clock.cc

#include "clock.hh"
#include <thread>


namespace SDL {
    Clock::Clock() {
        last = std::chrono::system_clock::now();
        first = true;
    }

    std::chrono::milliseconds Clock::tick() {
        const auto current = std::chrono::system_clock::now();
        std::chrono::milliseconds delta = std::chrono::duration_cast<std::chrono::milliseconds>(
                current - this->last
        );
        this->last = current;
        return delta;
    }

    std::chrono::milliseconds Clock::tick(const float fps) {
        const auto delta = this->tick();
        const auto min_delta = std::chrono::duration<double>(1.0 / double(fps));
        const auto delta_delta = delta - min_delta;
        if (delta_delta > std::chrono::duration<double>(0.)) {
            std::this_thread::sleep_for(delta_delta);
            return std::chrono::duration_cast<std::chrono::milliseconds>(min_delta);
        } else {
            return delta;
        }
    }
}