| 19 |
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#if SHADCACHE /* preemptive shadow checking */ |
| 20 |
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|
| 21 |
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|
| 22 |
< |
static void /* cast source ray to first blocker */ |
| 22 |
> |
static int /* cast source ray to first blocker */ |
| 23 |
|
castshadow(int sn, FVECT rorg, FVECT rdir) |
| 24 |
|
{ |
| 25 |
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RAY rt; |
| 28 |
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VCOPY(rt.rdir, rdir); |
| 29 |
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rt.rmax = 0; |
| 30 |
|
rayorigin(&rt, NULL, PRIMARY, 1.0); |
| 31 |
< |
if (!localhit(&rt, &thescene)) |
| 32 |
< |
return; |
| 33 |
< |
/* pretend we were aimed at source */ |
| 34 |
< |
rt.crtype |= rt.rtype = SHADOW; |
| 35 |
< |
rt.rdir[0] = -rt.rdir[0]; |
| 36 |
< |
rt.rdir[1] = -rt.rdir[1]; |
| 37 |
< |
rt.rdir[2] = -rt.rdir[2]; |
| 38 |
< |
rt.rod = -rt.rod; |
| 39 |
< |
VSUB(rt.rorg, rt.rop, rt.rdir); |
| 40 |
< |
rt.rot = 1.; |
| 41 |
< |
rt.rsrc = sn; |
| 31 |
> |
/* check for intersection */ |
| 32 |
> |
while (localhit(&rt, &thescene)) { |
| 33 |
> |
RAY rt1 = rt; /* pretend we were aimed at source */ |
| 34 |
> |
rt1.crtype |= rt1.rtype = SHADOW; |
| 35 |
> |
rt1.rdir[0] = -rt.rdir[0]; |
| 36 |
> |
rt1.rdir[1] = -rt.rdir[1]; |
| 37 |
> |
rt1.rdir[2] = -rt.rdir[2]; |
| 38 |
> |
rt1.rod = -rt.rod; |
| 39 |
> |
VSUB(rt1.rorg, rt.rop, rt.rdir); |
| 40 |
> |
rt1.rot = 1.; |
| 41 |
> |
rt1.rsrc = sn; |
| 42 |
|
/* record blocker */ |
| 43 |
< |
srcblocker(&rt); |
| 43 |
> |
if (srcblocker(&rt1)) |
| 44 |
> |
return(1); |
| 45 |
> |
/* move past failed blocker */ |
| 46 |
> |
VSUM(rt.rorg, rt.rop, rt.rdir, FTINY); |
| 47 |
> |
rayclear(&rt); /* & try again... */ |
| 48 |
> |
} |
| 49 |
> |
return(0); /* found no blockers */ |
| 50 |
|
} |
| 51 |
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|
| 52 |
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|
| 53 |
< |
static void /* initialize occlusion cache */ |
| 53 |
> |
void /* initialize occlusion cache */ |
| 54 |
|
initobscache(int sn) |
| 55 |
|
{ |
| 56 |
|
register SRCREC *srcp = &source[sn]; |
| 60 |
|
int i, j, k; |
| 61 |
|
int ax, ax1, ax2; |
| 62 |
|
|
| 63 |
+ |
if (srcp->sflags & (SSKIP|SPROX|SSPOT|SVIRTUAL)) |
| 64 |
+ |
return; /* don't cache these */ |
| 65 |
|
if (srcp->sflags & SDISTANT) |
| 66 |
|
cachelen = 4*SHADCACHE*SHADCACHE; |
| 67 |
|
else if (srcp->sflags & SFLAT) |
| 69 |
|
else /* spherical distribution */ |
| 70 |
|
cachelen = SHADCACHE*SHADCACHE*6; |
| 71 |
|
/* allocate cache */ |
| 64 |
– |
DCHECK(srcp->obscache != NULL, |
| 65 |
– |
CONSISTENCY, "initobscache() called twice"); |
| 72 |
|
srcp->obscache = (OBSCACHE *)malloc(sizeof(OBSCACHE) + |
| 73 |
|
sizeof(OBJECT)*(cachelen-1)); |
| 74 |
|
if (srcp->obscache == NULL) |
| 175 |
|
static OBJECT * /* return occluder cache entry */ |
| 176 |
|
srcobstructp(register RAY *r) |
| 177 |
|
{ |
| 178 |
+ |
static unsigned long lastrno = ~0; |
