X-Git-Url: https://git.sesse.net/?p=stockfish;a=blobdiff_plain;f=src%2Fmaterial.h;h=28da59dbf3303ddd0ac1319acd0948669f232948;hp=f05541cc3b24e6fd52c1c9265ce69d09048ecdd6;hb=d706ae62d73d90c0f80cdccd58384a347295d549;hpb=3b315c9adab141830a81afbdff70c18336763e51

diff --git a/src/material.h b/src/material.h
index f05541cc..28da59db 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) 2008-2014 Marco Costalba, Joona Kiiski, Tord Romstad
+  Copyright (C) 2004-2020 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
@@ -28,46 +27,44 @@
 namespace 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; }
+  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 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 for draws with rook pawns and wrong-colored bishops.
-
+  // 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);
+    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<Value>* evaluationFunction;
+  const EndgameBase<ScaleFactor>* scalingFunction[COLOR_NB]; // Could be one for each
+                                                             // side (e.g. KPKP, KBPsK)
+  Score score;
+  int16_t gamePhase;
   uint8_t factor[COLOR_NB];
-  EndgameBase<Value>* evaluationFunction;
-  EndgameBase<ScaleFactor>* scalingFunction[COLOR_NB];
-  Score spaceWeight;
-  Phase gamePhase;
 };
 
 typedef HashTable<Entry, 8192> Table;
 
-Entry* probe(const Position& pos, Table& entries, Endgames& endgames);
+Entry* probe(const Position& pos);
 
 } // namespace Material