X-Git-Url: https://git.sesse.net/?p=stockfish;a=blobdiff_plain;f=src%2Fmaterial.h;h=0119caab8bf2a7d9fd8f2b77934c8facc8ab4692;hp=7d5c3ce1e3f5c215fe27d660ea011e816addff2a;hb=ec36b8dea91f2a7a9c5914557fa06435e00e67db;hpb=bb751d6c890f5c50c642366d601740366cfae8d0 diff --git a/src/material.h b/src/material.h index 7d5c3ce1..0119caab 100644 --- a/src/material.h +++ b/src/material.h @@ -1,152 +1,72 @@ /* - Glaurung, a UCI chess playing engine. - Copyright (C) 2004-2008 Tord Romstad + Stockfish, a UCI chess playing engine derived from Glaurung 2.1 + Copyright (C) 2004-2008 Tord Romstad (Glaurung author) + Copyright (C) 2008-2015 Marco Costalba, Joona Kiiski, Tord Romstad - Glaurung is free software: you can redistribute it and/or modify + 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. - - Glaurung is distributed in the hope that it will be useful, + + 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 . */ - -#if !defined(MATERIAL_H_INCLUDED) +#ifndef MATERIAL_H_INCLUDED #define MATERIAL_H_INCLUDED -//// -//// Includes -//// - #include "endgame.h" +#include "misc.h" #include "position.h" -#include "scale.h" +#include "types.h" +namespace Material { -//// -//// Types -//// - -/// MaterialInfo is a class which contains various information about a -/// material configuration. It contains a material balance evaluation, -/// a function pointer to a special endgame evaluation function (which in -/// most cases is NULL, meaning that the standard evaluation function will -/// be used), and "scale factors" for black and white. +/// Material::Entry contains various information about a material configuration. +/// It contains a material imbalance evaluation, a function pointer to a special +/// endgame evaluation function (which in most cases is NULL, meaning that the +/// standard evaluation function will be used), and scale factors. /// -/// The scale factors are used to scale the evaluation score up or down. -/// For instance, in KRB vs KR endgames, the score is scaled down by a factor -/// of 4, which will result in scores of absolute value less than one pawn. - -class MaterialInfo { - - friend class MaterialInfoTable; - -public: - Value mg_value() const; - Value eg_value() const; - ScaleFactor scale_factor(const Position &pos, Color c) const; - bool specialized_eval_exists() const; - Value evaluate(const Position &pos) const; - - static void init(); +/// The scale factors are used to scale the evaluation score up or down. For +/// instance, in KRB vs KR endgames, the score is scaled down by a factor of 4, +/// which will result in scores of absolute value less than one pawn. + +struct Entry { + + Score imbalance() const { return make_score(value, value); } + Phase game_phase() const { return gamePhase; } + bool specialized_eval_exists() const { return evaluationFunction != NULL; } + Value evaluate(const Position& pos) const { return (*evaluationFunction)(pos); } + + // scale_factor takes a position and a color as input and returns a scale factor + // for the given color. We have to provide the position in addition to the color + // because the scale factor may also be a function which should be applied to + // the position. For instance, in KBP vs K endgames, the scaling function looks + // for rook pawns and wrong-colored bishops. + ScaleFactor scale_factor(const Position& pos, Color c) const { + return !scalingFunction[c] + || (*scalingFunction[c])(pos) == SCALE_FACTOR_NONE ? ScaleFactor(factor[c]) + : (*scalingFunction[c])(pos); + } -private: - void clear(); - Key key; - int16_t mgValue; - int16_t egValue; - uint8_t factor[2]; - EndgameEvaluationFunction *evaluationFunction; - ScalingFunction *scalingFunction[2]; -}; - - -/// The MaterialInfoTable class represents a pawn hash table. It is basically -/// just an array of MaterialInfo objects and a few methods for accessing these -/// objects. The most important method is get_material_info, which looks up a -/// position in the table and returns a pointer to a MaterialInfo object. - -class MaterialInfoTable { - -public: - MaterialInfoTable(unsigned numOfEntries); - ~MaterialInfoTable(); - void clear(); - MaterialInfo *get_material_info(const Position &pos); - -private: - unsigned size; - MaterialInfo *entries; + int16_t value; + uint8_t factor[COLOR_NB]; + EndgameBase* evaluationFunction; + EndgameBase* scalingFunction[COLOR_NB]; // Could be one for each + // side (e.g. KPKP, KBPsKs) + Phase gamePhase; }; +typedef HashTable Table; -//// -//// Inline functions -//// - -/// MaterialInfo::mg_value and MaterialInfo::eg_value simply returns the -/// material balance evaluation for the middle game and the endgame. - -inline Value MaterialInfo::mg_value() const { - return Value(mgValue); -} - -inline Value MaterialInfo::eg_value() const { - return Value(egValue); -} - - -/// MaterialInfo::clear() resets a MaterialInfo object to an empty state, -/// with all slots at their default values. - -inline void MaterialInfo::clear() { - mgValue = egValue = 0; - factor[WHITE] = factor[BLACK] = uint8_t(SCALE_FACTOR_NORMAL); - evaluationFunction = NULL; - scalingFunction[WHITE] = scalingFunction[BLACK] = NULL; -} - - -/// MaterialInfo::scale_factor takes a position and a color as input, and -/// returns a scale factor for the given color. We have to provide the -/// position in addition to the color, because the scale factor need not -/// be a constant: It can also be a function which should be applied to -/// the position. For instance, in KBP vs K endgames, a scaling function -/// which checks for draws with rook pawns and wrong-colored bishops. - -inline ScaleFactor MaterialInfo::scale_factor(const Position &pos, Color c) - const { - if(scalingFunction[c] != NULL) { - ScaleFactor sf = scalingFunction[c]->apply(pos); - if(sf != SCALE_FACTOR_NONE) - return sf; - } - return ScaleFactor(factor[c]); -} - - -/// MaterialInfo::specialized_eval_exists decides whether there is a -/// specialized evaluation function for the current material configuration, -/// or if the normal evaluation function should be used. - -inline bool MaterialInfo::specialized_eval_exists() const { - return evaluationFunction != NULL; -} - - -/// MaterialInfo::evaluate applies a specialized evaluation function to a -/// given position object. It should only be called when -/// this->specialized_eval_exists() returns 'true'. +Entry* probe(const Position& pos); -inline Value MaterialInfo::evaluate(const Position &pos) const { - return evaluationFunction->apply(pos); -} +} // namespace Material -#endif // !defined(MATERIAL_H_INCLUDED) +#endif // #ifndef MATERIAL_H_INCLUDED