1 |
< |
/* Copyright (c) 1991 Regents of the University of California */ |
1 |
> |
/* Copyright (c) 1993 Regents of the University of California */ |
2 |
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|
3 |
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#ifndef lint |
4 |
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static char SCCSid[] = "$SunId$ LBL"; |
6 |
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|
7 |
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/* |
8 |
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* ambient.c - routines dealing with ambient (inter-reflected) component. |
9 |
– |
* |
10 |
– |
* The macro AMBFLUSH (if defined) is the number of ambient values |
11 |
– |
* to wait before flushing to the ambient file. |
12 |
– |
* |
13 |
– |
* 5/9/86 |
9 |
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*/ |
10 |
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|
11 |
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#include "ray.h" |
18 |
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|
19 |
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#include "random.h" |
20 |
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|
21 |
< |
#define OCTSCALE 0.5 /* ceil((valid rad.)/(cube size)) */ |
21 |
> |
#define OCTSCALE 0.5 /* ceil((valid rad.)/(cube size)) */ |
22 |
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|
23 |
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typedef struct ambtree { |
24 |
< |
AMBVAL *alist; /* ambient value list */ |
25 |
< |
struct ambtree *kid; /* 8 child nodes */ |
24 |
> |
AMBVAL *alist; /* ambient value list */ |
25 |
> |
struct ambtree *kid; /* 8 child nodes */ |
26 |
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} AMBTREE; /* ambient octree */ |
27 |
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|
28 |
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extern CUBE thescene; /* contains space boundaries */ |
29 |
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|
30 |
< |
#define MAXASET 511 /* maximum number of elements in ambient set */ |
31 |
< |
OBJECT ambset[MAXASET+1]={0}; /* ambient include/exclude set */ |
30 |
> |
#define MAXASET 511 /* maximum number of elements in ambient set */ |
31 |
> |
OBJECT ambset[MAXASET+1]={0}; /* ambient include/exclude set */ |
32 |
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|
33 |
< |
double maxarad; /* maximum ambient radius */ |
34 |
< |
double minarad; /* minimum ambient radius */ |
33 |
> |
double maxarad; /* maximum ambient radius */ |
34 |
> |
double minarad; /* minimum ambient radius */ |
35 |
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|
36 |
< |
static AMBTREE atrunk; /* our ambient trunk node */ |
36 |
> |
static AMBTREE atrunk; /* our ambient trunk node */ |
37 |
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|
38 |
|
static FILE *ambfp = NULL; /* ambient file pointer */ |
39 |
+ |
static int nunflshed = 0; /* number of unflushed ambient values */ |
40 |
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|
41 |
< |
#define newambval() (AMBVAL *)bmalloc(sizeof(AMBVAL)) |
41 |
> |
#define AMBFLUSH (BUFSIZ/AMBVALSIZ) |
42 |
|
|
43 |
< |
#define newambtree() (AMBTREE *)calloc(8, sizeof(AMBTREE)) |
43 |
> |
#define newambval() (AMBVAL *)bmalloc(sizeof(AMBVAL)) |
44 |
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|
45 |
+ |
#define newambtree() (AMBTREE *)calloc(8, sizeof(AMBTREE)) |
46 |
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|
47 |
< |
setambient(afile) /* initialize calculation */ |
48 |
< |
