASL.L #1,D1
ADD.L D1,A2
ADD.w #30,A0
DBRA D0,mtloop3
OR.B #2,$BFE001
MOVE.B #6,mt_speed
CLR.B mt_counter
CLR.B mt_SongPos
CLR.W mt_PatternPos
mt_end:
CLR.W $DFF0A8
CLR.W $DFF0B8
CLR.W $DFF0C8
CLR.W $DFF0D8
MOVE.W #$F,$DFF096
RTS
mt_music:
MOVEM.L D0-D4/A0-A6,-(SP)
ADDQ.B #1,mt_counter
MOVE.B mt_counter(PC),D0
CMP.B mt_speed(PC),D0
BLO.S mt_NoNewNote
CLR.B mt_counter
TST.B mt_PattDelTime2
BEQ.S mt_GetNewNote
BSR.S mt_NoNewAllChannels
BRA.w mt_dskip
mt_NoNewNote:
BSR.S mt_NoNewAllChannels
BRA.w mt_NoNewPosYet
mt_NoNewAllChannels:
LEA $DFF0A0,A5
LEA mt_chan1temp(PC),A6
BSR.w mt_CheckEfx
LEA $DFF0B0,A5
LEA mt_chan2temp(PC),A6
BSR.w mt_CheckEfx
LEA $DFF0C0,A5
LEA mt_chan3temp(PC),A6
BSR.w mt_CheckEfx
LEA $DFF0D0,A5
LEA mt_chan4temp(PC),A6
BRA.w mt_CheckEfx
mt_GetNewNote:
MOVE.L mt_SongDataPtr(PC),A0
LEA 12(A0),A3
LEA 952(A0),A2 ;pattpo
LEA 1084(A0),A0 ;patterndata
MOVEQ #0,D0
MOVEQ #0,D1
MOVE.B mt_SongPos(PC),D0
MOVE.B (A2,D0.W),D1
ASL.L #8,D1
ASL.L #2,D1
ADD.W mt_PatternPos(PC),D1
CLR.W mt_DMACONtemp
LEA $DFF0A0,A5
LEA mt_chan1temp(PC),A6
BSR.S mt_PlayVoice
LEA $DFF0B0,A5
LEA mt_chan2temp(PC),A6
BSR.S mt_PlayVoice
LEA $DFF0C0,A5
LEA mt_chan3temp(PC),A6
BSR.S mt_PlayVoice
LEA $DFF0D0,A5
LEA mt_chan4temp(PC),A6
BSR.S mt_PlayVoice
BRA.w mt_SetDMA
mt_PlayVoice:
TST.L (A6)
BNE.S mt_plvskip
BSR.w mt_PerNop
mt_plvskip:
MOVE.L (A0,D1.L),(A6)
ADDQ.L #4,D1
MOVEQ #0,D2
MOVE.B n_cmd(A6),D2
AND.B #$F0,D2
LSR.B #4,D2
MOVE.B (A6),D0
AND.B #$F0,D0
OR.B D0,D2
; TST.B D2
BEQ.w mt_SetRegs
MOVEQ #0,D3
LEA mt_SampleStarts(PC),A1
MOVE D2,D4
SUBQ.L #1,D2
ASL.L #2,D2
MULU.w #30,D4
MOVE.L (A1,D2.L),n_start(A6)
MOVE.W (A3,D4.L),n_length(A6)
MOVE.W (A3,D4.L),n_reallength(A6)
MOVE.B 2(A3,D4.L),n_finetune(A6)
MOVE.B 3(A3,D4.L),n_volume(A6)
MOVE.W 4(A3,D4.L),D3 ; Get repeat
; TST.W D3
BEQ.S mt_NoLoop
MOVE.L n_start(A6),D2 ; Get start
add.w d3,d3
ADD.L D3,D2 ; Add repeat
MOVE.L D2,n_loopstart(A6)
MOVE.L D2,n_wavestart(A6)
MOVE.W 4(A3,D4.L),D0 ; Get repeat
ADD.W 6(A3,D4.L),D0 ; Add replen
MOVE.W D0,n_length(A6)
MOVE.W 6(A3,D4.L),n_replen(A6) ; Save replen
MOVEQ #0,D0
MOVE.B n_volume(A6),D0
MOVE.W D0,8(A5) ; Set volume
BRA.S mt_SetRegs
mt_NoLoop:
MOVE.L n_start(A6),D2
ADD.L D3,D2
MOVE.L D2,n_loopstart(A6)
MOVE.L D2,n_wavestart(A6)
MOVE.W 6(A3,D4.L),n_replen(A6) ; Save replen
MOVEQ #0,D0
MOVE.B n_volume(A6),D0
MOVE.W D0,8(A5) ; Set volume
mt_SetRegs:
MOVE.W (A6),D0
AND.W #$0FFF,D0
BEQ.w mt_CheckMoreEfx ; If no note
MOVE.W 2(A6),D0
AND.W #$0FF0,D0
CMP.W #$0E50,D0
