-
Notifications
You must be signed in to change notification settings - Fork 472
/
direction.cpp
63 lines (51 loc) · 1.8 KB
/
direction.cpp
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
/*
Stockfish, a UCI chess playing engine derived from Glaurung 2.1
Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
Copyright (C) 2008 Marco Costalba
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 "direction.h"
#include "square.h"
////
//// Variables
////
uint8_t DirectionTable[64][64];
uint8_t SignedDirectionTable[64][64];
////
//// Functions
////
void init_direction_table() {
SquareDelta deltas[8] = {
DELTA_E, DELTA_W, DELTA_N, DELTA_S, DELTA_NE, DELTA_SW, DELTA_NW, DELTA_SE
};
for(Square s1 = SQ_A1; s1 <= SQ_H8; s1++)
for(Square s2 = SQ_A1; s2 <= SQ_H8; s2++) {
DirectionTable[s1][s2] = uint8_t(DIR_NONE);
SignedDirectionTable[s1][s2] = uint8_t(SIGNED_DIR_NONE);
if(s1 == s2) continue;
for(SignedDirection d = SIGNED_DIR_E; d <= SIGNED_DIR_SE; d++) {
SquareDelta delta = deltas[d];
Square s3, s4;
for(s4 = s1 + delta, s3 = s1;
square_distance(s4, s3) == 1 && s4 != s2 && square_is_ok(s4);
s3 = s4, s4 += delta);
if(s4 == s2 && square_distance(s4, s3) == 1) {
SignedDirectionTable[s1][s2] = uint8_t(d);
DirectionTable[s1][s2] = uint8_t(d/2);
break;
}
}
}
}