Re: Indigo -> Onyx

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Allan Schaffer (aschaffe++at++shark.paris.sgi.com)
Thu, 16 Mar 1995 19:36:29 +0100

This won't work because you're making GL calls from within the
Application process. It was OK on the Indigo because you were
running in single-process mode. But on the Onyx, Performer splits
itself up into multiple processes whose tasks are quite distinct.

For this to work you'll need to move the calls to qdevice (and any
other GL calls) into a callback to be called by the Draw process.

Here's a better description from the FAQ:

  Subject: -15- How do I make GL calls from within a IRIS Performer program?
  Date: 26 Oct 93 00:00:01 EST

  GL calls can only be made from a process that has a GL context. In
  multi-process Performer applications only the draw process has GL
  context, so you must make your GL calls in a function called in the
  draw process.

  The pipe initialization callback, draw function callback, and node
  draw callbacks are all executed in the draw process.

  In an application that only will ever run single-process, GL calls
  can be made from anywhere in the program.

  To set up a pipe initialization callback, see the pfInitPipe() man page.
  To set up a draw function callback, see the pfChanDrawFunc() man page.
  To set up a node draw callback, see the pfNodeTravFuncs() man page.

Allan

On Mar 16, 6:56pm, abrend++at++idt.unit.no wrote:
>
> I'm stuck! I have written a simple viewer using Performer and GL
> routines. These was written on an Indigo with Performer 1.2 and IRIS
> 5.3. Now I got to use an Onyx RE2 and my viewer stopped running. I
> think I'm doing something wrong when reading the input devices (mouse
> and keyboard). My app. runs just fine on the Indigo. What I do is
> this :
>
> qdevice(RIGHTMOUSE);
> qdevice(WINQUIT);
> qdevice(LEFTARROWKEY);
> qdevice(RIGHTARROWKEY);
> qdevice(DOWNARROWKEY);
> qdevice(UPARROWKEY);
> qdevice(PAGEUPKEY);
> qdevice(PAGEDOWNKEY);
> qdevice(HOMEKEY);
> qdevice(PADPLUSKEY);
> qdevice(PADMINUS);
> qdevice(PKEY);
>
> while (!done)
>
> {
> /* Go to sleep until next frame time. */
> pfSync();
>
> while (qtest())
> {
> short arg;
> switch (qread(&arg))
> {
> case (PAGEUPKEY):
> zDirection += step;
> break;
>
> case (PAGEDOWNKEY):
> zDirection -= step;
> break;
>
> .......
>
> }
> }
> }
>
> Do anyone do something similar ? What could be wrong ?

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

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