anchor.diff:  
      (glEnd)
   
  -   (list time))))+   (list time))))
  +
  +(gl:finish)
  
positive.code:          (setx! glows x y 0)))))))
  
  
  (gl:run
  
     "Digital Rain"
  
  ; init
  (lambda ()
     (glShadeModel GL_SMOOTH)
     (glClearColor 0 0 0 1.0)
  
  
negative.code:    (glMatrixMode GL_MODELVIEW)
     (glLoadIdentity)
  
  (gl:set-userdata
     (let* ((time _ (clock)))
        (list time)))
  
  ; draw
  (gl:set-renderer
  (lambda (oldtime)
     (let* ((time _ (clock)))
  
  