I now have succeeded in obtaining a CGLPBufferObj which wraps a pbuffer
with my desired image.
(I reasonably confident in this, as I have used this CGLPBufferObj to
create a temporary texture so that I can render it to the screen)
I would like a copy of this CGLPBufferObj as a pixmap in system memory.
glReadPixels() promises to do just this and according to:
<snip>
It is also legal to use OpenGL functions such as glReadPixels to read
the contents of a Pbuffer directly via the Pbuffer context.
</snip>
Exactly how do I do this? What is a Pbuffer context? as opposed to the
CGLContextObj?
Assuming I have a:
CGLSetCurrentContext( glContextObj );
Should it not be a simple as:
glReadBuffer(GL_FRONT);
glReadPixels(...);
Any ideas what I may have missed (I'm not getting any data from
glReadPixels )
Thanks again,
Simon.
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