1 |
greg |
2.38 |
/* Copyright (c) 1996 Regents of the University of California */ |
2 |
greg |
1.1 |
|
3 |
|
|
#ifndef lint |
4 |
|
|
static char SCCSid[] = "$SunId$ LBL"; |
5 |
|
|
#endif |
6 |
|
|
|
7 |
|
|
/* |
8 |
|
|
* ambient.c - routines dealing with ambient (inter-reflected) component. |
9 |
|
|
*/ |
10 |
|
|
|
11 |
|
|
#include "ray.h" |
12 |
|
|
|
13 |
|
|
#include "octree.h" |
14 |
|
|
|
15 |
greg |
1.8 |
#include "otypes.h" |
16 |
|
|
|
17 |
greg |
1.14 |
#include "ambient.h" |
18 |
|
|
|
19 |
greg |
1.1 |
#include "random.h" |
20 |
|
|
|
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 |
1.14 |
typedef struct ambtree { |
26 |
greg |
2.12 |
AMBVAL *alist; /* ambient value list */ |
27 |
|
|
struct ambtree *kid; /* 8 child nodes */ |
28 |
greg |
1.14 |
} AMBTREE; /* ambient octree */ |
29 |
|
|
|
30 |
greg |
1.1 |
extern CUBE thescene; /* contains space boundaries */ |
31 |
|
|
|
32 |
greg |
2.27 |
extern char *shm_boundary; /* memory sharing boundary */ |
33 |
greg |
2.26 |
|
34 |
greg |
2.12 |
#define MAXASET 511 /* maximum number of elements in ambient set */ |
35 |
|
|
OBJECT ambset[MAXASET+1]={0}; /* ambient include/exclude set */ |
36 |
greg |
1.1 |
|
37 |
greg |
2.12 |
double maxarad; /* maximum ambient radius */ |
38 |
|
|
double minarad; /* minimum ambient radius */ |
39 |
greg |
1.1 |
|
40 |
greg |
2.12 |
static AMBTREE atrunk; /* our ambient trunk node */ |
41 |
greg |
1.1 |
|
42 |
|
|
static FILE *ambfp = NULL; /* ambient file pointer */ |
43 |
greg |
2.16 |
static int nunflshed = 0; /* number of unflushed ambient values */ |
44 |
greg |
1.1 |
|
45 |
greg |
2.26 |
#ifndef SORT_THRESH |
46 |
|
|
#ifdef BIGMEM |
47 |
greg |
2.27 |
#define SORT_THRESH ((9L<<20)/sizeof(AMBVAL)) |
48 |
greg |
2.26 |
#else |
49 |
greg |
2.27 |
#define SORT_THRESH ((3L<<20)/sizeof(AMBVAL)) |
50 |
greg |
2.26 |
#endif |
51 |
|
|
#endif |
52 |
|
|
#ifndef SORT_INTVL |
53 |
greg |
2.41 |
#define SORT_INTVL (SORT_THRESH<<1) |
54 |
greg |
2.26 |
#endif |
55 |
greg |
2.28 |
#ifndef MAX_SORT_INTVL |
56 |
greg |
2.41 |
#define MAX_SORT_INTVL (SORT_INTVL<<6) |
57 |
greg |
2.28 |
#endif |
58 |
greg |
2.26 |
|
59 |
gregl |
2.43 |
static double avsum = 0.; /* computed ambient value sum (log) */ |
60 |
|
|
static unsigned int navsum = 0; /* number of values in avsum */ |
61 |
greg |
2.35 |
static unsigned int nambvals = 0; /* total number of indirect values */ |
62 |
|
|
static unsigned int nambshare = 0; /* number of values from file */ |
63 |
greg |
2.27 |
static unsigned long ambclock = 0; /* ambient access clock */ |
64 |
|
|
static unsigned long lastsort = 0; /* time of last value sort */ |
65 |
greg |
2.26 |
static long sortintvl = SORT_INTVL; /* time until next sort */ |
66 |
|
|
|
67 |
|
|
#define MAXACLOCK (1L<<30) /* clock turnover value */ |
68 |
greg |
2.27 |
/* |
69 |
|
|
* Track access times unless we are sharing ambient values |
70 |
|
|
* through memory on a multiprocessor, when we want to avoid |
71 |
greg |
2.35 |
* claiming our own memory (copy on write). Go ahead anyway |
72 |
|
|
* if more than two thirds of our values are unshared. |
73 |
gregl |
2.43 |
* Compile with -Dtracktime=0 to turn this code off. |
74 |
greg |
2.27 |
*/ |
75 |
gregl |
2.43 |
#ifndef tracktime |
76 |
greg |
2.35 |
#define tracktime (shm_boundary == NULL || nambvals > 3*nambshare) |
77 |
gregl |
2.43 |
#endif |
78 |
greg |
2.26 |
|
79 |
greg |
2.12 |
#define AMBFLUSH (BUFSIZ/AMBVALSIZ) |
80 |
greg |
2.6 |
|
81 |
greg |
2.12 |
#define newambval() (AMBVAL *)bmalloc(sizeof(AMBVAL)) |
82 |
greg |
1.1 |
|
83 |
greg |
2.40 |
static int initambfile(), avsave(), avinsert(), sortambvals(), avlmemi(); |
84 |
greg |
2.20 |
static AMBVAL *avstore(); |
85 |
greg |
2.19 |
#ifdef F_SETLKW |
86 |
|
|
static aflock(); |