BEQ.S mt_DoSetFineTune
MOVE.B 2(A6),D0
AND.B #$0F,D0
CMP.B #3,D0 ; TonePortamento
BEQ.S mt_ChkTonePorta
CMP.B #5,D0
BEQ.S mt_ChkTonePorta
CMP.B #9,D0 ; Sample Offset
BNE.S mt_SetPeriod
BSR.w mt_CheckMoreEfx
BRA.S mt_SetPeriod
mt_DoSetFineTune:
BSR.w mt_SetFineTune
BRA.S mt_SetPeriod
mt_ChkTonePorta:
BSR.w mt_SetTonePorta
BRA.w mt_CheckMoreEfx
mt_SetPeriod:
MOVEM.L D0-D1/A0-A1,-(SP)
MOVE.W (A6),D1
AND.W #$0FFF,D1
LEA mt_PeriodTable(PC),A1
MOVEQ #0,D0
MOVEQ #36,D7
mt_ftuloop:
CMP.W (A1,D0.W),D1
BHS.S mt_ftufound
ADDQ.L #2,D0
DBRA D7,mt_ftuloop
mt_ftufound:
MOVEQ #0,D1
MOVE.B n_finetune(A6),D1
MULU.w #36*2,D1
ADD.L D1,A1
MOVE.W (A1,D0.W),n_period(A6)
MOVEM.L (SP)+,D0-D1/A0-A1
MOVE.W 2(A6),D0
AND.W #$0FF0,D0
CMP.W #$0ED0,D0 ; Notedelay
BEQ.w mt_CheckMoreEfx
MOVE.W n_dmabit(A6),$DFF096
BTST #2,n_wavecontrol(A6)
BNE.S mt_vibnoc
CLR.B n_vibratopos(A6)
mt_vibnoc:
BTST #6,n_wavecontrol(A6)
BNE.S mt_trenoc
CLR.B n_tremolopos(A6)
mt_trenoc:
MOVE.L n_start(A6),(A5) ; Set start
MOVE.W n_length(A6),4(A5) ; Set length
MOVE.W n_period(A6),D0
MOVE.W D0,6(A5) ; Set period
MOVE.W n_dmabit(A6),D0
OR.W D0,mt_DMACONtemp
BRA.w mt_CheckMoreEfx
WaitaDMA:
move.l d1,-(SP)
moveq #5,d0
mt_wai2:
move.b $DFF006,d1
mt_wai3:
cmp.b $DFF006,d1
beq.s mt_wai3
dbra d0,mt_wai2
move.l (SP)+,d1
rts
mt_SetDMA:
bsr.s WaitaDMA
MOVE.W mt_DMACONtemp(PC),D0
OR.W #$8000,D0
MOVE.W D0,$DFF096
bsr.s WaitaDMA
LEA $DFF000,A5
LEA mt_chan4temp(PC),A6
MOVE.L n_loopstart(A6),$D0(A5)
MOVE.W n_replen(A6),$D4(A5)
LEA mt_chan3temp(PC),A6
MOVE.L n_loopstart(A6),$C0(A5)
MOVE.W n_replen(A6),$C4(A5)
LEA mt_chan2temp(PC),A6
MOVE.L n_loopstart(A6),$B0(A5)
MOVE.W n_replen(A6),$B4(A5)
LEA mt_chan1temp(PC),A6
MOVE.L n_loopstart(A6),$A0(A5)
MOVE.W n_replen(A6),$A4(A5)
mt_dskip:
ADD.W #16,mt_PatternPos
MOVE.B mt_PattDelTime(PC),D0
BEQ.S mt_dskc
MOVE.B D0,mt_PattDelTime2
CLR.B mt_PattDelTime
mt_dskc:
TST.B mt_PattDelTime2
BEQ.S mt_dska
SUBQ.B #1,mt_PattDelTime2
BEQ.S mt_dska
SUB.W #16,mt_PatternPos
mt_dska:
TST.B mt_PBreakFlag
BEQ.S mt_nnpysk
SF mt_PBreakFlag
MOVEQ #0,D0
MOVE.B mt_PBreakPos(PC),D0
CLR.B mt_PBreakPos
LSL.W #4,D0
MOVE.W D0,mt_PatternPos
mt_nnpysk:
CMP.W #1024,mt_PatternPos
BLO.S mt_NoNewPosYet
mt_NextPosition:
MOVEQ #0,D0
MOVE.B mt_PBreakPos(PC),D0
LSL.W #4,D0
MOVE.W D0,mt_PatternPos
CLR.B mt_PBreakPos
CLR.B mt_PosJumpFlag
ADDQ.B #1,mt_SongPos
AND.B #$7F,mt_SongPos
MOVE.B mt_SongPos(PC),D1
MOVE.L mt_SongDataPtr(PC),A0
CMP.B 950(A0),D1
BLO.S mt_NoNewPosYet
CLR.B mt_SongPos
