Problems with DrawChannel and MultiProcess

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Sibylle Steck (sib++at++kyb.tuebingen.mpg.de)
Fri, 5 Feb 1999 18:07:30 +0100

Hi pfAll,

I have a problem with writing pixels of an image to the frame buffer. In the
single process mode I can see the picture (which is draw with glDrawPixels) and
also a message (which is draw with pfuDrawMessage). In the multiprocess mode I
see only the message and the pictures is only a black hole.

Any help would be appreciated,
thanks for your time.

Greetings
Sibylle Steck

P.S.: I have my DrawChannel function attached

-- 
-----------------------------------------------------------


     _/     _/  _/_/_/  _/_/_/   Sibylle Steck
    _/_/ _/_/  _/   _/   _/      Max-Planck Institut f"ur
   _/  _/ _/  _/_/_/    _/       biologische Kybernetik
  _/     _/  _/        _/        Spemannstrasse 38
 _/     _/  _/      _/_/_/       72076 T"ubingen, Germany


phone: +49-7071-601 630
fax  : +49-7071-601 616
web  : www.kyb.tuebingen.mpg.de
email: sibylle.steck++at++tuebingen.mpg.de
-----------------------------------------------------------




/*******************************************/
static void DrawChannel (pfChannel *channel, void *)
/*******************************************/
{
  //static pfMatrix idmat;
  static pfMatrix tempmat;
  static int first = 0;
  int ind = 500;


  // cursor invisible
  if(!first) {
    pfuCursor(pfuGetInvisibleCursor(),ind);
    pfuLoadPWinCursor(Shared->pw,ind); 
    first = 1;
  }
  
  
  // rebind light so it stays fixed in position 
  pfLightOn(Sun);


  
  // erase framebuffer and draw Earth-Sky model 
  pfClearChan(channel);


  // invoke Performer draw-processing for this frame 
  pfDraw();
    
/* 3D graphics */


    glDepthFunc(GL_ALWAYS);
    glDepthMask(GL_FALSE);
    pfPushState();    
    pfBasicState();
    glTranslatef(Shared->view.xyz[0], Shared->view.xyz[1], 0.0f);
    glRotatef(Shared->view.hpr[0], 0.0f, 0.0f, 1.0f);


    pfPopState();
    glDepthFunc(GL_LEQUAL);
    glDepthMask(GL_TRUE);


/* end 3D graphics */


  // 2D graphics 


  glDepthFunc(GL_ALWAYS);  // Tiefenvergleich, default less, malt immer
  glDepthMask(GL_FALSE);   // schreiben in z-buffer, disabled (FALSE)
  pfPushState();           //
  pfBasicState();
  pfTransparency(PFTR_HIGH_QUALITY);
  glGetFloatv(GL_PROJECTION_MATRIX, (GLfloat *)tempmat);
  // get PROJECTION_MATRIX
  glMatrixMode(GL_PROJECTION); // umschalten zwischen Projektions- Viewport-, 
  // und Modellviewport Matrix
  glLoadMatrixf((GLfloat *)idmat);
  glOrtho(-1.0f, 1.0f, -1.0f, 1.0f, 1.0f, -1.0f); // orthogonal projektion
  glMatrixMode(GL_MODELVIEW); // Observer Viewpoint
  pfPushMatrix();
  pfLoadMatrix(idmat);
  // set pixel storage modes
  // glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
  //1, (32 bit),4,8 aendert nichts


  //Draw grey rectangle
  glColor3ub(70,70,70);
  glRectf(-1.0f, -1.0f, 1.0f, 1.0f);


  // Draw Picture 
  glRasterPos2f(0.15f,-0.25f);
  glDrawPixels(IMAGESIZE, IMAGESIZE, GL_RGB, GL_UNSIGNED_BYTE, 
	       Picture[Shared->showR]);
  glRasterPos2f(-0.95f,-0.25f);
  glDrawPixels(IMAGESIZE, IMAGESIZE, GL_RGB, GL_UNSIGNED_BYTE, 
	       Picture[Shared->showL]);


  // Draw Text on Screen
  pfuDrawMessage(NULL, "Welches Objekt liegt hoeher?",
		 PFU_MSG_PIPE, PFU_CENTER_JUSTIFIED, 0.5f, 0.1f, PFU_FONT_MED, PFU_RGB); 
  
  if(Shared->blank) {
    //Draw grey rectangle
    glColor3ub(70,70,70);
    glRectf(-1.0f, -1.0f, 1.0f, 1.0f);
  }


  pfPopMatrix();
  glMatrixMode(GL_PROJECTION);
  glLoadMatrixf((GLfloat *)tempmat);
  glMatrixMode(GL_MODELVIEW);
  pfPopState();
  glDepthFunc(GL_LEQUAL);   /* the default */
  glDepthMask(GL_TRUE);
 
  // read window origin and size (it may have changed)     
    pfGetPWinSize(pfGetChanPWin(channel), &Shared->winSizeX, &Shared->winSizeY);
}

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