1 |
greg |
2.15 |
/* Copyright (c) 1993 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 |
2.12 |
#define OCTSCALE 0.5 /* ceil((valid rad.)/(cube size)) */ |
22 |
greg |
1.1 |
|
23 |
greg |
1.14 |
typedef struct ambtree { |
24 |
greg |
2.12 |
AMBVAL *alist; /* ambient value list */ |
25 |
|
|
struct ambtree *kid; /* 8 child nodes */ |
26 |
greg |
1.14 |
} AMBTREE; /* ambient octree */ |
27 |
|
|
|
28 |
greg |
1.1 |
extern CUBE thescene; /* contains space boundaries */ |
29 |
|
|
|
30 |
greg |
2.26 |
extern char *shm_boundary; /* shared memory boundary */ |
31 |
|
|
|
32 |
greg |
2.12 |
#define MAXASET 511 /* maximum number of elements in ambient set */ |
33 |
|
|
OBJECT ambset[MAXASET+1]={0}; /* ambient include/exclude set */ |
34 |
greg |
1.1 |
|
35 |
greg |
2.12 |
double maxarad; /* maximum ambient radius */ |
36 |
|
|
double minarad; /* minimum ambient radius */ |
37 |
greg |
1.1 |
|
38 |
greg |
2.12 |
static AMBTREE atrunk; /* our ambient trunk node */ |
39 |
greg |
1.1 |
|
40 |
|
|
static FILE *ambfp = NULL; /* ambient file pointer */ |
41 |
greg |
2.16 |
static int nunflshed = 0; /* number of unflushed ambient values */ |
42 |
greg |
1.1 |
|
43 |
greg |
2.26 |
#ifndef SORT_THRESH |
44 |
|
|
#ifdef BIGMEM |
45 |
|
|
#define SORT_THRESH (6*(1L<<20)/sizeof(AMBVAL)) |
46 |
|
|
#else |
47 |
|
|
#define SORT_THRESH (2*(1L<<20)/sizeof(AMBVAL)) |
48 |
|
|
#endif |
49 |
|
|
#endif |
50 |
|
|
#ifndef SORT_INTVL |
51 |
|
|
#define SORT_INTVL (SORT_THRESH*2) |
52 |
|
|
#endif |
53 |
|
|
|
54 |
|
|
static long ambclock = 0; /* ambient access clock */ |
55 |
|
|
static int nambvals = 0; /* number of stored ambient values */ |
56 |
|
|
static long lastsort = 0; /* time of last value sort */ |
57 |
|
|
static long sortintvl = SORT_INTVL; /* time until next sort */ |
58 |
|
|
|
59 |
|
|
#define MAXACLOCK (1L<<30) /* clock turnover value */ |
60 |
|
|
#define tracktime (shm_boundary == NULL || ambfp == NULL) |
61 |
|
|
#define need2sort (ambclock > lastsort+sortintvl && \ |
62 |
|
|
nambvals > SORT_THRESH) |
63 |
|
|
|
64 |
greg |
2.12 |
#define AMBFLUSH (BUFSIZ/AMBVALSIZ) |
65 |
greg |
2.6 |
|
66 |
greg |
2.12 |
#define newambval() (AMBVAL *)bmalloc(sizeof(AMBVAL)) |
67 |
greg |
1.1 |
|
68 |
greg |
2.7 |
extern long ftell(), lseek(); |
69 |
greg |
2.26 |
static int initambfile(), avsave(), avinsert(), sortambvals(); |
70 |
greg |
2.20 |
static AMBVAL *avstore(); |
71 |
greg |
2.19 |
#ifdef F_SETLKW |
72 |
|
|
static aflock(); |
73 |
|
|
#endif |
74 |
greg |
1.1 |
|
75 |
greg |
2.7 |
|
76 |
greg |
2.3 |
setambres(ar) /* set ambient resolution */ |
77 |
|
|
int ar; |
78 |
|
|
{ |
79 |
greg |
2.21 |
ambres = ar < 0 ? 0 : ar; /* may be done already */ |
80 |
greg |
2.3 |
/* set min & max radii */ |
81 |
|
|
if (ar <= 0) { |
82 |
greg |
2.25 |
minarad = 0; |
83 |
greg |
2.3 |
maxarad = thescene.cusize / 2.0; |
84 |
|
|
} else { |
85 |
|
|
minarad = thescene.cusize / ar; |
86 |
greg |
2.25 |
maxarad = 16 * minarad; /* heuristic */ |
87 |
greg |
2.3 |
if (maxarad > thescene.cusize / 2.0) |
88 |
|
|
maxarad = thescene.cusize / 2.0; |
89 |
|
|
} |
90 |
greg |
2.25 |
if (minarad <= FTINY) |
91 |
|
|
minarad = 10*FTINY; |
92 |
|
|
if (maxarad <= minarad) |
93 |
|
|
