1 |
< |
/* Copyright (c) 1986 Regents of the University of California */ |
1 |
> |
/* Copyright (c) 1993 Regents of the University of California */ |
2 |
|
|
3 |
|
#ifndef lint |
4 |
|
static char SCCSid[] = "$SunId$ LBL"; |
6 |
|
|
7 |
|
/* |
8 |
|
* 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 |
|
*/ |
10 |
|
|
11 |
|
#include "ray.h" |
14 |
|
|
15 |
|
#include "otypes.h" |
16 |
|
|
17 |
+ |
#include "ambient.h" |
18 |
+ |
|
19 |
|
#include "random.h" |
20 |
|
|
21 |
< |
#define OCTSCALE 0.5 /* ceil((valid rad.)/(cube size)) */ |
21 |
> |
#define OCTSCALE 0.5 /* ceil((valid rad.)/(cube size)) */ |
22 |
|
|
23 |
+ |
typedef struct ambtree { |
24 |
+ |
AMBVAL *alist; /* ambient value list */ |
25 |
+ |
struct ambtree *kid; /* 8 child nodes */ |
26 |
+ |
} AMBTREE; /* ambient octree */ |
27 |
+ |
|
28 |
|
extern CUBE thescene; /* contains space boundaries */ |
29 |
|
|
30 |
< |
extern COLOR ambval; /* global ambient component */ |
31 |
< |
extern double ambacc; /* ambient accuracy */ |
30 |
< |
extern int ambres; /* ambient resolution */ |
31 |
< |
extern int ambdiv; /* number of divisions for calculation */ |
32 |
< |
extern int ambssamp; /* number of super-samples */ |
33 |
< |
extern int ambounce; /* number of ambient bounces */ |
34 |
< |
extern char *amblist[]; /* ambient include/exclude list */ |
35 |
< |
extern int ambincl; /* include == 1, exclude == 0 */ |
30 |
> |
#define MAXASET 511 /* maximum number of elements in ambient set */ |
31 |
> |
OBJECT ambset[MAXASET+1]={0}; /* ambient include/exclude set */ |
32 |
|
|
33 |
< |
#define MAXASET 511 /* maximum number of elements in ambient set */ |
34 |
< |
OBJECT ambset[MAXASET+1]={0}; /* ambient include/exclude set */ |
33 |
> |
double maxarad; /* maximum ambient radius */ |
34 |
> |
double minarad; /* minimum ambient radius */ |
35 |
|
|
36 |
< |
double maxarad; /* maximum ambient radius */ |
41 |
< |
double minarad; /* minimum ambient radius */ |
36 |
> |
static AMBTREE atrunk; /* our ambient trunk node */ |
37 |
|
|
38 |
< |
typedef struct ambval { |
39 |
< |
FVECT pos; /* position in space */ |
45 |
< |
FVECT dir; /* normal direction */ |
46 |
< |
int lvl; /* recursion level of parent ray */ |
47 |
< |
float weight; /* weight of parent ray */ |
48 |
< |
COLOR val; /* computed ambient value */ |
49 |
< |
float rad; /* validity radius */ |
50 |
< |
struct ambval *next; /* next in list */ |
51 |
< |
} AMBVAL; /* ambient value */ |
38 |
> |
static char *ambfname = NULL; /* ambient file name */ |
39 |
> |
static FILE *ambfp = NULL; /* ambient file pointer */ |
40 |
|
|
41 |
< |
