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/* Copyright (c) 1991 Regents of the University of California */ |
2 |
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|
1 |
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#ifndef lint |
2 |
< |
static char SCCSid[] = "$SunId$ LBL"; |
2 |
> |
static const char RCSid[] = "$Id$"; |
3 |
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#endif |
6 |
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|
4 |
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/* |
5 |
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* ambient.c - routines dealing with ambient (inter-reflected) component. |
6 |
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* |
7 |
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* The macro AMBFLUSH (if defined) is the number of ambient values |
11 |
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* to wait before flushing to the ambient file. |
12 |
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* |
13 |
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* 5/9/86 |
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* Declarations of external symbols in ambient.h |
8 |
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*/ |
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|
10 |
< |
#include "ray.h" |
10 |
> |
#include "copyright.h" |
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|
12 |
< |
#include "octree.h" |
12 |
> |
#include <string.h> |
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|
14 |
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#include "platform.h" |
15 |
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#include "ray.h" |
16 |
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#include "otypes.h" |
21 |
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|
17 |
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#include "ambient.h" |
23 |
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|
18 |
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#include "random.h" |
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|
20 |
< |
#define OCTSCALE 0.5 /* ceil((valid rad.)/(cube size)) */ |
20 |
> |
#ifndef OCTSCALE |
21 |
> |
#define OCTSCALE 1.0 /* ceil((valid rad.)/(cube size)) */ |
22 |
> |
#endif |
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|
|
24 |
< |
typedef struct ambtree { |
29 |
< |
AMBVAL *alist; /* ambient value list */ |
30 |
< |
struct ambtree *kid; /* 8 child nodes */ |
31 |
< |
} AMBTREE; /* ambient octree */ |
24 |
> |
extern char *shm_boundary; /* memory sharing boundary */ |
25 |
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|
26 |
< |
extern CUBE thescene; /* contains space boundaries */ |
26 |
> |
#define MAXASET 511 /* maximum number of elements in ambient set */ |
27 |
> |
OBJECT ambset[MAXASET+1]={0}; /* ambient include/exclude set */ |
28 |
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|
29 |
< |
#define MAXASET 511 /* maximum number of elements in ambient set */ |
30 |
< |
OBJECT ambset[MAXASET+1]={0}; /* ambient include/exclude set */ |
29 |
> |
double maxarad; /* maximum ambient radius */ |
30 |
> |
double minarad; /* minimum ambient radius */ |
31 |
|
|
32 |
< |
double maxarad; /* maximum ambient radius */ |
39 |
< |
double minarad; /* minimum ambient radius */ |
32 |
> |
static AMBTREE atrunk; /* our ambient trunk node */ |
33 |
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|
41 |
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static AMBTREE atrunk; /* our ambient trunk node */ |
42 |
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|
34 |
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static FILE *ambfp = NULL; /* ambient file pointer */ |
35 |
+ |
static int nunflshed = 0; /* number of unflushed ambient values */ |
36 |
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|
37 |
< |
#define newambval() (AMBVAL *)bmalloc(sizeof(AMBVAL)) |
37 |
> |
#ifndef SORT_THRESH |
38 |
> |
#ifdef SMLMEM |
39 |
> |
#define SORT_THRESH ((3L<<20)/sizeof(AMBVAL)) |
40 |
> |
#else |
41 |
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#define SORT_THRESH ((9L<<20)/sizeof(AMBVAL)) |
42 |
> |
#endif |
43 |
> |
#endif |
44 |
> |
#ifndef SORT_INTVL |
45 |
> |
#define SORT_INTVL (SORT_THRESH<<1) |
46 |
> |
#endif |
47 |
> |
#ifndef MAX_SORT_INTVL |
48 |
> |
#define MAX_SORT_INTVL (SORT_INTVL<<6) |
49 |
> |
#endif |
50 |
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|
