+#define MIN_WINDOW_SCALING_PERCENT 50
+#define STD_WINDOW_SCALING_PERCENT 100
+#define MAX_WINDOW_SCALING_PERCENT 300
+#define STEP_WINDOW_SCALING_PERCENT 10
+
+/* values for window scaling quality */
+#define SCALING_QUALITY_NEAREST "nearest"
+#define SCALING_QUALITY_LINEAR "linear"
+#define SCALING_QUALITY_BEST "best"
+
+#define SCALING_QUALITY_DEFAULT SCALING_QUALITY_LINEAR
+
+/* values for screen rendering mode */
+#define STR_SPECIAL_RENDERING_OFF "stream_texture_only"
+#define STR_SPECIAL_RENDERING_BITMAP "bitmap_and_stream_texture"
+#define STR_SPECIAL_RENDERING_TARGET "target_texture_only"
+#define STR_SPECIAL_RENDERING_DOUBLE "stream_and_target_texture"
+
+#if defined(TARGET_SDL2)
+#define STR_SPECIAL_RENDERING_DEFAULT STR_SPECIAL_RENDERING_DOUBLE
+#else
+#define STR_SPECIAL_RENDERING_DEFAULT STR_SPECIAL_RENDERING_BITMAP
+#endif
+
+#define SPECIAL_RENDERING_OFF 0
+#define SPECIAL_RENDERING_BITMAP 1
+#define SPECIAL_RENDERING_TARGET 2
+#define SPECIAL_RENDERING_DOUBLE 3
+
+#if defined(TARGET_SDL2)
+#define SPECIAL_RENDERING_DEFAULT SPECIAL_RENDERING_DOUBLE
+#else
+#define SPECIAL_RENDERING_DEFAULT SPECIAL_RENDERING_BITMAP
+#endif
+
+/* values for touch control */
+#define TOUCH_CONTROL_VIRTUAL_BUTTONS "virtual_buttons"
+#define TOUCH_CONTROL_WIPE_GESTURES "wipe_gestures"
+
+#define TOUCH_CONTROL_DEFAULT TOUCH_CONTROL_VIRTUAL_BUTTONS
+
+#define TOUCH_MOVE_DISTANCE_DEFAULT 2
+#define TOUCH_DROP_DISTANCE_DEFAULT 5
+
+
+/* default input keys */
+#define DEFAULT_KEY_LEFT KSYM_Left
+#define DEFAULT_KEY_RIGHT KSYM_Right
+#define DEFAULT_KEY_UP KSYM_Up
+#define DEFAULT_KEY_DOWN KSYM_Down
+#if defined(PLATFORM_MACOSX)
+#define DEFAULT_KEY_SNAP KSYM_Control_L
+#define DEFAULT_KEY_DROP KSYM_KP_Enter
+#else
+#define DEFAULT_KEY_SNAP KSYM_Control_L
+#define DEFAULT_KEY_DROP KSYM_Control_R
+#endif
+#define DEFAULT_KEY_OKAY KSYM_Return
+#define DEFAULT_KEY_CANCEL KSYM_Escape
+
+/* default shortcut keys */
+#define DEFAULT_KEY_SAVE_GAME KSYM_F1
+#define DEFAULT_KEY_LOAD_GAME KSYM_F2
+#define DEFAULT_KEY_TOGGLE_PAUSE KSYM_space
+#define DEFAULT_KEY_FOCUS_PLAYER_1 KSYM_F5
+#define DEFAULT_KEY_FOCUS_PLAYER_2 KSYM_F6
+#define DEFAULT_KEY_FOCUS_PLAYER_3 KSYM_F7
+#define DEFAULT_KEY_FOCUS_PLAYER_4 KSYM_F8
+#define DEFAULT_KEY_FOCUS_PLAYER_ALL KSYM_F9
+#define DEFAULT_KEY_TAPE_EJECT KSYM_UNDEFINED
+#define DEFAULT_KEY_TAPE_EXTRA KSYM_UNDEFINED
+#define DEFAULT_KEY_TAPE_STOP KSYM_UNDEFINED
+#define DEFAULT_KEY_TAPE_PAUSE KSYM_UNDEFINED
+#define DEFAULT_KEY_TAPE_RECORD KSYM_UNDEFINED
+#define DEFAULT_KEY_TAPE_PLAY KSYM_UNDEFINED
