1 |
static const char RCSid[] = "$Id: ambient.c,v 2.101 2016/03/06 01:13:17 schorsch Exp $"; |
2 |
/* |
3 |
* ambient.c - routines dealing with ambient (inter-reflected) component. |
4 |
* |
5 |
* Declarations of external symbols in ambient.h |
6 |
*/ |
7 |
|
8 |
#include "copyright.h" |
9 |
|
10 |
#include <string.h> |
11 |
|
12 |
#include "platform.h" |
13 |
#include "ray.h" |
14 |
#include "otypes.h" |
15 |
#include "resolu.h" |
16 |
#include "ambient.h" |
17 |
#include "random.h" |
18 |
#include "pmapamb.h" |
19 |
|
20 |
#ifndef OCTSCALE |
21 |
#define OCTSCALE 1.0 /* ceil((valid rad.)/(cube size)) */ |
22 |
#endif |
23 |
|
24 |
extern char *shm_boundary; /* memory sharing boundary */ |
25 |
|
26 |
#ifndef MAXASET |
27 |
#define MAXASET 4095 /* maximum number of elements in ambient set */ |
28 |
#endif |
29 |
OBJECT ambset[MAXASET+1]={0}; /* ambient include/exclude set */ |
30 |
|
31 |
double maxarad; /* maximum ambient radius */ |
32 |
double minarad; /* minimum ambient radius */ |
33 |
|
34 |
static AMBTREE atrunk; /* our ambient trunk node */ |
35 |
|
36 |
static FILE *ambfp = NULL; /* ambient file pointer */ |
37 |
static int nunflshed = 0; /* number of unflushed ambient values */ |
38 |
|
39 |
#ifndef SORT_THRESH |
40 |
#ifdef SMLMEM |
41 |
#define SORT_THRESH ((16L<<20)/sizeof(AMBVAL)) |
42 |
#else |
43 |
#define SORT_THRESH ((64L<<20)/sizeof(AMBVAL)) |
44 |
#endif |
45 |
#endif |
46 |
#ifndef SORT_INTVL |
47 |
#define SORT_INTVL (SORT_THRESH<<1) |
48 |
#endif |
49 |
#ifndef MAX_SORT_INTVL |
50 |
#define MAX_SORT_INTVL (SORT_INTVL<<6) |
51 |
#endif |
52 |
|
53 |
|
54 |
static double avsum = 0.; /* computed ambient value sum (log) */ |
55 |
static unsigned int navsum = 0; /* number of values in avsum */ |
56 |
static unsigned int nambvals = 0; /* total number of indirect values */ |
57 |
static unsigned int nambshare = 0; /* number of values from file */ |
58 |
static unsigned long ambclock = 0; /* ambient access clock */ |
59 |
static unsigned long lastsort = 0; /* time of last value sort */ |
60 |
static long sortintvl = SORT_INTVL; /* time until next sort */ |
61 |
static FILE *ambinp = NULL; /* auxiliary file for input */ |
62 |
static long lastpos = -1; /* last flush position */ |
63 |
|
64 |
#define MAXACLOCK (1L<<30) /* clock turnover value */ |
65 |
/* |
66 |
* Track access times unless we are sharing ambient values |
67 |
* through memory on a multiprocessor, when we want to avoid |
68 |
* claiming our own memory (copy on write). Go ahead anyway |
69 |
* if more than two thirds of our values are unshared. |
70 |
* Compile with -Dtracktime=0 to turn this code off. |
71 |
*/ |
72 |
#ifndef tracktime |
73 |
#define tracktime (shm_boundary == NULL || nambvals > 3*nambshare) |
74 |
#endif |
75 |
|
76 |
#define AMBFLUSH (BUFSIZ/AMBVALSIZ) |
77 |
|
78 |
#define newambval() (AMBVAL *)malloc(sizeof(AMBVAL)) |
79 |
|
80 |
static void initambfile(int creat); |
81 |
static void avsave(AMBVAL *av); |
82 |
static AMBVAL *avstore(AMBVAL *aval); |
83 |
static AMBTREE *newambtree(void); |
84 |
static void freeambtree(AMBTREE *atp); |
85 |
|
86 |
typedef void unloadtf_t(AMBVAL *); |
87 |
static unloadtf_t avinsert; |
88 |
static unloadtf_t av2list; |
89 |
static unloadtf_t avfree; |
90 |
static void unloadatree(AMBTREE *at, unloadtf_t *f); |
91 |
|
92 |
static int aposcmp(const void *avp1, const void *avp2); |
93 |
static int avlmemi(AMBVAL *avaddr); |
94 |
static void sortambvals(int always); |
95 |
|
96 |
#ifdef F_SETLKW |
97 |
static void aflock(int typ); |
98 |
#endif |
99 |
|
100 |
|
101 |
void |
102 |
setambres( /* set ambient resolution */ |
103 |
int ar |
104 |
) |
105 |
{ |
106 |
ambres = ar < 0 ? 0 : ar; /* may be done already */ |
107 |
/* set min & max radii */ |
108 |
if (ar <= 0) { |
109 |
minarad = 0; |
110 |
maxarad = thescene.cusize*0.2; |
111 |
} else { |
112 |
minarad = thescene.cusize / ar; |
113 |
maxarad = 64.0 * minarad; /* heuristic */ |
114 |
if (maxarad > thescene.cusize*0.2) |
115 |
maxarad = thescene.cusize*0.2; |
116 |
} |
117 |
if (minarad <= FTINY) |
118 |
minarad = 10.0*FTINY; |
119 |
if (maxarad <= minarad) |
120 |
maxarad = 64.0 * minarad; |
121 |
} |
122 |
|
123 |
|
124 |
void |
125 |
setambacc( /* set ambient accuracy */ |
126 |
double newa |
127 |
) |
128 |
{ |
129 |
static double olda; /* remember previous setting here */ |
130 |
|
131 |
newa *= (newa > 0); |
132 |
if (fabs(newa - olda) >= .05*(newa + olda)) { |
133 |
ambacc = newa; |
134 |
if (nambvals > 0) |
135 |
sortambvals(1); /* rebuild tree */ |
136 |
} |
137 |
} |
138 |
|
139 |
|
140 |
void |
141 |
setambient(void) /* initialize calculation */ |
142 |
{ |
143 |
int readonly = 0; |
144 |
long flen; |
145 |
AMBVAL amb; |
146 |
/* make sure we're fresh */ |
147 |
ambdone(); |
148 |
/* init ambient limits */ |
149 |
setambres(ambres); |
150 |
setambacc(ambacc); |
151 |
if (ambfile == NULL || !ambfile[0]) |
152 |
return; |
153 |
if (ambacc <= FTINY) { |
154 |
sprintf(errmsg, "zero ambient accuracy so \"%s\" not opened", |
155 |
ambfile); |
156 |
error(WARNING, errmsg); |
157 |
return; |
158 |
} |
159 |
/* open ambient file */ |
160 |
