EVENT__start = 1
EVENT__postframe = 1
EVENT__preframe = 1
EVENT__prekernel = 1
EVENT__postkernel = 1
EVENT__musicframe = 1
EVENT__musicpulse = 1
EVENT__musicnote = 1
EVENT__playmusic = 1
EVENT__stopmusic = 1
EVENT__musicdone = 1
EVENT__preframeloop = 1
.scope music
.zeropage
MusicPlayer_timer_b0:
.res 1
MusicChannel_duration_b0:
.res 1
.res 1
MusicChannel_note_b0:
.res 1
.res 1
MusicChannel_duty_b0:
.res 1
.res 1
MusicPlayer_channel_b0:
.res 1
MusicPlayer_songptr_b0:
.res 1
MusicPlayer_songptr_b8:
.res 1
.code
MusicPlayer_volume_b0:
.byte 10
MusicPlayer_tempo_b0:
.byte 31
music__INITDATA:
.byte 255
.byte 0
.byte 0
.byte 0
.byte 0
.byte 0
.byte 0
.byte 0
.byte 0
.byte 0
__Start:

;;; start action Init__main_init__1

.include "vcs-ca65.h"
.macpack longbranch
.define PAL 0
.segment "STARTUP"
__NMI:
__Reset:
__BRK:
    CLEAN_START

    ldy #10
:   lda music__INITDATA-1,y
    sta MusicPlayer_timer_b0-1,y
    dey
    bne :-

;;; start action FrameLoop__start__3

    
;;; start action music__preframeloop__5

    
;;; start action music__musicdone__7

    ; TODO: nested exprs
    ; 
 jsr MusicPlayer__playmusic__10

    ;SampleMusic
    
 jsr MusicPlayer__playmusic__13

    
;;; end action music__musicdone__7

    
;;; end action music__preframeloop__5

FrameLoop__start__4__NextFrame:
    FRAME_END
    
    FRAME_START
    
;;; start action MusicPlayer__preframe__16

  
;;; start action MusicPlayer__musicpulse__18

    ldx #0
MusicPlayer__musicpulse__19____each:
    
; Decrement the volumes for each channel
; Also decrement next-note timer, fetch next note
	lda	MusicChannel_duration_b0,x
        beq	:+
        lsr
        sta	AUDV0,x
        dec	MusicChannel_duration_b0,x
:

    inx
    cpx #2
    jne MusicPlayer__musicpulse__19____each
MusicPlayer__musicpulse__19____exit:

;;; end action MusicPlayer__musicpulse__18

;;; start action MusicPlayer__musicpulse__21

        lda	MusicPlayer_timer_b0
        bmi	MusicPlayer__musicpulse__23__Done
        beq	MusicPlayer__musicpulse__23__NextData
        dec	MusicPlayer_timer_b0
        jmp	MusicPlayer__musicpulse__23__Done
; Timer ran out, so fetch next note
MusicPlayer__musicpulse__23__NextData:
	ldx	#0
        lda	(MusicPlayer_songptr_b0,x)
        bmi	MusicPlayer__musicpulse__23__LoadDuration
; < $80, play next note
        ldx	MusicPlayer_channel_b0	; next channel
        tay
        
;;; start action MusicPlayer__musicnote__24

; Play a note
; X = channel (0,1)
; Y = note index (0-63)
	lda	FREQZ,y
        sta	MusicChannel_note_b0,x
	lda	DUTYZ,y
        sta	MusicChannel_duty_b0,x
        lda	TONEZ,y
        sta	AUDC0,x
; TODO: consts?
        lda	MusicPlayer_tempo_b0
        sta	MusicChannel_duration_b0,x
        lda	MusicPlayer_volume_b0
        sta	AUDV0,x
  
;;; end action MusicPlayer__musicnote__24

        inx
        txa
        and	#1
        sta	MusicPlayer_channel_b0	; inc next channel
        jmp	MusicPlayer__musicpulse__23__IncDataPtr
; >= $80, load next duration
MusicPlayer__musicpulse__23__LoadDuration:
	cmp	#$ff		; $ff = end of song
        bne	MusicPlayer__musicpulse__23__NoResetTrack
        sta     MusicPlayer_timer_b0
        
;;; start action music__musicdone__27

    ; TODO: nested exprs
    ; 
 jsr MusicPlayer__playmusic__10

    ;SampleMusic
    
 jsr MusicPlayer__playmusic__13

    
;;; end action music__musicdone__27

        jmp     MusicPlayer__musicpulse__23__Done
MusicPlayer__musicpulse__23__NoResetTrack:
        and	#$7f
;        asl
        sta	MusicPlayer_timer_b0	; store duration * 2
MusicPlayer__musicpulse__23__IncDataPtr:
; increment song pointer
	inc	MusicPlayer_songptr_b0
        bne	MusicPlayer__musicpulse__23__Done
	inc	MusicPlayer_songptr_b8
MusicPlayer__musicpulse__23__Done:
  
