DELTA_NW = DELTA_N + DELTA_W,
};
+enum Direction {
+ DIR_E = 0, DIR_N = 1, DIR_NE = 2, DIR_NW = 3, DIR_NONE = 4
+};
+
+enum SignedDirection {
+ SIGNED_DIR_E = 0, SIGNED_DIR_W = 1,
+ SIGNED_DIR_N = 2, SIGNED_DIR_S = 3,
+ SIGNED_DIR_NE = 4, SIGNED_DIR_SW = 5,
+ SIGNED_DIR_NW = 6, SIGNED_DIR_SE = 7,
+ SIGNED_DIR_NONE = 8
+};
+
ENABLE_OPERATORS_ON(Square);
ENABLE_OPERATORS_ON(File);
ENABLE_OPERATORS_ON(Rank);
ENABLE_OPERATORS_ON(SquareDelta);
+ENABLE_OPERATORS_ON(SignedDirection);
////
const int FlipMask = 56;
const int FlopMask = 7;
+extern uint8_t DirectionTable[64][64];
+extern uint8_t SignedDirectionTable[64][64];
+
////
//// Inline functions
return file_is_ok(square_file(s)) && rank_is_ok(square_rank(s));
}
+inline Direction direction_between_squares(Square s1, Square s2) {
+ return Direction(DirectionTable[s1][s2]);
+}
+
+inline int direction_is_diagonal(Square s1, Square s2) {
+ return DirectionTable[s1][s2] & 2;
+}
+
+inline bool direction_is_straight(Square s1, Square s2) {
+ return DirectionTable[s1][s2] < 2;
+}
+
+////
+//// Prototypes
+////
+
+extern void init_direction_table();
+
#endif // !defined(SQUARE_H_INCLUDED)