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/*
This file is part of ct.
This program 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.
This program 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 ct. If not, see <https://www.gnu.org/licenses/>.
*/
#include "zobrist.h"
// ===================================================================
// Variables
// ===================================================================
static uint64_t *zobrist;
// ===================================================================
// Exported method implementations
// ===================================================================
int zobrist_init(void) {
if (zobrist != NULL) return EXIT_FAILURE;
zobrist = malloc(sizeof(uint64_t)*board_size*board_size*(15*2*3));
// TODO: trap errno
for (int k=0; k<board_size*board_size*(15*2*3); k++) {
XORSHIFT64;
zobrist[k] = RANDOM64;
}
return EXIT_SUCCESS;
}
void zobrist_free(void) {
if (zobrist != NULL) {
free(zobrist);
zobrist = NULL;
}
}
uint64_t zobrist_compute(void) {
uint64_t hash = 0;
for (uint8_t l=0; l<board_size*board_size; l++) {
colour_stack_t c = colours[l];
const uint8_t count = COUNT_AT(l);
enum STONE_VARIANT s = STONE_AT(l);
for (uint8_t h=0; h<count; h++, c >>= 1)
hash ^= zobrist[l*(15*2*3)+h*2*3+(c&1)*3+s];
}
return hash;
}
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