| 1 |
#ifndef lint |
| 2 |
static const char RCSid[] = "$Id: srcobstr.c,v 2.19 2017/02/22 03:16:20 greg Exp $"; |
| 3 |
#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 |
#include "rtotypes.h" |
| 15 |
|
| 16 |
#include "source.h" |
| 17 |
|
| 18 |
#if SHADCACHE /* preemptive shadow checking */ |
| 19 |
|
| 20 |
#ifndef MAX2SHADE |
| 21 |
#define MAX2SHADE 200 /* limit # of sources to precheck */ |
| 22 |
#endif |
| 23 |
|
| 24 |
#define ABS(x) ((x)>0 ? (x) : -(x)) |
| 25 |
|
| 26 |
|
| 27 |
OBJECT * antimodlist = NULL; /* set of clipped materials */ |
| 28 |
|
| 29 |
|
| 30 |
static int /* cast source ray to first blocker */ |
| 31 |
castshadow(int sn, FVECT rorg, FVECT rdir) |
| 32 |
{ |
| 33 |
RAY rt; |
| 34 |
|
| 35 |
VCOPY(rt.rorg, rorg); |
| 36 |
VCOPY(rt.rdir, rdir); |
| 37 |
rt.rmax = 0; |
| 38 |
rayorigin(&rt, PRIMARY, NULL, NULL); |
| 39 |
/* check for intersection */ |
| 40 |
while (localhit(&rt, &thescene)) { |
| 41 |
RAY rt1 = rt; /* pretend we were aimed at source */ |
| 42 |
rt1.crtype |= rt1.rtype = RSHADOW; |
| 43 |
rt1.rdir[0] = -rt.rdir[0]; |
| 44 |
rt1.rdir[1] = -rt.rdir[1]; |
| 45 |
rt1.rdir[2] = -rt.rdir[2]; |
| 46 |
rt1.rod = -rt.rod; |
| 47 |
VSUB(rt1.rorg, rt.rop, rt.rdir); |
| 48 |
rt1.rot = 1.; |
| 49 |
rt1.rsrc = sn; |
| 50 |
/* record blocker */ |
| 51 |
if (srcblocker(&rt1)) |
| 52 |
return(1); |
| 53 |
/* move past failed blocker */ |
| 54 |
VSUM(rt.rorg, rt.rop, rt.rdir, FTINY); |
| 55 |
rayclear(&rt); /* & try again... */ |
| 56 |
} |
| 57 |
return(0); /* found no blockers */ |
| 58 |
} |
| 59 |
|
| 60 |
|
| 61 |
void /* initialize occlusion cache */ |
| 62 |
initobscache(int sn) |
| 63 |
{ |
| 64 |
SRCREC *srcp = &source[sn]; |
| 65 |
int cachelen; |
| 66 |
FVECT rorg, rdir; |
| 67 |
RREAL d; |
| 68 |
int i, j, k; |
| 69 |
int ax=0, ax1=1, ax2=2; |
| 70 |
|
| 71 |
if (srcp->sflags & (SSKIP|SPROX|SSPOT|SVIRTUAL)) |
| 72 |
return; /* don't cache these */ |
| 73 |
if (srcp->sflags & SDISTANT) |
| 74 |
cachelen = 4*SHADCACHE*SHADCACHE; |
| 75 |
else if (srcp->sflags & SFLAT) |
| 76 |
cachelen = SHADCACHE*SHADCACHE*3 + (SHADCACHE&1)*SHADCACHE*4; |
| 77 |
else /* spherical distribution */ |
| 78 |
cachelen = SHADCACHE*SHADCACHE*6; |
| 79 |
/* allocate cache */ |
| 80 |
srcp->obscache = (OBSCACHE *)malloc(sizeof(OBSCACHE) + |
| 81 |
sizeof(OBJECT)*(cachelen-1)); |
| 82 |
if (srcp->obscache == NULL) |
| 83 |
error(SYSTEM, "out of memory in initobscache()"); |
| 84 |
/* set parameters */ |
| 85 |
if (srcp->sflags & SDISTANT) { |
| 86 |
RREAL amax = 0; |
| 87 |
for (ax1 = 3; ax1--; ) |
| 88 |
if (ABS(srcp->sloc[ax1]) > amax) { |
