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
  10
  11 static void
  12 pattern_record(char *table, char *str, hash3_t pat, int fixed_color)
  13 {
  14         /* Original color assignment */
  15         table[pat] = fixed_color ? fixed_color : 3;
  16         //fprintf(stderr, "[%s] %04x %d\n", str, pat, fixed_color);
  17
  18         /* Reverse color assignment */
  19         table[pattern3_reverse(pat)] = fixed_color ? 2 - (fixed_color == 2) : 3;
  20         //fprintf(stderr, "[%s] %04x %d\n", str, pat, fixed_color);
  21 }
  22
  23 static int
  24 pat_vmirror(hash3_t pat)
  25 {
  26         /* V mirror pattern; reverse order of 3-2-3 chunks */
  27         return ((pat & 0xfc00) >> 10) | (pat & 0x03c0) | ((pat & 0x003f) << 10);
  28 }
  29
  30 static int
  31 pat_hmirror(hash3_t pat)
  32 {
  33         /* H mirror pattern; reverse order of 2-bit values within the chunks */
  34 #define rev3(p) ((p >> 4) | (p & 0xc) | ((p & 0x3) << 4))
  35 #define rev2(p) ((p >> 2) | ((p & 0x3) << 2))
  36         return (rev3((pat & 0xfc00) >> 10) << 10)
  37                 | (rev2((pat & 0x03c0) >> 6) << 6)
  38                 | rev3((pat & 0x003f));
  39 #undef rev3
  40 #undef rev2
  41 }
  42
  43 static int
  44 pat_90rot(hash3_t pat)
  45 {
  46         /* Rotate by 90 degrees:
  47          * 5 6 7    7 4 2
  48          * 3   4 -> 6   1
  49          * 0 1 2    5 3 0 */
  50         /* I'm too lazy to optimize this :) */
  51         int vals[8];
  52         for (int i = 0; i < 8; i++)
  53                 vals[i] = (pat >> (i * 2)) & 0x3;
  54         int vals2[8];
  55         vals2[0] = vals[5]; vals2[1] = vals[3]; vals2[2] = vals[0];
  56         vals2[3] = vals[6];                     vals2[4] = vals[1];
  57         vals2[5] = vals[7]; vals2[6] = vals[4]; vals2[7] = vals[2];
  58         int p2 = 0;
  59         for (int i = 0; i < 8; i++)
  60                 p2 |= vals2[i] << (i * 2);
  61         return p2;
  62 }
  63
  64 void
  65 pattern3_transpose(hash3_t pat, hash3_t (*transp)[8])
  66 {
  67         int i = 0;
  68         (*transp)[i++] = pat;
  69         (*transp)[i++] = pat_vmirror(pat);
  70         (*transp)[i++] = pat_hmirror(pat);
  71         (*transp)[i++] = pat_vmirror(pat_hmirror(pat));
  72         (*transp)[i++] = pat_90rot(pat);
  73         (*transp)[i++] = pat_90rot(pat_vmirror(pat));
  74         (*transp)[i++] = pat_90rot(pat_hmirror(pat));
  75         (*transp)[i++] = pat_90rot(pat_vmirror(pat_hmirror(pat)));
  76 }
  77
  78 static void
  79 pattern_gen(struct pattern3s *p, hash3_t pat, char *src, int srclen, int fixed_color)
  80 {
  81         for (; srclen > 0; src++, srclen--) {
  82                 if (srclen == 5)
  83                         continue;
  84                 int patofs = (srclen > 5 ? srclen - 1 : srclen) - 1;
  85                 switch (*src) {
  86                         case '?':
  87                                 *src = '.'; pattern_gen(p, pat, src, srclen, fixed_color);
  88                                 *src = 'X'; pattern_gen(p, pat, src, srclen, fixed_color);
  89                                 *src = 'O'; pattern_gen(p, pat, src, srclen, fixed_color);
  90                                 *src = '#'; pattern_gen(p, pat, src, srclen, fixed_color);
  91                                 *src = '?'; // for future recursions
  92                                 return;
  93                         case 'x':
  94                                 *src = '.'; pattern_gen(p, pat, src, srclen, fixed_color);
  95                                 *src = 'O'; pattern_gen(p, pat, src, srclen, fixed_color);
  96                                 *src = '#'; pattern_gen(p, pat, src, srclen, fixed_color);
  97                                 *src = 'x'; // for future recursions
  98                                 return;
  99                         case 'o':
 100                                 *src = '.'; pattern_gen(p, pat, src, srclen, fixed_color);
 101                                 *src = 'X'; pattern_gen(p, pat, src, srclen, fixed_color);
 102                                 *src = '#'; pattern_gen(p, pat, src, srclen, fixed_color);
 103                                 *src = 'o'; // for future recursions
 104                                 return;
 105                         case '.': /* 0 */ break;
 106                         case 'X': pat |= S_BLACK << (patofs * 2); break;
 107                         case 'O': pat |= S_WHITE << (patofs * 2); break;
 108                         case '#': pat |= S_OFFBOARD << (patofs * 2); break;
 109                 }
 110         }
 111
 112         /* Original pattern, all transpositions and rotations */
 113         hash3_t transp[8];
 114         pattern3_transpose(pat, &transp);
 115         for (int i = 0; i < 8; i++)
 116                 pattern_record(p->hash, src - 9, transp[i], fixed_color);
 117 }
 118
 119 static void
 120 patterns_gen(struct pattern3s *p, char src[][11], int src_n)
 121 {
 122         for (int i = 0; i < src_n; i++) {
 123                 //printf("<%s>\n", src[i]);
 124                 int fixed_color = 0;
 125                 switch (src[i][9]) {
 126                         case 'X': fixed_color = S_BLACK; break;
 127                         case 'O': fixed_color = S_WHITE; break;
 128                 }
 129                 //fprintf(stderr, "** %s **\n", src[i]);
 130                 pattern_gen(p, 0, src[i], 9, fixed_color);
 131         }
 132 }
 133
 134 static bool
 135 patterns_load(char src[][11], int src_n, char *filename)
 136 {
 137         FILE *f = fopen("moggy.patterns", "r");
 138         if (!f) return false;
 139
 140         int i;
 141         for (i = 0; i < src_n; i++) {
 142                 char line[32];
 143                 if (!fgets(line, sizeof(line), f))
 144                         goto error;
 145                 int l = strlen(line);
 146                 if (l != 10 + (line[l - 1] == '\n'))
 147                         goto error;
 148                 memcpy(src[i], line, 10);
 149         }
 150         fprintf(stderr, "moggy.patterns: %d patterns loaded\n", i);
 151         fclose(f);
 152         return true;
 153 error:
 154         fprintf(stderr, "Error loading moggy.patterns.\n");
 155         fclose(f);
 156         return false;
 157 }
 158
 159 void
 160 pattern3s_init(struct pattern3s *p, char src[][11], int src_n)
 161 {
 162         char nsrc[src_n][11];
 163
 164         if (!patterns_load(nsrc, src_n, "moggy.patterns")) {
 165                 /* Use default pattern set. */
 166                 for (int i = 0; i < src_n; i++)
 167                         strcpy(nsrc[i], src[i]);
 168         }
 169
 170         patterns_gen(p, nsrc, src_n);
 171 }