fix

while (running){
            frame(deltaTime);
            auto tick = Clock::now();
            deltaTime = std::chrono::duration_cast<FpSeconds>(tick - lastTick).count();
            // todo fix busy wait
            // https://forum.lazarus.freepascal.org/index.php?topic=35689.0
            while (deltaTime < timePerFrame){
                SDL_Delay((Uint32) ((timePerFrame - deltaTime) / 1000));
                tick = Clock::now();
                deltaTime = std::chrono::duration_cast<FpSeconds>(tick - lastTick).count();
            }
            lastTick = tick;
        }