Richard Gallery (gallery++at++prl.philips.co.uk)
Thu, 27 Apr 1995 09:02:38 +0100
What I have done to render offscreen is not exactly off-screen,
but is a lot faster than ignoring the hardware assist like
the email from Tran Thai suggested Performer 2.0 might support.
Basically, within a Performer draw callback, I use lrectread
to get the contents of the framebuffer area being used by the
current gl window, and save that to a file. Having done it,
I can't say it was difficult, but
it seemed to be a lot of work to do something that seemed like
an obvious task (basically saying, wouldn't it be nice to have
soime of those animations I've done through Performer on a video
tape, or accessed digitally so I could do a bit of image processing
on them). Of course you still get the pictures rendered to the
screen as well, which is not a problem for me, and it's not
real time (unless you have a very small window), but is a reasonable
fraction of it.
Anyway, I've always (rather naively perhaps) assumed that this
would be supplied as an option through the Performer API
eventually. Could someone clear up exactly what will be available
through Performer 2.0 in this respect.
Thanks
Richard
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