maxarad = 64 * minarad; |
94 |
greg |
2.3 |
} |
95 |
|
|
|
96 |
|
|
|
97 |
greg |
2.21 |
setambacc(newa) /* set ambient accuracy */ |
98 |
greg |
2.20 |
double newa; |
99 |
|
|
{ |
100 |
greg |
2.21 |
static double oldambacc = -1.0; |
101 |
greg |
2.20 |
|
102 |
greg |
2.21 |
ambacc = newa < 0.0 ? 0.0 : newa; /* may be done already */ |
103 |
|
|
if (oldambacc < -FTINY) |
104 |
|
|
oldambacc = ambacc; /* do nothing first call */ |
105 |
|
|
if (fabs(newa - oldambacc) < 0.01) |
106 |
greg |
2.20 |
return; /* insignificant -- don't bother */ |
107 |
|
|
if (ambacc <= FTINY) |
108 |
|
|
return; /* cannot build new tree */ |
109 |
|
|
/* else need to rebuild tree */ |
110 |
greg |
2.26 |
sortambvals(1); |
111 |
greg |
2.21 |
oldambacc = ambacc; /* remeber setting for next call */ |
112 |
greg |
2.20 |
} |
113 |
|
|
|
114 |
|
|
|
115 |
greg |
1.1 |
setambient(afile) /* initialize calculation */ |
116 |
|
|
char *afile; |
117 |
|
|
{ |
118 |
greg |
2.9 |
long headlen; |
119 |
greg |
2.12 |
AMBVAL amb; |
120 |
greg |
2.3 |
/* init ambient limits */ |
121 |
|
|
setambres(ambres); |
122 |
greg |
2.21 |
setambacc(ambacc); |
123 |
greg |
2.19 |
if (afile == NULL) |
124 |
|
|
return; |
125 |
greg |
2.20 |
if (ambacc <= FTINY) { |
126 |
greg |
2.21 |
sprintf(errmsg, "zero ambient accuracy so \"%s\" not opened", |
127 |
greg |
2.20 |
afile); |
128 |
|
|
error(WARNING, errmsg); |
129 |
|
|
return; |
130 |
|
|
} |
131 |
greg |
2.3 |
/* open ambient file */ |
132 |
greg |
2.19 |
if ((ambfp = fopen(afile, "r+")) != NULL) { |
133 |
|
|
initambfile(0); |
134 |
|
|
headlen = ftell(ambfp); |
135 |
|
|
while (readambval(&amb, ambfp)) |
136 |
greg |
2.21 |
avinsert(avstore(&amb)); |
137 |
greg |
2.19 |
/* align */ |
138 |
|
|
fseek(ambfp, -((ftell(ambfp)-headlen)%AMBVALSIZ), 1); |
139 |
|
|
} else if ((ambfp = fopen(afile, "w+")) != NULL) |
140 |
|
|
initambfile(1); |
141 |
|
|
else { |
142 |
|
|
sprintf(errmsg, "cannot open ambient file \"%s\"", afile); |
143 |
|
|
error(SYSTEM, errmsg); |
144 |
greg |
2.16 |
} |
145 |
greg |
2.19 |
nunflshed++; /* lie */ |
146 |
|
|
ambsync(); |
147 |
greg |
1.8 |
} |
148 |
|
|
|
149 |
|
|
|
150 |
|
|
ambnotify(obj) /* record new modifier */ |
151 |
greg |
2.12 |
OBJECT obj; |
152 |
greg |
1.8 |
{ |
153 |
greg |
1.11 |
static int hitlimit = 0; |
154 |
greg |
2.12 |
register OBJREC *o = objptr(obj); |
155 |
greg |
1.8 |
register char **amblp; |
156 |
|
|
|
157 |
greg |
1.11 |
if (hitlimit || !ismodifier(o->otype)) |
158 |
greg |
1.8 |
return; |
159 |
|
|
for (amblp = amblist; *amblp != NULL; amblp++) |
160 |
|
|
if (!strcmp(o->oname, *amblp)) { |
161 |
greg |
1.11 |
if (ambset[0] >= MAXASET) { |
162 |
|
|
error(WARNING, "too many modifiers in ambient list"); |
163 |
|
|
hitlimit++; |
164 |
|
|
return; /* should this be fatal? */ |
165 |
|
|
} |
166 |
greg |
1.8 |
insertelem(ambset, obj); |
167 |
|
|
return; |
168 |
greg |
1.1 |
} |
169 |
|
|
} |
170 |
|
|
|
171 |
|
|
|
172 |
|
|
ambient(acol, r) /* compute ambient component for ray */ |
173 |
|
|
COLOR acol; |
174 |
|
|
register RAY *r; |
175 |
|
|
{ |
176 |
|
|
static int rdepth = 0; /* ambient recursion */ |
177 |
greg |
2.12 |
double d; |
178 |
greg |
1.1 |
|
179 |
|
|