| 89 |
amax = ABS(srcp->sloc[ax1]); |
| 90 |
ax = ax1; |
| 91 |
} |
| 92 |
srcp->obscache->p.d.ax = ax; |
| 93 |
ax1 = (ax+1)%3; |
| 94 |
ax2 = (ax+2)%3; |
| 95 |
VCOPY(srcp->obscache->p.d.o, thescene.cuorg); |
| 96 |
if (srcp->sloc[ax] > 0) |
| 97 |
srcp->obscache->p.d.o[ax] += thescene.cusize; |
| 98 |
if (srcp->sloc[ax1] < 0) |
| 99 |
srcp->obscache->p.d.o[ax1] += thescene.cusize * |
| 100 |
srcp->sloc[ax1] / amax; |
| 101 |
if (srcp->sloc[ax2] < 0) |
| 102 |
srcp->obscache->p.d.o[ax2] += thescene.cusize * |
| 103 |
srcp->sloc[ax2] / amax; |
| 104 |
srcp->obscache->p.d.e1 = 1. / (thescene.cusize*(1. + |
| 105 |
fabs(srcp->sloc[ax1])/amax)); |
| 106 |
srcp->obscache->p.d.e2 = 1. / (thescene.cusize*(1. + |
| 107 |
fabs(srcp->sloc[ax2])/amax)); |
| 108 |
} else if (srcp->sflags & SFLAT) { |
| 109 |
VCOPY(srcp->obscache->p.f.u, srcp->ss[SU]); |
| 110 |
normalize(srcp->obscache->p.f.u); |
| 111 |
fcross(srcp->obscache->p.f.v, |
| 112 |
srcp->snorm, srcp->obscache->p.f.u); |
| 113 |
} |
| 114 |
/* clear cache */ |
| 115 |
for (i = cachelen; i--; ) |
| 116 |
srcp->obscache->obs[i] = OVOID; |
| 117 |
#if (MAX2SHADE >= 0) |
| 118 |
if (sn >= MAX2SHADE) /* limit on prechecking */ |
| 119 |
return; |
| 120 |
#endif |
| 121 |
/* cast shadow rays */ |
| 122 |
if (srcp->sflags & SDISTANT) { |
| 123 |
for (k = 3; k--; ) |
| 124 |
rdir[k] = -srcp->sloc[k]; |
| 125 |
for (i = 2*SHADCACHE; i--; ) |
| 126 |
for (j = 2*SHADCACHE; j--; ) { |
| 127 |
VCOPY(rorg, srcp->obscache->p.d.o); |
| 128 |
rorg[ax1] += (i+.5) / |
| 129 |
(2*SHADCACHE*srcp->obscache->p.d.e1); |
| 130 |
rorg[ax2] += (j+.5) / |
| 131 |
(2*SHADCACHE*srcp->obscache->p.d.e2); |
| 132 |
castshadow(sn, rorg, rdir); |
| 133 |
} |
| 134 |
} else if (srcp->sflags & SFLAT) { |
| 135 |
d = 0.01*srcp->srad; |
| 136 |
VSUM(rorg, srcp->sloc, srcp->snorm, d); |
| 137 |
for (i = SHADCACHE; i--; ) |
| 138 |
for (j = SHADCACHE; j--; ) { |
| 139 |
d = 2./SHADCACHE*(i+.5) - 1.; |
| 140 |
VSUM(rdir, srcp->snorm, |
| 141 |
srcp->obscache->p.f.u, d); |
| 142 |
d = 2./SHADCACHE*(j+.5) - 1.; |
| 143 |
VSUM(rdir, rdir, srcp->obscache->p.f.v, d); |
| 144 |
normalize(rdir); |
| 145 |
castshadow(sn, rorg, rdir); |
| 146 |
} |
| 147 |
for (k = 2; k--; ) |
| 148 |
for (i = SHADCACHE; i--; ) |
| 149 |
for (j = SHADCACHE>>1; j--; ) { |
| 150 |
d = 2./SHADCACHE*(i+.5) - 1.; |
| 151 |
if (k) |
| 152 |
VSUM(rdir, srcp->obscache->p.f.u, |
| 153 |
srcp->obscache->p.f.v, d); |
| 154 |
else |
| 155 |
VSUM(rdir, srcp->obscache->p.f.v, |
| 156 |
srcp->obscache->p.f.u, d); |
| 157 |
d = 1. - 2./SHADCACHE*(j+.5); |
| 158 |
