Re: How to display the pfGeoSet

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Angel-Ventura Mendo Gomez (ventura++at++labri.u-bordeaux.fr)
Tue, 11 May 1999 15:49:21 +0200

Mr li Yonglin wrote:
>
> Hi, performers
> I am trying to construct my own pfGeoSet so that I can control it
> easily. I did it well in iris6.2 but after I transfered my codes from
> iris6.2 to iris6.4 I found my programs cannot compile and run. Then I
> use the codes in /usr/share/Performer/src/sample/C++/perfly and
> /usr/share/Performer/src/sample/C++/common plus my own programs to
> recompile and link. But it is funny that I can not see any thing on the
> screen. But the code I used can display my own pfGeoSets well on
> iris6.2.
> So any body knows how to display the objects of your own pfGeoSet. For
> example. How to construct and display a cube in perfly using your own
> codes. Especially how to display?
>
> Thanks in advance.
> -----------------------------------------------------------------------
> List Archives, FAQ, FTP: http://www.sgi.com/software/performer/
> Submissions: info-performer++at++sgi.com
> Admin. requests: info-performer-request++at++sgi.com

The problem is that if you use Multiprocesing you must allocate the
pfGeoSet in the
shared Arena and also the vertex array ex :

pfGeoSet *
GeoSetEditor::makeGeoSet(void *arena)
{
  pfVec3 *coords;
  pfVec4 *colors;

  coords = (pfVec3 *)pfMalloc(sizeof(pfVec3)*VERTEX_NUMBER,arena);
  coords[0].set(-2.0f, -2.0f, 2.0f );
  coords[1].set( 2.0f, -2.0f, 2.0f );
  coords[2].set( 2.0f, 2.0f, 2.0f );
  coords[3].set(-2.0f, 2.0f, 2.0f );

  colors = (pfVec4 *)pfMalloc(sizeof(pfVec4)*VERTEX_NUMBER,arena);
  colors[0].set(1.0f, 1.0f, 1.0f, 1.0f);
  colors[1].set(0.0f, 0.0f, 1.0f, 1.0f);
  colors[2].set(1.0f, 0.0f, 0.0f, 1.0f);
  colors[3].set(0.0f, 1.0f, 0.0f, 1.0f);

  pfGeoSet gset = new(arena) pfGeoSet();
  
  gset->setAttr(PFGS_COORD3, PFGS_PER_VERTEX, coords, NULL);
  gset->setAttr(PFGS_COLOR4, PFGS_PER_VERTEX, colors, NULL);
  gset->setPrimType(PFGS_QUADS);
  gset->setNumPrims(1);

 return gset;
}

and now the main :

void
main(void)
{

                .......

  pfConfig();

  sharedData->geoSet=makeGeoSet(pfGetSharedArena());
                ......

   sharedData->chanel = new pfChannel(p);

    sharedData->chanel->setChanData(&sharedData, sizeof(SharedData *));
    sharedData->chanel->passChanData();
    sharedData->chanel->setTravFunc(PFTRAV_DRAW,DrawChannel);

        ect ...

  while (1){
                ...
  }

}
  
static void
DrawChannel (pfChannel *, void *userData)
{
  SharedData **ptr=(SharedData **)userData;
  SharedData *sharedData=(*ptr);

  static int i=0;
  static pfVec4 clr[] = { pfVec4(1.0f, 0.0f, 0.0f, 1.0f),
                          pfVec4(0.0f, 0.0f, 1.0f, 1.0f) };

  // erase framebuffer and draw Earth-Sky model
  pfClear(PFCL_COLOR | PFCL_DEPTH, &clr[i]);
  i^=1;

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

  // drawing pfGeoSet
  sharedData->geoSet->draw();
   

}

  
Et voila ;-)

        Good Luck 

-- 
	ventura++at++labri.u-bordeaux.fr
	http://dept-info.labri.u-bordeaux.fr/~ventura
	telephone 05.56.84.69.20


 Quod natura non dat Salmantica non praestat.

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