}
+/* jwz -- this doesn't really work very well.
+
+ All I want to do is give the tank a gradient-filled background, instead
+ of just solid blue. The following was my guess as to how to do this,
+ but it kills my frame rate. I guess there's a more efficient way to do
+ this, but I don't see it...
+
+ I mean, all I want to do is dump some non-projected bytes into the color
+ buffer, then zero out the depth buffer. That *can't* be expensive, can
+ it?
+ */
static void
clear_tank (atlantisstruct * ap)
{