mt_NoNewPosYet:
TST.B mt_PosJumpFlag
BNE.S mt_NextPosition
MOVEM.L (SP)+,D0-D4/A0-A6
RTS
mt_CheckEfx:
BSR.w mt_UpdateFunk
MOVE.W n_cmd(A6),D0
AND.W #$0FFF,D0
BEQ.S mt_PerNop
MOVE.B n_cmd(A6),D0
AND.B #$0F,D0
BEQ.S mt_Arpeggio
CMP.B #1,D0
BEQ.w mt_PortaUp
CMP.B #2,D0
BEQ.w mt_PortaDown
CMP.B #3,D0
BEQ.w mt_TonePortamento
CMP.B #4,D0
BEQ.w mt_Vibrato
CMP.B #5,D0
BEQ.w mt_TonePlusVolSlide
CMP.B #6,D0
BEQ.w mt_VibratoPlusVolSlide
CMP.B #$E,D0
BEQ.w mt_E_Commands
SetBack:
MOVE.W n_period(A6),6(A5)
CMP.B #7,D0
BEQ.w mt_Tremolo
CMP.B #$A,D0
BEQ.w mt_VolumeSlide
mt_Return2:
RTS
mt_PerNop:
MOVE.W n_period(A6),6(A5)
RTS
mt_Arpeggio:
MOVEQ #0,D0
MOVE.B mt_counter(PC),D0
DIVS.w #3,D0
SWAP D0
TST.W D0
BEQ.S mt_Arpeggio2
CMP.W #2,D0
BEQ.S mt_Arpeggio1
MOVEQ #0,D0
MOVE.B n_cmdlo(A6),D0
LSR.B #4,D0
BRA.S mt_Arpeggio3
mt_Arpeggio1:
MOVEQ #0,D0
MOVE.B n_cmdlo(A6),D0
AND.B #15,D0
BRA.S mt_Arpeggio3
mt_Arpeggio2:
MOVE.W n_period(A6),D2
BRA.S mt_Arpeggio4
mt_Arpeggio3:
add.w d0,d0
MOVEQ #0,D1
MOVE.B n_finetune(A6),D1
MULU.w #36*2,D1
LEA mt_PeriodTable(PC),A0
ADD.L D1,A0
MOVEQ #0,D1
MOVE.W n_period(A6),D1
MOVEQ #36,D7
mt_arploop:
MOVE.W (A0,D0.W),D2
CMP.W (A0),D1
BHS.S mt_Arpeggio4
ADDQ.w #2,A0
DBRA D7,mt_arploop
RTS
mt_Arpeggio4:
MOVE.W D2,6(A5)
RTS
mt_FinePortaUp:
TST.B mt_counter
BNE.S mt_Return2
MOVE.B #$0F,mt_LowMask
mt_PortaUp:
MOVEQ #0,D0
MOVE.B n_cmdlo(A6),D0
AND.B mt_LowMask(PC),D0
st.B mt_LowMask
SUB.W D0,n_period(A6)
MOVE.W n_period(A6),D0
AND.W #$0FFF,D0
CMP.W #113,D0
BPL.S mt_PortaUskip
AND.W #$F000,n_period(A6)
OR.W #113,n_period(A6)
mt_PortaUskip:
MOVE.W n_period(A6),D0
AND.W #$0FFF,D0
MOVE.W D0,6(A5)
RTS
mt_FinePortaDown:
TST.B mt_counter
BNE.w mt_Return2
MOVE.B #$0F,mt_LowMask
mt_PortaDown:
CLR.W D0
MOVE.B n_cmdlo(A6),D0
AND.B mt_LowMask(PC),D0
st.B mt_LowMask
ADD.W D0,n_period(A6)
MOVE.W n_period(A6),D0
AND.W #$0FFF,D0
CMP.W #856,D0
BMI.S mt_PortaDskip
AND.W #$F000,n_period(A6)
OR.W #856,n_period(A6)
mt_PortaDskip:
MOVE.W n_period(A6),D0
AND.W #$0FFF,D0
MOVE.W D0,6(A5)
RTS
mt_SetTonePorta:
MOVE.L A0,-(SP)
MOVE.W (A6),D2
AND.W #$0FFF,D2
MOVEQ #0,D0
MOVE.B n_finetune(A6),D0
MULU.w #37*2,D0
LEA mt_PeriodTable(PC),A0
ADD.L D0,A0
MOVEQ #0,D0
mt_StpLoop:
CMP.W (A0,D0.W),D2
BHS.S mt_StpFound
ADDQ.W #2,D0
CMP.W #37*2,D0
BLO.S mt_StpLoop
MOVEQ #35*2,D0
mt_StpFound:
MOVE.B n_finetune(A6),D2
AND.B #8,D2
BEQ.S mt_StpGoss
TST.W D0
BEQ.S mt_StpGoss
SUBQ.W #2,D0
mt_StpGoss:
MOVE.W (A0,D0.W),D2
MOVE.L (SP)+,A0
MOVE.W D2,n_wantedperiod(A6)
