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(struct pattern3s *p, char *str, hash3_t pat, int fixed_color)
  13 {
  14         p->hash[pat] = fixed_color ? fixed_color : 3;
  15         //fprintf(stderr, "[%s] %04x %d\n", str, pat, fixed_color);
  16 }
  17
  18 static int
  19 pat_vmirror(hash3_t pat)
  20 {
  21         /* V mirror pattern; reverse order of 3-2-3 chunks */
  22         return ((pat & 0xfc00) >> 10) | (pat & 0x03c0) | ((pat & 0x003f) << 10);
  23 }
  24
  25 static int
  26 pat_hmirror(hash3_t pat)
  27 {
  28         /* H mirror pattern; reverse order of 2-bit values within the chunks */
  29 #define rev3(p) ((p >> 4) | (p & 0xc) | ((p & 0x3) << 4))
  30 #define rev2(p) ((p >> 2) | ((p & 0x3) << 2))
  31         return (rev3((pat & 0xfc00) >> 10) << 10)
  32                 | (rev2((pat & 0x03c0) >> 6) << 6)
  33                 | rev3((pat & 0x003f));
  34 #undef rev3
  35 #undef rev2
  36 }
  37
  38 static int
  39 pat_90rot(hash3_t pat)
  40 {
  41         /* Rotate by 90 degrees:
  42          * 5 6 7    7 4 2
  43          * 3   4 -> 6   1
  44          * 0 1 2    5 3 0 */
  45         /* I'm too lazy to optimize this :) */
  46         int vals[8];
  47         for (int i = 0; i < 8; i++)
  48                 vals[i] = (pat >> (i * 2)) & 0x3;
  49         int vals2[8];
  50         vals2[0] = vals[5]; vals2[1] = vals[3]; vals2[2] = vals[0];
  51         vals2[3] = vals[6];                     vals2[4] = vals[1];
  52         vals2[5] = vals[7]; vals2[6] = vals[4]; vals2[7] = vals[2];
  53         int p2 = 0;
  54         for (int i = 0; i < 8; i++)
  55                 p2 |= vals2[i] << (i * 2);
  56         return p2;
  57 }
  58
  59 void
  60 pattern3_transpose(hash3_t pat, hash3_t (*transp)[8])
  61 {
  62         int i = 0;
  63         (*transp)[i++] = pat;
  64         (*transp)[i++] = pat_vmirror(pat);
  65         (*transp)[i++] = pat_hmirror(pat);
  66         (*transp)[i++] = pat_vmirror(pat_hmirror(pat));
  67         (*transp)[i++] = pat_90rot(pat);
  68         (*transp)[i++] = pat_90rot(pat_vmirror(pat));
  69         (*transp)[i++] = pat_90rot(pat_hmirror(pat));
  70         (*transp)[i++] = pat_90rot(pat_vmirror(pat_hmirror(pat)));
  71 }
  72
  73 static void
  74 pattern_gen(struct pattern3s *p, hash3_t pat, char *src, int srclen, int fixed_color)
  75 {
  76         for (; srclen > 0; src++, srclen--) {
  77                 if (srclen == 5)
  78                         continue;
  79                 int patofs = (srclen > 5 ? srclen - 1 : srclen) - 1;
  80                 switch (*src) {
  81                         case '?':
  82                                 *src = '.'; pattern_gen(p, pat, src, srclen, fixed_color);
  83                                 *src = 'X'; pattern_gen(p, pat, src, srclen, fixed_color);
  84                                 *src = 'O'; pattern_gen(p, pat, src, srclen, fixed_color);
  85                                 *src = '#'; pattern_gen(p, pat, src, srclen, fixed_color);
  86                                 *src = '?'; // for future recursions
  87                                 return;
  88                         case 'x':
  89                                 *src = '.'; 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 = 'x'; // for future recursions
  93                                 return;
  94                         case 'o':
  95                                 *src = '.'; pattern_gen(p, pat, src, srclen, fixed_color);
  96                                 *src = 'X'; pattern_gen(p, pat, src, srclen, fixed_color);
  97                                 *src = '#'; pattern_gen(p, pat, src, srclen, fixed_color);
  98                                 *src = 'o'; // for future recursions
  99                                 return;
 100                         case '.': /* 0 */ break;
 101                         case 'X': pat |= S_BLACK << (patofs * 2); break;
 102                         case 'O': pat |= S_WHITE << (patofs * 2); break;
 103                         case '#': pat |= S_OFFBOARD << (patofs * 2); break;
 104                 }
 105         }
 106
 107         /* Original pattern, all transpositions and rotations */
 108         hash3_t transp[8];
 109         pattern3_transpose(pat, &transp);
 110         for (int i = 0; i < 8; i++) {
 111                 /* Original color assignment */
 112                 pattern_record(p, src - 9, transp[i], fixed_color);
 113                 /* Reverse color assignment */
 114                 if (fixed_color)
 115                         fixed_color = 2 - (fixed_color == 2);
 116                 pattern_record(p, src - 9, pattern3_reverse(transp[i]), fixed_color);
 117         }
 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 }