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General discussions / Is better sf::sleep(sf::milliseconds()); or window.setFramelimit(); ?

« on: April 06, 2024, 08:31:45 pm »

Hello everyone, I'm trying to understand delta time once again, and with this code:

#include <chrono>
#include <SFML/Graphics.hpp>


int main() {

    constexpr unsigned char MAX_FPS = 60;

    constexpr std::chrono::microseconds FRAME_DURATION(1000000 / MAX_FPS);
        std::chrono::steady_clock::time_point previous_time;
        std::chrono::microseconds lag(0);

        sf::Event event;

        sf::RenderWindow window(sf::VideoMode(500, 500), "SFML", sf::Style::Close);
    //window.setFramerateLimit(MAX_FPS);

        previous_time = std::chrono::steady_clock::now();

        while (window.isOpen()) {

                std::chrono::microseconds dt = std::chrono::duration_cast<std::chrono::microseconds>(std::chrono::steady_clock::now() - previous_time);

                lag += dt;

                previous_time += dt;

                while (FRAME_DURATION <= lag) {

                        lag -= FRAME_DURATION;

                        while (window.pollEvent(event)) {
                                switch (event.type) {

                                        case sf::Event::Closed: {
                                                window.close();

                                                break;
                                        }
                                }
                        }



                        if (FRAME_DURATION > lag) {

                                window.clear();

                                window.display();

                //sf::sleep(sf::milliseconds(50));
                        }
                }
        }
}
 

Is better to use sleep or setFramelimit? what are the differences in this case? Btw when I use none of them, my cpu usage is high.

2

General discussions / Is deltaTime precise?

« on: November 27, 2023, 01:25:58 pm »

I'm trying to create Super Mario Bros but I think there is something wrong with deltaTime
When I change the FPS_LIMIT to 20, Mario goes higher than normal (like 20px more).
Can someone explain?
This is the code: