+/* default name for empty highscore entry */
+#define EMPTY_PLAYER_NAME "no name"
+
+/* default name for unknown player names */
+#define ANONYMOUS_NAME "anonymous"
+
+/* default name for new levels */
+#define NAMELESS_LEVEL_NAME "nameless level"
+
+/* default text for non-existant artwork */
+#define NOT_AVAILABLE "(not available)"
+
+/* default value for undefined filename */
+#define UNDEFINED_FILENAME "[NONE]"
+
+/* default value for undefined parameter */
+#define ARG_DEFAULT "[DEFAULT]"
+
+/* default values for undefined configuration file parameters */
+#define ARG_UNDEFINED "-1000000"
+#define ARG_UNDEFINED_VALUE (atoi(ARG_UNDEFINED))
+
+/* definitions for game sub-directories */
+#ifndef RO_GAME_DIR
+#define RO_GAME_DIR "."
+#endif
+
+#ifndef RW_GAME_DIR
+#define RW_GAME_DIR "."
+#endif
+
+#define RO_BASE_PATH RO_GAME_DIR
+#define RW_BASE_PATH RW_GAME_DIR
+
+#define GRAPHICS_DIRECTORY "graphics"
+#define SOUNDS_DIRECTORY "sounds"
+#define MUSIC_DIRECTORY "music"
+#define LEVELS_DIRECTORY "levels"
+#define TAPES_DIRECTORY "tapes"
+#define SCORES_DIRECTORY "scores"
+#define DOCS_DIRECTORY "docs"
+
+#if !defined(PLATFORM_MSDOS)
+#define GFX_CLASSIC_SUBDIR "gfx_classic"
+#define SND_CLASSIC_SUBDIR "snd_classic"
+#define MUS_CLASSIC_SUBDIR "mus_classic"
+#else
+#define GFX_CLASSIC_SUBDIR "gfx_orig"
+#define SND_CLASSIC_SUBDIR "snd_orig"
+#define MUS_CLASSIC_SUBDIR "mus_orig"
+#endif
+
+
+/* areas in bitmap PIX_DOOR */
+/* meaning in PIX_DB_DOOR: (3 PAGEs)
+ PAGEX1: 1. buffer for DOOR_1
+ PAGEX2: 2. buffer for DOOR_1
+ PAGEX3: buffer for animations
+*/
+
+#define DOOR_GFX_PAGESIZE (gfx.dxsize)
+#define DOOR_GFX_PAGEX1 (0 * DOOR_GFX_PAGESIZE)
+#define DOOR_GFX_PAGEX2 (1 * DOOR_GFX_PAGESIZE)
+#define DOOR_GFX_PAGEX3 (2 * DOOR_GFX_PAGESIZE)
+#define DOOR_GFX_PAGEX4 (3 * DOOR_GFX_PAGESIZE)
+#define DOOR_GFX_PAGEX5 (4 * DOOR_GFX_PAGESIZE)
+#define DOOR_GFX_PAGEX6 (5 * DOOR_GFX_PAGESIZE)
+#define DOOR_GFX_PAGEX7 (6 * DOOR_GFX_PAGESIZE)
+#define DOOR_GFX_PAGEX8 (7 * DOOR_GFX_PAGESIZE)
+#define DOOR_GFX_PAGEY1 (0)
+#define DOOR_GFX_PAGEY2 (gfx.dysize)
+
+
+/* macros for version handling */
+#define VERSION_IDENT(x,y,z) ((x) * 1000000 + (y) * 10000 + (z) * 100)
+#define RELEASE_IDENT(x,y,z,r) (VERSION_IDENT(x,y,z) + (r))
+#define VERSION_MAJOR(x) ((x) / 1000000)
+#define VERSION_MINOR(x) (((x) % 1000000) / 10000)
+#define VERSION_PATCH(x) (((x) % 10000) / 100)
+#define VERSION_RELEASE(x) ((x) % 100)
+
+
+/* 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(leveldir, type) \
+ ((type) == ARTWORK_TYPE_GRAPHICS ? \
+ (leveldir)->graphics_set : \
+ (type) == ARTWORK_TYPE_SOUNDS ? \
+ (leveldir)->sounds_set : \
+ (leveldir)->music_set)
+
+#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(artwork, type) \
+ ((type) == ARTWORK_TYPE_GRAPHICS ? \
+ (artwork).gfx_current_identifier : \
+ (type) == ARTWORK_TYPE_SOUNDS ? \
+ (artwork).snd_current_identifier : \
+ (artwork).mus_current_identifier)
+
+
+/* type definitions */