if ((ambfp = fopen(ambfile, "r+")) == NULL) |
161 |
readonly = (ambfp = fopen(ambfile, "r")) != NULL; |
162 |
if (ambfp != NULL) { |
163 |
initambfile(0); /* file exists */ |
164 |
lastpos = ftell(ambfp); |
165 |
while (readambval(&amb, ambfp)) |
166 |
avstore(&amb); |
167 |
nambshare = nambvals; /* share loaded values */ |
168 |
if (readonly) { |
169 |
sprintf(errmsg, |
170 |
"loaded %u values from read-only ambient file", |
171 |
nambvals); |
172 |
error(WARNING, errmsg); |
173 |
fclose(ambfp); /* close file so no writes */ |
174 |
ambfp = NULL; |
175 |
return; /* avoid ambsync() */ |
176 |
} |
177 |
/* align file pointer */ |
178 |
lastpos += (long)nambvals*AMBVALSIZ; |
179 |
flen = lseek(fileno(ambfp), (off_t)0, SEEK_END); |
180 |
if (flen != lastpos) { |
181 |
sprintf(errmsg, |
182 |
"ignoring last %ld values in ambient file (corrupted)", |
183 |
(flen - lastpos)/AMBVALSIZ); |
184 |
error(WARNING, errmsg); |
185 |
fseek(ambfp, lastpos, SEEK_SET); |
186 |
ftruncate(fileno(ambfp), (off_t)lastpos); |
187 |
} |
188 |
} else if ((ambfp = fopen(ambfile, "w+")) != NULL) { |
189 |
initambfile(1); /* else create new file */ |
190 |
fflush(ambfp); |
191 |
lastpos = ftell(ambfp); |
192 |
} else { |
193 |
sprintf(errmsg, "cannot open ambient file \"%s\"", ambfile); |
194 |
error(SYSTEM, errmsg); |
195 |
} |
196 |
#ifdef F_SETLKW |
197 |
aflock(F_UNLCK); /* release file */ |
198 |
#endif |
199 |
} |
200 |
|
201 |
|
202 |
void |
203 |
ambdone(void) /* close ambient file and free memory */ |
204 |
{ |
205 |
if (ambfp != NULL) { /* close ambient file */ |
206 |
ambsync(); |
207 |
fclose(ambfp); |
208 |
ambfp = NULL; |
209 |
if (ambinp != NULL) { |
210 |
fclose(ambinp); |
211 |
ambinp = NULL; |
212 |
} |
213 |
lastpos = -1; |
214 |
} |
215 |
/* free ambient tree */ |
216 |
unloadatree(&atrunk, avfree); |
217 |
/* reset state variables */ |
218 |
avsum = 0.; |
219 |
navsum = 0; |
220 |
nambvals = 0; |
221 |
nambshare = 0; |
222 |
ambclock = 0; |
223 |
lastsort = 0; |
224 |
sortintvl = SORT_INTVL; |
225 |
} |
226 |
|
227 |
|
228 |
void |
229 |
ambnotify( /* record new modifier */ |
230 |
OBJECT obj |
231 |
) |
232 |
{ |
233 |
static int hitlimit = 0; |
234 |
OBJREC *o; |
235 |
char **amblp; |
236 |
|
237 |
if (obj == OVOID) { /* starting over */ |
238 |
ambset[0] = 0; |
239 |
hitlimit = 0; |
240 |
return; |
241 |
} |
242 |
o = objptr(obj); |
243 |
if (hitlimit || !ismodifier(o->otype)) |
244 |
return; |
245 |
for (amblp = amblist; *amblp != NULL; amblp++) |
246 |
if (!strcmp(o->oname, *amblp)) { |
247 |
if (ambset[0] >= MAXASET) { |
248 |
error(WARNING, "too many modifiers in ambient list"); |
249 |
hitlimit++; |
250 |
return; /* should this be fatal? */ |
251 |
} |
252 |
insertelem(ambset, obj); |
253 |
return; |
254 |
} |
255 |
} |
256 |
|
257 |
/************ THE FOLLOWING ROUTINES DIFFER BETWEEN NEW & OLD ***************/ |
258 |
|
259 |
#ifndef OLDAMB |
260 |
|
261 |
#define tfunc(lwr, x, upr) (((x)-(lwr))/((upr)-(lwr))) |
262 |
|
263 |
static int plugaleak(RAY *r, AMBVAL *ap, FVECT anorm, double ang); |
264 |
static double sumambient(COLOR acol, RAY *r, FVECT rn, int al, |
265 |
AMBTREE *at, FVECT c0, double s); |
266 |
static int makeambient(COLOR acol, RAY *r, FVECT rn, int al); |
267 |
static int extambient(COLOR cr, AMBVAL *ap, FVECT pv, FVECT nv, |
268 |
FVECT uvw[3]); |
269 |
|
270 |
void |
271 |
multambient( /* compute ambient component & multiply by coef. */ |
272 |
COLOR aval, |
273 |
RAY *r, |
274 |
FVECT nrm |
275 |
) |
276 |
{ |
277 |
static int rdepth = 0; /* ambient recursion */ |
278 |
COLOR acol, caustic; |
279 |
int ok; |
280 |
double d, l; |
281 |
|
282 |
/* PMAP: Factor in ambient from photon map, if enabled and ray is |
283 |
* ambient. Return as all ambient components accounted for, else |
284 |
* continue. */ |
285 |
if (ambPmap(aval, r, rdepth)) |
286 |
return; |
287 |
|
288 |
/* PMAP: Factor in specular-diffuse ambient (caustics) from photon |
289 |
* map, if enabled and ray is primary, else caustic is zero. Continue |
290 |
* with RADIANCE ambient calculation */ |
291 |
copycolor(caustic, aval); |
292 |
ambPmapCaustic(caustic, r, rdepth); |
293 |
|
294 |
if (ambdiv <= 0) /* no ambient calculation */ |
295 |
goto dumbamb; |
296 |
/* check number of bounces */ |
297 |
if (rdepth >= ambounce) |
298 |
goto dumbamb; |
299 |
/* check ambient list */ |
300 |
if (ambincl != -1 && r->ro != NULL && |
301 |
ambincl != inset(ambset, r->ro->omod)) |
302 |
goto dumbamb; |
303 |
|
304 |
if (ambacc <= FTINY) { /* no ambient storage */ |
305 |
copycolor(acol, aval); |
306 |
rdepth++; |
307 |
ok = doambient(acol, r, r->rweight, |
308 |
NULL, NULL, NULL, NULL, NULL); |
309 |
rdepth--; |
310 |
if (!ok) |
311 |
goto dumbamb; |
312 |
copycolor(aval, acol); |
313 |
|
314 |
/* PMAP: add in caustic */ |
315 |
addcolor(aval, caustic); |
316 |
return; |
317 |
} |
318 |
|
319 |
if (tracktime) /* sort to minimize thrashing */ |
320 |
sortambvals(0); |
321 |
/* interpolate ambient value */ |
322 |
setcolor(acol, 0.0, 0.0, 0.0); |
323 |
d = sumambient(acol, r, nrm, rdepth, |
324 |
&atrunk, thescene.cuorg, thescene.cusize); |
325 |
|
326 |
if (d > FTINY) { |
327 |
d = 1.0/d; |
328 |
