================================================    Updated:
Environment variables affecting LibGGI behaviour    990514
================================================    


DISPLAY- If set, assumes you want to use the X target. Can be
  overriden by the GGI_DISPLAY variable.

GGI_DISPLAY- Target to use when ggiOpen() is called with a NULL argument.

  Format: <target>[:<targetargs>]

  A list of targets with descriptions can be found in the
  targets.txt file.
  If neither this or DISPLAY is set targets are tried in the
  following order: fbdev, svga, aa

GGI_INPUT_<targetname>
- Specify extra input sources and/or filters for visuals
  using <targetname>.

  Format: <input>[:<inputargs>]
  
  Multiple inputs can be specified using the notation:
  (<i1>):(<i2>):(<i3>) etc...

GGI_INPUT- Specify extra input sources and/or filters for all other
  visuals.
  Same format as above.

GGI_DEFMODE- The default mode for LibGGI to use. When GGI_AUTO or GT_AUTO
  are specified in a mode setting call they will be replaced
  with values from GGI_DEFMODE before calling the target's
  setmode function.
  
  Format: size virt dpp frames graphtype
  
  size = ['S'] X 'x' Y [ 'x' depth ]
  virt = 'V' X 'x' Y    
  dpp  = 'D' X 'x' Y  
  frames = 'F' frames
  graphtype = '[' scheme depth '/' size ']'  |  scheme depth
  scheme = 'C' | 'P' | 'K' | 'T'

  All parameters can be specified in any order. Anything and
  Everything (!) can be omitted, all ommitted values default
  to GGI_AUTO (and GT_AUTO for the graphtype). Whitespace and
  '.' symbols ignored.  Case insensitive.

  Examples include:
   640x480    just a visible size
   640x480V640x960  same size, but double-height virtual screen
   V1024x768        only virtual size defined
   80x40[T]    (default-bitsized) text mode with 80x40
      characters
   Vx100[T]    text mode with 100 virtual lines
   640x400[8]    640x400 at 8 bits per pixel
   640x400[GT_8BIT] same as above, but palettized
   320x200x15    320x200 with 32768 colors
   320x200[C15]    320x200 with 32768 colors (hicolor)
   320x200[C/16]    320x200 with 16 bit pixels (also hicolor)
   320x200[C24/32]  320x200, 32 bit pixels, 16777216 colors
      (truecolor)
   320x200[GT_32BIT] same as above

GGI_DEBUG- Debug level for LibGGI:
                    0 or unset - debug output is offdebugging is off
    255        - all debug output is on
  You may also 'or' any of the following together:
      2  - debug core
      4  - debug mode setting
      8  - debug color handling
     16  - debug drawing
     32  - misc debugging output
     64 - debug dynamic library handling
    128  - debug event handling

GGI_DEBUGSYNC- Turn on synchronous debug output. Flush the output buffers
  before returning from GGIDPRINT calls.

FRAMEBUFFER- Specifies which device file the fbdev target should use.

GGI_NEWVT- Will cause a new VT to be allocated for some Linux-console
  based targets (currently fbdev and glide).

GGI_MANSYNC_FPS - Specify the framerate for targets using mansync to do
  SYNC mode. The default is 20fps.
  If you are experiencing problems with the X target over
  relatively slow remote connections it might be due to
  connection overload. You might want to try with a lower
  GGI_MANSYNC_FPS setting.


GGI_FBDEV_OPTIONS, GGI_FILE_OPTIONS, GGI_GLIDE_MAXFREQ, GGI_GLIDE_MAXHFREQ,
GGI_GLIDE_HALTONSWITCH, GGI_PALEMU_OPTIONS, and GGI_TRUEEMU_OPTIONS are target
specific environment variables. See the file targets.txt for descriptions of
those.