Package primus: Information

Primus is a shared library that provides OpenGL and GLX APIs and
implements low-overhead local-only client-side OpenGL offloading via GLX
forking, similar to VirtualGL. It intercepts GLX calls and redirects GL
rendering to a secondary X display, presumably driven by a faster GPU.
On swapping buffers, rendered contents are read back using a PBO and
copied onto the drawable it was supposed to be rendered on in the first
place.