27 |
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28 |
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extern CUBE thescene; /* contains space boundaries */ |
29 |
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|
30 |
+ |
extern char *shm_boundary; /* shared memory boundary */ |
31 |
+ |
|
32 |
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#define MAXASET 511 /* maximum number of elements in ambient set */ |
33 |
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OBJECT ambset[MAXASET+1]={0}; /* ambient include/exclude set */ |
34 |
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|
40 |
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static FILE *ambfp = NULL; /* ambient file pointer */ |
41 |
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static int nunflshed = 0; /* number of unflushed ambient values */ |
42 |
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|
43 |
+ |
#ifndef SORT_THRESH |
44 |
+ |
#ifdef BIGMEM |
45 |
+ |
#define SORT_THRESH (6*(1L<<20)/sizeof(AMBVAL)) |
46 |
+ |
#else |
47 |
+ |
#define SORT_THRESH (2*(1L<<20)/sizeof(AMBVAL)) |
48 |
+ |
#endif |
49 |
+ |
#endif |
50 |
+ |
#ifndef SORT_INTVL |
51 |
+ |
#define SORT_INTVL (SORT_THRESH*2) |
52 |
+ |
#endif |
53 |
+ |
|
54 |
+ |
static long ambclock = 0; /* ambient access clock */ |
55 |
+ |
static int nambvals = 0; /* number of stored ambient values */ |
56 |
+ |
static long lastsort = 0; /* time of last value sort */ |
57 |
+ |
static long sortintvl = SORT_INTVL; /* time until next sort */ |
58 |
+ |
|
59 |
+ |
#define MAXACLOCK (1L<<30) /* clock turnover value */ |
60 |
+ |
#define tracktime (shm_boundary == NULL || ambfp == NULL) |
61 |
+ |
#define need2sort (ambclock > lastsort+sortintvl && \ |
62 |
+ |
nambvals > SORT_THRESH) |
63 |
+ |
|
64 |
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#define AMBFLUSH (BUFSIZ/AMBVALSIZ) |
65 |
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|
66 |
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#define newambval() (AMBVAL *)bmalloc(sizeof(AMBVAL)) |
67 |
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|
45 |
– |
#define newambtree() (AMBTREE *)calloc(8, sizeof(AMBTREE)) |
46 |
– |
#define freeambtree(t) free((char *)(t)) |
47 |
– |
|
68 |
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extern long ftell(), lseek(); |
69 |
< |
static int initambfile(), avsave(), avinsert(), loadatree(); |
69 |
> |
static int initambfile(), avsave(), avinsert(), sortambvals(); |
70 |
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static AMBVAL *avstore(); |
71 |
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#ifdef F_SETLKW |
72 |
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static aflock(); |
79 |
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ambres = ar < 0 ? 0 : ar; /* may be done already */ |
80 |
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/* set min & max radii */ |
81 |
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if (ar <= 0) { |
82 |
< |
minarad = 0.0; |
82 |
> |
minarad = 0; |
83 |
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maxarad = thescene.cusize / 2.0; |
84 |
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} else { |
85 |
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minarad = thescene.cusize / ar; |
86 |
< |
maxarad = 16.0 * minarad; /* heuristic */ |
86 |
> |
maxarad = 16 * minarad; /* heuristic */ |
87 |
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if (maxarad > thescene.cusize / 2.0) |
88 |
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maxarad = thescene.cusize / 2.0; |
89 |
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} |
90 |
< |
if (maxarad <= FTINY) |
91 |
< |
