Mail Archives: djgpp/1993/07/26/11:57:25
I may have been dreaming, but I thought I saw a message go by a few
days ago that told how to detect the video retrace signal from within
djgpp --- I also thought I had saved it :-(
Part of my programming task will be very well served by the XFER.S
code so graciously posted :-), but I have a further constraint I
expect is solvable and thought I'd ask in case anyone had some really
elegant solutions: I want to draw on a stereo video signal where the
cameras are switched on the input vertical retrace. This means,
first, I need to detect the retrace so I can change the context of my
drawing (whether left or right views), and then I need to draw through
a stencil of alternating clear and opaque lines. Since I'm drawing to
horizontal line, I expect I can modify the XFER.S to skip the opaque
lines of my 'stencil' (unless there is some faster method --- I only
have a few ms to render before the next video frame arrives.
Any and all suggestions are most welcome ;-)
Gary Lawrence Murphy ---------------- garym AT virtual DOT rose DOT utoronto DOT ca
University of Toronto, Industrial Eng Dept fax: (416) 978-3453
4 Taddle Creek Rd, Toronto, Ont M5S 1A4 voice: (416) 978-3776
The true destination is always just here, now ----------------------
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