Rob Jenkins (robj++at++quid.engr.sgi.com)
Fri, 3 Apr 1998 12:08:26 -0800
What pfMultiprocess and pfMultithread calls do you make ? You might want to
look at the note in man pfMultithread about having parallel CULL per channel (
end of page 2 of that man page in pf 2.2 ). So something like:
/* operate all processing tasks in parallel */
pfMultiprocess(PFMP_FORK_CULL | PFMP_FORK_DRAW | PFMP_FORK_ISECT);
pfMultithread(0, PFPROC_CULL, 2);
Might help you.
Cheers
Rob
On Apr 3, 2:20pm, Michael Boccara wrote:
> Subject: ZB limits & Overlaid channels
> Hi Performers,
>
> For my space application, I have to use a very large Near/Far range :
1m/1e6km.
> I chose to superpose 2 channels, sharing all attributes except near/far and
draw
> callback.
> ChanFG : N = 1m F = 10km
> ChanBG : N = 10km F = 1e6km
> Better than a long speech, my piece of code is at the end of the message.
>
> If I used only 1 channel, it would draw all the scene.
> While my 2 channels draw 2 complementary parts of the scene, using draw
> traversal masks.
> So we should have the same graphic load...
>
> BUT using 2 superposed channels is almost twice longer than using only 1
channel
> !!!
>
> Question :
> 1/ Why does it take longer than using only 1 channel ?
> 2/ What does happen in the pfDraw() function that is uselessly repeated
between
> the 2 channels ?
> 3/ How come can I call twice pfDraw() without any argument, into each draw
> callback, letting Performer guess that it is for 2 separate channels ?
>
> I am using Performer 2.1 on an Onyx RE2, IRIX 6.2, 2 CPUs, 1 Pipe.
>
> Thanks for carrying me into the secrets of the depths of Performer...
> Hope I was clear in my message...
>
> Mike
>
> Code :
>
> static void
> InitChannel(pfPipe* pipe)
> {
> Shared->chanBG = new pfChannel(pipe);
> Shared->chanFG = new pfChannel(pipe);
> Shared->chanBG->attach(Shared->chanFG);
> Shared->chanFG->setShare(PFCHAN_FOV |
> PFCHAN_VIEW |
> PFCHAN_VIEW_OFFSETS |
> PFCHAN_SCENE |
> PFCHAN_SWAPBUFFERS |
> PFCHAN_SWAPBUFFERS_HW |
> PFCHAN_APPFUNC |
> PFCHAN_CULLFUNC |
> PFCHAN_VIEWPORT);
>
> // attaching the common pfScene
> Shared->chanFG->setScene(Shared->scene);
>
> // Customize pfDraw()
> Shared->chanFG->setTravFunc(PFTRAV_DRAW, drawFGChannel);
> Shared->chanBG->setTravFunc(PFTRAV_DRAW, drawBGChannel);
>
> // complementary clipping planes
> Shared->chanFG->setNearFar(.1e-3f, 10.0f);
> Shared->chanBG->setNearFar(10.0f, 1e6f);
>
> // chanFG is for Foreground Scene Group
> // chanBG is for Background Scene Group
> Shared->chanFG->setTravMask(PFTRAV_DRAW, FG_MASK);
> Shared->chanBG->setTravMask(PFTRAV_DRAW, BG_MASK);
> }
>
> // 2 draw callbacks
> //
> static void
> drawBGChannel(pfChannel *bgchan, void *)
> {
> // earthsky color/depth clear
> bgchan->clear();
>
> // 1st call to pfDraw
> pfDraw();
>
> if (Shared->drawStats == 1)
> bgchan->drawStats();
> }
>
> static void
> drawFGChannel(pfChannel *fgchan, void *)
> {
> // ONLY depth clear
> pfClear(PFCL_DEPTH, NULL);
>
> // 2nd call to pfDraw
> pfDraw();
>
> if (Shared->drawStats == 1)
> fgchan->drawStats();
> }
>
>
> --
> Michael Boccara / +1 (617) 253 00 05 / boccara++at++mit.edu
> =======================================================================
> List Archives, FAQ, FTP: http://www.sgi.com/Technology/Performer/
> Submissions: info-performer++at++sgi.com
> Admin. requests: info-performer-request++at++sgi.com
>-- End of excerpt from Michael Boccara
--
________________________________________________________________
Rob Jenkins mailto:robj++at++sgi.com
Silicon Graphics, Mtn View, California, USA
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