1 |
< |
/* Copyright (c) 1991 Regents of the University of California */ |
1 |
> |
/* Copyright (c) 1992 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"; |
7 |
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/* |
8 |
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* ambient.c - routines dealing with ambient (inter-reflected) component. |
9 |
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* |
10 |
– |
* The macro AMBFLUSH (if defined) is the number of ambient values |
11 |
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* to wait before flushing to the ambient file. |
12 |
– |
* |
10 |
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* 5/9/86 |
11 |
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*/ |
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20 |
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|
21 |
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#include "random.h" |
22 |
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|
23 |
< |
#define OCTSCALE 0.5 /* ceil((valid rad.)/(cube size)) */ |
23 |
> |
#define OCTSCALE 0.5 /* ceil((valid rad.)/(cube size)) */ |
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|
25 |
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typedef struct ambtree { |
26 |
< |
AMBVAL *alist; /* ambient value list */ |
27 |
< |
struct ambtree *kid; /* 8 child nodes */ |
26 |
> |
AMBVAL *alist; /* ambient value list */ |
27 |
> |
struct ambtree *kid; /* 8 child nodes */ |
28 |
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} AMBTREE; /* ambient octree */ |
29 |
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|
30 |
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extern CUBE thescene; /* contains space boundaries */ |
31 |
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|
32 |
< |
#define MAXASET 511 /* maximum number of elements in ambient set */ |
33 |
< |
OBJECT ambset[MAXASET+1]={0}; /* ambient include/exclude set */ |
32 |
> |
#define MAXASET 511 /* maximum number of elements in ambient set */ |
33 |
> |
OBJECT ambset[MAXASET+1]={0}; /* ambient include/exclude set */ |
34 |
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|
35 |
< |
double maxarad; /* maximum ambient radius */ |
36 |
< |
double minarad; /* minimum ambient radius */ |
35 |
> |
double maxarad; /* maximum ambient radius */ |
36 |
> |
double minarad; /* minimum ambient radius */ |
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|
38 |
< |
static AMBTREE atrunk; /* our ambient trunk node */ |
38 |
> |
static AMBTREE atrunk; /* our ambient trunk node */ |
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|
40 |
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static FILE *ambfp = NULL; /* ambient file pointer */ |
41 |
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|
42 |
< |
#define newambval() (AMBVAL *)bmalloc(sizeof(AMBVAL)) |
42 |
> |
#define AMBFLUSH (BUFSIZ/AMBVALSIZ) |
43 |
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|
44 |
< |
#define newambtree() (AMBTREE *)calloc(8, sizeof(AMBTREE)) |
44 |
> |
#define newambval() (AMBVAL *)bmalloc(sizeof(AMBVAL)) |
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|
46 |
+ |
#define newambtree() (AMBTREE *)calloc(8, sizeof(AMBTREE)) |
47 |
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|
48 |
< |
setambient(afile) /* initialize calculation */ |
49 |
< |
char *afile; |
48 |
> |
extern long ftell(), lseek(); |
49 |
> |
static int initambfile(), avsave(), avinsert(), ambsync(); |
50 |
> |
|
51 |
> |
|
52 |
> |
setambres(ar) /* set ambient resolution */ |
53 |
> |
int ar; |
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{ |
55 |
< |
long ftell(); |
56 |
< |
AMBVAL amb; |
55 |
> |
/* set min & max radii */ |
56 |
> |
if (ar <= 0) { |
57 |
> |
minarad = 0.0; |
58 |
> |
maxarad = thescene.cusize / 2.0; |
59 |
> |
} else { |
60 |
> |
minarad = thescene.cusize / ar; |
61 |
> |
maxarad = 16.0 * minarad; /* heuristic */ |
62 |
> |
if (maxarad > thescene.cusize / 2.0) |
63 |
> |
maxarad = thescene.cusize / 2.0; |
64 |
> |
} |
65 |
> |
if (maxarad <= FTINY) |
66 |
> |
maxarad = .001; |
67 |
> |
} |
68 |
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|
56 |
– |
maxarad = thescene.cusize / 2.0; /* maximum radius */ |
57 |
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/* minimum radius */ |
58 |
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minarad = ambres > 0 ? thescene.cusize/ambres : 0.0; |
69 |
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|
70 |
< |
/* open ambient file */ |
70 |
> |
setambient(afile) /* initialize calculation */ |
71 |
> |
char *afile; |
72 |
> |
{ |
73 |
> |
long headlen; |
74 |
> |
AMBVAL amb; |
75 |
> |
/* init ambient limits */ |
76 |
> |
setambres(ambres); |
77 |
> |
/* open ambient file */ |
78 |
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if (afile != NULL) |
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if ((ambfp = fopen(afile, "r+")) != NULL) { |
80 |
< |
while (fread((char *)&amb,sizeof(AMBVAL),1,ambfp) == 1) |
80 |
> |
initambfile(0); |
81 |
> |
headlen = ftell(ambfp); |
82 |
> |
while (readambval(&amb, ambfp)) |
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avinsert(&amb, &atrunk, thescene.cuorg, |
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thescene.cusize); |
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/* align */ |
86 |
< |
fseek(ambfp, -(ftell(ambfp)%sizeof(AMBVAL)), 1); |
87 |
< |
} else if ((ambfp = fopen(afile, "w")) == NULL) { |
86 |
> |
fseek(ambfp, -((ftell(ambfp)-headlen)%AMBVALSIZ), 1); |
87 |
> |
} else if ((ambfp = fopen(afile, "w+")) != NULL) |
88 |
> |
initambfile(1); |
89 |
> |
else { |
90 |
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sprintf(errmsg, "cannot open ambient file \"%s\"", |
91 |
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afile); |
92 |
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error(SYSTEM, errmsg); |
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|
96 |
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|
97 |
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ambnotify(obj) /* record new modifier */ |
98 |
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OBJECT obj; |
98 |
> |
OBJECT obj; |
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{ |
100 |
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static int hitlimit = 0; |
101 |
< |
register OBJREC *o = objptr(obj); |
101 |
> |
register OBJREC *o = objptr(obj); |
102 |
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register char **amblp; |
103 |
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|
104 |
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if (hitlimit || !ismodifier(o->otype)) |
121 |
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register RAY *r; |
122 |
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{ |
123 |
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static int rdepth = 0; /* ambient recursion */ |
124 |
< |
double wsum; |
124 |
> |
double d; |
125 |
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|
105 |
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rdepth++; /* increment level */ |
106 |
– |
|
126 |
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if (ambdiv <= 0) /* no ambient calculation */ |
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goto dumbamb; |
128 |
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/* check number of bounces */ |
129 |
< |
if (rdepth > ambounce) |
129 |
> |
if (rdepth >= ambounce) |
130 |
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goto dumbamb; |
131 |
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/* check ambient list */ |
132 |
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if (ambincl != -1 && r->ro != NULL && |
134 |
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goto dumbamb; |
135 |
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|
136 |
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if (ambacc <= FTINY) { /* no ambient storage */ |
137 |
< |
if (doambient(acol, r, NULL, NULL) == 0.0) |
137 |
> |
rdepth++; |
138 |
> |
d = doambient(acol, r, r->rweight, NULL, NULL); |
139 |
> |
rdepth--; |
140 |
> |
if (d == 0.0) |
141 |
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goto dumbamb; |
142 |
< |
goto done; |
142 |
> |
return; |
143 |
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} |
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/* get ambient value */ |
145 |
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setcolor(acol, 0.0, 0.0, 0.0); |
146 |
< |
wsum = sumambient(acol, r, &atrunk, thescene.cuorg, thescene.cusize); |
147 |
< |
if (wsum > FTINY) |
148 |
< |
scalecolor(acol, 1.0/wsum); |
149 |
< |
else if (makeambient(acol, r) == 0.0) |
150 |
< |
goto dumbamb; |
151 |
< |
goto done; |
152 |
< |
|
146 |
> |
d = sumambient(acol, r, rdepth, |
147 |
> |
&atrunk, thescene.cuorg, thescene.cusize); |
148 |
> |
if (d > FTINY) |
149 |
> |
scalecolor(acol, 1.0/d); |
150 |
> |
else { |
151 |
> |
d = makeambient(acol, r, rdepth++); |
152 |
> |
rdepth--; |
153 |
> |
} |
154 |
> |
if (d > FTINY) |
155 |
> |
return; |
156 |
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dumbamb: /* return global value */ |
157 |
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copycolor(acol, ambval); |
133 |
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done: /* must finish here! */ |
134 |
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rdepth--; |
158 |
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} |
159 |
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|
160 |
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|
161 |
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double |
162 |
< |
sumambient(acol, r, at, c0, s) /* get interpolated ambient value */ |
162 |
> |
sumambient(acol, r, al, at, c0, s) /* get interpolated ambient value */ |
163 |
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COLOR acol; |
164 |
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register RAY *r; |
165 |
< |
AMBTREE *at; |
165 |
> |
int al; |
166 |
> |
AMBTREE *at; |
167 |
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FVECT c0; |
168 |
< |
double s; |
168 |
> |
double s; |
169 |
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{ |
170 |
< |
extern double sqrt(); |
147 |
< |
double d, e1, e2, wt, wsum; |
170 |
> |
double d, e1, e2, wt, wsum; |
171 |
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COLOR ct; |
172 |
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FVECT ck0; |
173 |
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int i; |
174 |
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register int j; |
175 |
< |
register AMBVAL *av; |
175 |
> |
register AMBVAL *av; |
176 |
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/* do this node */ |
177 |
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wsum = 0.0; |
178 |
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for (av = at->alist; av != NULL; av = av->next) { |
179 |
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/* |
180 |
< |
* Ray strength test. |
180 |
> |
* Ambient level test. |
181 |
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*/ |
182 |
< |
if (av->lvl > r->rlvl || av->weight < r->rweight-FTINY) |
182 |
> |
if (av->lvl > al || av->weight < r->rweight-FTINY) |
183 |
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continue; |
184 |
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/* |
185 |
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* Ambient radius test. |
206 |
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for (j = 0; j < 3; j++) |
207 |
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d += (r->rop[j] - av->pos[j]) * |
208 |
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(av->dir[j] + r->ron[j]); |
209 |
< |
if (d*0.5 < -minarad*ambacc) |
209 |
> |
if (d*0.5 < -minarad*ambacc-.001) |
210 |
|
continue; |
211 |
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/* |
212 |
|
* Jittering final test reduces image artifacts. |
213 |
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*/ |
214 |
|
wt = sqrt(e1) + sqrt(e2); |
215 |
< |
wt *= .9 + .2*frandom(); |
215 |
> |
wt *= .9 + .2*urand(9015+samplendx); |
216 |
|
if (wt > ambacc) |
217 |
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continue; |
218 |
|
if (wt <= 1e-3) |
220 |
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else |
221 |
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wt = 1.0 / wt; |
222 |
|
wsum += wt; |
223 |
< |
copycolor(ct, av->val); |
223 |
> |
extambient(ct, av, r->rop, r->ron); |
224 |
|
scalecolor(ct, wt); |
225 |
|
addcolor(acol, ct); |
226 |
|
} |
239 |
|
break; |
240 |
|
} |
241 |
|
if (j == 3) |
242 |
< |
wsum += sumambient(acol, r, at->kid+i, ck0, s); |
242 |
> |
wsum += sumambient(acol, r, al, at->kid+i, ck0, s); |
243 |
|
} |
244 |
|
return(wsum); |
245 |
|
} |
246 |
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|
247 |
|
|
248 |
|
double |
249 |
< |
makeambient(acol, r) /* make a new ambient value */ |
249 |
> |
makeambient(acol, r, al) /* make a new ambient value */ |
250 |
|
COLOR acol; |
251 |
|
register RAY *r; |
