diff --git a/assets/fonts/Arial.ttf b/assets/fonts/Arial.ttf new file mode 100644 index 0000000..ab68fb1 Binary files /dev/null and b/assets/fonts/Arial.ttf differ diff --git a/assets/fonts/Arial_Bold.ttf b/assets/fonts/Arial_Bold.ttf new file mode 100644 index 0000000..940e255 Binary files /dev/null and b/assets/fonts/Arial_Bold.ttf differ diff --git a/assets/fonts/Arial_Bold_Italic.ttf b/assets/fonts/Arial_Bold_Italic.ttf new file mode 100644 index 0000000..52fd177 Binary files /dev/null and b/assets/fonts/Arial_Bold_Italic.ttf differ diff --git a/assets/fonts/Arial_Italic.ttf b/assets/fonts/Arial_Italic.ttf new file mode 100644 index 0000000..eac8b35 Binary files /dev/null and b/assets/fonts/Arial_Italic.ttf differ diff --git a/assets/sfml-icon-small.png b/assets/sfml-icon-small.png new file mode 100644 index 0000000..10aa70b Binary files /dev/null and b/assets/sfml-icon-small.png differ diff --git a/src/main.cpp b/src/main.cpp index 62c4782..a3eaa7f 100644 --- a/src/main.cpp +++ b/src/main.cpp @@ -1,12 +1,37 @@ -#include #include #include +#include #include -#include const int WINDOW_X = 600; const int WINDOW_Y = 800; +struct fps_counter { +public: + fps_counter(){ + if(!f.loadFromFile("../assets/fonts/Arial.ttf")){ + std::cout << "couldn't find the fallback Arial font " + "in ../assets/fonts/" << std::endl; + } else { + t.setFont(f); + } + } + void frame(double delta_time){ + frame_count++; + fps_average += (delta_time - fps_average) / frame_count; + } + void draw(sf::RenderWindow *r){ + t.setString(std::to_string(fps_average)); + r->draw(t); + } + +private: + sf::Font f; + sf::Text t; + int frame_count = 0; + double fps_average = 0; +}; + float elap_time(){ static std::chrono::time_point start; static bool started = false; @@ -22,39 +47,70 @@ float elap_time(){ } int main() { - elap_time(); - std::mt19937 rng(time(NULL)); - std::uniform_int_distribution rgen(100, 400); - + // Initialize the render window sf::RenderWindow window(sf::VideoMode(WINDOW_X, WINDOW_Y), "SFML"); - float step_size = 0.005f; - double frame_time = 0.0, elapsed_time = 0.0, delta_time = 0.0, accumulator_time = 0.0, current_time = 0.0; + // The step size in milliseconds between calls to Update() + // Lets set it to 16.6 milliseonds (60FPS) + float step_size = 0.0166f; + + // Timekeeping values for the loop + double frame_time = 0.0, + elapsed_time = 0.0, + delta_time = 0.0, + accumulator_time = 0.0, + current_time = 0.0; + fps_counter fps; while (window.isOpen()) { + // Poll for events from the user sf::Event event; while (window.pollEvent(event)) { + + // If the user tries to exit the application via the GUI if (event.type == sf::Event::Closed) window.close(); } + // Get the elapsed time from the start of the application elapsed_time = elap_time(); + + // Find the time that passed between now and the last frame delta_time = elapsed_time - current_time; + + // Set the time for the next frame to use current_time = elapsed_time; - if (delta_time > 0.02f) - delta_time = 0.02f; + + // If the time between the last frame and now was too large (lag) + // cull the time to a more acceptable value. So instead of jumping large + // amounts when lagging, the app only jumps in set increments + if (delta_time > 0.05f) + delta_time = 0.05f; + + // Add the frame time to the accumulator, a running total of time we + // need to account for in the application accumulator_time += delta_time; + // While we have time to step while ((accumulator_time - step_size) >= step_size) { + + // Take away a step from the accumulator accumulator_time -= step_size; + // And update the application for the amount of time alotted for one step // Update(step_size); } + + // Rendering code goes here window.clear(sf::Color::Black); + // Give the frame counter the frame time and draw the average frame time + fps.frame(delta_time); + fps.draw(&window); + window.display();