[Xorg] X on OpenGL

[Keith Packard]

Around 7 o'clock on Jul 10, Andy Sy 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?

X has been implemented on many systems without direct pixel access; as 
long as the system provides the basic pixel manipulations necessary for 
the core (and Render) protocols, we're all set.  And, as ajax says, we can 
always use glReadPixels

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