1 |
greg |
2.115 |
static const char RCSid[] = "$Id: ambient.c,v 2.114 2022/04/11 00:45:30 greg Exp $"; |
2 |
greg |
1.1 |
/* |
3 |
|
|
* ambient.c - routines dealing with ambient (inter-reflected) component. |
4 |
greg |
2.47 |
* |
5 |
|
|
* Declarations of external symbols in ambient.h |
6 |
|
|
*/ |
7 |
|
|
|
8 |
greg |
2.48 |
#include "copyright.h" |
9 |
greg |
1.1 |
|
10 |
schorsch |
2.52 |
#include <string.h> |
11 |
|
|
|
12 |
schorsch |
2.50 |
#include "platform.h" |
13 |
greg |
1.1 |
#include "ray.h" |
14 |
greg |
1.8 |
#include "otypes.h" |
15 |
greg |
2.105 |
#include "otspecial.h" |
16 |
schorsch |
2.56 |
#include "resolu.h" |
17 |
greg |
1.14 |
#include "ambient.h" |
18 |
greg |
1.1 |
#include "random.h" |
19 |
greg |
2.94 |
#include "pmapamb.h" |
20 |
greg |
1.1 |
|
21 |
greg |
2.32 |
#ifndef OCTSCALE |
22 |
greg |
2.29 |
#define OCTSCALE 1.0 /* ceil((valid rad.)/(cube size)) */ |
23 |
greg |
2.32 |
#endif |
24 |
greg |
1.1 |
|
25 |
greg |
2.57 |
#ifndef MAXASET |
26 |
greg |
2.67 |
#define MAXASET 4095 /* maximum number of elements in ambient set */ |
27 |
greg |
2.57 |
#endif |
28 |
greg |
2.12 |
OBJECT ambset[MAXASET+1]={0}; /* ambient include/exclude set */ |
29 |
greg |
1.1 |
|
30 |
greg |
2.12 |
double maxarad; /* maximum ambient radius */ |
31 |
|
|
double minarad; /* minimum ambient radius */ |
32 |
greg |
1.1 |
|
33 |
greg |
2.12 |
static AMBTREE atrunk; /* our ambient trunk node */ |
34 |
greg |
1.1 |
|
35 |
|
|
static FILE *ambfp = NULL; /* ambient file pointer */ |
36 |
greg |
2.16 |
static int nunflshed = 0; /* number of unflushed ambient values */ |
37 |
greg |
1.1 |
|
38 |
gregl |
2.43 |
static double avsum = 0.; /* computed ambient value sum (log) */ |
39 |
|
|
static unsigned int navsum = 0; /* number of values in avsum */ |
40 |
greg |
2.35 |
static unsigned int nambvals = 0; /* total number of indirect values */ |
41 |
|
|
static unsigned int nambshare = 0; /* number of values from file */ |
42 |
greg |
2.47 |
static FILE *ambinp = NULL; /* auxiliary file for input */ |
43 |
|
|
static long lastpos = -1; /* last flush position */ |
44 |
greg |
2.26 |
|
45 |
greg |
2.12 |
#define AMBFLUSH (BUFSIZ/AMBVALSIZ) |
46 |
greg |
2.6 |
|
47 |
greg |
2.47 |
#define newambval() (AMBVAL *)malloc(sizeof(AMBVAL)) |
48 |
greg |
1.1 |
|
49 |
greg |
2.108 |
#define tfunc(lwr, x, upr) (((x)-(lwr))/((upr)-(lwr))) |
50 |
|
|
|
51 |
schorsch |
2.56 |
static void initambfile(int creat); |
52 |
|
|
static void avsave(AMBVAL *av); |
53 |
|
|
static AMBVAL *avstore(AMBVAL *aval); |
54 |
|
|
static AMBTREE *newambtree(void); |
55 |
|
|
static void freeambtree(AMBTREE *atp); |
56 |
|
|
|
57 |
greg |
2.71 |
typedef void unloadtf_t(AMBVAL *); |
58 |
schorsch |
2.56 |
static unloadtf_t avinsert; |
59 |
greg |
2.71 |
static unloadtf_t avfree; |
60 |
schorsch |
2.56 |
static void unloadatree(AMBTREE *at, unloadtf_t *f); |
61 |
|
|
|
62 |
greg |
2.112 |
static void sortambvals(void); |
63 |
schorsch |
2.56 |
|
64 |
greg |
2.108 |
static int plugaleak(RAY *r, AMBVAL *ap, FVECT anorm, double ang); |
65 |
|
|
static double sumambient(COLOR acol, RAY *r, FVECT rn, int al, |
66 |
|
|
AMBTREE *at, FVECT c0, double s); |
67 |
|
|
static int makeambient(COLOR acol, RAY *r, FVECT rn, int al); |
68 |
|
|
static int extambient(COLOR cr, AMBVAL *ap, FVECT pv, FVECT nv, |
69 |
|
|
FVECT uvw[3]); |
70 |
|
|
|
71 |
greg |
2.19 |
#ifdef F_SETLKW |
72 |
schorsch |
2.56 |
static void aflock(int typ); |
73 |
greg |
2.19 |
#endif |
74 |
greg |
1.1 |
|
75 |
greg |
2.7 |
|
76 |
greg |
2.71 |
void |
77 |
schorsch |
2.56 |
setambres( /* set ambient resolution */ |
78 |
|
|
int ar |
79 |
|
|
) |
80 |
greg |
2.3 |
{ |
81 |
greg |
2.21 |
ambres = ar < 0 ? 0 : ar; /* may be done already */ |
82 |
greg |
2.3 |
/* set min & max radii */ |
83 |
|
|
if (ar <= 0) { |
84 |
greg |
2.25 |
minarad = 0; |
85 |
greg |
2.89 |
maxarad = thescene.cusize*0.2; |
86 |
greg |
2.3 |
} else { |
87 |
|
|
minarad = thescene.cusize / ar; |
88 |
greg |
2.83 |
maxarad = 64.0 * minarad; /* heuristic */ |
89 |
greg |
2.89 |
if (maxarad > thescene.cusize*0.2) |
90 |
|
|
maxarad = thescene.cusize*0.2; |
91 |
greg |
