pub unsafe extern "C" fn virgl_set_log_callback(
cb: virgl_log_callback_type,
user_data: *mut c_void,
free_user_data_cb: virgl_free_data_callback_type,
)pub unsafe extern "C" fn virgl_set_log_callback(
cb: virgl_log_callback_type,
user_data: *mut c_void,
free_user_data_cb: virgl_free_data_callback_type,
)