/*
Stockfish, a UCI chess playing engine derived from Glaurung 2.1
Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
- Copyright (C) 2008 Marco Costalba
+ Copyright (C) 2008-2010 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 <http://www.gnu.org/licenses/>.
*/
-
#if !defined(MATERIAL_H_INCLUDED)
#define MATERIAL_H_INCLUDED
-////
-//// Includes
-////
-
#include "endgame.h"
#include "position.h"
-#include "scale.h"
+#include "tt.h"
+#include "types.h"
-
-////
-//// Types
-////
+const int MaterialTableSize = 8192;
/// MaterialInfo is a class which contains various information about a
-/// material configuration. It contains a material balance evaluation,
+/// 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.
friend class MaterialInfoTable;
public:
- Value mg_value() const;
- Value eg_value() const;
- ScaleFactor scale_factor(const Position &pos, Color c) const;
+ 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;
-
- static void init();
+ Value evaluate(const Position& pos) const;
private:
- void clear();
-
Key key;
- int16_t mgValue;
- int16_t egValue;
+ int16_t value;
uint8_t factor[2];
- EndgameEvaluationFunction *evaluationFunction;
- ScalingFunction *scalingFunction[2];
+ EndgameBase<Value>* evaluationFunction;
+ EndgameBase<ScaleFactor>* scalingFunction[2];
+ int spaceWeight;
+ Phase gamePhase;
};
-/// 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 {
+/// 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(unsigned numOfEntries);
+ MaterialInfoTable();
~MaterialInfoTable();
- void clear();
- MaterialInfo *get_material_info(const Position &pos);
+ MaterialInfo* get_material_info(const Position& pos) const;
+ static Phase game_phase(const Position& pos);
private:
- unsigned size;
- MaterialInfo *entries;
+ template<Color Us>
+ static int imbalance(const int pieceCount[][8]);
+
+ Endgames* funcs;
};
-////
-//// Inline functions
-////
+/// 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.
-/// MaterialInfo::mg_value and MaterialInfo::eg_value simply returns the
-/// material balance evaluation for the middle game and the endgame.
+inline ScaleFactor MaterialInfo::scale_factor(const Position& pos, Color c) const {
-inline Value MaterialInfo::mg_value() const {
- return Value(mgValue);
-}
+ if (!scalingFunction[c])
+ return ScaleFactor(factor[c]);
-inline Value MaterialInfo::eg_value() const {
- return Value(egValue);
+ ScaleFactor sf = scalingFunction[c]->apply(pos);
+ return sf == SCALE_FACTOR_NONE ? ScaleFactor(factor[c]) : sf;
}
-
-/// 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;
+inline Value MaterialInfo::evaluate(const Position& pos) const {
+ return evaluationFunction->apply(pos);
}
-
-/// 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]);
+inline Score MaterialInfo::material_value() const {
+ return make_score(value, value);
}
+inline int MaterialInfo::space_weight() const {
+ return spaceWeight;
+}
-/// 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 Phase MaterialInfo::game_phase() const {
+ return gamePhase;
+}
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'.
-
-inline Value MaterialInfo::evaluate(const Position &pos) const {
- return evaluationFunction->apply(pos);
-}
-
#endif // !defined(MATERIAL_H_INCLUDED)
projects / stockfish / blobdiff