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SQT.a80
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SQT.a80
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; SQ-Tracker compiled song player © 1993 George K./Proxima Software
; - disassmbled & added global attenuation © 2009 mborik/SinDiKat.
; - implemented realocation of compiled song data, added status byte
; compatible with PTx and automatic fadeout © 2020 mborik/SinDiKat.
device zxspectrum128
ifndef PUREPLAYER
org #8000
demoplay di
ld sp,demoplay
call sq_init
.loop ei
halt
call sq_play
jr .loop
endif
ifndef SINGLESETUP
; bit.0 if you want to play without looping
; bit.1 if you play looped but fadeout after few seconds
; bit.7 is set each time when loop or fadeout was passed
; ...or simplified: 2 - fadeout after loop
; 1 - no loop
; 0 - loop forever
sq_status: db 2
endif
sq_init: ld de,(reloc_base) ; get the first absolute address
ld hl,buffer+10 ; which we use as base offset
xor a ; after calc buffer address - 10
sbc hl,de ; and relocate all following
push hl ; absolute pointers in music data
ld de,(reloc_endptr)
add hl,de
pop bc
relocator: dec hl
ld d,(hl)
dec hl
ld e,(hl)
ex de,hl
add hl,bc
ex de,hl
ld (hl),e
inc hl
ld (hl),d
dec hl
ld a,l
sub reloc_base % 256
jr nz,relocator
ld hl,sq_status
res 7,(hl) ; clear the loop flags
ld (chkfadeout+1),a
ld (globvol+1),a
dec a
ld (sq_rest+1),a ; reset end-song detector
ld a,8 ; player initialization
ld (chnz1),a
ld (chnz2),a
ld (chnz3),a
ld bc,#0101
call sq_rend1
chn_init: ld hl,(i_positions)
ld ix,chnz1
call sq_i9
call sq_i
call sq_i
sq_stop: ld de,#073F ; AY regs 7-12 set to silence
chn_iniloop: call out1
ld e,0
inc d
ld a,d
cp 12
jr nz,chn_iniloop
ret
sq_deadend: inc (hl) ; playback ends, sq_play is dead
jr sq_stop
sq_play: ld hl,sq_sys
dec (hl)
jr nz,chkfadeout
sq_playspeed: ld (hl),0
inc hl
dec (hl)
ld a,(hl)
or a
call z,sq_rest
cp 4
call c,sq_i
sq_pp ld ix,chnz1
ld c,36
call sq_p
ld ix,chnz2
ld c,18
call sq_p
ld ix,chnz3
ld c,9
call sq_p
chkfadeout: ld a,0 ; check if we fading out
or a
jr z,sq_c
ld a,(sq_status)
bit 7,a
jr nz,sq_deadend
countfadeout: ld a,0
dec a
ld (countfadeout+1),a
jr nz,globvol
ld a,(globvol+1)
inc a
cp 16
jr z,resetfadeout
ld (globvol+1),a
divfadeout: ld a,0
srl a
ld l,a
srl l
add a,l
jr nz,divfadeout1
inc a
divfadeout1: ld (divfadeout+1),a
add a,a
ld (countfadeout+1),a
globvol: ld a,0 ; global attenuation
ld (chnz1+11),a ; for all channels
ld (chnz2+11),a
ld (chnz3+11),a
bit 3,a ; if value of attenuation
jr z,sq_c ; hits the 8 we turn off also
ld hl,chnz1 ; flags in all channels and
ld de,chzl ; disable hw envelopes
ld c,3
globvol1: res 0,(hl) ; by reseting 0th bit
add hl,de
dec c
jr nz,globvol1
sq_c: xor a ; zero mixer register in all chans