if (ambdiv <= 0) /* no ambient calculation */ |
180 |
|
|
goto dumbamb; |
181 |
|
|
/* check number of bounces */ |
182 |
greg |
1.16 |
if (rdepth >= ambounce) |
183 |
greg |
1.1 |
goto dumbamb; |
184 |
|
|
/* check ambient list */ |
185 |
|
|
if (ambincl != -1 && r->ro != NULL && |
186 |
|
|
ambincl != inset(ambset, r->ro->omod)) |
187 |
|
|
goto dumbamb; |
188 |
|
|
|
189 |
|
|
if (ambacc <= FTINY) { /* no ambient storage */ |
190 |
greg |
1.16 |
rdepth++; |
191 |
|
|
d = doambient(acol, r, r->rweight, NULL, NULL); |
192 |
|
|
rdepth--; |
193 |
|
|
if (d == 0.0) |
194 |
greg |
1.1 |
goto dumbamb; |
195 |
greg |
1.16 |
return; |
196 |
greg |
1.1 |
} |
197 |
|
|
/* get ambient value */ |
198 |
greg |
2.26 |
if (need2sort) |
199 |
|
|
sortambvals(0); |
200 |
greg |
1.1 |
setcolor(acol, 0.0, 0.0, 0.0); |
201 |
greg |
1.16 |
d = sumambient(acol, r, rdepth, |
202 |
|
|
&atrunk, thescene.cuorg, thescene.cusize); |
203 |
|
|
if (d > FTINY) |
204 |
|
|
scalecolor(acol, 1.0/d); |
205 |
|
|
else { |
206 |
|
|
d = makeambient(acol, r, rdepth++); |
207 |
|
|
rdepth--; |
208 |
|
|
} |
209 |
|
|
if (d > FTINY) |
210 |
|
|
return; |
211 |
greg |
1.1 |
dumbamb: /* return global value */ |
212 |
|
|
copycolor(acol, ambval); |
213 |
|
|
} |
214 |
|
|
|
215 |
|
|
|
216 |
|
|
double |
217 |
greg |
1.16 |
sumambient(acol, r, al, at, c0, s) /* get interpolated ambient value */ |
218 |
greg |
1.1 |
COLOR acol; |
219 |
|
|
register RAY *r; |
220 |
greg |
1.16 |
int al; |
221 |
greg |
2.12 |
AMBTREE *at; |
222 |
greg |
1.1 |
FVECT c0; |
223 |
greg |
2.12 |
double s; |
224 |
greg |
1.1 |
{ |
225 |
greg |
2.12 |
double d, e1, e2, wt, wsum; |
226 |
greg |
1.1 |
COLOR ct; |
227 |
|
|
FVECT ck0; |
228 |
|
|
int i; |
229 |
|
|
register int j; |
230 |
greg |
2.12 |
register AMBVAL *av; |
231 |
greg |
1.7 |
/* do this node */ |
232 |
greg |
1.1 |
wsum = 0.0; |
233 |
|
|
for (av = at->alist; av != NULL; av = av->next) { |
234 |
greg |
2.26 |
if (tracktime) |
235 |
|
|
av->latick = ambclock++; |
236 |
greg |
1.1 |
/* |
237 |
greg |
1.16 |
* Ambient level test. |
238 |
greg |
1.1 |
*/ |
239 |
greg |
2.23 |
if (av->lvl > al) /* list sorted, so this works */ |
240 |
|
|
break; |
241 |
|
|
if (av->weight < r->rweight-FTINY) |
242 |
greg |
1.1 |
continue; |
243 |
|
|
/* |
244 |
|
|
* Ambient radius test. |
245 |
|
|
*/ |
246 |
|
|
e1 = 0.0; |
247 |
|
|
for (j = 0; j < 3; j++) { |
248 |
|
|
d = av->pos[j] - r->rop[j]; |
249 |
|
|
e1 += d * d; |
250 |
|
|
} |
251 |
|
|
e1 /= av->rad * av->rad; |
252 |
|
|
if (e1 > ambacc*ambacc*1.21) |
253 |
|
|
continue; |
254 |
|
|
/* |
255 |
|
|
* Normal direction test. |
256 |
|
|
*/ |
257 |
|
|
e2 = (1.0 - DOT(av->dir, r->ron)) * r->rweight; |
258 |
|
|
if (e2 < 0.0) e2 = 0.0; |
259 |
|
|
if (e1 + e2 > ambacc*ambacc*1.21) |
260 |
|
|
continue; |
261 |
|
|
/* |
262 |
|
|
* Ray behind test. |
263 |
|
|
*/ |
264 |
|
|
d = 0.0; |
265 |
|
|
for (j = 0; j < 3; j++) |
266 |
|
|
d += (r->rop[j] - av->pos[j]) * |
267 |
|
|
(av->dir[j] + r->ron[j]); |
268 |
greg |
1.18 |
if (d*0.5 < -minarad*ambacc-.001) |
269 |
greg |
1.1 |
continue; |
270 |
|
|
/* |
271 |
|
|
* Jittering final test reduces image artifacts. |
272 |
|
|
*/ |
273 |
|
|
wt = sqrt(e1) + sqrt(e2); |
274 |
greg |
2.2 |
