+#define TREE_FIRST_NODE(t) ((t) == TREE_TYPE_LEVEL_DIR ? \
+ leveldir_first : \
+ (t) == TREE_TYPE_GRAPHICS_DIR ? \
+ artwork.gfx_first : \
+ (t) == TREE_TYPE_SOUNDS_DIR ? \
+ artwork.snd_first : \
+ (t) == TREE_TYPE_MUSIC_DIR ? \
+ artwork.mus_first : \
+ NULL)
+