bdinit.c revision 1.16
1 /* $NetBSD: bdinit.c,v 1.16 2022/05/18 22:35:13 rillig Exp $ */ 2 3 /* 4 * Copyright (c) 1994 5 * The Regents of the University of California. All rights reserved. 6 * 7 * This code is derived from software contributed to Berkeley by 8 * Ralph Campbell. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 */ 34 35 #include <sys/cdefs.h> 36 #ifndef lint 37 #if 0 38 static char sccsid[] = "from: @(#)bdinit.c 8.2 (Berkeley) 5/3/95"; 39 #else 40 __RCSID("$NetBSD: bdinit.c,v 1.16 2022/05/18 22:35:13 rillig Exp $"); 41 #endif 42 #endif /* not lint */ 43 44 #include <string.h> 45 #include "gomoku.h" 46 47 static void init_overlap(void); 48 49 void 50 bdinit(struct spotstr *bp) 51 { 52 struct spotstr *sp; 53 struct combostr *cbp; 54 55 movenum = 1; 56 57 /* mark the borders as such */ 58 sp = bp; 59 for (int i = 1 + BSZ + 1; --i >= 0; sp++) { 60 sp->s_occ = BORDER; /* top border */ 61 sp->s_flags = BFLAGALL; 62 } 63 64 /* fill entire board with EMPTY spots */ 65 memset(frames, 0, sizeof(frames)); 66 cbp = frames; 67 for (int j = 0; ++j < BSZ + 1; sp++) { /* for each row */ 68 for (int i = 0; ++i < BSZ + 1; sp++) { /* for each column */ 69 sp->s_occ = EMPTY; 70 sp->s_flags = 0; 71 sp->s_wval = 0; 72 if (j < 5) { 73 /* directions 1, 2, 3 are blocked */ 74 sp->s_flags |= (BFLAG << 1) | (BFLAG << 2) | 75 (BFLAG << 3); 76 sp->s_fval[BLACK][1].s = MAXCOMBO; 77 sp->s_fval[BLACK][2].s = MAXCOMBO; 78 sp->s_fval[BLACK][3].s = MAXCOMBO; 79 sp->s_fval[WHITE][1].s = MAXCOMBO; 80 sp->s_fval[WHITE][2].s = MAXCOMBO; 81 sp->s_fval[WHITE][3].s = MAXCOMBO; 82 } else if (j == 5) { 83 /* five spaces, blocked on one side */ 84 sp->s_fval[BLACK][1].s = 0x500; 85 sp->s_fval[BLACK][2].s = 0x500; 86 sp->s_fval[BLACK][3].s = 0x500; 87 sp->s_fval[WHITE][1].s = 0x500; 88 sp->s_fval[WHITE][2].s = 0x500; 89 sp->s_fval[WHITE][3].s = 0x500; 90 } else { 91 /* six spaces, not blocked */ 92 sp->s_fval[BLACK][1].s = 0x401; 93 sp->s_fval[BLACK][2].s = 0x401; 94 sp->s_fval[BLACK][3].s = 0x401; 95 sp->s_fval[WHITE][1].s = 0x401; 96 sp->s_fval[WHITE][2].s = 0x401; 97 sp->s_fval[WHITE][3].s = 0x401; 98 } 99 if (i > (BSZ - 4)) { 100 /* directions 0, 1 are blocked */ 101 sp->s_flags |= BFLAG | (BFLAG << 1); 102 sp->s_fval[BLACK][0].s = MAXCOMBO; 103 sp->s_fval[BLACK][1].s = MAXCOMBO; 104 sp->s_fval[WHITE][0].s = MAXCOMBO; 105 sp->s_fval[WHITE][1].s = MAXCOMBO; 106 } else if (i == (BSZ - 4)) { 107 sp->s_fval[BLACK][0].s = 0x500; 108 sp->s_fval[WHITE][0].s = 0x500; 109 /* if direction 1 is not blocked */ 110 if ((sp->s_flags & (BFLAG << 1)) == 0) { 111 sp->s_fval[BLACK][1].s = 0x500; 112 sp->s_fval[WHITE][1].s = 0x500; 113 } 114 } else { 115 sp->s_fval[BLACK][0].s = 0x401; 116 sp->s_fval[WHITE][0].s = 0x401; 117 if (i < 5) { 118 /* direction 3 is blocked */ 119 sp->s_flags |= (BFLAG << 3); 120 sp->s_fval[BLACK][3].s = MAXCOMBO; 121 sp->s_fval[WHITE][3].s = MAXCOMBO; 122 } else if (i == 5 && 123 (sp->s_flags & (BFLAG << 3)) == 0) { 124 sp->s_fval[BLACK][3].s = 0x500; 125 sp->s_fval[WHITE][3].s = 0x500; 126 } 127 } 128 /* 129 * Allocate a frame structure for non-blocked frames. 