2.3 |
} |
92 |
greg |
2.25 |
if (minarad <= FTINY) |
93 |
greg |
2.83 |
minarad = 10.0*FTINY; |
94 |
greg |
2.25 |
if (maxarad <= minarad) |
95 |
greg |
2.83 |
maxarad = 64.0 * minarad; |
96 |
greg |
2.3 |
} |
97 |
|
|
|
98 |
|
|
|
99 |
greg |
2.71 |
void |
100 |
schorsch |
2.56 |
setambacc( /* set ambient accuracy */ |
101 |
|
|
double newa |
102 |
|
|
) |
103 |
greg |
2.20 |
{ |
104 |
greg |
2.84 |
static double olda; /* remember previous setting here */ |
105 |
greg |
2.82 |
|
106 |
|
|
newa *= (newa > 0); |
107 |
|
|
if (fabs(newa - olda) >= .05*(newa + olda)) { |
108 |
greg |
2.84 |
ambacc = newa; |
109 |
greg |
2.107 |
if (ambacc > FTINY && nambvals > 0) |
110 |
greg |
2.112 |
sortambvals(); /* rebuild tree */ |
111 |
greg |
2.74 |
} |
112 |
greg |
2.20 |
} |
113 |
|
|
|
114 |
|
|
|
115 |
greg |
2.71 |
void |
116 |
schorsch |
2.56 |
setambient(void) /* initialize calculation */ |
117 |
greg |
1.1 |
{ |
118 |
gwlarson |
2.46 |
int readonly = 0; |
119 |
greg |
2.66 |
long flen; |
120 |
greg |
2.12 |
AMBVAL amb; |
121 |
greg |
2.47 |
/* make sure we're fresh */ |
122 |
|
|
ambdone(); |
123 |
greg |
2.3 |
/* init ambient limits */ |
124 |
|
|
setambres(ambres); |
125 |
greg |
2.82 |
setambacc(ambacc); |
126 |
greg |
2.47 |
if (ambfile == NULL || !ambfile[0]) |
127 |
greg |
2.19 |
return; |
128 |
greg |
2.20 |
if (ambacc <= FTINY) { |
129 |
greg |
2.21 |
sprintf(errmsg, "zero ambient accuracy so \"%s\" not opened", |
130 |
greg |
2.47 |
ambfile); |
131 |
greg |
2.20 |
error(WARNING, errmsg); |
132 |
|
|
return; |
133 |
|
|
} |
134 |
greg |
2.3 |
/* open ambient file */ |
135 |
greg |
2.47 |
if ((ambfp = fopen(ambfile, "r+")) == NULL) |
136 |
|
|
readonly = (ambfp = fopen(ambfile, "r")) != NULL; |
137 |
gwlarson |
2.46 |
if (ambfp != NULL) { |
138 |
|
|
initambfile(0); /* file exists */ |
139 |
greg |
2.66 |
lastpos = ftell(ambfp); |
140 |
greg |
2.19 |
while (readambval(&amb, ambfp)) |
141 |
greg |
2.88 |
avstore(&amb); |
142 |
gwlarson |
2.46 |
nambshare = nambvals; /* share loaded values */ |
143 |
|
|
if (readonly) { |
144 |
|
|
sprintf(errmsg, |
145 |
|
|
"loaded %u values from read-only ambient file", |
146 |
|
|
nambvals); |
147 |
|
|
error(WARNING, errmsg); |
148 |
|
|
fclose(ambfp); /* close file so no writes */ |
149 |
|
|
ambfp = NULL; |
150 |
|
|
return; /* avoid ambsync() */ |
151 |
|
|
} |
152 |
|
|
/* align file pointer */ |
153 |
greg |
2.66 |
lastpos += (long)nambvals*AMBVALSIZ; |
154 |
greg |
2.55 |
flen = lseek(fileno(ambfp), (off_t)0, SEEK_END); |
155 |
greg |
2.66 |
if (flen != lastpos) { |
156 |
greg |
2.42 |
sprintf(errmsg, |
157 |
greg |
2.37 |
"ignoring last %ld values in ambient file (corrupted)", |
158 |
greg |
2.66 |
(flen - lastpos)/AMBVALSIZ); |
159 |
greg |
2.42 |
error(WARNING, errmsg); |
160 |
greg |
2.66 |
fseek(ambfp, lastpos, SEEK_SET); |
161 |
|
|
ftruncate(fileno(ambfp), (off_t)lastpos); |
162 |
greg |
2.37 |
} |
163 |
greg |
2.47 |
} else if ((ambfp = fopen(ambfile, "w+")) != NULL) { |
164 |
gwlarson |
2.46 |
initambfile(1); /* else create new file */ |
165 |
greg |
2.68 |
fflush(ambfp); |
166 |
greg |
2.66 |
lastpos = ftell(ambfp); |
167 |
gwlarson |
2.46 |
} else { |
168 |
greg |
2.47 |
sprintf(errmsg, "cannot open ambient file \"%s\"", ambfile); |
169 |
greg |
2.19 |
error(SYSTEM, errmsg); |
170 |
greg |
2.16 |
} |
171 |
greg |
2.68 |
#ifdef F_SETLKW |
172 |
|
|
aflock(F_UNLCK); /* release file */ |
173 |
|
|
#endif |
174 |
greg |
1.8 |
} |
175 |
|
|
|
176 |
|
|
|
177 |
greg |
2.71 |
void |
178 |
schorsch |
2.56 |
ambdone(void) /* close ambient file and free memory */ |
179 |
greg |
2.47 |
{ |
180 |
|
|
if (ambfp != NULL) { /* close ambient file */ |
181 |
|
|
ambsync(); |
182 |
|
|
fclose(ambfp); |
183 |
|
|
ambfp = NULL; |
184 |
|
|
if (ambinp != NULL) { |
185 |
|
|
fclose(ambinp); |
186 |
|
|
ambinp = NULL; |
187 |
|
|
} |
188 |
|
|
lastpos = -1; |
189 |
|
|
} |
190 |
|
|
/* free ambient tree */ |
191 |
greg |
2.99 |
unloadatree(&atrunk, avfree); |
192 |
greg |
2.47 |
/* reset state variables */ |
193 |
|
|
avsum = 0.; |
194 |
|
|
navsum = 0; |
195 |
|
|
nambvals = 0; |
196 |
|
|
nambshare = 0; |
197 |
|
|
} |
198 |
|
|
|
199 |
|
|
|
200 |
greg |
2.71 |
void |
201 |
schorsch |
2.56 |
ambnotify( /* record new modifier */ |
202 |
|
|
OBJECT obj |
203 |
|
|
) |
204 |
greg |
1.8 |
{ |
205 |
greg |
1.11 |
static int hitlimit = 0; |
206 |
greg |
2.70 |
OBJREC *o; |
207 |
|
|
char **amblp; |
208 |
greg |
1.8 |
|
209 |
greg |
2.47 |
if (obj == OVOID) { /* starting over */ |
210 |
|
|
ambset[0] = 0; |
211 |
|
|
hitlimit = 0; |
212 |
|
|
return; |
213 |
|
|
} |
214 |
|
|
o = objptr(obj); |
215 |
greg |
1.11 |
if (hitlimit || !ismodifier(o->otype)) |
216 |
greg |
1.8 |
return; |
217 |
|
|
for (amblp = amblist; *amblp != NULL; amblp++) |
218 |
|
|
if (!strcmp(o->oname, *amblp)) { |
219 |
greg |
1.11 |
if (ambset[0] >= MAXASET) { |
220 |
|
|
error(WARNING, "too many modifiers in ambient list"); |
221 |
|
|
hitlimit++; |
222 |
|
|
return; /* should this be fatal? */ |
223 |
|
|
} |
224 |
greg |
1.8 |
insertelem(ambset, obj); |
225 |
|
|
return; |
226 |
greg |
1.1 |
} |
227 |
|
|
} |
228 |
|
|
|
229 |
greg |
2.71 |
|
230 |
|
|
void |
231 |
|
|
multambient( /* compute ambient component & multiply by coef. */ |
232 |
|
|
COLOR aval, |
233 |
|
|
RAY *r, |
234 |
|
|
FVECT nrm |
235 |
|
|
) |
236 |
|
|
{ |
237 |
greg |
2.111 |
static double logAvgAbsorp = 1; |
238 |
greg |
2.71 |
static int rdepth = 0; /* ambient recursion */ |
239 |
greg |
2.94 |
COLOR acol, caustic; |
240 |
greg |
2.103 |
int i, ok; |
241 |
greg |
2.71 |
double d, l; |
242 |
|
|
|
243 |
greg |
2.94 |
/* PMAP: Factor in ambient from photon map, if enabled and ray is |
244 |
|
|
* ambient. Return as all ambient components accounted for, else |
245 |
|
|
* continue. */ |
246 |
|
|
if (ambPmap(aval, r, rdepth)) |
247 |
|
|
return; |
248 |
|
|
|
249 |
greg |
2.111 |
if (logAvgAbsorp > 0) /* exclude in -aw to avoid growth */ |
250 |
|
|
logAvgAbsorp = log(1.-AVGREFL); |
251 |
|
|
|
252 |
greg |
2.94 |
/* PMAP: Factor in specular-diffuse ambient (caustics) from photon |
253 |
|
|
* map, if enabled and ray is primary, else caustic is zero. Continue |
254 |
|
|
* with RADIANCE ambient calculation */ |
255 |
|
|
copycolor(caustic, aval); |
256 |
|
|
ambPmapCaustic(caustic, r, rdepth); |
257 |
|
|
|
258 |
greg |
2.71 |
if (ambdiv <= 0) /* no ambient calculation */ |
259 |
|
|
goto dumbamb; |
260 |
|
|
/* check number of bounces */ |
261 |
|
|
if (rdepth >= ambounce) |
262 |
|
|
goto dumbamb; |
263 |
|
|
/* check ambient list */ |
264 |
|
|
if (ambincl != -1 && r->ro != NULL && |
265 |
|
|
ambincl != inset(ambset, r->ro->omod)) |
266 |
|
|
goto dumbamb; |
267 |
|
|
|
268 |
|
|
if (ambacc <= FTINY) { /* no ambient storage */ |
269 |
greg |
2.103 |
FVECT uvd[2]; |
270 |
|
|
float dgrad[2], *dgp = NULL; |
271 |
|
|
|
272 |
|
|
if (nrm != r->ron && DOT(nrm,r->ron) < 0.9999) |
273 |
|
|
dgp = dgrad; /* compute rotational grad. */ |
274 |
greg |
2.71 |
copycolor(acol, aval); |
275 |
|
|
rdepth++; |
276 |
greg |
2.86 |
ok = doambient(acol, r, r->rweight, |
277 |
greg |
2.103 |
uvd, NULL, NULL, dgp, NULL); |
278 |
greg |
2.71 |
rdepth--; |
279 |
|
|
if (!ok) |
280 |
|
|
goto dumbamb; |
281 |
greg |
2.103 |
if ((ok > 0) & (dgp != NULL)) { /* apply texture */ |
282 |
|
|
FVECT v1; |
283 |
|
|
VCROSS(v1, r->ron, nrm); |
284 |
|
|
d = 1.0; |
285 |
|
|
for (i = 3; i--; ) |
286 |
|
|
d += v1[i] * (dgp[0]*uvd[0][i] + dgp[1]*uvd[1][i]); |
287 |
|
|
if (d >= 0.05) |
288 |
|
|
scalecolor(acol, d); |
289 |
|
|
} |
290 |
greg |
2.71 |
copycolor(aval, acol); |
291 |
greg |
2.94 |
|
292 |
|
|
/* PMAP: add in caustic */ |
293 |
|
|
addcolor(aval, caustic); |
294 |
greg |
2.71 |
return; |
295 |
|
|
} |
296 |
|
|
/* interpolate ambient value */ |
297 |
|
|
setcolor(acol, 0.0, 0.0, 0.0); |
298 |
|
|
d = sumambient(acol, r, nrm, rdepth, |
299 |
|
|
&atrunk, thescene.cuorg, thescene.cusize); |
300 |
greg |
2.94 |
|
301 |
greg |
2.71 |
if (d > FTINY) { |
302 |
|
|
d = 1.0/d; |
303 |
|
|
scalecolor(acol, d); |
304 |
|
|
multcolor(aval, acol); |
305 |
greg |
2.94 |
|
306 |
|
|
/* PMAP: add in caustic */ |
307 |
|
|
addcolor(aval, caustic); |
308 |
greg |
2.71 |
return; |
309 |
|
|
} |
310 |
greg |
2.94 |
|
311 |
greg |
2.71 |
rdepth++; /* need to cache new value */ |
312 |
|
|
ok = makeambient(acol, r, nrm, rdepth-1); |
313 |
|
|
rdepth--; |
314 |
greg |
2.94 |
|
315 |
greg |
2.71 |
if (ok) { |
316 |
greg |
2.73 |
multcolor(aval, acol); /* computed new value */ |
317 |
greg |
2.94 |
|
318 |
|
|
/* PMAP: add in caustic */ |
319 |
|
|
addcolor(aval, caustic); |
320 |
greg |
2.71 |
return; |
321 |
|
|
} |
322 |
greg |
2.94 |
|
323 |
greg |
2.71 |
dumbamb: /* return global value */ |
324 |
|
|
if ((ambvwt <= 0) | (navsum == 0)) { |
325 |
|
|
multcolor(aval, ambval); |
326 |
greg |
2.94 |
|
327 |
|
|
/* PMAP: add in caustic */ |
328 |
|
|
addcolor(aval, caustic); |
329 |
greg |
2.71 |
return; |
330 |
|
|
} |
331 |
greg |
2.94 |
|
332 |
|
|
l = bright(ambval); /* average in computations */ |
333 |
greg |
2.71 |
if (l > FTINY) { |
334 |
greg |
2.111 |
d = (log(l)*(double)ambvwt + avsum + logAvgAbsorp*navsum) / |
335 |
greg |
2.71 |
(double)(ambvwt + navsum); |
336 |
|
|
d = exp(d) / l; |
337 |
|
|
scalecolor(aval, d); |
338 |
|
|
multcolor(aval, ambval); /* apply color of ambval */ |
339 |
|
|
} else { |
340 |
greg |
2.111 |
d = exp( avsum/(double)navsum + logAvgAbsorp ); |
341 |
greg |
2.71 |
scalecolor(aval, d); /* neutral color */ |
342 |
|
|
} |
343 |
|
|
} |
344 |
|
|
|
345 |
|
|
|
346 |
greg |
2.86 |
/* Plug a potential leak where ambient cache value is occluded */ |
347 |
|
|
static int |
348 |
|
|
plugaleak(RAY *r, AMBVAL *ap, FVECT anorm, double ang) |
349 |
|
|
{ |
350 |
|
|
const double cost70sq = 0.1169778; /* cos(70deg)^2 */ |
351 |
|
|
RAY rtst; |
352 |
|
|
FVECT vdif; |
353 |
|
|
double normdot, ndotd, nadotd; |
354 |
|
|
double a, b, c, t[2]; |
355 |
|
|
|
356 |
|
|
ang += 2.*PI*(ang < 0); /* check direction flags */ |
357 |
|
|
if ( !(ap->corral>>(int)(ang*(16./PI)) & 1) ) |
358 |
|
|
return(0); |
359 |
|
|
/* |
360 |
|
|
* Generate test ray, targeting 20 degrees above sample point plane |
361 |
|
|
* along surface normal from cache position. This should be high |
362 |
|
|
* enough to miss local geometry we don't really care about. |
363 |
|
|
*/ |
364 |
|
|
VSUB(vdif, ap->pos, r->rop); |
365 |
|
|
normdot = DOT(anorm, r->ron); |
366 |
|
|
ndotd = DOT(vdif, r->ron); |
367 |
|
|
nadotd = DOT(vdif, anorm); |
368 |
|
|
a = normdot*normdot - cost70sq; |
369 |
|
|
b = 2.0*(normdot*ndotd - nadotd*cost70sq); |
370 |
|
|
c = ndotd*ndotd - DOT(vdif,vdif)*cost70sq; |
371 |
|
|
if (quadratic(t, a, b, c) != 2) |
372 |
|
|
return(1); /* should rarely happen */ |
373 |
|
|
if (t[1] <= FTINY) |
374 |
|
|
return(0); /* should fail behind test */ |
375 |
|
|
rayorigin(&rtst, SHADOW, r, NULL); |
376 |
|
|
VSUM(rtst.rdir, vdif, anorm, t[1]); /* further dist. > plane */ |
377 |
|
|
rtst.rmax = normalize(rtst.rdir); /* short ray test */ |
378 |
|
|
while (localhit(&rtst, &thescene)) { /* check for occluder */ |
379 |
greg |
2.105 |
OBJREC *m = findmaterial(rtst.ro); |
380 |
|
|
if (m != NULL && !istransp(m->otype) && !isBSDFproxy(m) && |
381 |
greg |
2.86 |
(rtst.clipset == NULL || |
382 |
|
|
!inset(rtst.clipset, rtst.ro->omod))) |
383 |
|
|
return(1); /* plug light leak */ |
384 |
|
|
VCOPY(rtst.rorg, rtst.rop); /* skip invisible surface */ |
385 |
|
|
rtst.rmax -= rtst.rot; |
386 |
|
|
rayclear(&rtst); |
387 |
|
|
} |
388 |
|
|
return(0); /* seems we're OK */ |
389 |
|
|
} |
390 |
|
|
|
391 |
|
|
|
392 |
|
|
static double |
393 |
greg |
2.72 |
sumambient( /* get interpolated ambient value */ |
394 |
greg |
2.71 |
COLOR acol, |
395 |
|
|
RAY *r, |
396 |
|
|
FVECT rn, |
397 |
|
|
int al, |
398 |
|
|
AMBTREE *at, |
399 |
|
|
FVECT c0, |
400 |
|
|
double s |
401 |
|
|
) |
402 |
greg |
2.80 |
{ /* initial limit is 10 degrees plus ambacc radians */ |
403 |
|
|
const double minangle = 10.0 * PI/180.; |
404 |
greg |
2.84 |
double maxangle = minangle + ambacc; |
405 |
greg |
2.71 |
double wsum = 0.0; |
406 |
|
|
FVECT ck0; |
407 |
|
|
int i, j; |
408 |
|
|
AMBVAL *av; |
409 |
greg |
2.83 |
|
410 |
|
|
if (at->kid != NULL) { /* sum children first */ |
411 |
|
|
s *= 0.5; |
412 |
|
|
for (i = 0; i < 8; i++) { |
413 |
|
|
for (j = 0; j < 3; j++) { |
414 |
|
|
ck0[j] = c0[j]; |
415 |
|
|
if (1<<j & i) |
416 |
|
|
ck0[j] += s; |
417 |
|
|
if (r->rop[j] < ck0[j] - OCTSCALE*s) |
418 |
|
|
break; |
419 |
|
|
if (r->rop[j] > ck0[j] + (1.0+OCTSCALE)*s) |
420 |
|
|
break; |
421 |
|
|
} |
422 |
|
|
if (j == 3) |
423 |
|
|
wsum += sumambient(acol, r, rn, al, |
424 |
|
|
at->kid+i, ck0, s); |
425 |
|
|
} |
426 |
|
|
/* good enough? */ |
427 |
greg |
2.84 |
if (wsum >= 0.05 && s > minarad*10.0) |
428 |
greg |
2.83 |
return(wsum); |
429 |
|
|
} |
430 |
greg |
2.84 |
/* adjust maximum angle */ |
431 |
|
|
if (at->alist != NULL && (at->alist->lvl <= al) & (r->rweight < 0.6)) |
432 |
|
|
maxangle = (maxangle - PI/2.)*pow(r->rweight,0.13) + PI/2.; |
433 |
greg |
2.71 |
/* sum this node */ |
434 |
|
|
for (av = at->alist; av != NULL; av = av->next) { |
435 |
greg |
2.86 |
double u, v, d, delta_r2, delta_t2; |
436 |
greg |
2.71 |
COLOR ct; |
437 |
|
|
FVECT uvw[3]; |
438 |
|
|
/* |
439 |
greg |
2.72 |
* Ambient level test |
440 |
greg |
2.71 |
*/ |
441 |
greg |
2.87 |
if (av->lvl > al || /* list sorted, so this works */ |
442 |
|
|
(av->lvl == al) & (av->weight < 0.9*r->rweight)) |
443 |
greg |
2.71 |
break; |
444 |
|
|
/* |
445 |
greg |
2.72 |
* Direction test using unperturbed normal |
446 |
greg |
2.71 |
*/ |
447 |
|
|
decodedir(uvw[2], av->ndir); |
448 |
|
|
d = DOT(uvw[2], r->ron); |
449 |
|
|
if (d <= 0.0) /* >= 90 degrees */ |
450 |
|
|
continue; |
451 |
|
|
delta_r2 = 2.0 - 2.0*d; /* approx. radians^2 */ |
452 |
|
|
if (delta_r2 >= maxangle*maxangle) |
453 |
|
|
continue; |
454 |
|
|
/* |
455 |
greg |
2.81 |
* Modified ray behind test |
456 |
|
|
*/ |
457 |
greg |
2.85 |
VSUB(ck0, r->rop, av->pos); |
458 |
greg |
2.81 |
d = DOT(ck0, uvw[2]); |
459 |
greg |
2.84 |
if (d < -minarad*ambacc-.001) |
460 |
greg |
2.81 |
continue; |
461 |
|
|
d /= av->rad[0]; |
462 |
|
|
delta_t2 = d*d; |
463 |
greg |
2.84 |
if (delta_t2 >= ambacc*ambacc) |
464 |
greg |
2.81 |
continue; |
465 |
|
|
/* |
466 |
greg |
2.72 |
* Elliptical radii test based on Hessian |
467 |
greg |
2.71 |
*/ |
468 |
|
|
decodedir(uvw[0], av->udir); |
469 |
|
|
VCROSS(uvw[1], uvw[2], uvw[0]); |
470 |
greg |
2.86 |
d = (u = DOT(ck0, uvw[0])) / av->rad[0]; |
471 |
greg |
2.81 |
delta_t2 += d*d; |
472 |
greg |
2.86 |
d = (v = DOT(ck0, uvw[1])) / av->rad[1]; |
473 |
greg |
2.71 |
delta_t2 += d*d; |
474 |
greg |
2.84 |
if (delta_t2 >= ambacc*ambacc) |
475 |
greg |
2.71 |
continue; |
476 |
|
|
/* |
477 |
greg |
2.86 |
* Test for potential light leak |
478 |
|
|
*/ |
479 |
|
|
if (av->corral && plugaleak(r, av, uvw[2], atan2a(v,u))) |
480 |
|
|
continue; |
481 |
|
|
/* |
482 |
greg |
2.72 |
* Extrapolate value and compute final weight (hat function) |
483 |
greg |
2.71 |
*/ |
484 |
greg |
2.92 |
if (!extambient(ct, av, r->rop, rn, uvw)) |
485 |
|
|
continue; |
486 |
greg |
2.71 |
d = tfunc(maxangle, sqrt(delta_r2), 0.0) * |
487 |
greg |
2.84 |
tfunc(ambacc, sqrt(delta_t2), 0.0); |
488 |
greg |
2.71 |
scalecolor(ct, d); |
489 |
|
|
addcolor(acol, ct); |
490 |
greg |
2.72 |
wsum += d; |
491 |
greg |
2.71 |
} |
492 |
|
|
return(wsum); |
493 |
|
|
} |
494 |
|
|
|
495 |
|
|
|
496 |
greg |
2.86 |
static int |
497 |
greg |
2.71 |
makeambient( /* make a new ambient value for storage */ |
498 |
|
|
COLOR acol, |
499 |
|
|
RAY *r, |
500 |
|
|
FVECT rn, |
501 |
|
|
int al |
502 |
|
|
) |
503 |
|
|
{ |
504 |
|
|
AMBVAL amb; |
505 |
greg |
2.72 |
FVECT uvw[3]; |
506 |
greg |
2.71 |
int i; |
507 |
|
|
|
508 |
|
|
amb.weight = 1.0; /* compute weight */ |
509 |
|
|
for (i = al; i-- > 0; ) |
510 |
|
|
amb.weight *= AVGREFL; |
511 |
|
|
if (r->rweight < 0.1*amb.weight) /* heuristic override */ |
512 |
|
|
amb.weight = 1.25*r->rweight; |
513 |
|
|
setcolor(acol, AVGREFL, AVGREFL, AVGREFL); |
514 |
|
|
/* compute ambient */ |
515 |
greg |
2.86 |
i = doambient(acol, r, amb.weight, |
516 |
|
|
uvw, amb.rad, amb.gpos, amb.gdir, &amb.corral); |
517 |
greg |
2.71 |
scalecolor(acol, 1./AVGREFL); /* undo assumed reflectance */ |
518 |
greg |
2.76 |
if (i <= 0 || amb.rad[0] <= FTINY) /* no Hessian or zero radius */ |
519 |
greg |
2.73 |
return(i); |
520 |
greg |
2.71 |
/* store value */ |
521 |
|
|
VCOPY(amb.pos, r->rop); |
522 |
|
|
amb.ndir = encodedir(r->ron); |
523 |
greg |
2.72 |
amb.udir = encodedir(uvw[0]); |
524 |
greg |
2.71 |
amb.lvl = al; |
525 |
|
|
copycolor(amb.val, acol); |
526 |
|
|
/* insert into tree */ |
527 |
|
|
avsave(&amb); /* and save to file */ |
528 |
greg |
2.72 |
if (rn != r->ron) { /* texture */ |
529 |
|
|
VCOPY(uvw[2], r->ron); |
530 |
|
|
extambient(acol, &amb, r->rop, rn, uvw); |
531 |
|
|
} |
532 |
greg |
2.71 |
return(1); |
533 |
|
|
} |
534 |
|
|
|
535 |
|
|
|
536 |
greg |
2.92 |
static int |
537 |
greg |
2.71 |
extambient( /* extrapolate value at pv, nv */ |
538 |
|
|
COLOR cr, |
539 |
|
|
AMBVAL *ap, |
540 |
|
|
FVECT pv, |
541 |
greg |
2.72 |
FVECT nv, |
542 |
|
|
FVECT uvw[3] |
543 |
greg |
2.71 |
) |
544 |
|
|
{ |
545 |
greg |
2.93 |
const double min_d = 0.05; |
546 |
greg |
2.110 |
const double max_d = 20.; |
547 |
greg |
2.72 |
static FVECT my_uvw[3]; |
548 |
|
|
FVECT v1; |
549 |
|
|
int i; |
550 |
|
|
double d = 1.0; /* zeroeth order */ |
551 |
|
|
|
552 |
|
|
if (uvw == NULL) { /* need local coordinates? */ |
553 |
|
|
decodedir(my_uvw[2], ap->ndir); |
554 |
|
|
decodedir(my_uvw[0], ap->udir); |
555 |
|
|
VCROSS(my_uvw[1], my_uvw[2], my_uvw[0]); |
556 |
|
|
uvw = my_uvw; |
557 |
|
|
} |
558 |
greg |
2.71 |
for (i = 3; i--; ) /* gradient due to translation */ |
559 |
|
|
d += (pv[i] - ap->pos[i]) * |
560 |
|
|
(ap->gpos[0]*uvw[0][i] + ap->gpos[1]*uvw[1][i]); |
561 |
|
|
|
562 |
|
|
VCROSS(v1, uvw[2], nv); /* gradient due to rotation */ |
563 |
|
|
for (i = 3; i--; ) |
564 |
|
|
d += v1[i] * (ap->gdir[0]*uvw[0][i] + ap->gdir[1]*uvw[1][i]); |
565 |
|
|
|
566 |
greg |
2.110 |
if (d < min_d) /* clamp min/max scaling */ |
567 |
greg |
2.93 |
d = min_d; |
568 |
greg |
2.110 |
else if (d > max_d) |
569 |
|
|
d = max_d; |
570 |
greg |
2.71 |
copycolor(cr, ap->val); |
571 |
|
|
scalecolor(cr, d); |
572 |
greg |
2.93 |
return(d > min_d); |
573 |
greg |
2.71 |
} |
574 |
|
|
|
575 |
|
|
|
576 |
|
|
static void |
577 |
|
|
avinsert( /* insert ambient value in our tree */ |
578 |
|
|
AMBVAL *av |
579 |
|
|
) |
580 |
|
|
{ |
581 |
|
|
AMBTREE *at; |
582 |
|
|
AMBVAL *ap; |
583 |
|
|
AMBVAL avh; |
584 |
|
|
FVECT ck0; |
585 |
|
|
double s; |
586 |
|
|
int branch; |
587 |
|
|
int i; |
588 |
|
|
|
589 |
|
|
if (av->rad[0] <= FTINY) |
590 |
|
|
error(CONSISTENCY, "zero ambient radius in avinsert"); |
591 |
|
|
at = &atrunk; |
592 |
|
|
VCOPY(ck0, thescene.cuorg); |
593 |
|
|
s = thescene.cusize; |
594 |
greg |
2.84 |
while (s*(OCTSCALE/2) > av->rad[1]*ambacc) { |
595 |
greg |
2.71 |
if (at->kid == NULL) |
596 |
|
|
if ((at->kid = newambtree()) == NULL) |
597 |
|
|
error(SYSTEM, "out of memory in avinsert"); |
598 |
|
|
s *= 0.5; |
599 |
|
|
branch = 0; |
600 |
|
|
for (i = 0; i < 3; i++) |
601 |
|
|
if (av->pos[i] > ck0[i] + s) { |
602 |
|
|
ck0[i] += s; |
603 |
|
|
branch |= 1 << i; |
604 |
|
|
} |
605 |
|
|
at = at->kid + branch; |
606 |
|
|
} |
607 |
|
|
avh.next = at->alist; /* order by increasing level */ |
608 |
|
|
for (ap = &avh; ap->next != NULL; ap = ap->next) |
609 |
greg |
2.87 |
if ( ap->next->lvl > av->lvl || |
610 |
|
|
(ap->next->lvl == av->lvl) & |
611 |
|
|
(ap->next->weight <= av->weight) ) |
612 |
greg |
2.71 |
break; |
613 |
|
|
av->next = ap->next; |
614 |
|
|
ap->next = (AMBVAL*)av; |
615 |
|
|
at->alist = avh.next; |
616 |
|
|
} |
617 |
|
|
|
618 |
|
|
|
619 |
|
|
static void |
620 |
schorsch |
2.56 |
initambfile( /* initialize ambient file */ |
621 |
greg |
2.68 |
int cre8 |
622 |
schorsch |
2.56 |
) |
623 |
greg |
2.9 |
{ |
624 |
greg |
2.47 |
extern char *progname, *octname; |
625 |
|
|
static char *mybuf = NULL; |
626 |
greg |
2.9 |
|
627 |
greg |
2.19 |
#ifdef F_SETLKW |
628 |
greg |
2.69 |
aflock(cre8 ? F_WRLCK : F_RDLCK); |
629 |
greg |
2.19 |
#endif |
630 |
schorsch |
2.50 |
SET_FILE_BINARY(ambfp); |
631 |
greg |
2.47 |
if (mybuf == NULL) |
632 |
|
|
mybuf = (char *)bmalloc(BUFSIZ+8); |
633 |
|
|
setbuf(ambfp, mybuf); |
634 |
greg |
2.68 |
if (cre8) { /* new file */ |
635 |
greg |
2.24 |
newheader("RADIANCE", ambfp); |
636 |
greg |
2.41 |
fprintf(ambfp, "%s -av %g %g %g -aw %d -ab %d -aa %g ", |
637 |
greg |
2.9 |
progname, colval(ambval,RED), |
638 |
|
|
colval(ambval,GRN), colval(ambval,BLU), |