51 |
< |
#define newambtree() (AMBTREE *)calloc(8, sizeof(AMBTREE)) |
51 |
> |
static double avsum = 0.; /* computed ambient value sum (log) */ |
52 |
> |
static unsigned int navsum = 0; /* number of values in avsum */ |
53 |
> |
static unsigned int nambvals = 0; /* total number of indirect values */ |
54 |
> |
static unsigned int nambshare = 0; /* number of values from file */ |
55 |
> |
static unsigned long ambclock = 0; /* ambient access clock */ |
56 |
> |
static unsigned long lastsort = 0; /* time of last value sort */ |
57 |
> |
static long sortintvl = SORT_INTVL; /* time until next sort */ |
58 |
> |
static FILE *ambinp = NULL; /* auxiliary file for input */ |
59 |
> |
static long lastpos = -1; /* last flush position */ |
60 |
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|
61 |
+ |
#define MAXACLOCK (1L<<30) /* clock turnover value */ |
62 |
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/* |
63 |
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* Track access times unless we are sharing ambient values |
64 |
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* through memory on a multiprocessor, when we want to avoid |
65 |
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* claiming our own memory (copy on write). Go ahead anyway |
66 |
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* if more than two thirds of our values are unshared. |
67 |
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* Compile with -Dtracktime=0 to turn this code off. |
68 |
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*/ |
69 |
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#ifndef tracktime |
70 |
+ |
#define tracktime (shm_boundary == NULL || nambvals > 3*nambshare) |
71 |
+ |
#endif |
72 |
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|
73 |
< |
setambient(afile) /* initialize calculation */ |
74 |
< |
char *afile; |
73 |
> |
#define AMBFLUSH (BUFSIZ/AMBVALSIZ) |
74 |
> |
|
75 |
> |
#define newambval() (AMBVAL *)malloc(sizeof(AMBVAL)) |
76 |
> |
#define freeav(av) free((void *)av); |
77 |
> |
|
78 |
> |
static void initambfile(), avsave(), avinsert(), sortambvals(), unloadatree(); |
79 |
> |
static int avlmemi(); |
80 |
> |
static AMBVAL *avstore(); |
81 |
> |
#ifdef F_SETLKW |
82 |
> |
static void aflock(); |
83 |
> |
#endif |
84 |
> |
|
85 |
> |
|
86 |
> |
void |
87 |
> |
setambres(ar) /* set ambient resolution */ |
88 |
> |
int ar; |
89 |
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{ |
90 |
< |
long ftell(); |
91 |
< |
AMBVAL amb; |
90 |
> |
ambres = ar < 0 ? 0 : ar; /* may be done already */ |
91 |
> |
/* set min & max radii */ |
92 |
> |
if (ar <= 0) { |
93 |
> |
minarad = 0; |
94 |
> |
maxarad = thescene.cusize / 2.0; |
95 |
> |
} else { |
96 |
> |
minarad = thescene.cusize / ar; |
97 |
> |
maxarad = 64 * minarad; /* heuristic */ |
98 |
> |
if (maxarad > thescene.cusize / 2.0) |
99 |
> |
maxarad = thescene.cusize / 2.0; |
100 |
> |
} |
101 |
> |
if (minarad <= FTINY) |
102 |
> |
minarad = 10*FTINY; |
103 |
> |
if (maxarad <= minarad) |
104 |
> |
maxarad = 64 * minarad; |
105 |
> |
} |
106 |
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|
56 |
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maxarad = thescene.cusize / 2.0; /* maximum radius */ |
57 |
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/* minimum radius */ |
58 |
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minarad = ambres > 0 ? thescene.cusize/ambres : 0.0; |
107 |
|
|
108 |
< |
/* open ambient file */ |
109 |
< |
if (afile != NULL) |
110 |
< |
if ((ambfp = fopen(afile, "r+")) != NULL) { |
111 |
< |
while (fread((char *)&amb,sizeof(AMBVAL),1,ambfp) == 1) |
112 |
< |
avinsert(&amb, &atrunk, thescene.cuorg, |
113 |
< |
thescene.cusize); |
114 |
< |
/* align */ |
115 |
< |
fseek(ambfp, -(ftell(ambfp)%sizeof(AMBVAL)), 1); |
116 |
< |
} else if ((ambfp = fopen(afile, "w")) == NULL) { |
117 |
< |
sprintf(errmsg, "cannot open ambient file \"%s\"", |
118 |
< |
afile); |
119 |
< |
error(SYSTEM, errmsg); |
108 |
> |
void |
109 |
> |
setambacc(newa) /* set ambient accuracy */ |
110 |
> |
double newa; |
111 |
> |
{ |
112 |
> |
double ambdiff; |
113 |
> |
|
114 |
> |
if (newa < 0.0) |
115 |
> |
newa = 0.0; |
116 |
> |
ambdiff = fabs(newa - ambacc); |
117 |
> |
if (ambdiff >= .01 && (ambacc = newa) > FTINY && nambvals > 0) |
118 |
> |
sortambvals(1); /* rebuild tree */ |
119 |
> |
} |
120 |
> |
|
121 |
> |
|
122 |