typedef struct ambtree { |
54 |
< |
AMBVAL *alist; /* ambient value list */ |
55 |
< |
struct ambtree *kid; /* 8 child nodes */ |
56 |
< |
} AMBTREE; /* ambient octree */ |
41 |
> |
#define AMBFLUSH (BUFSIZ/AMBVALSIZ) |
42 |
|
|
43 |
< |
typedef struct { |
59 |
< |
float k; /* error contribution per sample */ |
60 |
< |
COLOR v; /* ray sum */ |
61 |
< |
int n; /* number of samples */ |
62 |
< |
short t, p; /* theta, phi indices */ |
63 |
< |
} AMBSAMP; /* ambient sample */ |
43 |
> |
#define newambval() (AMBVAL *)bmalloc(sizeof(AMBVAL)) |
44 |
|
|
45 |
< |
static AMBTREE atrunk; /* our ambient trunk node */ |
45 |
> |
#define newambtree() (AMBTREE *)calloc(8, sizeof(AMBTREE)) |
46 |
|
|
47 |
< |
static FILE *ambfp = NULL; /* ambient file pointer */ |
47 |
> |
extern long ftell(), lseek(); |
48 |
> |
static int initambfile(), avsave(), avinsert(), ambsync(); |
49 |
|
|
69 |
– |
#define newambval() (AMBVAL *)bmalloc(sizeof(AMBVAL)) |
50 |
|
|
51 |
< |
#define newambtree() (AMBTREE *)calloc(8, sizeof(AMBTREE)) |
51 |
> |
setambres(ar) /* set ambient resolution */ |
52 |
> |
int ar; |
53 |
> |
{ |
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 |
|
|
73 |
– |
double sumambient(), doambient(), makeambient(); |
68 |
|
|
75 |
– |
|
69 |
|
setambient(afile) /* initialize calculation */ |
70 |
|
char *afile; |
71 |
|
{ |
72 |
< |
long ftell(); |
73 |
< |
AMBVAL amb; |
74 |
< |
|
75 |
< |
maxarad = thescene.cusize / 2.0; /* maximum radius */ |
76 |
< |
/* minimum radius */ |
77 |
< |
minarad = ambres > 0 ? thescene.cusize/ambres : 0.0; |
85 |
< |
|
86 |
< |
/* open ambient file */ |
87 |
< |
if (afile != NULL) |
72 |
> |
long headlen; |
73 |
> |
AMBVAL amb; |
74 |
> |
/* init ambient limits */ |
75 |
> |
setambres(ambres); |
76 |
> |
/* open ambient file */ |
77 |
> |
if ((ambfname = afile) != NULL) |
78 |
|
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 |
|
avinsert(&amb, &atrunk, thescene.cuorg, |
83 |
|
thescene.cusize); |
84 |
|
/* 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 |
|
error(SYSTEM, errmsg); |
94 |
|
|
95 |
|
|
96 |
|
ambnotify(obj) /* record new modifier */ |
97 |
< |
OBJECT obj; |
97 |
> |
OBJECT obj; |
98 |
|
{ |
99 |
|
static int hitlimit = 0; |
100 |
< |
register OBJREC *o = objptr(obj); |
100 |
> |
register OBJREC *o = objptr(obj); |
101 |
|
register char **amblp; |
102 |
|
|
103 |
|
if (hitlimit || !ismodifier(o->otype)) |
120 |
|
register RAY *r; |
121 |
|
{ |
122 |
|
static int rdepth = 0; /* ambient recursion */ |
123 |
< |
double wsum; |
123 |
> |
double d; |
124 |
|
|
131 |
– |
rdepth++; /* increment level */ |
