[Xorg] X on OpenGL

Andy Sy andy at nospam.com
Fri Jul 9 17:49:49 PDT 2004

Adam Jackson wrote:

>>The one big problem I see with the OpenGL API is that it does not give
>>you any direct pixel-level access to the frame buffer and wouldn't it
>>be extremely kludgy to build a windowing system without such?
> man glReadPixels.
> - - ajax

Right... glReadPixels, glCopyPixels and glDrawPixels... however
everyone says that implementations of these are dog-slow (abuse
of the hardware) and you're better off writing to a texture (which
is kludgy in many contexts)...


Why is it that OpenGL drivers seem to universally have this behaviour?

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