+#define HAS_CHILD_PROCESS() (audio.mixer_pid > 0)
+#else
+#define IS_PARENT_PROCESS() TRUE
+#define IS_CHILD_PROCESS() FALSE
+#define HAS_CHILD_PROCESS() FALSE
+#endif
+
+
+/* values for artwork type */
+#define ARTWORK_TYPE_GRAPHICS 0
+#define ARTWORK_TYPE_SOUNDS 1
+#define ARTWORK_TYPE_MUSIC 2
+
+#define NUM_ARTWORK_TYPES 3
+
+
+/* values for tree type (chosen to match artwork type) */
+#define TREE_TYPE_UNDEFINED -1
+#define TREE_TYPE_GRAPHICS_DIR ARTWORK_TYPE_GRAPHICS
+#define TREE_TYPE_SOUNDS_DIR ARTWORK_TYPE_SOUNDS
+#define TREE_TYPE_MUSIC_DIR ARTWORK_TYPE_MUSIC
+#define TREE_TYPE_LEVEL_DIR 3
+#define TREE_TYPE_LEVEL_NR 4
+
+#define NUM_TREE_TYPES 5
+
+#define INFOTEXT_UNDEFINED ""
+#define INFOTEXT_GRAPHICS_DIR "Custom Graphics"
+#define INFOTEXT_SOUNDS_DIR "Custom Sounds"
+#define INFOTEXT_MUSIC_DIR "Custom Music"
+#define INFOTEXT_LEVEL_DIR "Level Sets"
+#define INFOTEXT_LEVEL_NR "Levels"
+
+#define TREE_INFOTEXT(t) ((t) == TREE_TYPE_LEVEL_NR ? \
+ INFOTEXT_LEVEL_NR : \
+ (t) == TREE_TYPE_LEVEL_DIR ? \
+ INFOTEXT_LEVEL_DIR : \
+ (t) == TREE_TYPE_GRAPHICS_DIR ? \
+ INFOTEXT_GRAPHICS_DIR : \
+ (t) == TREE_TYPE_SOUNDS_DIR ? \
+ INFOTEXT_SOUNDS_DIR : \
+ (t) == TREE_TYPE_MUSIC_DIR ? \
+ INFOTEXT_MUSIC_DIR : \
+ INFOTEXT_UNDEFINED)
+
+/* values for artwork handling */
+#define LEVELDIR_ARTWORK_SET_PTR(leveldir, type) \
+ ((type) == ARTWORK_TYPE_GRAPHICS ? \
+ &(leveldir)->graphics_set : \
+ (type) == ARTWORK_TYPE_SOUNDS ? \
+ &(leveldir)->sounds_set : \
+ &(leveldir)->music_set)
+
+#define LEVELDIR_ARTWORK_SET(leveldir, type) \
+ ((type) == ARTWORK_TYPE_GRAPHICS ? \
+ (leveldir)->graphics_set : \
+ (type) == ARTWORK_TYPE_SOUNDS ? \
+ (leveldir)->sounds_set : \
+ (leveldir)->music_set)
+
+#define LEVELDIR_ARTWORK_PATH_PTR(leveldir, type) \
+ ((type) == ARTWORK_TYPE_GRAPHICS ? \
+ &(leveldir)->graphics_path : \
+ (type) == ARTWORK_TYPE_SOUNDS ? \
+ &(leveldir)->sounds_path : \
+ &(leveldir)->music_path)
+
+#define LEVELDIR_ARTWORK_PATH(leveldir, type) \
+ ((type) == ARTWORK_TYPE_GRAPHICS ? \
+ (leveldir)->graphics_path : \
+ (type) == ARTWORK_TYPE_SOUNDS ? \
+ (leveldir)->sounds_path : \
+ (leveldir)->music_path)
+
+#define SETUP_ARTWORK_SET(setup, type) \
+ ((type) == ARTWORK_TYPE_GRAPHICS ? \
+ (setup).graphics_set : \
+ (type) == ARTWORK_TYPE_SOUNDS ? \
+ (setup).sounds_set : \
+ (setup).music_set)
+
+#define SETUP_OVERRIDE_ARTWORK(setup, type) \
+ ((type) == ARTWORK_TYPE_GRAPHICS ? \
+ (setup).override_level_graphics : \
+ (type) == ARTWORK_TYPE_SOUNDS ? \
+ (setup).override_level_sounds : \
+ (setup).override_level_music)
+
+#define GFX_OVERRIDE_ARTWORK(type) \
+ ((type) == ARTWORK_TYPE_GRAPHICS ? \
+ gfx.override_level_graphics : \
+ (type) == ARTWORK_TYPE_SOUNDS ? \
+ gfx.override_level_sounds : \
+ gfx.override_level_music)
+
+#define ARTWORK_FIRST_NODE(artwork, type) \
+ ((type) == ARTWORK_TYPE_GRAPHICS ? \
+ (artwork).gfx_first : \
+ (type) == ARTWORK_TYPE_SOUNDS ? \
+ (artwork).snd_first : \
+ (artwork).mus_first)
+
+#define ARTWORK_CURRENT_IDENTIFIER_PTR(artwork, type) \
+ ((type) == ARTWORK_TYPE_GRAPHICS ? \
+ &(artwork).gfx_current_identifier : \
+ (type) == ARTWORK_TYPE_SOUNDS ? \
+ &(artwork).snd_current_identifier : \
+ &(artwork).mus_current_identifier)
+
+#define ARTWORK_CURRENT_IDENTIFIER(artwork, type) \
+ ((type) == ARTWORK_TYPE_GRAPHICS ? \
+ (artwork).gfx_current_identifier : \
+ (type) == ARTWORK_TYPE_SOUNDS ? \
+ (artwork).snd_current_identifier : \
+ (artwork).mus_current_identifier)
+
+#define ARTWORKINFO_FILENAME(type) \
+ ((type) == ARTWORK_TYPE_GRAPHICS ? \
+ GRAPHICSINFO_FILENAME : \
+ (type) == ARTWORK_TYPE_SOUNDS ? \
+ SOUNDSINFO_FILENAME : \
+ (type) == ARTWORK_TYPE_MUSIC ? \
+ MUSICINFO_FILENAME : "")
+
+#define ARTWORK_DIRECTORY(type) \
+ ((type) == ARTWORK_TYPE_GRAPHICS ? \
+ GRAPHICS_DIRECTORY : \
+ (type) == ARTWORK_TYPE_SOUNDS ? \
+ SOUNDS_DIRECTORY : \
+ (type) == ARTWORK_TYPE_MUSIC ? \
+ MUSIC_DIRECTORY : "")
+
+#define OPTIONS_ARTWORK_DIRECTORY(type) \
+ ((type) == ARTWORK_TYPE_GRAPHICS ? \
+ options.graphics_directory : \
+ (type) == ARTWORK_TYPE_SOUNDS ? \
+ options.sounds_directory : \
+ (type) == ARTWORK_TYPE_MUSIC ? \
+ options.music_directory : "")
+
+#define UPDATE_BUSY_STATE() \
+{ \
+ if (gfx.draw_busy_anim_function != NULL) \
+ gfx.draw_busy_anim_function(); \
+}