| 1 | greg | 2.1 | #ifndef lint | 
| 2 | greg | 2.17 | static const char RCSid[] = "$Id: srcobstr.c,v 2.16 2011/02/14 20:13:38 greg Exp $"; | 
| 3 | greg | 2.1 | #endif | 
| 4 |  |  | /* | 
| 5 |  |  | * Source occlusion caching routines | 
| 6 |  |  | */ | 
| 7 |  |  |  | 
| 8 |  |  | #include  "ray.h" | 
| 9 |  |  |  | 
| 10 |  |  | #include  "otypes.h" | 
| 11 |  |  |  | 
| 12 |  |  | #include  "otspecial.h" | 
| 13 |  |  |  | 
| 14 | greg | 2.14 | #include  "rtotypes.h" | 
| 15 |  |  |  | 
| 16 | greg | 2.1 | #include  "source.h" | 
| 17 |  |  |  | 
| 18 |  |  | #define ABS(x)  ((x)>0 ? (x) : -(x)) | 
| 19 |  |  |  | 
| 20 |  |  |  | 
| 21 |  |  | #if  SHADCACHE                  /* preemptive shadow checking */ | 
| 22 |  |  |  | 
| 23 |  |  |  | 
| 24 | greg | 2.13 | OBJECT *        antimodlist = NULL;     /* set of clipped materials */ | 
| 25 |  |  |  | 
| 26 |  |  |  | 
| 27 | greg | 2.7 | static int                              /* cast source ray to first blocker */ | 
| 28 | greg | 2.1 | castshadow(int sn, FVECT rorg, FVECT rdir) | 
| 29 |  |  | { | 
| 30 |  |  | RAY     rt; | 
| 31 |  |  |  | 
| 32 |  |  | VCOPY(rt.rorg, rorg); | 
| 33 |  |  | VCOPY(rt.rdir, rdir); | 
| 34 |  |  | rt.rmax = 0; | 
| 35 | greg | 2.12 | rayorigin(&rt, PRIMARY, NULL, NULL); | 
| 36 | greg | 2.7 | /* check for intersection */ | 
| 37 |  |  | while (localhit(&rt, &thescene)) { | 
| 38 |  |  | RAY     rt1 = rt;       /* pretend we were aimed at source */ | 
| 39 |  |  | rt1.crtype |= rt1.rtype = SHADOW; | 
| 40 |  |  | rt1.rdir[0] = -rt.rdir[0]; | 
| 41 |  |  | rt1.rdir[1] = -rt.rdir[1]; | 
| 42 |  |  | rt1.rdir[2] = -rt.rdir[2]; | 
| 43 |  |  | rt1.rod = -rt.rod; | 
| 44 |  |  | VSUB(rt1.rorg, rt.rop, rt.rdir); | 
| 45 |  |  | rt1.rot = 1.; | 
| 46 |  |  | rt1.rsrc = sn; | 
| 47 | greg | 2.1 | /* record blocker */ | 
| 48 | greg | 2.7 | if (srcblocker(&rt1)) | 
| 49 |  |  | return(1); | 
| 50 |  |  | /* move past failed blocker */ | 
| 51 |  |  | VSUM(rt.rorg, rt.rop, rt.rdir, FTINY); | 
| 52 |  |  | rayclear(&rt);          /* & try again... */ | 
| 53 |  |  | } | 
| 54 |  |  | return(0);                      /* found no blockers */ | 
| 55 | greg | 2.1 | } | 
| 56 |  |  |  | 
| 57 |  |  |  | 
| 58 | greg | 2.8 | void                                    /* initialize occlusion cache */ | 
| 59 | greg | 2.1 | initobscache(int sn) | 
| 60 |  |  | { | 
| 61 |  |  | register SRCREC *srcp = &source[sn]; | 
| 62 |  |  | int             cachelen; | 
| 63 |  |  | FVECT           rorg, rdir; | 
| 64 |  |  | RREAL           d; | 
| 65 |  |  | int             i, j, k; | 
| 66 | greg | 2.17 | int             ax=0, ax1=1, ax2=2; | 
| 67 | greg | 2.1 |  | 
| 68 | greg | 2.8 | if (srcp->sflags & (SSKIP|SPROX|SSPOT|SVIRTUAL)) | 
