From: Sergi Marsal <smarsal AT abonados DOT cplus DOT es>
Newsgroups: comp.os.msdos.djgpp
Subject: Select gfx mode in allegro
Date: Wed, 18 Mar 1998 14:55:15 +0100
Organization: Unisource Espana NEWS SERVER
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To: djgpp AT delorie DOT com
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I have a very rare problem when compiling with Allegro 3.0

I can use some functions of allegro but cannot get'em working, it's very
strange,
other's programs work well, but if I make one it doesn't work! I mean
TEST.EXE from
allegro library in the TESTS directory it creates when I compile it
works correctly and
lets me choose the graphic mode and color depth.

I use RHIDE 1.4, Allegro library is linked, as I said above, I can use
some of the functions
but I have a problem with the graphic functions. I hope I am missing
something easy to fix.

I have a S3 Trio 64V+ with 2MB.

The more simple piece of code I could test it is:

------------------
#include "allegro.h"

void main(void)
{
  int mode, card, width, height, coldepth; // some variables to store
graphic parameters

  // initialise some allegro stuff
  allegro_init();
  // I don't know if these functions are important when setting the
video
  // mode but it doesn't work anyway if I don't put them
  // (perhaps I am missing something to initialise...)
  install_mouse();
  install_keyboard();
  install_timer();

  card=GFX_VGA; // I tried GFX_VGA, GFX_VESA1 and GFX_S3. No one works
for me
  width=320; // default width
  height=200; // default height
  coldepth=8; // color depth
  // set initial mode
  set_gfx_mode(card, width, height, 0, 0); // this works OK

  // ******* HANGS HERE!!! *********** (give me a SIGVABORT signal if I
break here)
  //mode=gfx_mode_select(&targeta, &amplada, &altura); // without color
depth
  mode=gfx_mode_select_ex(&card, &width, &height, &coldepth); // with
color depth
  // *********************************

  // exit
  allegro_exit();
}
------------------

any help will be most appreciated, thanx