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Z_PTZX.asm
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Z_PTZX.asm
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;Vortex Tracker II v1.0 PT3 player for ZX Spectrum
;ROM version (specially for Axor)
;(c)2004,2007 S.V.Bulba <vorobey@mail.khstu.ru>
;http://bulba.untergrund.net (http://bulba.at.kz)
;Release number
;Release EQU "MOR7"
;Features
;--------
;-Can run in ROM (self-modified code is not used).
;-Can be compiled at any address (i.e. no need rounding ORG
; address).
;-Variables (VARS) can be located at any address (not only after
;code block).
;-INIT subroutine detects module version and rightly generates
; both note and volume tables outside of code block (in VARS).
;-Two portamento (spc. command 3xxx) algorithms (depending of
; module version).
;-New 1.XX and 2.XX special command behaviour (only for PT v3.7
; and higher).
;-Any Tempo value are accepted (including Tempo=1 and Tempo=2).
;-Fully compatible with Ay_Emul PT3 player codes.
;-See also notes at the end of this source code.
;Warning!!! PLAY subroutine can crash if no module are loaded
;into RAM or INIT subroutine was not called before.
;Call MUTE or INIT one more time to mute sound after stopping
;playing
;Test codes (commented)
; CALL START
; EI
;_LP HALT
; CALL START+5
; XOR A
; IN A,($FE)
; CPL
; AND 15
; JR Z,_LP
; JR START+8
DEFC TonA = 0
DEFC TonB = 2
DEFC TonC = 4
DEFC Noise = 6
DEFC Mixer = 7
DEFC AmplA = 8
DEFC AmplB = 9
DEFC AmplC = 10
DEFC Env = 11
DEFC EnvTp = 13
;Entry and other points
;START initialization
;START+3 initialization with module address in HL
;START+5 play one quark
;START+8 mute
;START+10 setup and status flags
;START+11 pointer to current position value in PT3 module;
;After INIT (START+11) points to Postion0-1 (optimization)
START:
LD HL,MDLADDR
JR INIT
JP PLAY
JR MUTE
;Identifier
DEFM "=VTII PT3 Player MOR7="
CHECKLP:
LD HL,SETUP
SET 7,(HL)
BIT 0,(HL)
RET Z
POP HL
LD HL,DelyCnt
INC (HL)
LD HL,ChanA+CHP_NtSkCn
INC (HL)
MUTE:
XOR A
LD H,A
LD L,A