char *afile; |
47 |
> |
extern long ftell(), lseek(); |
48 |
> |
static int initambfile(), avsave(), avinsert(); |
49 |
> |
|
50 |
> |
|
51 |
> |
setambres(ar) /* set ambient resolution */ |
52 |
> |
int ar; |
53 |
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{ |
54 |
< |
long ftell(); |
55 |
< |
AMBVAL amb; |
54 |
> |
/* set min & max radii */ |
55 |
> |
if (ar <= 0) { |
56 |
> |
minarad = 0.0; |
57 |
> |
maxarad = thescene.cusize / 2.0; |
58 |
> |
} else { |
59 |
> |
minarad = thescene.cusize / ar; |
60 |
> |
maxarad = 16.0 * minarad; /* heuristic */ |
61 |
> |
if (maxarad > thescene.cusize / 2.0) |
62 |
> |
maxarad = thescene.cusize / 2.0; |
63 |
> |
} |
64 |
> |
if (maxarad <= FTINY) |
65 |
> |
maxarad = .001; |
66 |
> |
} |
67 |
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|
56 |
– |
maxarad = thescene.cusize / 2.0; /* maximum radius */ |
57 |
– |
/* minimum radius */ |
58 |
– |
minarad = ambres > 0 ? thescene.cusize/ambres : 0.0; |
68 |
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|
69 |
< |
/* open ambient file */ |
70 |
< |
if (afile != NULL) |
69 |
> |
setambient(afile) /* initialize calculation */ |
70 |
> |
char *afile; |
71 |
> |
{ |
72 |
> |
long headlen; |
73 |
> |
AMBVAL amb; |
74 |
> |
/* init ambient limits */ |
75 |
> |
setambres(ambres); |
76 |
> |
/* open ambient file */ |
77 |
> |
if (afile != NULL) { |
78 |
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if ((ambfp = fopen(afile, "r+")) != NULL) { |
79 |
< |
while (fread((char *)&amb,sizeof(AMBVAL),1,ambfp) == 1) |
79 |
> |
initambfile(0); |
80 |
> |
headlen = ftell(ambfp); |
81 |
> |
while (readambval(&amb, ambfp)) |
82 |
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avinsert(&amb, &atrunk, thescene.cuorg, |
83 |
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thescene.cusize); |
84 |
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/* align */ |
85 |
< |
fseek(ambfp, -(ftell(ambfp)%sizeof(AMBVAL)), 1); |
86 |
< |
} else if ((ambfp = fopen(afile, "w")) == NULL) { |
85 |
> |
fseek(ambfp, -((ftell(ambfp)-headlen)%AMBVALSIZ), 1); |
86 |
> |
} else if ((ambfp = fopen(afile, "w+")) != NULL) |
87 |
> |
initambfile(1); |
88 |
> |
else { |
89 |
|
sprintf(errmsg, "cannot open ambient file \"%s\"", |
90 |
|
afile); |
91 |
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error(SYSTEM, errmsg); |
92 |
|
} |
93 |
+ |
nunflshed++; /* lie */ |
94 |
+ |
ambsync(); |
95 |
+ |
} |
96 |
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} |
97 |
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|
98 |
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|
99 |
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ambnotify(obj) /* record new modifier */ |
100 |
< |
OBJECT obj; |
100 |
> |
OBJECT obj; |
101 |
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{ |
102 |
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static int hitlimit = 0; |
103 |
< |
register OBJREC *o = objptr(obj); |
103 |
> |
register OBJREC *o = objptr(obj); |
104 |
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register char **amblp; |
105 |
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|
106 |
|
if (hitlimit || !ismodifier(o->otype)) |
123 |
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register RAY *r; |
124 |
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{ |
125 |
|
static int rdepth = 0; /* ambient recursion */ |
126 |
< |
double wsum; |
126 |
> |
double d; |
127 |
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|
105 |
– |
rdepth++; /* increment level */ |
106 |
– |
|
128 |