wt *= .9 + .2*urand(9015+samplendx); |
275 |
greg |
1.6 |
if (wt > ambacc) |
276 |
greg |
1.1 |
continue; |
277 |
|
|
if (wt <= 1e-3) |
278 |
|
|
wt = 1e3; |
279 |
|
|
else |
280 |
|
|
wt = 1.0 / wt; |
281 |
|
|
wsum += wt; |
282 |
greg |
1.15 |
extambient(ct, av, r->rop, r->ron); |
283 |
greg |
1.1 |
scalecolor(ct, wt); |
284 |
|
|
addcolor(acol, ct); |
285 |
greg |
1.7 |
} |
286 |
|
|
if (at->kid == NULL) |
287 |
|
|
return(wsum); |
288 |
|
|
/* do children */ |
289 |
|
|
s *= 0.5; |
290 |
|
|
for (i = 0; i < 8; i++) { |
291 |
|
|
for (j = 0; j < 3; j++) { |
292 |
|
|
ck0[j] = c0[j]; |
293 |
|
|
if (1<<j & i) |
294 |
|
|
ck0[j] += s; |
295 |
|
|
if (r->rop[j] < ck0[j] - OCTSCALE*s) |
296 |
|
|
break; |
297 |
|
|
if (r->rop[j] > ck0[j] + (1.0+OCTSCALE)*s) |
298 |
|
|
break; |
299 |
|
|
} |
300 |
|
|
if (j == 3) |
301 |
greg |
1.16 |
wsum += sumambient(acol, r, al, at->kid+i, ck0, s); |
302 |
greg |
1.1 |
} |
303 |
|
|
return(wsum); |
304 |
|
|
} |
305 |
|
|
|
306 |
|
|
|
307 |
|
|
double |
308 |
greg |
1.16 |
makeambient(acol, r, al) /* make a new ambient value */ |
309 |
greg |
1.1 |
COLOR acol; |
310 |
|
|
register RAY *r; |
311 |
greg |
1.16 |
int al; |
312 |
greg |
1.1 |
{ |
313 |
greg |
2.12 |
AMBVAL amb; |
314 |
greg |
1.14 |
FVECT gp, gd; |
315 |
greg |
1.16 |
/* compute weight */ |
316 |
|
|
amb.weight = pow(AVGREFL, (double)al); |
317 |
greg |
1.17 |
if (r->rweight < 0.2*amb.weight) /* heuristic */ |
318 |
greg |
1.16 |
amb.weight = r->rweight; |
319 |
|
|
/* compute ambient */ |
320 |
|
|
amb.rad = doambient(acol, r, amb.weight, gp, gd); |
321 |
greg |
1.1 |
if (amb.rad == 0.0) |
322 |
|
|
return(0.0); |
323 |
|
|
/* store it */ |
324 |
|
|
VCOPY(amb.pos, r->rop); |
325 |
|
|
VCOPY(amb.dir, r->ron); |
326 |
greg |
1.16 |
amb.lvl = al; |
327 |
greg |
1.1 |
copycolor(amb.val, acol); |
328 |
greg |
1.14 |
VCOPY(amb.gpos, gp); |
329 |
|
|
VCOPY(amb.gdir, gd); |
330 |
greg |
1.1 |
/* insert into tree */ |
331 |
greg |
2.7 |
avsave(&amb); /* and save to file */ |
332 |
greg |
1.1 |
return(amb.rad); |
333 |
greg |
1.15 |
} |
334 |
|
|
|
335 |
|
|
|
336 |
|
|
extambient(cr, ap, pv, nv) /* extrapolate value at pv, nv */ |
337 |
|
|
COLOR cr; |
338 |
greg |
2.12 |
register AMBVAL *ap; |
339 |
greg |
1.15 |
FVECT pv, nv; |
340 |
|
|
{ |
341 |
|
|
FVECT v1, v2; |
342 |
|
|
register int i; |
343 |
greg |
2.12 |
double d; |
344 |
greg |
1.15 |
|
345 |
|
|
d = 1.0; /* zeroeth order */ |
346 |
|
|
/* gradient due to translation */ |
347 |
|
|
for (i = 0; i < 3; i++) |
348 |
|
|
d += ap->gpos[i]*(pv[i]-ap->pos[i]); |
349 |
|
|
/* gradient due to rotation */ |
350 |
|
|
VCOPY(v1, ap->dir); |
351 |
|
|
fcross(v2, v1, nv); |
352 |
|
|
d += DOT(ap->gdir, v2); |
353 |
|
|
if (d <= 0.0) { |
354 |
|
|
setcolor(cr, 0.0, 0.0, 0.0); |
355 |
|
|
return; |
356 |
|
|
} |
357 |
|
|
copycolor(cr, ap->val); |
358 |
|
|
scalecolor(cr, d); |
359 |
greg |
1.1 |
} |
360 |
|
|
|
361 |
|
|
|
362 |
|
|
static |
363 |
greg |
2.9 |
initambfile(creat) /* initialize ambient file */ |
364 |
|
|
int creat; |
365 |
|
|
{ |
366 |
|
|
extern char *progname, *octname, VersionID[]; |
367 |
|
|
|
368 |
greg |
2.19 |
#ifdef F_SETLKW |
369 |
|
|
aflock(creat ? F_WRLCK : F_RDLCK); |
370 |
|
|
#endif |
371 |
greg |
2.12 |
#ifdef MSDOS |
372 |
|
|
setmode(fileno(ambfp), O_BINARY); |
373 |
|
|
#endif |
374 |
greg |
2.21 |
setbuf(ambfp, bmalloc(BUFSIZ+8)); |
375 |
greg |
2.9 |
if (creat) { /* new file */ |
376 |
greg |
2.24 |
newheader("RADIANCE", ambfp); |
377 |
greg |
2.9 |
fprintf(ambfp, "%s -av %g %g %g -ab %d -aa %g ", |
378 |
|
|
progname, colval(ambval,RED), |
379 |
|
|
colval(ambval,GRN), colval(ambval,BLU), |
380 |
|
|
ambounce, ambacc); |
381 |
|
|
fprintf(ambfp, "-ad %d -as %d -ar %d %s\n", |
382 |
|
|
ambdiv, ambssamp, ambres, |
383 |
|
|
octname==NULL ? "" : octname); |
384 |
|
|
fprintf(ambfp, "SOFTWARE= %s\n", VersionID); |
385 |
|
|
fputformat(AMBFMT, ambfp); |
386 |
|
|
putc('\n', ambfp); |
387 |
|
|
putambmagic(ambfp); |
388 |
greg |
2.17 |
} else if (checkheader(ambfp, AMBFMT, NULL) < 0 || !hasambmagic(ambfp)) |
389 |
|
|
error(USER, "bad ambient file"); |
390 |
greg |
2.9 |
} |
391 |
|
|
|
392 |
|
|
|
393 |
|
|
static |
394 |
greg |
2.7 |
avsave(av) /* insert and save an ambient value */ |
395 |
greg |
2.12 |
AMBVAL *av; |
396 |
greg |
1.1 |
{ |
397 |
greg |
2.21 |
avinsert(avstore(av)); |
398 |
greg |
1.1 |
if (ambfp == NULL) |
399 |
|
|
return; |
400 |
greg |
2.5 |
if (writambval(av, ambfp) < 0) |
401 |
greg |
1.1 |
goto writerr; |
402 |
greg |
2.16 |
if (++nunflshed >= AMBFLUSH) |
403 |
greg |
2.7 |
if (ambsync() == EOF) |
404 |
greg |
1.1 |
goto writerr; |
405 |
|
|
return; |
406 |
|
|
writerr: |
407 |
greg |
2.17 |
error(SYSTEM, "error writing ambient file"); |
408 |
greg |
1.1 |
} |
409 |
|
|
|
410 |
|
|
|
411 |
greg |
2.20 |
static AMBVAL * |
412 |
|
|
avstore(aval) /* allocate memory and store aval */ |
413 |
|
|
register AMBVAL *aval; |
414 |
|
|
{ |
415 |
|
|
register AMBVAL *av; |
416 |
|
|
|
417 |
|
|
if ((av = newambval()) == NULL) |
418 |
|
|
error(SYSTEM, "out of memory in avstore"); |
419 |
|
|
copystruct(av, aval); |
420 |
greg |
2.26 |
av->latick = ambclock; |
421 |
|
|
av->next = NULL; |
422 |
|
|
nambvals++; |
423 |
greg |
2.20 |
return(av); |
424 |
|
|
} |
425 |
|
|
|
426 |
|
|
|
427 |
greg |
2.26 |
#define ATALLOCSZ 512 /* #/8 trees to allocate at once */ |
428 |
|
|
|
429 |
|
|
static AMBTREE *atfreelist = NULL; /* free ambient tree structures */ |
430 |
|
|
|
431 |
|
|
|
432 |
greg |
1.1 |
static |
433 |
greg |
2.26 |
AMBTREE * |
434 |
|
|
newambtree() /* allocate 8 ambient tree structs */ |
435 |
|
|
{ |
436 |
|
|
register AMBTREE *atp, *upperlim; |
437 |
|
|
|
438 |
|
|
if (atfreelist == NULL) { /* get more nodes */ |
439 |
|
|
atfreelist = (AMBTREE *)bmalloc(ATALLOCSZ*8*sizeof(AMBTREE)); |
440 |
|
|
if (atfreelist == NULL) |
441 |
|
|
return(NULL); |
442 |
|
|
/* link new free list */ |
443 |
|
|
upperlim = atfreelist + 8*(ATALLOCSZ-1); |
444 |
|
|
for (atp = atfreelist; atp < upperlim; atp += 8) |
445 |
|
|
atp->kid = atp + 8; |
446 |
|
|
atp->kid = NULL; |
447 |
|
|
} |
448 |
|
|
atp = atfreelist; |
449 |
|
|
atfreelist = atp->kid; |
450 |
|
|
bzero((char *)atp, 8*sizeof(AMBTREE)); |
451 |
|
|
return(atp); |
452 |
|
|
} |
453 |
|
|
|
454 |
|
|
|
455 |
|
|
static |
456 |
|
|
freeambtree(atp) /* free 8 ambient tree structs */ |
457 |
|
|
AMBTREE *atp; |
458 |
|
|
{ |
459 |
|
|
atp->kid = atfreelist; |