LD (AYREGS+AmplA),A
LD (AYREGS+AmplB),HL
JP ROUT_A0
INIT:
;HL - AddressOfModule
LD (MODADDR),HL
PUSH HL
LD DE,100
ADD HL,DE
LD A,(HL)
LD (Delay),A
PUSH HL
POP IX
ADD HL,DE
LD (CrPsPtr),HL
LD E,(IX+102-100)
ADD HL,DE
INC HL
LD (LPosPtr),HL
POP DE
LD L,(IX+103-100)
LD H,(IX+104-100)
ADD HL,DE
LD (PatsPtr),HL
LD HL,169
ADD HL,DE
LD (OrnPtrs),HL
LD HL,105
ADD HL,DE
LD (SamPtrs),HL
LD HL,SETUP
RES 7,(HL)
;note table data depacker
LD DE,T_PACK
LD BC,T1_+(2*49)-1
TP_0:
LD A,(DE)
INC DE
CP 15*2
JR NC,TP_1
LD H,A
LD A,(DE)
LD L,A
INC DE
JR TP_2
TP_1:
PUSH DE
LD D,0
LD E,A
ADD HL,DE
ADD HL,DE
POP DE
TP_2:
LD A,H
LD (BC),A
DEC BC
LD A,L
LD (BC),A
DEC BC
;SUB $F8*2
SUB $F0
;in compiled SUB $F0
JR NZ,TP_0
LD HL,VAR0START
LD (HL),A
LD DE,VAR0START+1
LD BC,VAR0END-VAR0START-1
LDIR
INC A
LD (DelyCnt),A
LD HL,$F001 ;H - CHP.Volume, L - CHP.NtSkCn
LD (ChanA+CHP_NtSkCn),HL
LD (ChanB+CHP_NtSkCn),HL
LD (ChanC+CHP_NtSkCn),HL
LD HL,EMPTYSAMORN
LD (AdInPtA),HL ;ptr to zero
LD (ChanA+CHP_OrnPtr),HL ;ornament 0 is "0,1,0"
LD (ChanB+CHP_OrnPtr),HL ;in all versions from
LD (ChanC+CHP_OrnPtr),HL ;3.xx to 3.6x and VTII
LD (ChanA+CHP_SamPtr),HL ;S1 There is no default
LD (ChanB+CHP_SamPtr),HL ;S2 sample in PT3, so, you
LD (ChanC+CHP_SamPtr),HL ;S3 can comment S1,2,3; see
;also EMPTYSAMORN comment
LD A,(IX+13-100) ;EXTRACT VERSION NUMBER
SUB $30
JR C,L20
CP 10
JR C,L21
L20:
LD A,6
L21:
LD (Version),A
PUSH AF
CP 4
WTF1:
LD A,(IX+99-100) ;TONE TABLE NUMBER
RLA
AND 7
;NoteTableCreator (c) Ivan Roshin
;A - NoteTableNumber*2+VersionForNoteTable
;(xx1b - 3.xx..3.4r, xx0b - 3.4x..3.6x..VTII1.0)
LD HL,NT_DATA
PUSH DE
LD D,B
ADD A,A
LD E,A
ADD HL,DE
LD E,(HL)
INC HL
SRL E
SBC A,A
AND $A7 ;$00 (NOP) or $A7 (AND A)
LD (L3),A
LD A,201 ;RET temporary
LD (L3+1),A ;temporary
EX DE,HL
POP BC ;BC=T1_
ADD HL,BC
LD A,(DE)
;attention error $C103
ERROR2:
;ADD A,T_ ;original
ADD A, $EB ;compiled
;seems ok
LD C,A
ADC A,T_/256
SUB C
LD B,A
PUSH BC
LD DE,NT_
PUSH DE
LD B,12
L1:
PUSH BC
LD C,(HL)
INC HL
PUSH HL
LD B,(HL)
PUSH DE
EX DE,HL
LD DE,23
LD IXH,8
L2:
SRL B
RR C