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if (ambdiv <= 0) /* no ambient calculation */ |
129 |
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goto dumbamb; |
130 |
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/* check number of bounces */ |
131 |
< |
if (rdepth > ambounce) |
131 |
> |
if (rdepth >= ambounce) |
132 |
|
goto dumbamb; |
133 |
|
/* check ambient list */ |
134 |
|
if (ambincl != -1 && r->ro != NULL && |
136 |
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goto dumbamb; |
137 |
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|
138 |
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if (ambacc <= FTINY) { /* no ambient storage */ |
139 |
< |
if (doambient(acol, r, NULL, NULL) == 0.0) |
139 |
> |
rdepth++; |
140 |
> |
d = doambient(acol, r, r->rweight, NULL, NULL); |
141 |
> |
rdepth--; |
142 |
> |
if (d == 0.0) |
143 |
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goto dumbamb; |
144 |
< |
goto done; |
144 |
> |
return; |
145 |
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} |
146 |
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/* get ambient value */ |
147 |
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setcolor(acol, 0.0, 0.0, 0.0); |
148 |
< |
wsum = sumambient(acol, r, &atrunk, thescene.cuorg, thescene.cusize); |
149 |
< |
if (wsum > FTINY) |
150 |
< |
scalecolor(acol, 1.0/wsum); |
151 |
< |
else if (makeambient(acol, r) == 0.0) |
152 |
< |
goto dumbamb; |
153 |
< |
goto done; |
154 |
< |
|
148 |
> |
d = sumambient(acol, r, rdepth, |
149 |
> |
&atrunk, thescene.cuorg, thescene.cusize); |
150 |
> |
if (d > FTINY) |
151 |
> |
scalecolor(acol, 1.0/d); |
152 |
> |
else { |
153 |
> |
d = makeambient(acol, r, rdepth++); |
154 |
> |
rdepth--; |
155 |
> |
} |
156 |
> |
if (d > FTINY) |
157 |
> |
return; |
158 |
|
dumbamb: /* return global value */ |
159 |
|
copycolor(acol, ambval); |
133 |
– |
done: /* must finish here! */ |
134 |
– |
rdepth--; |
160 |
|
} |
161 |
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|
162 |
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|
163 |
|
double |
164 |
< |
sumambient(acol, r, at, c0, s) /* get interpolated ambient value */ |
164 |
> |
sumambient(acol, r, al, at, c0, s) /* get interpolated ambient value */ |
165 |
|
COLOR acol; |
166 |
|
register RAY *r; |
167 |
< |
AMBTREE *at; |
167 |
> |
int al; |
168 |
> |
AMBTREE *at; |
169 |
|
FVECT c0; |
170 |
< |
double s; |
170 |
> |
double s; |
171 |
|
{ |
172 |
< |
extern double sqrt(); |
147 |
< |
double d, e1, e2, wt, wsum; |
172 |
> |
double d, e1, e2, wt, wsum; |
173 |
|
COLOR ct; |
174 |
|
FVECT ck0; |
175 |
|
int i; |
176 |
|
register int j; |
177 |
< |
register AMBVAL *av; |
177 |
> |
register AMBVAL *av; |
178 |
|
/* do this node */ |
179 |
|
wsum = 0.0; |
180 |
|
for (av = at->alist; av != NULL; av = av->next) { |
181 |
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/* |
182 |
< |
* Ray strength test. |
182 |
> |
* Ambient level test. |
183 |
|
*/ |
184 |
< |
if (av->lvl > r->rlvl || av->weight < r->rweight-FTINY) |
184 |
> |
if (av->lvl > al || av->weight < r->rweight-FTINY) |
185 |
|
continue; |
186 |
|
/* |
187 |
|
* Ambient radius test. |
208 |
|
for (j = 0; j < 3; j++) |
209 |
|
d += (r->rop[j] - av->pos[j]) * |
210 |
|
(av->dir[j] + r->ron[j]); |
211 |
< |
if (d*0.5 < -minarad*ambacc) |
211 |
> |
if (d*0.5 < -minarad*ambacc-.001) |
212 |
|
continue; |
213 |
|
/* |
214 |
|
* Jittering final test reduces image artifacts. |
215 |
|
*/ |
216 |
|
wt = sqrt(e1) + sqrt(e2); |
217 |
< |
wt *= .9 + .2*frandom(); |
217 |
> |
wt *= .9 + .2*urand(9015+samplendx); |