132 |
– |
|
125 |
|
if (ambdiv <= 0) /* no ambient calculation */ |
126 |
|
goto dumbamb; |
127 |
|
/* check number of bounces */ |
128 |
< |
if (rdepth > ambounce) |
128 |
> |
if (rdepth >= ambounce) |
129 |
|
goto dumbamb; |
130 |
|
/* check ambient list */ |
131 |
|
if (ambincl != -1 && r->ro != NULL && |
133 |
|
goto dumbamb; |
134 |
|
|
135 |
|
if (ambacc <= FTINY) { /* no ambient storage */ |
136 |
< |
if (doambient(acol, r) == 0.0) |
136 |
> |
rdepth++; |
137 |
> |
d = doambient(acol, r, r->rweight, NULL, NULL); |
138 |
> |
rdepth--; |
139 |
> |
if (d == 0.0) |
140 |
|
goto dumbamb; |
141 |
< |
goto done; |
141 |
> |
return; |
142 |
|
} |
143 |
|
/* get ambient value */ |
144 |
|
setcolor(acol, 0.0, 0.0, 0.0); |
145 |
< |
wsum = sumambient(acol, r, &atrunk, thescene.cuorg, thescene.cusize); |
146 |
< |
if (wsum > FTINY) |
147 |
< |
scalecolor(acol, 1.0/wsum); |
148 |
< |
else if (makeambient(acol, r) == 0.0) |
149 |
< |
goto dumbamb; |
150 |
< |
goto done; |
151 |
< |
|
145 |
> |
d = sumambient(acol, r, rdepth, |
146 |
> |
&atrunk, thescene.cuorg, thescene.cusize); |
147 |
> |
if (d > FTINY) |
148 |
> |
scalecolor(acol, 1.0/d); |
149 |
> |
else { |
150 |
> |
d = makeambient(acol, r, rdepth++); |
151 |
> |
rdepth--; |
152 |
> |
} |
153 |
> |
if (d > FTINY) |
154 |
> |
return; |
155 |
|
dumbamb: /* return global value */ |
156 |
|
copycolor(acol, ambval); |
159 |
– |
done: /* must finish here! */ |
160 |
– |
rdepth--; |
157 |
|
} |
158 |
|
|
159 |
|
|
160 |
|
double |
161 |
< |
sumambient(acol, r, at, c0, s) /* get interpolated ambient value */ |
161 |
> |
sumambient(acol, r, al, at, c0, s) /* get interpolated ambient value */ |
162 |
|
COLOR acol; |
163 |
|
register RAY *r; |
164 |
< |
AMBTREE *at; |
164 |
> |
int al; |
165 |
> |
AMBTREE *at; |
166 |
|
FVECT c0; |
167 |
< |
double s; |
167 |
> |
double s; |
168 |
|
{ |
169 |
< |
extern double sqrt(); |
173 |
< |
double d, e1, e2, wt, wsum; |
169 |
> |
double d, e1, e2, wt, wsum; |
170 |
|
COLOR ct; |
171 |
|
FVECT ck0; |
172 |
|
int i; |
173 |
|
register int j; |
174 |
< |
register AMBVAL *av; |
174 |
> |
register AMBVAL *av; |
175 |
|
/* do this node */ |
176 |
|
wsum = 0.0; |
177 |
|
for (av = at->alist; av != NULL; av = av->next) { |
178 |
|
/* |
179 |
< |
* Ray strength test. |
179 |
> |
* Ambient level test. |
180 |
|
*/ |
181 |
< |
if (av->lvl > r->rlvl || av->weight < r->rweight-FTINY) |
181 |
> |
if (av->lvl > al || av->weight < r->rweight-FTINY) |
182 |
|
continue; |
183 |
|
/* |
184 |
|
* Ambient radius test. |
205 |
|
for (j = 0; j < 3; j++) |
206 |
|
d += (r->rop[j] - av->pos[j]) * |
