63 lines
1.7 KiB
C++
63 lines
1.7 KiB
C++
/*
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Glaurung, a UCI chess playing engine.
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Copyright (C) 2004-2008 Tord Romstad
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Glaurung is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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Glaurung is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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////
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//// Includes
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////
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#include "direction.h"
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#include "square.h"
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////
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//// Variables
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////
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uint8_t DirectionTable[64][64];
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uint8_t SignedDirectionTable[64][64];
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////
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//// Functions
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////
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void init_direction_table() {
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SquareDelta deltas[8] = {
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DELTA_E, DELTA_W, DELTA_N, DELTA_S, DELTA_NE, DELTA_SW, DELTA_NW, DELTA_SE
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};
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for(Square s1 = SQ_A1; s1 <= SQ_H8; s1++)
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for(Square s2 = SQ_A1; s2 <= SQ_H8; s2++) {
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DirectionTable[s1][s2] = uint8_t(DIR_NONE);
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SignedDirectionTable[s1][s2] = uint8_t(SIGNED_DIR_NONE);
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if(s1 == s2) continue;
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for(SignedDirection d = SIGNED_DIR_E; d <= SIGNED_DIR_SE; d++) {
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SquareDelta delta = deltas[d];
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Square s3, s4;
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for(s4 = s1 + delta, s3 = s1;
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square_distance(s4, s3) == 1 && s4 != s2 && square_is_ok(s4);
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s3 = s4, s4 += delta);
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if(s4 == s2 && square_distance(s4, s3) == 1) {
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SignedDirectionTable[s1][s2] = uint8_t(d);
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DirectionTable[s1][s2] = uint8_t(d/2);
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break;
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}
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}
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}
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}
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