Re: [info-performer] how to determine how many pipes are on a Prism system

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From: Allan Schaffer (allan++at++sgi.com)
Date: 12/01/2005 18:00:05

John Kelso wrote:
> So it looks like I can maybe use the getinvent() call on our SGIs, and
> Amir's code on our Prisms?

Right. Or if all your pipes are configured to be :0.0, :0.1, :0.2, ...
then you can use the NumScreens macro for both platforms.

> and our one pipe Prism has:
>>file /dev/dri/*
> /dev/dri/card0: character special (226/0)
> /dev/dri/card1: character special (226/1)
>
>>ls -l /dev/dri
>
> crw-rw-rw- 1 root root 226, 0 2005-05-24 11:08 card0
> crw-rw---- 1 root video 226, 1 2005-05-24 11:08 card1
> So I'm confused.

Uh-oh. Is this a 1-pipe Prism Deskside? All the other Prism configs
are 2 pipes minimum, so perhaps we've overlooked this case.

> And doesn't each graphics pipe have two video outs?

Yes - but - AFAIK they are not treated as different Display or Screen
id's as far as the X server is concerned. The details are configurable
but my understanding is the 2 video-outs (2 channels) are ID'd from one
X screen.. Like outputs from the same DG on an IR system.

Allan 

-- 
Allan Schaffer                                            allan++at++sgi.com
Engr. Dept. Manager, Visual Systems Group                1-650-933-2160
Silicon Graphics                                     http://www.sgi.com

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