Spécificités Unix

GFX_*/Linux

GFX_*/X

DIGI_*/Unix

MIDI_*/Unix

In order to locate things like the config and translation files, Allegro needs to know the path to your executable. Since there is no standard way to find that, it needs to capture a copy of your argv[] parameter, and it does this with some preprocessor macro trickery. Unfortunately it can't quite pull this off without a little bit of your help, so you will have to write END_OF_MAIN() right after your main() function. Pretty easy, really, and if you forget, you'll get a nice linker error about a missing _mangled_main function to remind you :-)

Drivers: GFX_*/Linux
When running in Linux console mode, Allegro supports the following card parameters for the set_gfx_mode() function:

• GFX_TEXT
  Return to text mode.

• GFX_AUTODETECT
  Let Allegro pick an appropriate graphics driver.

• GFX_SAFE
  Special driver for when you want to reliably set a graphics mode and don't really care what resolution. See the set_gfx_mode() documentation for details.

• GFX_FBCON
  Use the framebuffer device (eg. dev/fb0). This requires you to have framebuffer support compiled into your kernel, and correctly configured for your hardware. It is currently the only console mode driver that will work without root permissions.

• GFX_VBEAF
  Use a VBE/AF driver (vbeaf.drv), assuming that you have installed one which works under Linux (currently only two of the FreeBE/AF project drivers are capable of this: I don't know about the SciTech ones). VBE/AF requires root permissions, but is currently the only Linux driver which supports hardware accelerated graphics.

• GFX_GGI
  Use the GGI libraries for graphics output. This usually requires root permissions.

• GFX_SVGALIB
  Use the SVGAlib library for graphics output. This requires root permissions.

• GFX_VGA
  GFX_MODEX
  Use direct hardware access to set standard VGA or mode-X resolutions, supporting the same modes as in the DOS versions of these drivers. Requires root permissions.

• GFX_TEXT
  Return to text mode.

• GFX_AUTODETECT
  Let Allegro pick an appropriate graphics driver.

• GFX_SAFE
  Special driver for when you want to reliably set a graphics mode and don't really care what resolution. See the set_gfx_mode() documentation for details.

• GFX_XWINDOWS
  The standard X graphics driver. This should work on any Unix system, and can operate remotely. It does not require root permissions.

• GFX_XDGA
  Use the XFree86 DGA extension to write directly to the screen surface. DGA is normally much faster than the standard X mode, but does not produce such well behaved windowed programs, and will not work remotely. This driver requires root permissions.

• GFX_XDFS
  Like GFX_XDGA, but also changes the screen resolution so that it will run fullscreen. This driver requires root permissions.

      DIGI_AUTODETECT      - let Allegro pick a digital sound driver
      DIGI_NONE            - no digital sound
      DIGI_OSS             - Open Sound System
      DIGI_ESD             - Enlightened Sound Daemon
      DIGI_ALSA            - ALSA sound driver

      MIDI_AUTODETECT      - let Allegro pick a MIDI sound driver
      MIDI_NONE            - no MIDI sound
      MIDI_OSS             - Open Sound System
      MIDI_DIGMID          - sample-based software wavetable player

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