ld l,a
ld h,a
ld (sq_n+1),hl
ld ix,chnz1
call sq_r
call sq_r
call sq_r
sq_n: ld bc,0 ; configure mixer register
ld a,b ; B = noise generators for abc
rla ; C = tone generators for abc
rla
rla
or c ; complementing because
cpl ; mixer is active in zero
sq_off: or 0 ; and apply additional chn.off
ld e,a
ld d,7 ; out to mixer register 7
out1: ld bc,#FFFD
out (c),d
ld b,#BF
out (c),e
ret
resetfadeout: ld hl,-1
ld (sq_sys),hl
ld hl,sq_status
set 7,(hl)
xor a
db 1 ; ld bc,* to skip next instruction
enablefade: ld a,48
forcefade: ld hl,chkfadeout+1
inc (hl)
ld (countfadeout+1),a
ld (divfadeout+1),a
cpl
ld (sq_rest+1),a
ret
sq_i: ld hl,0
sq_i1: ld ix,chnz1
sq_i9: ld a,(hl)
or a
jr nz,sq_i3
ld (sq_rest+1),a ; flag that if next pattern will
ld hl,(i_repeat) ; be hit we test fadeout or noloop
sq_i3: ld b,(hl)
rl b
res 5,(ix+0)
jr nc,sq_i4
set 5,(ix+0)
sq_i4: inc hl
ld a,(hl)
and 15
ld (ix+26),a
ld a,(hl)
and 240
rra
rra
rra
rra
cp 9
jr c,zbr
sub 9
cpl
zbr: ld (ix+24),a
inc hl
ld (sq_i+1),hl
ld l,b
ld h,0
ld de,(i_patterns)
add hl,de
ld e,(hl)
inc hl
ld d,(hl)
inc de
ld (ix+22),e
ld (ix+23),d
ld de,chzl
add ix,de
ld (sq_i1+2),ix
ret
sq_nofade: call resetfadeout
pop af
ret
sq_rest: ld a,-1
or a
jr nz,sq_rest0
ld a,(sq_status)
rrca ; bit 0. = noloop
jr c,sq_nofade
rrca ; bit 1. = fadeout
jr nc,sq_rest0
call enablefade
sq_rest0: ld a,(chnz1+26)
ld (chnz1+11),a
ld a,(chnz2+26)
ld (chnz2+11),a
ld a,(chnz3+26)
ld (chnz3+11),a
ld hl,(chnz1+22)
dec hl
ld b,(hl)
inc hl
ld (chnz1+18),hl
ld hl,(chnz2+22)
ld (chnz2+18),hl
ld hl,(chnz3+22)
ld (chnz3+18),hl
ld hl,(chnz1+24)
ld (chnz1+20),hl
ld hl,(chnz2+24)
ld (chnz2+20),hl
ld hl,(chnz3+24)
ld (chnz3+20),hl
ld hl,(sq_i+1)
ld c,(hl)
inc hl
ld (sq_i+1),hl
ld hl,chnz1
ld (sq_i1+2),hl
ld a,3
ld d,0
sq_rest1: res 4,(hl)
bit 5,(hl)
jr z,sq_rest2
set 4,(hl)
sq_rest2: ld e,21
add hl,de
ld (hl),d
ld e,chzl-21
add hl,de
dec a
jr nz,sq_rest1
sq_rend1: ld (sq_sys),bc
ld a,c
sq_rend2: ld (sq_playspeed+1),a
ld a,b
ret
sq_p: ld a,(ix+21)
or a
jr z,y01
dec (ix+21)
bit 7,(ix+0)
jr nz,y33
ret
y01: ld e,(ix+18)
ld d,(ix+19)
set 6,(ix+0)
res 7,(ix+0)
ld a,(de)
inc de
bit 7,a
jr z,y02
y05: ld (ix+18),e
ld (ix+19),d
ld b,a
bit 6,a
jr z,y60
dec de
ld (ix+27),e
ld (ix+28),d
y34: and 31
jp sq_smp
y60: bit 5,a
jr nz,y06
and 15
bit 4,b
jr z,y07
neg
y07: add a,(ix+12)
ld (ix+12),a
y33: ld e,(ix+27)
ld d,(ix+28)
res 6,(ix+0)
ld a,(de)
bit 7,a
jr nz,y34
inc de
jp smp_orn
y06: and 15
ld (ix+21),a
bit 4,b
ret z
or a
jr z,y33
set 7,(ix+0)
jr y33
y02: cp 96
jp c,y03
sub 96
cp 15
jr c,y04
ld hl,sq_off+1
ld b,a
ld a,(hl)
or c
ld (hl),a
set 3,(ix+0)
ld a,b
sub 15
jp z,z26
y04: dec a
ex de,hl
ld c,(hl)
inc hl
bit 6,(ix+0)
jr z,y69
ld (ix+18),l
ld (ix+19),h
res 6,(ix+0)
