BIG DOG
=======
A winged bulldog, flying through pipes, drawn straight into /dev/fb0.

Launch this machine, then in the terminal pane:

    tclsh /home/bigdog.tcl

Click the terminal pane so it has focus, then SPACE to flap, Q to quit.
Watch the framebuffer pane (you can fullscreen it).

Optional: tclsh /home/bigdog.tcl <width> <height>   (default 320x240)
The playfield is drawn into the top-left of the display; the stride is read
from /sys/class/graphics/fb0/stride.