Re: Overhead for rendering multiple windows

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Colin Bridgewater (colinb++at++equipe.ltd.uk)
Wed, 29 Jul 1998 14:15:56 +0100

Angus Dorbie wrote:
>
> Colin Bridgewater wrote:
>> ... 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?

So, handling the X layer is done in hardware is it ?

Sceptical, Colin

-- 


Colin Bridgewater


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Equipe Electronics Ltd.


"Visualising Your Imagination"


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