207 |
|
(av->dir[j] + r->ron[j]); |
208 |
< |
if (d < -minarad) |
208 |
> |
if (d*0.5 < -minarad*ambacc-.001) |
209 |
|
continue; |
210 |
|
/* |
211 |
|
* Jittering final test reduces image artifacts. |
212 |
|
*/ |
213 |
|
wt = sqrt(e1) + sqrt(e2); |
214 |
< |
wt *= .9 + .2*frandom(); |
214 |
> |
wt *= .9 + .2*urand(9015+samplendx); |
215 |
|
if (wt > ambacc) |
216 |
|
continue; |
217 |
|
if (wt <= 1e-3) |
219 |
|
else |
220 |
|
wt = 1.0 / wt; |
221 |
|
wsum += wt; |
222 |
< |
copycolor(ct, av->val); |
222 |
> |
extambient(ct, av, r->rop, r->ron); |
223 |
|
scalecolor(ct, wt); |
224 |
|
addcolor(acol, ct); |
225 |
|
} |
238 |
|
break; |
239 |
|
} |
240 |
|
if (j == 3) |
241 |
< |
wsum += sumambient(acol, r, at->kid+i, ck0, s); |
241 |
> |
wsum += sumambient(acol, r, al, at->kid+i, ck0, s); |
242 |
|
} |
243 |
|
return(wsum); |
244 |
|
} |
245 |
|
|
246 |
|
|
247 |
|
double |
248 |
< |
makeambient(acol, r) /* make a new ambient value */ |
248 |
> |
makeambient(acol, r, al) /* make a new ambient value */ |
249 |
|
COLOR acol; |
250 |
|
register RAY *r; |
251 |
+ |
int al; |
252 |
|
{ |
253 |
< |
AMBVAL amb; |
254 |
< |
|
255 |
< |
amb.rad = doambient(acol, r); /* compute ambient */ |
253 |
> |
AMBVAL amb; |
254 |
> |
FVECT gp, gd; |
255 |
> |
/* compute weight */ |
256 |
> |
amb.weight = pow(AVGREFL, (double)al); |
257 |
> |
if (r->rweight < 0.2*amb.weight) /* heuristic */ |
258 |
> |
amb.weight = r->rweight; |
259 |
> |
/* compute ambient */ |
260 |
> |
amb.rad = doambient(acol, r, amb.weight, gp, gd); |
261 |
|
if (amb.rad == 0.0) |
262 |
|
return(0.0); |
263 |
|
/* store it */ |
264 |
|
VCOPY(amb.pos, r->rop); |
265 |
|
VCOPY(amb.dir, r->ron); |
266 |
< |
amb.lvl = r->rlvl; |
265 |
< |
amb.weight = r->rweight; |
266 |
> |
amb.lvl = al; |
267 |
|
copycolor(amb.val, acol); |
268 |
+ |
VCOPY(amb.gpos, gp); |
269 |
+ |
VCOPY(amb.gdir, gd); |
270 |
|
/* insert into tree */ |
271 |
< |
avinsert(&amb, &atrunk, thescene.cuorg, thescene.cusize); |
269 |
< |
avsave(&amb); /* write to file */ |
271 |
> |
avsave(&amb); /* and save to file */ |
272 |
|
return(amb.rad); |
273 |
|
} |
274 |
|
|
275 |
|
|
276 |
< |
double |
277 |
< |
doambient(acol, r) /* compute ambient component */ |
278 |
< |
COLOR acol; |
279 |
< |
register RAY *r; |
276 |
> |
extambient(cr, ap, pv, nv) /* extrapolate value at pv, nv */ |
277 |
> |
COLOR cr; |
278 |
> |
register AMBVAL *ap; |
279 |
> |
FVECT pv, nv; |
280 |
|
{ |
281 |
< |
extern int ambcmp(); |
282 |
< |
extern double sin(), cos(), sqrt(); |
283 |
< |
int hlist[4]; |
282 |
< |
double phi, xd, yd, zd; |
