Could someone tell me what is the interface between the Quartz
compositor output and the graphics card ? The documentation says
QC output is given as a openGL object when Quartz Extreme is
available. Is it given as OpenGL object to the card even when there
is no hardware acceleration ?
I'm not sure I understand completely your question, but the base
thing is that Quartz Composer renders to an OpenGL context (i.e.
produces OpenGL contents), which must be hardware accelerated. So
yes, its "output" is on the video card, but not necessary on screen
(you can render to a pBuffer or bring the data back to the main memory).
