+static int init(void);
+static void destroy(void);
+static void start(long trans_time);
+static void stop(long trans_time);
+static void draw(void);
+
+static void (*draw_tunnel_range)(void*, int, int, int, int, long);
+
+static void draw_tunnel_range16(void *pixels, int xoffs, int yoffs, int starty, int num_lines, long tm);
+static void draw_tunnel_range32(void *pixels, int xoffs, int yoffs, int starty, int num_lines, long tm);