scalecolor(acol, d); |
329 |
multcolor(aval, acol); |
330 |
|
331 |
/* PMAP: add in caustic */ |
332 |
addcolor(aval, caustic); |
333 |
return; |
334 |
} |
335 |
|
336 |
rdepth++; /* need to cache new value */ |
337 |
ok = makeambient(acol, r, nrm, rdepth-1); |
338 |
rdepth--; |
339 |
|
340 |
if (ok) { |
341 |
multcolor(aval, acol); /* computed new value */ |
342 |
|
343 |
/* PMAP: add in caustic */ |
344 |
addcolor(aval, caustic); |
345 |
return; |
346 |
} |
347 |
|
348 |
dumbamb: /* return global value */ |
349 |
if ((ambvwt <= 0) | (navsum == 0)) { |
350 |
multcolor(aval, ambval); |
351 |
|
352 |
/* PMAP: add in caustic */ |
353 |
addcolor(aval, caustic); |
354 |
return; |
355 |
} |
356 |
|
357 |
l = bright(ambval); /* average in computations */ |
358 |
if (l > FTINY) { |
359 |
d = (log(l)*(double)ambvwt + avsum) / |
360 |
(double)(ambvwt + navsum); |
361 |
d = exp(d) / l; |
362 |
scalecolor(aval, d); |
363 |
multcolor(aval, ambval); /* apply color of ambval */ |
364 |
} else { |
365 |
d = exp( avsum / (double)navsum ); |
366 |
scalecolor(aval, d); /* neutral color */ |
367 |
} |
368 |
} |
369 |
|
370 |
|
371 |
/* Plug a potential leak where ambient cache value is occluded */ |
372 |
static int |
373 |
plugaleak(RAY *r, AMBVAL *ap, FVECT anorm, double ang) |
374 |
{ |
375 |
const double cost70sq = 0.1169778; /* cos(70deg)^2 */ |
376 |
RAY rtst; |
377 |
FVECT vdif; |
378 |
double normdot, ndotd, nadotd; |
379 |
double a, b, c, t[2]; |
380 |
|
381 |
ang += 2.*PI*(ang < 0); /* check direction flags */ |
382 |
if ( !(ap->corral>>(int)(ang*(16./PI)) & 1) ) |
383 |
return(0); |
384 |
/* |
385 |
* Generate test ray, targeting 20 degrees above sample point plane |
386 |
* along surface normal from cache position. This should be high |
387 |
* enough to miss local geometry we don't really care about. |
388 |
*/ |
389 |
VSUB(vdif, ap->pos, r->rop); |
390 |
normdot = DOT(anorm, r->ron); |
391 |
ndotd = DOT(vdif, r->ron); |
392 |
nadotd = DOT(vdif, anorm); |
393 |
a = normdot*normdot - cost70sq; |
394 |
b = 2.0*(normdot*ndotd - nadotd*cost70sq); |
395 |
c = ndotd*ndotd - DOT(vdif,vdif)*cost70sq; |
396 |
if (quadratic(t, a, b, c) != 2) |
397 |
return(1); /* should rarely happen */ |
398 |
if (t[1] <= FTINY) |
399 |
return(0); /* should fail behind test */ |
400 |
rayorigin(&rtst, SHADOW, r, NULL); |
401 |
VSUM(rtst.rdir, vdif, anorm, t[1]); /* further dist. > plane */ |
402 |
rtst.rmax = normalize(rtst.rdir); /* short ray test */ |
403 |
while (localhit(&rtst, &thescene)) { /* check for occluder */ |
404 |
if (rtst.ro->omod != OVOID && |
405 |
(rtst.clipset == NULL || |
406 |
!inset(rtst.clipset, rtst.ro->omod))) |
407 |
return(1); /* plug light leak */ |
408 |
VCOPY(rtst.rorg, rtst.rop); /* skip invisible surface */ |
409 |
rtst.rmax -= rtst.rot; |
410 |
rayclear(&rtst); |
411 |
} |
412 |
return(0); /* seems we're OK */ |
413 |
} |
414 |
|
415 |
|
416 |
static double |
417 |
sumambient( /* get interpolated ambient value */ |
418 |
COLOR acol, |
419 |
RAY *r, |
420 |
FVECT rn, |
421 |
int al, |
422 |
AMBTREE *at, |
423 |
FVECT c0, |
424 |
double s |
425 |
) |
426 |
{ /* initial limit is 10 degrees plus ambacc radians */ |
427 |
const double minangle = 10.0 * PI/180.; |
428 |
double maxangle = minangle + ambacc; |
429 |
double wsum = 0.0; |
430 |
FVECT ck0; |
431 |
int i, j; |
432 |
AMBVAL *av; |
433 |
|
434 |
if (at->kid != NULL) { /* sum children first */ |
435 |
s *= 0.5; |
436 |
for (i = 0; i < 8; i++) { |
437 |
for (j = 0; j < 3; j++) { |
438 |
ck0[j] = c0[j]; |
439 |
if (1<<j & i) |
440 |
ck0[j] += s; |
441 |
if (r->rop[j] < ck0[j] - OCTSCALE*s) |
442 |
break; |
443 |
if (r->rop[j] > ck0[j] + (1.0+OCTSCALE)*s) |
444 |
break; |
445 |
} |
446 |
if (j == 3) |
447 |
wsum += sumambient(acol, r, rn, al, |
448 |
at->kid+i, ck0, s); |
449 |
} |
450 |
/* good enough? */ |
451 |
if (wsum >= 0.05 && s > minarad*10.0) |
452 |
return(wsum); |
453 |
} |
454 |
/* adjust maximum angle */ |
455 |
if (at->alist != NULL && (at->alist->lvl <= al) & (r->rweight < 0.6)) |
456 |
maxangle = (maxangle - PI/2.)*pow(r->rweight,0.13) + PI/2.; |
457 |
/* sum this node */ |
458 |
for (av = at->alist; av != NULL; av = av->next) { |
459 |
double u, v, d, delta_r2, delta_t2; |
460 |
COLOR ct; |
461 |
FVECT uvw[3]; |
462 |
/* record access */ |
463 |
if (tracktime) |
464 |
av->latick = ambclock; |
465 |
/* |
466 |
* Ambient level test |
467 |
*/ |
468 |
if (av->lvl > al || /* list sorted, so this works */ |
469 |
(av->lvl == al) & (av->weight < 0.9*r->rweight)) |
470 |
break; |
471 |
/* |
472 |
* Direction test using unperturbed normal |
473 |
*/ |
474 |
decodedir(uvw[2], av->ndir); |
475 |
d = DOT(uvw[2], r->ron); |
476 |
if (d <= 0.0) /* >= 90 degrees */ |
477 |
continue; |
478 |
delta_r2 = 2.0 - 2.0*d; /* approx. radians^2 */ |
479 |
if (delta_r2 >= maxangle*maxangle) |
480 |
continue; |
481 |
/* |
482 |
* Modified ray behind test |
483 |
*/ |
484 |
VSUB(ck0, r->rop, av->pos); |
485 |
d = DOT(ck0, uvw[2]); |
486 |
if (d < -minarad*ambacc-.001) |
487 |
continue; |
488 |
d /= av->rad[0]; |
489 |
delta_t2 = d*d; |
490 |
if (delta_t2 >= ambacc*ambacc) |
491 |
continue; |
492 |
/* |
