On Wed, 4 Jul 2012 12:25:08 +0100, Chris Wilson <chris at chris-wilson.co.uk> wrote: > The intention is to help select which engine to use for copies with > interoperating clients - such as a GL client making a request to the X > server to perform a SwapBuffers, which may require copying from the > active GL back buffer to the X front buffer. We choose to report a mask of the active rings to future proof the interface against any changes which may allow for the object to reside upon multiple rings. -Chris -- Chris Wilson, Intel Open Source Technology Centre