Subversion Repositories Games.Chess Giants

Rev

Blame | Last modification | View Log | Download | RSS feed

  1. /*
  2.     Texel - A UCI chess engine.
  3.     Copyright (C) 2013-2014  Peter Österlund, peterosterlund2@gmail.com
  4.  
  5.     This program is free software: you can redistribute it and/or modify
  6.     it under the terms of the GNU General Public License as published by
  7.     the Free Software Foundation, either version 3 of the License, or
  8.     (at your option) any later version.
  9.  
  10.     This program is distributed in the hope that it will be useful,
  11.     but WITHOUT ANY WARRANTY; without even the implied warranty of
  12.     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13.     GNU General Public License for more details.
  14.  
  15.     You should have received a copy of the GNU General Public License
  16.     along with this program.  If not, see <http://www.gnu.org/licenses/>.
  17. */
  18.  
  19. /*
  20.  * material.hpp
  21.  *
  22.  *  Created on: May 1, 2013
  23.  *      Author: petero
  24.  */
  25.  
  26. #ifndef MATERIAL_HPP_
  27. #define MATERIAL_HPP_
  28.  
  29. #include "piece.hpp"
  30.  
  31. /**
  32.  * An incrementally updated material identifier.
  33.  * For each legal piece configuration, a unique identifier is computed.
  34.  */
  35. class MatId {
  36. public:
  37.     static const int WP = 1;
  38.     static const int WR = 9;
  39.     static const int WN = 91;
  40.     static const int WB = 767;
  41.     static const int WQ = 5903;
  42.  
  43.     static const int BP = 1 << 16;
  44.     static const int BR = 9 << 16;
  45.     static const int BN = 91 << 16;
  46.     static const int BB = 767 << 16;
  47.     static const int BQ = 5903 << 16;
  48.  
  49.     MatId();
  50.  
  51.     /** Add a piece to the material configuration. */
  52.     void addPiece(int pType);
  53.  
  54.     /** Remove a piece from the material configuration. */
  55.     void removePiece(int pType);
  56.  
  57.     /** Add cnt pieces of tyep ptype to the material configuration. */
  58.     void addPieceCnt(int pType, int cnt);
  59.  
  60.     /** Get the material configuration identifier. */
  61.     int operator()() const;
  62.  
  63.     /** Get ID for black/white mirror position. */
  64.     static int mirror(int id);
  65.  
  66. private:
  67.     int hash;
  68.     static const int materialId[Piece::nPieceTypes];
  69. };
  70.  
  71. inline
  72. MatId::MatId()
  73.     : hash(0) {
  74. }
  75.  
  76. inline void
  77. MatId::addPiece(int pType) {
  78.     hash += materialId[pType];
  79. }
  80.  
  81. inline void
  82. MatId::removePiece(int pType) {
  83.     hash -= materialId[pType];
  84. }
  85.  
  86. inline void
  87. MatId::addPieceCnt(int pType, int cnt) {
  88.     hash += materialId[pType] * cnt;
  89. }
  90.  
  91. inline int
  92. MatId::operator()() const {
  93.     return hash;
  94. }
  95.  
  96. inline int
  97. MatId::mirror(int h) {
  98.     unsigned int ret = h;
  99.     return (ret >> 16) | ((ret & 0xffff) << 16);
  100. }
  101.  
  102. #endif /* MATERIAL_HPP_ */
  103.