Unix specifics

DIGI_*/Unix
GFX_*/Linux
GFX_*/X
MIDI_*/Unix
xwin_set_window_name

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_AUTODETECT_FULLSCREEN
Autodetects a graphics driver, but will only use fullscreen drivers, failing if these are not available on current platform.
GFX_AUTODETECT_WINDOWED
Same as above, but uses only windowed drivers. This will always fail under Linux console mode.
GFX_SAFE
Special driver for when you want to reliably set a graphics mode and don't really care what resolution or color depth you get. 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, unless you are using a development version of SVGAlib.
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_SVGALIB
Use the SVGAlib library for graphics output. This requires root permissions if your version of SVGAlib requires them.
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.

See also: set_gfx_mode, GFX_*/X.

Drivers GFX_*/X

When running in X mode, Allegro supports the following card parameters for the set_gfx_mode() function:

GFX_TEXT
This closes any graphic mode previously opened with set_gfx_mode.
GFX_AUTODETECT
Let Allegro pick an appropriate graphics driver.
GFX_AUTODETECT_FULLSCREEN
Autodetects a graphics driver, but will only use fullscreen drivers, failing if these are not available on current platform.
GFX_AUTODETECT_WINDOWED
Same as above, but uses only windowed drivers.
GFX_SAFE
Special driver for when you want to reliably set a graphics mode and don't really care what resolution or color depth you get. 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_XWINDOWS_FULLSCREEN
The same as above, but while GFX_XWINDOWS runs windowed, this one uses the XF86VidMode extension to make it run in fullscreen mode even without root permissions. You're still using the standard X protocol though, so expect the same low performances as with the windowed driver version.
GFX_XDGA
Use the XFree86 DGA 1.0 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_XDGA_FULLSCREEN
Like GFX_XDGA, but also changes the screen resolution so that it will run fullscreen. This driver requires root permissions.
GFX_XDGA2
Use new DGA 2.0 extension provided by XFree86 4.0.x. This will work in fullscreen mode, and it will support hardware acceleration if available. This driver requires root permissions.
GFX_XDGA2_SOFT
The same as GFX_XDGA2, but turns off hardware acceleration support. This driver requires root permissions.

See also: set_gfx_mode, GFX_*/Linux.

Drivers DIGI_*/Unix

The Unix sound functions support the following digital soundcards:

      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

See also: detect_digi_driver, install_sound, install_sound_input.

Drivers MIDI_*/Unix

The Unix sound functions support the following MIDI soundcards:

      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
      MIDI_ALSA            - ALSA RawMIDI driver

See also: detect_midi_driver, install_sound, install_sound_input.

void xwin_set_window_name(const char *name, const char *group);

This function is only available under X. It lets you to specify the window name and group (or class). They are important because they allow the window manager to remember the window attributes (position, layer, etc). Note that the name and the title of the window are two different things: the title is what appears in the title bar of the window, but usually has no other effects on the behaviour of the application.

See also: set_window_title.

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