VSUM(rdir, rdir, srcp->snorm, d); |
| 159 |
normalize(rdir); |
| 160 |
castshadow(sn, rorg, rdir); |
| 161 |
d = 2.*DOT(rdir, srcp->snorm); |
| 162 |
rdir[0] = d*srcp->snorm[0] - rdir[0]; |
| 163 |
rdir[1] = d*srcp->snorm[1] - rdir[1]; |
| 164 |
rdir[2] = d*srcp->snorm[2] - rdir[2]; |
| 165 |
castshadow(sn, rorg, rdir); |
| 166 |
} |
| 167 |
} else /* spherical distribution */ |
| 168 |
for (k = 6; k--; ) { |
| 169 |
ax = k%3; |
| 170 |
ax1 = (k+1)%3; |
| 171 |
ax2 = (k+2)%3; |
| 172 |
for (i = SHADCACHE; i--; ) |
| 173 |
for (j = SHADCACHE; j--; ) { |
| 174 |
rdir[0]=rdir[1]=rdir[2] = 0.; |
| 175 |
rdir[ax] = k<3 ? 1. : -1.; |
| 176 |
rdir[ax1] = 2./SHADCACHE*(i+.5) - 1.; |
| 177 |
rdir[ax2] = 2./SHADCACHE*(j+.5) - 1.; |
| 178 |
normalize(rdir); |
| 179 |
d = 1.05*srcp->srad; |
| 180 |
VSUM(rorg, srcp->sloc, rdir, d); |
| 181 |
castshadow(sn, rorg, rdir); |
| 182 |
} |
| 183 |
} |
| 184 |
} |
| 185 |
|
| 186 |
|
| 187 |
static OBJECT * /* return occluder cache entry */ |
| 188 |
srcobstructp(RAY *r) |
| 189 |
{ |
| 190 |
static RNUMBER lastrno = ~0; |
| 191 |
static OBJECT noobs; |
| 192 |
static OBJECT *lastobjp; |
| 193 |
SRCREC *srcp; |
| 194 |
int ondx; |
| 195 |
|
| 196 |
noobs = OVOID; |
| 197 |
if (r->rno == lastrno) |
| 198 |
return lastobjp; /* just recall last pointer */ |
| 199 |
DCHECK(r->rsrc < 0, CONSISTENCY, |
| 200 |
"srcobstructp() called with unaimed ray"); |
| 201 |
lastrno = r->rno; |
| 202 |
lastobjp = &noobs; |
| 203 |
srcp = &source[r->rsrc]; |
| 204 |
if (srcp->sflags & (SSKIP|SPROX|SSPOT|SVIRTUAL)) |
| 205 |
return(&noobs); /* don't cache these */ |
| 206 |
if (srcp->obscache == NULL) /* initialize cache */ |
| 207 |
initobscache(r->rsrc); |
| 208 |
/* compute cache index */ |
| 209 |
if (srcp->sflags & SDISTANT) { |
| 210 |
int ax=0, ax1=1, ax2=2; |
| 211 |
double t; |
| 212 |
ax = srcp->obscache->p.d.ax; |
| 213 |
if ((ax1 = ax+1) >= 3) ax1 -= 3; |
| 214 |
if ((ax2 = ax+2) >= 3) ax2 -= 3; |
| 215 |
t = (srcp->obscache->p.d.o[ax] - r->rorg[ax]) / srcp->sloc[ax]; |
| 216 |
if (t <= FTINY) |
| 217 |
return(&noobs); /* could happen if ray is outside */ |
| 218 |
ondx = 2*SHADCACHE*(int)(2*SHADCACHE*srcp->obscache->p.d.e1 * |
| 219 |
(r->rorg[ax1] + t*srcp->sloc[ax1] - |
| 220 |
srcp->obscache->p.d.o[ax1])); |
| 221 |
ondx += (int)(2*SHADCACHE*srcp->obscache->p.d.e2 * |
| 222 |
(r->rorg[ax2] + t*srcp->sloc[ax2] - |
| 223 |
srcp->obscache->p.d.o[ax2])); |
| 224 |
if ((ondx < 0) | (ondx >= 4*SHADCACHE*SHADCACHE)) |
| 225 |
return(&noobs); /* could happen if ray is outside */ |
| 226 |
} else if (srcp->sflags & SFLAT) { |
| 227 |
