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Fix fast-path return value in PushDirtyTile and correct handling of TS_SPRITE_FLAG

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This commit is contained in:
Lucas Scharenbroich 2021-11-11 22:10:54 -06:00
parent 678c9a0563
commit dec9a3d106
1 changed files with 8 additions and 5 deletions
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13
src/blitter/Tiles.s
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@ -111,10 +111,10 @@ RenderTile ENT
_RenderTile2
lda TileStore+TS_TILE_ID,y ; build the finalized tile descriptor
ora TileStore+TS_SPRITE_FLAG,y
bpl :nosprite ; save a few cycles on average -- the sprite flag is $8000, so easy bpl/bmi test
tyx
stz TileStore+TS_SPRITE_FLAG,x ; clear the sprite flag
ldx TileStore+TS_SPRITE_FLAG,y ; This is a bitfield of all the sprites that intersect this tile, only care if non-zero or not
beq :nosprite
ora #TILE_SPRITE_BIT
ldx TileStore+TS_SPRITE_ADDR,y
stx _SPR_X_REG
@ -691,8 +691,11 @@ _PushDirtyTileX
inx
inx
stx DirtyTileCount
:occupied2
rts
:occupied2
txa ; Make sure TileStore offset is returned in the accumulator
rts
; Remove a dirty tile from the list and return it in state ready to be rendered. It is important
; that the core rendering functions *only* use _PopDirtyTile to get a list of tiles to update,
; because this routine merges the tile IDs stored in the Tile Store with the Sprite