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pro_tracker21a.dms
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PT-CIAPlay.s
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1992-04-13
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25KB
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1,306 lines
;**************************************************
;* ----- Protracker V2.1A Playroutine ----- *
;* Peter "CRAYON" Hanning / Mushroom Studios 1992 *
;* Vinterstigen 12, 14440 Ronninge, Sweden *
;**************************************************
DMAWait = 300 ; Set this as low as possible without losing low notes.
; CIA Version 1:
; Call SetCIAInt to install the interrupt server. Then call mt_init
; to initialize the song. Playback starts when the mt_enable flag
; is set to a nonzero value. To end the song and turn off all voices,
; call mt_end. At last, call ResetCIAInt to remove the interrupt.
; This playroutine is not very fast, optimized or well commented,
; but all the new commands in PT2.1 should work.
; If it's not good enough, you'll have to change it yourself.
; We'll try to write a faster routine soon...
; Changes from V1.0C playroutine:
; - Vibrato depth changed to be compatible with Noisetracker 2.0.
; You'll have to double all vib. depths on old PT modules.
; - Funk Repeat changed to Invert Loop.
; - Period set back earlier when stopping an effect.
; You can use this routine to play a module. Just remove the semicolons.
; Exit by pressing both mousebuttons.
;
;main BSR.S SetCIAInt
; BSR mt_init
; ST mt_Enable
; MOVE.L 4.W,A6
; LEA DOSname(PC),A1
; MOVEQ #0,D0
; JSR LVOOpenLibrary(A6)
; TST.L D0
; BEQ.S theend
; MOVE.L D0,A6
;wloop MOVEQ #10,D1
; JSR LVODelay(A6)
; BTST #6,$BFE001
; BNE.S wloop
; BTST #2,$DFF016
; BNE.S wloop
; MOVE.L A6,A1
; MOVE.L 4.W,A6
; JSR LVOCloseLibrary(A6)
;theend BSR mt_end
; BSR ResetCIAInt
; RTS
;
;DOSname dc.b "dos.library",0
;---- CIA Interrupt ----
AddICRVector = -6
RemICRVector = -12
LVOOpenResource = -498
LVOOpenLibrary = -552
LVOCloseLibrary = -414
LVODelay = -198
ciatalo = $400
ciatahi = $500
ciatblo = $600
ciatbhi = $700
ciacra = $E00
ciacrb = $F00
SetCIAInt
MOVEQ #2,D6
LEA $BFD000,A5
MOVE.B #'b',CIAAname+3
SetCIALoop
MOVEQ #0,D0
LEA CIAAname(PC),A1
MOVE.L 4.W,A6
JSR LVOOpenResource(A6)
MOVE.L D0,CIAAbase
BEQ mt_Return
LEA GfxName(PC),A1
MOVEQ #0,D0
JSR LVOOpenLibrary(A6)
TST.L D0
BEQ ResetCIAInt
MOVE.L D0,A1
MOVE.W 206(A1),D0 ; DisplayFlags
BTST #2,D0 ; PAL?
BEQ.S WasNTSC
MOVE.L #1773447,D7 ; PAL
BRA.S sciask
WasNTSC MOVE.L #1789773,D7 ; NTSC
sciask MOVE.L D7,TimerValue
DIVU #125,D7 ; Default to normal 50 Hz timer
JSR CloseLibrary(A6)
MOVE.L CIAAbase(PC),A6
CMP.W #2,D6
BEQ.S TryTimerA
TryTimerB
LEA MusicIntServer(PC),A1
MOVEQ #1,D0 ; Bit 1: Timer B
JSR AddICRVector(A6)
MOVE.L #1,TimerFlag
TST.L D0
BNE.S CIAError
MOVE.L A5,CIAAaddr
MOVE.B D7,ciatblo(A5)
LSR.W #8,D7
