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Better board_init, implement basic castling in unmake

This commit is contained in:
Quinten Kock 2020-06-18 20:47:11 +02:00
parent e69fd01b66
commit 36a4ff5676
1 changed files with 45 additions and 21 deletions
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66
Board.h
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@ -16,21 +16,11 @@
B_ROOK, B_KNGT, B_BSHP, B_QUEN, B_KING, B_BSHP, B_KNGT, B_ROOK, 0, 0, 0, 0, 0, 0, 0, 0, \
};
byte field[128];
const byte field_default_value[] PROGMEM = BOARD_DEFAULT_VALUE;
void board_init() {
for(int i = 0; i < 128; i++) {
field[i] = pgm_read_byte_near(field_default_value + i);
}
}
// 0x88-fill definitions
#define PTR_SIDE_AND_CASTLERIGHT 0x08 //byte (1=side, 2,4=white castle, 8,16=black)
// CAN FILL 0x09
#define PTR_W_KING 0x0A // byte (points to index or maybe 64-arr index)
// const byte PTR_B_KING = 0x0B; (PTR_W_KING | COLOR or PTR_W_KING + COLOR)
#define PTR_B_KING 0x0B // (PTR_W_KING | COLOR or PTR_W_KING + COLOR)
#define PTR_ZOBRIST 0x0C // 4 bytes
// 0x0D
// 0x0E
@ -42,11 +32,28 @@ void board_init() {
#define PTR_UNMOVE_START 0x28
#define PTR_UNMOVE_LAST 0x7F
byte field[128];
byte PTR_UNMOVE = PTR_UNMOVE_START;
const byte field_default_value[] PROGMEM = BOARD_DEFAULT_VALUE;
void board_init() {
for(int i = 0; i < 128; i++) {
field[i] = pgm_read_byte_near(field_default_value + i);
}
field[PTR_SIDE_AND_CASTLERIGHT] = 0b11110; // all castle rights allowed, white to move
field[PTR_W_KING] = 0x04; // e1
field[PTR_B_KING] = 0x74; // e8
long* zob = (long*)&field[PTR_ZOBRIST];
*zob = 0xDEADBEEF;
}
struct Unmove {
byte sq_from; // 0b(1unused)(3rank)(1unused)(3file)
byte sq_to; // 0b(1promoted?)(3rank)(1unused)(3file)
byte sq_to; // 0b(1promoted?)(3rank)(1ep_capture?)(3file)
byte captured; // 0b(4enpassantinfo)(1color)(3piecetype)
byte revmov; // 8bit integer
};
@ -117,7 +124,6 @@ void print() {
}
void make(Move m) {
// TODO handle revmov clock
// TODO zobrist?
// fill unmove struct with basic data
@ -136,7 +142,7 @@ void make(Move m) {
}
// Calculate the move 'amount' (unique signature for dx,dy)
int sq_diff = (int)m.sq_from - (int)m.sq_to;
int sq_diff = (int)m.sq_to - (int)m.sq_from;
int sq_diff_abs = abs(sq_diff);
@ -158,17 +164,18 @@ void make(Move m) {
// Handle castling rights
// We are doing the simple way:
// unset it any time a move is made from the original position.
if(m.sq_from == 0x00)
// TODO handle castle rights and unmake
if(m.sq_from == 0x00) // white queenside rook
field[PTR_SIDE_AND_CASTLERIGHT] &= ~0b00010;
if(m.sq_from == 0x07)
if(m.sq_from == 0x07) // white kingside rook
field[PTR_SIDE_AND_CASTLERIGHT] &= ~0b00100;
if(m.sq_from == 0x04)
if(m.sq_from == 0x04) // white king
field[PTR_SIDE_AND_CASTLERIGHT] &= ~0b00110;
if(m.sq_from == 0x70)
if(m.sq_from == 0x70) // black queenside rook
field[PTR_SIDE_AND_CASTLERIGHT] &= ~0b01000;
if(m.sq_from == 0x77)
if(m.sq_from == 0x77) // black kingside rook
field[PTR_SIDE_AND_CASTLERIGHT] &= ~0b10000;
if(m.sq_from == 0x74)
if(m.sq_from == 0x74) // black king
field[PTR_SIDE_AND_CASTLERIGHT] &= ~0b11000;
@ -192,7 +199,7 @@ void make(Move m) {
// handle enpassant setup (double pawn move)
if(
piece_type == W_PAWN &&
(sq_diff_abs == 32)
sq_diff_abs == 32
) {
// we are doing a pawn double-move.
// therefore, it allows enpassant in the next move.
@ -244,6 +251,23 @@ void unmake() {
// also undo the regular move
field[u.sq_from] = field[sq_to];
}
// TODO handle castling rights
int sq_diff = (int)sq_to - (int)u.sq_from;
int sq_diff_abs = abs(sq_diff);
if((field[u.sq_from] & 0x7) == W_KING && sq_diff_abs == 2) {
// we castled
byte castle_source = 0x70*!black_moving();
if(sq_diff == 2) {
castle_source += 0x7;
}
byte castle_target = u.sq_from + (sq_diff/2);
// move rook back to original position
field[castle_source] = field[castle_target];
// and clear where it was put
field[castle_target] = P_EMPTY;
}
field[sq_to] = u.captured & 0b1111;