60 |
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#endif |
61 |
|
|
62 |
|
static COLOR avsum = BLKCOLOR; /* computed ambient value sum */ |
63 |
< |
static unsigned int nambvals = 0; /* number of computed ambient values */ |
63 |
> |
static unsigned int nambvals = 0; /* total number of indirect values */ |
64 |
> |
static unsigned int nambshare = 0; /* number of values from file */ |
65 |
|
static unsigned long ambclock = 0; /* ambient access clock */ |
66 |
|
static unsigned long lastsort = 0; /* time of last value sort */ |
67 |
|
static long sortintvl = SORT_INTVL; /* time until next sort */ |
70 |
|
/* |
71 |
|
* Track access times unless we are sharing ambient values |
72 |
|
* through memory on a multiprocessor, when we want to avoid |
73 |
< |
* claiming our own memory (copy on write). |
73 |
> |
* claiming our own memory (copy on write). Go ahead anyway |
74 |
> |
* if more than two thirds of our values are unshared. |
75 |
|
*/ |
76 |
< |
#define tracktime (shm_boundary == NULL || ambfp == NULL) |
76 |
> |
#define tracktime (shm_boundary == NULL || nambvals > 3*nambshare) |
77 |
|
|
78 |
|
#define AMBFLUSH (BUFSIZ/AMBVALSIZ) |
79 |
|
|
111 |
|
setambacc(newa) /* set ambient accuracy */ |
112 |
|
double newa; |
113 |
|
{ |
114 |
< |
static double oldambacc = -1.0; |
114 |
> |
double ambdiff; |
115 |
|
|
116 |
< |
ambacc = newa < 0.0 ? 0.0 : newa; /* may be done already */ |
117 |
< |
if (oldambacc < -FTINY) |
118 |
< |
oldambacc = ambacc; /* do nothing first call */ |
119 |
< |
if (fabs(newa - oldambacc) < 0.01) |
120 |
< |
return; /* insignificant -- don't bother */ |
119 |
< |
if (ambacc <= FTINY) |
120 |
< |
return; /* cannot build new tree */ |
121 |
< |
/* else need to rebuild tree */ |
122 |
< |
sortambvals(1); |
123 |
< |
oldambacc = ambacc; /* remeber setting for next call */ |
116 |
> |
if (newa < 0.0) |
117 |
> |
newa = 0.0; |
118 |
> |
ambdiff = fabs(newa - ambacc); |
119 |
> |
if (ambdiff >= .01 && (ambacc = newa) > FTINY && nambvals > 0) |
120 |
> |
sortambvals(1); /* rebuild tree */ |
121 |
|
} |
122 |
|
|
123 |
|
|
145 |
|
avinsert(avstore(&amb)); |
146 |
|
/* align */ |
147 |
|
fseek(ambfp, -((ftell(ambfp)-headlen)%AMBVALSIZ), 1); |
148 |
+ |
nambshare = nambvals; |
149 |
|
} else if ((ambfp = fopen(afile, "w+")) != NULL) |
150 |
|
initambfile(1); |
151 |
|
else { |
179 |
|
} |
180 |
|
|
181 |
|
|
182 |
< |
ambient(acol, r) /* compute ambient component for ray */ |
182 |
> |
ambient(acol, r, nrm) /* compute ambient component for ray */ |
183 |
|
COLOR acol; |
184 |
|
register RAY *r; |
185 |
+ |
FVECT nrm; |
186 |
|
{ |
187 |
|
static int rdepth = 0; /* ambient recursion */ |
188 |
|
double d; |
209 |
|
sortambvals(0); |
210 |
|
/* get ambient value */ |
211 |
|
setcolor(acol, 0.0, 0.0, 0.0); |
212 |
< |
d = sumambient(acol, r, rdepth, |
212 |
> |
d = sumambient(acol, r, nrm, rdepth, |
213 |
|
&atrunk, thescene.cuorg, thescene.cusize); |
214 |
|
if (d > FTINY) { |
215 |
|
scalecolor(acol, 1.0/d); |
216 |
|
return; |
217 |
|
} |
218 |
< |
rdepth++; |
219 |
< |
d = makeambient(acol, r, rdepth-1); |
218 |
> |
rdepth++; /* need to cache new value */ |
219 |
> |
d = makeambient(acol, r, nrm, rdepth-1); |
220 |
|
rdepth--; |
221 |
|
if (d > FTINY) |
222 |
|
return; |
234 |
|
|
235 |
|
|
236 |
|
double |
237 |
< |
sumambient(acol, r, al, at, c0, s) /* get interpolated ambient value */ |
237 |
> |
sumambient(acol, r, rn, al, at, c0, s) /* get interpolated ambient value */ |
238 |
|
COLOR acol; |
239 |
|
register RAY *r; |
240 |
+ |
FVECT rn; |
241 |
|
int al; |
242 |
|
AMBTREE *at; |
243 |
|
FVECT c0; |
301 |
|
else |
302 |
|
wt = 1.0 / wt; |
303 |
|
wsum += wt; |
304 |
< |
extambient(ct, av, r->rop, r->ron); |
304 |
> |
extambient(ct, av, r->rop, rn); |
305 |
|
scalecolor(ct, wt); |
306 |
|
addcolor(acol, ct); |
307 |
|
} |
320 |
|
break; |
321 |
|
} |
322 |
|
if (j == 3) |
323 |
< |
wsum += sumambient(acol, r, al, at->kid+i, ck0, s); |
323 |
> |
wsum += sumambient(acol, r, rn, al, at->kid+i, ck0, s); |
324 |
|
} |
325 |
|
return(wsum); |
326 |
|
} |
327 |
|
|
328 |
|
|
329 |
|
double |
330 |
< |
makeambient(acol, r, al) /* make a new ambient value */ |
330 |
> |
makeambient(acol, r, rn, al) /* make a new ambient value */ |
331 |
|
COLOR acol; |
332 |
|
register RAY *r; |
333 |
+ |
FVECT rn; |
334 |
|
int al; |
335 |
|
{ |
336 |
|
AMBVAL amb; |
337 |
|
FVECT gp, gd; |
338 |
|
/* compute weight */ |
339 |
|
amb.weight = pow(AVGREFL, (double)al); |
340 |
< |
if (r->rweight < 0.2*amb.weight) /* heuristic */ |
340 |
> |
if (r->rweight < 0.1*amb.weight) /* heuristic */ |
341 |
|
amb.weight = r->rweight; |
342 |
|
/* compute ambient */ |
343 |
|
amb.rad = doambient(acol, r, amb.weight, gp, gd); |
344 |
< |
if (amb.rad == 0.0) |
344 |
> |
if (amb.rad <= FTINY) |
345 |
|
return(0.0); |
346 |
|
/* store it */ |
347 |
|
VCOPY(amb.pos, r->rop); |
352 |
|
VCOPY(amb.gdir, gd); |
353 |
|
/* insert into tree */ |
354 |
|
avsave(&amb); /* and save to file */ |
355 |
+ |
if (rn != r->ron) |
356 |
+ |
extambient(acol, &amb, r->rop, rn); /* texture */ |
357 |
|
return(amb.rad); |
358 |
|
} |
359 |
|
|