maxarad = .001; |
90 |
> |
if (minarad <= FTINY) |
91 |
> |
minarad = 10*FTINY; |
92 |
> |
if (maxarad <= minarad) |
93 |
> |
maxarad = 64 * minarad; |
94 |
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} |
95 |
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|
96 |
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|
98 |
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double newa; |
99 |
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{ |
100 |
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static double oldambacc = -1.0; |
79 |
– |
AMBTREE oldatrunk; |
101 |
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|
102 |
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ambacc = newa < 0.0 ? 0.0 : newa; /* may be done already */ |
103 |
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if (oldambacc < -FTINY) |
107 |
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if (ambacc <= FTINY) |
108 |
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return; /* cannot build new tree */ |
109 |
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/* else need to rebuild tree */ |
110 |
< |
copystruct(&oldatrunk, &atrunk); |
90 |
< |
atrunk.alist = NULL; |
91 |
< |
atrunk.kid = NULL; |
92 |
< |
loadatree(&oldatrunk); |
110 |
> |
sortambvals(1); |
111 |
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oldambacc = ambacc; /* remeber setting for next call */ |
112 |
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} |
113 |
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|
195 |
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return; |
196 |
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} |
197 |
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/* get ambient value */ |
198 |
+ |
if (need2sort) |
199 |
+ |
sortambvals(0); |
200 |
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setcolor(acol, 0.0, 0.0, 0.0); |
201 |
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d = sumambient(acol, r, rdepth, |
202 |
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&atrunk, thescene.cuorg, thescene.cusize); |
231 |
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/* do this node */ |
232 |
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wsum = 0.0; |
233 |
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for (av = at->alist; av != NULL; av = av->next) { |
234 |
+ |
if (tracktime) |
235 |
+ |
av->latick = ambclock++; |
236 |
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/* |
237 |
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* Ambient level test. |
238 |
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*/ |
239 |
< |
if (av->lvl > al || av->weight < r->rweight-FTINY) |
239 |
> |
if (av->lvl > al) /* list sorted, so this works */ |
240 |
> |
break; |
241 |
> |
if (av->weight < r->rweight-FTINY) |
242 |
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continue; |
243 |
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/* |
244 |
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* Ambient radius test. |
373 |
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#endif |
374 |
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setbuf(ambfp, bmalloc(BUFSIZ+8)); |
375 |
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if (creat) { /* new file */ |
376 |
+ |
newheader("RADIANCE", ambfp); |
377 |
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fprintf(ambfp, "%s -av %g %g %g -ab %d -aa %g ", |
378 |
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progname, colval(ambval,RED), |
379 |
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colval(ambval,GRN), colval(ambval,BLU), |
417 |
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if ((av = newambval()) == NULL) |