MOVE.W n_period(A6),D0
CLR.B n_toneportdirec(A6)
CMP.W D0,D2
BEQ.S mt_ClearTonePorta
BGE.w mt_Return2
MOVE.B #1,n_toneportdirec(A6)
RTS
mt_ClearTonePorta:
CLR.W n_wantedperiod(A6)
RTS
mt_TonePortamento:
MOVE.B n_cmdlo(A6),D0
BEQ.S mt_TonePortNoChange
MOVE.B D0,n_toneportspeed(A6)
CLR.B n_cmdlo(A6)
mt_TonePortNoChange:
TST.W n_wantedperiod(A6)
BEQ.w mt_Return2
MOVEQ #0,D0
MOVE.B n_toneportspeed(A6),D0
TST.B n_toneportdirec(A6)
BNE.S mt_TonePortaUp
mt_TonePortaDown:
ADD.W D0,n_period(A6)
MOVE.W n_wantedperiod(A6),D0
CMP.W n_period(A6),D0
BGT.S mt_TonePortaSetPer
MOVE.W n_wantedperiod(A6),n_period(A6)
CLR.W n_wantedperiod(A6)
BRA.S mt_TonePortaSetPer
mt_TonePortaUp:
SUB.W D0,n_period(A6)
MOVE.W n_wantedperiod(A6),D0
CMP.W n_period(A6),D0
BLT.S mt_TonePortaSetPer
MOVE.W n_wantedperiod(A6),n_period(A6)
CLR.W n_wantedperiod(A6)
mt_TonePortaSetPer:
MOVE.W n_period(A6),D2
MOVE.B n_glissfunk(A6),D0
AND.B #$0F,D0
BEQ.S mt_GlissSkip
MOVEQ #0,D0
MOVE.B n_finetune(A6),D0
MULU.w #36*2,D0
LEA mt_PeriodTable(PC),A0
ADD.L D0,A0
MOVEQ #0,D0
mt_GlissLoop:
CMP.W (A0,D0.W),D2
BHS.S mt_GlissFound
ADDQ.W #2,D0
CMP.W #36*2,D0
BLO.S mt_GlissLoop
MOVEQ #35*2,D0
mt_GlissFound:
MOVE.W (A0,D0.W),D2
mt_GlissSkip:
MOVE.W D2,6(A5) ; Set period
RTS
mt_Vibrato:
MOVE.B n_cmdlo(A6),D0
BEQ.S mt_Vibrato2
MOVE.B n_vibratocmd(A6),D2
AND.B #$0F,D0
BEQ.S mt_vibskip
AND.B #$F0,D2
OR.B D0,D2
mt_vibskip:
MOVE.B n_cmdlo(A6),D0
AND.B #$F0,D0
BEQ.S mt_vibskip2
AND.B #$0F,D2
OR.B D0,D2
mt_vibskip2:
MOVE.B D2,n_vibratocmd(A6)
mt_Vibrato2:
MOVE.B n_vibratopos(A6),D0
LEA mt_VibratoTable(PC),A4
LSR.W #2,D0
AND.W #$001F,D0
MOVEQ #0,D2
MOVE.B n_wavecontrol(A6),D2
AND.B #$03,D2
BEQ.S mt_vib_sine
LSL.B #3,D0
CMP.B #1,D2
BEQ.S mt_vib_rampdown
MOVE.B #255,D2
BRA.S mt_vib_set
mt_vib_rampdown:
TST.B n_vibratopos(A6)
BPL.S mt_vib_rampdown2
MOVE.B #255,D2
SUB.B D0,D2
BRA.S mt_vib_set
mt_vib_rampdown2:
MOVE.B D0,D2
BRA.S mt_vib_set
mt_vib_sine:
MOVE.B 0(A4,D0.W),D2
mt_vib_set:
MOVE.B n_vibratocmd(A6),D0
AND.W #15,D0
MULU.w D0,D2
LSR.W #7,D2
MOVE.W n_period(A6),D0
TST.B n_vibratopos(A6)
BMI.S mt_VibratoNeg
ADD.W D2,D0
BRA.S mt_Vibrato3
mt_VibratoNeg:
SUB.W D2,D0
mt_Vibrato3:
MOVE.W D0,6(A5)
MOVE.B n_vibratocmd(A6),D0
LSR.W #2,D0
AND.W #$003C,D0
ADD.B D0,n_vibratopos(A6)
RTS
mt_TonePlusVolSlide:
BSR.w mt_TonePortNoChange
BRA.w mt_VolumeSlide
mt_VibratoPlusVolSlide:
BSR.S mt_Vibrato2
BRA.w mt_VolumeSlide
mt_Tremolo:
MOVE.B n_cmdlo(A6),D0
BEQ.S mt_Tremolo2
MOVE.B n_tremolocmd(A6),D2
AND.B #$0F,D0
