FORUM ON AUGMENTED AND VIRTUAL REALITY

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Are you making sure the texture object you are trying to use is still
bound? In other words,

glBindTexture(GL_TEXTURE_2D, 100);
/* define your framebuffer sourced texture */
glCopyTexImage2D(GL_TEXTURE_2D,0,GL_RGBA,0,0,TEXTURE_WIDTH,TEXTURE_HEIGHT,0);


You can now recall the texture object you just defined with
glCopyTexImage2D. So before you try to use the subimage call call
glBindTexture again like this,

glBindTexture(GL_TEXTURE_2D, 100);
glCopyTexSubImage2D(GL_TEXTURE_2D,0,0,0,0,0,TEXTURE_WIDTH,TEXTURE_HEIGHT);

This will recall your texture object that you defined before. I picked
the number 100 out of thin air it is actually more correct to call
glGenTextures to create your texture object names. glGenTextures will
make sure textures names do not conflict within the same graphics
context.

Brian



Oliver Bimber wrote:
> 
> FORUM ON AUGMENTED AND VIRTUAL REALITY
> 
> --------------------------- ListBot Sponsor --------------------------
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> 
> brian,
> 
> i use(d):
> glCopyTexImage2D(GL_TEXTURE_2D,0,GL_RGBA,0,0,TEXTURE_WIDTH,TEXTURE_HEIGHT,0);
> and tried:
> glCopyTexSubImage2D(GL_TEXTURE_2D,0,0,0,0,0,TEXTURE_WIDTH,TEXTURE_HEIGHT);
> 
> but there's no texture in the texture memory...;-)
> what's wrong with it?
> both commands have almost the same parameters. the only difference is, that the
> glCopyTexImage2D command allows to specify the internal
> color format (GL_RGBA in my case) and the border flag (0 in my case). glCopyTexSubImage2D
> has the xoffset and yoffset parameters (which i played around with and set them to 0,0 or
> 1,1).
> 
> glCopyTexImage2D works but glCopyTexSubImage2D doesn't.
> what am i doing wrong?
> 
> --oliver
> 
> ______________________________________________________________________
> To unsubscribe, write to ARforum-unsubscribe@l ..........

-- 
    ----oOOo----    ----oOOo----    ----oOOo----    ----oOOo----

Brian Furtaw  (brian@s ......)	
Graphics Guru		       Office:(301)572-3293   Fax: (603)250-0370
12200-G  Plum  Orchard  Drive  OpenGL/Performer/OpenInventor/ImageVision	
Silver Spring, Maryland 20904  Volumizer/Optimizer/React/PCI Device
Drivers


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FORUM ON AUGMENTED AND VIRTUAL REALITY

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We have spent some time on the problem of getting 2d applications into a 3d
world and the biggest problem was updating the framebuffer to texture memory
in real time.  Our solution was to use Sirius video (On an SGI Onyx) with
several hacks including multi-processing, interleaved video multiple times,
etc.  The end result for is about 15 updates per second and some lag, but
these updates are independent of the rest of the world  (e.g. the rest of
the world renders at its own fps).  That is for a 720x486 source(into
1024x512 texture space) but the source can automatically be scaled in the
sirius hardware from a higher resolution.  We have done it with up to a
1600x1200 source at the same frame rate.  Let me know if you want a copy of
the paper.

An alternative to grabbing the desktop is to use the xvbf.  This would allow
to render directly to memory instead of the display.  Unfortunately there
were some bugs at the time that would need to be fixed in order to do this.
Not sure if those have been fixed since.

Microsoft Task Gallery was using a modified version of Windows 2000 at the
time to allow the framebuffer to be directly accessed.  I dont think this
made it into the final version of Win2000 though.