218 |
|
if (wt > ambacc) |
219 |
|
continue; |
220 |
|
if (wt <= 1e-3) |
222 |
|
else |
223 |
|
wt = 1.0 / wt; |
224 |
|
wsum += wt; |
225 |
< |
copycolor(ct, av->val); |
225 |
> |
extambient(ct, av, r->rop, r->ron); |
226 |
|
scalecolor(ct, wt); |
227 |
|
addcolor(acol, ct); |
228 |
|
} |
241 |
|
break; |
242 |
|
} |
243 |
|
if (j == 3) |
244 |
< |
wsum += sumambient(acol, r, at->kid+i, ck0, s); |
244 |
> |
wsum += sumambient(acol, r, al, at->kid+i, ck0, s); |
245 |
|
} |
246 |
|
return(wsum); |
247 |
|
} |
248 |
|
|
249 |
|
|
250 |
|
double |
251 |
< |
makeambient(acol, r) /* make a new ambient value */ |
251 |
> |
makeambient(acol, r, al) /* make a new ambient value */ |
252 |
|
COLOR acol; |
253 |
|
register RAY *r; |
254 |
+ |
int al; |
255 |
|
{ |
256 |
< |
AMBVAL amb; |
256 |
> |
AMBVAL amb; |
257 |
|
FVECT gp, gd; |
258 |
< |
|
259 |
< |
amb.rad = doambient(acol, r, gp, gd); /* compute ambient */ |
258 |
> |
/* compute weight */ |
259 |
> |
amb.weight = pow(AVGREFL, (double)al); |
260 |
> |
if (r->rweight < 0.2*amb.weight) /* heuristic */ |
261 |
> |
amb.weight = r->rweight; |
262 |
> |
/* compute ambient */ |
263 |
> |
amb.rad = doambient(acol, r, amb.weight, gp, gd); |
264 |
|
if (amb.rad == 0.0) |
265 |
|
return(0.0); |
266 |
|
/* store it */ |
267 |
|
VCOPY(amb.pos, r->rop); |
268 |
|
VCOPY(amb.dir, r->ron); |
269 |
< |
amb.lvl = r->rlvl; |
240 |
< |
amb.weight = r->rweight; |
269 |
> |
amb.lvl = al; |
270 |
|
copycolor(amb.val, acol); |
271 |
|
VCOPY(amb.gpos, gp); |
272 |
|
VCOPY(amb.gdir, gd); |
273 |
|
/* insert into tree */ |
274 |
< |
avinsert(&amb, &atrunk, thescene.cuorg, thescene.cusize); |
246 |
< |
avsave(&amb); /* write to file */ |
274 |
> |
avsave(&amb); /* and save to file */ |
275 |
|
return(amb.rad); |
276 |
|
} |
277 |
|
|
278 |
|
|
279 |
+ |
extambient(cr, ap, pv, nv) /* extrapolate value at pv, nv */ |
280 |
+ |
COLOR cr; |
281 |
+ |
register AMBVAL *ap; |
282 |
+ |
FVECT pv, nv; |
283 |
+ |
{ |
284 |
+ |
FVECT v1, v2; |
285 |
+ |
register int i; |
286 |
+ |
double d; |
287 |
+ |
|
288 |
+ |
d = 1.0; /* zeroeth order */ |
289 |
+ |
/* gradient due to translation */ |
290 |
+ |
for (i = 0; i < 3; i++) |
291 |
+ |
d += ap->gpos[i]*(pv[i]-ap->pos[i]); |
292 |
+ |
/* gradient due to rotation */ |
293 |
+ |
VCOPY(v1, ap->dir); |
294 |
+ |
fcross(v2, v1, nv); |
295 |
+ |
d += DOT(ap->gdir, v2); |
296 |
+ |
if (d <= 0.0) { |
297 |
+ |
setcolor(cr, 0.0, 0.0, 0.0); |
298 |
+ |
return; |
299 |
+ |
} |
300 |
+ |
copycolor(cr, ap->val); |
301 |
+ |
scalecolor(cr, d); |
302 |
+ |
} |
303 |
+ |
|
304 |
+ |
|
305 |
|
static |
306 |
< |
avsave(av) /* save an ambient value */ |
307 |
< |
AMBVAL *av; |
306 |
> |
initambfile(creat) /* initialize ambient file */ |
307 |
> |
int creat; |
308 |
|
{ |
309 |
< |
#ifdef AMBFLUSH |
310 |
< |
static int nunflshed = 0; |
309 |
> |
extern char *progname, *octname, VersionID[]; |
310 |
> |
|
311 |
> |
#ifdef MSDOS |
312 |
> |
setmode(fileno(ambfp), O_BINARY); |
313 |
|
#endif |
314 |
+ |
setbuf(ambfp, bmalloc(BUFSIZ)); |
315 |
+ |
if (creat) { /* new file */ |
316 |
+ |
fprintf(ambfp, "%s -av %g %g %g -ab %d -aa %g ", |
317 |
+ |
progname, colval(ambval,RED), |
318 |
+ |
colval(ambval,GRN), colval(ambval,BLU), |
319 |
+ |
ambounce, ambacc); |
320 |
+ |
fprintf(ambfp, "-ad %d -as %d -ar %d %s\n", |
321 |
+ |
ambdiv, ambssamp, ambres, |
322 |
+ |
octname==NULL ? "" : octname); |
323 |
+ |
fprintf(ambfp, "SOFTWARE= %s\n", VersionID); |
324 |
+ |
fputformat(AMBFMT, ambfp); |
325 |
+ |
putc('\n', ambfp); |
326 |
+ |
putambmagic(ambfp); |
327 |
+ |
