| 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 |
|
|
| 195 |
|
FVECT nrm; |
| 196 |
|
{ |
| 197 |
|
static int rdepth = 0; /* ambient recursion */ |
| 198 |
< |
double d; |
| 198 |
> |
double d, l; |
| 199 |
|
|
| 200 |
|
if (ambdiv <= 0) /* no ambient calculation */ |
| 201 |
|
goto dumbamb; |
| 233 |
|
return; |
| 234 |
|
dumbamb: /* return global value */ |
| 235 |
|
copycolor(acol, ambval); |
| 236 |
< |
if (ambvwt <= 0 | nambvals == 0) |
| 236 |
> |
if (ambvwt <= 0 | navsum == 0) |
| 237 |
|
return; |
| 238 |
< |
scalecolor(acol, (double)ambvwt); |
| 239 |
< |
addcolor(acol, avsum); /* average in computations */ |
| 240 |
< |
d = 1.0/(ambvwt+nambvals); |
| 241 |
< |
scalecolor(acol, d); |
| 238 |
> |
l = bright(ambval); /* average in computations */ |
| 239 |
> |
if (l > FTINY) { |
| 240 |
> |
d = (log(l)*(double)ambvwt + avsum) / |
| 241 |
> |
(double)(ambvwt + navsum); |
| 242 |
> |
d = exp(d) / l; |
| 243 |
> |
scalecolor(acol, d); /* apply color of ambval */ |
| 244 |
> |
} else { |
| 245 |
> |
d = exp( avsum / (double)navsum ); |
| 246 |
> |
setcolor(acol, d, d, d); /* neutral color */ |
| 247 |
> |
} |
| 248 |
|
} |
| 249 |
|
|
| 250 |
|
|
| 453 |
|
register AMBVAL *aval; |
| 454 |
|
{ |
| 455 |
|
register AMBVAL *av; |
| 456 |
+ |
double d; |
| 457 |
|
|
| 458 |
|
if ((av = newambval()) == NULL) |
| 459 |
|
error(SYSTEM, "out of memory in avstore"); |
| 460 |
|
copystruct(av, aval); |
| 461 |
|
av->latick = ambclock; |
| 462 |
|
av->next = NULL; |
| 452 |
– |
addcolor(avsum, av->val); /* add to sum for averaging */ |
| 463 |
|
nambvals++; |
| 464 |
+ |
d = bright(av->val); |
| 465 |
+ |
if (d > FTINY) { /* add to log sum for averaging */ |
| 466 |
+ |
avsum += log(d); |
| 467 |
+ |
navsum++; |
| 468 |
+ |
} |
| 469 |
|
return(av); |
| 470 |
|
} |
| 471 |
|
|
