-/*
- Stockfish, a UCI chess playing engine derived from Glaurung 2.1
- Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
- Copyright (C) 2008-2010 Marco Costalba, Joona Kiiski, Tord Romstad
-
- Stockfish is free software: you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published by
- the Free Software Foundation, either version 3 of the License, or
- (at your option) any later version.
-
- Stockfish is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU General Public License for more details.
-
- You should have received a copy of the GNU General Public License
- along with this program. If not, see <http://www.gnu.org/licenses/>.
-*/
-
-
-////
-//// Includes
-////
-
-#include "square.h"
-
-int8_t DirectionTable[64][64];
-
-
-static SquareDelta direction(Square orig, Square dest) {
-
- const SquareDelta directions[] = {
- DELTA_E, DELTA_N, DELTA_NE, DELTA_NW, DELTA_W, DELTA_S, DELTA_SW, DELTA_SE
- };
-
- Square from, to;
-
- for (int idx = 0; idx < 8; idx++)
- {
- from = orig;
- to = from + directions[idx];
-
- while (to != dest && square_distance(to, from) == 1 && square_is_ok(to))
- {
- from = to;
- to += directions[idx];
- }
-
- if (to == dest && square_distance(from, to) == 1)
- return directions[idx];
- }
- return DELTA_NONE;
-}
-
-void init_direction_table() {
-
- for (Square s1 = SQ_A1; s1 <= SQ_H8; s1++)
- for (Square s2 = SQ_A1; s2 <= SQ_H8; s2++)
- DirectionTable[s1][s2] = uint8_t(direction(s1, s2));
-}