Sprite loading problem

no-reply@allegro.cc (auliszek) — Thu, 19 May 2011 12:02:13 +0000

I was searching for the answer in many places but nobody could help me yet. like this:

#SelectExpand
  1al_init(); 
  2  ALLEGRO_DISPLAY *display = al_create_display(640, 480);
  3  al_set_window_title(display, "Allegro 5");
  4  al_clear_to_color(al_map_rgba(0, 0, 0, 255));
  5  // koniec inicjalizacji okna - jest ok.  
  6
  7  if(!al_init_image_addon())
  8    return -1;
  9
 10  if(!al_filename_exists("D:/C++/Allegro_drawing/Allegro_drawing/sprite.bmp"))
 11    return -4;
 12
 13  if(!al_is_system_installed())
 14    return -5;
 15
 16   ALLEGRO_BITMAP *img = al_load_bitmap("sprite.bmp");
 17  if(!img)
 18    return -2;

Sprite is in the internal directory named like the project (as you can see). It always ends returning -2. I included needed header files.
So what could possibly go wrong?

no-reply@allegro.cc (weapon_S) — Thu, 19 May 2011 12:15:57 +0000

"D:/C++/Allegro_drawing/Allegro_drawing/sprite.bmp" != "sprite.bmp"
What's your operating system?

no-reply@allegro.cc (auliszek) — Thu, 19 May 2011 12:29:12 +0000

Windows xp home

It is not equal in theory, but it is also the directory where main.cpp is. When i load font this way it works.

no-reply@allegro.cc (Edgar Reynaldo) — Thu, 19 May 2011 12:41:31 +0000

If you use a relative path like sprite.bmp, then you have to run the program from the same directory as sprite.bmp, or the same directory as your program, if they're the same.

no-reply@allegro.cc (torhu) — Thu, 19 May 2011 12:54:52 +0000

You can set the current directory to where the executable is like this, if that's where your data is:

ALLEGRO_PATH appdir = al_get_standard_path(ALLEGRO_RESOURCES_PATH, ALLEGRO_NATIVE_PATH_SEP);
if (!appdir)
    return -6;
if (!al_change_directory(al_path_cstr(appdir)))
    return -7;
al_destroy_path(appdir);

If that doesn't work, maybe the BMP file is an a weird format?

no-reply@allegro.cc (auliszek) — Thu, 19 May 2011 13:11:16 +0000

But when i do sth like:
al_load_bitmap("D:/C++/Allegro_drawing/Allegro_drawing/sprite.bmp");
it also doesn't load my sprite. Why is that? Its not a relative path then.

no-reply@allegro.cc (LennyLen) — Thu, 19 May 2011 13:32:38 +0000

As Torhu mentioned, the BMP file could be in a wrong format. Try loading/saving it with MS Paint, and see if the problem persists.

no-reply@allegro.cc (auliszek) — Thu, 19 May 2011 13:55:52 +0000

Yeah, this totally worked
Thx, but one more question - if for example i'm using photoshop to edit pictures, with what parameters i should save them with?

no-reply@allegro.cc (Audric) — Thu, 19 May 2011 14:10:11 +0000

According to this thread, somebody had similar problem with a 32bit BMP, 24bit was fine.
If you can provide a sample non-loading bitmap, Allegro coders can have a look at what's the problem with such images.

(edit: From looking at the source, the load routine will only accept some very specific R G B bitmasks... for 32bit, only ARGB order is accepted.)

no-reply@allegro.cc (Arthur Kalliokoski) — Thu, 19 May 2011 14:11:55 +0000

Photoshop should be able to save to .png or possibly .tga.

no-reply@allegro.cc (auliszek) — Thu, 19 May 2011 14:16:55 +0000

Thanks guyz