} else if (checkheader(ambfp, AMBFMT, NULL) < 0 || !hasambmagic(ambfp)) |
328 |
+ |
error(USER, "bad ambient file"); |
329 |
+ |
} |
330 |
+ |
|
331 |
+ |
|
332 |
+ |
static |
333 |
+ |
avsave(av) /* insert and save an ambient value */ |
334 |
+ |
AMBVAL *av; |
335 |
+ |
{ |
336 |
+ |
avinsert(av, &atrunk, thescene.cuorg, thescene.cusize); |
337 |
|
if (ambfp == NULL) |
338 |
|
return; |
339 |
< |
if (fwrite((char *)av, sizeof(AMBVAL), 1, ambfp) != 1) |
339 |
> |
if (writambval(av, ambfp) < 0) |
340 |
|
goto writerr; |
341 |
< |
#ifdef AMBFLUSH |
342 |
< |
if (++nunflshed >= AMBFLUSH) { |
264 |
< |
if (fflush(ambfp) == EOF) |
341 |
> |
if (++nunflshed >= AMBFLUSH) |
342 |
> |
if (ambsync() == EOF) |
343 |
|
goto writerr; |
266 |
– |
nunflshed = 0; |
267 |
– |
} |
268 |
– |
#endif |
344 |
|
return; |
345 |
|
writerr: |
346 |
|
error(SYSTEM, "error writing ambient file"); |
349 |
|
|
350 |
|
static |
351 |
|
avinsert(aval, at, c0, s) /* insert ambient value in a tree */ |
352 |
< |
AMBVAL *aval; |
352 |
> |
AMBVAL *aval; |
353 |
|
register AMBTREE *at; |
354 |
|
FVECT c0; |
355 |
< |
double s; |
355 |
> |
double s; |
356 |
|
{ |
357 |
|
FVECT ck0; |
358 |
|
int branch; |
359 |
< |
register AMBVAL *av; |
359 |
> |
register AMBVAL *av; |
360 |
|
register int i; |
361 |
|
|
362 |
|
if ((av = newambval()) == NULL) |
382 |
|
memerr: |
383 |
|
error(SYSTEM, "out of memory in avinsert"); |
384 |
|
} |
385 |
+ |
|
386 |
+ |
|
387 |
+ |
#ifdef F_SETLKW |
388 |
+ |
|
389 |
+ |
int |
390 |
+ |
ambsync() /* synchronize ambient file */ |
391 |
+ |
{ |
392 |
+ |
static FILE *ambinp = NULL; |
393 |
+ |
static long lastpos = -1; |
394 |
+ |
struct flock fls; |
395 |
+ |
long flen; |
396 |
+ |
AMBVAL avs; |
397 |
+ |
register int n; |
398 |
+ |
|
399 |
+ |
if (nunflshed == 0) |
400 |
+ |
return(0); |
401 |
+ |
/* gain exclusive access */ |
402 |
+ |
fls.l_type = F_WRLCK; |
403 |
+ |
fls.l_whence = 0; |
404 |
+ |
fls.l_start = 0L; |
405 |
+ |
fls.l_len = 0L; |
406 |
+ |
if (fcntl(fileno(ambfp), F_SETLKW, &fls) < 0) |
407 |
+ |
error(SYSTEM, "cannot lock ambient file"); |
408 |
+ |
if (lastpos < 0) /* initializing */ |
409 |
+ |
goto syncend; |
410 |
+ |
/* see if file has grown */ |
411 |
+ |
if ((flen = lseek(fileno(ambfp), 0L, 2)) < 0) |
412 |
+ |
error(SYSTEM, "cannot seek on ambient file"); |
413 |
+ |
if (n = flen - lastpos) { /* file has grown */ |
414 |
+ |
if (ambinp == NULL) { /* use duplicate filedes */ |
415 |
+ |
ambinp = fdopen(dup(fileno(ambfp)), "r"); |
416 |
+ |
if (ambinp == NULL) |
417 |
+ |
error(SYSTEM, "fdopen failed in ambsync"); |
418 |
+ |
} |
419 |
+ |
if (fseek(ambinp, lastpos, 0) < 0) |
420 |
+ |
error(SYSTEM, "fseek failed in ambsync"); |
421 |
+ |
while (n >= AMBVALSIZ) { /* load contributed values */ |
422 |
+ |
readambval(&avs, ambinp); |
423 |
+ |
avinsert(&avs,&atrunk,thescene.cuorg,thescene.cusize); |
424 |
+ |
n -= AMBVALSIZ; |
425 |
+ |
} |
426 |
+ |
if (n) /* alignment */ |
427 |
+ |
lseek(fileno(ambfp), flen-n, 0); |
428 |
+ |
} |
429 |
+ |
syncend: |
430 |
+ |
n = fflush(ambfp); /* calls write() at last */ |
431 |
+ |
lastpos = lseek(fileno(ambfp), 0L, 1); |
432 |
+ |
fls.l_type = F_UNLCK; /* release file */ |
433 |
+ |
fcntl(fileno(ambfp), F_SETLKW, &fls); |
434 |
+ |
nunflshed = 0; |
435 |
+ |
return(n); |
436 |
+ |
} |
437 |
+ |
|
438 |
+ |
#else |
439 |
+ |
|
440 |
+ |
int |
441 |
+ |
ambsync() /* flush ambient file */ |
442 |
+ |
{ |
443 |
+ |
if (nunflshed == 0) |
444 |
+ |
return(0); |
445 |
+ |
nunflshed = 0; |
446 |
+ |
return(fflush(ambfp)); |
447 |
+ |
} |
448 |
+ |
|
449 |
+ |
#endif |