Read data from host-visible ssbo

        //Object to map data into
        ssbo_object_picking p;

        //map gpu memory into data
        void* data;
        vkMapMemory(device, buffer_memory, 0, sizeof(ssbo_object_picking), 0, &data);

        //copy from data into p
        memcpy(&p, data, sizeof(ssbo_object_picking));

        //unmap gpu memory
        vkUnmapMemory(device, buffer_memory);