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player.s
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player.s
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;------------------------------------------------------------------------------------
;
; Please note this was mostly to learn the process
; also note O'Dog of Laxity you and your group can FUCK right off.
; Don't pre-release games for the 4kb compo which technically disqualified my entry
; And killed a lot of my passion for doing C64 titles
;
; Thanks to
; Frantic/Hack'n'Trade player was a point of reference when re-educating myself with SID
; https://cadaver.github.io/rants/music.html this page was useful too
;
;------------------------------------------------------------------------------------
;------------------------------------------------------------------------------------
; Player Reset
; A = song ID
; X = trashed
; Y = trashed
;------------------------------------------------------------------------------------
player_Reset_func
; mul A * 2
asl
tay
; clear the data we need
; overkill
ldx #$00
_clearloop
lda #$20
sta TRACK0,x
lda #$00
sta $d400,x
inx
cpx #3*7
bne _clearloop
; get song pointers and set up VPEEK
lda Songs,y
sta VPEEK
lda Songs+1,y
sta VPEEK+1
; set the voice track pointers from the song def
; 3 words
ldy #$00
lda (VPEEK),y
sta TRACK0.Address
iny
lda (VPEEK),y
sta TRACK0.Address+1
iny
lda (VPEEK),y
sta TRACK1.Address
iny
lda (VPEEK),y
sta TRACK1.Address+1
iny
lda (VPEEK),y
sta TRACK2.Address
iny
lda (VPEEK),y
sta TRACK2.Address+1
; set Clock to zero
lda #$01
sta TRACK0.Clock
sta TRACK1.Clock
sta TRACK2.Clock
; defaults
lda #$03
sta TRACK0.Instrument
lda #$02
sta TRACK1.Instrument
lda #$03
sta TRACK2.Instrument
lda #%01111111 ;Hi-pass + Lo-pass filter on.
sta $d418
rts
player_Update_func:
ldx #$00
; Track 0
sec
dec TRACK0.Clock,x
bne _noupdate0
jsr InitialUpdate
_noupdate0
; Track 1
; X is 7 due to using SID regs,x
; so this is the voice 2
ldx #$07
sec
dec TRACK0.Clock,x
bne _noupdate1
jsr InitialUpdate
_noupdate1
; Track 2
; X is 14 due to using SID regs,x
; so this is the voice 3
ldx #14
sec
dec TRACK0.Clock,x
bne _noupdate2
jsr InitialUpdate
_noupdate2
rts
;------------------------------------------------------------------------------------
; BeginRepeat:
; stored as command byte , count byte
; copies the repeat amount and stores a pointer back to the beginning of the repeat ( skipping the header )
;------------------------------------------------------------------------------------
BeginRepeat:
; move ptr
NextCommand TRACK0
PeekCommand TRACK0
sta TRACK0.RepeatCounter,x
NextCommand TRACK0
; copy Address
lda TRACK0.Address,x
sta TRACK0.RepeatAddress,x
lda TRACK0.Address+1,x
sta TRACK0.RepeatAddress+1,x
jmp updateV0
;------------------------------------------------------------------------------------
; EndRepeat: reset back to repeat point if saved repeat count = 0
; stored as command byte
;------------------------------------------------------------------------------------
EndRepeat:
dec TRACK0.RepeatCounter,x
clc
lda TRACK0.RepeatCounter,x
beq _SkipReptByte
lda TRACK0.RepeatAddress,x
sta TRACK0.Address,x
lda TRACK0.RepeatAddress+1,x
sta TRACK0.Address+1,x
jmp updateV0
_SkipReptByte:
NextCommand TRACK0
jmp updateV0
;------------------------------------------------------------------------------------
; JumpTrack:
; unconditional jump the track pointer to the word after the command byte
;------------------------------------------------------------------------------------
JumpTrack:
; move ptr
NextCommand TRACK0
PeekCommand TRACK0
sta JmpFunc
NextCommand TRACK0
PeekCommand TRACK0
; copy Address
sta TRACK0.Address+1,x
lda JmpFunc
sta TRACK0.Address,x
jmp updateV0
;------------------------------------------------------------------------------------
; Set the track instrument to the next byte
;------------------------------------------------------------------------------------
SetInstrument:
; next instruction
NextCommand TRACK0
PeekCommand TRACK0
; store that number into the current Instrument
sta TRACK0.Instrument,x
; step to next instruction
NextCommand TRACK0
jmp updateV0
;------------------------------------------------------------------------------------
; Command Functions array
;------------------------------------------------------------------------------------
PlayerFunctions:
.word SkipNote,BeginRepeat,EndRepeat,SetInstrument,JumpTrack
;------------------------------------------------------------------------------------
; per track update function
;------------------------------------------------------------------------------------
InitialUpdate:
; note this looks like it's just TRACK0
; but the macro's use
; ARG,x
updateV0
PeekCommand TRACK0
tay
; is it a command ?
and #$80
; no just go play the note
beq _playnote
; it is
tya
stx TempX
; <<1 to get word index
and #$f
asl
tax
; copy function pointers
lda PlayerFunctions,x
sta JmpFunc
lda PlayerFunctions+1,x
sta JmpFunc+1
; jump over
ldx TempX
jmp (JmpFunc)
_playnote
PeekCommand TRACK0
tay
; Set Frequency based on NOTE ID
lda FrequencyLo,y
sta $d400,x
lda FrequencyHi,y
sta $d401,x
; clear gate ?
lda #$00
sta $d404,x
; Set Instrument ADSR and Control values
lda TRACK0.Instrument,x
tay
lda AttackDelayTable,y
sta $d405,x
lda ControlTable,y
sta $d404,x
SkipNote
; no note is played from here on out
lda TRACK0.Instrument,x
tay
; reset the Clock
lda DurationTable,y
sta TRACK0.Clock,x
NextCommand TRACK0
rts
;------------------------------------------------------------------------------------
; This is the PAL table
;------------------------------------------------------------------------------------
FrequencyHi:
; C C# D D# E F F# G G# A A# B
.byte $01,$01,$01,$01,$01,$01,$01,$01,$01,$01,$01,$02 ; 1
.byte $02,$02,$02,$02,$02,$02,$03,$03,$03,$03,$03,$04 ; 2
.byte $04,$04,$04,$05,$05,$05,$06,$06,$06,$07,$07,$08 ; 3
.byte $08,$09,$09,$0a,$0a,$0b,$0c,$0d,$0d,$0e,$0f,$10 ; 4
.byte $11,$12,$13,$14,$15,$17,$18,$1a,$1b,$1d,$1f,$20 ; 5
.byte $22,$24,$27,$29,$2b,$2e,$31,$34,$37,$3a,$3e,$41 ; 6
FrequencyLo:
; C C# D D# E F F# G G# A A# B
.byte $17,$27,$39,$4b,$5f,$74,$8a,$a1,$ba,$d4,$f0,$0e ; 1
.byte $2d,$4e,$71,$96,$be,$e8,$14,$43,$74,$a9,$e1,$1c ; 2
.byte $5a,$9c,$e2,$2d,$7c,$cf,$28,$85,$e8,$52,$c1,$37 ; 3
.byte $b4,$39,$c5,$5a,$f7,$9e,$4f,$0a,$d1,$a3,$82,$6e ; 4
.byte $68,$71,$8a,$b3,$ee,$3c,$9e,$15,$a2,$46,$04,$dc ; 5
.byte $d0,$e2,$14,$67,$dd,$79,$3c,$29,$44,$8d,$08,$b8 ; 6
;------------------------------------------------------------------------------------