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The OpenGL Es 2.0 Programming Guide (Munshi et al., 2008) says the dimensions must be a power of two (unless the driver supports the extension “GL_OES_texture_npot”, which allows non-power-of-two textures to be MIP mapped).
But Is it safe to assume, that MIP mapped textures don’t have to be quadratic as well, i.e. dimensions such as 1024×512 are allowed?
It is also my understanding that such dimensions are allowed.
I’d just like to point out that the POT vs NPOT dimensions is an issue different to square vs non-square.