y69: cp 8
jr c,z38
set 0,(ix+0)
ld l,c
ld e,a
ld d,13
call out1
ld d,11
ld e,l
jp out1
z38: cp 6 ; channel volume set
jr nc,z36
bit 4,(ix+0)
ret z
or a
jr nz,z31
ld a,c
sq_v: and 15
ld (ix+11),a
ret
z31: dec a ; channel volume slide
jr nz,z32
ld a,c
add a,(ix+11)
jr sq_v
z32: dec a ; global volume set
jr nz,z33
ld a,c
ld (chnz1+11),a
ld (chnz2+11),a
ld (chnz3+11),a
ret
z33: dec a ; global volume slide
jr nz,z34
ld b,3
ld de,chzl
ld hl,chnz1+11
z33_2: ld a,(hl)
add a,c
and 15
ld (hl),a
add hl,de
djnz z33_2
ret
z34: ld hl,sq_sys ; speed set
dec a
jr nz,z35
ld a,c
sq_s: and 31
jr nz,sq_z
ld a,32
sq_z: ld (hl),a
jp sq_rend2
z35: ld a,(hl) ; speed slide
add a,c
jr sq_s
z36: sub 6
ld b,0
ld a,c
ld c,b
jr nz,z37
dec b
neg
z37: set 2,(ix+0)
ld (ix+13),c
ld (ix+14),c
ld (ix+15),a
ld (ix+16),b
ret
y03: ld (ix+12),a
dec de
ld (ix+27),e
ld (ix+28),d
inc de
call smp_orn
bit 6,(ix+0)
ret z
z26: ld (ix+18),e
ld (ix+19),d
ret
smp_orn: ld a,(de)
inc de
bit 7,a
jr z,smp_orn9
ld b,a
rra
and 31
call nz,sq_smp
bit 6,b
ret z
ld a,(de)
and 240
rr b
rra
rra
rra
srl a
call nz,sq_orn
ld a,(de)
inc de
and 15
ret z
smp_orn9: jp y04
sq_smp: push bc
add a,a
ld c,a
ld b,0
ld a,(ix+0)
and %11110000
ld (ix+0),a
ld hl,(i_samples)
add hl,bc
ld c,(hl)
inc hl
ld b,(hl)
push ix
pop hl
inc hl
ld (hl),c
inc hl
ld (hl),b
inc bc
inc bc
inc hl
ld (hl),c
inc hl
ld (hl),b
inc hl
ld (hl),32
inc hl
ld (sq_nxt+1),hl
pop bc
ld hl,sq_off+1
ld a,(hl)
or c
xor c
ld (hl),a
ret
sq_orn: add a,a
ld c,a
ld b,0
ld hl,(i_ornaments)
add hl,bc
ld c,(hl)
inc hl
ld b,(hl)
sq_nxt: ld hl,0
ld (hl),c
inc hl
ld (hl),b
inc hl
inc bc
inc bc
ld (hl),c
inc hl
ld (hl),b
inc hl
ld (hl),32
set 1,(ix+0)
ret
out2: ld hl,sq_n+1 ; carry was projected into tone
rl (hl) ; generator and disable noise
inc hl ; generator in sq_n
rl (hl)
ld a,(ix+17) ; then get channel number
add a,8 ; add 8 (AY reg number)
out (c),a ; so we change volume regs
ld b,#BF
out (c),e ; and send value in E
jp sq_zch
sq_r: ld l,(ix+3)
ld h,(ix+4)
ld bc,#FFFD
ld d,(ix+0)
ld e,0
bit 3,d ; if nothing to play, then mute
jr nz,out2
ld a,(hl)
and 15
jr nz,sq_r1
bit 0,d ; set envelopes if needed
jr z,sq_r2
ld e,16
jr sq_r2
sq_r1: sub (ix+11) ; subtract global attenuation
jr c,sq_r2 ; from actual channel volume
ld e,a
sq_r2: ld a,(ix+17) ; then get channel number
add a,8 ; add 8 (AY reg number)
out (c),a ; so we change volume regs
ld b,#BF
out (c),e
ld a,(hl)
inc hl
and 240 ; extract noise data
rra
rra
rra
ld d,6
ld e,(hl)
rl e
bit 5,(hl) ; will be noise enabled?
jr z,sq_znn
adc a,0
ld b,#FF
out (c),d
ld b,#BF
out (c),a
sq_znn: ld a,e
rla
ex de,hl
ld hl,sq_n+1 ; set sq_n to both generators
rl (hl) ; status for channel
inc hl
rla
rl (hl)
ex de,hl
ld a,(hl) ; frequency calculations...