+#define DEFAULT_KEY_SOUND_SIMPLE KSYM_UNDEFINED
+#define DEFAULT_KEY_SOUND_LOOPS KSYM_UNDEFINED
+#define DEFAULT_KEY_SOUND_MUSIC KSYM_UNDEFINED
+#define DEFAULT_KEY_SNAP_LEFT KSYM_UNDEFINED
+#define DEFAULT_KEY_SNAP_RIGHT KSYM_UNDEFINED
+#define DEFAULT_KEY_SNAP_UP KSYM_UNDEFINED
+#define DEFAULT_KEY_SNAP_DOWN KSYM_UNDEFINED
+
+/* values for key_status */
+#define KEY_NOT_PRESSED FALSE
+#define KEY_RELEASED FALSE
+#define KEY_PRESSED TRUE
+
+/* values for button status */
+#define MB_NOT_PRESSED FALSE
+#define MB_NOT_RELEASED TRUE
+#define MB_RELEASED FALSE
+#define MB_PRESSED TRUE
+#define MB_MENU_CHOICE FALSE
+#define MB_MENU_MARK TRUE
+#define MB_MENU_INITIALIZE (-1)
+#define MB_MENU_LEAVE (-2)
+#define MB_LEFTBUTTON 1
+#define MB_MIDDLEBUTTON 2
+#define MB_RIGHTBUTTON 3
+#define MB_WHEEL_UP 4
+#define MB_WHEEL_DOWN 5
+#define MB_WHEEL_LEFT 6
+#define MB_WHEEL_RIGHT 7
+#define IS_WHEEL_BUTTON_VERTICAL(b) ((b) >= MB_WHEEL_UP && \
+ (b) <= MB_WHEEL_DOWN)
+#define IS_WHEEL_BUTTON_HORIZONTAL(b) ((b) >= MB_WHEEL_LEFT && \
+ (b) <= MB_WHEEL_RIGHT)
+#define IS_WHEEL_BUTTON(b) ((b) >= MB_WHEEL_UP && \
+ (b) <= MB_WHEEL_DOWN)
+#define DEFAULT_WHEEL_STEPS 3
+
+#define BUTTON_STEPSIZE(b) ((b) == MB_LEFTBUTTON ? 1 : \
+ (b) == MB_MIDDLEBUTTON ? 5 : \
+ (b) == MB_RIGHTBUTTON ? 10 : 1)
+
+/* values for move directions */
+#define MV_BIT_LEFT 0
+#define MV_BIT_RIGHT 1
+#define MV_BIT_UP 2
+#define MV_BIT_DOWN 3
+
+#define NUM_DIRECTIONS 4
+
+/* diagonal movement directions are used in a different contect than buttons */
+#define MV_BIT_UPLEFT 4
+#define MV_BIT_UPRIGHT 5
+#define MV_BIT_DOWNLEFT 6
+#define MV_BIT_DOWNRIGHT 7
+
+#define NUM_DIRECTIONS_FULL 8
+
+/* values for special "button" bitmasks */
+#define BUTTON_1 4
+#define BUTTON_2 5
+
+#define NUM_PLAYER_ACTIONS 6
+
+/* values for special "focus player" bitmasks */
+#define BIT_SET_FOCUS 6
+
+/* values for drawing stages for global animations */
+#define DRAW_GLOBAL_ANIM_STAGE_1 1
+#define DRAW_GLOBAL_ANIM_STAGE_2 2
+
+/* values for drawing target for global border */
+#define DRAW_BORDER_TO_BACKBUFFER 0
+#define DRAW_BORDER_TO_SCREEN 1
+#define DRAW_BORDER_TO_FADE_SOURCE 2
+#define DRAW_BORDER_TO_FADE_TARGET 3
+
+/* values for move directions and special "button" key bitmasks */
+#define MV_NONE 0
+#define MV_LEFT (1 << MV_BIT_LEFT)
+#define MV_RIGHT (1 << MV_BIT_RIGHT)
+#define MV_UP (1 << MV_BIT_UP)
+#define MV_DOWN (1 << MV_BIT_DOWN)
+
+#define MV_UPLEFT (MV_UP | MV_LEFT)
+#define MV_UPRIGHT (MV_UP | MV_RIGHT)
+#define MV_DOWNLEFT (MV_DOWN | MV_LEFT)
+#define MV_DOWNRIGHT (MV_DOWN | MV_RIGHT)
+
