-struct pipe_screen *vc4_screen_create(int fd);
-boolean vc4_screen_bo_get_handle(struct pipe_screen *pscreen,
- struct vc4_bo *bo,
- unsigned stride,
- struct winsys_handle *whandle);
-struct vc4_bo *
-vc4_screen_bo_from_handle(struct pipe_screen *pscreen,
- struct winsys_handle *whandle);