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catalyst 13.1 out of line for glReadPixels

Question asked by yousry on May 16, 2013

Sorry, I can only test with  a catalyst driver on my notebook at the moment:


I created a texture with:

    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB32UI, width, height, 0, GL_RGB_INTEGER, GL_UNSIGNED_INT, NULL);


A shader writes in it with:


out uvec3 FragColor;
FragColor = uvec3(...);


in this case it writes the values (100,0,0) into the color channels.


Than I use a FBO and read the pixels with:


GLuint Pixel[3];
glReadPixels(x, y, 1, 1, GL_RGB_INTEGER, GL_UNSIGNED_INT, &Pixel);


The output is unexpected and looks like this:

printf("%u  %d\n", Pixel[0], Pixel[0]);


4294967196  -100


The same source works flawless with geforce and osx driver.