Re: GGI, EGCS/PGCC, Kernel source

Miguel de Icaza (
23 Feb 1998 22:48:07 -0600

> Seriously. One cannot do direct rendering OpenGL-in-a-window under X
> without GGI. The issue is multiple threads accessing the hw
> simultanously with hw graphics context switching. You don't want the X
> server to handle that.

You cannot do direct rendering with hardware that was not designed for
this. It does not have anything to do with GGI.

You use PC hardware, you suffer.

Direct rendering requires context switching support on the graphics
hardware and requires some sort of manager-controlled clipping that is
not accessible but to the board owner (mostly X).

> There's an article at
> which describes the why's and hows. This is for IRIX but the problems
> and sollutions applies to Linux as well.

No, it does not apply. They have nice hardware that was designed with
direct rendering in mind. PC users dont.


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