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Atari coding BBS
| Re: ST: Screen Pointer Update glit |
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Posted by: evil
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Jun,30.2017-12:16
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Do the actual hardware register write very early in vbl and swap the buffers in the main loop.
It doesn't hurt if the vbl set the same address several vbl in a row.
To do your own vbl routine isn't hard:
;init
move.l $70.w,save_vbl
move.l #myvbl,$70.w
;vblcode
myvbl:
move.l d0,-(sp)
move.l scraddr,d0
lsr.w #8,d0
move.l d0,$ffff8200.w
move.l (sp)+,d0
rte
;exit
move.l save_vbl,$70.w
However, if your main loop suddenly need less than 1 vbl in some cases, you need to wait for vbl so you don't swap around all buffers and end up on the visible one.
--
Anders Eriksson
ae@dhs.nu
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