function normal   (shader, t_base, t_second, t_detail)
      shader:begin  ("parallax_mark", "parallax_mark")
      : fog       (true)
      : zb        (true,false)
      : blend     (true,blend.srcalpha,blend.one)
      : aref      (true,0)
      : sorting   (2,true)
      : distort   (true)
    shader:dx10texture("s_base", t_base)
    shader:dx10sampler("smp_rtlinear")
end
