[osg-users] GL_RGBA32F_ARB Pixel Buffer

Wiedemann, Rudolf, OPS3 rudolf.wiedemann at mbda-systems.de
Wed Mar 11 04:13:44 PDT 2009


Hi Steven,

try
  setInternalTextureFormat(GL_RGBA32F_ARB);
  setPixelFormat(GL_RGBA);
  setDataType(GL_FLOAT);


Rudi

-----Original Message-----
From: osg-users-bounces at lists.openscenegraph.org
[mailto:osg-users-bounces at lists.openscenegraph.org] On Behalf Of Guy
Sent: Wednesday, March 11, 2009 7:23 AM
To: osg-users at lists.openscenegraph.org
Subject: Re: [osg-users] GL_RGBA32F_ARB Pixel Buffer


Hi Steven,
 I'm not so sure, but maybe you should try to set the render target
implementation to FRAME_BUFFER_OBJECT, as done in the prerender example?

What graphics card do you use?
Does it work for you with GL_RGBA16F_ARB?

Guy.


I'm getting all 0s for my pixel buffer when I use GL_RGBA32F_ARB as the
pixel format.
It works fine with GL_RGBA.

This is how I set it up:

                i = new osg::Image();
                i->setPixelFormat(GL_RGBA32F_ARB);
                i->setDataType(GL_FLOAT);
 
camera->attach(osg::Camera::BufferComponent(osg::Camera::COLOR_BUFFER0),
i.get());
           camera->setRenderOrder(osg::Camera::PRE_RENDER);
 
camera->setRenderTargetImplementation(osg::Camera::PIXEL_BUFFER);

Then when I try to retrieve the pixel values:

        if (_image.valid() && _image.get() && _image.get()->data())
        {

            float *tempData = (float*)_image.get()->data();
            for (int i = 0; i < sliceVPX * sliceVPY; i+=4)
            {

                    debug<<Debug::info<<"Pix ["<<i<<"] =
"<<tempData[i]<<", "<<tempData[i+1]<<", "<<tempData[i+2]<<",
"<<tempData[i+3]<<"\n";

            }
        }


I get all zeros. 

Can anyone help me out. again using GL_RGBA and GL_UNSIGNED_BYTE works
fine.

I'm using OSG 2.2

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http://forum.openscenegraph.org/viewtopic.php?p=8184#8184





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