| 179 |
|
static OBJECT noobs; |
| 180 |
+ |
static OBJECT *lastobjp; |
| 181 |
|
SRCREC *srcp; |
| 182 |
|
int ondx; |
| 183 |
|
|
| 184 |
+ |
noobs = OVOID; |
| 185 |
+ |
if (r->rno == lastrno) |
| 186 |
+ |
return lastobjp; /* just recall last pointer */ |
| 187 |
|
DCHECK(r->rsrc < 0, CONSISTENCY, |
| 188 |
|
"srcobstructp() called with unaimed ray"); |
| 189 |
< |
noobs = OVOID; |
| 189 |
> |
lastrno = r->rno; |
| 190 |
> |
lastobjp = &noobs; |
| 191 |
|
srcp = &source[r->rsrc]; |
| 192 |
|
if (srcp->sflags & (SSKIP|SPROX|SSPOT|SVIRTUAL)) |
| 193 |
|
return(&noobs); /* don't cache these */ |
| 244 |
|
ondx += (int)(SHADCACHE*(.5-FTINY) * |
| 245 |
|
(1. + sd[0]/sd1m)); |
| 246 |
|
} |
| 247 |
< |
DCHECK(ondx < 0 | ondx >= SHADCACHE*SHADCACHE*3 + |
| 248 |
< |
(SHADCACHE&1)*SHADCACHE*4, CONSISTENCY, |
| 247 |
> |
DCHECK((ondx < 0) | (ondx >= SHADCACHE*SHADCACHE*3 + |
| 248 |
> |
(SHADCACHE&1)*SHADCACHE*4), CONSISTENCY, |
| 249 |
|
"flat source cache index out of bounds"); |
| 250 |
|
} else /* spherical distribution */ { |
| 251 |
|
int ax, ax1, ax2; |
| 264 |
|
(1. + r->rdir[ax1]/amax)); |
| 265 |
|
ondx += (int)(SHADCACHE*(.5-FTINY) * |
| 266 |
|
(1. + r->rdir[ax2]/amax)); |
| 267 |
< |
DCHECK(ondx < 0 | ondx >= SHADCACHE*SHADCACHE*6, CONSISTENCY, |
| 267 |
> |
DCHECK((ondx < 0) | (ondx >= SHADCACHE*SHADCACHE*6), CONSISTENCY, |
| 268 |
|
"radial source cache index out of bounds"); |
| 269 |
|
} |
| 270 |
|
/* return cache pointer */ |
| 271 |
< |
return(&srcp->obscache->obs[ondx]); |
| 271 |
> |
return(lastobjp = &srcp->obscache->obs[ondx]); |
| 272 |
|
} |
| 273 |
|
|
| 274 |
|
|
| 282 |
|
} |
| 283 |
|
|
| 284 |
|
|
| 285 |
< |
void /* record a source blocker */ |
| 285 |
> |
int /* record a source blocker */ |
| 286 |
|
srcblocker(register RAY *r) |
| 287 |
|
{ |
| 288 |
|
OBJREC *m; |
| 289 |
|
|
| 290 |
|
if (r->robj == OVOID || objptr(r->robj) != r->ro || |
| 291 |
|
isvolume(r->ro->otype)) |
| 292 |
< |
return; /* don't record complex blockers */ |
| 292 |
> |
return(0); /* don't record complex blockers */ |
| 293 |
|
m = findmaterial(r->ro); |
| 294 |
|
if (m == NULL) |
| 295 |
< |
return; /* no material?! */ |
| 295 |
> |
return(0); /* no material?! */ |
| 296 |
|
if (!isopaque(m->otype)) |
| 297 |
< |
return; /* material not a reliable blocker */ |
| 297 |
> |
return(0); /* material not a reliable blocker */ |
| 298 |
|
*srcobstructp(r) = r->robj; /* else record obstructor */ |
| 299 |
+ |
return(1); |
| 300 |
|
} |
| 301 |
|
|
| 302 |
|
|
| 309 |
|
if (obs == OVOID) |
| 310 |
|
return(0); |
| 311 |
|
op = objptr(obs); /* check for intersection */ |
| 312 |
< |
return((*ofun[op->otype].funp)(op, r)); |
| 312 |
> |
if (!(*ofun[op->otype].funp)(op, r)) |
| 313 |
> |
return(0); |
| 314 |
> |
op = source[r->rsrc].so; /* check source really obstructed */ |
| 315 |
> |
if ((*ofun[op->otype].funp)(op, r)) { |
| 316 |
> |
rayclear(r); /* actually, source in front! */ |
| 317 |
> |
return(0); |
| 318 |
> |
} |
| 319 |
> |
return(1); /* source truly blocked */ |
| 320 |
|
} |
| 321 |
|
|
| 322 |
|
|
