***********************************
***********************************
**                               **
** SoundTracker V2.0 Playroutine **
**                               **
**   Coding : The Exterminator   **
**                               **
**     © The Jungle Command      **
**                               **
***********************************
***********************************



mt_speed=$1f4

bsr		mt_init
move.w		#$4000,$dff09a
move.l		$00006c,mt_oldirq
move.l		#mt_newirq,$00006c
move.w		#$c000,$dff09a

mt_wait:
btst		#6,$bfe001
bne.s		mt_wait

move.w		#$000f,$dff096
move.w		#$4000,$dff09a
move.l		mt_oldirq,$00006c
move.w		#$c000,$dff09a
clr.l		d0
rts

mt_init:
move.l		#$00000,mt_sample1
move.l		#$00000,mt_sample2
move.l		#$00000,mt_sample3
move.l		#$00000,mt_sample4
move.l		#$00000,mt_sample5
move.l		#$00000,mt_sample6
move.l		#$00000,mt_sample7
move.l		#$00000,mt_sample8
move.l		#$00000,mt_sample9
move.l		#$00000,mt_sample10
move.l		#$00000,mt_sample11
move.l		#$00000,mt_sample12
move.l		#$00000,mt_sample13
move.l		#$00000,mt_sample14
move.l		#$00000,mt_sample15

move.l		#mt_sample1,a0
clr.l		d0
mt_clear:
move.l		(a0,d0),a1
clr.l		(a1)
addq		#4,d0
cmp.l		#$3c,d0
bne.s		mt_clear

move.w		#0,$dff0a8
move.w		#0,$dff0b8
move.w		#0,$dff0c8
move.w		#0,$dff0d8
eor.w		#$c000,mt_voice0+12
clr.l		mt_partnrplay
clr.l		mt_partnote
clr.l		mt_partpoint

move.b		mt_sampleinfo+$1d6,mt_maxpart+1
move.b		mt_sampleinfo+$1d7,mt_kn1+1
rts


mt_newirq:
movem.l		d0-d7/a0-a6,-(a7)
bsr		mt_music
movem.l		(a7)+,d0-d7/a0-a6

dc.w		$4ef9
mt_oldirq:
dc.l		0


mt_music:
addq.l		#1,mt_counter
cmp.l		#6,mt_counter
bne.s		mt_notsix
clr.l		mt_counter
bra.L		mt_rout2

mt_notsix:
lea		mt_aud1temp,a6
tst.b		3(a6)
beq.s		mt_arp1
move.l		#$dff0a0,a5		
bsr.s		mt_arprout

mt_arp1:
lea		mt_aud2temp,a6
tst.b		3(a6)
beq.s		mt_arp2
move.l		#$dff0b0,a5
bsr.s		mt_arprout

mt_arp2:
lea		mt_aud3temp,a6
tst.b		3(a6)
beq.s		mt_arp3
move.l		#$dff0c0,a5
bsr.s		mt_arprout

mt_arp3:
lea		mt_aud4temp,a6
tst.b		3(a6)
beq.s		mt_arp4
move.l		#$dff0d0,a5
bsr.s		mt_arprout
mt_arp4:
bra.L		mt_stop


mt_arprout:
tst.w	24(a6)
beq.s	mt_noslide

clr.w	d0
move.b	25(a6),d0
lsr.b	#4,d0
tst.b	d0
beq.s	mt_voldwn2
bsr.L	mt_pushvol1
bra.s	mt_noslide

mt_voldwn2:
clr.w	d0
move.b	25(a6),d0
bsr.L	mt_pushvol2

mt_noslide:
move.b	2(a6),d0
and.b	#$0f,d0
tst.b	d0
beq.L	mt_arpegrt
cmp.b	#3,d0
beq.L	mt_arpegrt
cmp.b	#4,d0
beq.L	mt_arpegrt
cmp.b	#5,d0
beq.L	mt_arpegrt
cmp.b	#1,d0
beq.s	mt_portup
cmp.b	#6,d0
beq.s	mt_portup
cmp.b	#7,d0
beq.s	mt_portup
cmp.b	#8,d0
beq.s	mt_portup
cmp.b	#2,d0
beq.s	mt_portdwn
cmp.b	#9,d0
beq.s	mt_portdwn
cmp.b	#10,d0
beq.s	mt_portdwn
cmp.b	#11,d0
beq.s	mt_portdwn
cmp.b	#13,d0
beq.s	mt_volup
rts

mt_portup:
clr.w	d0
move.b	3(a6),d0
sub.w	d0,22(a6)
cmp.w	#$71,22(a6)
bpl.s	mt_ok1
move.w	#$71,22(a6)
mt_ok1:
move.w	22(a6),6(a5)
rts

mt_portdwn:
clr.w	d0
move.b	3(a6),d0
add.w	d0,22(a6)
cmp.w	#$358,22(a6)
bmi.s	mt_ok2
move.w	#$358,22(a6)
mt_ok2:
move.w	22(a6),6(a5)
rts

