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
When running in a purely swrast environment (such as with LIBGL_ALWAYS_SOFTWARE), the extension is not exposed by mesa, but wayland is still possible with wl_shm. https://bugzilla.gnome.org/show_bug.cgi?id=704750 Reviewed-by: Neil Roberts <neil@linux.intel.com> (cherry picked from commit 8d4e4b0e8062708cece4d4c929abccc492ee21cc)