FVECT sd; |
| 228 |
RREAL sd0m, sd1m; |
| 229 |
sd[0] = -DOT(r->rdir, srcp->obscache->p.f.u); |
| 230 |
sd[1] = -DOT(r->rdir, srcp->obscache->p.f.v); |
| 231 |
sd[2] = -DOT(r->rdir, srcp->snorm); |
| 232 |
if (sd[2] < 0) |
| 233 |
return(&noobs); /* shouldn't happen */ |
| 234 |
sd0m = ABS(sd[0]); |
| 235 |
sd1m = ABS(sd[1]); |
| 236 |
if (sd[2] >= sd0m && sd[2] >= sd1m) { |
| 237 |
ondx = SHADCACHE*(int)(SHADCACHE*(.5-FTINY) * |
| 238 |
(1. + sd[0]/sd[2])); |
| 239 |
ondx += (int)(SHADCACHE*(.5-FTINY) * |
| 240 |
(1. + sd[1]/sd[2])); |
| 241 |
} else if (sd0m >= sd1m) { |
| 242 |
ondx = SHADCACHE*SHADCACHE; |
| 243 |
if (sd[0] < 0) |
| 244 |
ondx += ((SHADCACHE+1)>>1)*SHADCACHE; |
| 245 |
ondx += SHADCACHE*(int)(SHADCACHE*(.5-FTINY) * |
| 246 |
(1. - sd[2]/sd0m)); |
| 247 |
ondx += (int)(SHADCACHE*(.5-FTINY) * |
| 248 |
(1. + sd[1]/sd0m)); |
| 249 |
} else /* sd1m > sd0m */ { |
| 250 |
ondx = SHADCACHE*SHADCACHE + |
| 251 |
((SHADCACHE+1)>>1)*SHADCACHE*2; |
| 252 |
if (sd[1] < 0) |
| 253 |
ondx += ((SHADCACHE+1)>>1)*SHADCACHE; |
| 254 |
ondx += SHADCACHE*(int)(SHADCACHE*(.5-FTINY) * |
| 255 |
(1. - sd[2]/sd1m)); |
| 256 |
ondx += (int)(SHADCACHE*(.5-FTINY) * |
| 257 |
(1. + sd[0]/sd1m)); |
| 258 |
} |
| 259 |
DCHECK((ondx < 0) | (ondx >= SHADCACHE*SHADCACHE*3 + |
| 260 |
(SHADCACHE&1)*SHADCACHE*4), CONSISTENCY, |
| 261 |
"flat source cache index out of bounds"); |
| 262 |
} else /* spherical distribution */ { |
| 263 |
int ax, ax1, ax2; |
| 264 |
RREAL amax = 0; |
| 265 |
for (ax1 = 3; ax1--; ) |
| 266 |
if (ABS(r->rdir[ax1]) > amax) { |
| 267 |
amax = ABS(r->rdir[ax1]); |
| 268 |
ax = ax1; |
| 269 |
} |
| 270 |
if ((ax1 = ax+1) >= 3) ax1 -= 3; |
| 271 |
if ((ax2 = ax+2) >= 3) ax2 -= 3; |
| 272 |
ondx = 2*SHADCACHE*SHADCACHE * ax; |
| 273 |
if (r->rdir[ax] < 0) |
| 274 |
ondx += SHADCACHE*SHADCACHE; |
| 275 |
ondx += SHADCACHE*(int)(SHADCACHE*(.5-FTINY) * |
| 276 |
(1. + r->rdir[ax1]/amax)); |
| 277 |
ondx += (int)(SHADCACHE*(.5-FTINY) * |
| 278 |
(1. + r->rdir[ax2]/amax)); |
| 279 |
DCHECK((ondx < 0) | (ondx >= SHADCACHE*SHADCACHE*6), CONSISTENCY, |
| 280 |
"radial source cache index out of bounds"); |
| 281 |
} |
| 282 |
/* return cache pointer */ |
| 283 |
return(lastobjp = &srcp->obscache->obs[ondx]); |
| 284 |
} |
| 285 |
|
| 286 |
|
| 287 |
void /* free obstruction cache */ |
| 288 |
freeobscache(SRCREC *srcp) |
| 289 |
{ |
| 290 |
if (srcp->obscache == NULL) |
| 291 |
return; |
| 292 |
free((void *)srcp->obscache); |
| 293 |
srcp->obscache = NULL; |
| 294 |
} |
| 295 |
|
| 296 |
|
| 297 |
int /* record a source blocker */ |
| 298 |