MOVE.B D7,ciatbhi(A5)
BSET #0,ciacrb(A5)
RTS
TryTimerA
LEA MusicIntServer(PC),A1
MOVEQ #0,D0 ; Bit 0: Timer A
JSR AddICRVector(A6)
CLR.L TimerFlag
TST.L D0
BNE.S CIAError
MOVE.L A5,CIAAaddr
MOVE.B D7,ciatalo(A5)
LSR.W #8,D7
MOVE.B D7,ciatahi(A5)
BSET #0,ciacra(A5)
RTS
CIAError
MOVE.B #'a',CIAAname+3
LEA $BFE001,A5
SUBQ.W #1,D6
BNE SetCIALoop
CLR.L CIAAbase
RTS
ResetCIAInt
MOVE.L CIAAbase(PC),D0
BEQ mt_Return
CLR.L CIAAbase
MOVE.L D0,A6
MOVE.L CIAAaddr(PC),A5
TST.L TimerFlag
BEQ.S ResTimerA
BCLR #0,ciacrb(A5)
MOVEQ #1,D0
BRA.S RemInt
ResTimerA
BCLR #0,ciacra(A5)
MOVEQ #0,D0
RemInt LEA MusicIntServer(PC),A1
MOVEQ #0,d0
JSR RemICRVector(A6)
RTS
;---- Tempo ----
SetTempo
MOVE.L CIAAbase(PC),D2
BEQ mt_Return
CMP.W #32,D0
BHS.S setemsk
MOVEQ #32,D0
setemsk MOVE.W D0,RealTempo
MOVE.L TimerValue(PC),D2
DIVU D0,D2
MOVE.L CIAAaddr(PC),A4
MOVE.L TimerFlag(PC),D0
BEQ.S SetTemA
MOVE.B D2,ciatblo(A4)
LSR.W #8,D2
MOVE.B D2,ciatbhi(A4)
RTS
SetTemA MOVE.B D2,ciatalo(A4)
LSR.W #8,D2
MOVE.B D2,ciatahi(A4)
RTS
RealTempo dc.w 125
CIAAaddr dc.l 0
CIAAname dc.b "ciaa.resource",0
CIAAbase dc.l 0
TimerFlag dc.l 0
TimerValue dc.l 0
GfxName dc.b "graphics.library",0,0
MusicIntServer
dc.l 0,0
dc.b 2,5 ; type, priority
dc.l musintname
dc.l 0,mt_music
musintname dc.b "Protracker MusicInt",0
;---- Playroutine ----
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 LEA 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)
MOVE.L A2,(A1)+
MOVEQ #0,D1
MOVE.W 42(A0),D1
ASL.L #1,D1
ADD.L D1,A2
ADD.L #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 SF mt_Enable
LEA $DFF000,A0
CLR.W $A8(A0)
CLR.W $B8(A0)
CLR.W $C8(A0)
CLR.W $D8(A0)
MOVE.W #$F,$DFF096
RTS
mt_music
MOVEM.L D0-D4/A0-A6,-(SP)
TST.B mt_Enable
BEQ mt_exit
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 mt_dskip
mt_NoNewNote
BSR.S mt_NoNewAllChannels
BRA mt_NoNewPosYet
mt_NoNewAllChannels
LEA $DFF0A0,A5
LEA mt_chan1temp(PC),A6
BSR mt_CheckEfx
LEA $DFF0B0,A5
LEA mt_chan2temp(PC),A6
BSR mt_CheckEfx
LEA $DFF0C0,A5
LEA mt_chan3temp(PC),A6
BSR mt_CheckEfx
LEA $DFF0D0,A5
LEA mt_chan4temp(PC),A6
BRA 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 $DFF0D0,A5
LEA mt_chan4temp(PC),A6
BSR.S mt_PlayVoice
BRA mt_SetDMA
mt_PlayVoice
TST.L (A6)
BNE.S mt_plvskip
BSR mt_PerNop
mt_plvskip
MOVE.L (A0,D1.L),(A6)
ADDQ.L #4,D1
MOVEQ #0,D2
MOVE.B n_cmd(A6),D2
AND.B #$F0,D2
LSR.B #4,D2
MOVE.B (A6),D0
AND.B #$F0,D0
OR.B D0,D2
TST.B D2
BEQ mt_SetRegs
MOVEQ #0,D3
LEA mt_SampleStarts(PC),A1
MOVE D2,D4
SUBQ.L #1,D2
ASL.L #2,D2
MULU #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
ASL.W #1,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 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 mt_CheckMoreEfx
BRA.S mt_SetPeriod
mt_DoSetFineTune
BSR mt_SetFineTune
BRA.S mt_SetPeriod
mt_ChkTonePorta
BSR mt_SetTonePorta
BRA 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,D2
mt_ftuloop
CMP.W (A1,D0.W),D1
