Apple-2gs-SW/iigs-game-engine
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Enable all dirty bits to minimize per-frame, per-sprite work

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This commit is contained in:
Lucas Scharenbroich 2022-02-23 08:41:02 -06:00
parent 88fba6cd15
commit 7bde48e36c
1 changed files with 12 additions and 2 deletions
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14
src/Sprite.s
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@ -307,7 +307,7 @@ _DoPhase1
bit #SPRITE_STATUS_REMOVED
beq :out
lda #SPRITE_STATUS_EMPTY ; Mark as empty
lda #SPRITE_STATUS_EMPTY ; Mark as empty (zero value)
sta _Sprites+SPRITE_STATUS,y
lda _SpriteBits,y ; Clear from the sprite bitmap
@ -384,10 +384,15 @@ phase2 dw :phase2_0
_DoPhase2
lda _Sprites+SPRITE_STATUS,y
beq :out ; If phase 1 marked us as empty, do nothing
ora forceSpriteFlag
and #SPRITE_STATUS_ADDED+SPRITE_STATUS_MOVED+SPRITE_STATUS_UPDATED
beq :out
; Last thing to do, so go ahead and clear the flags
lda #SPRITE_STATUS_OCCUPIED
sta _Sprites+SPRITE_STATUS,y
; Mark the appropriate tiles as dirty and as occupied by a sprite so that the ApplyTiles
; subroutine will combine the sprite data with the tile data into the code field where it
; can be drawn to the screen. This routine is also responsible for setting the specific
@ -489,7 +494,8 @@ phase1_rtn
jmp (phase2,x)
phase2_rtn
; Sprite rendering complete
; Sprite rendering complete, clear the dirty bits
rts
; _GetTileAt
@ -726,6 +732,9 @@ _UpdateSpriteX
:ok
_UpdateSpriteXnc
cmp _Sprites+SPRITE_ID,x ; Don't do anything if there is no change
beq :no_sprite_change
sta _Sprites+SPRITE_ID,x ; Keep a copy of the full descriptor
jsr _GetBaseTileAddr ; This applies the TILE_ID_MASK
cmp _Sprites+TILE_DATA_OFFSET,x
@ -740,6 +749,7 @@ _UpdateSpriteXnc
ora #SPRITE_STATUS_UPDATED
sta _Sprites+SPRITE_STATUS,x
:no_sprite_change
rts
; Move a sprite to a new location. If the tile ID of the sprite needs to be changed, then