You can use glReadPixels() or setup a special texture to read back the
contents of the backbuffer to local memory. There is/was Apple sample
code that used glReadPixels(), but I don't think it made a QT movie.
There is a technote about setting up the texturing using client storage
from last December I believe.
The code I work on uses a QT Graphics Exporter to write out an image
sequence, and the result can be made into a .mov file in QT Player Pro.
One thing I have yet to work out is resolving the flipped Y
coordinates between GL and QT. right now, I flip pixels manually using
a line by line memcpy(), but of course that is not all that efficient.
I haven't checked into whether CoreVideo has read-back functionality to
do this or not.
On May 13, 2005, at 8:19 AM, Bob Estes wrote:
I'm wondering if there is a reasonably easy way (i.e., that doesn't
require learning and integrating a bunch of Carbon routines into my
Cocoa code) to programmatically make a Quicktime movie from my
existing code for an animation that displays in an NSOpenGLView. If
there is, I haven't been able to find it, but it seems there should
be. Any pointers would be greatly appreciated.
Bob Estes
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