rscreen->screen.get_paramf = r600_get_paramf;
rscreen->screen.is_format_supported = r600_is_format_supported;
rscreen->screen.context_create = r600_create_context;
rscreen->screen.get_paramf = r600_get_paramf;
rscreen->screen.is_format_supported = r600_is_format_supported;
rscreen->screen.context_create = r600_create_context;