goop - squishy transparent oil and bubble screenhack

       Jamie Zawinski <jwz@jwz.org>, 11-Jun-97.

X Version 11                                   6.08 (10-Oct-2023)                                       goop(6x)

       Copyright  © 1997 by Jamie Zawinski.  Permission to use, copy, modify, distribute, and sell this software
       and its documentation for any purpose is hereby granted without fee, provided that  the  above  copyright
       notice  appear  in  all  copies  and that both that copyright notice and this permission notice appear in
       supporting documentation.  No representations are made about the suitability of  this  software  for  any
       purpose.  It is provided "as is" without express or implied warranty.

       The goop program draws a simulation of bubbles in layers of overlapping multicolored translucent fluid.

DISPLAY to get the default host and display number.

       XENVIRONMENT
               to get the  name  of  a  resource  file  that  overrides  the  global  resources  stored  in  the
               RESOURCE_MANAGER property.

       XSCREENSAVER_WINDOW
               The window ID to use with --root.

       goop - squishy transparent oil and bubble screenhack

goop accepts the following options:

       --window
               Draw on a newly-created window.  This is the default.

       --root  Draw on the root window.

       --window-idnumber
               Draw on the specified window.

       --mono  If on a color display, pretend we're on a monochrome display.

       --install
               Install a private colormap for the window.

       --visualvisual
               Specify  which  visual  to  use.   Legal  values are the name of a visual class, or the id number
               (decimal or hex) of a specific visual.

       --countinteger
               How many bubbles to draw per layer.  Default: random.

       --planesinteger
               How many planes to draw.  Default: random, based on screen depth.

       --delaymicroseconds
               How much of a delay should be introduced between steps of the animation.  Default 12000, or about
               0.012 seconds.

       --transparent
               If --layers is greater than 1, then each layer will be drawn in one color, and when they overlap,
               the colors will be mixed. This is the default.

       --non-transparent
               Turns off --transparent.

       --additive
               If --transparent is specified, then this option means that the colors  will  be  mixed  using  an
               additive color model, as if the blobs were projected light.  This is the default.

       --subtractive
               If  --transparent  is  specified,  then  this  option means that the colors will be mixed using a
               subtractive color model, as if the blobs were translucent filters.

       --xor   Draw with xor instead of the other color tricks.

       --fps   Display the current frame rate and CPU load.

X(1), xscreensaver(1)

goop  [--display  host:display.screen]  [--foreground  color]  [--background  color]  [--window] [--root]
       [--window-id  number][--mono]   [--install]   [--visual   visual]   [--transparent]   [--non-transparent]
       [--additive] [--subtractive] [--xor] [--no-xor] [--fps]