> |
void |
123 |
> |
setambient() /* initialize calculation */ |
124 |
> |
{ |
125 |
> |
int readonly = 0; |
126 |
> |
long pos, flen; |
127 |
> |
AMBVAL amb; |
128 |
> |
/* make sure we're fresh */ |
129 |
> |
ambdone(); |
130 |
> |
/* init ambient limits */ |
131 |
> |
setambres(ambres); |
132 |
> |
setambacc(ambacc); |
133 |
> |
if (ambfile == NULL || !ambfile[0]) |
134 |
> |
return; |
135 |
> |
if (ambacc <= FTINY) { |
136 |
> |
sprintf(errmsg, "zero ambient accuracy so \"%s\" not opened", |
137 |
> |
ambfile); |
138 |
> |
error(WARNING, errmsg); |
139 |
> |
return; |
140 |
> |
} |
141 |
> |
/* open ambient file */ |
142 |
> |
if ((ambfp = fopen(ambfile, "r+")) == NULL) |
143 |
> |
readonly = (ambfp = fopen(ambfile, "r")) != NULL; |
144 |
> |
if (ambfp != NULL) { |
145 |
> |
initambfile(0); /* file exists */ |
146 |
> |
pos = ftell(ambfp); |
147 |
> |
while (readambval(&amb, ambfp)) |
148 |
> |
avinsert(avstore(&amb)); |
149 |
> |
nambshare = nambvals; /* share loaded values */ |
150 |
> |
if (readonly) { |
151 |
> |
sprintf(errmsg, |
152 |
> |
"loaded %u values from read-only ambient file", |
153 |
> |
nambvals); |
154 |
> |
error(WARNING, errmsg); |
155 |
> |
fclose(ambfp); /* close file so no writes */ |
156 |
> |
ambfp = NULL; |
157 |
> |
return; /* avoid ambsync() */ |
158 |
|
} |
159 |
+ |
/* align file pointer */ |
160 |
+ |
pos += (long)nambvals*AMBVALSIZ; |
161 |
+ |
flen = lseek(fileno(ambfp), (off_t)0L, 2); |
162 |
+ |
if (flen != pos) { |
163 |
+ |
sprintf(errmsg, |
164 |
+ |
"ignoring last %ld values in ambient file (corrupted)", |
165 |
+ |
(flen - pos)/AMBVALSIZ); |
166 |
+ |
error(WARNING, errmsg); |
167 |
+ |
fseek(ambfp, pos, 0); |
168 |
+ |
#ifndef _WIN32 /* XXX we need a replacement for that one */ |
169 |
+ |
ftruncate(fileno(ambfp), (off_t)pos); |
170 |
+ |
#endif |
171 |
+ |
} |
172 |
+ |
} else if ((ambfp = fopen(ambfile, "w+")) != NULL) { |
173 |
+ |
initambfile(1); /* else create new file */ |
174 |
+ |
} else { |
175 |
+ |
sprintf(errmsg, "cannot open ambient file \"%s\"", ambfile); |
176 |
+ |
error(SYSTEM, errmsg); |
177 |
+ |
} |
178 |
+ |
nunflshed++; /* lie */ |
179 |
+ |
ambsync(); |
180 |
|
} |
181 |
|
|
182 |
|
|
183 |
+ |
void |
184 |
+ |
ambdone() /* close ambient file and free memory */ |
185 |
+ |
{ |
186 |
+ |
if (ambfp != NULL) { /* close ambient file */ |
187 |
+ |
ambsync(); |
188 |
+ |
fclose(ambfp); |
189 |
+ |
ambfp = NULL; |
190 |
+ |
if (ambinp != NULL) { |
191 |
+ |
fclose(ambinp); |
192 |
+ |
ambinp = NULL; |
193 |
+ |
} |
194 |
+ |
lastpos = -1; |
195 |
+ |
} |
196 |
+ |
/* free ambient tree */ |
197 |
+ |
unloadatree(&atrunk, free); |
198 |
+ |
/* reset state variables */ |
199 |
+ |
avsum = 0.; |
200 |
+ |
navsum = 0; |
201 |
+ |
nambvals = 0; |
202 |
+ |
nambshare = 0; |
203 |
+ |
ambclock = 0; |
204 |
+ |
lastsort = 0; |
205 |
+ |
sortintvl = SORT_INTVL; |
206 |
+ |
} |
207 |
+ |
|
208 |
+ |
|
209 |
+ |
void |
210 |
|
ambnotify(obj) /* record new modifier */ |
211 |
< |
OBJECT obj; |
211 |
> |
OBJECT obj; |
212 |
|
{ |
213 |
|
static int hitlimit = 0; |
214 |
< |
register OBJREC *o = objptr(obj); |
214 |
> |
register OBJREC *o; |
215 |
|
register char **amblp; |
216 |
|
|
217 |
+ |
if (obj == OVOID) { /* starting over */ |
218 |
+ |
ambset[0] = 0; |
219 |
+ |
hitlimit = 0; |
220 |
+ |
return; |
221 |
+ |
} |
222 |
+ |
o = objptr(obj); |
223 |
|
if (hitlimit || !ismodifier(o->otype)) |
224 |
|
return; |
225 |
|
for (amblp = amblist; *amblp != NULL; amblp++) |
235 |
|
} |
236 |
|
|
237 |
|
|
238 |
< |
ambient(acol, r) /* compute ambient component for ray */ |
238 |
> |
void |
239 |
> |
ambient(acol, r, nrm) /* compute ambient component for ray */ |
240 |
|
COLOR acol; |
241 |
|
register RAY *r; |
242 |
+ |
FVECT nrm; |
243 |
|
{ |
244 |
|
static int rdepth = 0; /* ambient recursion */ |
245 |
< |
double d; |
245 |
> |
double d, l; |
246 |
|
|
247 |
|
if (ambdiv <= 0) /* no ambient calculation */ |
248 |
|
goto dumbamb; |
258 |
|
rdepth++; |
259 |
|
d = doambient(acol, r, r->rweight, NULL, NULL); |
260 |
|
rdepth--; |
261 |
< |
if (d == 0.0) |
261 |
> |
if (d <= FTINY) |
262 |
|
goto dumbamb; |
263 |
|
return; |
264 |
|
} |
265 |
+ |
|
266 |
+ |
if (tracktime) /* sort to minimize thrashing */ |
267 |
+ |
sortambvals(0); |
268 |
|
/* get ambient value */ |
269 |
|
setcolor(acol, 0.0, 0.0, 0.0); |
270 |
< |
d = sumambient(acol, r, rdepth, |
270 |
> |
d = sumambient(acol, r, nrm, rdepth, |
271 |
|