CALL L3 ;temporary
;L3 DB $19 ;AND A or NOP
LD A,C
ADC A,D ;=ADC 0
LD (HL),A
INC HL
LD A,B
ADC A,D
LD (HL),A
ADD HL,DE
DEC IXH
JR NZ,L2
POP DE
INC DE
INC DE
POP HL
INC HL
POP BC
DJNZ L1
POP HL
POP DE
LD A,E
;attention error $C13C
ERROR3:
;CP TCOLD_1 ;original
CP $F7 ;compiled
;seems ok
JR NZ,CORR_1
LD A,$FD
LD (NT_+$2E),A
CORR_1:
LD A,(DE)
AND A
JR Z,TC_EXIT
RRA
PUSH AF
ADD A,A
LD C,A
ADD HL,BC
POP AF
JR NC,CORR_2
DEC (HL)
DEC (HL)
CORR_2:
INC (HL)
AND A
SBC HL,BC
INC DE
JR CORR_1
TC_EXIT:
POP AF
;VolTableCreator (c) Ivan Roshin
;A - VersionForVolumeTable (0..4 - 3.xx..3.4x;
;5.. - 3.5x..3.6x..VTII1.0)
CP 5
LD HL,$11
LD D,H
LD E,H
LD A,$17
JR NC,M1
DEC L
LD E,L
XOR A
M1:
LD (M2),A
LD IX,VT_+16
LD C,$10
INITV2:
PUSH HL
ADD HL,DE
EX DE,HL
SBC HL,HL
INITV1:
LD A,L
;M2 DB $7D
CALL M2 ;temporary
LD A,H
ADC A,0
LD (IX),A
INC IX
ADD HL,DE
INC C
LD A,C
AND 15
JR NZ,INITV1
POP HL
LD A,E
CP $77
JR NZ,M3
INC E
M3:
LD A,C
AND A
JR NZ,INITV2
JP ROUT_A0
;pattern decoder
PD_OrSm:
LD (IX-12+CHP_Env_En),0
CALL SETORN
LD A,(BC)
INC BC
RRCA
PD_SAM:
ADD A,A
PD_SAM_:
LD E,A
LD D,0
;SamPtrs EQU $+1
; LD HL,$2121
LD HL,(SamPtrs)
ADD HL,DE
LD E,(HL)
INC HL
LD D,(HL)
;MODADDR EQU $+1
; LD HL,$2121
LD HL,(MODADDR)
ADD HL,DE
LD (IX-12+CHP_SamPtr),L
LD (IX-12+CHP_SamPtr+1),H
JR PD_LOOP
PD_VOL:
RLCA
RLCA
RLCA
RLCA
LD (IX-12+CHP_Volume),A
JR PD_LP2
PD_EOff:
LD (IX-12+CHP_Env_En),A
LD (IX-12+CHP_PsInOr),A
JR PD_LP2
PD_SorE:
DEC A
JR NZ,PD_ENV
LD A,(BC)
INC BC
LD (IX-12+CHP_NNtSkp),A
JR PD_LP2
PD_ENV:
CALL SETENV
JR PD_LP2
PD_ORN:
CALL SETORN
JR PD_LOOP
PD_ESAM:
LD (IX-12+CHP_Env_En),A
LD (IX-12+CHP_PsInOr),A
CALL NZ,SETENV
LD A,(BC)
INC BC
JR PD_SAM_
PTDECOD:
LD A,(IX-12+CHP_Note)
; LD (PrNote+1),A
LD (PrNote),A
LD L,(IX-12+CHP_CrTnSl)
LD H,(IX-12+CHP_CrTnSl+1)
; LD (PrSlide+1),HL
LD (PrSlide),HL
PD_LOOP:
LD DE,$2010
PD_LP2:
LD A,(BC)
INC BC
ADD A,E
JR C,PD_OrSm
ADD A,D
JR Z,PD_FIN
JR C,PD_SAM
ADD A,E
JR Z,PD_REL
JR C,PD_VOL
ADD A,E
JR Z,PD_EOff
JR C,PD_SorE
ADD A,96
JR C,PD_NOTE
ADD A,E
JR C,PD_ORN
ADD A,D
JR C,PD_NOIS
ADD A,E
JR C,PD_ESAM
ADD A,A