| 69 |  |  | return;                 /* don't cache these */ | 
| 70 | greg | 2.1 | if (srcp->sflags & SDISTANT) | 
| 71 |  |  | cachelen = 4*SHADCACHE*SHADCACHE; | 
| 72 |  |  | else if (srcp->sflags & SFLAT) | 
| 73 |  |  | cachelen = SHADCACHE*SHADCACHE*3 + (SHADCACHE&1)*SHADCACHE*4; | 
| 74 |  |  | else /* spherical distribution */ | 
| 75 |  |  | cachelen = SHADCACHE*SHADCACHE*6; | 
| 76 |  |  | /* allocate cache */ | 
| 77 |  |  | srcp->obscache = (OBSCACHE *)malloc(sizeof(OBSCACHE) + | 
| 78 |  |  | sizeof(OBJECT)*(cachelen-1)); | 
| 79 |  |  | if (srcp->obscache == NULL) | 
| 80 |  |  | error(SYSTEM, "out of memory in initobscache()"); | 
| 81 |  |  | /* set parameters */ | 
| 82 |  |  | if (srcp->sflags & SDISTANT) { | 
| 83 |  |  | RREAL   amax = 0; | 
| 84 |  |  | for (ax1 = 3; ax1--; ) | 
| 85 |  |  | if (ABS(srcp->sloc[ax1]) > amax) { | 
| 86 |  |  | amax = ABS(srcp->sloc[ax1]); | 
| 87 |  |  | ax = ax1; | 
| 88 |  |  | } | 
| 89 |  |  | srcp->obscache->p.d.ax = ax; | 
| 90 |  |  | ax1 = (ax+1)%3; | 
| 91 |  |  | ax2 = (ax+2)%3; | 
| 92 |  |  | VCOPY(srcp->obscache->p.d.o, thescene.cuorg); | 
| 93 |  |  | if (srcp->sloc[ax] > 0) | 
| 94 |  |  | srcp->obscache->p.d.o[ax] += thescene.cusize; | 
| 95 |  |  | if (srcp->sloc[ax1] < 0) | 
| 96 |  |  | srcp->obscache->p.d.o[ax1] += thescene.cusize * | 
| 97 |  |  | srcp->sloc[ax1] / amax; | 
| 98 |  |  | if (srcp->sloc[ax2] < 0) | 
| 99 |  |  | srcp->obscache->p.d.o[ax2] += thescene.cusize * | 
| 100 |  |  | srcp->sloc[ax2] / amax; | 
| 101 |  |  | srcp->obscache->p.d.e1 = 1. / (thescene.cusize*(1. + | 
| 102 |  |  | fabs(srcp->sloc[ax1])/amax)); | 
| 103 |  |  | srcp->obscache->p.d.e2 = 1. / (thescene.cusize*(1. + | 
| 104 |  |  | fabs(srcp->sloc[ax2])/amax)); | 
| 105 |  |  | } else if (srcp->sflags & SFLAT) { | 
| 106 |  |  | VCOPY(srcp->obscache->p.f.u, srcp->ss[SU]); | 
| 107 |  |  | normalize(srcp->obscache->p.f.u); | 
| 108 |  |  | fcross(srcp->obscache->p.f.v, | 
| 109 |  |  | srcp->snorm, srcp->obscache->p.f.u); | 
| 110 |  |  | } | 
| 111 |  |  | /* clear cache */ | 
| 112 |  |  | for (i = cachelen; i--; ) | 
| 113 |  |  | srcp->obscache->obs[i] = OVOID; | 
| 114 |  |  | /* cast shadow rays */ | 
| 115 |  |  | if (srcp->sflags & SDISTANT) { | 
| 116 |  |  | for (k = 3; k--; ) | 
| 117 |  |  | rdir[k] = -srcp->sloc[k]; | 
| 118 |  |  | for (i = 2*SHADCACHE; i--; ) | 
| 119 |  |  | for (j = 2*SHADCACHE; j--; ) { | 
| 120 |  |  | VCOPY(rorg, srcp->obscache->p.d.o); | 
| 121 |  |  | rorg[ax1] += (i+.5) / | 
| 122 |  |  | (2*SHADCACHE*srcp->obscache->p.d.e1); | 
| 123 |  |  | rorg[ax2] += (j+.5) / | 
| 124 |  |  | (2*SHADCACHE*srcp->obscache->p.d.e2); | 
| 125 |  |  | castshadow(sn, rorg, rdir); | 
| 126 |  |  | } | 
| 127 |  |  | } else if (srcp->sflags & SFLAT) { | 
