X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;f=src%2Fmaterial.h;h=26535a535afb295bdcbcfe6bfe66664ff4b2a6e6;hb=7d44b43b3ceb2eebc756709432a0e291f885a1d2;hp=96fd3f8fe994124b30d28d08486c1b391f456164;hpb=ee5514b8fdc6583d134985edd2f875e197830030;p=stockfish
diff --git a/src/material.h b/src/material.h
index 96fd3f8f..26535a53 100644
--- a/src/material.h
+++ b/src/material.h
@@ -1,7 +1,6 @@
/*
Stockfish, a UCI chess playing engine derived from Glaurung 2.1
- Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
- Copyright (C) 2008-2013 Marco Costalba, Joona Kiiski, Tord Romstad
+ Copyright (C) 2004-2021 The Stockfish developers (see AUTHORS file)
Stockfish is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
@@ -17,7 +16,7 @@
along with this program. If not, see .
*/
-#if !defined(MATERIAL_H_INCLUDED)
+#ifndef MATERIAL_H_INCLUDED
#define MATERIAL_H_INCLUDED
#include "endgame.h"
@@ -25,53 +24,48 @@
#include "position.h"
#include "types.h"
-namespace Material {
+namespace Stockfish::Material {
/// Material::Entry contains various information about a material configuration.
-/// It contains a material balance evaluation, a function pointer to a special
+/// 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".
+/// 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.
+/// 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 material_value() const { return make_score(value, value); }
- Score space_weight() const { return spaceWeight; }
- Phase game_phase() const { return gamePhase; }
- bool specialized_eval_exists() const { return evaluationFunction != NULL; }
- Value evaluate(const Position& p) const { return (*evaluationFunction)(p); }
- ScaleFactor scale_factor(const Position& pos, Color c) const;
+ Score imbalance() const { return score; }
+ Phase game_phase() const { return (Phase)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 {
+ ScaleFactor sf = scalingFunction[c] ? (*scalingFunction[c])(pos)
+ : SCALE_FACTOR_NONE;
+ return sf != SCALE_FACTOR_NONE ? sf : ScaleFactor(factor[c]);
+ }
Key key;
- int16_t value;
+ const EndgameBase* evaluationFunction;
+ const EndgameBase* scalingFunction[COLOR_NB]; // Could be one for each
+ // side (e.g. KPKP, KBPsK)
+ Score score;
+ int16_t gamePhase;
uint8_t factor[COLOR_NB];
- EndgameBase* evaluationFunction;
- EndgameBase* scalingFunction[COLOR_NB];
- Score spaceWeight;
- Phase gamePhase;
};
typedef HashTable Table;
-Entry* probe(const Position& pos, Table& entries, Endgames& endgames);
-Phase game_phase(const Position& pos);
+Entry* probe(const Position& pos);
-/// Material::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
-/// to 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.
+} // namespace Stockfish::Material
-inline ScaleFactor Entry::scale_factor(const Position& pos, Color c) const {
-
- return !scalingFunction[c] || (*scalingFunction[c])(pos) == SCALE_FACTOR_NONE
- ? ScaleFactor(factor[c]) : (*scalingFunction[c])(pos);
-}
-
-}
-
-#endif // !defined(MATERIAL_H_INCLUDED)
+#endif // #ifndef MATERIAL_H_INCLUDED