flikkering bitmaps

flikkering bitmaps

felixh

Member #8,226

January 2007

Hello,
I'm a beginner in programming C and a totally beginner in programming allegro.
My problem is, when i want to render 2 bitmaps, the second seems to 'flikker'.
in one Frame it is Rendered, in the next it isn't rendered, then it is rendered again...
My code:

1void mainmenu()  {
 arrow = load_pcx("pic//arrow.pcx", palette);
 BG_main = load_pcx("pic//menu//BG_main.pcx", palette);
 newgame = load_tga("pic//menu//neuesspiel.tga", palette);
 newgame_ = load_tga("pic//menu//neuesspiel_.tga", palette);
 
 set_alpha_blender();
 //set_write_alpha_blender();
 
 while(!key[KEY_ESC]) 
 {
              draw_sprite(screen, BG_main, 0, 0); // hintergrund
              
              if ((mouse_x > 350 && mouse_x < 650)&&(mouse_y > 100 && mouse_y < 200))
              {
                       draw_trans_sprite(screen, newgame_, 350, 100);  }
            else { draw_trans_sprite(screen, newgame, 350, 100); }
               
              show_mouse(screen);
   }
21}

I tried to youse the GUI, but i don't understand it.

ps: sorry for my bad English

Archon

Member #4,195

January 2004

Look for tutorials that explain 'double buffering', it is the solution to your problem.

Kauhiz

Member #4,798

July 2004

Well, you shouldn't blit directly to the screen. Blit everything to another bitmap, then blit that bitmap to the screen. It's called double buffering, if you want to search for examples or something.

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It's Ridge Racer! RIIIIIDGE RAAAAACER!

felixh

Member #8,226

January 2007

THX!!!