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?
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