From: "Chris Frolik" <spam AT dev DOT null DOT com>
Newsgroups: comp.os.msdos.djgpp
Subject: Re: Newbie
Date: Thu, 4 Feb 1999 18:17:47 -0500
Organization: Purdue University
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>      dat = load_datafile("spill.dat");
>      if (!dat) {
>  return;    }

Yout should load the datafile _after_ calling set_color_depth() and
set_gfx_mode().  Otherwise, Allegro will not know what format to convert the
loaded images into.

>   allegro_init();


allegro_init() should be the first function you call, even before
load_datafile().

>   set_color_depth(16);
>   set_gfx_mode(GFX_AUTODETECT, 800, 600, 0, 0);

It's a good idea to check the return value of set_gfx_mode() here to ensure
that the resolution was set correctly.

>
>   set_palette(dat[palette001].dat);

set_palette() has no meaning in 15-bit modes and above... I'm not sure if
it's a bad thing to call it anyways?  To be safe, you should only call
set_palette() if you are using an 8-bit color depth.

>   destroy_bitmap(bmp);

This is not what you want.  bmp was loaded with the datafile, so you should
call destroy_datafile(dat) instead.