If I understand you fully....
P0 and P1 could only collide ONCE per TV frame. In
other words, if P0 and P1 are to collide on scanline 4
and 104, it would occurr in two different frames. So
you could put your code to check the collision latches
in VBLANK. And in your situation, you'd see the
collision TWO different times in VBLANK.
--- "John K. Harvey" <jkharvey@xxxxxxxxxxxxxxxxx>
wrote:
> Ok, so I've been thinking about collision detections
> (pretty obvious, if
> you read the subject line).
>
> I've never done these things before, and was
> wondering when to check, set,
> and clear the latches. The stella guide says I
> should do it typically in
> VBLANK. However:
> Hypothetically, I've been thinking of a situation:
> P0 and P1 collide on scanline 4.
> P0 and P1 collide on scanline 104.
>
> Should I check for collisions after scanline 4, and
> then rewrite to CXCLR
> immediately afterward, and check for another
> collision after liune 104, or
> just try to figure the stuff out all in VBLANK? I
> guess I'm just wondering
> what works bet for some of you others who have used
> this stuff.
>
> And also, are collisions only detected in the
> kernal?
>
> Thanks!
>
> -John K. Harvey
> "The man who didn't care about his igneous rock
> took it for granite."
>
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