BHS.S mt_ftufound
ADDQ.L #2,D0
DBRA D2,mt_ftuloop
mt_ftufound
MOVEQ #0,D1
MOVE.B n_finetune(A6),D1
MULU #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 #$0ED0,D0 ; Notedelay
BEQ mt_CheckMoreEfx
MOVE.W n_dmabit(A6),$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 mt_CheckMoreEfx
mt_SetDMA
MOVE.W #300,D0
mt_WaitDMA
DBRA D0,mt_WaitDMA
MOVE.W mt_DMACONtemp(PC),D0
OR.W #$8000,D0
MOVE.W D0,$DFF096
MOVE.W #300,D0
mt_WaitDMA2
DBRA D0,mt_WaitDMA2
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,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
mt_exit MOVEM.L (SP)+,D0-D4/A0-A6
RTS
mt_CheckEfx
BSR mt_UpdateFunk
MOVE.W n_cmd(A6),D0
AND.W #$0FFF,D0
BEQ.S mt_PerNop
MOVE.B n_cmd(A6),D0
AND.B #$0F,D0
BEQ.S mt_Arpeggio
CMP.B #1,D0
BEQ mt_PortaUp
CMP.B #2,D0
BEQ mt_PortaDown
CMP.B #3,D0
BEQ mt_TonePortamento
CMP.B #4,D0
BEQ mt_Vibrato
CMP.B #5,D0
BEQ mt_TonePlusVolSlide
CMP.B #6,D0
BEQ mt_VibratoPlusVolSlide
CMP.B #$E,D0
BEQ mt_E_Commands
SetBack MOVE.W n_period(A6),6(A5)
CMP.B #7,D0
BEQ mt_Tremolo
CMP.B #$A,D0
BEQ mt_VolumeSlide
mt_Return
RTS
mt_PerNop
MOVE.W n_period(A6),6(A5)
RTS
mt_Arpeggio
MOVEQ #0,D0
MOVE.B mt_counter(PC),D0
DIVS #3,D0
SWAP D0
CMP.W #0,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
ASL.W #1,D0
MOVEQ #0,D1
MOVE.B n_finetune(A6),D1
MULU #36*2,D1
LEA mt_PeriodTable(PC),A0
ADD.L D1,A0
MOVEQ #0,D1
MOVE.W n_period(A6),D1
MOVEQ #36,D3
mt_arploop
MOVE.W (A0,D0.W),D2
CMP.W (A0),D1
BHS.S mt_Arpeggio4
ADDQ.L #2,A0
DBRA D3,mt_arploop
RTS
mt_Arpeggio4
MOVE.W D2,6(A5)
RTS
mt_FinePortaUp
TST.B mt_counter
BNE.S mt_Return
MOVE.B #$0F,mt_LowMask
mt_PortaUp
MOVEQ #0,D0
MOVE.B n_cmdlo(A6),D0
AND.B mt_LowMask(PC),D0
MOVE.B #$FF,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 mt_Return
MOVE.B #$0F,mt_LowMask
mt_PortaDown
CLR.W D0
MOVE.B n_cmdlo(A6),D0
AND.B mt_LowMask(PC),D0
MOVE.B #$FF,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 #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 mt_Return
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 mt_Return
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 #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 (A4,D0.W),D2
mt_vib_set
MOVE.B n_vibratocmd(A6),D0
AND.W #15,D0
MULU 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 mt_TonePortNoChange
BRA mt_VolumeSlide
mt_VibratoPlusVolSlide
BSR.S mt_Vibrato2
BRA 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 (A4,D0.W),D2
mt_tre_set
MOVE.B n_tremolocmd(A6),D0
AND.W #15,D0
MULU 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 #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
MOVEQ #0,D0
MOVE.B 3(A6),D0
BEQ mt_end
CMP.B #32,D0
BHS SetTempo
CLR.B mt_counter
MOVE.B D0,mt_speed
RTS
mt_CheckMoreEfx
BSR mt_UpdateFunk
MOVE.B 2(A6),D0
AND.B #$0F,D0
CMP.B #$9,D0
BEQ mt_SampleOffset
CMP.B #$B,D0
BEQ 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 mt_VolumeChange
BRA mt_PerNop
mt_E_Commands
MOVE.B n_cmdlo(A6),D0
AND.B #$F0,D0
LSR.B #4,D0
BEQ.S mt_FilterOnOff
CMP.B #1,D0
BEQ mt_FinePortaUp
CMP.B #2,D0
BEQ mt_FinePortaDown
CMP.B #3,D0
BEQ.S mt_SetGlissControl
CMP.B #4,D0
BEQ mt_SetVibratoControl
CMP.B #5,D0
BEQ mt_SetFineTune
CMP.B #6,D0
BEQ mt_JumpLoop
CMP.B #7,D0
BEQ mt_SetTremoloControl
CMP.B #9,D0
BEQ mt_RetrigNote
CMP.B #$A,D0
BEQ mt_VolumeFineUp
CMP.B #$B,D0
BEQ mt_VolumeFineDown
CMP.B #$C,D0
BEQ mt_NoteCut
CMP.B #$D,D0
BEQ mt_NoteDelay
CMP.B #$E,D0
BEQ mt_PatternDelay
CMP.B #$F,D0
BEQ mt_FunkIt
RTS
mt_FilterOnOff
MOVE.B n_cmdlo(A6),D0
AND.B #1,D0
ASL.B #1,D0
AND.B #$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 mt_Return
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 mt_Return
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 #$0FFF,D1
BNE.S mt_rtnend
MOVEQ #0,D1
MOVE.B mt_counter(PC),D1
mt_rtnskp
DIVU D0,D1
SWAP D1
TST.W D1
BNE.S mt_rtnend
mt_DoRetrig
MOVE.W n_dmabit(A6),$DFF096 ; Channel DMA off
MOVE.L n_start(A6),(A5) ; Set sampledata pointer
MOVE.W n_length(A6),4(A5) ; Set length
MOVE.W #300,D0
mt_rtnloop1
DBRA D0,mt_rtnloop1
MOVE.W n_dmabit(A6),D0
BSET #15,D0
MOVE.W D0,$DFF096
MOVE.W #300,D0
mt_rtnloop2
DBRA D0,mt_rtnloop2
MOVE.L n_loopstart(A6),(A5)
MOVE.L n_replen(A6),4(A5)
mt_rtnend
MOVE.L (SP)+,D1
RTS
mt_VolumeFineUp
TST.B mt_counter
BNE mt_Return
MOVEQ #0,D0
MOVE.B n_cmdlo(A6),D0
AND.B #$F,D0
BRA mt_VolSlideUp
mt_VolumeFineDown
TST.B mt_counter
BNE mt_Return
MOVEQ #0,D0
MOVE.B n_cmdlo(A6),D0
AND.B #$0F,D0
BRA mt_VolSlideDown2
mt_NoteCut
MOVEQ #0,D0
MOVE.B n_cmdlo(A6),D0
AND.B #$0F,D0
CMP.B mt_counter(PC),D0
BNE mt_Return
CLR.B n_volume(A6)
MOVE.W #0,8(A5)
RTS
mt_NoteDelay
MOVEQ #0,D0
MOVE.B n_cmdlo(A6),D0
AND.B #$0F,D0
CMP.B mt_Counter,D0
BNE mt_Return
MOVE.W (A6),D0
BEQ mt_Return
MOVE.L D1,-(SP)
BRA mt_DoRetrig
mt_PatternDelay
TST.B mt_counter
BNE mt_Return
MOVEQ #0,D0
MOVE.B n_cmdlo(A6),D0
AND.B #$0F,D0
TST.B mt_PattDelTime2
BNE mt_Return
ADDQ.B #1,D0
MOVE.B D0,mt_PattDelTime
RTS
mt_FunkIt
TST.B mt_counter
BNE mt_Return
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 mt_Return
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.L #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
mt_FunkTable dc.b 0,5,6,7,8,10,11,13,16,19,22,26,32,43,64,128
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
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
mt_chan1temp dc.l 0,0,0,0,0,$00010000,0, 0,0,0,0
mt_chan2temp dc.l 0,0,0,0,0,$00020000,0, 0,0,0,0
mt_chan3temp dc.l 0,0,0,0,0,$00040000,0, 0,0,0,0
mt_chan4temp dc.l 0,0,0,0,0,$00080000,0, 0,0,0,0
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
mt_SongDataPtr dc.l 0
mt_speed dc.b 6
mt_counter dc.b 0
mt_SongPos dc.b 0
mt_PBreakPos dc.b 0
mt_PosJumpFlag dc.b 0
mt_PBreakFlag dc.b 0
mt_LowMask dc.b 0
mt_PattDelTime dc.b 0
mt_PattDelTime2 dc.b 0
mt_Enable dc.b 0
mt_PatternPos dc.w 0
mt_DMACONtemp dc.w 0
;/* End of File */