87 |
|
|
#endif |
88 |
greg |
1.1 |
|
89 |
greg |
2.7 |
|
90 |
greg |
2.3 |
setambres(ar) /* set ambient resolution */ |
91 |
|
|
int ar; |
92 |
|
|
{ |
93 |
greg |
2.21 |
ambres = ar < 0 ? 0 : ar; /* may be done already */ |
94 |
greg |
2.3 |
/* set min & max radii */ |
95 |
|
|
if (ar <= 0) { |
96 |
greg |
2.25 |
minarad = 0; |
97 |
greg |
2.3 |
maxarad = thescene.cusize / 2.0; |
98 |
|
|
} else { |
99 |
|
|
minarad = thescene.cusize / ar; |
100 |
greg |
2.30 |
maxarad = 64 * minarad; /* heuristic */ |
101 |
greg |
2.3 |
if (maxarad > thescene.cusize / 2.0) |
102 |
|
|
maxarad = thescene.cusize / 2.0; |
103 |
|
|
} |
104 |
greg |
2.25 |
if (minarad <= FTINY) |
105 |
|
|
minarad = 10*FTINY; |
106 |
|
|
if (maxarad <= minarad) |
107 |
|
|
maxarad = 64 * minarad; |
108 |
greg |
2.3 |
} |
109 |
|
|
|
110 |
|
|
|
111 |
greg |
2.21 |
setambacc(newa) /* set ambient accuracy */ |
112 |
greg |
2.20 |
double newa; |
113 |
|
|
{ |
114 |
greg |
2.33 |
double ambdiff; |
115 |
greg |
2.20 |
|
116 |
greg |
2.33 |
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 |
greg |
2.20 |
} |
122 |
|
|
|
123 |
|
|
|
124 |
greg |
1.1 |
setambient(afile) /* initialize calculation */ |
125 |
|
|
char *afile; |
126 |
|
|
{ |
127 |
greg |
2.37 |
long pos, flen; |
128 |
greg |
2.12 |
AMBVAL amb; |
129 |
greg |
2.3 |
/* init ambient limits */ |
130 |
|
|
setambres(ambres); |
131 |
greg |
2.21 |
setambacc(ambacc); |
132 |
greg |
2.19 |
if (afile == NULL) |
133 |
|
|
return; |
134 |
greg |
2.20 |
if (ambacc <= FTINY) { |
135 |
greg |
2.21 |
sprintf(errmsg, "zero ambient accuracy so \"%s\" not opened", |
136 |
greg |
2.20 |
afile); |
137 |
|
|
error(WARNING, errmsg); |
138 |
|
|
return; |
139 |
|
|
} |
140 |
greg |
2.3 |
/* open ambient file */ |
141 |
greg |
2.19 |
if ((ambfp = fopen(afile, "r+")) != NULL) { |
142 |
|
|
initambfile(0); |
143 |
greg |
2.37 |
pos = ftell(ambfp); |
144 |
greg |
2.19 |
while (readambval(&amb, ambfp)) |
145 |
greg |
2.21 |
avinsert(avstore(&amb)); |
146 |
greg |
2.19 |
/* align */ |
147 |
greg |
2.37 |
pos += (long)nambvals*AMBVALSIZ; |
148 |
|
|
flen = lseek(fileno(ambfp), 0L, 2); |
149 |
|
|
if (flen != pos) { |
150 |
greg |
2.42 |
sprintf(errmsg, |
151 |
greg |
2.37 |
"ignoring last %ld values in ambient file (corrupted)", |
152 |
|
|
(flen - pos)/AMBVALSIZ); |
153 |
greg |
2.42 |
error(WARNING, errmsg); |
154 |
greg |
2.37 |
fseek(ambfp, pos, 0); |
155 |
|
|
ftruncate(fileno(ambfp), pos); |
156 |
|
|
} |
157 |
greg |
2.35 |
nambshare = nambvals; |
158 |
greg |
2.19 |
} else if ((ambfp = fopen(afile, "w+")) != NULL) |
159 |
|
|
initambfile(1); |
160 |
|
|
else { |
161 |
|
|
sprintf(errmsg, "cannot open ambient file \"%s\"", afile); |
162 |
|
|
error(SYSTEM, errmsg); |
163 |
greg |
2.16 |
} |
164 |
greg |
2.19 |
nunflshed++; /* lie */ |
165 |
|
|
ambsync(); |
166 |
greg |
1.8 |
} |
167 |
|
|
|
168 |
|
|
|
169 |
|
|
ambnotify(obj) /* record new modifier */ |
170 |
greg |
2.12 |
OBJECT obj; |
171 |
greg |
1.8 |
{ |
172 |
greg |
1.11 |
static int hitlimit = 0; |
173 |
greg |
2.12 |
register OBJREC *o = objptr(obj); |
174 |
greg |
1.8 |
register char **amblp; |
175 |
|
|
|
176 |
greg |
1.11 |
if (hitlimit || !ismodifier(o->otype)) |
177 |
greg |
1.8 |
return; |
178 |
|
|
for (amblp = amblist; *amblp != NULL; amblp++) |
179 |
|
|
if (!strcmp(o->oname, *amblp)) { |
180 |
greg |
1.11 |
if (ambset[0] >= MAXASET) { |
181 |
|
|
error(WARNING, "too many modifiers in ambient list"); |
182 |
|
|
hitlimit++; |
183 |
|
|
return; /* should this be fatal? */ |
184 |
|
|
} |
185 |
greg |
1.8 |
insertelem(ambset, obj); |
186 |
|
|
return; |
187 |
greg |
1.1 |
} |
188 |
|
|
} |
189 |
|
|
|
190 |
|
|
|
191 |
greg |
2.34 |
ambient(acol, r, nrm) /* compute ambient component for ray */ |
192 |
greg |
1.1 |
