.scope Main
.zeropage
HasBitmap_bitmap_b0:
.res 1
.res 1
.res 1
.res 1
HasColormap_colormap_b0:
.res 1
.res 1
.res 1
.res 1
HasXpos_xpos_b0:
.res 1
.res 1
.res 1
.res 1
HasYpos_ypos_b0:
.res 1
.res 1
.res 1
.res 1
SpriteSlot_sprite_b0:
.res 1
.res 1
.res 1
.res 1
TEMP:
Kernel2Sprite__2__tmp:
Joystick__3__tmp:
.res 1
SpriteShuffler__8__tmp:
.res 1
.res 1
SpriteHider__9__tmp:
.res 1
.res 1
.res 1
.res 1
.res 1
.res 1
.res 1
.res 1
.res 1
.res 1
.code
KernelSection_lines_b0:
.byte 192
BGColor_bgcolor_b0:
.byte 162
Bitmap_bitmapdata_b0:
.byte <(Bitmap_bitmapdata_e1_b0+31)
.byte <(Bitmap_bitmapdata_e2_b0+31)
Bitmap_bitmapdata_b8:
.byte >(Bitmap_bitmapdata_e1_b0+31)
.byte >(Bitmap_bitmapdata_e2_b0+31)
Bitmap_bitmapdata_e1_b0:
.byte 1
.byte 1
.byte 3
.byte 7
.byte 15
.byte 31
.byte 63
.byte 127
Bitmap_height_b0:
.byte 8
.byte 8
Bitmap_bitmapdata_e2_b0:
.byte 24
.byte 62
.byte 255
.byte 255
.byte 255
.byte 255
.byte 62
.byte 24
Colormap_colormapdata_b0:
.byte <(Colormap_colormapdata_e3_b0+31)
Colormap_colormapdata_b8:
.byte >(Colormap_colormapdata_e3_b0+31)
Colormap_colormapdata_e3_b0:
.byte 6
.byte 3
.byte 6
.byte 9
.byte 12
.byte 14
.byte 31
.byte 63
Sprite_plyrflags_b0:
.byte 0
.byte 3
.byte 2
.byte 0
Main__INITDATA:
.byte 1
.byte 0
.byte 1
.byte 0
.byte 0
.byte 0
.byte 0
.byte 0
.byte 50
.byte 100
.byte 80
.byte 40
.byte 150
.byte 60
.byte 90
.byte 150
.byte 0
.byte 1
.byte 2
.byte 3
__Start:
.code

;;; start action Init 10 main_init

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

    ldy #20
:   lda Main__INITDATA-1,y
    sta HasBitmap_bitmap_b0-1,y
    dey
    bne :-
	; initialize data segment
.code

;;; start action FrameLoop 1 start

FrameLoop__start__2__NextFrame:
    FRAME_START
    .code

;;; start action Kernel2Sprite 2 preframe

.define KLINES #192
.define KPAD 32
; set height to zero in case no sprites
    lda #0
    sta Kernel2Sprite__2__tmp+8
    sta Kernel2Sprite__2__tmp+9
; set temp value so we don't read bitmap from h/w registers
    lda #$F0
    sta Kernel2Sprite__2__tmp+2
    sta Kernel2Sprite__2__tmp+3
    sta Kernel2Sprite__2__tmp+6
    sta Kernel2Sprite__2__tmp+7

