8bitworkshop/presets/vcs/ecs/sprites.ecs

//#resource "vcs-ca65.h"

import "vcslib.ecs"

component Bitmap
    bitmapdata: array of 0..255 baseoffset 31
    height: 0..255
end

// TODO: remove?
component HasBitmap
end

component Colormap
    colormapdata: array of 0..255 baseoffset 31
end

component HasColormap
    colormap: [Colormap]
end

component Sprite
    bitmap: [Bitmap]
    plyrflags: 0..63
end

component HasXpos
    xpos: 0..255
end

component HasYpos
    ypos: 0..255
end

component Missile
    index: 2..3
end

component SpriteSlot
    sprite: [Sprite] // TODO: HasBitmap?
end

system JoyFaceDirection
    on joyleft do with [Sprite]
---
    lda {{<plyrflags}}
    ora #$08
    sta {{<plyrflags}}
---
    on joyright do with [Sprite]
---
    lda {{<plyrflags}}
    and #$f7
    sta {{<plyrflags}}
---
end

system MoveJoyX
    on joyleft do with [HasXpos]
---
    lda {{<xpos}}
    sec
    sbc #1
    bcc @nomove
    sta {{<xpos}}
@nomove:
---
    on joyright do with [HasXpos]
---
    lda {{<xpos}}
    clc
    adc #1
    cmp #150
    bcs @nomove
    sta {{<xpos}}
@nomove:
---
end

system MoveJoyY
    on joyup do with [HasYpos]
---
    lda {{<ypos}}
    sec
    sbc #1
    bcc @nomove
    sta {{<ypos}}
@nomove:
---
    on joydown do with [HasYpos]
---
    lda {{<ypos}}
    clc
    adc #1
    cmp #220
    bcs @nomove
    sta {{<ypos}}
@nomove:
---
end

system SetXPos
    on preframe do join [SpriteSlot] with [Sprite]
    limit 2
---
    lda {{<xpos}}
    {{!SetHorizPos}}
---
    on preframe do foreach [Missile,HasXpos]
---
    lda {{<xpos}}
    ldy {{<index}}
    {{!SetHorizPos}}
---
    on prekernel do once
---
    sta WSYNC
    sta HMOVE
    SLEEPR 24
    sta HMCLR
---
end

system SpriteShuffler
	locals 2
	on postframe do select [SpriteSlot]
---
; load two sprite slots at left side of array
	lda {{<SpriteSlot:sprite}}
        sta {{$0}}
	lda {{<SpriteSlot:sprite}}+1
        sta {{$1}}
; move two slots to the left
        ldx #0
@loop:
	lda {{<SpriteSlot:sprite}}+2,x
	sta {{<SpriteSlot:sprite}},x
	inx
        cpx #{{%ecount}}-2
        bne @loop
; store two sprite slots at right side of array
        lda {{$0}}
	sta {{<SpriteSlot:sprite}}+{{%ecount}}-2
        lda {{$1}}
	sta {{<SpriteSlot:sprite}}+{{%ecount}}-1
---
end

system SpriteHider
	locals 1
	on postframe do select [SpriteSlot]
---
	lda #{{%efullcount}}-1
        sta {{$0}}
---
	on postframe do
        join [SpriteSlot]
        with [Sprite,HasYpos]
        limit 2
---
	lda {{<ypos}}
        cmp #192
        bcc @skip
; swap this sprite slot with slot at end of array
	lda {{<SpriteSlot:sprite}},y
        pha
        ldx {{$0}}	; clobbers X, but no longer used
	lda {{<SpriteSlot:sprite}},x
	sta {{<SpriteSlot:sprite}},y
        pla
	sta {{<SpriteSlot:sprite}},x
        dec {{$0}}
@skip:
---
end