8bitworkshop/presets/vcs/ecs/versatile.ecs

component VersatilePlayfield
  data: array of 0..255 baseoffset -1
end

system VersatilePlayfield
    locals 2
    on preframe do with [VersatilePlayfield]
---
    lda {{<data}}
    sta {{$0}}
    lda {{>data}}
    sta {{$1}}
---
    on scanline do once
---
.if {{arg 0}} = 0
    lda ({{local 0}}),y
    tax
.endif
---
    on scanline do once
---
.if {{arg 0}} = 1
    lda ({{local 0}}),y
    sta $00,x
.endif
---
    on postframe do once
---
    lda #0
    sta PF0
    sta PF1
    sta PF2
---
  on checkplatform do with [HasXpos,HasYpos]
  ---
  lda {{<xpos}}
  clc
  adc #6
  lsr
  lsr
  tay
  lda {{^PFCollideMask}},y
  pha
  lda {{^PFCollideReg}},y
  pha
  lda #176	; TODO: adjust for kernel size
  sec
  sbc {{<ypos}}
  and #$fe
  tay
  ; TODO: use system local pointer
  pla
  cmp ({{$0}}),y	; match register?
  bne @nostop1
  dey
  pla
  and ({{$0}}),y	; mask bitmap?
  beq @nostop
  {{!platformstopped}}
  jmp @done
@nostop1:
  pla
@nostop:
  {{!platformnotstopped}}
@done:
  ---
end