418 |
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error(SYSTEM, "out of memory in avstore"); |
419 |
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copystruct(av, aval); |
420 |
+ |
av->latick = ambclock; |
421 |
+ |
av->next = NULL; |
422 |
+ |
nambvals++; |
423 |
|
return(av); |
424 |
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} |
425 |
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|
426 |
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|
427 |
+ |
#define ATALLOCSZ 512 /* #/8 trees to allocate at once */ |
428 |
+ |
|
429 |
+ |
static AMBTREE *atfreelist = NULL; /* free ambient tree structures */ |
430 |
+ |
|
431 |
+ |
|
432 |
|
static |
433 |
+ |
AMBTREE * |
434 |
+ |
newambtree() /* allocate 8 ambient tree structs */ |
435 |
+ |
{ |
436 |
+ |
register AMBTREE *atp, *upperlim; |
437 |
+ |
|
438 |
+ |
if (atfreelist == NULL) { /* get more nodes */ |
439 |
+ |
atfreelist = (AMBTREE *)bmalloc(ATALLOCSZ*8*sizeof(AMBTREE)); |
440 |
+ |
if (atfreelist == NULL) |
441 |
+ |
return(NULL); |
442 |
+ |
/* link new free list */ |
443 |
+ |
upperlim = atfreelist + 8*(ATALLOCSZ-1); |
444 |
+ |
for (atp = atfreelist; atp < upperlim; atp += 8) |
445 |
+ |
atp->kid = atp + 8; |
446 |
+ |
atp->kid = NULL; |
447 |
+ |
} |
448 |
+ |
atp = atfreelist; |
449 |
+ |
atfreelist = atp->kid; |
450 |
+ |
bzero((char *)atp, 8*sizeof(AMBTREE)); |
451 |
+ |
return(atp); |
452 |
+ |
} |
453 |
+ |
|
454 |
+ |
|
455 |
+ |
static |
456 |
+ |
freeambtree(atp) /* free 8 ambient tree structs */ |
457 |
+ |
AMBTREE *atp; |
458 |
+ |
{ |
459 |
+ |
atp->kid = atfreelist; |
460 |
+ |
atfreelist = atp; |
461 |
+ |
} |
462 |
+ |
|
463 |
+ |
|
464 |
+ |
static |
465 |
|
avinsert(av) /* insert ambient value in our tree */ |
466 |
|
register AMBVAL *av; |
467 |
|
{ |
468 |
|
register AMBTREE *at; |
469 |
+ |
register AMBVAL *ap; |
470 |
+ |
AMBVAL avh; |
471 |
|
FVECT ck0; |
472 |
|
double s; |
473 |
|
int branch; |
491 |
|
} |
492 |
|
at = at->kid + branch; |
493 |
|
} |
494 |
< |
av->next = at->alist; |
495 |
< |
at->alist = av; |
494 |
> |
avh.next = at->alist; /* order by increasing level */ |
495 |
> |
for (ap = &avh; ap->next != NULL; ap = ap->next) |
496 |
> |
if (ap->next->lvl >= av->lvl) |
497 |
> |
break; |
498 |
> |
av->next = ap->next; |
499 |
> |
ap->next = av; |
500 |
> |
at->alist = avh.next; |
501 |
|
} |
502 |
|
|
503 |
|
|
504 |
|
static |
505 |
< |
loadatree(at) /* move tree to main store */ |
505 |
> |
unloadatree(at, f) /* unload an ambient value tree */ |
506 |
|
register AMBTREE *at; |
507 |
+ |
int (*f)(); |
508 |
|
{ |
509 |
|
register AMBVAL *av; |
510 |
|
register int i; |
511 |
|
/* transfer values at this node */ |
512 |
|
for (av = at->alist; av != NULL; av = at->alist) { |
513 |
|
at->alist = av->next; |
514 |
< |
avinsert(av); |
514 |
> |
(*f)(av); |
515 |
|
} |
516 |
|
if (at->kid == NULL) |
517 |
|
return; |
518 |
|
for (i = 0; i < 8; i++) /* transfer and free children */ |
519 |
< |
loadatree(at->kid+i); |
519 |
> |
unloadatree(at->kid+i, f); |
520 |
|
freeambtree(at->kid); |
521 |
+ |
at->kid = NULL; |
522 |
+ |
} |
523 |
+ |
|
524 |
+ |
|
525 |
+ |
static AMBVAL **avlist1, **avlist2; /* ambient value lists for sorting */ |
526 |
+ |
static int i_avlist; /* index for lists */ |
527 |
+ |
|
528 |
+ |
|
529 |
+ |
static |
530 |
+ |
av2list(av) |
531 |
+ |
AMBVAL *av; |
532 |
+ |
{ |
533 |
+ |
if (i_avlist >= nambvals) |
534 |
+ |
error(CONSISTENCY, "too many ambient values in av2list1"); |
535 |
+ |
avlist1[i_avlist] = avlist2[i_avlist] = av; |
536 |
+ |
i_avlist++; |
537 |
+ |
} |
538 |
+ |
|
539 |
+ |
|
540 |
+ |
static int |
541 |
+ |
alatcmp(avp1, avp2) /* compare ambient values for MRA */ |
