+/* the additional 'b' is needed for Win32 to open files in binary mode */
+#define MODE_READ "rb"
+#define MODE_WRITE "wb"
+#define MODE_APPEND "ab"
+
+#define DEFAULT_DEPTH 0
+
+#define BLIT_OPAQUE 0
+#define BLIT_MASKED 1
+#define BLIT_INVERSE 2
+#define BLIT_ON_BACKGROUND 3
+
+#define FULLSCREEN_NOT_AVAILABLE FALSE
+#define FULLSCREEN_AVAILABLE TRUE
+
+/* 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_BOMB KSYM_KP_Enter
+#else
+#define DEFAULT_KEY_SNAP KSYM_Shift_L
+#define DEFAULT_KEY_BOMB KSYM_Shift_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
+
+
+/* values for basic move directions (effective at runtime) */
+#define MV_BIT_LEFT 0
+#define MV_BIT_RIGHT 1
+#define MV_BIT_UP 2
+#define MV_BIT_DOWN 3
+
+#define NUM_DIRECTIONS 4
+
+/* values for special "button" bitmasks (effective at runtime) */
+#define BUTTON_1 4
+#define BUTTON_2 5
+
+/* values for special move patterns (stored in level files) */
+#define MV_BIT_TOWARDS_PLAYER 6
+#define MV_BIT_AWAY_FROM_PLAYER 7
+#define MV_BIT_ALONG_LEFT_SIDE 8
+#define MV_BIT_ALONG_RIGHT_SIDE 9
+
+/* values for move direction/pattern and special "button" key bitmasks */
+#define MV_NO_MOVING 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 KEY_BUTTON_1 (1 << BUTTON_1)
+#define KEY_BUTTON_2 (1 << 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 MV_DIR_BIT(x) ((x) == MV_LEFT ? MV_BIT_LEFT : \
+ (x) == MV_RIGHT ? MV_BIT_RIGHT : \
+ (x) == MV_UP ? MV_BIT_UP : MV_BIT_DOWN)
+
+#define MV_HORIZONTAL (MV_LEFT | MV_RIGHT)
+#define MV_VERTICAL (MV_UP | MV_DOWN)
+#define MV_ALL_DIRECTIONS (MV_HORIZONTAL | MV_VERTICAL)
+#define MV_ANY_DIRECTION (MV_ALL_DIRECTIONS)
+#define MV_TOWARDS_PLAYER (1 << MV_BIT_TOWARDS_PLAYER)
+#define MV_AWAY_FROM_PLAYER (1 << MV_BIT_AWAY_FROM_PLAYER)
+#define MV_ALONG_LEFT_SIDE (1 << MV_BIT_ALONG_LEFT_SIDE)
+#define MV_ALONG_RIGHT_SIDE (1 << MV_BIT_ALONG_RIGHT_SIDE)
+
+/* values for button status */