Hi David, When you use Image::allocateImage(..) you pass in pixel format, not the internal texture format, so you should use GL_RGBA, and GL_FLOAT for the type. Then follow up with a call to image->setInternalTextureFormat(..) with the appropriate internal format i.e. GL_RGBA32F_ARB.
Also when setting the data casting the char* to a float* would make things much easier. Robert. On 21 November 2014 13:29, Heitbrink, David A <[email protected]> wrote: > I am trying to use a 32 bit RGBA texture to use as a look up table in a > shader to do color correction. If I setup a texture in the following manner > I get nothing but a blank image (for my test shader, I am just outputting > the color of my LUT texture): > > > > m_pLUTImage = new osg::Image(); > > m_pLUTImage->allocateImage(1600,1200,1,GL_RGBA32F_ARB,GL_FLOAT); > > //////// > > unsigned char* buff = m_pLUTImage->data(); > > > > float r =0.0; float g=1.0; float b = 1.0; float a = 1.0f; > > for (unsigned int i = 0; i < 1600; i++){ > > for (unsigned int j =0; j < 1200; j++){ > > memcpy(&(buff[(i * 1600 + j) * 4+0] ), > &r,4); > > memcpy(&(buff[(i * 1600 + j) * 4+4] ), > &g,4); > > memcpy(&(buff[(i * 1600 + j) * 4+8] ), > &b,4); > > memcpy(&(buff[(i * 1600 + j) * 4+12]), > &a,4); > > } > > } > > m_pLUT = new osg::Texture2D(); > > m_pLUT->setImage(m_pLUTImage); > > m_pLUT->setDataVariance(osg::Object::DYNAMIC); > > > > If I do: > > m_pLUTImage->allocateImage(1600,1200,1,GL_RGBA,GL_BYTE); > > > > and I change how I fill the texture to deal with the different types I get > what I am expecting. > > > > What am I doing wrong here? > > > > _______________________________________________ > osg-users mailing list > [email protected] > http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org > >
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