542 |
+ |
AMBVAL **avp1, **avp2; |
543 |
+ |
{ |
544 |
+ |
return((**avp2).latick - (**avp1).latick); |
545 |
+ |
} |
546 |
+ |
|
547 |
+ |
|
548 |
+ |
static int |
549 |
+ |
aposcmp(avp1, avp2) /* compare ambient value positions */ |
550 |
+ |
AMBVAL **avp1, **avp2; |
551 |
+ |
{ |
552 |
+ |
return(*avp1 - *avp2); |
553 |
+ |
} |
554 |
+ |
|
555 |
+ |
|
556 |
+ |
static |
557 |
+ |
sortambvals(always) /* resort ambient values */ |
558 |
+ |
int always; |
559 |
+ |
{ |
560 |
+ |
AMBTREE oldatrunk; |
561 |
+ |
AMBVAL tav, *tap, *pnext; |
562 |
+ |
register int i, j; |
563 |
+ |
/* |
564 |
+ |
* The idea here is to minimize memory thrashing |
565 |
+ |
* in VM systems by improving reference locality. |
566 |
+ |
* We do this by periodically sorting our stored ambient |
567 |
+ |
* values in memory in order of most recently to least |
568 |
+ |
* recently accessed. This ordering was chosen so that new |
569 |
+ |
* ambient values (which tend to be less important) go into |
570 |
+ |
* higher memory with the infrequently accessed values. |
571 |
+ |
* Since we expect our values to need sorting less |
572 |
+ |
* frequently as the process continues, we double our |
573 |
+ |
* waiting interval after each call. |
574 |
+ |
* This routine is also called by setambacc() with |
575 |
+ |
* the "always" parameter set to 1 so that the ambient |
576 |
+ |
* tree will be rebuilt with the new accuracy parameter. |
577 |
+ |
*/ |
578 |
+ |
if (tracktime) { |
579 |
+ |
avlist1 = (AMBVAL **)malloc(nambvals*sizeof(AMBVAL *)); |
580 |
+ |
avlist2 = (AMBVAL **)malloc(nambvals*sizeof(AMBVAL *)); |
581 |
+ |
} else |
582 |
+ |
avlist1 = avlist2 = NULL; |
583 |
+ |
if (avlist2 == NULL) { /* rebuild tree? */ |
584 |
+ |
if (avlist1 != NULL) |
585 |
+ |
free((char *)avlist1); |
586 |
+ |
if (!always) |
587 |
+ |
return; |
588 |
+ |
copystruct(&oldatrunk, &atrunk); |
589 |
+ |
atrunk.alist = NULL; |
590 |
+ |
atrunk.kid = NULL; |
591 |
+ |
unloadatree(&oldatrunk, avinsert); |
592 |
+ |
} else { /* sort memory by last access time */ |
593 |
+ |
i_avlist = 0; |
594 |
+ |
unloadatree(&atrunk, av2list); /* empty current tree */ |
595 |
+ |
/* |
596 |
+ |
* Sorting memory is tricky because it isn't contiguous. |
597 |
+ |
* We have to sort an array of pointers by MRA and also |
598 |
+ |
* by memory position. We then copy values in "loops" |
599 |
+ |
* to minimize memory hits. Nevertheless, we will visit |
600 |
+ |
* everyone at least once, and this is an expensive process |
601 |
+ |
* when we're thrashing, which is when we need to do it. |
602 |
+ |
*/ |
603 |
+ |
qsort((char *)avlist1, nambvals, sizeof(AMBVAL *), alatcmp); |
604 |
+ |
qsort((char *)avlist2, nambvals, sizeof(AMBVAL *), aposcmp); |
605 |
+ |
for (i = 0; i < nambvals; i++) { |
606 |
+ |
if (avlist1[i] == NULL || avlist1[i] == avlist2[i]) |
607 |
+ |
continue; |
608 |
+ |
tap = avlist2[i]; |
609 |
+ |
copystruct(&tav, tap); |
610 |
+ |
for (j = i; (pnext = avlist1[j]) != tap; |
611 |
+ |
j = (AMBVAL **)bsearch((char *)&pnext, |
612 |
+ |
(char *)(avlist2+i),nambvals-i, |
613 |
+ |
sizeof(AMBVAL *),aposcmp) - |
614 |
+ |
avlist2) { |
615 |
+ |
copystruct(avlist2[j], pnext); |
616 |
+ |
avinsert(avlist2[j]); |
617 |
+ |
avlist1[j] = NULL; |
618 |
+ |
} |
619 |
+ |
copystruct(avlist2[j], &tav); |
620 |
+ |
avinsert(avlist2[j]); |
621 |
+ |
avlist1[j] = NULL; |
622 |
+ |
} |
623 |
+ |
free((char *)avlist1); |
624 |
+ |
free((char *)avlist2); |
625 |
+ |
if (sortintvl < MAXACLOCK/4) |
626 |
+ |
sortintvl <<= 1; /* wait twice as long next */ |
627 |
+ |
} |
628 |
+ |
if (ambclock >= MAXACLOCK) |
629 |
+ |
ambclock = MAXACLOCK/2; |
630 |
+ |
lastsort = ambclock; |
631 |
|
} |
632 |
|
|
633 |
|
|