;;; end action MusicPlayer__musicpulse__21
	; update song
  
 jsr MusicPlayer__musicframe__36
	; update registers
  
;;; end action MusicPlayer__preframe__16

    
;;; start action MusicPlayer__prekernel__39

  
 jsr MusicPlayer__musicframe__36
	; update registers
  
;;; end action MusicPlayer__prekernel__39

    KERNEL_START
    
    KERNEL_END
    
;;; start action MusicPlayer__postkernel__44

  
 jsr MusicPlayer__musicframe__36
	; update registers
  
;;; end action MusicPlayer__postkernel__44

    
;;; start action FrameLoop__postframe__49

    lsr SWCHB	      ; test Game Reset switch
    bcs FrameLoop__postframe__50__NoStart
    
FrameLoop__postframe__50__NoStart:

;;; end action FrameLoop__postframe__49

;;; start action MusicPlayer__postframe__51

  
 jsr MusicPlayer__musicframe__36
	; update registers
  
;;; end action MusicPlayer__postframe__51

    jmp FrameLoop__start__4__NextFrame    ; loop to next frame

;;; end action FrameLoop__start__3
	; start main routine
.segment "VECTORS"
ZeroByte:  .byte $00
Return:    .byte $60
VecNMI:
VecReset:  .word __Reset
VecBRK:    .word __BRK
.code

;;; end action Init__main_init__1
.rodata
__ALIGNORIGIN:
.rodata
MusicPlayer__playmusic__10:

  lda	#<^SampleMusic
  sta	MusicPlayer_songptr_b0
  lda	#>^SampleMusic
  sta	MusicPlayer_songptr_b8
  lda   #0
  sta   MusicPlayer_timer_b0
  
 rts
.rodata
MusicPlayer__playmusic__13:

  lda	#<SampleMusic
  sta	MusicPlayer_songptr_b0
  lda	#>SampleMusic
  sta	MusicPlayer_songptr_b8
  lda   #0
  sta   MusicPlayer_timer_b0
  
 rts
.rodata
MusicPlayer__musicframe__36:

    ldx #0
MusicPlayer__musicframe__37____each:
    
; Update channel pitch in AUDF0
; 8-bit rotation of duty cycle bits
	lda	MusicChannel_duration_b0,x
        beq	:++
	lda	MusicChannel_duty_b0,x
        asl
        bcc	:+
        ora	#1
:	sta	MusicChannel_duty_b0,x
	lda	MusicChannel_note_b0,x
        beq	:+
; If next bit is set, add 1 to AUDF0 
        adc	#0
        sta	AUDF0,x
:
  
    inx
    cpx #2
    jne MusicPlayer__musicframe__37____each
MusicPlayer__musicframe__37____exit:

 rts
SampleMusic:

;;; start action SampleMusic__SampleMusic__56

 .byte $35,$41,$8a,$37,$43,$8a,$33,$3f,$8a,$30,$3c,$94,$3e,$32,$8a,$3a,$2e,$94,$35,$29,$8a,$37,$2b,$8a,$33,$27,$8a,$30,$24,$94,$32,$26,$8a,$2e,$22,$94,$29,$1d,$8a,$2b,$1f,$8a,$27,$1b,$8a,$24,$18,$94,$1a,$26,$8a,$18,$24,$8a,$17,$23,$8a,$16,$22,$a8,$3a,$35,$ff

;;; end action SampleMusic__SampleMusic__56

FREQZ:

;;; start action FREQZ__FREQZ__58

  .byte 30, 30, 30, 30, 30, 28, 26, 25, 23, 22, 21, 19, 18, 17, 16, 15, 14, 13, 12, 12, 11, 10, 10, 9, 8, 8, 7, 7, 6, 6, 5, 5, 30, 29, 27, 25, 24, 22, 21, 20, 19, 18, 16, 15, 15, 14, 13, 12, 11, 11, 10, 31, 29, 27, 25, 24, 23, 21, 20, 19, 18, 16, 15, 15

;;; end action FREQZ__FREQZ__58

DUTYZ:

;;; start action DUTYZ__DUTYZ__60

  .byte 247, 247, 247, 247, 1, 73, 219, 1, 219, 73, 0, 219, 181, 85, 85, 85, 181, 219, 247, 1, 73, 181, 0, 73, 219, 17, 219, 17, 219, 73, 247, 85, 247, 1, 85, 247, 73, 247, 181, 17, 1, 0, 247, 247, 0, 1, 17, 73, 181, 0, 17, 0, 1, 85, 247, 73, 0, 181, 73, 1, 0, 247, 247, 0

;;; end action DUTYZ__DUTYZ__60

TONEZ:

;;; start action TONEZ__TONEZ__62

  .byte 0, 0, 0, 0, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4

;;; end action TONEZ__TONEZ__62

.endscope
music__Start = music::__Start