COLOR acol; |
193 |
|
|
register RAY *r; |
194 |
greg |
2.34 |
FVECT nrm; |
195 |
greg |
1.1 |
{ |
196 |
|
|
static int rdepth = 0; /* ambient recursion */ |
197 |
gregl |
2.43 |
double d, l; |
198 |
greg |
1.1 |
|
199 |
|
|
if (ambdiv <= 0) /* no ambient calculation */ |
200 |
|
|
goto dumbamb; |
201 |
|
|
/* check number of bounces */ |
202 |
greg |
1.16 |
if (rdepth >= ambounce) |
203 |
greg |
1.1 |
goto dumbamb; |
204 |
|
|
/* check ambient list */ |
205 |
|
|
if (ambincl != -1 && r->ro != NULL && |
206 |
|
|
ambincl != inset(ambset, r->ro->omod)) |
207 |
|
|
goto dumbamb; |
208 |
|
|
|
209 |
|
|
if (ambacc <= FTINY) { /* no ambient storage */ |
210 |
greg |
1.16 |
rdepth++; |
211 |
|
|
d = doambient(acol, r, r->rweight, NULL, NULL); |
212 |
|
|
rdepth--; |
213 |
greg |
2.32 |
if (d <= FTINY) |
214 |
greg |
1.1 |
goto dumbamb; |
215 |
greg |
1.16 |
return; |
216 |
greg |
1.1 |
} |
217 |
greg |
2.40 |
|
218 |
|
|
if (tracktime) /* sort to minimize thrashing */ |
219 |
|
|
sortambvals(0); |
220 |
greg |
1.1 |
/* get ambient value */ |
221 |
|
|
setcolor(acol, 0.0, 0.0, 0.0); |
222 |
greg |
2.34 |
d = sumambient(acol, r, nrm, rdepth, |
223 |
greg |
1.16 |
&atrunk, thescene.cuorg, thescene.cusize); |
224 |
greg |
2.32 |
if (d > FTINY) { |
225 |
greg |
1.16 |
scalecolor(acol, 1.0/d); |
226 |
greg |
2.32 |
return; |
227 |
greg |
1.16 |
} |
228 |
greg |
2.33 |
rdepth++; /* need to cache new value */ |
229 |
greg |
2.34 |
d = makeambient(acol, r, nrm, rdepth-1); |
230 |
greg |
2.32 |
rdepth--; |
231 |
greg |
1.16 |
if (d > FTINY) |
232 |
|
|
return; |
233 |
greg |
1.1 |
dumbamb: /* return global value */ |
234 |
|
|
copycolor(acol, ambval); |
235 |
gregl |
2.43 |
if (ambvwt <= 0 | navsum == 0) |
236 |
greg |
2.32 |
return; |
237 |
gregl |
2.43 |
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 |
greg |
1.1 |
} |
248 |
|
|
|
249 |
|
|
|
250 |
|
|
double |
251 |
greg |
2.34 |
sumambient(acol, r, rn, al, at, c0, s) /* get interpolated ambient value */ |
252 |
greg |
1.1 |
COLOR acol; |
253 |
|
|
register RAY *r; |
254 |
greg |
2.34 |
FVECT rn; |
255 |
greg |
1.16 |
int al; |
256 |
greg |
2.12 |
AMBTREE *at; |
257 |
greg |
1.1 |
FVECT c0; |
258 |
greg |
2.12 |
double s; |
259 |
greg |
1.1 |
{ |
260 |
greg |
2.12 |
double d, e1, e2, wt, wsum; |
261 |
greg |
1.1 |
COLOR ct; |
262 |
|
|
FVECT ck0; |
263 |
|
|
int i; |
264 |
|
|
register int j; |
265 |
greg |
2.12 |
register AMBVAL *av; |
266 |
greg |
2.29 |
|
267 |
|
|
wsum = 0.0; |
268 |
greg |
1.7 |
/* do this node */ |
269 |
greg |
1.1 |
for (av = at->alist; av != NULL; av = av->next) { |
270 |
greg |
2.26 |
if (tracktime) |
271 |
greg |
2.40 |
av->latick = ambclock; |
272 |
greg |
1.1 |
/* |
273 |
greg |
1.16 |
* Ambient level test. |
274 |
greg |
1.1 |
*/ |
275 |
greg |
2.23 |
if (av->lvl > al) /* list sorted, so this works */ |
276 |
|
|
break; |
277 |
|
|
if (av->weight < r->rweight-FTINY) |
278 |
greg |
1.1 |
continue; |
279 |
|
|
/* |
280 |
|
|
* Ambient radius test. |
281 |
|
|
*/ |
282 |
greg |
2.29 |
d = av->pos[0] - r->rop[0]; |
283 |
|
|
e1 = d * d; |
284 |
|
|
d = av->pos[1] - r->rop[1]; |
285 |
|
|
e1 += d * d; |
286 |
|
|
d = av->pos[2] - r->rop[2]; |
287 |
|
|
e1 += d * d; |
288 |
greg |
1.1 |
e1 /= av->rad * av->rad; |
289 |
|
|
if (e1 > ambacc*ambacc*1.21) |
290 |
|
|
continue; |
291 |
|
|
/* |
292 |
|
|
* Normal direction test. |
293 |
|
|
*/ |
294 |
|
|
e2 = (1.0 - DOT(av->dir, r->ron)) * r->rweight; |
295 |
|
|
if (e2 < 0.0) e2 = 0.0; |
296 |
|
|
if (e1 + e2 > ambacc*ambacc*1.21) |
297 |
|
|
continue; |
298 |
|
|
/* |
299 |
|
|
* Ray behind test. |
300 |
|
|
*/ |
301 |
|
|
d = 0.0; |
302 |
|
|
for (j = 0; j < 3; j++) |
303 |
|
|
d += (r->rop[j] - av->pos[j]) * |
304 |
|
|
(av->dir[j] + r->ron[j]); |
305 |
greg |
1.18 |
