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WBkalReadMe
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1989-04-08
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WBKaleidoscope
Public Domain 1988 by Greg Searle
Isn't a plain blue Workbench background so BORING? Here is a solution.
This program will set up another playfield in back of your Workbench screen
and draw a slowly-changing pattern. Since the screen is dual-playfield,
the pattern does not disturb your Workbench at all--Workbench doesn't even
know it's there. The pattern is taken from my original Kaleidoscope demo.
To use this program, your Workbench screen must have a background color
(not black) - the original blue will work. The pattern uses four shades of
this color, from black up to the current screen color. This allows white
text to still stand out clearly. The program will automatically adjust for
changes in Workbench colors.
Stopping the program is simple - hit the close box in the "Kaleidoscope"
window bar. This removes the dual playfield completely, returning you to a
normal Workbench screen and freeing all memory used for the playfield (about
32K for a standard-size non-interlaced Workbench).
Note that, since four bitplanes are being displayed at high resolution,
the video chip is very loaded down and will steal time from the bus. The
resulting slowdown will especially be noticeable if you have no fast memory
installed (including a 1Meg A500). You can also see the load on the chip by
looking closely at the screen; you may notice off-color fringes in the
pattern or fringes around Workbench icons.
This program will work with any size Workbench screen, interlaced or
non-interlaced, overscan or standard. Compiled with Aztec C68000. There
are no known bugs, and the program exits cleanly. Of course, there are
dangers in using this program with any other program that alters the
Workbench screen. For example, attempting to use DropShadow will present
you with a blank screen -- the video chip refuses to process it. The only
way to fix this is to somehow stop either DropShadow or WBKaleidoscope, or
to reboot.