+#define MV_HORIZONTAL (MV_LEFT | MV_RIGHT)
+#define MV_VERTICAL (MV_UP | MV_DOWN)
+#define MV_ALL_DIRECTIONS (MV_LEFT | MV_RIGHT | MV_UP | MV_DOWN)
+#define MV_ANY_DIRECTION (MV_ALL_DIRECTIONS)
+#define MV_NO_DIRECTION (MV_NONE)
+
+#define KEY_BUTTON_1 (1 << BUTTON_1)
+#define KEY_BUTTON_2 (1 << BUTTON_2)
+#define KEY_BUTTON_SNAP KEY_BUTTON_1
+#define KEY_BUTTON_DROP KEY_BUTTON_2
+#define KEY_MOTION (MV_LEFT | MV_RIGHT | MV_UP | MV_DOWN)
+#define KEY_BUTTON (KEY_BUTTON_1 | KEY_BUTTON_2)
+#define KEY_ACTION (KEY_MOTION | KEY_BUTTON)
+
+#define KEY_SET_FOCUS (1 << BIT_SET_FOCUS)
+
+#define MV_DIR_FROM_BIT(x) ((x) < NUM_DIRECTIONS ? 1 << (x) : \
+ (x) == MV_BIT_UPLEFT ? MV_UPLEFT : \
+ (x) == MV_BIT_UPRIGHT ? MV_UPRIGHT : \
+ (x) == MV_BIT_DOWNLEFT ? MV_DOWNLEFT : \
+ (x) == MV_BIT_DOWNRIGHT ? MV_DOWNRIGHT : \
+ MV_NONE)
+
+#define MV_DIR_TO_BIT(x) ((x) == MV_LEFT ? MV_BIT_LEFT : \
+ (x) == MV_RIGHT ? MV_BIT_RIGHT : \
+ (x) == MV_UP ? MV_BIT_UP : \
+ (x) == MV_DOWN ? MV_BIT_DOWN : \
+ (x) == MV_UPLEFT ? MV_BIT_UPLEFT : \
+ (x) == MV_UPRIGHT ? MV_BIT_UPRIGHT : \
+ (x) == MV_DOWNLEFT ? MV_BIT_DOWNLEFT : \
+ (x) == MV_DOWNRIGHT ? MV_BIT_DOWNRIGHT : \
+ MV_BIT_DOWN)
+
+#define MV_DIR_OPPOSITE(x) ((x) == MV_LEFT ? MV_RIGHT : \
+ (x) == MV_RIGHT ? MV_LEFT : \
+ (x) == MV_UP ? MV_DOWN : \
+ (x) == MV_DOWN ? MV_UP : \
+ (x) == MV_UPLEFT ? MV_DOWNRIGHT : \
+ (x) == MV_UPRIGHT ? MV_DOWNLEFT : \
+ (x) == MV_DOWNLEFT ? MV_UPRIGHT : \
+ (x) == MV_DOWNRIGHT ? MV_UPLEFT : \
+ MV_NONE)
+
+/* values for animation mode (frame order and direction) */
+/* (stored in level files -- never change existing values) */
+#define ANIM_NONE 0
+#define ANIM_LOOP (1 << 0)
+#define ANIM_LINEAR (1 << 1)
+#define ANIM_PINGPONG (1 << 2)
+#define ANIM_PINGPONG2 (1 << 3)
+#define ANIM_RANDOM (1 << 4)
+#define ANIM_CE_VALUE (1 << 5)
+#define ANIM_CE_SCORE (1 << 6)
+#define ANIM_CE_DELAY (1 << 7)
+#define ANIM_REVERSE (1 << 8)
+#define ANIM_OPAQUE_PLAYER (1 << 9)
+
+/* values for special (non game element) animation modes */
+/* (not stored in level files -- can be changed, if needed) */
+#define ANIM_HORIZONTAL (1 << 10)
+#define ANIM_VERTICAL (1 << 11)
+#define ANIM_CENTERED (1 << 12)
+#define ANIM_STATIC_PANEL (1 << 13)
+#define ANIM_ALL (1 << 14)
+#define ANIM_ONCE (1 << 15)
+
+#define ANIM_DEFAULT ANIM_LOOP
+
+/* values for special drawing styles (currently only for crumbled graphics) */
+#define STYLE_NONE 0
+#define STYLE_ACCURATE_BORDERS (1 << 0)
+#define STYLE_INNER_CORNERS (1 << 1)
+
+#define STYLE_DEFAULT STYLE_NONE
+
+/* values for fade mode */
+#define FADE_TYPE_NONE 0
