2 Stockfish, a UCI chess playing engine derived from Glaurung 2.1
3 Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
4 Copyright (C) 2008-2010 Marco Costalba, Joona Kiiski, Tord Romstad
6 Stockfish is free software: you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation, either version 3 of the License, or
9 (at your option) any later version.
11 Stockfish is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program. If not, see <http://www.gnu.org/licenses/>.
21 #if !defined(DIRECTION_H_INCLUDED)
22 #define DIRECTION_H_INCLUDED
37 DIR_E = 0, DIR_N = 1, DIR_NE = 2, DIR_NW = 3, DIR_NONE = 4
40 enum SignedDirection {
41 SIGNED_DIR_E = 0, SIGNED_DIR_W = 1,
42 SIGNED_DIR_N = 2, SIGNED_DIR_S = 3,
43 SIGNED_DIR_NE = 4, SIGNED_DIR_SW = 5,
44 SIGNED_DIR_NW = 6, SIGNED_DIR_SE = 7,
53 extern uint8_t DirectionTable[64][64];
54 extern uint8_t SignedDirectionTable[64][64];
61 inline void operator++ (Direction& d, int) {
62 d = Direction(int(d) + 1);
65 inline void operator++ (SignedDirection& d, int) {
66 d = SignedDirection(int(d) + 1);
69 inline Direction direction_between_squares(Square s1, Square s2) {
70 return Direction(DirectionTable[s1][s2]);
73 inline SignedDirection signed_direction_between_squares(Square s1, Square s2) {
74 return SignedDirection(SignedDirectionTable[s1][s2]);
77 inline int direction_is_diagonal(Square s1, Square s2) {
78 return DirectionTable[s1][s2] & 2;
81 inline bool direction_is_straight(Square s1, Square s2) {
82 return DirectionTable[s1][s2] < 2;
89 extern void init_direction_table();
92 #endif // !defined(DIRECTION_H_INCLUDED)