gameHandler

  s S h xxxx d
  | | | |||| +-- day/night flag
  | | | ||||     0 = day
  | | | ||||     1 = night
  | | | ++++---- (unused)
  | | +--------- draw hud flag
  | |            0 = draw hud
  | |            1 = don't draw hud
  | +----------- draw sprite flag
  |              0 = draw sprites
  |              1 = don't draw sprites
  +------------- render screen flag
                 0 = no new screen will be / is being rendered
                 1 = new screen will be / is being rendered