Jason





Jason Jerald                    Human-Centered Systems Department
mailto:jjerald@h ......          Information Sciences Laboratory
(310) 317-5622                  HRL Laboratories
http://home.earthlink.net/~jasonjerald

> -----Original Message-----
> From: Oliver Bimber [mailto:obimber@r .................]
> Sent: Wednesday, March 14, 2001 8:06 AM
> To: FORUM ON AUGMENTED AND VIRTUAL REALITY
> Subject: Re: [ARforum] glCopyTexSubImage2D
>
>
> FORUM ON AUGMENTED AND VIRTUAL REALITY
>
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>
> brian,
> sorry: my init function with the texture memory allocation did
> not get called ....
> it does work now.
> but i don't get a noticeable speed-up. i measured the average
> frame rate of both approaches.
> they are the same.
> --oliver
>
>
> Brian Furtaw wrote:
>
> > FORUM ON AUGMENTED AND VIRTUAL REALITY
> >
> > --------------------------- ListBot Sponsor --------------------------
> > Build a marketing database and send targeted HTML and text e-mail
> > newsletters
> > to your customers with List Builder.
> > http://www.listbuilder.com
> > ----------------------------------------------------------------------
> >
> > Are you making sure the texture object you are trying to use is still
> > bound? In other words,
> >
> > glBindTexture(GL_TEXTURE_2D, 100);
> > /* define your framebuffer sourced texture */
> >
> glCopyTexImage2D(GL_TEXTURE_2D,0,GL_RGBA,0,0,TEXTURE_WIDTH,TEXTURE
> _HEIGHT,0);
> >
> > You can now recall the texture object you just defined with
> > glCopyTexImage2D. So before you try to use the subimage call call
> > glBindTexture again like this,
> >
> > glBindTexture(GL_TEXTURE_2D, 100);
> >
> glCopyTexSubImage2D(GL_TEXTURE_2D,0,0,0,0,0,TEXTURE_WIDTH,TEXTURE_HEIGHT);
> >
> > This will recall your texture object that you defined before. I picked
> > the number 100 out of thin air it is actually more correct to call
> > glGenTextures to create your texture object names. glGenTextures will
> > make sure textures names do not conflict within the same graphics
> > context.
> >
> > Brian
> >
> > Oliver Bimber wrote:
> > >
> > > FORUM ON AUGMENTED AND VIRTUAL REALITY
> > >
> > > --------------------------- ListBot Sponsor --------------------------
> > > Build a marketing database and send targeted HTML and text e-mail
> > > newsletters
> > > to your customers with List Builder.
> > > http://www.listbuilder.com
> > > ----------------------------------------------------------------------
> > >
> > > brian,
> > >
> > > i use(d):
> > >
> glCopyTexImage2D(GL_TEXTURE_2D,0,GL_RGBA,0,0,TEXTURE_WIDTH,TEXTURE
> _HEIGHT,0);
> > > and tried:
> > >
> glCopyTexSubImage2D(GL_TEXTURE_2D,0,0,0,0,0,TEXTURE_WIDTH,TEXTURE_HEIGHT);
> > >
> > > but there's no texture in the texture memory...;-)
> > > what's wrong with it?
> > > both commands have almost the same parameters. the only
> difference is, that the
> > > glCopyTexImage2D command allows to specify the internal
> > > color format (GL_RGBA in my case) and the border flag (0 in
> my case). glCopyTexSubImage2D
> > > has the xoffset and yoffset parameters (which i played around
> with and set them to 0,0 or
> > > 1,1).
> > >
> > > glCopyTexImage2D works but glCopyTexSubImage2D doesn't.
> > > what am i doing wrong?
> > >
> > > --oliver
> > >
> > > ______________________________________________________________________
> > > To unsubscribe, write to ARforum-unsubscribe@l ..........
> >
> > --
> >     ----oOOo----    ----oOOo----    ----oOOo----    ----oOOo----
> >
> > Brian Furtaw  (brian@s ......)
> > Graphics Guru                  Office:(301)572-3293   Fax: (603)250-0370
> > 12200-G  Plum  Orchard  Drive  OpenGL/Performer/OpenInventor/ImageVision
> > Silver Spring, Maryland 20904  Volumizer/Optimizer/React/PCI Device
> > Drivers
> >
> > ______________________________________________________________________
> > To unsubscribe, write to ARforum-unsubscribe@l ..........
>
>
> ______________________________________________________________________
> To unsubscribe, write to ARforum-unsubscribe@l ..........
>


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brian,

i use(d):
glCopyTexImage2D(GL_TEXTURE_2D,0,GL_RGBA,0,0,TEXTURE_WIDTH,TEXTURE_HEIGHT,0);
and tried:
glCopyTexSubImage2D(GL_TEXTURE_2D,0,0,0,0,0,TEXTURE_WIDTH,TEXTURE_HEIGHT);

but there's no texture in the texture memory...;-)
what's wrong with it?
both commands have almost the same parameters. the only difference is, that the
glCopyTexImage2D command allows to specify the internal
color format (GL_RGBA in my case) and the border flag (0 in my case). glCopyTexSubImage2D
has the xoffset and yoffset parameters (which i played around with and set them to 0,0 or
1,1).

glCopyTexImage2D works but glCopyTexSubImage2D doesn't.
what am i doing wrong?

