virgl: implement resource_create_front for vtest
This patch makes glXCopySubBuffer work correctly on vtest, and also fixes a couple of bugs that piglit glx/glx-copy-sub-buffer was hitting.
Edited by Italo Nicola
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This patch makes glXCopySubBuffer work correctly on vtest, and also fixes a couple of bugs that piglit glx/glx-copy-sub-buffer was hitting.