BEQ.S mt_treskip
AND.B #$F0,D2
OR.B D0,D2
mt_treskip:
MOVE.B n_cmdlo(A6),D0
AND.B #$F0,D0
BEQ.S mt_treskip2
AND.B #$0F,D2
OR.B D0,D2
mt_treskip2:
MOVE.B D2,n_tremolocmd(A6)
mt_Tremolo2:
MOVE.B n_tremolopos(A6),D0
LEA mt_VibratoTable(PC),A4
LSR.W #2,D0
AND.W #$001F,D0
MOVEQ #0,D2
MOVE.B n_wavecontrol(A6),D2
LSR.B #4,D2
AND.B #$03,D2
BEQ.S mt_tre_sine
LSL.B #3,D0
CMP.B #1,D2
BEQ.S mt_tre_rampdown
MOVE.B #255,D2
BRA.S mt_tre_set
mt_tre_rampdown:
TST.B n_vibratopos(A6)
BPL.S mt_tre_rampdown2
MOVE.B #255,D2
SUB.B D0,D2
BRA.S mt_tre_set
mt_tre_rampdown2:
MOVE.B D0,D2
BRA.S mt_tre_set
mt_tre_sine:
MOVE.B 0(A4,D0.W),D2
mt_tre_set:
MOVE.B n_tremolocmd(A6),D0
AND.W #15,D0
MULU.w D0,D2
LSR.W #6,D2
MOVEQ #0,D0
MOVE.B n_volume(A6),D0
TST.B n_tremolopos(A6)
BMI.S mt_TremoloNeg
ADD.W D2,D0
BRA.S mt_Tremolo3
mt_TremoloNeg:
SUB.W D2,D0
mt_Tremolo3:
BPL.S mt_TremoloSkip
CLR.W D0
mt_TremoloSkip:
CMP.W #$40,D0
BLS.S mt_TremoloOk
MOVE.W #$40,D0
mt_TremoloOk:
MOVE.W D0,8(A5)
MOVE.B n_tremolocmd(A6),D0
LSR.W #2,D0
AND.W #$003C,D0
ADD.B D0,n_tremolopos(A6)
RTS
mt_SampleOffset:
MOVEQ #0,D0
MOVE.B n_cmdlo(A6),D0
BEQ.S mt_sononew
MOVE.B D0,n_sampleoffset(A6)
mt_sononew:
MOVE.B n_sampleoffset(A6),D0
LSL.W #7,D0
CMP.W n_length(A6),D0
BGE.S mt_sofskip
SUB.W D0,n_length(A6)
LSL.W #1,D0
ADD.L D0,n_start(A6)
RTS
mt_sofskip:
MOVE.W #$0001,n_length(A6)
RTS
mt_VolumeSlide:
MOVEQ #0,D0
MOVE.B n_cmdlo(A6),D0
LSR.B #4,D0
TST.B D0
BEQ.S mt_VolSlideDown
mt_VolSlideUp:
ADD.B D0,n_volume(A6)
CMP.B #$40,n_volume(A6)
BMI.S mt_vsuskip
MOVE.B #$40,n_volume(A6)
mt_vsuskip:
MOVE.B n_volume(A6),D0
MOVE.W D0,8(A5)
RTS
mt_VolSlideDown:
MOVEQ #0,D0
MOVE.B n_cmdlo(A6),D0
AND.B #$0F,D0
mt_VolSlideDown2:
SUB.B D0,n_volume(A6)
BPL.S mt_vsdskip
CLR.B n_volume(A6)
mt_vsdskip:
MOVE.B n_volume(A6),D0
MOVE.W D0,8(A5)
RTS
mt_PositionJump:
MOVE.B n_cmdlo(A6),D0
SUBQ.B #1,D0
MOVE.B D0,mt_SongPos
mt_pj2:
CLR.B mt_PBreakPos
ST mt_PosJumpFlag
RTS
mt_VolumeChange:
MOVEQ #0,D0
MOVE.B n_cmdlo(A6),D0
CMP.B #$40,D0
BLS.S mt_VolumeOk
MOVEQ #$40,D0
mt_VolumeOk:
MOVE.B D0,n_volume(A6)
MOVE.W D0,8(A5)
RTS
mt_PatternBreak:
MOVEQ #0,D0
MOVE.B n_cmdlo(A6),D0
MOVE.L D0,D2
LSR.B #4,D0
MULU.w #10,D0
AND.B #$0F,D2
ADD.B D2,D0
CMP.B #63,D0
BHI.S mt_pj2
MOVE.B D0,mt_PBreakPos
ST mt_PosJumpFlag
RTS
mt_SetSpeed:
MOVE.B 3(A6),D0
BEQ.w mt_Return2
CLR.B mt_counter
MOVE.B D0,mt_speed
RTS
mt_CheckMoreEfx:
BSR.w mt_UpdateFunk
MOVE.B 2(A6),D0
AND.B #$0F,D0
CMP.B #$9,D0
BEQ.w mt_SampleOffset
CMP.B #$B,D0
BEQ.w mt_PositionJump