--oliver


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FORUM ON AUGMENTED AND VIRTUAL REALITY

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brian,
sorry: my init function with the texture memory allocation did not get called ....
it does work now.
but i don't get a noticeable speed-up. i measured the average frame rate of both approaches.
they are the same.
--oliver


Brian Furtaw wrote:

> FORUM ON AUGMENTED AND VIRTUAL REALITY
>
> --------------------------- ListBot Sponsor --------------------------
> Build a marketing database and send targeted HTML and text e-mail
> newsletters
> to your customers with List Builder.
> http://www.listbuilder.com
> ----------------------------------------------------------------------
>
> Are you making sure the texture object you are trying to use is still
> bound? In other words,
>
> glBindTexture(GL_TEXTURE_2D, 100);
> /* define your framebuffer sourced texture */
> glCopyTexImage2D(GL_TEXTURE_2D,0,GL_RGBA,0,0,TEXTURE_WIDTH,TEXTURE_HEIGHT,0);
>
> You can now recall the texture object you just defined with
> glCopyTexImage2D. So before you try to use the subimage call call
> glBindTexture again like this,
>
> glBindTexture(GL_TEXTURE_2D, 100);
> glCopyTexSubImage2D(GL_TEXTURE_2D,0,0,0,0,0,TEXTURE_WIDTH,TEXTURE_HEIGHT);
>
> This will recall your texture object that you defined before. I picked
> the number 100 out of thin air it is actually more correct to call
> glGenTextures to create your texture object names. glGenTextures will
> make sure textures names do not conflict within the same graphics
> context.
>
> Brian
>
> Oliver Bimber wrote:
> >
> > FORUM ON AUGMENTED AND VIRTUAL REALITY
> >
> > --------------------------- ListBot Sponsor --------------------------
> > Build a marketing database and send targeted HTML and text e-mail
> > newsletters
> > to your customers with List Builder.
> > http://www.listbuilder.com
> > ----------------------------------------------------------------------
> >
> > brian,
> >
> > i use(d):
> > glCopyTexImage2D(GL_TEXTURE_2D,0,GL_RGBA,0,0,TEXTURE_WIDTH,TEXTURE_HEIGHT,0);
> > and tried:
> > glCopyTexSubImage2D(GL_TEXTURE_2D,0,0,0,0,0,TEXTURE_WIDTH,TEXTURE_HEIGHT);
> >
> > but there's no texture in the texture memory...;-)
> > what's wrong with it?
> > both commands have almost the same parameters. the only difference is, that the
> > glCopyTexImage2D command allows to specify the internal
> > color format (GL_RGBA in my case) and the border flag (0 in my case). glCopyTexSubImage2D
> > has the xoffset and yoffset parameters (which i played around with and set them to 0,0 or
> > 1,1).
> >
> > glCopyTexImage2D works but glCopyTexSubImage2D doesn't.
> > what am i doing wrong?
> >
> > --oliver
> >
> > ______________________________________________________________________
> > To unsubscribe, write to ARforum-unsubscribe@l ..........
>
> --
>     ----oOOo----    ----oOOo----    ----oOOo----    ----oOOo----
>
> Brian Furtaw  (brian@s ......)
> Graphics Guru                  Office:(301)572-3293   Fax: (603)250-0370
> 12200-G  Plum  Orchard  Drive  OpenGL/Performer/OpenInventor/ImageVision
> Silver Spring, Maryland 20904  Volumizer/Optimizer/React/PCI Device
> Drivers
>
> ______________________________________________________________________
> To unsubscribe, write to ARforum-unsubscribe@l ..........


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