if (d*0.5 < -minarad*ambacc-.001) |
306 |
greg |
1.1 |
continue; |
307 |
|
|
/* |
308 |
|
|
* Jittering final test reduces image artifacts. |
309 |
|
|
*/ |
310 |
|
|
wt = sqrt(e1) + sqrt(e2); |
311 |
greg |
2.31 |
if (wt > ambacc*(.9+.2*urand(9015+samplendx))) |
312 |
greg |
1.1 |
continue; |
313 |
|
|
if (wt <= 1e-3) |
314 |
|
|
wt = 1e3; |
315 |
|
|
else |
316 |
|
|
wt = 1.0 / wt; |
317 |
|
|
wsum += wt; |
318 |
greg |
2.34 |
extambient(ct, av, r->rop, rn); |
319 |
greg |
1.1 |
scalecolor(ct, wt); |
320 |
|
|
addcolor(acol, ct); |
321 |
greg |
1.7 |
} |
322 |
|
|
if (at->kid == NULL) |
323 |
|
|
return(wsum); |
324 |
|
|
/* do children */ |
325 |
|
|
s *= 0.5; |
326 |
|
|
for (i = 0; i < 8; i++) { |
327 |
|
|
for (j = 0; j < 3; j++) { |
328 |
|
|
ck0[j] = c0[j]; |
329 |
|
|
if (1<<j & i) |
330 |
|
|
ck0[j] += s; |
331 |
|
|
if (r->rop[j] < ck0[j] - OCTSCALE*s) |
332 |
|
|
break; |
333 |
|
|
if (r->rop[j] > ck0[j] + (1.0+OCTSCALE)*s) |
334 |
|
|
break; |
335 |
|
|
} |
336 |
|
|
if (j == 3) |
337 |
greg |
2.34 |
wsum += sumambient(acol, r, rn, al, at->kid+i, ck0, s); |
338 |
greg |
1.1 |
} |
339 |
|
|
return(wsum); |
340 |
|
|
} |
341 |
|
|
|
342 |
|
|
|
343 |
|
|
double |
344 |
greg |
2.34 |
makeambient(acol, r, rn, al) /* make a new ambient value */ |
345 |
greg |
1.1 |
COLOR acol; |
346 |
|
|
register RAY *r; |
347 |
greg |
2.34 |
FVECT rn; |
348 |
greg |
1.16 |
int al; |
349 |
greg |
1.1 |
{ |
350 |
greg |
2.12 |
AMBVAL amb; |
351 |
greg |
1.14 |
FVECT gp, gd; |
352 |
greg |
1.16 |
/* compute weight */ |
353 |
|
|
amb.weight = pow(AVGREFL, (double)al); |
354 |
greg |
2.33 |
if (r->rweight < 0.1*amb.weight) /* heuristic */ |
355 |
greg |
1.16 |
amb.weight = r->rweight; |
356 |
|
|
/* compute ambient */ |
357 |
|
|
amb.rad = doambient(acol, r, amb.weight, gp, gd); |
358 |
greg |
2.33 |
if (amb.rad <= FTINY) |
359 |
greg |
1.1 |
return(0.0); |
360 |
|
|
/* store it */ |
361 |
|
|
VCOPY(amb.pos, r->rop); |
362 |
|
|
VCOPY(amb.dir, r->ron); |
363 |
greg |
1.16 |
amb.lvl = al; |
364 |
greg |
1.1 |
copycolor(amb.val, acol); |
365 |
greg |
1.14 |
VCOPY(amb.gpos, gp); |
366 |
|
|
VCOPY(amb.gdir, gd); |
367 |
greg |
1.1 |
/* insert into tree */ |
368 |
greg |
2.7 |
avsave(&amb); /* and save to file */ |
369 |
greg |
2.34 |
if (rn != r->ron) |
370 |
|
|
extambient(acol, &amb, r->rop, rn); /* texture */ |
371 |
greg |
1.1 |
return(amb.rad); |
372 |
greg |
1.15 |
} |
373 |
|
|
|
374 |
|
|
|
375 |
|
|
extambient(cr, ap, pv, nv) /* extrapolate value at pv, nv */ |
376 |
|
|
COLOR cr; |
377 |
greg |
2.12 |
register AMBVAL *ap; |
378 |
greg |
1.15 |
FVECT pv, nv; |
379 |
|
|
{ |
380 |
|
|
FVECT v1, v2; |
381 |
|
|
register int i; |
382 |
greg |
2.12 |
double d; |
383 |
greg |
1.15 |
|
384 |
|
|
d = 1.0; /* zeroeth order */ |
385 |
|
|
/* gradient due to translation */ |
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); |
391 |
|
|
d += DOT(ap->gdir, v2); |
392 |
|
|
if (d <= 0.0) { |
393 |
|
|
setcolor(cr, 0.0, 0.0, 0.0); |
394 |
|
|
return; |
395 |
|
|
} |
396 |
|
|
copycolor(cr, ap->val); |
397 |
|
|
scalecolor(cr, d); |
398 |
greg |
1.1 |
} |
399 |
|
|
|
400 |
|
|
|
401 |
|
|
static |
402 |
greg |
2.9 |
initambfile(creat) /* initialize ambient file */ |
403 |
|
|
int creat; |
404 |
|
|
{ |
405 |
|
|
extern char *progname, *octname, VersionID[]; |
406 |
|
|
|
407 |
greg |
2.19 |
#ifdef F_SETLKW |
408 |
|
|
aflock(creat ? F_WRLCK : F_RDLCK); |
409 |
|
|
#endif |
410 |
greg |
2.12 |
#ifdef MSDOS |
411 |
|
|
setmode(fileno(ambfp), O_BINARY); |
412 |
|
|
#endif |
413 |
greg |
2.21 |
setbuf(ambfp, bmalloc(BUFSIZ+8)); |
414 |
greg |
2.9 |
if (creat) { /* new file */ |
415 |
greg |
2.24 |
newheader("RADIANCE", ambfp); |
416 |
greg |
2.41 |
fprintf(ambfp, "%s -av %g %g %g -aw %d -ab %d -aa %g ", |
417 |
