Re: Animation and Scanlines

[toddpw@cco.caltech.edu (Todd P. Whitesel)]

chuckie@sage.cc.purdue.edu (Gunn, C Stephen) writes:

>Please note that for people who have Video Overlay Cards.. this function will
>NOT work.. The VOC has its own circuitry for the video display, and unless
>the card is synched to the internal video, anything based on scan lines wont
>work. Don't take this as a "DONT DO THIS" Its just something you should be
>aware of. I've learned to live with it when I have my VOC hooked up.

The VOC video counters are unavailable, but the VBL bit and IRQ and scan line
IRQ's are available if you know where to look for them. There are tool
interfaces that are (of course) hideously slow just to provide a hardware
independent interface, and Apple has not done the sensible thing (i.e. allowing
you to do something like GetVector for a low-level interface like the sound
tools).

Todd Whitesel
toddpw @ cco.caltech.edu