mesa: fix mipmap generation for immutable, compressed textures
If the immutable compressed texture didn't have the full mip pyramid, this didn't work, because it tried to generate mip levels for non-existing levels. _mesa_prepare_mipmap_level() would correctly handle this by returning FALSE if the mip level didn't exist, however we actually created the non-existing mip level right before that because we used _mesa_get_tex_image() before calling _mesa_prepare_mipmap_level(). It would then proceed to crash (we allocated the mip level, which is a bad idea on an immutable texture, but didn't initialize the values, leading to assertion failures or segfaults). Fix this by using _mesa_select_tex_image() instead and call it after _mesa_prepare_mipmap_level(), as that function will allocate missing mip levels for non-immutable textures already. This fixes a (2 year old) crash with astromenace which was hack-fixed in ubuntu packages instead: http://bugs.debian.org/718680 (I guess most apps do full mip chains - I believe this app not doing it is actually unintentional, always one level less than full mip chain...). Cc: "10.6 11.0" <mesa-stable@lists.freedesktop.org> Reviewed-by:Brian Paul <brianp@vmware.com> (cherry picked from commit 19604d30)
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