+#define FADE_TYPE_FADE_IN (1 << 0)
+#define FADE_TYPE_FADE_OUT (1 << 1)
+#define FADE_TYPE_TRANSFORM (1 << 2)
+#define FADE_TYPE_CROSSFADE (1 << 3)
+#define FADE_TYPE_MELT (1 << 4)
+#define FADE_TYPE_CURTAIN (1 << 5)
+#define FADE_TYPE_SKIP (1 << 6)
+
+#define FADE_MODE_NONE (FADE_TYPE_NONE)
+#define FADE_MODE_FADE_IN (FADE_TYPE_FADE_IN)
+#define FADE_MODE_FADE_OUT (FADE_TYPE_FADE_OUT)
+#define FADE_MODE_FADE (FADE_TYPE_FADE_IN | FADE_TYPE_FADE_OUT)
+#define FADE_MODE_TRANSFORM (FADE_TYPE_TRANSFORM | FADE_TYPE_FADE_IN)
+#define FADE_MODE_CROSSFADE (FADE_MODE_TRANSFORM | FADE_TYPE_CROSSFADE)
+#define FADE_MODE_MELT (FADE_MODE_TRANSFORM | FADE_TYPE_MELT)
+#define FADE_MODE_CURTAIN (FADE_MODE_TRANSFORM | FADE_TYPE_CURTAIN)
+#define FADE_MODE_SKIP_FADE_IN (FADE_TYPE_SKIP | FADE_TYPE_FADE_IN)
+#define FADE_MODE_SKIP_FADE_OUT (FADE_TYPE_SKIP | FADE_TYPE_FADE_OUT)
+
+#define FADE_MODE_DEFAULT FADE_MODE_FADE
+
+/* values for toon positions */
+#define POS_UNDEFINED -1
+#define POS_LEFT 0
+#define POS_RIGHT 1
+#define POS_TOP 2
+#define POS_UPPER 3
+#define POS_MIDDLE 4
+#define POS_LOWER 5
+#define POS_BOTTOM 6
+#define POS_ANY 7
+
+/* values for text alignment */
+#define ALIGN_LEFT (1 << 0)
+#define ALIGN_RIGHT (1 << 1)
+#define ALIGN_CENTER (1 << 2)
+#define ALIGN_DEFAULT ALIGN_LEFT
+
+#define VALIGN_TOP (1 << 0)
+#define VALIGN_BOTTOM (1 << 1)
+#define VALIGN_MIDDLE (1 << 2)
+#define VALIGN_DEFAULT VALIGN_TOP
+
+#define ALIGNED_XPOS(x,w,a) ((a) == ALIGN_CENTER ? (x) - (w) / 2 : \
+ (a) == ALIGN_RIGHT ? (x) - (w) : (x))
+#define ALIGNED_YPOS(y,h,v) ((v) == VALIGN_MIDDLE ? (y) - (h) / 2 : \
+ (v) == VALIGN_BOTTOM ? (y) - (h) : (y))
+#define ALIGNED_TEXT_XPOS(p) ALIGNED_XPOS((p)->x, (p)->width, (p)->align)
+#define ALIGNED_TEXT_YPOS(p) ALIGNED_YPOS((p)->y, (p)->height, (p)->valign)
+
+/* values for redraw_mask */
+#define REDRAW_NONE (0)
+#define REDRAW_ALL (1 << 0)
+#define REDRAW_FIELD (1 << 1)
+#define REDRAW_DOOR_1 (1 << 2)
+#define REDRAW_DOOR_2 (1 << 3)
+#define REDRAW_DOOR_3 (1 << 4)
+#define REDRAW_FPS (1 << 5)
+
+#define REDRAW_DOORS (REDRAW_DOOR_1 | \
+ REDRAW_DOOR_2 | \
+ REDRAW_DOOR_3)
+
+#define IN_GFX_FIELD_PLAY(x, y) (x >= gfx.sx && x < gfx.sx + gfx.sxsize && \
+ y >= gfx.sy && y < gfx.sy + gfx.sysize)
+#define IN_GFX_FIELD_FULL(x, y) (x >= gfx.real_sx && \
+ x < gfx.real_sx + gfx.full_sxsize && \
+ y >= gfx.real_sy && \
+ y < gfx.real_sy + gfx.full_sysize)
+#define IN_GFX_DOOR_1(x, y) (x >= gfx.dx && x < gfx.dx + gfx.dxsize && \
+ y >= gfx.dy && y < gfx.dy + gfx.dysize)
+#define IN_GFX_DOOR_2(x, y) (x >= gfx.vx && x < gfx.vx + gfx.vxsize && \
