};
enum SquareDelta {
- DELTA_SSW = -021, DELTA_SS = -020, DELTA_SSE = -017, DELTA_SWW = -012,
- DELTA_SW = -011, DELTA_S = -010, DELTA_SE = -07, DELTA_SEE = -06,
- DELTA_W = -01, DELTA_ZERO = 0, DELTA_E = 01, DELTA_NWW = 06, DELTA_NW = 07,
- DELTA_N = 010, DELTA_NE = 011, DELTA_NEE = 012, DELTA_NNW = 017,
- DELTA_NN = 020, DELTA_NNE = 021
+
+ DELTA_N = 8, DELTA_E = 1, DELTA_S = -8, DELTA_W = -1,
+
+ DELTA_NN = DELTA_N + DELTA_N,
+ DELTA_NE = DELTA_N + DELTA_E,
+ DELTA_SE = DELTA_S + DELTA_E,
+ DELTA_SS = DELTA_S + DELTA_S,
+ DELTA_SW = DELTA_S + DELTA_W,
+ DELTA_NW = DELTA_N + DELTA_W,
+};
+
+enum Direction {
+ DIR_E = 0, DIR_N = 1, DIR_NE = 2, DIR_NW = 3, DIR_NONE = 4
};
+
ENABLE_OPERATORS_ON(Square);
ENABLE_OPERATORS_ON(File);
ENABLE_OPERATORS_ON(Rank);
ENABLE_OPERATORS_ON(SquareDelta);
+ENABLE_OPERATORS_ON(Direction);
////
//// Constants
////
-const int FlipMask = 070;
-const int FlopMask = 07;
+const int FlipMask = 56;
+const int FlopMask = 7;
+
+extern uint8_t DirectionTable[64][64];
////
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)