+/* macros for parent/child process identification */
+#if defined(PLATFORM_UNIX)
+#define IS_PARENT_PROCESS() (audio.mixer_pid != getpid())
+#define IS_CHILD_PROCESS() (audio.mixer_pid == getpid())
+#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 NUM_TREE_TYPES 4
+
+
+/* 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 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 : "")