pattern3.c

   1 #include <assert.h>
   2 #include <math.h>
   3 #include <stdio.h>
   4 #include <stdlib.h>
   5
   6 #include "board.h"
   7 #include "debug.h"
   8 #include "pattern3.h"
   9 #include "tactics.h"
  10
  11
  12 static void
  13 pattern_record(char *table, char *str, int pat, int fixed_color)
  14 {
  15         /* Original color assignment */
  16         table[pat] = fixed_color ? fixed_color : 3;
  17         //fprintf(stderr, "[%s] %04x %d\n", str, pat, fixed_color);
  18
  19         /* Reverse color assignment */
  20         table[pattern3_reverse(pat)] = fixed_color ? 2 - (fixed_color == 2) : 3;
  21         //fprintf(stderr, "[%s] %04x %d\n", str, pat, fixed_color);
  22 }
  23
  24 static int
  25 pat_vmirror(int pat)
  26 {
  27         /* V mirror pattern; reverse order of 3-2-3 chunks */
  28         return ((pat & 0xfc00) >> 10) | (pat & 0x03c0) | ((pat & 0x003f) << 10);
  29 }
  30
  31 static int
  32 pat_hmirror(int pat)
  33 {
  34         /* H mirror pattern; reverse order of 2-bit values within the chunks */
  35 #define rev3(p) ((p >> 4) | (p & 0xc) | ((p & 0x3) << 4))
  36 #define rev2(p) ((p >> 2) | ((p & 0x3) << 2))
  37         return (rev3((pat & 0xfc00) >> 10) << 10)
  38                 | (rev2((pat & 0x03c0) >> 6) << 6)
  39                 | rev3((pat & 0x003f));
  40 #undef rev3
  41 #undef rev2
  42 }
  43
  44 static int
  45 pat_90rot(int pat)
  46 {
  47         /* Rotate by 90 degrees:
  48          * 5 6 7    7 4 2
  49          * 3   4 -> 6   1
  50          * 0 1 2    5 3 0 */
  51         /* I'm too lazy to optimize this :) */
  52         int vals[8];
  53         for (int i = 0; i < 8; i++)
  54                 vals[i] = (pat >> (i * 2)) & 0x3;
  55         int vals2[8];
  56         vals2[0] = vals[5]; vals2[1] = vals[3]; vals2[2] = vals[0];
  57         vals2[3] = vals[6];                     vals2[4] = vals[1];
  58         vals2[5] = vals[7]; vals2[6] = vals[4]; vals2[7] = vals[2];
  59         int p2 = 0;
  60         for (int i = 0; i < 8; i++)
  61                 p2 |= vals2[i] << (i * 2);
  62         return p2;
  63 }
  64
  65 void
  66 pattern3_transpose(int pat, int (*transp)[8])
  67 {
  68         int i = 0;
  69         (*transp)[i++] = pat;
  70         (*transp)[i++] = pat_vmirror(pat);
  71         (*transp)[i++] = pat_hmirror(pat);
  72         (*transp)[i++] = pat_vmirror(pat_hmirror(pat));
  73         (*transp)[i++] = pat_90rot(pat);
  74         (*transp)[i++] = pat_90rot(pat_vmirror(pat));
  75         (*transp)[i++] = pat_90rot(pat_hmirror(pat));
  76         (*transp)[i++] = pat_90rot(pat_vmirror(pat_hmirror(pat)));
  77 }
  78
  79 static void
  80 pattern_gen(struct pattern3s *p, int pat, char *src, int srclen, int fixed_color)
  81 {
  82         for (; srclen > 0; src++, srclen--) {
  83                 if (srclen == 5)
  84                         continue;
  85                 int patofs = (srclen > 5 ? srclen - 1 : srclen) - 1;
  86                 switch (*src) {
  87                         case '?':
  88                                 *src = '.'; pattern_gen(p, pat, src, srclen, fixed_color);
  89                                 *src = 'X'; pattern_gen(p, pat, src, srclen, fixed_color);
  90                                 *src = 'O'; pattern_gen(p, pat, src, srclen, fixed_color);
  91                                 *src = '#'; pattern_gen(p, pat, src, srclen, fixed_color);
  92                                 *src = '?'; // for future recursions
  93                                 return;
  94                         case 'x':
  95                                 *src = '.'; pattern_gen(p, pat, src, srclen, fixed_color);
  96                                 *src = 'O'; pattern_gen(p, pat, src, srclen, fixed_color);
  97                                 *src = '#'; pattern_gen(p, pat, src, srclen, fixed_color);
  98                                 *src = 'x'; // for future recursions
  99                                 return;
 100                         case 'o':
 101                                 *src = '.'; pattern_gen(p, pat, src, srclen, fixed_color);
 102                                 *src = 'X'; pattern_gen(p, pat, src, srclen, fixed_color);
 103                                 *src = '#'; pattern_gen(p, pat, src, srclen, fixed_color);
 104                                 *src = 'o'; // for future recursions
 105                                 return;
 106                         case '.': /* 0 */ break;
 107                         case 'X': pat |= S_BLACK << (patofs * 2); break;
 108                         case 'O': pat |= S_WHITE << (patofs * 2); break;
 109                         case '#': pat |= S_OFFBOARD << (patofs * 2); break;
 110                 }
 111         }
 112
 113         /* Original pattern, all transpositions and rotations */
 114         int transp[8];
 115         pattern3_transpose(pat, &transp);
 116         for (int i = 0; i < 8; i++)
 117                 pattern_record(p->hash, src - 9, transp[i], fixed_color);
 118 }
 119
 120 static void
 121 patterns_gen(struct pattern3s *p, char src[][11], int src_n)
 122 {
 123         for (int i = 0; i < src_n; i++) {
 124                 //printf("<%s>\n", src[i]);
 125                 int fixed_color = 0;
 126                 switch (src[i][9]) {
 127                         case 'X': fixed_color = S_BLACK; break;
 128                         case 'O': fixed_color = S_WHITE; break;
 129                 }
 130                 //fprintf(stderr, "** %s **\n", src[i]);
 131                 pattern_gen(p, 0, src[i], 9, fixed_color);
 132         }
 133 }
 134
 135 static bool
 136 patterns_load(char src[][11], int src_n, char *filename)
 137 {
 138         FILE *f = fopen("moggy.patterns", "r");
 139         if (!f) return false;
 140
 141         int i;
 142         for (i = 0; i < src_n; i++) {
 143                 char line[32];
 144                 if (!fgets(line, sizeof(line), f))
 145                         goto error;
 146                 int l = strlen(line);
 147                 if (l != 10 + (line[l - 1] == '\n'))
 148                         goto error;
 149                 memcpy(src[i], line, 10);
 150         }
 151         fprintf(stderr, "moggy.patterns: %d patterns loaded\n", i);
 152         fclose(f);
 153         return true;
 154 error:
 155         fprintf(stderr, "Error loading moggy.patterns.\n");
 156         fclose(f);
 157         return false;
 158 }
 159
 160 void
 161 pattern3s_init(struct pattern3s *p, char src[][11], int src_n)
 162 {
 163         char nsrc[src_n][11];
 164
 165         if (!patterns_load(nsrc, src_n, "moggy.patterns")) {
 166                 /* Use default pattern set. */
 167                 for (int i = 0; i < src_n; i++)
 168                         strcpy(nsrc[i], src[i]);
 169         }
 170
 171         patterns_gen(p, nsrc, src_n);
 172 }