gedeng/cpp/Application.cpp

#include "Gedeng/Application.h"
#include "Gedeng/Input.h"
#include "Gedeng/Logger.h"
#include "Gedeng/RenderBackend.h"
#include "Gedeng/Time.h"

namespace Gedeng {

Application::Application(unsigned long ms_per_update, unsigned int window_size_x, unsigned int window_size_y,
                         String window_name)
    : MS_PER_UPDATE(ms_per_update), WINDOW_SIZE_X(window_size_x), WINDOW_SIZE_Y(window_size_y),
      WINDOW_NAME(window_name) {
    // Setup Rendering
    RenderBackend::initialize_window(WINDOW_SIZE_X, WINDOW_SIZE_Y, WINDOW_NAME);
    Input::initialize(RenderBackend::get_window());
}

void Application::run() {
    unsigned long previous_time_ms = Time::get_time_ms();
    unsigned long time_until_fixed_update_ms = 0.0;

    while (!RenderBackend::does_window_want_to_close()) {
        unsigned long current_time_ms = Time::get_time_ms();
        unsigned long elapsed_time_ms = current_time_ms - previous_time_ms;

        previous_time_ms = current_time_ms;
        time_until_fixed_update_ms += elapsed_time_ms;

        Input::poll_input();

        // Update fixed time step
        while (time_until_fixed_update_ms >= MS_PER_UPDATE) {
            fixed_update(static_cast<double>(MS_PER_UPDATE) / 1000.0);
            time_until_fixed_update_ms -= MS_PER_UPDATE;
        }

        dynamic_update(static_cast<double>(elapsed_time_ms) / 1000.0);

        RenderBackend::render();
    }
}

} // namespace Gedeng