639 |
greg |
2.41 |
ambvwt, ambounce, ambacc); |
640 |
greg |
2.47 |
fprintf(ambfp, "-ad %d -as %d -ar %d ", |
641 |
|
|
ambdiv, ambssamp, ambres); |
642 |
greg |
2.115 |
fprintf(ambfp, "-dr %d -ds %g -dt %g -dc %g ", directrelay, |
643 |
|
|
srcsizerat, shadthresh, shadcert); |
644 |
|
|
fprintf(ambfp, "-ss %g -st %g -lr %d -lw %g ", specjitter, |
645 |
|
|
specthresh, maxdepth, minweight); |
646 |
greg |
2.47 |
if (octname != NULL) |
647 |
greg |
2.68 |
fputs(octname, ambfp); |
648 |
|
|
fputc('\n', ambfp); |
649 |
greg |
2.9 |
fprintf(ambfp, "SOFTWARE= %s\n", VersionID); |
650 |
greg |
2.47 |
fputnow(ambfp); |
651 |
greg |
2.9 |
fputformat(AMBFMT, ambfp); |
652 |
greg |
2.68 |
fputc('\n', ambfp); |
653 |
greg |
2.9 |
putambmagic(ambfp); |
654 |
greg |
2.17 |
} else if (checkheader(ambfp, AMBFMT, NULL) < 0 || !hasambmagic(ambfp)) |
655 |
|
|
error(USER, "bad ambient file"); |
656 |
greg |
2.9 |
} |
657 |
|
|
|
658 |
|
|
|
659 |
greg |
2.47 |
static void |
660 |
schorsch |
2.56 |
avsave( /* insert and save an ambient value */ |
661 |
|
|
AMBVAL *av |
662 |
|
|
) |
663 |
greg |
1.1 |
{ |
664 |
greg |
2.88 |
avstore(av); |
665 |
greg |
1.1 |
if (ambfp == NULL) |
666 |
|
|
return; |
667 |
greg |
2.5 |
if (writambval(av, ambfp) < 0) |
668 |
greg |
1.1 |
goto writerr; |
669 |
greg |
2.16 |
if (++nunflshed >= AMBFLUSH) |
670 |
greg |
2.7 |
if (ambsync() == EOF) |
671 |
greg |
1.1 |
goto writerr; |
672 |
|
|
return; |
673 |
|
|
writerr: |
674 |
greg |
2.47 |
error(SYSTEM, "error writing to ambient file"); |
675 |
greg |
1.1 |
} |
676 |
|
|
|
677 |
|
|
|
678 |
greg |
2.20 |
static AMBVAL * |
679 |
greg |
2.88 |
avstore( /* allocate memory and save aval */ |
680 |
greg |
2.70 |
AMBVAL *aval |
681 |
schorsch |
2.56 |
) |
682 |
greg |
2.20 |
{ |
683 |
greg |
2.70 |
AMBVAL *av; |
684 |
gregl |
2.43 |
double d; |
685 |
greg |
2.20 |
|
686 |
|
|
if ((av = newambval()) == NULL) |
687 |
|
|
error(SYSTEM, "out of memory in avstore"); |
688 |
schorsch |
2.53 |
*av = *aval; |
689 |
greg |
2.26 |
av->next = NULL; |
690 |
|
|
nambvals++; |
691 |
gregl |
2.43 |
d = bright(av->val); |
692 |
|
|
if (d > FTINY) { /* add to log sum for averaging */ |
693 |
|
|
avsum += log(d); |
694 |
|
|
navsum++; |
695 |
|
|
} |
696 |
greg |
2.88 |
avinsert(av); /* insert in our cache tree */ |
697 |
greg |
2.20 |
return(av); |
698 |
|
|
} |
699 |
|
|
|
700 |
|
|
|
701 |
greg |
2.26 |
#define ATALLOCSZ 512 /* #/8 trees to allocate at once */ |
702 |
|
|
|
703 |
|
|
static AMBTREE *atfreelist = NULL; /* free ambient tree structures */ |
704 |
|
|
|
705 |
|
|
|
706 |
greg |
2.47 |
static AMBTREE * |
707 |
schorsch |
2.56 |
newambtree(void) /* allocate 8 ambient tree structs */ |
708 |
greg |
2.26 |
{ |
709 |
greg |
2.70 |
AMBTREE *atp, *upperlim; |
710 |
greg |
2.26 |
|
711 |
|
|
if (atfreelist == NULL) { /* get more nodes */ |
712 |
greg |
2.47 |
atfreelist = (AMBTREE *)malloc(ATALLOCSZ*8*sizeof(AMBTREE)); |
713 |
greg |
2.26 |
if (atfreelist == NULL) |
714 |
|
|
return(NULL); |
715 |
|
|
/* link new free list */ |
716 |
|
|
upperlim = atfreelist + 8*(ATALLOCSZ-1); |
717 |
|
|
for (atp = atfreelist; atp < upperlim; atp += 8) |
718 |
|
|
atp->kid = atp + 8; |
719 |
|
|
atp->kid = NULL; |
720 |
|
|
} |
721 |
|
|
atp = atfreelist; |
722 |
|
|
atfreelist = atp->kid; |
723 |
greg |
2.102 |
memset(atp, 0, 8*sizeof(AMBTREE)); |
724 |
greg |
2.26 |
return(atp); |
725 |
|
|
} |
726 |
|
|
|
727 |
|
|
|
728 |
greg |
2.47 |
static void |
729 |
schorsch |
2.56 |
freeambtree( /* free 8 ambient tree structs */ |
730 |
|
|
AMBTREE *atp |
731 |
|
|
) |
732 |
greg |
2.26 |
{ |
733 |
greg |
2.100 |
atp->kid = atfreelist; |
734 |
greg |
2.26 |
atfreelist = atp; |
735 |
|
|
} |
736 |
|
|
|
737 |
|
|
|
738 |
greg |
2.47 |
static void |
739 |
schorsch |
2.56 |
unloadatree( /* unload an ambient value tree */ |
740 |
greg |
2.70 |
AMBTREE *at, |
741 |
schorsch |
2.56 |
unloadtf_t *f |
742 |
|
|
) |
743 |
greg |
2.20 |
{ |
744 |
greg |
2.70 |
AMBVAL *av; |
745 |
|
|
int i; |
746 |
greg |
2.20 |
/* transfer values at this node */ |
747 |
|
|
for (av = at->alist; av != NULL; av = at->alist) { |
748 |
|
|
at->alist = av->next; |
