constexpr float c_updates_per_second = 30;
constexpr float c_update_delay = 1.0f / c_updates_per_second;
if(!paused) {
    time += delta;
}
while(time >= c_update_delay) {
    time -= c_update_delay;
    update();
}
float interp_dt = time / c_update_delay;
render(interp_dt);