| 128 |  |  | d = 0.01*srcp->srad; | 
| 129 |  |  | VSUM(rorg, srcp->sloc, srcp->snorm, d); | 
| 130 |  |  | for (i = SHADCACHE; i--; ) | 
| 131 |  |  | for (j = SHADCACHE; j--; ) { | 
| 132 |  |  | d = 2./SHADCACHE*(i+.5) - 1.; | 
| 133 |  |  | VSUM(rdir, srcp->snorm, | 
| 134 |  |  | srcp->obscache->p.f.u, d); | 
| 135 |  |  | d = 2./SHADCACHE*(j+.5) - 1.; | 
| 136 |  |  | VSUM(rdir, rdir, srcp->obscache->p.f.v, d); | 
| 137 |  |  | normalize(rdir); | 
| 138 |  |  | castshadow(sn, rorg, rdir); | 
| 139 |  |  | } | 
| 140 |  |  | for (k = 2; k--; ) | 
| 141 |  |  | for (i = SHADCACHE; i--; ) | 
| 142 |  |  | for (j = SHADCACHE>>1; j--; ) { | 
| 143 |  |  | d = 2./SHADCACHE*(i+.5) - 1.; | 
| 144 |  |  | if (k) | 
| 145 |  |  | VSUM(rdir, srcp->obscache->p.f.u, | 
| 146 |  |  | srcp->obscache->p.f.v, d); | 
| 147 |  |  | else | 
| 148 |  |  | VSUM(rdir, srcp->obscache->p.f.v, | 
| 149 |  |  | srcp->obscache->p.f.u, d); | 
| 150 | greg | 2.3 | d = 1. - 2./SHADCACHE*(j+.5); | 
| 151 | greg | 2.1 | VSUM(rdir, rdir, srcp->snorm, d); | 
| 152 |  |  | normalize(rdir); | 
| 153 |  |  | castshadow(sn, rorg, rdir); | 
| 154 |  |  | d = 2.*DOT(rdir, srcp->snorm); | 
| 155 |  |  | rdir[0] = d*srcp->snorm[0] - rdir[0]; | 
| 156 |  |  | rdir[1] = d*srcp->snorm[1] - rdir[1]; | 
| 157 |  |  | rdir[2] = d*srcp->snorm[2] - rdir[2]; | 
| 158 |  |  | castshadow(sn, rorg, rdir); | 
| 159 |  |  | } | 
| 160 |  |  | } else /* spherical distribution */ | 
| 161 |  |  | for (k = 6; k--; ) { | 
| 162 |  |  | ax = k%3; | 
| 163 |  |  | ax1 = (k+1)%3; | 
| 164 |  |  | ax2 = (k+2)%3; | 
| 165 |  |  | for (i = SHADCACHE; i--; ) | 
| 166 |  |  | for (j = SHADCACHE; j--; ) { | 
| 167 |  |  | rdir[0]=rdir[1]=rdir[2] = 0.; | 
| 168 |  |  | rdir[ax] = k<3 ? 1. : -1.; | 
| 169 |  |  | rdir[ax1] = 2./SHADCACHE*(i+.5) - 1.; | 
| 170 |  |  | rdir[ax2] = 2./SHADCACHE*(j+.5) - 1.; | 
| 171 |  |  | normalize(rdir); | 
| 172 |  |  | d = 1.05*srcp->srad; | 
| 173 |  |  | VSUM(rorg, srcp->sloc, rdir, d); | 
| 174 |  |  | castshadow(sn, rorg, rdir); | 
| 175 |  |  | } | 
| 176 |  |  | } | 
| 177 |  |  | } | 
| 178 |  |  |  | 
| 179 |  |  |  | 
| 180 |  |  | static OBJECT *                 /* return occluder cache entry */ | 
| 181 |  |  | srcobstructp(register RAY *r) | 
| 182 |  |  | { | 
| 183 | greg | 2.15 | static RNUMBER  lastrno = ~0; | 
| 184 | greg | 2.1 | static OBJECT   noobs; | 
| 185 | greg | 2.6 | static OBJECT   *lastobjp; | 
| 186 | greg | 2.1 | SRCREC          *srcp; | 
| 187 |  |  | int             ondx; | 
| 188 |  |  |  | 
| 189 | greg | 2.6 | noobs = OVOID; | 
| 190 |  |  | if (r->rno == lastrno) | 
| 191 |  |  | return lastobjp;        /* just recall last pointer */ | 
| 192 | greg | 2.1 | DCHECK(r->rsrc < 0, CONSISTENCY, | 
