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a945890de6
This detects when we are running on any of Mesa's software rasterizer backends and disables use of glBlitFramebuffer and glXCopySubBuffer. Both of these currently result in full-screen copies so there's little point in using these to optimize how much of the screen we present. To help ensure we re-evaluate this workaround periodically we have added a comment marker of "ONGOING BUG" above the workaround and added a note to our RELEASING document that says we should grep for this marker and write a NEWS section about ongoing bug workarounds. https://bugzilla.gnome.org/show_bug.cgi?id=674208 Reviewed-by: Neil Roberts <neil@linux.intel.com> (cherry picked from commit 11f2f6ebb42398978ec8dd92b3c332ae8140a728)