493 |
* Elliptical radii test based on Hessian |
494 |
*/ |
495 |
decodedir(uvw[0], av->udir); |
496 |
VCROSS(uvw[1], uvw[2], uvw[0]); |
497 |
d = (u = DOT(ck0, uvw[0])) / av->rad[0]; |
498 |
delta_t2 += d*d; |
499 |
d = (v = DOT(ck0, uvw[1])) / av->rad[1]; |
500 |
delta_t2 += d*d; |
501 |
if (delta_t2 >= ambacc*ambacc) |
502 |
continue; |
503 |
/* |
504 |
* Test for potential light leak |
505 |
*/ |
506 |
if (av->corral && plugaleak(r, av, uvw[2], atan2a(v,u))) |
507 |
continue; |
508 |
/* |
509 |
* Extrapolate value and compute final weight (hat function) |
510 |
*/ |
511 |
if (!extambient(ct, av, r->rop, rn, uvw)) |
512 |
continue; |
513 |
d = tfunc(maxangle, sqrt(delta_r2), 0.0) * |
514 |
tfunc(ambacc, sqrt(delta_t2), 0.0); |
515 |
scalecolor(ct, d); |
516 |
addcolor(acol, ct); |
517 |
wsum += d; |
518 |
} |
519 |
return(wsum); |
520 |
} |
521 |
|
522 |
|
523 |
static int |
524 |
makeambient( /* make a new ambient value for storage */ |
525 |
COLOR acol, |
526 |
RAY *r, |
527 |
FVECT rn, |
528 |
int al |
529 |
) |
530 |
{ |
531 |
AMBVAL amb; |
532 |
FVECT uvw[3]; |
533 |
int i; |
534 |
|
535 |
amb.weight = 1.0; /* compute weight */ |
536 |
for (i = al; i-- > 0; ) |
537 |
amb.weight *= AVGREFL; |
538 |
if (r->rweight < 0.1*amb.weight) /* heuristic override */ |
539 |
amb.weight = 1.25*r->rweight; |
540 |
setcolor(acol, AVGREFL, AVGREFL, AVGREFL); |
541 |
/* compute ambient */ |
542 |
i = doambient(acol, r, amb.weight, |
543 |
uvw, amb.rad, amb.gpos, amb.gdir, &amb.corral); |
544 |
scalecolor(acol, 1./AVGREFL); /* undo assumed reflectance */ |
545 |
if (i <= 0 || amb.rad[0] <= FTINY) /* no Hessian or zero radius */ |
546 |
return(i); |
547 |
/* store value */ |
548 |
VCOPY(amb.pos, r->rop); |
549 |
amb.ndir = encodedir(r->ron); |
550 |
amb.udir = encodedir(uvw[0]); |
551 |
amb.lvl = al; |
552 |
copycolor(amb.val, acol); |
553 |
/* insert into tree */ |
554 |
avsave(&amb); /* and save to file */ |
555 |
if (rn != r->ron) { /* texture */ |
556 |
VCOPY(uvw[2], r->ron); |
557 |
extambient(acol, &amb, r->rop, rn, uvw); |
558 |
} |
559 |
return(1); |
560 |
} |
561 |
|
562 |
|
563 |
static int |
564 |
extambient( /* extrapolate value at pv, nv */ |
565 |
COLOR cr, |
566 |
AMBVAL *ap, |
567 |
FVECT pv, |
568 |
FVECT nv, |
569 |
FVECT uvw[3] |
570 |
) |
571 |
{ |
572 |
const double min_d = 0.05; |
573 |
static FVECT my_uvw[3]; |
574 |
FVECT v1; |
575 |
int i; |
576 |
double d = 1.0; /* zeroeth order */ |
577 |
|
578 |
if (uvw == NULL) { /* need local coordinates? */ |
579 |
decodedir(my_uvw[2], ap->ndir); |
580 |
decodedir(my_uvw[0], ap->udir); |
581 |
VCROSS(my_uvw[1], my_uvw[2], my_uvw[0]); |
582 |
uvw = my_uvw; |
583 |
} |
584 |
for (i = 3; i--; ) /* gradient due to translation */ |
585 |
d += (pv[i] - ap->pos[i]) * |
586 |
(ap->gpos[0]*uvw[0][i] + ap->gpos[1]*uvw[1][i]); |
587 |
|
588 |
VCROSS(v1, uvw[2], nv); /* gradient due to rotation */ |
589 |
for (i = 3; i--; ) |
590 |
d += v1[i] * (ap->gdir[0]*uvw[0][i] + ap->gdir[1]*uvw[1][i]); |
591 |
|
592 |
if (d < min_d) /* should not use if we can avoid it */ |
593 |
d = min_d; |
594 |
copycolor(cr, ap->val); |
595 |
scalecolor(cr, d); |
596 |
return(d > min_d); |
597 |
} |
598 |
|
599 |
|
600 |
static void |
601 |
avinsert( /* insert ambient value in our tree */ |
602 |
AMBVAL *av |
603 |
) |
604 |
{ |
605 |
AMBTREE *at; |
606 |
AMBVAL *ap; |
607 |
AMBVAL avh; |
608 |
FVECT ck0; |
609 |
double s; |
610 |
int branch; |
611 |
int i; |
612 |
|
613 |
if (av->rad[0] <= FTINY) |
614 |
error(CONSISTENCY, "zero ambient radius in avinsert"); |
615 |
at = &atrunk; |
616 |
VCOPY(ck0, thescene.cuorg); |
617 |
s = thescene.cusize; |
618 |
while (s*(OCTSCALE/2) > av->rad[1]*ambacc) { |
619 |
if (at->kid == NULL) |
620 |
if ((at->kid = newambtree()) == NULL) |
621 |
error(SYSTEM, "out of memory in avinsert"); |
622 |
s *= 0.5; |
623 |
branch = 0; |
624 |
for (i = 0; i < 3; i++) |
625 |
if (av->pos[i] > ck0[i] + s) { |
626 |
ck0[i] += s; |
627 |
branch |= 1 << i; |
628 |
} |
629 |
at = at->kid + branch; |
630 |
} |
631 |
avh.next = at->alist; /* order by increasing level */ |
632 |
for (ap = &avh; ap->next != NULL; ap = ap->next) |
633 |
if ( ap->next->lvl > av->lvl || |
634 |
(ap->next->lvl == av->lvl) & |
635 |
(ap->next->weight <= av->weight) ) |
636 |
break; |
637 |
av->next = ap->next; |
638 |
ap->next = (AMBVAL*)av; |
639 |
at->alist = avh.next; |
640 |
} |
641 |
|
642 |
|
643 |
#else /* ! NEWAMB */ |
644 |
|
645 |
static double sumambient(COLOR acol, RAY *r, FVECT rn, int al, |
646 |
AMBTREE *at, FVECT c0, double s); |
647 |
static double makeambient(COLOR acol, RAY *r, FVECT rn, int al); |
648 |
static void extambient(COLOR cr, AMBVAL *ap, FVECT pv, FVECT nv); |
649 |
|
650 |
|
651 |
void |
652 |
multambient( /* compute ambient component & multiply by coef. */ |
653 |
COLOR aval, |
654 |
RAY *r, |
655 |
FVECT nrm |
656 |
) |
657 |
{ |
658 |
static int rdepth = 0; /* ambient recursion */ |
659 |
COLOR acol, caustic; |
660 |
double d, l; |
661 |
|
662 |
/* PMAP: Factor in ambient from global photon map (if enabled) and return |
663 |
* as all ambient components accounted for */ |
664 |
if (ambPmap(aval, r, rdepth)) |
