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Change evaluation score to a centi-pawn based integer type

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Ole Morud
2026-01-08 18:44:07 +01:00
parent 33a0878f6a
commit e1d1684c23
6 changed files with 218 additions and 170 deletions
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26
engine-types.h
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@@ -1,5 +1,14 @@
#pragma once
/* --- Score16 (centipawns) ---- */
typedef int16_t Score16;
enum {
SCORE_INF = 9999,
SCORE_CHECKMATE = 999,
};
/* ----------- Index8 ----------- */
typedef uint8_t Index8;
@@ -195,13 +204,13 @@ static char const* side_str[SIDE_COUNT] = {
/* https://en.wikipedia.org/wiki/X_macro */
/* enum value white char white unicode black char black unicode */
#define PIECES \
X(PIECE_EMPTY, 0.0f, ' ', ' ', ' ', ' ') \
X(PIECE_PAWN, 1.0f, 'P', 0x2659, 'p', 0x265F) \
X(PIECE_KNIGHT, 3.1f, 'N', 0x2658, 'n', 0x265E) \
X(PIECE_BISHOP, 3.2f, 'B', 0x2657, 'b', 0x265D) \
X(PIECE_ROOK, 5.0f, 'R', 0x2656, 'r', 0x265C) \
X(PIECE_QUEEN, 9.0f, 'Q', 0x2655, 'q', 0x265B) \
X(PIECE_KING, 16.0f, 'K', 0x2654, 'k', 0x265A) \
X(PIECE_EMPTY, 0, ' ', ' ', ' ', ' ') \
X(PIECE_PAWN, 100, 'P', 0x2659, 'p', 0x265F) \
X(PIECE_KNIGHT, 301, 'N', 0x2658, 'n', 0x265E) \
X(PIECE_BISHOP, 302, 'B', 0x2657, 'b', 0x265D) \
X(PIECE_ROOK, 500, 'R', 0x2656, 'r', 0x265C) \
X(PIECE_QUEEN, 900, 'Q', 0x2655, 'q', 0x265B) \
X(PIECE_KING, 1600, 'K', 0x2654, 'k', 0x265A) \
/**/
typedef enum piece : uint8_t {
@@ -213,7 +222,7 @@ typedef enum piece : uint8_t {
#undef X
} Piece8;
static float piece_value[PIECE_COUNT] = {
static Score16 piece_value[PIECE_COUNT] = {
#define X(e, v, wc, wu, bc, bu) [e] = v,
PIECES
#undef X
@@ -259,7 +268,6 @@ static int const piece_unicode[SIDE_COUNT][PIECE_COUNT] = {
}
};
/* ----------- moves ----------- */
enum {