283 |
< |
double b, b2; |
284 |
< |
register AMBSAMP *div; |
285 |
< |
AMBSAMP dnew; |
286 |
< |
RAY ar; |
287 |
< |
FVECT ux, uy; |
288 |
< |
double arad; |
289 |
< |
int ndivs, nt, np, ns, ne, i, j; |
290 |
< |
register int k; |
281 |
> |
FVECT v1, v2; |
282 |
> |
register int i; |
283 |
> |
double d; |
284 |
|
|
285 |
< |
setcolor(acol, 0.0, 0.0, 0.0); |
286 |
< |
/* set number of divisions */ |
287 |
< |
nt = sqrt(ambdiv * r->rweight * 0.5) + 0.5; |
288 |
< |
np = 2 * nt; |
289 |
< |
ndivs = nt * np; |
290 |
< |
/* check first */ |
291 |
< |
if (ndivs == 0 || rayorigin(&ar, r, AMBIENT, 0.5) < 0) |
292 |
< |
return(0.0); |
293 |
< |
/* set number of super-samples */ |
294 |
< |
ns = ambssamp * r->rweight + 0.5; |
295 |
< |
if (ns > 0) { |
303 |
< |
div = (AMBSAMP *)malloc(ndivs*sizeof(AMBSAMP)); |
304 |
< |
if (div == NULL) |
305 |
< |
error(SYSTEM, "out of memory in doambient"); |
285 |
> |
d = 1.0; /* zeroeth order */ |
286 |
> |
/* gradient due to translation */ |
287 |
> |
for (i = 0; i < 3; i++) |
288 |
> |
d += ap->gpos[i]*(pv[i]-ap->pos[i]); |
289 |
> |
/* gradient due to rotation */ |
290 |
> |
VCOPY(v1, ap->dir); |
291 |
> |
fcross(v2, v1, nv); |
292 |
> |
d += DOT(ap->gdir, v2); |
293 |
> |
if (d <= 0.0) { |
294 |
> |
setcolor(cr, 0.0, 0.0, 0.0); |
295 |
> |
return; |
296 |
|
} |
297 |
< |
/* make axes */ |
298 |
< |
uy[0] = uy[1] = uy[2] = 0.0; |
309 |
< |
for (k = 0; k < 3; k++) |
310 |
< |
if (r->ron[k] < 0.6 && r->ron[k] > -0.6) |
311 |
< |
break; |
312 |
< |
uy[k] = 1.0; |
313 |
< |
fcross(ux, r->ron, uy); |
314 |
< |
normalize(ux); |
315 |
< |
fcross(uy, ux, r->ron); |
316 |
< |
/* set up urand */ |
317 |
< |
hlist[0] = r->rno; |
318 |
< |
/* sample divisions */ |
319 |
< |
arad = 0.0; |
320 |
< |
ne = 0; |
321 |
< |
for (i = 0; i < nt; i++) { |
322 |
< |
hlist[1] = i; |
323 |
< |
for (j = 0; j < np; j++) { |
324 |
< |
rayorigin(&ar, r, AMBIENT, 0.5); /* pretested */ |
325 |
< |
hlist[2] = j; |
326 |
< |
hlist[3] = 0; |
327 |
< |
zd = sqrt((i+urand(ilhash(hlist,4)))/nt); |
328 |
< |
hlist[3] = 1; |
329 |
< |
phi = 2.0*PI * (j+urand(ilhash(hlist,4)))/np; |
330 |
< |
xd = cos(phi) * zd; |
331 |
< |
yd = sin(phi) * zd; |
332 |
< |
zd = sqrt(1.0 - zd*zd); |
333 |
< |
for (k = 0; k < 3; k++) |
334 |
< |
ar.rdir[k] = xd*ux[k]+yd*uy[k]+zd*r->ron[k]; |
335 |
< |
dimlist[ndims++] = i*np + j + 38813; |
336 |
< |
rayvalue(&ar); |
337 |
< |
ndims--; |
338 |
< |
if (ar.rot < FHUGE) |
339 |
< |
arad += 1.0 / ar.rot; |
340 |
< |
if (ns > 0) { /* save division */ |
341 |
< |
div[ne].k = 0.0; |
342 |
< |
copycolor(div[ne].v, ar.rcol); |
