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iigs-game-engine
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Add an extra column when coordinates are not tile-aligned

This commit is contained in:
Lucas Scharenbroich 2021-08-07 21:21:28 -05:00
parent 8ed851cb33
commit 8d31720e1c
1 changed files with 11 additions and 1 deletions
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12
src/TileMap.s
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@ -94,12 +94,19 @@ _UpdateBG0TileMap
stz :Left ; prepare to do the entire screen
lda ScreenTileWidth ; and then whack off the parts
sta :Right ; that are not needed
lda StartX
and #$0003 ; If not tile-aligned, then we need to draw one extra column
beq *+2
inc :Right
stz :Top
lda ScreenTileHeight
sta :Bottom
and #$0007
beq *+2
inc :Bottom
; If we are supposed to refresh the while field, just do that and return
; If we are supposed to refresh the whole field, just do that and return
lda :Refresh
beq :NoRefresh
jmp :DrawRectBG0 ; Let the DrawRectBG0 RTS take care of the return for us
@ -371,3 +378,6 @@ _UpdateBG0TileMap