That's becoming even more weird:

GLFunctions::gl30()->glGenTextures(1, &texHandle);

returns 2 in texHandle.

but for using it in the shader it works for a value of 1 in the bindTexture

GLFunctions::gl30()->glBindTexture(GL_TEXTURE_2D, texHandle-1);

This is driving me nuts.

@KillerSmath That solved my problem. Thanks!

Dear Alain38,

Did you make it finally work? I got stocked with the exact same problem.

After some experimenting, the culprit was the MagnificationFilter. Although there were no problem setting the Magnification with QOpenGLTexture::NearestMipMapNearest with float images, with integer images, I had to set to QOpenGLTexture::Nearest.

@HarryLong said:

I would set this as solved but cannot figure out how...

Edit your first message's title to start with [SOLVED].