&atrunk, thescene.cuorg, thescene.cusize); |
272 |
< |
if (d > FTINY) |
272 |
> |
if (d > FTINY) { |
273 |
|
scalecolor(acol, 1.0/d); |
274 |
< |
else { |
130 |
< |
d = makeambient(acol, r, rdepth++); |
131 |
< |
rdepth--; |
274 |
> |
return; |
275 |
|
} |
276 |
+ |
rdepth++; /* need to cache new value */ |
277 |
+ |
d = makeambient(acol, r, nrm, rdepth-1); |
278 |
+ |
rdepth--; |
279 |
|
if (d > FTINY) |
280 |
|
return; |
281 |
|
dumbamb: /* return global value */ |
282 |
|
copycolor(acol, ambval); |
283 |
+ |
if (ambvwt <= 0 | navsum == 0) |
284 |
+ |
return; |
285 |
+ |
l = bright(ambval); /* average in computations */ |
286 |
+ |
if (l > FTINY) { |
287 |
+ |
d = (log(l)*(double)ambvwt + avsum) / |
288 |
+ |
(double)(ambvwt + navsum); |
289 |
+ |
d = exp(d) / l; |
290 |
+ |
scalecolor(acol, d); /* apply color of ambval */ |
291 |
+ |
} else { |
292 |
+ |
d = exp( avsum / (double)navsum ); |
293 |
+ |
setcolor(acol, d, d, d); /* neutral color */ |
294 |
+ |
} |
295 |
|
} |
296 |
|
|
297 |
|
|
298 |
|
double |
299 |
< |
sumambient(acol, r, al, at, c0, s) /* get interpolated ambient value */ |
299 |
> |
sumambient(acol, r, rn, al, at, c0, s) /* get interpolated ambient value */ |
300 |
|
COLOR acol; |
301 |
|
register RAY *r; |
302 |
+ |
FVECT rn; |
303 |
|
int al; |
304 |
< |
AMBTREE *at; |
304 |
> |
AMBTREE *at; |
305 |
|
FVECT c0; |
306 |
< |
double s; |
306 |
> |
double s; |
307 |
|
{ |
308 |
< |
extern double sqrt(); |
150 |
< |
double d, e1, e2, wt, wsum; |
308 |
> |
double d, e1, e2, wt, wsum; |
309 |
|
COLOR ct; |
310 |
|
FVECT ck0; |
311 |
|
int i; |
312 |
|
register int j; |
313 |
< |
register AMBVAL *av; |
314 |
< |
/* do this node */ |
313 |
> |
register AMBVAL *av; |
314 |
> |
|
315 |
|
wsum = 0.0; |
316 |
+ |
/* do this node */ |
317 |
|
for (av = at->alist; av != NULL; av = av->next) { |
318 |
+ |
double rn_dot = -2.0; |
319 |
+ |
if (tracktime) |
320 |
+ |
av->latick = ambclock; |
321 |
|
/* |
322 |
|
* Ambient level test. |
323 |
|
*/ |
324 |
< |
if (av->lvl > al || av->weight < r->rweight-FTINY) |
324 |
> |
if (av->lvl > al) /* list sorted, so this works */ |
325 |
> |
break; |
326 |
> |
if (av->weight < r->rweight-FTINY) |
327 |
|
continue; |
328 |
|
/* |
329 |
|
* Ambient radius test. |
330 |
|
*/ |
331 |
< |
e1 = 0.0; |
332 |
< |
for (j = 0; j < 3; j++) { |
333 |
< |
d = av->pos[j] - r->rop[j]; |
334 |
< |
e1 += d * d; |
335 |
< |
} |
331 |
> |
d = av->pos[0] - r->rop[0]; |
332 |
> |
e1 = d * d; |
333 |
> |
d = av->pos[1] - r->rop[1]; |
334 |
> |
e1 += d * d; |
335 |
> |
d = av->pos[2] - r->rop[2]; |
336 |
> |
e1 += d * d; |
337 |
|
e1 /= av->rad * av->rad; |
338 |
|
if (e1 > ambacc*ambacc*1.21) |
339 |
|
continue; |
340 |
|
/* |
341 |
< |
* Normal direction test. |
341 |
> |
* Direction test using closest normal. |
342 |
|
*/ |
343 |
< |
e2 = (1.0 - DOT(av->dir, r->ron)) * r->rweight; |
343 |
> |
d = DOT(av->dir, r->ron); |
344 |
> |
if (rn != r->ron) { |
345 |
> |
rn_dot = DOT(av->dir, rn); |
346 |
> |
if (rn_dot > 1.0-FTINY) |
347 |
> |
rn_dot = 1.0-FTINY; |
348 |
> |
if (rn_dot >= d-FTINY) { |
349 |
> |
d = rn_dot; |
350 |
> |
rn_dot = -2.0; |
351 |
> |
} |
352 |
> |
} |
353 |
> |
e2 = (1.0 - d) * r->rweight; |
354 |
|
if (e2 < 0.0) e2 = 0.0; |
355 |
|
if (e1 + e2 > ambacc*ambacc*1.21) |
356 |
|
continue; |
361 |
|
for (j = 0; j < 3; j++) |
362 |
|
d += (r->rop[j] - av->pos[j]) * |
363 |
|
(av->dir[j] + r->ron[j]); |
364 |
< |
if (d*0.5 < -minarad*ambacc) |
364 |
> |
if (d*0.5 < -minarad*ambacc-.001) |
365 |
|
continue; |
366 |
|
/* |
367 |
|
* Jittering final test reduces image artifacts. |
368 |
|
*/ |
369 |
< |
wt = sqrt(e1) + sqrt(e2); |
370 |
< |
wt *= .9 + .2*frandom(); |
371 |
< |
if (wt > ambacc) |
369 |
> |
e1 = sqrt(e1); |
370 |
> |
e2 = sqrt(e2); |
371 |
> |
wt = e1 + e2; |
372 |
> |
if (wt > ambacc*(.9+.2*urand(9015+samplendx))) |
373 |
|
continue; |
374 |
+ |
/* |
375 |
+ |
* Recompute directional error using perturbed normal |
376 |
+ |
*/ |
377 |
+ |
if (rn_dot > 0.0) { |
378 |
+ |
e2 = sqrt((1.0 - rn_dot)*r->rweight); |
379 |
+ |
wt = e1 + e2; |
380 |
+ |
} |
381 |
|
if (wt <= 1e-3) |
382 |
|
wt = 1e3; |
383 |
|
else |
384 |
|
wt = 1.0 / wt; |
385 |
|
wsum += wt; |
386 |
< |
extambient(ct, av, r->rop, r->ron); |
386 |
> |
extambient(ct, av, r->rop, rn); |
387 |
|
scalecolor(ct, wt); |
388 |
|
addcolor(acol, ct); |
389 |
|
} |
402 |
|
break; |
403 |
|
} |
404 |
|
if (j == 3) |
405 |
< |
wsum += sumambient(acol, r, al, at->kid+i, ck0, s); |
