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iigs-game-engine
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Clear sprite flag when erasing sprite

This commit is contained in:
Lucas Scharenbroich 2021-11-11 22:22:10 -06:00
parent dec9a3d106
commit 673b97419a
1 changed files with 50 additions and 21 deletions
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71
src/Sprite.s
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@ -80,46 +80,75 @@ _RenderSprites
txy ; switch to the Y register
; Run through the list of tile store offsets that this sprite was last drawn into and mark
; those tiles as dirty. The largest number tiles that a sprite could possibly cover is 20
; those tiles as dirty. The largest number of tiles that a sprite could possibly cover is 20
; (an unaligned 4x3 sprite), covering a 5x4 area of play field tiles.
;
; For now, we limit ourselves to 4 tiles until things are working....
;
; There is only one sprite, so clear the TS_SPRITE_FLAG field, too
lda _Sprites+TILE_STORE_ADDR_1,y
ldx _Sprites+TILE_STORE_ADDR_1,y
beq :erase_done
jsr _PushDirtyTile
lda _Sprites+TILE_STORE_ADDR_2,y
stz TileStore+TS_SPRITE_FLAG,x
jsr _PushDirtyTileX
ldx _Sprites+TILE_STORE_ADDR_2,y
beq :erase_done
jsr _PushDirtyTile
lda _Sprites+TILE_STORE_ADDR_3,y
stz TileStore+TS_SPRITE_FLAG,x
jsr _PushDirtyTileX
ldx _Sprites+TILE_STORE_ADDR_3,y
beq :erase_done
jsr _PushDirtyTile
lda _Sprites+TILE_STORE_ADDR_4,y
stz TileStore+TS_SPRITE_FLAG,x
jsr _PushDirtyTileX
ldx _Sprites+TILE_STORE_ADDR_4,y
beq :erase_done
jsr _PushDirtyTile
lda _Sprites+TILE_STORE_ADDR_5,y
stz TileStore+TS_SPRITE_FLAG,x
stz TileStore+TS_SPRITE_FLAG,x
jsr _PushDirtyTileX
ldx _Sprites+TILE_STORE_ADDR_5,y
beq :erase_done
jsr _PushDirtyTile
lda _Sprites+TILE_STORE_ADDR_6,y
stz TileStore+TS_SPRITE_FLAG,x
jsr _PushDirtyTileX
ldx _Sprites+TILE_STORE_ADDR_6,y
beq :erase_done
jsr _PushDirtyTile
lda _Sprites+TILE_STORE_ADDR_7,y
stz TileStore+TS_SPRITE_FLAG,x
jsr _PushDirtyTileX
ldx _Sprites+TILE_STORE_ADDR_7,y
beq :erase_done
jsr _PushDirtyTile
lda _Sprites+TILE_STORE_ADDR_8,y
stz TileStore+TS_SPRITE_FLAG,x
jsr _PushDirtyTileX
ldx _Sprites+TILE_STORE_ADDR_8,y
beq :erase_done
jsr _PushDirtyTile
lda _Sprites+TILE_STORE_ADDR_9,y
stz TileStore+TS_SPRITE_FLAG,x
jsr _PushDirtyTileX
ldx _Sprites+TILE_STORE_ADDR_9,y
beq :erase_done
jsr _PushDirtyTile
stz TileStore+TS_SPRITE_FLAG,x
jsr _PushDirtyTileX
:erase_done
; Really, we should only be erasing and redrawing a sprite if its local coordinates change. Look into this
; as a future optimization. Ideally, all of the sprites will be rendered into the sprite plane in a separate
; pass from this function, which is primarily concerned with flagging dirty tiles in the Tile Store.
ldx _Sprites+OLD_VBUFF_ADDR,y
; jsr _EraseTileSprite ; erase from the old position
ldx _Sprites+OLD_VBUFF_ADDR,y
beq :noerase
jsr _EraseTileSprite ; erase from the old position
inx
inx
inx
inx
jsr _EraseTileSprite
txa
clc
adc #8*256
tax
jsr _EraseTileSprite
dex
dex
dex
dex
jsr _EraseTileSprite
:noerase
; Draw the sprite into the sprint plane buffer(s)