460 |
|
|
atfreelist = atp; |
461 |
|
|
} |
462 |
|
|
|
463 |
|
|
|
464 |
|
|
static |
465 |
greg |
2.21 |
avinsert(av) /* insert ambient value in our tree */ |
466 |
greg |
2.20 |
register AMBVAL *av; |
467 |
greg |
1.1 |
{ |
468 |
greg |
2.21 |
register AMBTREE *at; |
469 |
greg |
2.23 |
register AMBVAL *ap; |
470 |
|
|
AMBVAL avh; |
471 |
greg |
1.1 |
FVECT ck0; |
472 |
greg |
2.21 |
double s; |
473 |
greg |
1.1 |
int branch; |
474 |
|
|
register int i; |
475 |
|
|
|
476 |
greg |
2.20 |
if (av->rad <= FTINY) |
477 |
|
|
error(CONSISTENCY, "zero ambient radius in avinsert"); |
478 |
greg |
2.21 |
at = &atrunk; |
479 |
|
|
VCOPY(ck0, thescene.cuorg); |
480 |
|
|
s = thescene.cusize; |
481 |
greg |
1.1 |
while (s*(OCTSCALE/2) > av->rad*ambacc) { |
482 |
|
|
if (at->kid == NULL) |
483 |
|
|
if ((at->kid = newambtree()) == NULL) |
484 |
greg |
2.20 |
error(SYSTEM, "out of memory in avinsert"); |
485 |
greg |
1.1 |
s *= 0.5; |
486 |
|
|
branch = 0; |
487 |
|
|
for (i = 0; i < 3; i++) |
488 |
|
|
if (av->pos[i] > ck0[i] + s) { |
489 |
|
|
ck0[i] += s; |
490 |
|
|
branch |= 1 << i; |
491 |
|
|
} |
492 |
|
|
at = at->kid + branch; |
493 |
|
|
} |
494 |
greg |
2.23 |
avh.next = at->alist; /* order by increasing level */ |
495 |
|
|
for (ap = &avh; ap->next != NULL; ap = ap->next) |
496 |
|
|
if (ap->next->lvl >= av->lvl) |
497 |
|
|
break; |
498 |
|
|
av->next = ap->next; |
499 |
|
|
ap->next = av; |
500 |
|
|
at->alist = avh.next; |
501 |
greg |
2.7 |
} |
502 |
|
|
|
503 |
|
|
|
504 |
greg |
2.20 |
static |
505 |
greg |
2.26 |
unloadatree(at, f) /* unload an ambient value tree */ |
506 |
greg |
2.20 |
register AMBTREE *at; |
507 |
greg |
2.26 |
int (*f)(); |
508 |
greg |
2.20 |
{ |
509 |
|
|
register AMBVAL *av; |
510 |
|
|
register int i; |
511 |
|
|
/* transfer values at this node */ |
512 |
|
|
for (av = at->alist; av != NULL; av = at->alist) { |
513 |
|
|
at->alist = av->next; |
514 |
greg |
2.26 |
(*f)(av); |
515 |
greg |
2.20 |
} |
516 |
greg |
2.21 |
if (at->kid == NULL) |
517 |
|
|
return; |
518 |
greg |
2.20 |
for (i = 0; i < 8; i++) /* transfer and free children */ |
519 |
greg |
2.26 |
unloadatree(at->kid+i, f); |
520 |
greg |
2.20 |
freeambtree(at->kid); |
521 |
greg |
2.26 |
at->kid = NULL; |
522 |
|
|
} |
523 |
|
|
|
524 |
|
|
|
525 |
|
|
static AMBVAL **avlist1, **avlist2; /* ambient value lists for sorting */ |
526 |
|
|
static int i_avlist; /* index for lists */ |
527 |
|
|
|
528 |
|
|
|
529 |
|
|
static |
530 |
|
|
av2list(av) |
531 |
|
|
AMBVAL *av; |
532 |
|
|
{ |
533 |
|
|
if (i_avlist >= nambvals) |
534 |
|
|
error(CONSISTENCY, "too many ambient values in av2list1"); |
535 |
|
|
avlist1[i_avlist] = avlist2[i_avlist] = av; |
536 |
|
|
i_avlist++; |
537 |
|
|
} |
538 |
|
|
|
539 |
|
|
|
540 |
|
|
static int |
541 |
|
|
alatcmp(avp1, avp2) /* compare ambient values for MRA */ |
542 |
|
|
AMBVAL **avp1, **avp2; |
543 |
|
|
{ |
544 |
|
|
return((**avp2).latick - (**avp1).latick); |
545 |
|
|
} |
546 |
|
|
|
547 |
|
|
|
548 |
|
|
static int |
549 |
|
|
aposcmp(avp1, avp2) /* compare ambient value positions */ |
550 |
|
|
AMBVAL **avp1, **avp2; |
551 |
|
|
{ |
552 |
|
|
return(*avp1 - *avp2); |
553 |
|
|
} |
554 |
|
|
|
555 |
|
|
|
