[AL] prob with ALLEGRO_FULLSCREEN

[Frédéric D. <fd...@fr...>]

hello,

i begin with allegro 5 and it is the most beautifull library i know : like 
nithrill in the mines of Moria...

I use allegro 5.0.7 and i meet a problem with playing in FULLLSCREEN different 
kinds of drawings : the display is blurred a little like a very old TV and 
whatever the resolution. I link with allegro-5.0.7-monolith-mt-debug and 
allegro-5.0.7-monolith-mt

i work with cobeblock and Mingw32, windows 7, Dell XPS15 with a NVIDIA GeForce 
GT 420M video card.

May be i do some thing wrong ?  here is the code i test :

/*******************************************************************/
#include <allegro5/allegro.h>
#include <allegro5/allegro_native_dialog.h>
#include <allegro5/allegro_primitives.h>

void erreur(const char*txt)
{
     al_show_native_message_box( NULL, "Erreur", txt ,NULL, NULL, 0);
     exit(EXIT_FAILURE);
}

int main()
{
ALLEGRO_DISPLAY*display;
ALLEGRO_KEYBOARD_STATE key;
ALLEGRO_DISPLAY_MODE mode;

     if(!al_init())
         erreur("initialisation");

     if (!al_init_primitives_addon())
         erreur("init primitives");

     if(!al_install_keyboard())
         erreur("install keyboard");

    // to have destop résolution
     al_get_display_mode(al_get_num_display_modes()-1, &mode);

     // THE FULLSCREEN DOESN'T WORK PROPERLY
     al_set_new_display_flags(ALLEGRO_FULLSCREEN);

     display=al_create_display(mode.width,mode.height);
     if (!display)
         erreur("create_display");
     int scrx=al_get_display_width(display);
     int scry=al_get_display_height(display);


     do{

             al_get_keyboard_state(&key);

             int x1=rand()%scrx;
             int y1=rand()%scry;
             int x2=rand()%scrx;
             int y2=rand()%scry;

             ALLEGRO_COLOR color = 
al_map_rgba(rand()%255,rand()%255,rand()%255,rand()%255);
             float thickness = rand()%10 - 5;


             if (al_key_down(&key,ALLEGRO_KEY_F1))
                 al_draw_line(x1, y1, x2, y2, color, thickness);

             al_flip_display();


     }while (!al_key_down(&key,ALLEGRO_KEY_ESCAPE));

     al_destroy_display(display);
}