LD E,A
;attention error ;$C220
;ERROR4
; LD HL,SPCCOMS+$FF20-$2000
;jump table @ line 648
PUSH DE
LD DE,0xDF20
LD HL,SPCCOMS
ADD HL,DE
POP DE
ADD HL,DE
LD E,(HL)
INC HL
LD D,(HL)
PUSH DE
JR PD_LOOP
PD_NOIS:
LD (Ns_Base),A
JR PD_LP2
PD_REL:
RES 0,(IX-12+CHP_Flags)
JR PD_RES
PD_NOTE:
LD (IX-12+CHP_Note),A
SET 0,(IX-12+CHP_Flags)
XOR A
PD_RES:
;LD (PDSP_+1),SP
LD (PDSP_),SP
LD SP,IX
LD H,A
LD L,A
PUSH HL
PUSH HL
PUSH HL
PUSH HL
PUSH HL
PUSH HL
;PDSP_ LD SP,$3131
LD SP,(PDSP_)
PD_FIN:
LD A,(IX-12+CHP_NNtSkp)
LD (IX-12+CHP_NtSkCn),A
RET
C_PORTM:
RES 2,(IX-12+CHP_Flags)
LD A,(BC)
INC BC
;SKIP PRECALCULATED TONE DELTA (BECAUSE
;CANNOT BE RIGHT AFTER PT3 COMPILATION)
INC BC
INC BC
LD (IX-12+CHP_TnSlDl),A
LD (IX-12+CHP_TSlCnt),A
LD DE,NT_
LD A,(IX-12+CHP_Note)
LD (IX-12+CHP_SlToNt),A
ADD A,A
LD L,A
LD H,0
ADD HL,DE
LD A,(HL)
INC HL
LD H,(HL)
LD L,A
PUSH HL
;PrNote LD A,$3E
LD A,(PrNote)
LD (IX-12+CHP_Note),A
ADD A,A
LD L,A
LD H,0
ADD HL,DE
LD E,(HL)
INC HL
LD D,(HL)
POP HL
SBC HL,DE
LD (IX-12+CHP_TnDelt),L
LD (IX-12+CHP_TnDelt+1),H
LD E,(IX-12+CHP_CrTnSl)
LD D,(IX-12+CHP_CrTnSl+1)
;Version EQU $+1
; LD A,$3E
LD A,(Version)
CP 6
JR C,OLDPRTM ;Old 3xxx for PT v3.5-
;PrSlide LD DE,$1111
LD DE,(PrSlide)
LD (IX-12+CHP_CrTnSl),E
LD (IX-12+CHP_CrTnSl+1),D
OLDPRTM:
LD A,(BC) ;SIGNED TONE STEP
INC BC
EX AF,AF'
LD A,(BC)
INC BC
AND A
JR Z,NOSIG
EX DE,HL
NOSIG:
SBC HL,DE
JP P,SET_STP
CPL
EX AF,AF'
NEG
EX AF,AF'
SET_STP:
LD (IX-12+CHP_TSlStp+1),A
EX AF,AF'
LD (IX-12+CHP_TSlStp),A
LD (IX-12+CHP_COnOff),0
RET
C_GLISS:
SET 2,(IX-12+CHP_Flags)
LD A,(BC)
INC BC
LD (IX-12+CHP_TnSlDl),A
AND A
JR NZ,GL36
LD A,(Version) ;AlCo PT3.7+
CP 7
SBC A,A
INC A
GL36:
LD (IX-12+CHP_TSlCnt),A
LD A,(BC)
INC BC
EX AF,AF'
LD A,(BC)
INC BC
JR SET_STP
C_SMPOS:
LD A,(BC)
INC BC
LD (IX-12+CHP_PsInSm),A
RET
C_ORPOS:
LD A,(BC)
INC BC
LD (IX-12+CHP_PsInOr),A
RET
C_VIBRT:
LD A,(BC)
INC BC
LD (IX-12+CHP_OnOffD),A
LD (IX-12+CHP_COnOff),A
LD A,(BC)
INC BC
LD (IX-12+CHP_OffOnD),A
XOR A
LD (IX-12+CHP_TSlCnt),A
LD (IX-12+CHP_CrTnSl),A
LD (IX-12+CHP_CrTnSl+1),A
RET