556 |
|
|
static |
557 |
|
|
sortambvals(always) /* resort ambient values */ |
558 |
|
|
int always; |
559 |
|
|
{ |
560 |
|
|
AMBTREE oldatrunk; |
561 |
|
|
AMBVAL tav, *tap, *pnext; |
562 |
|
|
register int i, j; |
563 |
|
|
/* |
564 |
|
|
* The idea here is to minimize memory thrashing |
565 |
|
|
* in VM systems by improving reference locality. |
566 |
|
|
* We do this by periodically sorting our stored ambient |
567 |
|
|
* values in memory in order of most recently to least |
568 |
|
|
* recently accessed. This ordering was chosen so that new |
569 |
|
|
* ambient values (which tend to be less important) go into |
570 |
|
|
* higher memory with the infrequently accessed values. |
571 |
|
|
* Since we expect our values to need sorting less |
572 |
|
|
* frequently as the process continues, we double our |
573 |
|
|
* waiting interval after each call. |
574 |
|
|
* This routine is also called by setambacc() with |
575 |
|
|
* the "always" parameter set to 1 so that the ambient |
576 |
|
|
* tree will be rebuilt with the new accuracy parameter. |
577 |
|
|
*/ |
578 |
|
|
if (tracktime) { |
579 |
|
|
avlist1 = (AMBVAL **)malloc(nambvals*sizeof(AMBVAL *)); |
580 |
|
|
avlist2 = (AMBVAL **)malloc(nambvals*sizeof(AMBVAL *)); |
581 |
|
|
} else |
582 |
|
|
avlist1 = avlist2 = NULL; |
583 |
|
|
if (avlist2 == NULL) { /* rebuild tree? */ |
584 |
|
|
if (avlist1 != NULL) |
585 |
|
|
free((char *)avlist1); |
586 |
|
|
if (!always) |
587 |
|
|
return; |
588 |
|
|
copystruct(&oldatrunk, &atrunk); |
589 |
|
|
atrunk.alist = NULL; |
590 |
|
|
atrunk.kid = NULL; |
591 |
|
|
unloadatree(&oldatrunk, avinsert); |
592 |
|
|
} else { /* sort memory by last access time */ |
593 |
|
|
i_avlist = 0; |
594 |
|
|
unloadatree(&atrunk, av2list); /* empty current tree */ |
595 |
|
|
/* |
596 |
|
|
* Sorting memory is tricky because it isn't contiguous. |
597 |
|
|
* We have to sort an array of pointers by MRA and also |
598 |
|
|
* by memory position. We then copy values in "loops" |
599 |
|
|
* to minimize memory hits. Nevertheless, we will visit |
600 |
|
|
* everyone at least once, and this is an expensive process |
601 |
|
|
* when we're thrashing, which is when we need to do it. |
602 |
|
|
*/ |
603 |
|
|
qsort((char *)avlist1, nambvals, sizeof(AMBVAL *), alatcmp); |
604 |
|
|
qsort((char *)avlist2, nambvals, sizeof(AMBVAL *), aposcmp); |
605 |
|
|
for (i = 0; i < nambvals; i++) { |
606 |
|
|
if (avlist1[i] == NULL || avlist1[i] == avlist2[i]) |
607 |
|
|
continue; |
608 |
|
|
tap = avlist2[i]; |
609 |
|
|
copystruct(&tav, tap); |
610 |
|
|
for (j = i; (pnext = avlist1[j]) != tap; |
611 |
|
|
j = (AMBVAL **)bsearch((char *)&pnext, |
612 |
|
|
(char *)(avlist2+i),nambvals-i, |
613 |
|
|
sizeof(AMBVAL *),aposcmp) - |
614 |
|
|
avlist2) { |
615 |
|
|
copystruct(avlist2[j], pnext); |
616 |
|
|
avinsert(avlist2[j]); |
617 |
|
|
avlist1[j] = NULL; |
618 |
|
|
} |
619 |
|
|
copystruct(avlist2[j], &tav); |
620 |
|
|
avinsert(avlist2[j]); |
621 |
|
|
avlist1[j] = NULL; |
622 |
|
|
} |
623 |
|
|
free((char *)avlist1); |
624 |
|
|
free((char *)avlist2); |
625 |
|
|
if (sortintvl < MAXACLOCK/4) |
626 |
|
|
sortintvl <<= 1; /* wait twice as long next */ |
627 |
|
|
} |
628 |
|
|