343 |
< |
div[ne].n = 0; |
344 |
< |
div[ne].t = i; div[ne].p = j; |
345 |
< |
/* sum errors */ |
346 |
< |
b = bright(ar.rcol); |
347 |
< |
if (i > 0) { /* from above */ |
348 |
< |
b2 = bright(div[ne-np].v) - b; |
349 |
< |
b2 *= b2 * 0.25; |
350 |
< |
div[ne].k += b2; |
351 |
< |
div[ne].n++; |
352 |
< |
div[ne-np].k += b2; |
353 |
< |
div[ne-np].n++; |
354 |
< |
} |
355 |
< |
if (j > 0) { /* from behind */ |
356 |
< |
b2 = bright(div[ne-1].v) - b; |
357 |
< |
b2 *= b2 * 0.25; |
358 |
< |
div[ne].k += b2; |
359 |
< |
div[ne].n++; |
360 |
< |
div[ne-1].k += b2; |
361 |
< |
div[ne-1].n++; |
362 |
< |
} |
363 |
< |
if (j == np-1) { /* around */ |
364 |
< |
b2 = bright(div[ne-(np-1)].v) - b; |
365 |
< |
b2 *= b2 * 0.25; |
366 |
< |
div[ne].k += b2; |
367 |
< |
div[ne].n++; |
368 |
< |
div[ne-(np-1)].k += b2; |
369 |
< |
div[ne-(np-1)].n++; |
370 |
< |
} |
371 |
< |
ne++; |
372 |
< |
} else |
373 |
< |
addcolor(acol, ar.rcol); |
374 |
< |
} |
375 |
< |
} |
376 |
< |
for (k = 0; k < ne; k++) { /* compute errors */ |
377 |
< |
if (div[k].n > 1) |
378 |
< |
div[k].k /= div[k].n; |
379 |
< |
div[k].n = 1; |
380 |
< |
} |
381 |
< |
/* sort the divisions */ |
382 |
< |
qsort(div, ne, sizeof(AMBSAMP), ambcmp); |
383 |
< |
/* skim excess */ |
384 |
< |
while (ne > ns) { |
385 |
< |
ne--; |
386 |
< |
addcolor(acol, div[ne].v); |
387 |
< |
} |
388 |
< |
/* super-sample */ |
389 |
< |
for (i = ns; i > 0; i--) { |
390 |
< |
rayorigin(&ar, r, AMBIENT, 0.5); /* pretested */ |
391 |
< |
hlist[1] = div[0].t; |
392 |
< |
hlist[2] = div[0].p; |
393 |
< |
hlist[3] = 0; |
394 |
< |
zd = sqrt((div[0].t+urand(ilhash(hlist,4)+div[0].n))/nt); |
395 |
< |
hlist[3] = 1; |
396 |
< |
phi = 2.0*PI * (div[0].p+urand(ilhash(hlist,4)+div[0].n))/np; |
397 |
< |
xd = cos(phi) * zd; |
398 |
< |
yd = sin(phi) * zd; |
399 |
< |
zd = sqrt(1.0 - zd*zd); |
400 |
< |
for (k = 0; k < 3; k++) |
401 |
< |
ar.rdir[k] = xd*ux[k]+yd*uy[k]+zd*r->ron[k]; |
402 |
< |
dimlist[ndims++] = div[0].t*np + div[0].p + 38813; |
403 |
< |
rayvalue(&ar); |
404 |
< |
ndims--; |
405 |
< |
rayvalue(&ar); |
406 |
< |
if (ar.rot < FHUGE) |
407 |
< |
arad += 1.0 / ar.rot; |
408 |
< |
/* recompute error */ |
409 |
< |
copycolor(dnew.v, div[0].v); |
410 |
< |
addcolor(dnew.v, ar.rcol); |
411 |
< |
dnew.n = div[0].n + 1; |
412 |
< |
dnew.t = div[0].t; dnew.p = div[0].p; |
413 |
< |
b2 = bright(dnew.v)/dnew.n - bright(ar.rcol); |
414 |
< |
b2 = b2*b2 + div[0].k*(div[0].n*div[0].n); |
415 |
< |
dnew.k = b2/(dnew.n*dnew.n); |
416 |
< |
/* reinsert */ |
417 |
< |
for (k = 0; k < ne-1 && dnew.k < div[k+1].k; k++) |
418 |
