X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;ds=sidebyside;f=src%2Fmaterial.h;h=80d016551113e7bcac6eb03b6c4713bad2d5aac3;hb=HEAD;hp=67d555a461935215e729717241ccf94d40c5f59b;hpb=e53774bc49dd0aaa1c129ee98c09e1a56ef974fb;p=stockfish
diff --git a/src/material.h b/src/material.h
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-/*
- 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
-
- 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 .
-*/
-
-#ifndef MATERIAL_H_INCLUDED
-#define MATERIAL_H_INCLUDED
-
-#include "endgame.h"
-#include "misc.h"
-#include "position.h"
-#include "types.h"
-
-namespace Material {
-
-/// 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.
-
-struct Entry {
-
- Score imbalance() const { return make_score(value, value); }
- Phase game_phase() const { return gamePhase; }
- bool specialized_eval_exists() const { return evaluationFunction != nullptr; }
- 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);
- }
-
- Key key;
- 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;
-
-Entry* probe(const Position& pos);
-
-} // namespace Material
-
-#endif // #ifndef MATERIAL_H_INCLUDED