405 |
> |
wsum += sumambient(acol, r, rn, al, at->kid+i, ck0, s); |
406 |
|
} |
407 |
|
return(wsum); |
408 |
|
} |
409 |
|
|
410 |
|
|
411 |
|
double |
412 |
< |
makeambient(acol, r, al) /* make a new ambient value */ |
412 |
> |
makeambient(acol, r, rn, al) /* make a new ambient value */ |
413 |
|
COLOR acol; |
414 |
|
register RAY *r; |
415 |
+ |
FVECT rn; |
416 |
|
int al; |
417 |
|
{ |
418 |
< |
AMBVAL amb; |
418 |
> |
AMBVAL amb; |
419 |
|
FVECT gp, gd; |
420 |
|
/* compute weight */ |
421 |
|
amb.weight = pow(AVGREFL, (double)al); |
422 |
< |
if (r->rweight < 0.2*amb.weight) /* heuristic */ |
422 |
> |
if (r->rweight < 0.1*amb.weight) /* heuristic */ |
423 |
|
amb.weight = r->rweight; |
424 |
|
/* compute ambient */ |
425 |
|
amb.rad = doambient(acol, r, amb.weight, gp, gd); |
426 |
< |
if (amb.rad == 0.0) |
426 |
> |
if (amb.rad <= FTINY) |
427 |
|
return(0.0); |
428 |
|
/* store it */ |
429 |
|
VCOPY(amb.pos, r->rop); |
433 |
|
VCOPY(amb.gpos, gp); |
434 |
|
VCOPY(amb.gdir, gd); |
435 |
|
/* insert into tree */ |
436 |
< |
avinsert(&amb, &atrunk, thescene.cuorg, thescene.cusize); |
437 |
< |
avsave(&amb); /* write to file */ |
436 |
> |
avsave(&amb); /* and save to file */ |
437 |
> |
if (rn != r->ron) |
438 |
> |
extambient(acol, &amb, r->rop, rn); /* texture */ |
439 |
|
return(amb.rad); |
440 |
|
} |
441 |
|
|
442 |
|
|
443 |
+ |
void |
444 |
|
extambient(cr, ap, pv, nv) /* extrapolate value at pv, nv */ |
445 |
|
COLOR cr; |
446 |
< |
register AMBVAL *ap; |
446 |
> |
register AMBVAL *ap; |
447 |
|
FVECT pv, nv; |
448 |
|
{ |
449 |
< |
FVECT v1, v2; |
449 |
> |
FVECT v1; |
450 |
|
register int i; |
451 |
< |
double d; |
451 |
> |
double d; |
452 |
|
|
453 |
|
d = 1.0; /* zeroeth order */ |
454 |
|
/* gradient due to translation */ |
455 |
|
for (i = 0; i < 3; i++) |
456 |
|
d += ap->gpos[i]*(pv[i]-ap->pos[i]); |
457 |
|
/* gradient due to rotation */ |
458 |
< |
VCOPY(v1, ap->dir); |
459 |
< |
fcross(v2, v1, nv); |
274 |
< |
d += DOT(ap->gdir, v2); |
458 |
> |
VCROSS(v1, ap->dir, nv); |
459 |
> |
d += DOT(ap->gdir, v1); |
460 |
|
if (d <= 0.0) { |
461 |
|
setcolor(cr, 0.0, 0.0, 0.0); |
462 |
|
return; |
466 |
|
} |
467 |
|
|
468 |
|
|
469 |
< |
static |
470 |
< |
avsave(av) /* save an ambient value */ |
471 |
< |
AMBVAL *av; |
469 |
> |
static void |
470 |
> |
initambfile(creat) /* initialize ambient file */ |
471 |
> |
int creat; |
472 |
|
{ |
473 |
< |
#ifdef AMBFLUSH |
474 |
< |
static int nunflshed = 0; |
473 |
> |
extern char *progname, *octname; |
474 |
> |
static char *mybuf = NULL; |
475 |
> |
|
476 |
> |
#ifdef F_SETLKW |
477 |
> |
aflock(creat ? F_WRLCK : F_RDLCK); |
478 |
|
#endif |
479 |
+ |
SET_FILE_BINARY(ambfp); |
480 |
+ |
if (mybuf == NULL) |
481 |
+ |
mybuf = (char *)bmalloc(BUFSIZ+8); |
482 |
+ |
setbuf(ambfp, mybuf); |
483 |
+ |
if (creat) { /* new file */ |
484 |
+ |
newheader("RADIANCE", ambfp); |
485 |
+ |
fprintf(ambfp, "%s -av %g %g %g -aw %d -ab %d -aa %g ", |
486 |
+ |
progname, colval(ambval,RED), |
487 |
+ |
colval(ambval,GRN), colval(ambval,BLU), |
488 |
+ |
ambvwt, ambounce, ambacc); |
489 |
+ |
fprintf(ambfp, "-ad %d -as %d -ar %d ", |
490 |
+ |
ambdiv, ambssamp, ambres); |
491 |
+ |
if (octname != NULL) |
492 |
+ |
printargs(1, &octname, ambfp); |
493 |
+ |
else |
494 |
+ |
fputc('\n', ambfp); |
495 |
+ |
fprintf(ambfp, "SOFTWARE= %s\n", VersionID); |
496 |
+ |
fputnow(ambfp); |
497 |
+ |
fputformat(AMBFMT, ambfp); |
498 |
+ |
putc('\n', ambfp); |
499 |
+ |
putambmagic(ambfp); |
500 |
+ |
} else if (checkheader(ambfp, AMBFMT, NULL) < 0 || !hasambmagic(ambfp)) |
501 |
+ |
error(USER, "bad ambient file"); |
502 |
+ |
} |
503 |
+ |
|
504 |
+ |
|
505 |
+ |
static void |
506 |
+ |
avsave(av) /* insert and save an ambient value */ |
507 |
+ |
AMBVAL *av; |
508 |
+ |
{ |
509 |
+ |
avinsert(avstore(av)); |
510 |
|
if (ambfp == NULL) |
511 |
|
return; |
512 |
< |
if (fwrite((char *)av, sizeof(AMBVAL), 1, ambfp) != 1) |
512 |
> |
if (writambval(av, ambfp) < 0) |
513 |
|
goto writerr; |
514 |
< |
#ifdef AMBFLUSH |
515 |
< |
if (++nunflshed >= AMBFLUSH) { |
297 |
< |
if (fflush(ambfp) == EOF) |
514 |
> |
if (++nunflshed >= AMBFLUSH) |
515 |
> |
if (ambsync() == EOF) |
516 |
|
goto writerr; |
299 |
– |
nunflshed = 0; |
300 |
– |
} |
301 |
– |
#endif |
517 |
|
return; |
518 |
|
writerr: |
519 |
< |
error(SYSTEM, "error writing ambient file"); |
519 |
> |
error(SYSTEM, "error writing to ambient file"); |
520 |
|
} |
521 |
|
|
522 |
|
|