mt_volup:
clr.w	d0
move.b	3(a6),d0
lsr.b	#4,d0
tst.b	d0
beq.s	mt_voldwn
mt_pushvol1:
add.w	d0,$12(a6)
cmp.w	#$40,$12(a6)
bmi.s	mt_ok3
move.w	#$40,$12(a6)
mt_ok3:
move.w	$12(a6),8(a5)
rts

mt_voldwn:
clr.w	d0
move.b	3(a6),d0
mt_pushvol2:
and.b	#$0f,d0
sub.w	d0,$12(a6)
bpl.s	mt_ok4
clr.w	$12(a6)
mt_ok4:
move.w	$12(a6),8(a5)
rts

mt_arpegrt:
cmp.l		#1,mt_counter
beq.s		mt_loop2
cmp.l		#2,mt_counter
beq.s		mt_loop3
cmp.l		#3,mt_counter
beq.s		mt_loop4
cmp.l		#4,mt_counter
beq.s		mt_loop2
cmp.l		#5,mt_counter
beq.s		mt_loop3
rts

mt_loop2:
clr.l		d0
move.b		3(a6),d0
lsr.b		#4,d0
bra.s		mt_cont

mt_loop3:
clr.l		d0
move.b		3(a6),d0
and.b		#$0f,d0
bra.s		mt_cont

mt_loop4:
move.w		16(a6),d2
bra.s		mt_endpart

mt_cont:
lsl.w		#1,d0
clr.l		d1
move.w		16(a6),d1
lea		mt_arpeggio,a0
mt_loop5:
move.w		(a0,d0),d2
cmp.w		(a0),d1
beq.s		mt_endpart
addq.l		#2,a0
bra.s		mt_loop5

mt_endpart:
move.w		d2,6(a5)
rts

mt_rout2:
lea		mt_sampleinfo,a0
move.l		a0,a3
add.l		#$0c,a3
move.l		a0,a2
add.l		#$1d8,a2
add.l		#$258,a0
move.l		mt_partnrplay,d0
clr.l		d1
move.b		(a2,d0),d1
mulu		#$0400,d1
add.l		mt_partnote,d1
move.l		d1,mt_partpoint
clr.w		mt_dmacon

move.l		#$dff0a0,a5
lea		mt_aud1temp,a6
bsr.L		mt_playit

move.l		#$dff0b0,a5
lea		mt_aud2temp,a6
bsr.L		mt_playit

move.l		#$dff0c0,a5
lea		mt_aud3temp,a6
bsr.L		mt_playit

move.l		#$dff0d0,a5
lea		mt_aud4temp,a6
bsr.L		mt_playit

move.l		#mt_speed,d0
mt_rls:
dbf		d0,mt_rls

move.l		#$8000,d0
add.w		mt_dmacon,d0
move.w		d0,$dff096

move.l		#mt_aud4temp,a6
cmp.w		#1,14(a6)
bne.s		mt_voice3
move.l		10(a6),$dff0d0
move.w		#1,$dff0d4
mt_voice3:
move.l		#mt_aud3temp,a6
cmp.w		#1,14(a6)
bne.s		mt_voice2
move.l		10(a6),$dff0c0
move.w		#1,$dff0c4
mt_voice2:
move.l		#mt_aud2temp,a6
cmp.w		#1,14(a6)
bne.s		mt_voice1
move.l		10(a6),$dff0b0
move.w		#1,$dff0b4
mt_voice1:
move.l		#mt_aud1temp,a6
cmp.w		#1,14(a6)
bne.s		mt_voice0
move.l		10(a6),$dff0a0
move.w		#1,$dff0a4

mt_voice0:
lea		mt_modulate,a0
move.l		mt_partnote,d0
lsl.b		#7,d0
add.l		#$10,d0
move.l		d0,mt_partnote
cmp.l		#$400,d0
bne.s		mt_stop
clr.l		mt_partnote
addq.l		#1,mt_partnrplay
clr.l		d0
move.w		mt_maxpart,d0
move.l		mt_partnrplay,d1
cmp.l		d0,d1
bne.s		mt_stop
clr.l		mt_partnrplay
mt_stop:
rts


mt_playit:
move.l		(a0,d1),(a6)
addq.l		#4,d1
clr.l		d2
move.b		2(a6),d2
and.b		#$f0,d2
lsr.b		#4,d2
tst.b		d2
beq.s		mt_nosamplechange

clr.l		d3
lea		mt_samples,a1
move.l		d2,d4
mulu		#4,d2
mulu		#$1e,d4
move.l		(a1,d2),4(a6)
move.w		(a3,d4),8(a6)
move.w		2(a3,d4),18(a6)
move.w		4(a3,d4),d3
tst.w		d3
beq.s		mt_displace
move.l		4(a6),d2
add.l		d3,d2
move.l		d2,4(a6)
move.l		d2,10(a6)
move.w		6(a3,d4),8(a6)
move.w		6(a3,d4),14(a6)
move.w		18(a6),8(a5)
bra.s		mt_nosamplechange
mt_displace:
move.l		4(a6),d2
add.l		d3,d2
move.l		d2,10(a6)
move.w		6(a3,d4),14(a6)
move.w		18(a6),8(a5)
mt_nosamplechange:
tst.w		(a6)
beq.s		mt_retrout
move.w		(a6),16(a6)
move.w		20(a6),$dff096
move.l		4(a6),(a5)
move.w		8(a6),4(a5)
move.w		(a6),6(a5)
move.w		20(a6),d0
or.w		d0,mt_dmacon

