Re: Question about 2 pipes

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Allan Schaffer (allan)
Mon, 8 Sep 1997 17:47:17 -0700

On Sep 5, 2:37pm, Eddy Kuo wrote:
>
> I am trying to display images thru two pipes (physical pipe) on different
> screen. But I am keep getting an badwindow ID error. I setup my pipe as
> follows
> p[0] = pfGetPipe(0);
> p[0]->setWSConnectionName(":0.0");
> p[1] = pfGetPipe(1);
> p[1]->setWSConnectionName(":1.0");
> I then create windows for each p[0], p[1]. I can see the windows
> coming up and then I got an X Error of a bad WindowID
> I have tried setting the DISPLAY env, but it doesn't work.

First question; do you have a dual-display ("TKO") setup or just two
graphics pipes? If TKO, check out the example below from the
archives. But if you have a "standard" configuration (one keyboard,
two graphics pipes) the pipes need to be addressed as :0.0 and :0.1.

[my apologies if the attributions below are incorrect]

        From: "Dave Pape" <pape++at++evl.eecs.uic.edu>
        Date: Wed, 17 Apr 1996 05:54:55 -0500

> On Apr 15, 11:08am, Vali Lalioti wrote:
> >
> > I have a problem with using two pipes and two screens on a
> > machine that is set to the "triple keyboard option" (TKO).
> > The warning I get is that there is no screen 1, which
> > probably is true since with this option the displays are 0.0,
> > 1.0,2.0 instead of 0.0, 0.1, 0.2. Is there any way to solve
> > this problem? I include a small example and the error
> > messages.
> > sincerely yours,
> > Dr. V. Lalioti.

        I recently ran into on this problem as well. The program
        below shows the relevant calls which finally worked on our
        TKO. Note that this only works with the OpenGL libraries.
        If I compile with IrisGL, both windows are opened on the same
        display.

           -Dave

-----
#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#include <Performer/pf.h>

void config0(pfPipeWindow *pwin)
{
 pfOpenWSConnection(":0.0",TRUE);
 pfOpenPWin(pwin);
}

void config1(pfPipeWindow *pwin)
{
 pfOpenWSConnection(":1.0",TRUE);
 pfOpenPWin(pwin);
}

int main(int argc,char **argv)
{
 pfPipe *pipe[2];
 pfPipeWindow *pwin[2];

 pfInit();
 pfMultipipe(2);
 pfConfig();

 pipe[0] = pfGetPipe(0);
 pfPipeWSConnectionName(pipe[0],":0.0");
 pfPipeScreen(pipe[0],0);
 pwin[0] = pfNewPWin(pipe[0]);
 pfPWinOriginSize(pwin[0],0,0,512,512);
 pfPWinConfigFunc(pwin[0],config0);
 pfConfigPWin(pwin[0]);

 pipe[1] = pfGetPipe(1);
 pfPipeWSConnectionName(pipe[1],":1.0");
 pfPipeScreen(pipe[1],0);
 pwin[1] = pfNewPWin(pipe[1]);
 pfPWinOriginSize(pwin[1],0,0,512,512);
 pfPWinConfigFunc(pwin[1],config1);
 pfConfigPWin(pwin[1]);

 while (1)
        {
        pfSync();
        pfFrame();
        }
 pfExit();
}

-- 
Allan Schaffer                                                allan++at++sgi.com
Silicon Graphics                               http://reality.sgi.com/allan
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