+ y >= gfx.vy && y < gfx.vy + gfx.vysize)
+#define IN_GFX_DOOR_3(x, y) (x >= gfx.ex && x < gfx.ex + gfx.exsize && \
+ y >= gfx.ey && y < gfx.ey + gfx.eysize)
+
+/* values for mouse cursor */
+#define CURSOR_DEFAULT 0
+#define CURSOR_NONE 1
+#define CURSOR_PLAYFIELD 2
+
+/* fundamental game speed values */
+#define ONE_SECOND_DELAY 1000 /* delay value for one second */
+#define GAME_FRAME_DELAY 20 /* frame delay in milliseconds */
+#define FFWD_FRAME_DELAY 10 /* 200% speed for fast forward */
+#define FRAMES_PER_SECOND (ONE_SECOND_DELAY / GAME_FRAME_DELAY)
+#define FRAMES_PER_SECOND_SP 35
+
+/* maximum playfield size supported by libgame functions */
+#define MAX_PLAYFIELD_WIDTH 128
+#define MAX_PLAYFIELD_HEIGHT 128
+
+/* 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
+
+/* maximum number of levels in a level set */
+#define MAX_LEVELS 1000
+
+/* 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 levelset */
+#define UNDEFINED_LEVELSET "[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 (-1000000)
+
+/* default value for off-screen positions */
+#define POS_OFFSCREEN (-1000000)
+
+/* 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"
+#define CACHE_DIRECTORY "cache"
+
+#define GFX_CLASSIC_SUBDIR "gfx_classic"
+#define SND_CLASSIC_SUBDIR "snd_classic"
+#define MUS_CLASSIC_SUBDIR "mus_classic"
+
+#define GFX_DEFAULT_SUBDIR (setup.internal.default_graphics_set)
+#define SND_DEFAULT_SUBDIR (setup.internal.default_sounds_set)
+#define MUS_DEFAULT_SUBDIR (setup.internal.default_music_set)
+
+#define GFX_FALLBACK_FILENAME (setup.internal.fallback_graphics_file)
+#define SND_FALLBACK_FILENAME (setup.internal.fallback_sounds_file)
+#define MUS_FALLBACK_FILENAME (setup.internal.fallback_music_file)
+
+#define DEFAULT_LEVELSET (setup.internal.default_level_series)
+
+/* file names and filename extensions */
+#define LEVELSETUP_DIRECTORY "levelsetup"
+#define SETUP_FILENAME "setup.conf"
+#define LEVELSETUP_FILENAME "levelsetup.conf"
+#define EDITORSETUP_FILENAME "editorsetup.conf"
+#define EDITORCASCADE_FILENAME "editorcascade.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 ARTWORKINFO_CACHE_FILE "artworkinfo.cache"
+#define LEVELFILE_EXTENSION "level"
+#define TAPEFILE_EXTENSION "tape"
+#define SCOREFILE_EXTENSION "score"
+
+#define LOG_OUT_BASENAME "stdout.txt"
+#define LOG_ERR_BASENAME "stderr.txt"
+
+#define LOG_OUT_ID 0
+#define LOG_ERR_ID 1
+#define NUM_LOGS 2
+
+#define STRING_PARENT_DIRECTORY ".."
+#define STRING_TOP_DIRECTORY "/"
+
+#define CHAR_PATH_SEPARATOR_UNIX '/'
+#define CHAR_PATH_SEPARATOR_DOS '\\'