CMP.B #$D,D0
BEQ.S mt_PatternBreak
CMP.B #$E,D0
BEQ.S mt_E_Commands
CMP.B #$F,D0
BEQ.S mt_SetSpeed
CMP.B #$C,D0
BEQ.w mt_VolumeChange
BRA.w mt_PerNop
mt_E_Commands:
MOVE.B n_cmdlo(A6),D0
AND.B #$F0,D0
LSR.B #4,D0
BEQ.S mt_FilterOnOff
CMP.B #1,D0
BEQ.w mt_FinePortaUp
CMP.B #2,D0
BEQ.w mt_FinePortaDown
CMP.B #3,D0
BEQ.S mt_SetGlissControl
CMP.B #4,D0
BEQ.w mt_SetVibratoControl
CMP.B #5,D0
BEQ.w mt_SetFineTune
CMP.B #6,D0
BEQ.w mt_JumpLoop
CMP.B #7,D0
BEQ.w mt_SetTremoloControl
CMP.B #9,D0
BEQ.w mt_RetrigNote
CMP.B #$A,D0
BEQ.w mt_VolumeFineUp
CMP.B #$B,D0
BEQ.w mt_VolumeFineDown
CMP.B #$C,D0
BEQ.w mt_NoteCut
CMP.B #$D,D0
BEQ.w mt_NoteDelay
CMP.B #$E,D0
BEQ.w mt_PatternDelay
CMP.B #$F,D0
BEQ.w mt_FunkIt
RTS
mt_FilterOnOff:
MOVE.B n_cmdlo(A6),D0
AND.B #1,D0
add.b d0,d0
AND.B #$FD,$BFE001
OR.B D0,$BFE001
RTS
mt_SetGlissControl:
MOVE.B n_cmdlo(A6),D0
AND.B #$0F,D0
AND.B #$F0,n_glissfunk(A6)
OR.B D0,n_glissfunk(A6)
RTS
mt_SetVibratoControl:
MOVE.B n_cmdlo(A6),D0
AND.B #$0F,D0
AND.B #$F0,n_wavecontrol(A6)
OR.B D0,n_wavecontrol(A6)
RTS
mt_SetFineTune:
MOVE.B n_cmdlo(A6),D0
AND.B #$0F,D0
MOVE.B D0,n_finetune(A6)
RTS
mt_JumpLoop:
TST.B mt_counter
BNE.w mt_Return2
MOVE.B n_cmdlo(A6),D0
AND.B #$0F,D0
BEQ.S mt_SetLoop
TST.B n_loopcount(A6)
BEQ.S mt_jumpcnt
SUBQ.B #1,n_loopcount(A6)
BEQ.w mt_Return2
mt_jmploop:
MOVE.B n_pattpos(A6),mt_PBreakPos
ST mt_PBreakFlag
RTS
mt_jumpcnt:
MOVE.B D0,n_loopcount(A6)
BRA.S mt_jmploop
mt_SetLoop:
MOVE.W mt_PatternPos(PC),D0
LSR.W #4,D0
MOVE.B D0,n_pattpos(A6)
RTS
mt_SetTremoloControl:
MOVE.B n_cmdlo(A6),D0
AND.B #$0F,D0
LSL.B #4,D0
AND.B #$0F,n_wavecontrol(A6)
OR.B D0,n_wavecontrol(A6)
RTS
mt_RetrigNote:
MOVE.L D1,-(SP)
MOVEQ #0,D0
MOVE.B n_cmdlo(A6),D0
AND.B #$0F,D0
BEQ.S mt_rtnend
MOVEQ #0,D1
MOVE.B mt_counter(PC),D1
BNE.S mt_rtnskp
MOVE.W (A6),D1
AND.W #$0FFF,D1
BNE.S mt_rtnend
MOVEQ #0,D1
MOVE.B mt_counter(PC),D1
mt_rtnskp:
DIVU.w D0,D1
SWAP D1
TST.W D1
BNE.S mt_rtnend
mt_DoRetrig:
MOVE.W n_dmabit(A6),$DFF096 ; Channel DMA off
MOVE.L n_start(A6),(A5) ; Set sampledata pointer
MOVE.W n_length(A6),4(A5) ; Set length
bsr.w WaitaDMA
MOVE.W n_dmabit(A6),D0
ori.w #$8000,d0
MOVE.W D0,$DFF096
bsr.w WaitaDMA
MOVE.L n_loopstart(A6),(A5)
MOVE.L n_replen(A6),4(A5)
mt_rtnend:
MOVE.L (SP)+,D1
RTS
mt_VolumeFineUp:
TST.B mt_counter
BNE.w mt_Return2
MOVEQ #0,D0
MOVE.B n_cmdlo(A6),D0
AND.B #$F,D0
BRA.w mt_VolSlideUp
mt_VolumeFineDown:
TST.B mt_counter
BNE.w mt_Return2
MOVEQ #0,D0
MOVE.B n_cmdlo(A6),D0
AND.B #$0F,D0