665 |
return; |
666 |
|
667 |
/* PMAP: Otherwise factor in ambient from caustic photon map |
668 |
* (ambPmapCaustic() returns zero if caustic photons disabled) and |
669 |
* continue with RADIANCE ambient calculation */ |
670 |
copycolor(caustic, aval); |
671 |
ambPmapCaustic(caustic, r, rdepth); |
672 |
|
673 |
if (ambdiv <= 0) /* no ambient calculation */ |
674 |
goto dumbamb; |
675 |
/* check number of bounces */ |
676 |
if (rdepth >= ambounce) |
677 |
goto dumbamb; |
678 |
/* check ambient list */ |
679 |
if (ambincl != -1 && r->ro != NULL && |
680 |
ambincl != inset(ambset, r->ro->omod)) |
681 |
goto dumbamb; |
682 |
|
683 |
if (ambacc <= FTINY) { /* no ambient storage */ |
684 |
copycolor(acol, aval); |
685 |
rdepth++; |
686 |
d = doambient(acol, r, r->rweight, NULL, NULL); |
687 |
rdepth--; |
688 |
if (d <= FTINY) |
689 |
goto dumbamb; |
690 |
copycolor(aval, acol); |
691 |
|
692 |
/* PMAP: add in caustic */ |
693 |
addcolor(aval, caustic); |
694 |
return; |
695 |
} |
696 |
|
697 |
if (tracktime) /* sort to minimize thrashing */ |
698 |
sortambvals(0); |
699 |
/* interpolate ambient value */ |
700 |
setcolor(acol, 0.0, 0.0, 0.0); |
701 |
d = sumambient(acol, r, nrm, rdepth, |
702 |
&atrunk, thescene.cuorg, thescene.cusize); |
703 |
|
704 |
if (d > FTINY) { |
705 |
d = 1.0/d; |
706 |
scalecolor(acol, d); |
707 |
multcolor(aval, acol); |
708 |
|
709 |
/* PMAP: add in caustic */ |
710 |
addcolor(aval, caustic); |
711 |
return; |
712 |
} |
713 |
|
714 |
rdepth++; /* need to cache new value */ |
715 |
d = makeambient(acol, r, nrm, rdepth-1); |
716 |
rdepth--; |
717 |
|
718 |
if (d > FTINY) { |
719 |
multcolor(aval, acol); /* got new value */ |
720 |
|
721 |
/* PMAP: add in caustic */ |
722 |
addcolor(aval, caustic); |
723 |
return; |
724 |
} |
725 |
|
726 |
dumbamb: /* return global value */ |
727 |
if ((ambvwt <= 0) | (navsum == 0)) { |
728 |
multcolor(aval, ambval); |
729 |
|
730 |
/* PMAP: add in caustic */ |
731 |
addcolor(aval, caustic); |
732 |
return; |
733 |
} |
734 |
|
735 |
l = bright(ambval); /* average in computations */ |
736 |
if (l > FTINY) { |
737 |
d = (log(l)*(double)ambvwt + avsum) / |
738 |
(double)(ambvwt + navsum); |
739 |
d = exp(d) / l; |
740 |
scalecolor(aval, d); |
741 |
multcolor(aval, ambval); /* apply color of ambval */ |
742 |
} else { |
743 |
d = exp( avsum / (double)navsum ); |
744 |
scalecolor(aval, d); /* neutral color */ |
745 |
} |
746 |
} |
747 |
|
748 |
|
749 |
static double |
750 |
sumambient( /* get interpolated ambient value */ |
751 |
COLOR acol, |
752 |
RAY *r, |
753 |
FVECT rn, |
754 |
int al, |
755 |
AMBTREE *at, |
756 |
FVECT c0, |
757 |
double s |
758 |
) |
759 |
{ |
760 |
double d, e1, e2, wt, wsum; |
761 |
COLOR ct; |
762 |
FVECT ck0; |
763 |
int i; |
764 |
int j; |
765 |
AMBVAL *av; |
766 |
|
767 |
wsum = 0.0; |
768 |
/* do this node */ |
769 |
for (av = at->alist; av != NULL; av = av->next) { |
770 |
double rn_dot = -2.0; |
771 |
if (tracktime) |
772 |
av->latick = ambclock; |
773 |
/* |
774 |
* Ambient level test. |
775 |
*/ |
776 |
if (av->lvl > al || /* list sorted, so this works */ |
777 |
(av->lvl == al) & (av->weight < 0.9*r->rweight)) |
778 |
break; |
779 |
/* |
780 |
* Ambient radius test. |
781 |
*/ |
782 |
VSUB(ck0, av->pos, r->rop); |
783 |
e1 = DOT(ck0, ck0) / (av->rad * av->rad); |
784 |
if (e1 > ambacc*ambacc*1.21) |
785 |
continue; |
786 |
/* |
787 |
* Direction test using closest normal. |
788 |
*/ |
789 |
d = DOT(av->dir, r->ron); |
790 |
if (rn != r->ron) { |
791 |
rn_dot = DOT(av->dir, rn); |
792 |
if (rn_dot > 1.0-FTINY) |
793 |
rn_dot = 1.0-FTINY; |
794 |
if (rn_dot >= d-FTINY) { |
795 |
d = rn_dot; |
796 |
rn_dot = -2.0; |
797 |
} |
798 |
} |
799 |
e2 = (1.0 - d) * r->rweight; |
800 |
if (e2 < 0.0) |
801 |
e2 = 0.0; |
802 |
else if (e1 + e2 > ambacc*ambacc*1.21) |
803 |
continue; |
804 |
/* |
805 |
* Ray behind test. |
806 |
*/ |
807 |
d = 0.0; |
808 |
for (j = 0; j < 3; j++) |
809 |
d += (r->rop[j] - av->pos[j]) * |
810 |
(av->dir[j] + r->ron[j]); |
811 |
if (d*0.5 < -minarad*ambacc-.001) |
812 |
continue; |
813 |
/* |
814 |
* Jittering final test reduces image artifacts. |
815 |
*/ |
816 |
e1 = sqrt(e1); |
817 |
e2 = sqrt(e2); |
818 |
wt = e1 + e2; |
819 |
if (wt > ambacc*(.9+.2*urand(9015+samplendx))) |
820 |
continue; |
821 |
/* |
822 |
* Recompute directional error using perturbed normal |
823 |
*/ |
824 |
if (rn_dot > 0.0) { |
825 |
e2 = sqrt((1.0 - rn_dot)*r->rweight); |
826 |
wt = e1 + e2; |
827 |
} |
828 |
if (wt <= 1e-3) |
829 |
wt = 1e3; |
830 |
else |
831 |
wt = 1.0 / wt; |
832 |
wsum += wt; |
833 |
extambient(ct, av, r->rop, rn); |
834 |
scalecolor(ct, wt); |
835 |
addcolor(acol, ct); |
836 |
} |
837 |
if (at->kid == NULL) |
838 |
return(wsum); |
839 |
/* do children */ |
840 |
s *= 0.5; |
841 |
for (i = 0; i < 8; i++) { |
842 |
for (j = 0; j < 3; j++) { |
843 |
ck0[j] = c0[j]; |
844 |
if (1<<j & i) |
845 |
ck0[j] += s; |
846 |
if (r->rop[j] < ck0[j] - OCTSCALE*s) |
847 |
break; |
848 |
if (r->rop[j] > ck0[j] + (1.0+OCTSCALE)*s) |
849 |
break; |
850 |
} |
851 |
if (j == 3) |
852 |
wsum += sumambient(acol, r, rn, al, |
853 |
at->kid+i, ck0, s); |
854 |
} |
