[stella] Re: skipdraw from Eric Ball

Subject: [stella] Re: skipdraw from Eric Ball
From: "Eric Ball" <ericball@xxxxxxxxxxxx>
Date: Tue, 13 Apr 2004 19:28:32 -0400
> > Yup, the trick is to setup P0_ptr outside the kernel, so that it
> > points to your graphics exactly when the right scanlines (= y-
> > values) are reached.
> > To avoid page penalties, this also requires the graphics to start
> > at (align 256 + kernel-height).
> *ohhhhhhhh*...Eric Ball neglected to mention that little detail!
> Man, skipDraw *is* pretty complex...most of the other descriptions
> I've seen don't get into what all the preconditions (set up in the
> VBLANK) are.

I didn't know that detail myself.  I haven't used skipDraw (Skeleton+
doesn't, though it could/should), I just waded through the [stella] archives
to find out what all the fuss was about.

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