srcblocker(RAY *r) |
| 299 |
{ |
| 300 |
OBJREC *m; |
| 301 |
|
| 302 |
if (r->robj == OVOID || objptr(r->robj) != r->ro || |
| 303 |
isvolume(r->ro->otype)) |
| 304 |
return(0); /* don't record complex blockers */ |
| 305 |
if (r->rsrc < 0 || source[r->rsrc].so == r->ro) |
| 306 |
return(0); /* just a mistake, that's all */ |
| 307 |
if (antimodlist != NULL && inset(antimodlist, r->ro->omod)) |
| 308 |
return(0); /* could be clipped */ |
| 309 |
m = findmaterial(r->ro); |
| 310 |
if (m == NULL) |
| 311 |
return(0); /* no material?! */ |
| 312 |
if (!isopaque(m->otype)) |
| 313 |
return(0); /* material not a reliable blocker */ |
| 314 |
*srcobstructp(r) = r->robj; /* else record obstructor */ |
| 315 |
return(1); |
| 316 |
} |
| 317 |
|
| 318 |
|
| 319 |
int /* check ray against cached blocker */ |
| 320 |
srcblocked(RAY *r) |
| 321 |
{ |
| 322 |
OBJECT obs = *srcobstructp(r); |
| 323 |
OBJREC *op; |
| 324 |
|
| 325 |
if (obs == OVOID) |
| 326 |
return(0); |
| 327 |
op = objptr(obs); /* check blocker intersection */ |
| 328 |
if (!(*ofun[op->otype].funp)(op, r)) |
| 329 |
return(0); |
| 330 |
if (source[r->rsrc].sflags & SDISTANT) |
| 331 |
return(1); |
| 332 |
op = source[r->rsrc].so; /* check source intersection */ |
| 333 |
if (!(*ofun[op->otype].funp)(op, r)) |
| 334 |
return(1); |
| 335 |
rayclear(r); |
| 336 |
return(0); /* source in front */ |
| 337 |
} |
| 338 |
|
| 339 |
|
| 340 |
void /* record potentially clipped materials */ |
| 341 |
markclip(OBJREC *m) |
| 342 |
{ |
| 343 |
OBJECT *set2add, *oldset; |
| 344 |
|
| 345 |
if (m == NULL) { /* starting over */ |
| 346 |
if (antimodlist != NULL) |
| 347 |
free((void *)antimodlist); |
| 348 |
antimodlist = NULL; |
| 349 |
return; |
| 350 |
} |
| 351 |
m_clip(m, NULL); /* initialize modifier list */ |
| 352 |
if ((set2add = (OBJECT *)m->os) == NULL || !set2add[0]) |
| 353 |
return; |
| 354 |
|
| 355 |
if (antimodlist == NULL) { /* start of list */ |
| 356 |
antimodlist = setsave(set2add); |
| 357 |
return; |
| 358 |
} |
| 359 |
/* else add to previous list */ |
| 360 |
oldset = antimodlist; |
| 361 |
antimodlist = (OBJECT *)malloc((oldset[0]+set2add[0]+1)*sizeof(OBJECT)); |
| 362 |
if (antimodlist == NULL) |
| 363 |
error(SYSTEM, "out of memory in markclip"); |
| 364 |
setunion(antimodlist, oldset, set2add); |
| 365 |
free((void *)oldset); |
| 366 |
} |
| 367 |
|
| 368 |
|
| 369 |
#else /* SHADCACHE */ |
| 370 |
|
| 371 |
|
| 372 |
void /* no-op also avoids linker warning */ |
| 373 |
markclip(OBJREC *m) |
| 374 |
{ |
| 375 |
(void)m; |
| 376 |
} |
| 377 |
|
| 378 |
|
| 379 |
#endif /* SHADCACHE */ |
