Apple-2gs-SW/iigs-game-engine
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Add external entry point to the erase function

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This commit is contained in:
Lucas Scharenbroich 2021-10-28 22:18:33 -05:00
parent 7ec1b8bc29
commit 0a7d9e15c7
1 changed files with 14 additions and 7 deletions
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21
src/Sprite.s
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@ -46,9 +46,16 @@ _RenderSprites
; from. ; from.
:render :render
stx tmp0 ; stash the X register stx tmp0 ; stash the X register
; jsr _EraseSprite ; erase from the old position
ldx tmp0 txy
ldx _Sprites+OLD_VBUFF_ADDR,y
jsr _EraseTileSprite ; erase from the old position
ldx _Sprites+VBUFF_ADDR,y
lda _Sprites+TILE_DATA_OFFSET,y
tay
jsr _DrawTileSprite ; draw the sprite into the sprite plane jsr _DrawTileSprite ; draw the sprite into the sprite plane
ldx tmp0
ldy #0 ; flags to mark if the sprite is aligned to the code field grid or not ldy #0 ; flags to mark if the sprite is aligned to the code field grid or not
@ -334,14 +341,14 @@ _DrawTileSprite
; Erase is easy -- set an 8x8 area of the data region to all $0000 and the corresponding mask ; Erase is easy -- set an 8x8 area of the data region to all $0000 and the corresponding mask
; resgion to all $FFFF ; resgion to all $FFFF
; ;
; A = sprite ID ; X = address is sprite plane -- erases an 8x8 region
SPRITE_PLANE_SPAN equ 256 SPRITE_PLANE_SPAN equ 256
_EraseSprite EraseTileSprite ENT
asl jsr _EraseTileSprite
tay rtl
ldx _Sprites+OLD_VBUFF_ADDR,y
_EraseTileSprite
phb ; Save the bank to switch to the sprite plane phb ; Save the bank to switch to the sprite plane
pea #^spritedata pea #^spritedata