OpenGL mipmapping inconsistent?

Question

I have a 512X512 texture which holds a number of images that i want to use in my application. After adding the image data to the texture i save the texture coords for the individual images. Later i apply these on some quads that i am drawing. The texture has mipmapping activated.

When i take a screenshot of the rendered scene at exactly the same instance in two different runs of the applications, i notice that there are differences in the image only among those quads textured using this mipmapped texture. Can mipmapping cause such an issue?

Answer 1

My best guess is that it has to do with precisions in your shader. Check out this problem that I had (and fought with for a while) and my solution:

opengl texture mapping off by 5-8 pixels

It probably is a combination of mimapping's automatic scaling of your texture atlas and the precision hints in your shader code.

Also see the other linked question:

Why is a texture coordinate of 1.0 getting beyond the edge of the texture?