C_ENGLS:
LD A,(BC)
INC BC
LD (Env_Del),A
LD (CurEDel),A
LD A,(BC)
INC BC
LD L,A
LD A,(BC)
INC BC
LD H,A
LD (ESldAdd),HL
RET
C_DELAY:
LD A,(BC)
INC BC
LD (Delay),A
RET
SETENV:
LD (IX-12+CHP_Env_En),E
LD (AYREGS+EnvTp),A
LD A,(BC)
INC BC
LD H,A
LD A,(BC)
INC BC
LD L,A
LD (EnvBase),HL
XOR A
LD (IX-12+CHP_PsInOr),A
LD (CurEDel),A
LD H,A
LD L,A
LD (CurESld),HL
C_NOP:
RET
SETORN:
ADD A,A
LD E,A
LD D,0
LD (IX-12+CHP_PsInOr),D
;OrnPtrs EQU $+1
; LD HL,$2121
LD HL,(OrnPtrs)
ADD HL,DE
LD E,(HL)
INC HL
LD D,(HL)
;MDADDR2 EQU $+1
; LD HL,$2121
LD HL,(MODADDR)
ADD HL,DE
LD (IX-12+CHP_OrnPtr),L
LD (IX-12+CHP_OrnPtr+1),H
RET
;ALL 16 ADDRESSES TO PROTECT FROM BROKEN PT3 MODULES
SPCCOMS:
defw C_NOP
defw C_GLISS
defw C_PORTM
defw C_SMPOS
defw C_ORPOS
defw C_VIBRT
defw C_NOP
defw C_NOP
defw C_ENGLS
defw C_DELAY
defw C_NOP
defw C_NOP
defw C_NOP
defw C_NOP
defw C_NOP
defw C_NOP
CHREGS:
XOR A
LD (Ampl),A
BIT 0,(IX+CHP_Flags)
PUSH HL
JP Z,CH_EXIT
; LD (CSP_+1),SP
LD (CSP_),SP
LD L,(IX+CHP_OrnPtr)
LD H,(IX+CHP_OrnPtr+1)
LD SP,HL
POP DE
LD H,A
LD A,(IX+CHP_PsInOr)
LD L,A
ADD HL,SP
INC A
CP D
JR C,CH_ORPS
LD A,E
CH_ORPS:
LD (IX+CHP_PsInOr),A
LD A,(IX+CHP_Note)
ADD A,(HL)
JP P,CH_NTP
XOR A
CH_NTP:
CP 96
JR C,CH_NOK
LD A,95
CH_NOK:
ADD A,A
EX AF,AF'
LD L,(IX+CHP_SamPtr)
LD H,(IX+CHP_SamPtr+1)
LD SP,HL
POP DE
LD H,0
LD A,(IX+CHP_PsInSm)
LD B,A
ADD A,A
ADD A,A
LD L,A
ADD HL,SP
LD SP,HL
LD A,B
INC A
CP D
JR C,CH_SMPS
LD A,E
CH_SMPS:
LD (IX+CHP_PsInSm),A
POP BC
POP HL
LD E,(IX+ CHP_TnAcc)
LD D,(IX+ CHP_TnAcc+1)
ADD HL,DE
BIT 6,B
JR Z,CH_NOAC
LD (IX+ CHP_TnAcc),L
LD (IX+ CHP_TnAcc+1),H
CH_NOAC:
EX DE,HL
EX AF,AF'
LD L,A
LD H,0
LD SP,NT_
ADD HL,SP
LD SP,HL
POP HL
ADD HL,DE
LD E,(IX+CHP_CrTnSl)
LD D,(IX+CHP_CrTnSl+1)
ADD HL,DE
;CSP_ LD SP,$3131
LD SP,(CSP_)
EX (SP),HL
XOR A
OR (IX+CHP_TSlCnt)
JR Z,CH_AMP
DEC (IX+CHP_TSlCnt)
JR NZ,CH_AMP
LD A,(IX+CHP_TnSlDl)
LD (IX+CHP_TSlCnt), A
LD L,(IX+CHP_TSlStp)
LD H,(IX+CHP_TSlStp+1)
LD A,H
ADD HL,DE
LD (IX+CHP_CrTnSl),L
LD (IX+CHP_CrTnSl+1),H
BIT 2,(IX+CHP_Flags)
JR NZ,CH_AMP
LD E,(IX+CHP_TnDelt)
LD D,(IX+CHP_TnDelt+1)