and 31
ld d,a
inc hl
ld e,(hl)
inc hl
push de
ld d,0
dec (ix+5)
jp nz,fq_2
ld l,(ix+1)
ld h,(ix+2)
ld a,(hl)
inc hl
cp 32
ld c,(hl)
inc hl
jr nz,fq_1
set 3,(ix+0)
res 1,(ix+0)
fq_1: ld b,a
add a,a
add a,b
ld e,a
add hl,de
ld (ix+5),c
fq_2: ld (ix+3),l
ld (ix+4),h
ld a,(ix+12)
bit 1,(ix+0)
jr z,fq_5
ld l,(ix+8)
ld h,(ix+9)
add a,(hl)
inc hl
dec (ix+10)
jp nz,fq_4
ex af,af'
ld l,(ix+6)
ld h,(ix+7)
ld a,(hl)
inc hl
cp 32
ld e,b
jr z,fq_3
ld c,(hl)
ld e,a
fq_3: inc hl
add hl,de
ld (ix+10),c
ex af,af'
fq_4: ld (ix+8),l
ld (ix+9),h
fq_5: add a,(ix+20)
cp 45
jr nc,fq_6
add a,a
ld e,a
ld hl,frq2
add hl,de
ld d,(hl)
inc hl
jp fq_7
fq_6: ld hl,frq1-45
ld e,a
add hl,de
fq_7: ld e,(hl)
ex de,hl
pop de ; we got a frequency,
bit 4,d ; need we add also fine-tuning?
res 4,d
jr z,fq_9
add hl,de
db 1 ; ld bc,* to skip next instruction
fq_9: sbc hl,de
bit 2,(ix+0)
jr z,out9
ld c,(ix+13)
ld b,(ix+14)
add hl,bc
ex de,hl
ld l,(ix+15)
ld h,(ix+16)
add hl,bc
ld (ix+13),l
ld (ix+14),h
ex de,hl
out9: ld a,(ix+17) ; get channel number
add a,a ; multiply by two
ld bc,#FFFD ; and set tone frequency
out (c),a
ld b,#BF
out (c),l
inc a
ld b,#FF
out (c),a
ld b,#BF
out (c),h
sq_zch: ld de,chzl ; and skip to next channel
add ix,de ; state params with IX...
ret
frq2: db 13,93,12,156
db 11,231,11,60
db 10,155,10,2,9,115
db 8,235,8,107,7,242
db 7,128,7,20,6,174
db 6,78,5,244,5,158
db 5,79,5,1,4,185
db 4,117,4,53,3,249
db 3,192,3,138,3,87
db 3,39,2,250,2,207
db 2,167,2,129,2,93
db 2,59,2,27,1,252
db 1,224,1,197,1,172
db 1,148,1,125,1,104
db 1,83,1,64
db 1,46,1,29,1,13
frq1: db 254,240,226,214
db 202,190,180,170
db 160,151,143,135
db 127,120,113,107
db 101,95,90,85,80
db 76,71,67,64,60,57
db 53,50,48,45,42,40
db 38,36,34,32,30,28
db 27,25,24,22,21,20
db 19,18,17,16,15,14
chnz1: db 0
dw 0,0,0,0,0,0,0,0
dw 2,0,0,0,0,0
chnz2: db 0
dw 0,0,0,0,0,0,0,0
dw 1,0,0,0,0,0
chnz3: db 0
dw 0,0,0,0,0,0,0,0
dw 0,0,0,0,0,0
sq_sys: dw #0101
chzl: equ chnz2-chnz1 ; offset between channels
ifndef PUREPLAYER
; org #C000
endif
buffer: ds 2 ; song length
reloc_base:
i_samples: ds 2 ; samples lookup table address
i_ornaments: ds 2 ; ornaments lookup table address
i_patterns: ds 2 ; patterns lookup tables address
i_positions: ds 2 ; positions defitions address
i_repeat: ds 2 ; pointer to repeat position
reloc_endptr: ds 2 ; pointer to first sample definition
; and particular pattern lookup tables follows until first sample defintion...
ifndef PUREPLAYER
; song data in format as was stored in .sqt file starts at buffer label
; and it starting with absolute addresses which we need to relocate in sq_init
org buffer
; incbin "songs/music.sqt"
; incbin "songs/minimum.bin",#510
incbin "songs/happy.sqt"
; incbin "songs/boulder128menu.sqt"
savesna "SQT.sna",demoplay
endif