< |
copystruct(&div[k], &div[k+1]); |
419 |
< |
copystruct(&div[k], &dnew); |
420 |
< |
|
421 |
< |
if (ne >= i) { /* extract darkest division */ |
422 |
< |
ne--; |
423 |
< |
if (div[ne].n > 1) |
424 |
< |
scalecolor(div[ne].v, 1.0/div[ne].n); |
425 |
< |
addcolor(acol, div[ne].v); |
426 |
< |
} |
427 |
< |
} |
428 |
< |
scalecolor(acol, 1.0/ndivs); |
429 |
< |
if (arad <= FTINY) |
430 |
< |
arad = FHUGE; |
431 |
< |
else |
432 |
< |
arad = (ndivs+ns) / arad / sqrt(r->rweight); |
433 |
< |
if (arad > maxarad) |
434 |
< |
arad = maxarad; |
435 |
< |
else if (arad < minarad) |
436 |
< |
arad = minarad; |
437 |
< |
if (ns > 0) |
438 |
< |
free((char *)div); |
439 |
< |
return(arad); |
297 |
> |
copycolor(cr, ap->val); |
298 |
> |
scalecolor(cr, d); |
299 |
|
} |
300 |
|
|
301 |
|
|
302 |
< |
static int |
303 |
< |
ambcmp(d1, d2) /* decreasing order */ |
304 |
< |
AMBSAMP *d1, *d2; |
302 |
> |
static |
303 |
> |
initambfile(creat) /* initialize ambient file */ |
304 |
> |
int creat; |
305 |
|
{ |
306 |
< |
if (d1->k < d2->k) |
307 |
< |
return(1); |
308 |
< |
if (d1->k > d2->k) |
309 |
< |
return(-1); |
310 |
< |
return(0); |
306 |
> |
extern char *progname, *octname, VersionID[]; |
307 |
> |
|
308 |
> |
#ifdef MSDOS |
309 |
> |
setmode(fileno(ambfp), O_BINARY); |
310 |
> |
#endif |
311 |
> |
setbuf(ambfp, bmalloc(BUFSIZ)); |
312 |
> |
if (creat) { /* new file */ |
313 |
> |
fprintf(ambfp, "%s -av %g %g %g -ab %d -aa %g ", |
314 |
> |
progname, colval(ambval,RED), |
315 |
> |
colval(ambval,GRN), colval(ambval,BLU), |
316 |
> |
ambounce, ambacc); |
317 |
> |
fprintf(ambfp, "-ad %d -as %d -ar %d %s\n", |
318 |
> |
ambdiv, ambssamp, ambres, |
319 |
> |
octname==NULL ? "" : octname); |
320 |
> |
fprintf(ambfp, "SOFTWARE= %s\n", VersionID); |
321 |
> |
fputformat(AMBFMT, ambfp); |
322 |
> |
putc('\n', ambfp); |
323 |
> |
putambmagic(ambfp); |
324 |
> |
} else if (checkheader(ambfp, AMBFMT, NULL) < 0 || !hasambmagic(ambfp)) |
325 |
> |
error(USER, "bad ambient file"); |
326 |
> |
ambsync(); |
327 |
|
} |
328 |
|
|
329 |
|
|
330 |
|
static |
331 |
< |
avsave(av) /* save an ambient value */ |
332 |
< |
AMBVAL *av; |
331 |
> |
avsave(av) /* insert and save an ambient value */ |
332 |
> |
AMBVAL *av; |
333 |
|
{ |
459 |
– |
#ifdef AMBFLUSH |
334 |
|
static int nunflshed = 0; |
335 |
< |
#endif |
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; |
466 |
– |
#ifdef AMBFLUSH |
341 |
|
if (++nunflshed >= AMBFLUSH) { |
342 |
< |
if (fflush(ambfp) == EOF) |
342 |
> |
if (ambsync() == EOF) |
343 |
|
goto writerr; |
344 |
|
nunflshed = 0; |
345 |
|
} |
472 |
