Урок 2. Вывод текста. Allegro

Исходный код:
#include <allegro5\allegro.h>

#include <allegro5\allegro_font.h>
#include <allegro5\allegro_ttf.h>
#include <allegro5\allegro_native_dialog.h>

int main(void)
{
 ALLEGRO_DISPLAY *display = NULL;

 if(!al_init()) 
 {
  al_show_native_message_box(NULL, NULL, NULL, 
   "failed to initialize allegro!", NULL, NULL);                   
  return -1;
 }

 display = al_create_display(640, 480);

 if(!display) 
 {
  al_show_native_message_box(NULL, NULL, NULL, 
   "failed to initialize display!", NULL, NULL);
  return -1;
 }

 al_init_font_addon();
 al_init_ttf_addon();

 ALLEGRO_FONT *font24 = al_load_font("arial.ttf", 24, 0);
 ALLEGRO_FONT *font36 = al_load_font("arial.ttf", 36, 0);
 ALLEGRO_FONT *font18 = al_load_font("arial.ttf", 18, 0);

 al_clear_to_color(al_map_rgb(0,0,0));

 al_draw_text(font24, al_map_rgb(255, 0, 255), 50, 50, 0, "Hello World, this is 24 point");
 al_draw_text(font36, al_map_rgb(255, 127, 127), 640 / 2, 480 / 2, ALLEGRO_ALIGN_CENTRE, "This is Centered and 36 point");
 al_draw_text(font18, al_map_rgb(15, 240, 18), 620, 350, ALLEGRO_ALIGN_RIGHT, "This is right aligned and 18 point");

 int screen_w = al_get_display_width(display);
 int screen_h = al_get_display_height(display);

 al_draw_textf(font18, al_map_rgb(255, 255, 255), screen_w/2, 400, ALLEGRO_ALIGN_CENTRE,
  "TEXT with variable output (textf): Screen width and height = %i / %i" , screen_w, screen_h);

 al_flip_display();

 al_rest(5.0);

 al_destroy_font(font18);
 al_destroy_font(font24);
 al_destroy_font(font36);
 al_destroy_display(display);
 
 return 0;
}