523 |
< |
static |
524 |
< |
avinsert(aval, at, c0, s) /* insert ambient value in a tree */ |
525 |
< |
AMBVAL *aval; |
311 |
< |
register AMBTREE *at; |
312 |
< |
FVECT c0; |
313 |
< |
double s; |
523 |
> |
static AMBVAL * |
524 |
> |
avstore(aval) /* allocate memory and store aval */ |
525 |
> |
register AMBVAL *aval; |
526 |
|
{ |
527 |
+ |
register AMBVAL *av; |
528 |
+ |
double d; |
529 |
+ |
|
530 |
+ |
if ((av = newambval()) == NULL) |
531 |
+ |
error(SYSTEM, "out of memory in avstore"); |
532 |
+ |
*av = *aval; |
533 |
+ |
av->latick = ambclock; |
534 |
+ |
av->next = NULL; |
535 |
+ |
nambvals++; |
536 |
+ |
d = bright(av->val); |
537 |
+ |
if (d > FTINY) { /* add to log sum for averaging */ |
538 |
+ |
avsum += log(d); |
539 |
+ |
navsum++; |
540 |
+ |
} |
541 |
+ |
return(av); |
542 |
+ |
} |
543 |
+ |
|
544 |
+ |
|
545 |
+ |
#define ATALLOCSZ 512 /* #/8 trees to allocate at once */ |
546 |
+ |
|
547 |
+ |
static AMBTREE *atfreelist = NULL; /* free ambient tree structures */ |
548 |
+ |
|
549 |
+ |
|
550 |
+ |
static AMBTREE * |
551 |
+ |
newambtree() /* allocate 8 ambient tree structs */ |
552 |
+ |
{ |
553 |
+ |
register AMBTREE *atp, *upperlim; |
554 |
+ |
|
555 |
+ |
if (atfreelist == NULL) { /* get more nodes */ |
556 |
+ |
atfreelist = (AMBTREE *)malloc(ATALLOCSZ*8*sizeof(AMBTREE)); |
557 |
+ |
if (atfreelist == NULL) |
558 |
+ |
return(NULL); |
559 |
+ |
/* link new free list */ |
560 |
+ |
upperlim = atfreelist + 8*(ATALLOCSZ-1); |
561 |
+ |
for (atp = atfreelist; atp < upperlim; atp += 8) |
562 |
+ |
atp->kid = atp + 8; |
563 |
+ |
atp->kid = NULL; |
564 |
+ |
} |
565 |
+ |
atp = atfreelist; |
566 |
+ |
atfreelist = atp->kid; |
567 |
+ |
memset((char *)atp, '\0', 8*sizeof(AMBTREE)); |
568 |
+ |
return(atp); |
569 |
+ |
} |
570 |
+ |
|
571 |
+ |
|
572 |
+ |
static void |
573 |
+ |
freeambtree(atp) /* free 8 ambient tree structs */ |
574 |
+ |
AMBTREE *atp; |
575 |
+ |
{ |
576 |
+ |
atp->kid = atfreelist; |
577 |
+ |
atfreelist = atp; |
578 |
+ |
} |
579 |
+ |
|
580 |
+ |
|
581 |
+ |
static void |
582 |
+ |
avinsert(av) /* insert ambient value in our tree */ |
583 |
+ |
register AMBVAL *av; |
584 |
+ |
{ |
585 |
+ |
register AMBTREE *at; |
586 |
+ |
register AMBVAL *ap; |
587 |
+ |
AMBVAL avh; |
588 |
|
FVECT ck0; |
589 |
+ |
double s; |
590 |
|
int branch; |
317 |
– |
register AMBVAL *av; |
591 |
|
register int i; |
592 |
|
|
593 |
< |
if ((av = newambval()) == NULL) |
594 |
< |
goto memerr; |
595 |
< |
copystruct(av, aval); |
596 |
< |
VCOPY(ck0, c0); |
593 |
> |
if (av->rad <= FTINY) |
594 |
> |
error(CONSISTENCY, "zero ambient radius in avinsert"); |
595 |
> |
at = &atrunk; |
596 |
> |
VCOPY(ck0, thescene.cuorg); |
597 |
> |
s = thescene.cusize; |
598 |
|
while (s*(OCTSCALE/2) > av->rad*ambacc) { |
599 |
|
if (at->kid == NULL) |
600 |
|
if ((at->kid = newambtree()) == NULL) |
601 |
< |
goto memerr; |
601 |
> |
error(SYSTEM, "out of memory in avinsert"); |
602 |
|
s *= 0.5; |
603 |
|
branch = 0; |
604 |
|
for (i = 0; i < 3; i++) |
608 |
|
} |
609 |
|
at = at->kid + branch; |
610 |
|
} |
611 |
< |
av->next = at->alist; |
612 |
< |
at->alist = av; |
613 |
< |
return; |
614 |
< |
memerr: |
615 |
< |
error(SYSTEM, "out of memory in avinsert"); |
611 |
> |
avh.next = at->alist; /* order by increasing level */ |
612 |
> |
for (ap = &avh; ap->next != NULL; ap = ap->next) |
613 |
> |
if (ap->next->lvl >= av->lvl) |
614 |
> |
break; |
615 |
> |
av->next = ap->next; |
616 |
> |
ap->next = av; |
617 |
> |
at->alist = avh.next; |
618 |
|
} |
619 |
+ |
|
620 |
+ |
|
621 |
+ |
static void |
622 |
+ |
unloadatree(at, f) /* unload an ambient value tree */ |
623 |
+ |
register AMBTREE *at; |
624 |
+ |
void (*f)(); |
625 |
+ |
{ |
626 |
+ |
register AMBVAL *av; |
627 |
+ |
register int i; |
628 |
+ |
/* transfer values at this node */ |
629 |
+ |
for (av = at->alist; av != NULL; av = at->alist) { |
630 |
+ |
at->alist = av->next; |
631 |
+ |
(*f)(av); |
632 |
+ |
} |
633 |
+ |
if (at->kid == NULL) |
634 |
+ |
return; |
635 |
+ |
for (i = 0; i < 8; i++) /* transfer and free children */ |
636 |
+ |
unloadatree(at->kid+i, f); |
637 |
+ |
freeambtree(at->kid); |
638 |
+ |
at->kid = NULL; |
639 |
+ |
} |
640 |
+ |
|
641 |
+ |
|
642 |
+ |
static struct avl { |
643 |
+ |
AMBVAL *p; |
644 |
+ |
unsigned long t; |
645 |
+ |
} *avlist1; /* ambient value list with ticks */ |
646 |
+ |
static AMBVAL **avlist2; /* memory positions for sorting */ |
647 |
+ |