greg |
2.9 |
progname, colval(ambval,RED), |
418 |
|
|
colval(ambval,GRN), colval(ambval,BLU), |
419 |
greg |
2.41 |
ambvwt, ambounce, ambacc); |
420 |
greg |
2.9 |
fprintf(ambfp, "-ad %d -as %d -ar %d %s\n", |
421 |
|
|
ambdiv, ambssamp, ambres, |
422 |
|
|
octname==NULL ? "" : octname); |
423 |
|
|
fprintf(ambfp, "SOFTWARE= %s\n", VersionID); |
424 |
|
|
fputformat(AMBFMT, ambfp); |
425 |
|
|
putc('\n', ambfp); |
426 |
|
|
putambmagic(ambfp); |
427 |
greg |
2.17 |
} else if (checkheader(ambfp, AMBFMT, NULL) < 0 || !hasambmagic(ambfp)) |
428 |
|
|
error(USER, "bad ambient file"); |
429 |
greg |
2.9 |
} |
430 |
|
|
|
431 |
|
|
|
432 |
|
|
static |
433 |
greg |
2.7 |
avsave(av) /* insert and save an ambient value */ |
434 |
greg |
2.12 |
AMBVAL *av; |
435 |
greg |
1.1 |
{ |
436 |
greg |
2.21 |
avinsert(avstore(av)); |
437 |
greg |
1.1 |
if (ambfp == NULL) |
438 |
|
|
return; |
439 |
greg |
2.5 |
if (writambval(av, ambfp) < 0) |
440 |
greg |
1.1 |
goto writerr; |
441 |
greg |
2.16 |
if (++nunflshed >= AMBFLUSH) |
442 |
greg |
2.7 |
if (ambsync() == EOF) |
443 |
greg |
1.1 |
goto writerr; |
444 |
|
|
return; |
445 |
|
|
writerr: |
446 |
greg |
2.17 |
error(SYSTEM, "error writing ambient file"); |
447 |
greg |
1.1 |
} |
448 |
|
|
|
449 |
|
|
|
450 |
greg |
2.20 |
static AMBVAL * |
451 |
|
|
avstore(aval) /* allocate memory and store aval */ |
452 |
|
|
register AMBVAL *aval; |
453 |
|
|
{ |
454 |
|
|
register AMBVAL *av; |
455 |
gregl |
2.43 |
double d; |
456 |
greg |
2.20 |
|
457 |
|
|
if ((av = newambval()) == NULL) |
458 |
|
|
error(SYSTEM, "out of memory in avstore"); |
459 |
|
|
copystruct(av, aval); |
460 |
greg |
2.26 |
av->latick = ambclock; |
461 |
|
|
av->next = NULL; |
462 |
|
|
nambvals++; |
463 |
gregl |
2.43 |
d = bright(av->val); |
464 |
|
|
if (d > FTINY) { /* add to log sum for averaging */ |
465 |
|
|
avsum += log(d); |
466 |
|
|
navsum++; |
467 |
|
|
} |
468 |
greg |
2.20 |
return(av); |
469 |
|
|
} |
470 |
|
|
|
471 |
|
|
|
472 |
greg |
2.26 |
#define ATALLOCSZ 512 /* #/8 trees to allocate at once */ |
473 |
|
|
|
474 |
|
|
static AMBTREE *atfreelist = NULL; /* free ambient tree structures */ |
475 |
|
|
|
476 |
|
|
|
477 |
greg |
1.1 |
static |
478 |
greg |
2.26 |
AMBTREE * |
479 |
|
|
newambtree() /* allocate 8 ambient tree structs */ |
480 |
|
|
{ |
481 |
|
|
register AMBTREE *atp, *upperlim; |
482 |
|
|
|
483 |
|
|
if (atfreelist == NULL) { /* get more nodes */ |
484 |
|
|
atfreelist = (AMBTREE *)bmalloc(ATALLOCSZ*8*sizeof(AMBTREE)); |
485 |
|
|
if (atfreelist == NULL) |
486 |
|
|
return(NULL); |
487 |
|
|
/* link new free list */ |
488 |
|
|
upperlim = atfreelist + 8*(ATALLOCSZ-1); |
489 |
|
|
for (atp = atfreelist; atp < upperlim; atp += 8) |
490 |
|
|
atp->kid = atp + 8; |
491 |
|
|
atp->kid = NULL; |
492 |
|
|
} |
493 |
|
|
atp = atfreelist; |
494 |
|
|
atfreelist = atp->kid; |
495 |
|
|
bzero((char *)atp, 8*sizeof(AMBTREE)); |
496 |
|
|
return(atp); |
497 |
|
|
} |
498 |
|
|
|
499 |
|
|
|
500 |
|
|
static |
501 |
|
|
freeambtree(atp) /* free 8 ambient tree structs */ |
502 |
|
|
AMBTREE *atp; |
503 |
|
|
{ |
504 |
|
|
atp->kid = atfreelist; |
505 |
|
|
atfreelist = atp; |
506 |
|
|
} |
507 |
|
|
|
508 |
|
|
|
509 |
|
|
static |
510 |
greg |
2.21 |
avinsert(av) /* insert ambient value in our tree */ |
511 |
greg |
2.20 |
register AMBVAL *av; |
512 |
greg |
1.1 |
{ |
513 |
greg |
2.21 |
register AMBTREE *at; |
514 |
greg |
2.23 |
register AMBVAL *ap; |
515 |
|
|
AMBVAL avh; |
516 |
greg |
1.1 |
FVECT ck0; |
517 |
greg |
2.21 |
double s; |
518 |
greg |
1.1 |
int branch; |
519 |
|
|
register int i; |
520 |
|
|
|
521 |
greg |
2.20 |
if (av->rad <= FTINY) |
522 |
|
|
error(CONSISTENCY, "zero ambient radius in avinsert"); |
523 |
greg |
2.21 |
at = &atrunk; |
524 |
|
|