130 */ 131 for (int r = 4; --r >= 0; ) { 132 if ((sp->s_flags & (BFLAG << r)) != 0) 133 continue; 134 cbp->c_combo.s = sp->s_fval[BLACK][r].s; 135 cbp->c_vertex = (u_short)(sp - board); 136 cbp->c_nframes = 1; 137 cbp->c_dir = r; 138 sp->s_frame[r] = cbp; 139 cbp++; 140 } 141 } 142 sp->s_occ = BORDER; /* left & right border */ 143 sp->s_flags = BFLAGALL; 144 } 145 146 /* mark the borders as such */ 147 for (int i = BSZ + 1; --i >= 0; sp++) { 148 sp->s_occ = BORDER; /* bottom border */ 149 sp->s_flags = BFLAGALL; 150 } 151 152 sortframes[BLACK] = (struct combostr *)0; 153 sortframes[WHITE] = (struct combostr *)0; 154 init_overlap(); 155 } 156 157 /* 158 * Initialize the overlap array. 159 * Each entry in the array is a bit mask with eight bits corresponding 160 * to whether frame B overlaps frame A (as indexed by overlap[A * FAREA + B]). 161 * The eight bits correspond to whether A and B are open-ended (length 6) or 162 * closed (length 5). 163 * 0 A closed and B closed 164 * 1 A closed and B open 165 * 2 A open and B closed 166 * 3 A open and B open 167 * 4 A closed and B closed and overlaps in more than one spot 168 * 5 A closed and B open and overlaps in more than one spot 169 * 6 A open and B closed and overlaps in more than one spot 170 * 7 A open and B open and overlaps in more than one spot 171 * As pieces are played, it can make frames not overlap if there are no 172 * common open spaces shared between the two frames. 173 */ 174 static void 175 init_overlap(void) 176 { 177 178 memset(overlap, 0, sizeof(overlap)); 179 memset(intersect, 0, sizeof(intersect)); 180 u_char *op = &overlap[FAREA * FAREA]; 181 short *ip = &intersect[FAREA * FAREA]; 182 183 for (unsigned fi = FAREA; fi-- > 0; ) { /* each frame */ 184 struct combostr *cbp = &frames[fi]; 185 op -= FAREA; 186 ip -= FAREA; 187 int vertex = cbp->c_vertex; 188 struct spotstr *sp1 = &board[vertex]; 189 int d1 = dd[cbp->c_dir]; 190 /* 191 * s = 5 if closed, 6 if open. 192 * At this point black & white are the same. 193 */ 194 int s = 5 + sp1->s_fval[BLACK][cbp->c_dir].c.b; 195 /* for each spot in frame A */ 196 for (int i = 0; i < s; i++, sp1 += d1, vertex += d1) { 197 /* the sixth spot in frame A only overlaps if it is open */ 198 int mask = (i == 5) ? 0xC : 0xF; 199 /* for each direction */ 200 for (int r = 4; --r >= 0; ) { 201 struct spotstr *sp2 = sp1; 202 int d2 = dd[r]; 203 /* for each frame that intersects at spot sp1 */ 204 for (int f = 0; f < 6; f++, sp2 -= d2) { 205 if (sp2->s_occ == BORDER) 206 break; 207 if ((sp2->s_flags & BFLAG << r) != 0) 208 continue; 209 int n = (int)(sp2->s_frame[r] - frames); 210 ip[n] = (short)vertex; 211 op[n] |= (f == 5) ? mask & 0xA : mask; 212 if (r == cbp->c_dir) { 213 /* compute the multiple spot overlap values */ 214 switch (i) { 215 case 0: /* sp1 is the first spot in A */ 216 if (f == 4) 217 op[n] |= 0xA0; 218 else if (f != 5) 219 op[n] |= 0xF0; 220 break; 221 case 1: /* sp1 is the second spot in A */ 222 if (f == 5) 223 op[n] |= 0xA0; 224 else 225 op[n] |= 0xF0; 226 break; 227 case 4: /* sp1 is the penultimate spot in A */ 228 if (f == 0) 229 op[n] |= 0xC0; 230 else 231 op[n] |= 0xF0; 232 break; 233 case 5: /* sp1 is the last spot in A */ 234 if (f == 1) 235 op[n] |= 0xC0; 236 else if (f != 0) 237 op[n] |= 0xF0; 238 break; 239 default: 240 op[n] |= 0xF0; 241 } 242 } 243 } 244 } 245 } 246 } 247 } 248
Indexes created Tue Sep 30 10:09:55 GMT 2025