if (ambclock >= MAXACLOCK) |
629 |
|
|
ambclock = MAXACLOCK/2; |
630 |
|
|
lastsort = ambclock; |
631 |
greg |
2.20 |
} |
632 |
|
|
|
633 |
|
|
|
634 |
greg |
2.18 |
#ifdef F_SETLKW |
635 |
greg |
2.10 |
|
636 |
greg |
2.19 |
static |
637 |
|
|
aflock(typ) /* lock/unlock ambient file */ |
638 |
|
|
int typ; |
639 |
|
|
{ |
640 |
|
|
static struct flock fls; /* static so initialized to zeroes */ |
641 |
|
|
|
642 |
|
|
fls.l_type = typ; |
643 |
|
|
if (fcntl(fileno(ambfp), F_SETLKW, &fls) < 0) |
644 |
|
|
error(SYSTEM, "cannot (un)lock ambient file"); |
645 |
|
|
} |
646 |
|
|
|
647 |
|
|
|
648 |
greg |
2.16 |
int |
649 |
greg |
2.7 |
ambsync() /* synchronize ambient file */ |
650 |
|
|
{ |
651 |
|
|
static FILE *ambinp = NULL; |
652 |
greg |
2.15 |
static long lastpos = -1; |
653 |
|
|
long flen; |
654 |
greg |
2.12 |
AMBVAL avs; |
655 |
greg |
2.7 |
register int n; |
656 |
greg |
2.16 |
|
657 |
|
|
if (nunflshed == 0) |
658 |
|
|
return(0); |
659 |
greg |
2.19 |
if (lastpos < 0) /* initializing (locked in initambfile) */ |
660 |
|
|
goto syncend; |
661 |
greg |
2.7 |
/* gain exclusive access */ |
662 |
greg |
2.19 |
aflock(F_WRLCK); |
663 |
greg |
2.7 |
/* see if file has grown */ |
664 |
greg |
2.15 |
if ((flen = lseek(fileno(ambfp), 0L, 2)) < 0) |
665 |
greg |
2.21 |
goto seekerr; |
666 |
greg |
2.15 |
if (n = flen - lastpos) { /* file has grown */ |
667 |
greg |
2.17 |
if (ambinp == NULL) { /* use duplicate filedes */ |
668 |
|
|
ambinp = fdopen(dup(fileno(ambfp)), "r"); |
669 |
greg |
2.14 |
if (ambinp == NULL) |
670 |
greg |
2.17 |
error(SYSTEM, "fdopen failed in ambsync"); |
671 |
greg |
2.14 |
} |
672 |
greg |
2.15 |
if (fseek(ambinp, lastpos, 0) < 0) |
673 |
greg |
2.21 |
goto seekerr; |
674 |
greg |
2.15 |
while (n >= AMBVALSIZ) { /* load contributed values */ |
675 |
greg |
2.7 |
readambval(&avs, ambinp); |
676 |
greg |
2.21 |
avinsert(avstore(&avs)); |
677 |
greg |
2.15 |
n -= AMBVALSIZ; |
678 |
|
|
} |
679 |
greg |
2.22 |
/*** seek always as safety measure |
680 |
|
|
if (n) ***/ /* alignment */ |
681 |
greg |
2.21 |
if (lseek(fileno(ambfp), flen-n, 0) < 0) |
682 |
|
|
goto seekerr; |
683 |
greg |
2.7 |
} |
684 |
greg |
2.21 |
#ifdef DEBUG |
685 |
|
|
if (ambfp->_ptr - ambfp->_base != nunflshed*AMBVALSIZ) { |
686 |
|
|
sprintf(errmsg, "ambient file buffer at %d rather than %d", |
687 |
|
|
ambfp->_ptr - ambfp->_base, |
688 |
|
|
nunflshed*AMBVALSIZ); |
689 |
|
|
error(CONSISTENCY, errmsg); |
690 |
|
|
} |
691 |
|
|
#endif |
692 |
greg |
2.15 |
syncend: |
693 |
greg |
2.7 |
n = fflush(ambfp); /* calls write() at last */ |
694 |
greg |
2.21 |
if ((lastpos = lseek(fileno(ambfp), 0L, 1)) < 0) |
695 |
|
|
goto seekerr; |
696 |
greg |
2.19 |
aflock(F_UNLCK); /* release file */ |
697 |
greg |
2.16 |
nunflshed = 0; |
698 |
greg |
2.7 |
return(n); |
699 |
greg |
2.21 |
seekerr: |
700 |
|
|
error(SYSTEM, "seek failed in ambsync"); |
701 |
greg |
2.18 |
} |
702 |
|
|
|
703 |
|
|
#else |
704 |
|
|
|
705 |
|
|
int |
706 |
|
|
ambsync() /* flush ambient file */ |
707 |
|
|
{ |
708 |
|
|
if (nunflshed == 0) |
709 |
|
|
return(0); |
710 |
|
|
nunflshed = 0; |
711 |
|
|
return(fflush(ambfp)); |
712 |
greg |
1.1 |
} |
713 |
greg |
2.10 |
|
714 |
|
|
#endif |