| 193 |  |  | "srcobstructp() called with unaimed ray"); | 
| 194 | greg | 2.6 | lastrno = r->rno; | 
| 195 |  |  | lastobjp = &noobs; | 
| 196 | greg | 2.1 | srcp = &source[r->rsrc]; | 
| 197 |  |  | if (srcp->sflags & (SSKIP|SPROX|SSPOT|SVIRTUAL)) | 
| 198 |  |  | return(&noobs);         /* don't cache these */ | 
| 199 |  |  | if (srcp->obscache == NULL)     /* initialize cache */ | 
| 200 |  |  | initobscache(r->rsrc); | 
| 201 |  |  | /* compute cache index */ | 
| 202 |  |  | if (srcp->sflags & SDISTANT) { | 
| 203 | greg | 2.17 | int     ax=0, ax1=1, ax2=2; | 
| 204 | greg | 2.1 | double  t; | 
| 205 |  |  | ax = srcp->obscache->p.d.ax; | 
| 206 |  |  | if ((ax1 = ax+1) >= 3) ax1 -= 3; | 
| 207 |  |  | if ((ax2 = ax+2) >= 3) ax2 -= 3; | 
| 208 |  |  | t = (srcp->obscache->p.d.o[ax] - r->rorg[ax]) / srcp->sloc[ax]; | 
| 209 |  |  | if (t <= FTINY) | 
| 210 |  |  | return(&noobs); /* could happen if ray is outside */ | 
| 211 |  |  | ondx = 2*SHADCACHE*(int)(2*SHADCACHE*srcp->obscache->p.d.e1 * | 
| 212 |  |  | (r->rorg[ax1] + t*srcp->sloc[ax1] - | 
| 213 |  |  | srcp->obscache->p.d.o[ax1])); | 
| 214 |  |  | ondx += (int)(2*SHADCACHE*srcp->obscache->p.d.e2 * | 
| 215 |  |  | (r->rorg[ax2] + t*srcp->sloc[ax2] - | 
| 216 |  |  | srcp->obscache->p.d.o[ax2])); | 
| 217 | schorsch | 2.4 | if ((ondx < 0) | (ondx >= 4*SHADCACHE*SHADCACHE)) | 
| 218 | greg | 2.1 | return(&noobs); /* could happen if ray is outside */ | 
| 219 |  |  | } else if (srcp->sflags & SFLAT) { | 
| 220 |  |  | FVECT   sd; | 
| 221 |  |  | RREAL   sd0m, sd1m; | 
| 222 |  |  | sd[0] = -DOT(r->rdir, srcp->obscache->p.f.u); | 
| 223 |  |  | sd[1] = -DOT(r->rdir, srcp->obscache->p.f.v); | 
| 224 |  |  | sd[2] = -DOT(r->rdir, srcp->snorm); | 
| 225 |  |  | if (sd[2] < 0) | 
| 226 |  |  | return(&noobs); /* shouldn't happen */ | 
| 227 |  |  | sd0m = ABS(sd[0]); | 
| 228 |  |  | sd1m = ABS(sd[1]); | 
| 229 |  |  | if (sd[2] >= sd0m && sd[2] >= sd1m) { | 
| 230 |  |  | ondx = SHADCACHE*(int)(SHADCACHE*(.5-FTINY) * | 
| 231 |  |  | (1. + sd[0]/sd[2])); | 
| 232 |  |  | ondx += (int)(SHADCACHE*(.5-FTINY) * | 
| 233 |  |  | (1. + sd[1]/sd[2])); | 
| 234 |  |  | } else if (sd0m >= sd1m) { | 
| 235 |  |  | ondx = SHADCACHE*SHADCACHE; | 
| 236 |  |  | if (sd[0] < 0) | 
| 237 |  |  | ondx += ((SHADCACHE+1)>>1)*SHADCACHE; | 
| 238 |  |  | ondx += SHADCACHE*(int)(SHADCACHE*(.5-FTINY) * | 
| 239 | greg | 2.3 | (1. - sd[2]/sd0m)); | 
| 240 | greg | 2.1 | ondx += (int)(SHADCACHE*(.5-FTINY) * | 
| 241 |  |  | (1. + sd[1]/sd0m)); | 
| 242 |  |  | } else /* sd1m > sd0m */ { | 
| 243 |  |  | ondx = SHADCACHE*SHADCACHE + | 
| 244 |  |  | ((SHADCACHE+1)>>1)*SHADCACHE*2; | 
| 245 |  |  | if (sd[1] < 0) | 
| 246 |  |  | ondx += ((SHADCACHE+1)>>1)*SHADCACHE; | 
