RE: [info-performer] pfTex subload problem/question

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From: Dorosky, Christopher G (christopher.g.dorosky++at++lmco.com)
Date: 03/25/2004 08:04:16

You made no attempt to clear up all the GL matrix, ortho and other stuff
that Performer
left over. You need to clear this up, do your thing, then put it back.

This may not be it, but it is suspicious.

Chris

-----Original Message-----
From: owner-info-performer++at++performer.engr.sgi.com
[mailto:owner-info-performer++at++performer.engr.sgi.com]On Behalf Of Gary
Quinn
Sent: Thursday, March 25, 2004 9:24 AM
To: info-performer++at++performer.engr.sgi.com
Subject: [info-performer] pfTex subload problem/question

  PfHi !

  I'm trying to grab the frame buffer into a pfTex,
  ultimately for dome distortion, but I'm getting
  strange results...

  When I read the framebuffer, and draw a textured
  GL_QUAD in the top right of the frame I'm getting
  different (and wrong) results on an O2 and a PC.

  On an O2 performer 2.5.3 runtime...
  http://vr.tees.ac.uk/gary/grab_sgi.jpg

  The topleft triangle (of the GL_QUAD) is
  correct, but the bottom right triangle is
  wrong.

  However, on a PC performer 3.0.2
  http://vr.tees.ac.uk/gary/grab_pc.jpg
  the whole GL_QUAD texture is sheared, and
  the amount of shear changes at each frame

  To setup the pfTexture...

      texture = pfNewTex(shared->arena);
      image = (unsigned int *)pfMalloc(sizeof(unsigned
int)*sizeTex*sizeTex, shared->arena);

      pfApplyTEnv( pfNewTEnv( shared->arena ) );

      pfTexLoadMode(texture, PFTEX_LOAD_SOURCE,
PFTEX_SOURCE_FRAMEBUFFER);

      pfTexFormat(texture, PFTEX_EXTERNAL_FORMAT, PFTEX_PACK_8);
//PFTEX_PACK_8
      pfTexFormat(texture, PFTEX_INTERNAL_FORMAT, PFTEX_RGBA);
//PFTEX_RGBA_8
      pfTexFormat(texture, PFTEX_IMAGE_FORMAT, PFTEX_RGBA); //PFTEX_RGBA
     
      pfTexName(texture, "Frame Buffer Texture");
      pfTexImage(texture, image, 4, sizeTex, sizeTex, 1);

      pfTexLoadOrigin(texture, PFTEX_ORIGIN_SOURCE, 0, 0);
      pfTexLoadOrigin(texture, PFTEX_ORIGIN_DEST, 0, 0);
      pfTexLoadSize(texture, sizeTex, sizeTex);
    
      pfTexFormat(texture, PFTEX_SUBLOAD_FORMAT, PF_ON);
      pfTexFilter(texture, PFTEX_MINFILTER, PFTEX_BILINEAR);
      pfTexFilter(texture, PFTEX_MAGFILTER, PFTEX_BILINEAR);

      pfApplyTex(texture);

  Then to use the texture after pfDraw() in the draw callback...

    pfLoadTex(texture);

    glColor3f(1.0f, 1.0f, 1.0f);

    glBegin(GL_QUADS);

      glVertex2f(xsize/2.0f, ysize/2.0f);
      glTexCoord2f(0.0f,0.0f);
      
      glVertex2f(xsize,ysize/2.0f);
      glTexCoord2f(0.0f,1.0f);
      
      glVertex2f(xsize,ysize);
      glTexCoord2f(1.0f,1.0f);
      
      glVertex2f(xsize/2.0f,ysize);
      glTexCoord2f(1.0f,0.0f);

    glEnd();

  In an attempt to narrow down the problem, I
  tried ...

  pfSaveTexFile(texture, filename);
  but that just gives me a blank image in the file.

  Sadly, www.dorbie.com seems to be down :-(

  What am I doing wrong ?

  Cheers,
  Gary. 

-- 

Gary Quinn, VR Centre            Technical Manager 
University of Teesside           SGI Network Admin 
Borough Road, Middlesbrough              Go Player 
Cleveland, TS1 3BA          mailto:Gary++at++tees.ac.uk 
+44 (0)1642 384303 fax 384310 http://vr.tees.ac.uk 

#include <std.disclaimer>

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