855 |
return(wsum); |
856 |
} |
857 |
|
858 |
|
859 |
static double |
860 |
makeambient( /* make a new ambient value for storage */ |
861 |
COLOR acol, |
862 |
RAY *r, |
863 |
FVECT rn, |
864 |
int al |
865 |
) |
866 |
{ |
867 |
AMBVAL amb; |
868 |
FVECT gp, gd; |
869 |
int i; |
870 |
|
871 |
amb.weight = 1.0; /* compute weight */ |
872 |
for (i = al; i-- > 0; ) |
873 |
amb.weight *= AVGREFL; |
874 |
if (r->rweight < 0.1*amb.weight) /* heuristic override */ |
875 |
amb.weight = 1.25*r->rweight; |
876 |
setcolor(acol, AVGREFL, AVGREFL, AVGREFL); |
877 |
/* compute ambient */ |
878 |
amb.rad = doambient(acol, r, amb.weight, gp, gd); |
879 |
if (amb.rad <= FTINY) { |
880 |
setcolor(acol, 0.0, 0.0, 0.0); |
881 |
return(0.0); |
882 |
} |
883 |
scalecolor(acol, 1./AVGREFL); /* undo assumed reflectance */ |
884 |
/* store value */ |
885 |
VCOPY(amb.pos, r->rop); |
886 |
VCOPY(amb.dir, r->ron); |
887 |
amb.lvl = al; |
888 |
copycolor(amb.val, acol); |
889 |
VCOPY(amb.gpos, gp); |
890 |
VCOPY(amb.gdir, gd); |
891 |
/* insert into tree */ |
892 |
avsave(&amb); /* and save to file */ |
893 |
if (rn != r->ron) |
894 |
extambient(acol, &amb, r->rop, rn); /* texture */ |
895 |
return(amb.rad); |
896 |
} |
897 |
|
898 |
|
899 |
static void |
900 |
extambient( /* extrapolate value at pv, nv */ |
901 |
COLOR cr, |
902 |
AMBVAL *ap, |
903 |
FVECT pv, |
904 |
FVECT nv |
905 |
) |
906 |
{ |
907 |
FVECT v1; |
908 |
int i; |
909 |
double d; |
910 |
|
911 |
d = 1.0; /* zeroeth order */ |
912 |
/* gradient due to translation */ |
913 |
for (i = 0; i < 3; i++) |
914 |
d += ap->gpos[i]*(pv[i]-ap->pos[i]); |
915 |
/* gradient due to rotation */ |
916 |
VCROSS(v1, ap->dir, nv); |
917 |
d += DOT(ap->gdir, v1); |
918 |
if (d <= 0.0) { |
919 |
setcolor(cr, 0.0, 0.0, 0.0); |
920 |
return; |
921 |
} |
922 |
copycolor(cr, ap->val); |
923 |
scalecolor(cr, d); |
924 |
} |
925 |
|
926 |
|
927 |
static void |
928 |
avinsert( /* insert ambient value in our tree */ |
929 |
AMBVAL *av |
930 |
) |
931 |
{ |
932 |
AMBTREE *at; |
933 |
AMBVAL *ap; |
934 |
AMBVAL avh; |
935 |
FVECT ck0; |
936 |
double s; |
937 |
int branch; |
938 |
int i; |
939 |
|
940 |
if (av->rad <= FTINY) |
941 |
error(CONSISTENCY, "zero ambient radius in avinsert"); |
942 |
at = &atrunk; |
943 |
VCOPY(ck0, thescene.cuorg); |
944 |
s = thescene.cusize; |
945 |
while (s*(OCTSCALE/2) > av->rad*ambacc) { |
946 |
if (at->kid == NULL) |
947 |
if ((at->kid = newambtree()) == NULL) |
948 |
error(SYSTEM, "out of memory in avinsert"); |
949 |
s *= 0.5; |
950 |
branch = 0; |
951 |
for (i = 0; i < 3; i++) |
952 |
if (av->pos[i] > ck0[i] + s) { |
953 |
ck0[i] += s; |
954 |
branch |= 1 << i; |
955 |
} |
956 |
at = at->kid + branch; |
957 |
} |
958 |
avh.next = at->alist; /* order by increasing level */ |
959 |
for (ap = &avh; ap->next != NULL; ap = ap->next) |
960 |
if ( ap->next->lvl > av->lvl || |
961 |
(ap->next->lvl == av->lvl) & |
962 |
(ap->next->weight <= av->weight) ) |
963 |
break; |
964 |
av->next = ap->next; |
965 |
ap->next = (AMBVAL*)av; |
966 |
at->alist = avh.next; |
967 |
} |
968 |
|
969 |
#endif /* ! NEWAMB */ |
970 |
|
971 |
/************* FOLLOWING ROUTINES SAME FOR NEW & OLD METHODS ***************/ |
972 |
|
973 |
static void |
974 |
initambfile( /* initialize ambient file */ |
975 |
int cre8 |
976 |
) |
977 |
{ |
978 |
extern char *progname, *octname; |
979 |
static char *mybuf = NULL; |
980 |
|
981 |
#ifdef F_SETLKW |
982 |
aflock(cre8 ? F_WRLCK : F_RDLCK); |
983 |
#endif |
984 |
SET_FILE_BINARY(ambfp); |
985 |
if (mybuf == NULL) |
986 |
mybuf = (char *)bmalloc(BUFSIZ+8); |
987 |
setbuf(ambfp, mybuf); |
988 |
if (cre8) { /* new file */ |
989 |
newheader("RADIANCE", ambfp); |
990 |
fprintf(ambfp, "%s -av %g %g %g -aw %d -ab %d -aa %g ", |
991 |
progname, colval(ambval,RED), |
992 |
colval(ambval,GRN), colval(ambval,BLU), |
993 |
ambvwt, ambounce, ambacc); |
994 |
fprintf(ambfp, "-ad %d -as %d -ar %d ", |
995 |
ambdiv, ambssamp, ambres); |
996 |
if (octname != NULL) |
997 |
fputs(octname, ambfp); |
998 |
fputc('\n', ambfp); |
999 |
fprintf(ambfp, "SOFTWARE= %s\n", VersionID); |
1000 |
fputnow(ambfp); |
1001 |
fputformat(AMBFMT, ambfp); |
1002 |
fputc('\n', ambfp); |
1003 |
putambmagic(ambfp); |
1004 |
} else if (checkheader(ambfp, AMBFMT, NULL) < 0 || !hasambmagic(ambfp)) |
1005 |
error(USER, "bad ambient file"); |
1006 |
} |
1007 |
|
1008 |
|
1009 |
static void |
1010 |
avsave( /* insert and save an ambient value */ |
1011 |
AMBVAL *av |
1012 |
) |
1013 |
{ |
1014 |
avstore(av); |
1015 |
if (ambfp == NULL) |
1016 |
return; |
1017 |
if (writambval(av, ambfp) < 0) |
1018 |
goto writerr; |
1019 |
if (++nunflshed >= AMBFLUSH) |
1020 |
if (ambsync() == EOF) |
1021 |
goto writerr; |
1022 |
return; |
1023 |
writerr: |
1024 |
error(SYSTEM, "error writing to ambient file"); |
1025 |
} |
1026 |
|
1027 |
|
1028 |
static AMBVAL * |
1029 |
avstore( /* allocate memory and save aval */ |
1030 |
AMBVAL *aval |
1031 |
) |
1032 |
{ |
1033 |
AMBVAL *av; |
1034 |
double d; |
1035 |
|
1036 |
if ((av = newambval()) == NULL) |
1037 |
error(SYSTEM, "out of memory in avstore"); |
1038 |
*av = *aval; |
1039 |
av->latick = ambclock; |
