User-agent: Mozilla Thunderbird 0.9 (Macintosh/20041103)
I would like to ping-pong between two pbuffers (for multi-pass blending
on floating point pixels), and if possible I'd like to use a single
double buffered pbuffer so that I can swap buffers instead of having to
switch contexts. I'm running into a problem with CGL. It appears that
if I do a CGLFlushDrawable it doesn't swap the buffers (the resulting
image obviously is reading and writing to the same buffer). I can
manually make things work by setting the draw buffer via glDrawBuffer,
and then calling CGLTexImagePBuffer with the same buffer the I drew into
and setting glDrawBuffer to the other buffer. ie:
glDrawBuffer( GL_BACK );
// draw things
glFlush();
// now switch to other buffer
glDrawBuffer( GL_FRONT );
glBindTexture( GL_TEXTURE_2D, pbuffer_texture );
CGLTexImagePBuffer( context, pbuffer, GL_BACK );
....
Why doesn't CGLFlushDrawable swap the buffers as the documentation seems
to indicate. Is this a bug, or am I miss-reading the documentation? Is
there another way to swap the buffers of a double buffered pbuffer?
thanks!
-j
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