+#define IN_GFX_SCREEN(x, y) (x >= gfx.sx && x < gfx.sx + gfx.sxsize && \
+ y >= gfx.sy && y < gfx.sy + gfx.sysize)
+#define IN_GFX_DOOR(x, y) (x >= gfx.dx && x < gfx.dx + gfx.dxsize && \
+ y >= gfx.dy && y < gfx.dy + gfx.dysize)
+#define IN_GFX_VIDEO(x, y) (x >= gfx.vx && x < gfx.vx + gfx.vxsize && \
+ y >= gfx.vy && y < gfx.vy + gfx.vysize)
+
+/* values for mouse cursor */
+#define CURSOR_DEFAULT 0
+#define CURSOR_PLAYFIELD 1
+
+
+/* maximum number of parallel players supported by libgame functions */
+#define MAX_PLAYERS 4
+
+/* maximum allowed length of player name */
+#define MAX_PLAYER_NAME_LEN 10
+
+/* default name for empty highscore entry */
+#define EMPTY_PLAYER_NAME "no name"
+
+/* default name for unknown player names */
+#define ANONYMOUS_NAME "anonymous"
+
+/* default for other unknown names */
+#define UNKNOWN_NAME "unknown"
+
+/* 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
+
+/* directory names */
+#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
+
+/* file names and filename extensions */
+#if !defined(PLATFORM_MSDOS)
+#define LEVELSETUP_DIRECTORY "levelsetup"
+#define SETUP_FILENAME "setup.conf"
+#define LEVELSETUP_FILENAME "levelsetup.conf"
+#define EDITORSETUP_FILENAME "editorsetup.conf"
+#define HELPANIM_FILENAME "helpanim.conf"
+#define HELPTEXT_FILENAME "helptext.conf"
+#define LEVELINFO_FILENAME "levelinfo.conf"
+#define GRAPHICSINFO_FILENAME "graphicsinfo.conf"
+#define SOUNDSINFO_FILENAME "soundsinfo.conf"
+#define MUSICINFO_FILENAME "musicinfo.conf"
+#define LEVELFILE_EXTENSION "level"
+#define TAPEFILE_EXTENSION "tape"
+#define SCOREFILE_EXTENSION "score"
+#else
+#define LEVELSETUP_DIRECTORY "lvlsetup"
+#define SETUP_FILENAME "setup.cnf"
+#define LEVELSETUP_FILENAME "lvlsetup.cnf"
+#define EDITORSETUP_FILENAME "edsetup.cnf"
+#define HELPANIM_FILENAME "helpanim.cnf"
+#define HELPTEXT_FILENAME "helptext.cnf"
+#define LEVELINFO_FILENAME "lvlinfo.cnf"
+#define GRAPHICSINFO_FILENAME "gfxinfo.cnf"
+#define SOUNDSINFO_FILENAME "sndinfo.cnf"
+#define MUSICINFO_FILENAME "musinfo.cnf"
+#define LEVELFILE_EXTENSION "lvl"
+#define TAPEFILE_EXTENSION "tap"
+#define SCOREFILE_EXTENSION "sco"
+#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
+*/
+
+/* these values are hard-coded to be able to use them in initialization */
+#define DOOR_GFX_PAGE_WIDTH 100 /* should be set to "gfx.dxsize" */
+#define DOOR_GFX_PAGE_HEIGHT 280 /* should be set to "gfx.dysize" */
+
+#define DOOR_GFX_PAGESIZE (DOOR_GFX_PAGE_WIDTH)
+#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 (DOOR_GFX_PAGE_HEIGHT)
+
+
+/* macros for version handling */
+#define VERSION_MAJOR(x) ((x) / 1000000)
+#define VERSION_MINOR(x) (((x) % 1000000) / 10000)
+#define VERSION_PATCH(x) (((x) % 10000) / 100)
+#define VERSION_BUILD(x) ((x) % 100)
+#define VERSION_IDENT(a,b,c,d) ((a) * 1000000 + (b) * 10000 + (c) * 100 + (d))
+
+
+/* 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)
+
+#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 : "")