BRA.w mt_VolSlideDown2
mt_NoteCut:
MOVEQ #0,D0
MOVE.B n_cmdlo(A6),D0
AND.B #$0F,D0
CMP.B mt_counter(PC),D0
BNE.w mt_Return2
CLR.B n_volume(A6)
CLR.W 8(A5)
RTS
mt_NoteDelay:
MOVEQ #0,D0
MOVE.B n_cmdlo(A6),D0
AND.B #$0F,D0
CMP.B mt_Counter(PC),D0
BNE.w mt_Return2
MOVE.W (A6),D0
BEQ.w mt_Return2
MOVE.L D1,-(SP)
BRA.w mt_DoRetrig
mt_PatternDelay:
TST.B mt_counter
BNE.w mt_Return2
MOVEQ #0,D0
MOVE.B n_cmdlo(A6),D0
AND.B #$0F,D0
TST.B mt_PattDelTime2
BNE.w mt_Return2
ADDQ.B #1,D0
MOVE.B D0,mt_PattDelTime
RTS
mt_FunkIt:
TST.B mt_counter
BNE.w mt_Return2
MOVE.B n_cmdlo(A6),D0
AND.B #$0F,D0
LSL.B #4,D0
AND.B #$0F,n_glissfunk(A6)
OR.B D0,n_glissfunk(A6)
TST.B D0
BEQ.w mt_Return2
mt_UpdateFunk:
MOVEM.L A0/D1,-(SP)
MOVEQ #0,D0
MOVE.B n_glissfunk(A6),D0
LSR.B #4,D0
BEQ.S mt_funkend
LEA mt_FunkTable(PC),A0
MOVE.B (A0,D0.W),D0
ADD.B D0,n_funkoffset(A6)
BTST #7,n_funkoffset(A6)
BEQ.S mt_funkend
CLR.B n_funkoffset(A6)
MOVE.L n_loopstart(A6),D0
MOVEQ #0,D1
MOVE.W n_replen(A6),D1
ADD.L D1,D0
ADD.L D1,D0
MOVE.L n_wavestart(A6),A0
ADDQ.w #1,A0
CMP.L D0,A0
BLO.S mt_funkok
MOVE.L n_loopstart(A6),A0
mt_funkok:
MOVE.L A0,n_wavestart(A6)
MOVEQ #-1,D0
SUB.B (A0),D0
MOVE.B D0,(A0)
mt_funkend:
MOVEM.L (SP)+,A0/D1
RTS
cnop 0,4
mt_FunkTable:
dc.b 0,5,6,7,8,10,11,13,16,19,22,26,32,43,64,128
cnop 0,4
mt_VibratoTable:
dc.b 0,24,49,74,97,120,141,161
dc.b 180,197,212,224,235,244,250,253
dc.b 255,253,250,244,235,224,212,197
dc.b 180,161,141,120,97,74,49,24
cnop 0,4
mt_PeriodTable:
; Tuning 0, Normal
dc.w 856,808,762,720,678,640,604,570,538,508,480,453
dc.w 428,404,381,360,339,320,302,285,269,254,240,226
dc.w 214,202,190,180,170,160,151,143,135,127,120,113
; Tuning 1
dc.w 850,802,757,715,674,637,601,567,535,505,477,450
dc.w 425,401,379,357,337,318,300,284,268,253,239,225
dc.w 213,201,189,179,169,159,150,142,134,126,119,113
; Tuning 2
dc.w 844,796,752,709,670,632,597,563,532,502,474,447
dc.w 422,398,376,355,335,316,298,282,266,251,237,224
dc.w 211,199,188,177,167,158,149,141,133,125,118,112
; Tuning 3
dc.w 838,791,746,704,665,628,592,559,528,498,470,444
dc.w 419,395,373,352,332,314,296,280,264,249,235,222
dc.w 209,198,187,176,166,157,148,140,132,125,118,111
; Tuning 4
dc.w 832,785,741,699,660,623,588,555,524,495,467,441
dc.w 416,392,370,350,330,312,294,278,262,247,233,220
dc.w 208,196,185,175,165,156,147,139,131,124,117,110
; Tuning 5
dc.w 826,779,736,694,655,619,584,551,520,491,463,437
dc.w 413,390,368,347,328,309,292,276,260,245,232,219