VCOPY(ck0, thescene.cuorg); |
525 |
|
|
s = thescene.cusize; |
526 |
greg |
1.1 |
while (s*(OCTSCALE/2) > av->rad*ambacc) { |
527 |
|
|
if (at->kid == NULL) |
528 |
|
|
if ((at->kid = newambtree()) == NULL) |
529 |
greg |
2.20 |
error(SYSTEM, "out of memory in avinsert"); |
530 |
greg |
1.1 |
s *= 0.5; |
531 |
|
|
branch = 0; |
532 |
|
|
for (i = 0; i < 3; i++) |
533 |
|
|
if (av->pos[i] > ck0[i] + s) { |
534 |
|
|
ck0[i] += s; |
535 |
|
|
branch |= 1 << i; |
536 |
|
|
} |
537 |
|
|
at = at->kid + branch; |
538 |
|
|
} |
539 |
greg |
2.23 |
avh.next = at->alist; /* order by increasing level */ |
540 |
|
|
for (ap = &avh; ap->next != NULL; ap = ap->next) |
541 |
|
|
if (ap->next->lvl >= av->lvl) |
542 |
|
|
break; |
543 |
|
|
av->next = ap->next; |
544 |
|
|
ap->next = av; |
545 |
|
|
at->alist = avh.next; |
546 |
greg |
2.7 |
} |
547 |
|
|
|
548 |
|
|
|
549 |
greg |
2.20 |
static |
550 |
greg |
2.26 |
unloadatree(at, f) /* unload an ambient value tree */ |
551 |
greg |
2.20 |
register AMBTREE *at; |
552 |
greg |
2.26 |
int (*f)(); |
553 |
greg |
2.20 |
{ |
554 |
|
|
register AMBVAL *av; |
555 |
|
|
register int i; |
556 |
|
|
/* transfer values at this node */ |
557 |
|
|
for (av = at->alist; av != NULL; av = at->alist) { |
558 |
|
|
at->alist = av->next; |
559 |
greg |
2.26 |
(*f)(av); |
560 |
greg |
2.20 |
} |
561 |
greg |
2.21 |
if (at->kid == NULL) |
562 |
|
|
return; |
563 |
greg |
2.20 |
for (i = 0; i < 8; i++) /* transfer and free children */ |
564 |
greg |
2.26 |
unloadatree(at->kid+i, f); |
565 |
greg |
2.20 |
freeambtree(at->kid); |
566 |
greg |
2.26 |
at->kid = NULL; |
567 |
|
|
} |
568 |
|
|
|
569 |
|
|
|
570 |
greg |
2.39 |
static struct avl { |
571 |
|
|
AMBVAL *p; |
572 |
|
|
unsigned long t; |
573 |
|
|
} *avlist1; /* ambient value list with ticks */ |
574 |
|
|
static AMBVAL **avlist2; /* memory positions for sorting */ |
575 |
greg |
2.26 |
static int i_avlist; /* index for lists */ |
576 |
|
|
|
577 |
|
|
|
578 |
|
|
static |
579 |
|
|
av2list(av) |
580 |
greg |
2.39 |
register AMBVAL *av; |
581 |
greg |
2.26 |
{ |
582 |
greg |
2.27 |
#ifdef DEBUG |
583 |
greg |
2.26 |
if (i_avlist >= nambvals) |
584 |
|
|
error(CONSISTENCY, "too many ambient values in av2list1"); |
585 |
greg |
2.27 |
#endif |
586 |
greg |
2.39 |
avlist1[i_avlist].p = avlist2[i_avlist] = av; |
587 |
|
|
avlist1[i_avlist++].t = av->latick; |
588 |
greg |
2.26 |
} |
589 |
|
|
|
590 |
|
|
|
591 |
|
|
static int |
592 |
greg |
2.39 |
alatcmp(av1, av2) /* compare ambient values for MRA */ |
593 |
|
|
struct avl *av1, *av2; |
594 |
greg |
2.26 |
{ |
595 |
greg |
2.39 |
register long lc = av2->t - av1->t; |
596 |
greg |
2.38 |
return(lc<0 ? -1 : lc>0 ? 1 : 0); |
597 |
greg |
2.26 |
} |
598 |
|
|
|
599 |
|
|
|
600 |
|
|
static int |
601 |
|
|
aposcmp(avp1, avp2) /* compare ambient value positions */ |
602 |
|
|
AMBVAL **avp1, **avp2; |
603 |
|
|
{ |
604 |
|
|
return(*avp1 - *avp2); |
605 |
|
|
} |
606 |
|
|
|
607 |
|
|
|
608 |
greg |
2.39 |
#if 1 |
609 |
greg |
2.27 |
static int |
610 |
|
|
avlmemi(avaddr) /* find list position from address */ |
611 |
|
|
AMBVAL *avaddr; |
612 |
|
|
{ |
613 |
|
|
register AMBVAL **avlpp; |
614 |
|
|
|
615 |
|
|
avlpp = (AMBVAL **)bsearch((char *)&avaddr, (char *)avlist2, |
616 |
|
|
nambvals, sizeof(AMBVAL *), aposcmp); |
617 |
|
|
if (avlpp == NULL) |
618 |
|
|
error(CONSISTENCY, "address not found in avlmemi"); |
619 |
|
|
return(avlpp - avlist2); |
620 |
|
|
} |
621 |
|
|
#else |
622 |
|
|
#define avlmemi(avaddr) ((AMBVAL **)bsearch((char *)&avaddr,(char *)avlist2, \ |
623 |
|
|
nambvals,sizeof(AMBVAL *),aposcmp) - avlist2) |
624 |
|
|
#endif |
625 |
|
|
|
626 |
|
|
|
627 |
greg |
2.26 |
static |
628 |
|
|
sortambvals(always) /* resort ambient values */ |
629 |
|
|
int always; |
