Synchronization of a gamma map switch with the vertical retrace

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From: Christophe Delépine (christophe.delepine++at++tts.thomson-csf.com)
Date: 03/16/2000 02:35:54

To video gurus:

My application needs to change the gamma map (using
XSGIvcSetChannelGammaMap) of a given video channel. The problem is that
assigning a new gamma map seems to have an immediate effect (the RAMDAC
switches to the new gamma map while refreshing the image on the
monitor).
To minimize the artefact, i activate the gamma map (by calling glXWaitX)
just after pfVClockSync(1, 0) so that only the very top part of the
image is wrong during the first redraw.
Is there a better way ?

Thanks

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