example for bug report

main.d

import std.stdio;

import Dgame.Window;
import Dgame.Graphic;
import Dgame.System.StopWatch;
import Dgame.System.Font;
import Dgame.System.Keyboard;


interface Entity {
    void update(ref Window window);
}


class Player : Entity {
    int x;
    int y;
    int speed = 1;
    
    Sprite player_sprite;

    this(int x, int y) {
        this.x = x;
        this.y = y;

        Surface player_img = Surface("assets/textures/player.png");
        Texture player_texture = Texture(player_img);
        
        this.player_sprite = new Sprite(player_texture);
        this.player_sprite.setPosition(this.x, this.y);
    }

    void update(ref Window window) {
        window.draw(this.player_sprite);
    }
}


void main() {
    Window wnd = Window(640, 480, "Dgame Test", Window.Style.OpenGL | Window.Style.Shown);
    wnd.setClearColor(Color4b.Green);
    wnd.clear();

    StopWatch clock;
    Font fnt = Font("assets/fonts/Helvetica.ttf", 22);
    Text curFps = new Text(fnt);
    curFps.setPosition(0, 0);

    Player player = new Player(200, 10);

    Surface enemy_img = Surface("assets/textures/enemy.png");
    Texture enemy_texture = Texture(enemy_img);

    Sprite enemy_sprite = new Sprite(enemy_texture);
    enemy_sprite.setPosition(30, 50);

    bool running = true;

    Event event;
    while (running) {
        wnd.clear();
        
        while (wnd.poll(&event)) {
            switch (event.type) {
                case Event.Type.Quit:
                    writeln("Quit Event");
                    running = false;
                break;
                    
                default: break;
            }
        }

        player.update(wnd);
        wnd.draw(enemy_sprite);

        curFps.format("Current FPS: %d.", clock.getCurrentFPS());
        wnd.draw(curFps);

        wnd.display();
    }
}