mt_retrout:
move.w	20(a6),d0
lsl.w	#4,d0
add.w	20(a6),d0
move.w	d0,$dff09e

tst.w	(a6)
beq.s	mt_nonewper
move.w	(a6),22(a6)
mt_nonewper:

move.b	2(a6),d0
and.b	#$0f,d0
cmp.b	#14,d0
bne.s	mt_noset
move.w	2(a6),24(a6)
rts
mt_noset:
tst.b	3(a6)
bne.s	mt_noclr
clr.w	24(a6)
mt_noclr:
cmp.b	#3,d0
beq.s	mt_modvol
cmp.b	#6,d0
beq.s	mt_modvol
cmp.b	#9,d0
beq.s	mt_modvol
cmp.b	#4,d0
beq.s	mt_modper
cmp.b	#7,d0
beq.s	mt_modper
cmp.b	#10,d0
beq.s	mt_modper
cmp.b	#5,d0
beq.s	mt_modvolper
cmp.b	#8,d0
beq.s	mt_modvolper
cmp.b	#11,d0
beq.s	mt_modvolper
cmp.b	#12,d0
bne.s	mt_nochnge
move.b	3(a6),8(a5)
mt_nochnge:
rts

mt_modvol:
move.w	20(a6),d0
bra.s	mt_push

mt_modper:
move.w	20(a6),d0
lsl.w	#4,d0
bra.s	mt_push

mt_modvolper:
move.w	20(a6),d0
lsl.w	#4,d0
add.w	20(a6),d0

mt_push:
add.w	#$8000,d0
move.w	d0,$dff09e
rts


mt_aud1temp:
dc.w $0000,$0000,$0000,$0000,$0000,$0000,$0000,$0000
dc.w $0000,$0000,$0001,$0000,$0000
mt_aud2temp:
dc.w $0000,$0000,$0000,$0000,$0000,$0000,$0000,$0000
dc.w $0000,$0000,$0002,$0000,$0000
mt_aud3temp:
dc.w $0000,$0000,$0000,$0000,$0000,$0000,$0000,$0000
dc.w $0000,$0000,$0004,$0000,$0000
mt_aud4temp:
dc.w $0000,$0000,$0000,$0000,$0000,$0000,$0000,$0000
dc.w $0000,$0000,$0008,$0000,$0000
mt_partnote:
dc.l 0
mt_partnrplay:
dc.l 0
mt_counter:
dc.l 0
mt_partpoint:
dc.l 0
mt_samples:
dc.w $0000,$0000
mt_sample1:
dc.l 0
mt_sample2:
dc.l 0
mt_sample3:
dc.l 0
mt_sample4:
dc.l 0
mt_sample5:
dc.l 0
mt_sample6:
dc.l 0
mt_sample7:
dc.l 0
mt_sample8:
dc.l 0
mt_sample9:
dc.l 0
mt_sample10:
dc.l 0
mt_sample11:
dc.l 0
mt_sample12:
dc.l 0
mt_sample13:
dc.l 0
mt_sample14:
dc.l 0
mt_sample15:
dc.l 0
mt_maxpart:
dc.w $0000
mt_kn1:
dc.w $0000
mt_dmacon:
dc.w $0000

mt_modulate:
dc.w $0c39,$0039,$00bf,$ec01,$6630,$0839,$0007,$00bf
dc.w $e001,$6626,$2c79,$0000,$0004,$43fa,$0020,$4eae
dc.w $fe68,$2c40,$4280,$41fa,$0026,$223c,$0000,$0032
dc.w $4eae,$ffa6,$60ee,$0000,$0000,$4e75,$696e,$7475
dc.w $6974,$696f,$6e2e,$6c69,$6272,$6172,$7900,$0104
dc.w $1753,$6f75,$6e64,$5472,$6163,$6b65,$7220,$5632
dc.w $0063,$00f0,$20a9,$2054,$6865,$204a,$756e,$676c
dc.w $6520,$436f,$6d6d,$616e,$6400,$0000

mt_arpeggio:
dc.w $0358,$0328,$02fa,$02d0,$02a6,$0280,$025c
dc.w $023a,$021a,$01fc,$01e0,$01c5,$01ac,$0194,$017d
dc.w $0168,$0153,$0140,$012e,$011d,$010d,$00fe,$00f0
dc.w $00e2,$00d6,$00ca,$00be,$00b4,$00aa,$00a0,$0097
dc.w $008f,$0087,$007f,$0078,$0071,$0000,$0000,$0000

mt_sampleinfo: