From: Damian Yerrick <DONT DOT YOU DOT DAREd_yerrick AT hotmail DOT comSEND DOT SPAM>
Newsgroups: comp.os.msdos.djgpp
Subject: Re: allegro and StdVGA 640x480x16, how ?
Organization: Pin Eight Software  http://pineight.8m.com/
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NNTP-Posting-Date: Fri, 03 Mar 2000 05:12:03 GMT
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Date: Fri, 03 Mar 2000 05:12:03 GMT
To: djgpp AT delorie DOT com
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Reply-To: djgpp AT delorie DOT com

On Thu, 2 Mar 2000 15:26:43 +0100, "Tihomir Heidelberg"
<9a4gl AT 9a0tcp DOT ampr DOT org> wrote:

>Is it possible to use 640x480 16 color graphic resolution with
>standard VGA driver (not VESA) with Allegro ?

No.  Allegro works only in packed-pixel modes, namely 8-bit,
15/16-bit, 24-bit, and 32-bit modes.  Sixteen-color mode is
four overlayed monochrome bitmaps; you may need to delve into
GRX or write your own library.  Look for EGA graphics manuals
for more information, as 16-color works exactly as on EGA.

>It seems that it works up to 320x200 with standard VGA driver.

BTW, have you tried mode X in 320x400?  Looks cool.
You can even show an authentic Windows 9x splash screen:

void Show9xBoot(void)
{
  PALETTE pal;
  BITMAP *bmp = load_bitmap("c:\logo.sys", pal);

  if(bmp == NULL)
    return;
  set_palette(pal);
  blit(bmp, screen, 0, 0, 0, 0, 320, 400);
  destroy_bitmap(bmp);
}

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