static int i_avlist; /* index for lists */ |
648 |
+ |
|
649 |
+ |
|
650 |
+ |
static int |
651 |
+ |
av2list(av) |
652 |
+ |
register AMBVAL *av; |
653 |
+ |
{ |
654 |
+ |
#ifdef DEBUG |
655 |
+ |
if (i_avlist >= nambvals) |
656 |
+ |
error(CONSISTENCY, "too many ambient values in av2list1"); |
657 |
+ |
#endif |
658 |
+ |
avlist1[i_avlist].p = avlist2[i_avlist] = av; |
659 |
+ |
avlist1[i_avlist++].t = av->latick; |
660 |
+ |
} |
661 |
+ |
|
662 |
+ |
|
663 |
+ |
static int |
664 |
+ |
alatcmp(av1, av2) /* compare ambient values for MRA */ |
665 |
+ |
struct avl *av1, *av2; |
666 |
+ |
{ |
667 |
+ |
register long lc = av2->t - av1->t; |
668 |
+ |
return(lc<0 ? -1 : lc>0 ? 1 : 0); |
669 |
+ |
} |
670 |
+ |
|
671 |
+ |
|
672 |
+ |
/* GW NOTE 2002/10/3: |
673 |
+ |
* I used to compare AMBVAL pointers, but found that this was the |
674 |
+ |
* cause of a serious consistency error with gcc, since the optimizer |
675 |
+ |
* uses some dangerous trick in pointer subtraction that |
676 |
+ |
* assumes pointers differ by exact struct size increments. |
677 |
+ |
*/ |
678 |
+ |
static int |
679 |
+ |
aposcmp(avp1, avp2) /* compare ambient value positions */ |
680 |
+ |
const void *avp1, *avp2; |
681 |
+ |
{ |
682 |
+ |
register long diff = *(char * const *)avp1 - *(char * const *)avp2; |
683 |
+ |
if (diff < 0) |
684 |
+ |
return(-1); |
685 |
+ |
return(diff > 0); |
686 |
+ |
} |
687 |
+ |
|
688 |
+ |
#if 1 |
689 |
+ |
static int |
690 |
+ |
avlmemi(avaddr) /* find list position from address */ |
691 |
+ |
AMBVAL *avaddr; |
692 |
+ |
{ |
693 |
+ |
register AMBVAL **avlpp; |
694 |
+ |
|
695 |
+ |
avlpp = (AMBVAL **)bsearch((char *)&avaddr, (char *)avlist2, |
696 |
+ |
nambvals, sizeof(AMBVAL *), aposcmp); |
697 |
+ |
if (avlpp == NULL) |
698 |
+ |
error(CONSISTENCY, "address not found in avlmemi"); |
699 |
+ |
return(avlpp - avlist2); |
700 |
+ |
} |
701 |
+ |
#else |
702 |
+ |
#define avlmemi(avaddr) ((AMBVAL **)bsearch((char *)&avaddr,(char *)avlist2, \ |
703 |
+ |
nambvals,sizeof(AMBVAL *),aposcmp) - avlist2) |
704 |
+ |
#endif |
705 |
+ |
|
706 |
+ |
|
707 |
+ |
static void |
708 |
+ |
sortambvals(always) /* resort ambient values */ |
709 |
+ |
int always; |
710 |
+ |
{ |
711 |
+ |
AMBTREE oldatrunk; |
712 |
+ |
AMBVAL tav, *tap, *pnext; |
713 |
+ |
register int i, j; |
714 |
+ |
/* see if it's time yet */ |
715 |
+ |
if (!always && (ambclock++ < lastsort+sortintvl || |
716 |
+ |
nambvals < SORT_THRESH)) |
717 |
+ |
return; |
718 |
+ |
/* |
719 |
+ |
* The idea here is to minimize memory thrashing |
720 |
+ |
* in VM systems by improving reference locality. |
721 |
+ |
* We do this by periodically sorting our stored ambient |
722 |
+ |
* values in memory in order of most recently to least |
723 |
+ |
* recently accessed. This ordering was chosen so that new |
724 |
+ |
* ambient values (which tend to be less important) go into |
725 |
+ |
* higher memory with the infrequently accessed values. |
726 |
+ |
* Since we expect our values to need sorting less |
727 |
+ |
* frequently as the process continues, we double our |
728 |
+ |
* waiting interval after each call. |
729 |
+ |
* This routine is also called by setambacc() with |
730 |
+ |
* the "always" parameter set to 1 so that the ambient |
731 |
+ |
* tree will be rebuilt with the new accuracy parameter. |
732 |
+ |
*/ |
733 |
+ |
if (tracktime) { /* allocate pointer arrays to sort */ |
734 |
+ |
avlist2 = (AMBVAL **)malloc(nambvals*sizeof(AMBVAL *)); |
735 |
+ |
avlist1 = (struct avl *)malloc(nambvals*sizeof(struct avl)); |
736 |
+ |
} else { |
737 |
+ |
avlist2 = NULL; |
738 |
+ |
avlist1 = NULL; |
739 |
+ |
} |
740 |
+ |
if (avlist1 == NULL) { /* no time tracking -- rebuild tree? */ |
741 |
+ |
if (avlist2 != NULL) |
742 |
+ |
free((void *)avlist2); |
743 |
+ |
if (always) { /* rebuild without sorting */ |
744 |
+ |
oldatrunk = atrunk; |
745 |
+ |
atrunk.alist = NULL; |
746 |
+ |
atrunk.kid = NULL; |
747 |
+ |
unloadatree(&oldatrunk, avinsert); |
748 |
+ |
} |
749 |
+ |
} else { /* sort memory by last access time */ |
750 |
+ |
/* |
751 |
+ |
* Sorting memory is tricky because it isn't contiguous. |
752 |
+ |
* We have to sort an array of pointers by MRA and also |
753 |
+ |
* by memory position. We then copy values in "loops" |
754 |
+ |
* to minimize memory hits. Nevertheless, we will visit |
755 |
+ |
* everyone at least twice, and this is an expensive process |
756 |
+ |
* when we're thrashing, which is when we need to do it. |