630 |
|
|
{ |
631 |
|
|
AMBTREE oldatrunk; |
632 |
|
|
AMBVAL tav, *tap, *pnext; |
633 |
|
|
register int i, j; |
634 |
greg |
2.28 |
/* see if it's time yet */ |
635 |
greg |
2.40 |
if (!always && (ambclock++ < lastsort+sortintvl || |
636 |
greg |
2.28 |
nambvals < SORT_THRESH)) |
637 |
|
|
return; |
638 |
greg |
2.26 |
/* |
639 |
|
|
* The idea here is to minimize memory thrashing |
640 |
|
|
* in VM systems by improving reference locality. |
641 |
|
|
* We do this by periodically sorting our stored ambient |
642 |
|
|
* values in memory in order of most recently to least |
643 |
|
|
* recently accessed. This ordering was chosen so that new |
644 |
|
|
* ambient values (which tend to be less important) go into |
645 |
|
|
* higher memory with the infrequently accessed values. |
646 |
|
|
* Since we expect our values to need sorting less |
647 |
|
|
* frequently as the process continues, we double our |
648 |
|
|
* waiting interval after each call. |
649 |
|
|
* This routine is also called by setambacc() with |
650 |
|
|
* the "always" parameter set to 1 so that the ambient |
651 |
|
|
* tree will be rebuilt with the new accuracy parameter. |
652 |
|
|
*/ |
653 |
greg |
2.27 |
if (tracktime) { /* allocate pointer arrays to sort */ |
654 |
greg |
2.26 |
avlist2 = (AMBVAL **)malloc(nambvals*sizeof(AMBVAL *)); |
655 |
greg |
2.39 |
avlist1 = (struct avl *)malloc(nambvals*sizeof(struct avl)); |
656 |
|
|
} else { |
657 |
|
|
avlist2 = NULL; |
658 |
|
|
avlist1 = NULL; |
659 |
|
|
} |
660 |
|
|
if (avlist1 == NULL) { /* no time tracking -- rebuild tree? */ |
661 |
|
|
if (avlist2 != NULL) |
662 |
|
|
free((char *)avlist2); |
663 |
greg |
2.27 |
if (always) { /* rebuild without sorting */ |
664 |
|
|
copystruct(&oldatrunk, &atrunk); |
665 |
|
|
atrunk.alist = NULL; |
666 |
|
|
atrunk.kid = NULL; |
667 |
|
|
unloadatree(&oldatrunk, avinsert); |
668 |
|
|
} |
669 |
greg |
2.26 |
} else { /* sort memory by last access time */ |
670 |
|
|
/* |
671 |
|
|
* Sorting memory is tricky because it isn't contiguous. |
672 |
|
|
* We have to sort an array of pointers by MRA and also |
673 |
|
|
* by memory position. We then copy values in "loops" |
674 |
|
|
* to minimize memory hits. Nevertheless, we will visit |
675 |
greg |
2.27 |
* everyone at least twice, and this is an expensive process |
676 |
greg |
2.26 |
* when we're thrashing, which is when we need to do it. |
677 |
|
|
*/ |
678 |
greg |
2.27 |
#ifdef DEBUG |
679 |
greg |
2.29 |
sprintf(errmsg, "sorting %u ambient values at ambclock=%lu...", |
680 |
|
|
nambvals, ambclock); |
681 |
greg |
2.27 |
eputs(errmsg); |
682 |
|
|
#endif |
683 |
|
|
i_avlist = 0; |
684 |
|
|
unloadatree(&atrunk, av2list); /* empty current tree */ |
685 |
|
|
#ifdef DEBUG |
686 |
|
|
if (i_avlist < nambvals) |
687 |
|
|
error(CONSISTENCY, "missing ambient values in sortambvals"); |
688 |
|
|
#endif |
689 |
greg |
2.39 |
qsort((char *)avlist1, nambvals, sizeof(struct avl), alatcmp); |
690 |
greg |
2.26 |
qsort((char *)avlist2, nambvals, sizeof(AMBVAL *), aposcmp); |
691 |
|
|
for (i = 0; i < nambvals; i++) { |
692 |
greg |
2.39 |
if (avlist1[i].p == NULL) |
693 |
greg |
2.26 |
continue; |
694 |
|
|
tap = avlist2[i]; |
695 |
|
|
copystruct(&tav, tap); |
696 |
greg |
2.39 |
for (j = i; (pnext = avlist1[j].p) != tap; |
697 |
greg |
2.27 |
j = avlmemi(pnext)) { |
698 |
greg |
2.26 |
copystruct(avlist2[j], pnext); |
699 |
|
|
avinsert(avlist2[j]); |
700 |
greg |
2.39 |
avlist1[j].p = NULL; |
701 |
greg |
2.26 |
} |
702 |
|
|
copystruct(avlist2[j], &tav); |
703 |
|
|
avinsert(avlist2[j]); |
704 |
greg |
2.39 |
avlist1[j].p = NULL; |
705 |
greg |
2.26 |
} |
706 |
|
|
free((char *)avlist1); |
707 |
|
|
free((char *)avlist2); |
708 |
greg |
2.28 |
/* compute new sort interval */ |
