(In reply to Nicolai Hähnle from comment #16)
> (Old versions of) AstroMenace use glTexStorage2D to create a texture with an
> incomplete mipmap pyramid (the 1x1 level is missing). This pyramid is not
> honored by the state tracker's implementation of glGenerateMipmap, which
> results in various broken textures.

Hmm I totally missed this when I fixed pretty much the same bug in mesa core
mipgen code. I guess it's a real pity there's no piglit test for this...