| 247 |  |  | ondx += SHADCACHE*(int)(SHADCACHE*(.5-FTINY) * | 
| 248 | greg | 2.3 | (1. - sd[2]/sd1m)); | 
| 249 | greg | 2.1 | ondx += (int)(SHADCACHE*(.5-FTINY) * | 
| 250 |  |  | (1. + sd[0]/sd1m)); | 
| 251 |  |  | } | 
| 252 | greg | 2.6 | DCHECK((ondx < 0) | (ondx >= SHADCACHE*SHADCACHE*3 + | 
| 253 |  |  | (SHADCACHE&1)*SHADCACHE*4), CONSISTENCY, | 
| 254 | greg | 2.3 | "flat source cache index out of bounds"); | 
| 255 | greg | 2.1 | } else /* spherical distribution */ { | 
| 256 |  |  | int     ax, ax1, ax2; | 
| 257 |  |  | RREAL   amax = 0; | 
| 258 |  |  | for (ax1 = 3; ax1--; ) | 
| 259 |  |  | if (ABS(r->rdir[ax1]) > amax) { | 
| 260 |  |  | amax = ABS(r->rdir[ax1]); | 
| 261 |  |  | ax = ax1; | 
| 262 |  |  | } | 
| 263 |  |  | if ((ax1 = ax+1) >= 3) ax1 -= 3; | 
| 264 |  |  | if ((ax2 = ax+2) >= 3) ax2 -= 3; | 
| 265 |  |  | ondx = 2*SHADCACHE*SHADCACHE * ax; | 
| 266 |  |  | if (r->rdir[ax] < 0) | 
| 267 |  |  | ondx += SHADCACHE*SHADCACHE; | 
| 268 |  |  | ondx += SHADCACHE*(int)(SHADCACHE*(.5-FTINY) * | 
| 269 |  |  | (1. + r->rdir[ax1]/amax)); | 
| 270 |  |  | ondx += (int)(SHADCACHE*(.5-FTINY) * | 
| 271 |  |  | (1. + r->rdir[ax2]/amax)); | 
| 272 | greg | 2.6 | DCHECK((ondx < 0) | (ondx >= SHADCACHE*SHADCACHE*6), CONSISTENCY, | 
| 273 | greg | 2.3 | "radial source cache index out of bounds"); | 
| 274 | greg | 2.1 | } | 
| 275 |  |  | /* return cache pointer */ | 
| 276 | greg | 2.6 | return(lastobjp = &srcp->obscache->obs[ondx]); | 
| 277 | greg | 2.1 | } | 
| 278 |  |  |  | 
| 279 |  |  |  | 
| 280 |  |  | void                            /* free obstruction cache */ | 
| 281 |  |  | freeobscache(SRCREC *srcp) | 
| 282 |  |  | { | 
| 283 |  |  | if (srcp->obscache == NULL) | 
| 284 |  |  | return; | 
| 285 |  |  | free((void *)srcp->obscache); | 
| 286 |  |  | srcp->obscache = NULL; | 
| 287 |  |  | } | 
| 288 |  |  |  | 
| 289 |  |  |  | 
| 290 | greg | 2.7 | int                             /* record a source blocker */ | 
| 291 | greg | 2.1 | srcblocker(register RAY *r) | 
| 292 |  |  | { | 
| 293 |  |  | OBJREC  *m; | 
| 294 |  |  |  | 
| 295 |  |  | if (r->robj == OVOID || objptr(r->robj) != r->ro || | 
| 296 |  |  | isvolume(r->ro->otype)) | 
| 297 | greg | 2.7 | return(0);              /* don't record complex blockers */ | 
| 298 | greg | 2.11 | if (r->rsrc < 0 || source[r->rsrc].so == r->ro) | 
| 299 |  |  | return(0);              /* just a mistake, that's all */ | 
| 300 | greg | 2.13 | if (antimodlist != NULL && inset(antimodlist, r->ro->omod)) | 
| 301 |  |  | return(0);              /* could be clipped */ | 
| 302 | greg | 2.1 | m = findmaterial(r->ro); | 
| 303 |  |  | if (m == NULL) | 
| 304 | greg | 2.7 | return(0);              /* no material?! */ | 
| 305 | greg | 2.5 | if (!isopaque(m->otype)) | 
