(Fwd) Re: Stereo in a X Window

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Tom McReynolds (tomcat++at++proxima.asd.sgi.com)
Mon, 24 Jun 1996 21:54:34 -0700

Next message: Alex Heidet: "non orthogonal image generation"
Previous message: Jon Christensen: "real-time on multi-user systems"

You shouldn't need to use the XSync() calls. I wrote a stereo demo program
that works with both OpenGL and IrisGL. I'll put it up on the Performer
web-site and post it's location here.

Here's some of the relevant code fragments:

/* left =1 if left channel; 0 if right channel. Shared->stereo != 0 if
stereo visual could be obtained */

static void
DrawChannel (pfChannel *channel, void *left)
{

/* rebind light so it stays fixed in position */
pfLightOn(Sun);

    /* which buffer to draw into ? */
    if(Shared->stereo) { /* if not stereo, draw to left all the time */
        if(*(int*)left) {
#ifdef IRISGL
            leftbuffer(1);
            rightbuffer(0);
#else
            glDrawBuffer(GL_BACK_LEFT);
#endif
        } else {
#ifdef IRISGL
            leftbuffer(0);
            rightbuffer(1);
#else
            glDrawBuffer(GL_BACK_RIGHT);
#endif
        }
    }
    /* erase framebuffer and draw Earth-Sky model */
    pfClearChan(channel);

/* invoke Performer draw-processing for this frame */
pfDraw();

/* draw Performer throughput statistics */

if (Shared->drawStats)
pfDrawChanStats(channel);

/* read window origin and size (it may have changed) */
pfGetPWinSize(pfGetChanPWin(channel), &Shared->winSizeX,
&Shared->winSizeY);

#ifdef IRISGL
if (!(WinType & PFPWIN_TYPE_X))
GetGLInput();
#endif /* GL type */
}

static int FBAttrs[] = {
    PFFB_RGBA,
    PFFB_DOUBLEBUFFER,
    PFFB_STEREO,
    PFFB_DEPTH_SIZE, 23,
    PFFB_RED_SIZE, 1,
    PFFB_STENCIL_SIZE, 1,
    None,
};

/* request a stereo window, and check to see if we got one; NOTE:
IrisGL erroneously says "yes" regardless. Stereo still functions
properly if stereo visual is available, however */

static void
OpenPipeWin(pfPipeWindow *pw)
{
    pfPipe *p;
    Window w;
    Display *dsp;
    int stereo;

/* set up stereo */

pfPWinFBConfigAttrs(pw, FBAttrs);

pfOpenPWin(pw);

(void)pfQueryPWin(pw, PFQWIN_STEREO, &Shared->stereo);

/* give up if the system doesn't support stereo */

    if(Shared->stereo == PFQFTR_FALSE)
        pfNotify(PFNFY_NOTICE, PFNFY_RESOURCE,
                 "Couldn't get a stereo window; using mono mode");

#ifdef IRISGL
    if (!(WinType & PFPWIN_TYPE_X))
    {
        /* register events of note with event-queue manager */
        qdevice(ESCKEY);
        qdevice(F1KEY);
        qdevice(GKEY);
    }
#endif /* GL type */

    /* create a light source in the "south-west" (QIII) */
    Sun = pfNewLight(NULL);
    pfLightPos(Sun, -0.3f, -0.3f, 1.0f, 0.0f);
}

Hope this helps!

-Tom

--- Forwarded mail from rainer++at++rus.uni-stuttgart.de

From: "Daniela Rainer" <zrgr0390++at++visin2.rus.uni-stuttgart.de>
Date: Fri, 14 Jun 1996 11:30:32 +0000
In-Reply-To: "Sharon Clay" <src++at++rose.asd.sgi.com>
"Re: Stereo in a X Window is working now !" (Jun 13, 2:00pm)
Reply-To: rainer++at++rus.uni-stuttgart.de
X-Mailer: Z-Mail (3.2.1 6apr95 MediaMail)
To: "Sharon Clay" <src>
Subject: Re: Stereo in a X Window
Cc: info-performer++at++sgi.com

On Jun 13, 2:00pm, Sharon Clay wrote:
>
> Communicating through X is terribly slow - FYI, you definitey don't want
> to ever be doing an XSync() in your drawing!
> You can just select left and right buffers directly through the GL.
> For IRISGL it is leftbuffer() and rightbuffer() and for
> OpenGL it is glDrawBuffer(GL_BACK_LEFT or GL_BACK_RIGHT).
>
>-- End of excerpt from Sharon Clay

I use IRISGL based Performer with a X Window and the STR_BOT stereo mode.
Can I really use leftbuffer() and rightbuffer() for setting the buffer in a
GLX-window opened with pfuGLXWinopen (it doesn't work in my program)?

Regards

Daniela

--
----------------------------------------------------------------------------
Daniela Rainer

rainer++at++rus.uni-stuttgart.de
Tel.: ++49-(0)711-685-5970
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---End of forwarded mail from rainer++at++rus.uni-stuttgart.de

--
-----{-----{---++at++   -----{----{---++at++   -----{----{---++at++   -----{----{---++at++
Sharon Rose Clay (Fischler) - Silicon Graphics, Advanced Systems Dev.
src++at++sgi.com  (415) 933 - 1002  FAX: (415) 965 - 2658  MS 8U-590
-----{-----{---++at++   -----{----{---++at++   -----{----{---++at++   -----{----{---++at++


---End of forwarded mail from "Sharon Clay" <src++at++rose>

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