X-Git-Url: https://git.sesse.net/?p=stockfish;a=blobdiff_plain;f=src%2Fmaterial.h;h=28da59dbf3303ddd0ac1319acd0948669f232948;hp=c99320c6686c909581e1b19ed683c28863967d38;hb=d706ae62d73d90c0f80cdccd58384a347295d549;hpb=fecefbb99cb0147f37d6895765a315f34c935786

diff --git a/src/material.h b/src/material.h
index c99320c6..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) 2008-2010 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
@@ -17,101 +16,56 @@
   along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
-#if !defined(MATERIAL_H_INCLUDED)
+#ifndef MATERIAL_H_INCLUDED
 #define MATERIAL_H_INCLUDED
 
 #include "endgame.h"
+#include "misc.h"
 #include "position.h"
-#include "tt.h"
 #include "types.h"
 
-const int MaterialTableSize = 8192;
+namespace Material {
 
-/// 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.
+/// 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 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]);
+  }
 
-class MaterialInfo {
-
-  friend class MaterialInfoTable;
-
-public:
-  Score material_value() const;
-  ScaleFactor scale_factor(const Position& pos, Color c) const;
-  int space_weight() const;
-  Phase game_phase() const;
-  bool specialized_eval_exists() const;
-  Value evaluate(const Position& pos) const;
-
-private:
   Key key;
-  int16_t value;
-  uint8_t factor[2];
-  EndgameBase<Value>* evaluationFunction;
-  EndgameBase<ScaleFactor>* scalingFunction[2];
-  int spaceWeight;
-  Phase gamePhase;
-};
-
-
-/// The MaterialInfoTable class represents a pawn hash table. The most important
-/// method is get_material_info, which returns a pointer to a MaterialInfo object.
-
-class MaterialInfoTable : public SimpleHash<MaterialInfo, MaterialTableSize> {
-public:
-  ~MaterialInfoTable();
-  void init();
-  MaterialInfo* get_material_info(const Position& pos) const;
-  static Phase game_phase(const Position& pos);
-
-private:
-  template<Color Us>
-  static int imbalance(const int pieceCount[][8]);
-
-  Endgames* funcs;
+  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];
 };
 
+typedef HashTable<Entry, 8192> Table;
 
-/// 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
-/// 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.
-
-inline ScaleFactor MaterialInfo::scale_factor(const Position& pos, Color c) const {
-
-  if (!scalingFunction[c])
-      return ScaleFactor(factor[c]);
-
-  ScaleFactor sf = scalingFunction[c]->apply(pos);
-  return sf == SCALE_FACTOR_NONE ? ScaleFactor(factor[c]) : sf;
-}
-
-inline Value MaterialInfo::evaluate(const Position& pos) const {
-  return evaluationFunction->apply(pos);
-}
-
-inline Score MaterialInfo::material_value() const {
-  return make_score(value, value);
-}
-
-inline int MaterialInfo::space_weight() const {
-  return spaceWeight;
-}
-
-inline Phase MaterialInfo::game_phase() const {
-  return gamePhase;
-}
+Entry* probe(const Position& pos);
 
-inline bool MaterialInfo::specialized_eval_exists() const {
-  return evaluationFunction != NULL;
-}
+} // namespace Material
 
-#endif // !defined(MATERIAL_H_INCLUDED)
+#endif // #ifndef MATERIAL_H_INCLUDED