[AD] Bug when attempting to set GFX_AUTODETECT

[AD] Bug when attempting to set GFX_AUTODETECT_WINDOWED in the DOS version of Allegro.

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To: "Allegro Conductors [AD]" <Alleg-developers@xxxxxxxxxx>
Subject: [AD] Bug when attempting to set GFX_AUTODETECT_WINDOWED in the DOS version of Allegro.
From: Andrei Ellman <ae-a-alleg@xxxxxxxxxx>
Date: Thu, 27 Apr 2006 22:22:06 +0200
Organization: Wacko Software

When I run the following line from a program compiled with the DOSversion of Allegro 4.2 (compiled with DJGPP):

set_gfx_mode(GFX_AUTODETECT_WINDOWED, 640, 480, 0, 0);the program has been known to crash with a SIGILL error (illegalinstruction). My guess is that because on DOS there are no windowedmodes, the pointer in some vtable or other is set to a dodgy address.

If there are no windowed modes available on the platform, then theset_gfx_mode function should just return gracefully with it's usualfailiure-code.

AE.

Follow-Ups:
- Re: [AD] Bug when attempting to set GFX_AUTODETECT_WINDOWED in the DOS version of Allegro.
  - From: Trent Gamblin
- Re: [AD] Bug when attempting to set GFX_AUTODETECT_WINDOWED in the DOS version of Allegro.
  - From: Michal Molhanec

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