[Mesa-dev] intel: EGL_KHR_gl_image v3

[Abdiel Janulgue]

v3 here. Hopefully I've addressed the issues.

In this revision, we now report GL_INVALID_OPERATION when we 
can't resolve back to specific offsets within a shared region.
For non-tile-aligned HW, this means that only base-levels of
textures can be exported.

I've also found and fixed an error in my previous code where I 
calculated the wrong offsets because the slices weren't taken 
into consideration. Because of the fix, all miplevels of cubemap faces 
are now working nicely in this version.

If I still missed something, please let me know. I've also
submitted some new piglit-tests based on the review.

Cheers,
Abdiel