dc.w 206,195,184,174,164,155,146,138,130,123,116,109
; Tuning 6
dc.w 820,774,730,689,651,614,580,547,516,487,460,434
dc.w 410,387,365,345,325,307,290,274,258,244,230,217
dc.w 205,193,183,172,163,154,145,137,129,122,115,109
; Tuning 7
dc.w 814,768,725,684,646,610,575,543,513,484,457,431
dc.w 407,384,363,342,323,305,288,272,256,242,228,216
dc.w 204,192,181,171,161,152,144,136,128,121,114,108
; Tuning -8
dc.w 907,856,808,762,720,678,640,604,570,538,508,480
dc.w 453,428,404,381,360,339,320,302,285,269,254,240
dc.w 226,214,202,190,180,170,160,151,143,135,127,120
; Tuning -7
dc.w 900,850,802,757,715,675,636,601,567,535,505,477
dc.w 450,425,401,379,357,337,318,300,284,268,253,238
dc.w 225,212,200,189,179,169,159,150,142,134,126,119
; Tuning -6
dc.w 894,844,796,752,709,670,632,597,563,532,502,474
dc.w 447,422,398,376,355,335,316,298,282,266,251,237
dc.w 223,211,199,188,177,167,158,149,141,133,125,118
; Tuning -5
dc.w 887,838,791,746,704,665,628,592,559,528,498,470
dc.w 444,419,395,373,352,332,314,296,280,264,249,235
dc.w 222,209,198,187,176,166,157,148,140,132,125,118
; Tuning -4
dc.w 881,832,785,741,699,660,623,588,555,524,494,467
dc.w 441,416,392,370,350,330,312,294,278,262,247,233
dc.w 220,208,196,185,175,165,156,147,139,131,123,117
; Tuning -3
dc.w 875,826,779,736,694,655,619,584,551,520,491,463
dc.w 437,413,390,368,347,328,309,292,276,260,245,232
dc.w 219,206,195,184,174,164,155,146,138,130,123,116
; Tuning -2
dc.w 868,820,774,730,689,651,614,580,547,516,487,460
dc.w 434,410,387,365,345,325,307,290,274,258,244,230
dc.w 217,205,193,183,172,163,154,145,137,129,122,115
; Tuning -1
dc.w 862,814,768,725,684,646,610,575,543,513,484,457
dc.w 431,407,384,363,342,323,305,288,272,256,242,228
dc.w 216,203,192,181,171,161,152,144,136,128,121,114
cnop 0,4
mt_chan1temp: dc.l 0,0,0,0,0,$10000,0,0,0,0,0
cnop 0,4
mt_chan2temp: dc.l 0,0,0,0,0,$20000,0,0,0,0,0
cnop 0,4
mt_chan3temp: dc.l 0,0,0,0,0,$40000,0,0,0,0,0
cnop 0,4
mt_chan4temp: dc.l 0,0,0,0,0,$80000,0,0,0,0,0
cnop 0,4
mt_SampleStarts:
dc.l 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
dc.l 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
cnop 0,4
mt_SongDataPtr: dc.l 0
cnop 0,4
mt_speed: dc.b 6
cnop 0,4
mt_counter: dc.b 0
cnop 0,4
mt_SongPos: dc.b 0
cnop 0,4
mt_PBreakPos: dc.b 0
cnop 0,4
mt_PosJumpFlag: dc.b 0
cnop 0,4
mt_PBreakFlag: dc.b 0
cnop 0,4
mt_LowMask: dc.b 0
cnop 0,4
mt_PattDelTime: dc.b 0
cnop 0,4
mt_PattDelTime2:
dc.b 0,0
cnop 0,4
mt_PatternPos: dc.w 0
cnop 0,4
mt_DMACONtemp: dc.w 0