709 |
|
|
sortintvl = ambclock - lastsort; |
710 |
greg |
2.32 |
if (sortintvl >= MAX_SORT_INTVL/2) |
711 |
greg |
2.28 |
sortintvl = MAX_SORT_INTVL; |
712 |
|
|
else |
713 |
greg |
2.26 |
sortintvl <<= 1; /* wait twice as long next */ |
714 |
greg |
2.27 |
#ifdef DEBUG |
715 |
|
|
eputs("done\n"); |
716 |
|
|
#endif |
717 |
greg |
2.26 |
} |
718 |
|
|
if (ambclock >= MAXACLOCK) |
719 |
|
|
ambclock = MAXACLOCK/2; |
720 |
|
|
lastsort = ambclock; |
721 |
greg |
2.20 |
} |
722 |
|
|
|
723 |
|
|
|
724 |
greg |
2.18 |
#ifdef F_SETLKW |
725 |
greg |
2.10 |
|
726 |
greg |
2.19 |
static |
727 |
|
|
aflock(typ) /* lock/unlock ambient file */ |
728 |
|
|
int typ; |
729 |
|
|
{ |
730 |
|
|
static struct flock fls; /* static so initialized to zeroes */ |
731 |
|
|
|
732 |
|
|
fls.l_type = typ; |
733 |
|
|
if (fcntl(fileno(ambfp), F_SETLKW, &fls) < 0) |
734 |
|
|
error(SYSTEM, "cannot (un)lock ambient file"); |
735 |
|
|
} |
736 |
|
|
|
737 |
|
|
|
738 |
greg |
2.16 |
int |
739 |
greg |
2.7 |
ambsync() /* synchronize ambient file */ |
740 |
|
|
{ |
741 |
|
|
static FILE *ambinp = NULL; |
742 |
greg |
2.15 |
static long lastpos = -1; |
743 |
|
|
long flen; |
744 |
greg |
2.12 |
AMBVAL avs; |
745 |
greg |
2.7 |
register int n; |
746 |
greg |
2.16 |
|
747 |
|
|
if (nunflshed == 0) |
748 |
|
|
return(0); |
749 |
greg |
2.19 |
if (lastpos < 0) /* initializing (locked in initambfile) */ |
750 |
|
|
goto syncend; |
751 |
greg |
2.7 |
/* gain exclusive access */ |
752 |
greg |
2.19 |
aflock(F_WRLCK); |
753 |
greg |
2.7 |
/* see if file has grown */ |
754 |
greg |
2.15 |
if ((flen = lseek(fileno(ambfp), 0L, 2)) < 0) |
755 |
greg |
2.21 |
goto seekerr; |
756 |
greg |
2.15 |
if (n = flen - lastpos) { /* file has grown */ |
757 |
greg |
2.17 |
if (ambinp == NULL) { /* use duplicate filedes */ |
758 |
|
|
ambinp = fdopen(dup(fileno(ambfp)), "r"); |
759 |
greg |
2.14 |
if (ambinp == NULL) |
760 |
greg |
2.17 |
error(SYSTEM, "fdopen failed in ambsync"); |
761 |
greg |
2.14 |
} |
762 |
greg |
2.15 |
if (fseek(ambinp, lastpos, 0) < 0) |
763 |
greg |
2.21 |
goto seekerr; |
764 |
greg |
2.15 |
while (n >= AMBVALSIZ) { /* load contributed values */ |
765 |
greg |
2.37 |
if (!readambval(&avs, ambinp)) { |
766 |
|
|
sprintf(errmsg, |
767 |
|
|
"ambient file corrupted near character %ld", |
768 |
|
|
flen - n); |
769 |
|
|
error(WARNING, errmsg); |
770 |
|
|
break; |
771 |
|
|
} |
772 |
greg |
2.21 |
avinsert(avstore(&avs)); |
773 |
greg |
2.15 |
n -= AMBVALSIZ; |
774 |
|
|
} |
775 |
greg |
2.22 |
/*** seek always as safety measure |
776 |
|
|
if (n) ***/ /* alignment */ |
777 |
greg |
2.21 |
if (lseek(fileno(ambfp), flen-n, 0) < 0) |
778 |
|
|
goto seekerr; |
779 |
greg |
2.7 |
} |
780 |
greg |
2.21 |
#ifdef DEBUG |
781 |
|
|
if (ambfp->_ptr - ambfp->_base != nunflshed*AMBVALSIZ) { |
782 |
|
|
sprintf(errmsg, "ambient file buffer at %d rather than %d", |
783 |
|
|
ambfp->_ptr - ambfp->_base, |
784 |
|
|
nunflshed*AMBVALSIZ); |
785 |
|
|
error(CONSISTENCY, errmsg); |
786 |
|
|
} |
787 |
|
|
#endif |
788 |
greg |
2.15 |
syncend: |
789 |
greg |
2.7 |
n = fflush(ambfp); /* calls write() at last */ |
790 |
greg |
2.21 |
if ((lastpos = lseek(fileno(ambfp), 0L, 1)) < 0) |
791 |
|
|
goto seekerr; |
792 |
greg |
2.19 |
aflock(F_UNLCK); /* release file */ |
793 |
greg |
2.16 |
nunflshed = 0; |
794 |
greg |
2.7 |
return(n); |
795 |
greg |
2.21 |
seekerr: |
796 |
|
|
error(SYSTEM, "seek failed in ambsync"); |
797 |
greg |
2.18 |
} |
798 |
|
|
|
799 |
|
|
#else |
800 |
|
|
|
801 |
|
|
int |
802 |
|
|
ambsync() /* flush ambient file */ |
803 |
|
|
{ |
804 |
|
|
if (nunflshed == 0) |
805 |
|
|
return(0); |
806 |
|
|
nunflshed = 0; |
807 |
|
|
return(fflush(ambfp)); |
808 |
greg |
1.1 |
} |
809 |
greg |
2.10 |
|
810 |
|
|
#endif |