Re: Overhead for rendering multiple windows

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Angus Dorbie (dorbie++at++sgi.com)
Wed, 29 Jul 1998 05:40:31 -0700

Colin Bridgewater wrote:
>
> Hi Folks
>
> Regarding the overhead involved in rendering multiple windows from one
> graphics pipe, the Performer Progammers' Guide states:
>
> > The use of multiple windows on a single graphics pipe can add
> > overhead. The sharing of the graphics context between windows
> > consumes almost all of this overhead.
>
> Would anyone care to be more specific as to what "almost" means ?

Well how much does a glViewport, glFrustum, a modelview loadmatrix,
a couple of matrix mode changes a glScissor and potentially another
glClear (quite reasonably ignoring the time taken to actually
perform the clear) cost?

Not very much.

Cheers,Angus.

-- 
"Only the mediocre are always at their best." -- Jean Giraudoux 


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