1040 |
av->next = NULL; |
1041 |
nambvals++; |
1042 |
d = bright(av->val); |
1043 |
if (d > FTINY) { /* add to log sum for averaging */ |
1044 |
avsum += log(d); |
1045 |
navsum++; |
1046 |
} |
1047 |
avinsert(av); /* insert in our cache tree */ |
1048 |
return(av); |
1049 |
} |
1050 |
|
1051 |
|
1052 |
#define ATALLOCSZ 512 /* #/8 trees to allocate at once */ |
1053 |
|
1054 |
static AMBTREE *atfreelist = NULL; /* free ambient tree structures */ |
1055 |
|
1056 |
|
1057 |
static AMBTREE * |
1058 |
newambtree(void) /* allocate 8 ambient tree structs */ |
1059 |
{ |
1060 |
AMBTREE *atp, *upperlim; |
1061 |
|
1062 |
if (atfreelist == NULL) { /* get more nodes */ |
1063 |
atfreelist = (AMBTREE *)malloc(ATALLOCSZ*8*sizeof(AMBTREE)); |
1064 |
if (atfreelist == NULL) |
1065 |
return(NULL); |
1066 |
/* link new free list */ |
1067 |
upperlim = atfreelist + 8*(ATALLOCSZ-1); |
1068 |
for (atp = atfreelist; atp < upperlim; atp += 8) |
1069 |
atp->kid = atp + 8; |
1070 |
atp->kid = NULL; |
1071 |
} |
1072 |
atp = atfreelist; |
1073 |
atfreelist = atp->kid; |
1074 |
memset(atp, 0, 8*sizeof(AMBTREE)); |
1075 |
return(atp); |
1076 |
} |
1077 |
|
1078 |
|
1079 |
static void |
1080 |
freeambtree( /* free 8 ambient tree structs */ |
1081 |
AMBTREE *atp |
1082 |
) |
1083 |
{ |
1084 |
atp->kid = atfreelist; |
1085 |
atfreelist = atp; |
1086 |
} |
1087 |
|
1088 |
|
1089 |
static void |
1090 |
unloadatree( /* unload an ambient value tree */ |
1091 |
AMBTREE *at, |
1092 |
unloadtf_t *f |
1093 |
) |
1094 |
{ |
1095 |
AMBVAL *av; |
1096 |
int i; |
1097 |
/* transfer values at this node */ |
1098 |
for (av = at->alist; av != NULL; av = at->alist) { |
1099 |
at->alist = av->next; |
1100 |
av->next = NULL; |
1101 |
(*f)(av); |
1102 |
} |
1103 |
if (at->kid == NULL) |
1104 |
return; |
1105 |
for (i = 0; i < 8; i++) /* transfer and free children */ |
1106 |
unloadatree(at->kid+i, f); |
1107 |
freeambtree(at->kid); |
1108 |
at->kid = NULL; |
1109 |
} |
1110 |
|
1111 |
|
1112 |
static struct avl { |
1113 |
AMBVAL *p; |
1114 |
unsigned long t; |
1115 |
} *avlist1; /* ambient value list with ticks */ |
1116 |
static AMBVAL **avlist2; /* memory positions for sorting */ |
1117 |
static int i_avlist; /* index for lists */ |
1118 |
|
1119 |
static int alatcmp(const void *av1, const void *av2); |
1120 |
|
1121 |
static void |
1122 |
avfree(AMBVAL *av) |
1123 |
{ |
1124 |
free(av); |
1125 |
} |
1126 |
|
1127 |
static void |
1128 |
av2list( |
1129 |
AMBVAL *av |
1130 |
) |
1131 |
{ |
1132 |
#ifdef DEBUG |
1133 |
if (i_avlist >= nambvals) |
1134 |
error(CONSISTENCY, "too many ambient values in av2list1"); |
1135 |
#endif |
1136 |
avlist1[i_avlist].p = avlist2[i_avlist] = (AMBVAL*)av; |
1137 |
avlist1[i_avlist++].t = av->latick; |
1138 |
} |
1139 |
|
1140 |
|
1141 |
static int |
1142 |
alatcmp( /* compare ambient values for MRA */ |
1143 |
const void *av1, |
1144 |
const void *av2 |
1145 |
) |
1146 |
{ |
1147 |
long lc = ((struct avl *)av2)->t - ((struct avl *)av1)->t; |
1148 |
return(lc<0 ? -1 : lc>0 ? 1 : 0); |
1149 |
} |
1150 |
|
1151 |
|
1152 |
/* GW NOTE 2002/10/3: |
1153 |
* I used to compare AMBVAL pointers, but found that this was the |
1154 |
* cause of a serious consistency error with gcc, since the optimizer |
1155 |
* uses some dangerous trick in pointer subtraction that |
1156 |
* assumes pointers differ by exact struct size increments. |
1157 |
*/ |
1158 |
static int |
1159 |
aposcmp( /* compare ambient value positions */ |
1160 |
const void *avp1, |
1161 |
const void *avp2 |
1162 |
) |
1163 |
{ |
1164 |
long diff = *(char * const *)avp1 - *(char * const *)avp2; |
1165 |
if (diff < 0) |
1166 |
return(-1); |
1167 |
return(diff > 0); |
1168 |
} |
1169 |
|
1170 |
|
1171 |
static int |
1172 |
avlmemi( /* find list position from address */ |
1173 |
AMBVAL *avaddr |
1174 |
) |
1175 |
{ |
1176 |
AMBVAL **avlpp; |
1177 |
|
1178 |
avlpp = (AMBVAL **)bsearch(&avaddr, avlist2, |
1179 |
nambvals, sizeof(AMBVAL *), aposcmp); |
1180 |
if (avlpp == NULL) |
1181 |
error(CONSISTENCY, "address not found in avlmemi"); |
1182 |
return(avlpp - avlist2); |
1183 |
} |
1184 |
|
1185 |
|
1186 |
static void |
1187 |
sortambvals( /* resort ambient values */ |
1188 |
int always |
1189 |
) |
1190 |
{ |
1191 |
AMBTREE oldatrunk; |
1192 |
AMBVAL tav, *tap, *pnext; |
1193 |
int i, j; |
1194 |
/* see if it's time yet */ |
1195 |
if (!always && (ambclock++ < lastsort+sortintvl || |
1196 |
nambvals < SORT_THRESH)) |
1197 |
return; |
1198 |
/* |
1199 |
* The idea here is to minimize memory thrashing |
1200 |
* in VM systems by improving reference locality. |
1201 |
* We do this by periodically sorting our stored ambient |
1202 |
* values in memory in order of most recently to least |
1203 |
* recently accessed. This ordering was chosen so that new |
1204 |
* ambient values (which tend to be less important) go into |
1205 |
* higher memory with the infrequently accessed values. |
1206 |
* Since we expect our values to need sorting less |
1207 |
* frequently as the process continues, we double our |
1208 |
* waiting interval after each call. |
1209 |
* This routine is also called by setambacc() with |
1210 |