AND A
JR Z,CH_STPP
EX DE,HL
CH_STPP:
SBC HL,DE
JP M,CH_AMP
LD A,(IX+CHP_SlToNt)
LD (IX+CHP_Note),A
XOR A
LD (IX+CHP_TSlCnt),A
LD (IX+CHP_CrTnSl),A
LD (IX+CHP_CrTnSl+1),A
CH_AMP:
LD A,(IX+CHP_CrAmSl)
BIT 7,C
JR Z,CH_NOAM
BIT 6,C
JR Z,CH_AMIN
CP 15
JR Z,CH_NOAM
INC A
JR CH_SVAM
CH_AMIN:
CP -15
JR Z,CH_NOAM
DEC A
CH_SVAM:
LD (IX+CHP_CrAmSl),A
CH_NOAM:
LD L,A
LD A,B
AND 15
ADD A,L
JP P,CH_APOS
XOR A
CH_APOS:
CP 16
JR C,CH_VOL
LD A,15
CH_VOL:
OR (IX+CHP_Volume)
LD L,A
LD H,0
LD DE,VT_
ADD HL,DE
LD A,(HL)
CH_ENV:
BIT 0,C
JR NZ,CH_NOEN
OR (IX+CHP_Env_En)
CH_NOEN:
LD (Ampl),A
BIT 7,B
LD A,C
JR Z,NO_ENSL
RLA
RLA
SRA A
SRA A
SRA A
ADD A,(IX+CHP_CrEnSl) ;SEE COMMENT BELOW
BIT 5,B
JR Z,NO_ENAC
LD (IX+CHP_CrEnSl),A
NO_ENAC:
LD HL,AddToEn
ADD A,(HL) ;BUG IN PT3 - NEED WORD HERE.
;FIX IT IN NEXT VERSION?
LD (HL),A
JR CH_MIX
NO_ENSL:
RRA
ADD A,(IX+CHP_CrNsSl)
LD (AddToNs),A
BIT 5,B
JR Z,CH_MIX
LD (IX+CHP_CrNsSl),A
CH_MIX:
LD A,B
RRA
AND $48
CH_EXIT:
LD HL,AYREGS+Mixer
OR (HL)
RRCA
LD (HL),A
POP HL
XOR A
OR (IX+CHP_COnOff)
RET Z
DEC (IX+CHP_COnOff)
RET NZ
XOR (IX+CHP_Flags)
LD (IX+CHP_Flags),A
RRA
LD A,(IX+CHP_OnOffD)
JR C,CH_ONDL
LD A,(IX+CHP_OffOnD)
CH_ONDL:
LD (IX+CHP_COnOff),A
RET
PLAY:
XOR A
LD (AddToEn),A
LD (AYREGS+Mixer),A
DEC A
LD (AYREGS+EnvTp),A
LD HL,DelyCnt
DEC (HL)
JP NZ,PL2
LD HL,ChanA+CHP_NtSkCn
DEC (HL)
JR NZ,PL1B
;AdInPtA EQU $+1
; LD BC,$0101
LD BC,(AdInPtA)
LD A,(BC)
AND A
JR NZ,PL1A
LD D,A
LD (Ns_Base),A
LD HL,(CrPsPtr)
INC HL
LD A,(HL)
INC A
JR NZ,PLNLP
CALL CHECKLP
;LPosPtr EQU $+1
; LD HL,$2121
LD HL,(LPosPtr)
LD A,(HL)
INC A
PLNLP:
LD (CrPsPtr),HL
DEC A
ADD A,A
LD E,A
RL D
;PatsPtr EQU $+1
; LD HL,$2121
LD HL,(PatsPtr)
ADD HL,DE
LD DE,(MODADDR)
; LD (PSP_+1),SP
LD (PSP_),SP
LD SP,HL
POP HL
ADD HL,DE
LD B,H
LD C,L
POP HL
ADD HL,DE
LD (AdInPtB),HL
POP HL
ADD HL,DE
LD (AdInPtC),HL
;PSP_ LD SP,$3131
LD SP,(PSP_)
PL1A:
LD IX,ChanA+12
CALL PTDECOD
LD (AdInPtA),BC
PL1B:
LD HL,ChanB+CHP_NtSkCn
DEC (HL)
JR NZ,PL1C
LD IX,ChanB+12
;AdInPtB EQU $+1
; LD BC,$0101
LD BC,(AdInPtB)
CALL PTDECOD
LD (AdInPtB),BC