Make it possible to pass state-tracker-specific data to the
init_screen function, and even open the door for device-specific
state-tracker screen initialization.
Signed-off-by: Thomas Hellstrom <thellstrom-at-vmware-dot-com>
This works on top Gallium and KMS. The only thing that
does not work currently is swap buffers for shown mesa
screens. So the only fun thing this will produce is a
white screen.
The driver wishing to us the state_tracker needs to
implement the intrace as define in drm_api.h located
in gallium/include/state_tracker. And also have a
working KMS implementation.
