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Atari coding BBS
| Lower Border Problem Sorted |
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Posted by: Bod/STAX
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Jun,04.2012-10:41
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Last night I thought I have a damn good go at fixing this, what I would call 'trivial bug' border problem in my game.
It seems the only way I could stop the border from flickering is to do things the following way:
Set an interrrupt using the method in Evil's source code to set the status display palette, change video counter etc. (this interrupt is stable) but before doing anything do a 'ST BLIT_FLAG' and don't switch the blitter on at the end of the interrupt. I then set a second interrupt to remove the lower border (again using Evil's method) and then after the 60/50 switch do an 'SF BLIT_FLAG' and turn the blitter back on.
The 'BLIT_WAIT" loop now looks like this:
LOOP: TST.B BLIT_WAIT
BNE.S LOOP
TAS.B $FFFFF8A3C.W
BMI.S LOOP
Doing things this way means I loose 8 scanlines if the blitter is in operation during the interrupt but I loose 0 scanlines if software routines are being used. Swings and roundabouts I suppose - I'll just have to put up with losing those scanlines during blitter operations, but at least I get a stable border routine. :)
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