| 306 | greg | 2.7 | return(0);              /* material not a reliable blocker */ | 
| 307 | greg | 2.1 | *srcobstructp(r) = r->robj;     /* else record obstructor */ | 
| 308 | greg | 2.7 | return(1); | 
| 309 | greg | 2.1 | } | 
| 310 |  |  |  | 
| 311 |  |  |  | 
| 312 |  |  | int                             /* check ray against cached blocker */ | 
| 313 |  |  | srcblocked(RAY *r) | 
| 314 |  |  | { | 
| 315 |  |  | OBJECT  obs = *srcobstructp(r); | 
| 316 |  |  | OBJREC  *op; | 
| 317 |  |  |  | 
| 318 |  |  | if (obs == OVOID) | 
| 319 |  |  | return(0); | 
| 320 | greg | 2.10 | op = objptr(obs);               /* check blocker intersection */ | 
| 321 | greg | 2.9 | if (!(*ofun[op->otype].funp)(op, r)) | 
| 322 |  |  | return(0); | 
| 323 | greg | 2.10 | if (source[r->rsrc].sflags & SDISTANT) | 
| 324 |  |  | return(1); | 
| 325 |  |  | op = source[r->rsrc].so;        /* check source intersection */ | 
| 326 |  |  | if (!(*ofun[op->otype].funp)(op, r)) | 
| 327 |  |  | return(1); | 
| 328 |  |  | rayclear(r); | 
| 329 |  |  | return(0);                      /* source in front */ | 
| 330 | greg | 2.1 | } | 
| 331 |  |  |  | 
| 332 |  |  |  | 
| 333 | greg | 2.13 | void                            /* record potentially clipped materials */ | 
| 334 |  |  | markclip(OBJREC *m) | 
| 335 |  |  | { | 
| 336 |  |  | OBJECT  *set2add, *oldset; | 
| 337 |  |  |  | 
| 338 | greg | 2.16 | if (m == NULL) {                /* starting over */ | 
| 339 |  |  | if (antimodlist != NULL) | 
| 340 |  |  | free((void *)antimodlist); | 
| 341 |  |  | antimodlist = NULL; | 
| 342 |  |  | return; | 
| 343 |  |  | } | 
| 344 | greg | 2.13 | m_clip(m, NULL);                /* initialize modifier list */ | 
| 345 |  |  | if ((set2add = (OBJECT *)m->os) == NULL || !set2add[0]) | 
| 346 |  |  | return; | 
| 347 |  |  |  | 
| 348 |  |  | if (antimodlist == NULL) {      /* start of list */ | 
| 349 |  |  | antimodlist = setsave(set2add); | 
| 350 |  |  | return; | 
| 351 |  |  | } | 
| 352 |  |  | /* else add to previous list */ | 
| 353 |  |  | oldset = antimodlist; | 
| 354 |  |  | antimodlist = (OBJECT *)malloc((oldset[0]+set2add[0]+1)*sizeof(OBJECT)); | 
| 355 |  |  | if (antimodlist == NULL) | 
| 356 |  |  | error(SYSTEM, "out of memory in markclip"); | 
| 357 |  |  | setunion(antimodlist, oldset, set2add); | 
| 358 |  |  | free((void *)oldset); | 
| 359 |  |  | } | 
| 360 |  |  |  | 
| 361 |  |  |  | 
| 362 |  |  | #else   /* SHADCACHE */ | 
| 363 |  |  |  | 
| 364 |  |  |  | 
| 365 |  |  | void                            /* no-op also avoids linker warning */ | 
| 366 |  |  | markclip(OBJREC *m) | 
| 367 |  |  | { | 
| 368 |  |  | (void)m; | 
| 369 |  |  | } | 
| 370 |  |  |  | 
| 371 |  |  |  | 
| 372 | greg | 2.1 | #endif  /* SHADCACHE */ |