* the "always" parameter set to 1 so that the ambient |
1211 |
* tree will be rebuilt with the new accuracy parameter. |
1212 |
*/ |
1213 |
if (tracktime) { /* allocate pointer arrays to sort */ |
1214 |
avlist2 = (AMBVAL **)malloc(nambvals*sizeof(AMBVAL *)); |
1215 |
avlist1 = (struct avl *)malloc(nambvals*sizeof(struct avl)); |
1216 |
} else { |
1217 |
avlist2 = NULL; |
1218 |
avlist1 = NULL; |
1219 |
} |
1220 |
if (avlist1 == NULL) { /* no time tracking -- rebuild tree? */ |
1221 |
if (avlist2 != NULL) |
1222 |
free(avlist2); |
1223 |
if (always) { /* rebuild without sorting */ |
1224 |
oldatrunk = atrunk; |
1225 |
atrunk.alist = NULL; |
1226 |
atrunk.kid = NULL; |
1227 |
unloadatree(&oldatrunk, avinsert); |
1228 |
} |
1229 |
} else { /* sort memory by last access time */ |
1230 |
/* |
1231 |
* Sorting memory is tricky because it isn't contiguous. |
1232 |
* We have to sort an array of pointers by MRA and also |
1233 |
* by memory position. We then copy values in "loops" |
1234 |
* to minimize memory hits. Nevertheless, we will visit |
1235 |
* everyone at least twice, and this is an expensive process |
1236 |
* when we're thrashing, which is when we need to do it. |
1237 |
*/ |
1238 |
#ifdef DEBUG |
1239 |
sprintf(errmsg, "sorting %u ambient values at ambclock=%lu...", |
1240 |
nambvals, ambclock); |
1241 |
eputs(errmsg); |
1242 |
#endif |
1243 |
i_avlist = 0; |
1244 |
unloadatree(&atrunk, av2list); /* empty current tree */ |
1245 |
#ifdef DEBUG |
1246 |
if (i_avlist < nambvals) |
1247 |
error(CONSISTENCY, "missing ambient values in sortambvals"); |
1248 |
#endif |
1249 |
qsort(avlist1, nambvals, sizeof(struct avl), alatcmp); |
1250 |
qsort(avlist2, nambvals, sizeof(AMBVAL *), aposcmp); |
1251 |
for (i = 0; i < nambvals; i++) { |
1252 |
if (avlist1[i].p == NULL) |
1253 |
continue; |
1254 |
tap = avlist2[i]; |
1255 |
tav = *tap; |
1256 |
for (j = i; (pnext = avlist1[j].p) != tap; |
1257 |
j = avlmemi(pnext)) { |
1258 |
*(avlist2[j]) = *pnext; |
1259 |
avinsert(avlist2[j]); |
1260 |
avlist1[j].p = NULL; |
1261 |
} |
1262 |
*(avlist2[j]) = tav; |
1263 |
avinsert(avlist2[j]); |
1264 |
avlist1[j].p = NULL; |
1265 |
} |
1266 |
free(avlist1); |
1267 |
free(avlist2); |
1268 |
/* compute new sort interval */ |
1269 |
sortintvl = ambclock - lastsort; |
1270 |
if (sortintvl >= MAX_SORT_INTVL/2) |
1271 |
sortintvl = MAX_SORT_INTVL; |
1272 |
else |
1273 |
sortintvl <<= 1; /* wait twice as long next */ |
1274 |
#ifdef DEBUG |
1275 |
eputs("done\n"); |
1276 |
#endif |
1277 |
} |
1278 |
if (ambclock >= MAXACLOCK) |
1279 |
ambclock = MAXACLOCK/2; |
1280 |
lastsort = ambclock; |
1281 |
} |
1282 |
|
1283 |
|
1284 |
#ifdef F_SETLKW |
1285 |
|
1286 |
static void |
1287 |
aflock( /* lock/unlock ambient file */ |
1288 |
int typ |
1289 |
) |
1290 |
{ |
1291 |
static struct flock fls; /* static so initialized to zeroes */ |
1292 |
|
1293 |
if (typ == fls.l_type) /* already called? */ |
1294 |
return; |
1295 |
fls.l_type = typ; |
1296 |
if (fcntl(fileno(ambfp), F_SETLKW, &fls) < 0) |
1297 |
error(SYSTEM, "cannot (un)lock ambient file"); |
1298 |
} |
1299 |
|
1300 |
|
1301 |
int |
1302 |
ambsync(void) /* synchronize ambient file */ |
1303 |
{ |
1304 |
long flen; |
1305 |
AMBVAL avs; |
1306 |
int n; |
1307 |
|
1308 |
if (ambfp == NULL) /* no ambient file? */ |
1309 |
return(0); |
1310 |
/* gain appropriate access */ |
1311 |
aflock(nunflshed ? F_WRLCK : F_RDLCK); |
1312 |
/* see if file has grown */ |
1313 |
if ((flen = lseek(fileno(ambfp), (off_t)0, SEEK_END)) < 0) |
1314 |
goto seekerr; |
1315 |
if ((n = flen - lastpos) > 0) { /* file has grown */ |
1316 |
if (ambinp == NULL) { /* use duplicate filedes */ |
1317 |
ambinp = fdopen(dup(fileno(ambfp)), "r"); |
1318 |
if (ambinp == NULL) |
1319 |
error(SYSTEM, "fdopen failed in ambsync"); |
1320 |
} |
1321 |
if (fseek(ambinp, lastpos, SEEK_SET) < 0) |
1322 |
goto seekerr; |
1323 |
while (n >= AMBVALSIZ) { /* load contributed values */ |
1324 |
if (!readambval(&avs, ambinp)) { |
1325 |
sprintf(errmsg, |
1326 |
"ambient file \"%s\" corrupted near character %ld", |
1327 |
ambfile, flen - n); |
1328 |
error(WARNING, errmsg); |
1329 |
break; |
1330 |
} |
1331 |
avstore(&avs); |
1332 |
n -= AMBVALSIZ; |
1333 |
} |
1334 |
lastpos = flen - n; |
1335 |
/*** seek always as safety measure |
1336 |
if (n) ***/ /* alignment */ |
1337 |
if (lseek(fileno(ambfp), (off_t)lastpos, SEEK_SET) < 0) |
1338 |
goto seekerr; |
1339 |
} |
1340 |
n = fflush(ambfp); /* calls write() at last */ |
1341 |
if (n != EOF) |
1342 |
lastpos += (long)nunflshed*AMBVALSIZ; |
1343 |
else if ((lastpos = lseek(fileno(ambfp), (off_t)0, SEEK_CUR)) < 0) |
1344 |
goto seekerr; |
1345 |
|
1346 |
aflock(F_UNLCK); /* release file */ |
1347 |
nunflshed = 0; |
1348 |
return(n); |
1349 |
seekerr: |
1350 |
error(SYSTEM, "seek failed in ambsync"); |
1351 |
return -1; /* pro forma return */ |
1352 |
} |
1353 |
|
1354 |
#else /* ! F_SETLKW */ |
1355 |
|
1356 |
int |
1357 |
ambsync(void) /* flush ambient file */ |
1358 |
{ |
1359 |
if (ambfp == NULL) |
1360 |
return(0); |
1361 |
nunflshed = 0; |
1362 |
return(fflush(ambfp)); |
1363 |
} |
1364 |
|
1365 |
#endif /* ! F_SETLKW */ |