– |
#endif |
346 |
|
return; |
347 |
|
writerr: |
348 |
|
error(SYSTEM, "error writing ambient file"); |
351 |
|
|
352 |
|
static |
353 |
|
avinsert(aval, at, c0, s) /* insert ambient value in a tree */ |
354 |
< |
AMBVAL *aval; |
354 |
> |
AMBVAL *aval; |
355 |
|
register AMBTREE *at; |
356 |
|
FVECT c0; |
357 |
< |
double s; |
357 |
> |
double s; |
358 |
|
{ |
359 |
|
FVECT ck0; |
360 |
|
int branch; |
361 |
< |
register AMBVAL *av; |
361 |
> |
register AMBVAL *av; |
362 |
|
register int i; |
363 |
|
|
364 |
|
if ((av = newambval()) == NULL) |
384 |
|
memerr: |
385 |
|
error(SYSTEM, "out of memory in avinsert"); |
386 |
|
} |
387 |
+ |
|
388 |
+ |
|
389 |
+ |
#ifdef NIX |
390 |
+ |
|
391 |
+ |
static |
392 |
+ |
ambsync() /* flush ambient file */ |
393 |
+ |
{ |
394 |
+ |
return(fflush(ambfp)); |
395 |
+ |
} |
396 |
+ |
|
397 |
+ |
#else |
398 |
+ |
|
399 |
+ |
static |
400 |
+ |
ambsync() /* synchronize ambient file */ |
401 |
+ |
{ |
402 |
+ |
static FILE *ambinp = NULL; |
403 |
+ |
static long lastpos = -1; |
404 |
+ |
struct flock fls; |
405 |
+ |
long flen; |
406 |
+ |
AMBVAL avs; |
407 |
+ |
register int n; |
408 |
+ |
/* gain exclusive access */ |
409 |
+ |
fls.l_type = F_WRLCK; |
410 |
+ |
fls.l_whence = 0; |
411 |
+ |
fls.l_start = 0L; |
412 |
+ |
fls.l_len = 0L; |
413 |
+ |
if (fcntl(fileno(ambfp), F_SETLKW, &fls) < 0) |
414 |
+ |
error(SYSTEM, "cannot lock ambient file"); |
415 |
+ |
if (lastpos < 0) /* initializing */ |
416 |
+ |
goto syncend; |
417 |
+ |
/* see if file has grown */ |
418 |
+ |
if ((flen = lseek(fileno(ambfp), 0L, 2)) < 0) |
419 |
+ |
error(SYSTEM, "cannot seek on ambient file"); |
420 |
+ |
if (n = flen - lastpos) { /* file has grown */ |
421 |
+ |
if (ambinp == NULL) { |
422 |
+ |
ambinp = fopen(ambfname, "r"); |
423 |
+ |
if (ambinp == NULL) |
424 |
+ |
error(SYSTEM, "fopen failed in ambsync"); |
425 |
+ |
} |
426 |
+ |
if (fseek(ambinp, lastpos, 0) < 0) |
427 |
+ |
error(SYSTEM, "fseek failed in ambsync"); |
428 |
+ |
while (n >= AMBVALSIZ) { /* load contributed values */ |
429 |
+ |
readambval(&avs, ambinp); |
430 |
+ |
avinsert(&avs,&atrunk,thescene.cuorg,thescene.cusize); |
431 |
+ |
n -= AMBVALSIZ; |
432 |
+ |
} |
433 |
+ |
if (n) /* alignment */ |
434 |
+ |
lseek(fileno(ambfp), flen-n, 0); |
435 |
+ |
} |
436 |
+ |
syncend: |
437 |
+ |
n = fflush(ambfp); /* calls write() at last */ |
438 |
+ |
lastpos = lseek(fileno(ambfp), 0L, 1); |
439 |
+ |
fls.l_type = F_UNLCK; /* release file */ |
440 |
+ |
fcntl(fileno(ambfp), F_SETLKW, &fls); |
441 |
+ |
return(n); |
442 |
+ |
} |
443 |
+ |
|
444 |
+ |
#endif |