56 |
|
#define MAX_SORT_INTVL (SORT_INTVL<<6) |
57 |
|
#endif |
58 |
|
|
59 |
< |
static COLOR avsum = BLKCOLOR; /* computed ambient value sum */ |
59 |
> |
static double avsum = 0.; /* computed ambient value sum (log) */ |
60 |
> |
static unsigned int navsum = 0; /* number of values in avsum */ |
61 |
|
static unsigned int nambvals = 0; /* total number of indirect values */ |
62 |
|
static unsigned int nambshare = 0; /* number of values from file */ |
63 |
|
static unsigned long ambclock = 0; /* ambient access clock */ |
70 |
|
* through memory on a multiprocessor, when we want to avoid |
71 |
|
* claiming our own memory (copy on write). Go ahead anyway |
72 |
|
* if more than two thirds of our values are unshared. |
73 |
+ |
* Compile with -Dtracktime=0 to turn this code off. |
74 |
|
*/ |
75 |
+ |
#ifndef tracktime |
76 |
|
#define tracktime (shm_boundary == NULL || nambvals > 3*nambshare) |
77 |
+ |
#endif |
78 |
|
|
79 |
|
#define AMBFLUSH (BUFSIZ/AMBVALSIZ) |
80 |
|
|
81 |
|
#define newambval() (AMBVAL *)bmalloc(sizeof(AMBVAL)) |
82 |
|
|
79 |
– |
extern long ftell(), lseek(); |
83 |
|
static int initambfile(), avsave(), avinsert(), sortambvals(), avlmemi(); |
84 |
|
static AMBVAL *avstore(); |
85 |
|
#ifdef F_SETLKW |
194 |
|
FVECT nrm; |
195 |
|
{ |
196 |
|
static int rdepth = 0; /* ambient recursion */ |
197 |
< |
double d; |
197 |
> |
double d, l; |
198 |
|
|
199 |
|
if (ambdiv <= 0) /* no ambient calculation */ |
200 |
|
goto dumbamb; |
232 |
|
return; |
233 |
|
dumbamb: /* return global value */ |
234 |
|
copycolor(acol, ambval); |
235 |
< |
if (ambvwt <= 0 | nambvals == 0) |
235 |
> |
if (ambvwt <= 0 | navsum == 0) |
236 |
|
return; |
237 |
< |
scalecolor(acol, (double)ambvwt); |
238 |
< |
addcolor(acol, avsum); /* average in computations */ |
239 |
< |
d = 1.0/(ambvwt+nambvals); |
240 |
< |
scalecolor(acol, d); |
237 |
> |
l = bright(ambval); /* average in computations */ |
238 |
> |
if (l > FTINY) { |
239 |
> |
d = (log(l)*(double)ambvwt + avsum) / |
240 |
> |
(double)(ambvwt + navsum); |
241 |
> |
d = exp(d) / l; |
242 |
> |
scalecolor(acol, d); /* apply color of ambval */ |
243 |
> |
} else { |
244 |
> |
d = exp( avsum / (double)navsum ); |
245 |
> |
setcolor(acol, d, d, d); /* neutral color */ |
246 |
> |
} |
247 |
|
} |
248 |
|
|
249 |
|
|
377 |
|
register AMBVAL *ap; |
378 |
|
FVECT pv, nv; |
379 |
|
{ |
380 |
< |
FVECT v1, v2; |
380 |
> |
FVECT v1; |
381 |
|
register int i; |
382 |
|
double d; |
383 |
|
|
386 |
|
for (i = 0; i < 3; i++) |
387 |
|
d += ap->gpos[i]*(pv[i]-ap->pos[i]); |
388 |
|
/* gradient due to rotation */ |
389 |
< |
VCOPY(v1, ap->dir); |
390 |
< |
fcross(v2, v1, nv); |
382 |
< |
d += DOT(ap->gdir, v2); |
389 |
> |
VCROSS(v1, ap->dir, nv); |
390 |
> |
d += DOT(ap->gdir, v1); |
391 |
|
if (d <= 0.0) { |
392 |
|
setcolor(cr, 0.0, 0.0, 0.0); |
393 |
|
return; |
451 |
|
register AMBVAL *aval; |
452 |
|
{ |
453 |
|
register AMBVAL *av; |
454 |
+ |
double d; |
455 |
|
|
456 |
|
if ((av = newambval()) == NULL) |
457 |
|
error(SYSTEM, "out of memory in avstore"); |
458 |
|
copystruct(av, aval); |
459 |
|
av->latick = ambclock; |
460 |
|
av->next = NULL; |
452 |
– |
addcolor(avsum, av->val); /* add to sum for averaging */ |
461 |
|
nambvals++; |
462 |
+ |
d = bright(av->val); |
463 |
+ |
if (d > FTINY) { /* add to log sum for averaging */ |
464 |
+ |
avsum += log(d); |
465 |
+ |
navsum++; |
466 |
+ |
} |
467 |
|
return(av); |
468 |
|
} |
469 |
|
|