757 |
+ |
*/ |
758 |
+ |
#ifdef DEBUG |
759 |
+ |
sprintf(errmsg, "sorting %u ambient values at ambclock=%lu...", |
760 |
+ |
nambvals, ambclock); |
761 |
+ |
eputs(errmsg); |
762 |
+ |
#endif |
763 |
+ |
i_avlist = 0; |
764 |
+ |
unloadatree(&atrunk, av2list); /* empty current tree */ |
765 |
+ |
#ifdef DEBUG |
766 |
+ |
if (i_avlist < nambvals) |
767 |
+ |
error(CONSISTENCY, "missing ambient values in sortambvals"); |
768 |
+ |
#endif |
769 |
+ |
qsort((char *)avlist1, nambvals, sizeof(struct avl), alatcmp); |
770 |
+ |
qsort((char *)avlist2, nambvals, sizeof(AMBVAL *), aposcmp); |
771 |
+ |
for (i = 0; i < nambvals; i++) { |
772 |
+ |
if (avlist1[i].p == NULL) |
773 |
+ |
continue; |
774 |
+ |
tap = avlist2[i]; |
775 |
+ |
tav = *tap; |
776 |
+ |
for (j = i; (pnext = avlist1[j].p) != tap; |
777 |
+ |
j = avlmemi(pnext)) { |
778 |
+ |
*(avlist2[j]) = *pnext; |
779 |
+ |
avinsert(avlist2[j]); |
780 |
+ |
avlist1[j].p = NULL; |
781 |
+ |
} |
782 |
+ |
*(avlist2[j]) = tav; |
783 |
+ |
avinsert(avlist2[j]); |
784 |
+ |
avlist1[j].p = NULL; |
785 |
+ |
} |
786 |
+ |
free((void *)avlist1); |
787 |
+ |
free((void *)avlist2); |
788 |
+ |
/* compute new sort interval */ |
789 |
+ |
sortintvl = ambclock - lastsort; |
790 |
+ |
if (sortintvl >= MAX_SORT_INTVL/2) |
791 |
+ |
sortintvl = MAX_SORT_INTVL; |
792 |
+ |
else |
793 |
+ |
sortintvl <<= 1; /* wait twice as long next */ |
794 |
+ |
#ifdef DEBUG |
795 |
+ |
eputs("done\n"); |
796 |
+ |
#endif |
797 |
+ |
} |
798 |
+ |
if (ambclock >= MAXACLOCK) |
799 |
+ |
ambclock = MAXACLOCK/2; |
800 |
+ |
lastsort = ambclock; |
801 |
+ |
} |
802 |
+ |
|
803 |
+ |
|
804 |
+ |
#ifdef F_SETLKW |
805 |
+ |
|
806 |
+ |
static void |
807 |
+ |
aflock(typ) /* lock/unlock ambient file */ |
808 |
+ |
int typ; |
809 |
+ |
{ |
810 |
+ |
static struct flock fls; /* static so initialized to zeroes */ |
811 |
+ |
|
812 |
+ |
fls.l_type = typ; |
813 |
+ |
if (fcntl(fileno(ambfp), F_SETLKW, &fls) < 0) |
814 |
+ |
error(SYSTEM, "cannot (un)lock ambient file"); |
815 |
+ |
} |
816 |
+ |
|
817 |
+ |
|
818 |
+ |
int |
819 |
+ |
ambsync() /* synchronize ambient file */ |
820 |
+ |
{ |
821 |
+ |
long flen; |
822 |
+ |
AMBVAL avs; |
823 |
+ |
register int n; |
824 |
+ |
|
825 |
+ |
if (nunflshed == 0) |
826 |
+ |
return(0); |
827 |
+ |
if (lastpos < 0) /* initializing (locked in initambfile) */ |
828 |
+ |
goto syncend; |
829 |
+ |
/* gain exclusive access */ |
830 |
+ |
aflock(F_WRLCK); |
831 |
+ |
/* see if file has grown */ |
832 |
+ |
if ((flen = lseek(fileno(ambfp), (off_t)0L, 2)) < 0) |
833 |
+ |
goto seekerr; |
834 |
+ |
if (n = flen - lastpos) { /* file has grown */ |
835 |
+ |
if (ambinp == NULL) { /* use duplicate filedes */ |
836 |
+ |
ambinp = fdopen(dup(fileno(ambfp)), "r"); |
837 |
+ |
if (ambinp == NULL) |
838 |
+ |
error(SYSTEM, "fdopen failed in ambsync"); |
839 |
+ |
} |
840 |
+ |
if (fseek(ambinp, lastpos, 0) < 0) |
841 |
+ |
goto seekerr; |
842 |
+ |
while (n >= AMBVALSIZ) { /* load contributed values */ |
843 |
+ |
if (!readambval(&avs, ambinp)) { |
844 |
+ |
sprintf(errmsg, |
845 |
+ |
"ambient file \"%s\" corrupted near character %ld", |
846 |
+ |
ambfile, flen - n); |
847 |
+ |
error(WARNING, errmsg); |
848 |
+ |
break; |
849 |
+ |
} |
850 |
+ |
avinsert(avstore(&avs)); |
851 |
+ |
n -= AMBVALSIZ; |
852 |
+ |
} |
853 |
+ |
/*** seek always as safety measure |
854 |
+ |
if (n) ***/ /* alignment */ |
855 |
+ |
if (lseek(fileno(ambfp), (off_t)(flen-n), 0) < 0) |
856 |
+ |
goto seekerr; |
857 |
+ |
} |
858 |
+ |
#ifdef DEBUG |
859 |
+ |
if (ambfp->_ptr - ambfp->_base != nunflshed*AMBVALSIZ) { |
860 |
+ |
sprintf(errmsg, "ambient file buffer at %d rather than %d", |
861 |
+ |
ambfp->_ptr - ambfp->_base, |
862 |
+ |
nunflshed*AMBVALSIZ); |
863 |
+ |
error(CONSISTENCY, errmsg); |
864 |
+ |
} |
865 |
+ |
#endif |
866 |
+ |
syncend: |
867 |
+ |
n = fflush(ambfp); /* calls write() at last */ |
868 |
+ |
if ((lastpos = lseek(fileno(ambfp), (off_t)0L, 1)) < 0) |
869 |
+ |
goto seekerr; |
870 |
+ |
aflock(F_UNLCK); /* release file */ |
871 |
+ |
nunflshed = 0; |
872 |
+ |
return(n); |
873 |
+ |
seekerr: |
874 |
+ |
error(SYSTEM, "seek failed in ambsync"); |
875 |
+ |
} |
876 |
+ |
|
877 |
+ |
#else |
878 |
+ |
|
879 |
+ |
int |
880 |
+ |
ambsync() /* flush ambient file */ |
881 |
+ |
{ |
882 |
+ |
if (nunflshed == 0) |
883 |
+ |
return(0); |
884 |
+ |
nunflshed = 0; |
885 |
+ |
return(fflush(ambfp)); |
886 |
+ |
} |
887 |
+ |
|
888 |
+ |
#endif |