;;; end action Kernel2Sprite 2 preframe

;;; start action Kernel2Sprite 2 preframe

    ldy #0
Kernel2Sprite__preframe__4____each:
    ldx SpriteSlot_sprite_b0,y
    
; flags set according to sprite slot value
; skip sprite if negative
    jmi Kernel2Sprite__preframe__4__nosprite
; set player object flags
    lda Sprite_plyrflags_b0,x
    sta NUSIZ0,y
    sta REFP0,y
; calculate screen height - ypos
    lda KLINES+KPAD
    sec
    sbc HasYpos_ypos_b0,x
    sta Kernel2Sprite__2__tmp+11
; calculate bitmap pointer
    stx Kernel2Sprite__2__tmp+12		; save X (Sprite index)
    lda HasBitmap_bitmap_b0,x     ; deref bitmap
    tax
    lda Bitmap_bitmapdata_b0,x
    sec
    sbc Kernel2Sprite__2__tmp+11
    sta Kernel2Sprite__2__tmp+0,y	; Y = sprite slot index
    lda Bitmap_bitmapdata_b8,x
    sbc #0
    sta Kernel2Sprite__2__tmp+2,y
; get bitmap height
    lda Bitmap_height_b0,x
    sta Kernel2Sprite__2__tmp+8,y
; calculate colormap pointer
    ldx Kernel2Sprite__2__tmp+12		; restore X
    lda HasColormap_colormap_b0,x	; deref colormap
    tax
    lda Colormap_colormapdata_b0,x
    sec
    sbc Kernel2Sprite__2__tmp+11
    sta Kernel2Sprite__2__tmp+4,y
    lda Colormap_colormapdata_b8,x
    sbc #0
    sta Kernel2Sprite__2__tmp+6,y
; save ypos
    ldx Kernel2Sprite__2__tmp+12		; restore X
    lda HasYpos_ypos_b0,x
    sta Kernel2Sprite__2__tmp+10,y
Kernel2Sprite__preframe__4__nosprite:

    iny
    cpy #2
    jne Kernel2Sprite__preframe__4____each
Kernel2Sprite__preframe__4____exit:

;;; end action Kernel2Sprite 2 preframe

;;; start action Kernel2Sprite 2 preframe

; shuffle pointers into (MSB, LSB) byte order
; L0 L1 H0 H1 -> L0 H0 L1 H1
    lda Kernel2Sprite__2__tmp+1
    ldy Kernel2Sprite__2__tmp+2
    sty Kernel2Sprite__2__tmp+1
    sta Kernel2Sprite__2__tmp+2
    lda Kernel2Sprite__2__tmp+5
    ldy Kernel2Sprite__2__tmp+6
    sty Kernel2Sprite__2__tmp+5
    sta Kernel2Sprite__2__tmp+6

;;; end action Kernel2Sprite 2 preframe

;;; start action Kernel2Sprite 2 preframe

    lda #162
    sta COLUBK

;;; end action Kernel2Sprite 2 preframe

;;; start action Kernel2Sprite 2 preframe

;;; end action Kernel2Sprite 2 preframe

;;; start action SetXPos 6 preframe

    sta HMCLR

;;; end action SetXPos 6 preframe

;;; start action SetXPos 6 preframe

    ldy #0
SetXPos__preframe__9____each:
    ldx SpriteSlot_sprite_b0,y
    
    lda HasXpos_xpos_b0,x
    .code

;;; start action SetHorizPos 7 SetHorizPos

; SetHorizPos routine
; A = X coordinate
; Y = player number (0 or 1)
    sta WSYNC	; start a new line
    sec		    ; set carry flag
    nop
SetHorizPos__SetHorizPos__10__DivideLoop:
    sbc #15		; subtract 15
    bcs SetHorizPos__SetHorizPos__10__DivideLoop	; branch until negative
    eor #7		; calculate fine offset
    asl
    asl
    asl
    asl
    sta RESP0,y	; fix coarse position
    sta HMP0,y	; set fine offset

;;; end action SetHorizPos 7 SetHorizPos


    iny
    cpy #2
    jne SetXPos__preframe__9____each
SetXPos__preframe__9____exit:

;;; end action SetXPos 6 preframe

;;; start action SetXPos 6 preframe

;;; end action SetXPos 6 preframe

;;; start action SetXPos 6 preframe

    sta WSYNC
    sta HMOVE

;;; end action SetXPos 6 preframe

    KERNEL_START
    .code

;;; start action Kernel2Sprite 2 kernel

    ldy #0
    sty VDELP0
    iny
    sta VDELP1

;;; end action Kernel2Sprite 2 kernel

;;; start action Kernel2Sprite 2 kernel
    
    ldy #192
Kernel2Sprite__kernel__14__LVScan:
    .code

;;; start action Kernel2Sprite 2 scanline

; draw player 0
    lda Kernel2Sprite__2__tmp+8 ; height
    dcp Kernel2Sprite__2__tmp+10 ; ypos
    bcs Kernel2Sprite__scanline__15__DoDraw1
    lda #0
    .byte $2C
Kernel2Sprite__scanline__15__DoDraw1:
    lda (Kernel2Sprite__2__tmp+0),y
    .if 0 = 0
    sta WSYNC
    .endif
    sta GRP0
    lda (Kernel2Sprite__2__tmp+4),y
    sta COLUP0
; draw player 1
    lda Kernel2Sprite__2__tmp+9 ; height
    dcp Kernel2Sprite__2__tmp+11 ; ypos
    bcs Kernel2Sprite__scanline__15__DoDraw2
    lda #0
    .byte $2C
Kernel2Sprite__scanline__15__DoDraw2:
    lda (Kernel2Sprite__2__tmp+2),y
    sta GRP1
    lda (Kernel2Sprite__2__tmp+6),y
    sta COLUP1

;;; end action Kernel2Sprite 2 scanline

;;; start action Kernel2Sprite 2 scanline

;;; end action Kernel2Sprite 2 scanline

    dey		; next scanline
    .code

;;; start action Kernel2Sprite 2 scanline

; draw player 0
    lda Kernel2Sprite__2__tmp+8 ; height
    dcp Kernel2Sprite__2__tmp+10 ; ypos
    bcs Kernel2Sprite__scanline__17__DoDraw1
    lda #0
    .byte $2C
Kernel2Sprite__scanline__17__DoDraw1:
    lda (Kernel2Sprite__2__tmp+0),y
    .if 1 = 0
    sta WSYNC
    .endif
    sta GRP0
    lda (Kernel2Sprite__2__tmp+4),y
    sta COLUP0
; draw player 1
    lda Kernel2Sprite__2__tmp+9 ; height
    dcp Kernel2Sprite__2__tmp+11 ; ypos
    bcs Kernel2Sprite__scanline__17__DoDraw2
    lda #0
    .byte $2C
Kernel2Sprite__scanline__17__DoDraw2:
    lda (Kernel2Sprite__2__tmp+2),y
    sta GRP1
    lda (Kernel2Sprite__2__tmp+6),y
    sta COLUP1

;;; end action Kernel2Sprite 2 scanline

;;; start action Kernel2Sprite 2 scanline

;;; end action Kernel2Sprite 2 scanline

    dey		; next scanline
    bne Kernel2Sprite__kernel__14__LVScan	; repeat until out of lines

;;; end action Kernel2Sprite 2 kernel

;;; start action Kernel2Sprite 2 kernel

    lda #0
    sta GRP0
    sta GRP1
    sta GRP0
    sta GRP1

;;; end action Kernel2Sprite 2 kernel

    KERNEL_END
    .code

;;; start action Joystick 3 postframe

; 2 control inputs share a single byte, 4 bits each
    lda SWCHA
    sta Joystick__3__tmp+0

;;; end action Joystick 3 postframe

;;; start action Joystick 3 postframe

    ldx #0
Joystick__postframe__21____each:
    
    asl Joystick__3__tmp+0
    bcs Joystick__postframe__21__SkipMoveRight
    .code

;;; start action MoveJoyX 4 joyright

    lda HasXpos_xpos_b0,x
    clc
    adc #1
    cmp #152
    bcs MoveJoyX__joyright__22__nomove
    sta HasXpos_xpos_b0,x
MoveJoyX__joyright__22__nomove:

;;; end action MoveJoyX 4 joyright

Joystick__postframe__21__SkipMoveRight:
    asl Joystick__3__tmp+0
    bcs Joystick__postframe__21__SkipMoveLeft
    .code

;;; start action MoveJoyX 4 joyleft

    lda HasXpos_xpos_b0,x
    sec
    sbc #1	
    bcc MoveJoyX__joyleft__23__nomove
    sta HasXpos_xpos_b0,x
MoveJoyX__joyleft__23__nomove:

;;; end action MoveJoyX 4 joyleft

Joystick__postframe__21__SkipMoveLeft:
    asl Joystick__3__tmp+0
    bcs Joystick__postframe__21__SkipMoveDown
    .code

;;; start action MoveJoyY 5 joydown

    lda HasYpos_ypos_b0,x
    clc
    adc #1
    cmp #220
    bcs MoveJoyY__joydown__24__nomove
    sta HasYpos_ypos_b0,x
MoveJoyY__joydown__24__nomove:

;;; end action MoveJoyY 5 joydown

Joystick__postframe__21__SkipMoveDown:
    asl Joystick__3__tmp+0
    bcs Joystick__postframe__21__SkipMoveUp
    .code

;;; start action MoveJoyY 5 joyup

    lda HasYpos_ypos_b0,x
    sec
    sbc #1
    bcc MoveJoyY__joyup__25__nomove
    sta HasYpos_ypos_b0,x
MoveJoyY__joyup__25__nomove:

;;; end action MoveJoyY 5 joyup

Joystick__postframe__21__SkipMoveUp:

    inx
    cpx #4
    jne Joystick__postframe__21____each
Joystick__postframe__21____exit:

;;; end action Joystick 3 postframe

;;; start action SpriteShuffler 8 postframe

; load two sprite slots at left side of array
	lda SpriteSlot_sprite_b0
        sta SpriteShuffler__8__tmp+0
	lda SpriteSlot_sprite_b0+1
        sta SpriteShuffler__8__tmp+1
; move two slots to the left
        ldx #0
SpriteShuffler__postframe__26__loop:
	lda SpriteSlot_sprite_b0+2,x
	sta SpriteSlot_sprite_b0,x
	inx
        cpx #4-2
        bne SpriteShuffler__postframe__26__loop
; store two sprite slots at right side of array
        lda SpriteShuffler__8__tmp+0
	sta SpriteSlot_sprite_b0+4-2
        lda SpriteShuffler__8__tmp+1
	sta SpriteSlot_sprite_b0+4-1

;;; end action SpriteShuffler 8 postframe

;;; start action SpriteHider 9 postframe

	lda #4-1
        sta SpriteHider__9__tmp+0

;;; end action SpriteHider 9 postframe

;;; start action SpriteHider 9 postframe

    ldy #0
SpriteHider__postframe__28____each:
    ldx SpriteSlot_sprite_b0,y
    
	lda HasYpos_ypos_b0,x
        cmp #192
        bcc SpriteHider__postframe__28__skip
; swap this sprite slot with slot at end of array
	lda SpriteSlot_sprite_b0,y
        pha
        ldx SpriteHider__9__tmp+0	; clobbers X, but no longer used
	lda SpriteSlot_sprite_b0,x
	sta SpriteSlot_sprite_b0,y
        pla
	sta SpriteSlot_sprite_b0,x
        dec SpriteHider__9__tmp+0
SpriteHider__postframe__28__skip:

    iny
    cpy #2
    jne SpriteHider__postframe__28____each
SpriteHider__postframe__28____exit:

;;; end action SpriteHider 9 postframe

    FRAME_END
    .code

    jmp FrameLoop__start__2__NextFrame    ; loop to next frame

;;; end action FrameLoop 1 start
	; start main routine
.segment "VECTORS"
Return:    .word $6060
VecNMI:
VecReset:  .word Main::__Reset
VecBRK:    .word Main::__BRK

;;; end action Init 10 main_init

.endscope
Main__Start = Main::__Start