reading depth map

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rama++at++graphics.cis.upenn.edu
Thu, 6 Jul 1995 18:53:31 -0400

I am trying to create the shadow maps from the depth map.
My output didnt look right and so I have now traced my problem
to reading the zmap. For debugging purposes, I am trying to
read the zmap after the scene has been drawn from the initial view
point and printing out the zmap values.

I am using the perfly setup, which has the
pfChanCullFunc and pfChanDrawFunc specified.

    pfChanCullFunc(chan, CullFunc);
    pfChanDrawFunc(chan, DrawFunc);

In the DrawFunc, I am doing the following :
void
DrawFunc(pfChannel *chan, void *data)
{

    int i,j;
    unsigned long smap[(SSIZE*SSIZE)];

    PreDraw(chan, data); /* e.g. - clear the viewport */

    zbuffer(TRUE);
    blendfunction(BF_ONE,BF_ZERO);
    zfunction(ZF_LEQUAL);
    lsetdepth(0x0,0xffff);
    pfClear(PFCL_COLOR|PFCL_DEPTH,NULL);
    wmpack(0x0);
    pixmode(PM_ZDATA,1);
    readsource(SRC_ZBUFFER);

    pfDraw(); /* Render the frame */

    lrectread((short)0,(short)0,(short)SSIZE-1,(short)SSIZE-1,smap);
    for(i=0;i<(SSIZE)/2;i++)
      printf("after:%x\n ",smap[i]);

    pixmode(PM_DATA,0);
    PostDraw(chan, data); /* e.g. - draw HUD, read GL devices */
}

The values that get printed from smap are either only 0 or 10000000.

The other problem is that as I make different windows (other than
performer window) active by clicking the mouse there, the values
toggle :

10000000 for performer window
0 for any other window

I am sure I am doing something very obviously wrong but just unable
to figure it out. I would greatly appreciate any help I can get
about this.

Thanks
Rama
---------------------------------------------------------------------
Rama Bindiganavale
rama++at++graphics.cis.upenn.edu
http://www.cis.upenn.edu/~rama/home.html
---------------------------------------------------------------------
Rama Bindiganavale
rama++at++graphics.cis.upenn.edu
http://www.cis.upenn.edu/~rama/home.html

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