749 |
greg |
2.102 |
av->next = NULL; |
750 |
greg |
2.26 |
(*f)(av); |
751 |
greg |
2.20 |
} |
752 |
greg |
2.21 |
if (at->kid == NULL) |
753 |
|
|
return; |
754 |
greg |
2.20 |
for (i = 0; i < 8; i++) /* transfer and free children */ |
755 |
greg |
2.26 |
unloadatree(at->kid+i, f); |
756 |
greg |
2.20 |
freeambtree(at->kid); |
757 |
greg |
2.26 |
at->kid = NULL; |
758 |
|
|
} |
759 |
|
|
|
760 |
|
|
|
761 |
schorsch |
2.56 |
static void |
762 |
greg |
2.71 |
avfree(AMBVAL *av) |
763 |
|
|
{ |
764 |
|
|
free(av); |
765 |
|
|
} |
766 |
|
|
|
767 |
greg |
2.112 |
|
768 |
greg |
2.71 |
static void |
769 |
greg |
2.112 |
sortambvals(void) /* resort ambient values */ |
770 |
greg |
2.27 |
{ |
771 |
greg |
2.112 |
AMBTREE oldatrunk = atrunk; |
772 |
greg |
2.27 |
|
773 |
greg |
2.112 |
atrunk.alist = NULL; |
774 |
|
|
atrunk.kid = NULL; |
775 |
|
|
unloadatree(&oldatrunk, avinsert); |
776 |
greg |
2.20 |
} |
777 |
|
|
|
778 |
|
|
|
779 |
greg |
2.18 |
#ifdef F_SETLKW |
780 |
greg |
2.10 |
|
781 |
greg |
2.47 |
static void |
782 |
schorsch |
2.56 |
aflock( /* lock/unlock ambient file */ |
783 |
|
|
int typ |
784 |
|
|
) |
785 |
greg |
2.19 |
{ |
786 |
|
|
static struct flock fls; /* static so initialized to zeroes */ |
787 |
|
|
|
788 |
greg |
2.66 |
if (typ == fls.l_type) /* already called? */ |
789 |
|
|
return; |
790 |
greg |
2.109 |
|
791 |
greg |
2.19 |
fls.l_type = typ; |
792 |
greg |
2.109 |
do |
793 |
|
|
if (fcntl(fileno(ambfp), F_SETLKW, &fls) != -1) |
794 |
|
|
return; |
795 |
|
|
while (errno == EINTR); |
796 |
|
|
|
797 |
|
|
error(SYSTEM, "cannot (un)lock ambient file"); |
798 |
greg |
2.19 |
} |
799 |
|
|
|
800 |
|
|
|
801 |
greg |
2.71 |
int |
802 |
schorsch |
2.56 |
ambsync(void) /* synchronize ambient file */ |
803 |
greg |
2.7 |
{ |
804 |
greg |
2.15 |
long flen; |
805 |
greg |
2.12 |
AMBVAL avs; |
806 |
greg |
2.70 |
int n; |
807 |
greg |
2.16 |
|
808 |
greg |
2.65 |
if (ambfp == NULL) /* no ambient file? */ |
809 |
|
|
return(0); |
810 |
greg |
2.63 |
/* gain appropriate access */ |
811 |
|
|
aflock(nunflshed ? F_WRLCK : F_RDLCK); |
812 |
greg |
2.7 |
/* see if file has grown */ |
813 |
greg |
2.55 |
if ((flen = lseek(fileno(ambfp), (off_t)0, SEEK_END)) < 0) |
814 |
greg |
2.21 |
goto seekerr; |
815 |
greg |
2.68 |
if ((n = flen - lastpos) > 0) { /* file has grown */ |
816 |
greg |
2.104 |
if (ambinp == NULL) { /* get new file pointer */ |
817 |
|
|
ambinp = fopen(ambfile, "rb"); |
818 |
greg |
2.14 |
if (ambinp == NULL) |
819 |
greg |
2.104 |
error(SYSTEM, "fopen failed in ambsync"); |
820 |
greg |
2.14 |
} |
821 |
greg |
2.66 |
if (fseek(ambinp, lastpos, SEEK_SET) < 0) |
822 |
greg |
2.21 |
goto seekerr; |
823 |
greg |
2.15 |
while (n >= AMBVALSIZ) { /* load contributed values */ |
824 |
greg |
2.37 |
if (!readambval(&avs, ambinp)) { |
825 |
|
|
sprintf(errmsg, |
826 |
greg |
2.47 |
"ambient file \"%s\" corrupted near character %ld", |
827 |
|
|
ambfile, flen - n); |
828 |
greg |
2.37 |
error(WARNING, errmsg); |
829 |
|
|
break; |
830 |
|
|
} |
831 |
greg |
2.88 |
avstore(&avs); |
832 |
greg |
2.15 |
n -= AMBVALSIZ; |
833 |
|
|
} |
834 |
greg |
2.104 |
lastpos = flen - n; /* check alignment */ |
835 |
|
|
if (n && lseek(fileno(ambfp), (off_t)lastpos, SEEK_SET) < 0) |
836 |
|
|
goto seekerr; |
837 |
greg |
2.7 |
} |
838 |
|
|
n = fflush(ambfp); /* calls write() at last */ |
839 |
greg |
2.104 |
lastpos += (long)nunflshed*AMBVALSIZ; |
840 |
greg |
2.19 |
aflock(F_UNLCK); /* release file */ |
841 |
greg |
2.16 |
nunflshed = 0; |
842 |
greg |
2.7 |
return(n); |
843 |
greg |
2.21 |
seekerr: |
844 |
|
|
error(SYSTEM, "seek failed in ambsync"); |
845 |
greg |
2.104 |
return(EOF); /* pro forma return */ |
846 |
greg |
2.18 |
} |
847 |
|
|
|
848 |
greg |
2.71 |
#else /* ! F_SETLKW */ |
849 |
greg |
2.18 |
|
850 |
greg |
2.71 |
int |
851 |
schorsch |
2.56 |
ambsync(void) /* flush ambient file */ |
852 |
greg |
2.18 |
{ |
853 |
greg |
2.65 |
if (ambfp == NULL) |
854 |
|
|
return(0); |
855 |
greg |
2.18 |
nunflshed = 0; |
856 |
|
|
return(fflush(ambfp)); |
857 |
greg |
1.1 |
} |
858 |
greg |
2.10 |
|
859 |
greg |
2.71 |
#endif /* ! F_SETLKW */ |