252 |
+ |
int al; |
253 |
|
{ |
254 |
< |
AMBVAL amb; |
254 |
> |
AMBVAL amb; |
255 |
|
FVECT gp, gd; |
256 |
< |
|
257 |
< |
amb.rad = doambient(acol, r, gp, gd); /* compute ambient */ |
256 |
> |
/* compute weight */ |
257 |
> |
amb.weight = pow(AVGREFL, (double)al); |
258 |
> |
if (r->rweight < 0.2*amb.weight) /* heuristic */ |
259 |
> |
amb.weight = r->rweight; |
260 |
> |
/* compute ambient */ |
261 |
> |
amb.rad = doambient(acol, r, amb.weight, gp, gd); |
262 |
|
if (amb.rad == 0.0) |
263 |
|
return(0.0); |
264 |
|
/* store it */ |
265 |
|
VCOPY(amb.pos, r->rop); |
266 |
|
VCOPY(amb.dir, r->ron); |
267 |
< |
amb.lvl = r->rlvl; |
240 |
< |
amb.weight = r->rweight; |
267 |
> |
amb.lvl = al; |
268 |
|
copycolor(amb.val, acol); |
269 |
|
VCOPY(amb.gpos, gp); |
270 |
|
VCOPY(amb.gdir, gd); |
271 |
|
/* insert into tree */ |
272 |
< |
avinsert(&amb, &atrunk, thescene.cuorg, thescene.cusize); |
246 |
< |
avsave(&amb); /* write to file */ |
272 |
> |
avsave(&amb); /* and save to file */ |
273 |
|
return(amb.rad); |
274 |
|
} |
275 |
|
|
276 |
|
|
277 |
+ |
extambient(cr, ap, pv, nv) /* extrapolate value at pv, nv */ |
278 |
+ |
COLOR cr; |
279 |
+ |
register AMBVAL *ap; |
280 |
+ |
FVECT pv, nv; |
281 |
+ |
{ |
282 |
+ |
FVECT v1, v2; |
283 |
+ |
register int i; |
284 |
+ |
double d; |
285 |
+ |
|
286 |
+ |
d = 1.0; /* zeroeth order */ |
287 |
+ |
/* gradient due to translation */ |
288 |
+ |
for (i = 0; i < 3; i++) |
289 |
+ |
d += ap->gpos[i]*(pv[i]-ap->pos[i]); |
290 |
+ |
/* gradient due to rotation */ |
291 |
+ |
VCOPY(v1, ap->dir); |
292 |
+ |
fcross(v2, v1, nv); |
293 |
+ |
d += DOT(ap->gdir, v2); |
294 |
+ |
if (d <= 0.0) { |
295 |
+ |
setcolor(cr, 0.0, 0.0, 0.0); |
296 |
+ |
return; |
297 |
+ |
} |
298 |
+ |
copycolor(cr, ap->val); |
299 |
+ |
scalecolor(cr, d); |
300 |
+ |
} |
301 |
+ |
|
302 |
+ |
|
303 |
|
static |
304 |
< |
avsave(av) /* save an ambient value */ |
305 |
< |
AMBVAL *av; |
304 |
> |
initambfile(creat) /* initialize ambient file */ |
305 |
> |
int creat; |
306 |
|
{ |
307 |
< |
#ifdef AMBFLUSH |
308 |
< |
static int nunflshed = 0; |
307 |
> |
extern char *progname, *octname, VersionID[]; |
308 |
> |
|
309 |
> |
#ifdef MSDOS |
310 |
> |
setmode(fileno(ambfp), O_BINARY); |
311 |
|
#endif |
312 |
+ |
setbuf(ambfp, bmalloc(BUFSIZ)); |
313 |
+ |
if (creat) { /* new file */ |
314 |
+ |
fprintf(ambfp, "%s -av %g %g %g -ab %d -aa %g ", |
315 |
+ |
progname, colval(ambval,RED), |
316 |
+ |
colval(ambval,GRN), colval(ambval,BLU), |
317 |
+ |
ambounce, ambacc); |
318 |
+ |
fprintf(ambfp, "-ad %d -as %d -ar %d %s\n", |
319 |
+ |
ambdiv, ambssamp, ambres, |
320 |
+ |
octname==NULL ? "" : octname); |
321 |
+ |
fprintf(ambfp, "SOFTWARE= %s\n", VersionID); |
322 |
+ |
fputformat(AMBFMT, ambfp); |
323 |
+ |
putc('\n', ambfp); |
324 |
+ |
putambmagic(ambfp); |
325 |
+ |
fflush(ambfp); |
326 |
+ |
#ifndef NIX |
327 |
+ |
sync(); /* protect against NFS buffering */ |
328 |
+ |
#endif |
329 |
+ |
} else if (checkheader(ambfp, AMBFMT, NULL) < 0 || !hasambmagic(ambfp)) |
330 |
+ |
error(USER, "bad ambient file"); |
331 |
+ |
} |
332 |
+ |
|
333 |
+ |
|
334 |
+ |
static |
335 |
+ |
avsave(av) /* insert and save an ambient value */ |
336 |
+ |
AMBVAL *av; |
337 |
+ |
{ |
338 |
+ |
static int nunflshed = 0; |
339 |
+ |
|
340 |
+ |
avinsert(av, &atrunk, thescene.cuorg, thescene.cusize); |
341 |
|
if (ambfp == NULL) |
342 |
|
return; |
343 |
< |
if (fwrite((char *)av, sizeof(AMBVAL), 1, ambfp) != 1) |
343 |
> |
if (writambval(av, ambfp) < 0) |
344 |
|
goto writerr; |
262 |
– |
#ifdef AMBFLUSH |
345 |
|
if (++nunflshed >= AMBFLUSH) { |
346 |
< |
if (fflush(ambfp) == EOF) |
346 |
> |
if (ambsync() == EOF) |
347 |
|
goto writerr; |
348 |
|
nunflshed = 0; |
349 |
|
} |
268 |
– |
#endif |
350 |
|
return; |
351 |
|
writerr: |
352 |
|
error(SYSTEM, "error writing ambient file"); |
355 |
|
|
356 |
|
static |
357 |
|
avinsert(aval, at, c0, s) /* insert ambient value in a tree */ |
358 |
< |
AMBVAL *aval; |
358 |
> |
AMBVAL *aval; |
359 |
|
register AMBTREE *at; |
360 |
|
FVECT c0; |
361 |
< |
double s; |
361 |
> |
double s; |
362 |
|
{ |
363 |
|
FVECT ck0; |
364 |
|
int branch; |
365 |
< |
register AMBVAL *av; |
365 |
> |
register AMBVAL *av; |
366 |
|
register int i; |
367 |
|
|
368 |
|
if ((av = newambval()) == NULL) |
388 |
|
memerr: |
389 |
|
error(SYSTEM, "out of memory in avinsert"); |
390 |
|
} |
391 |
+ |
|
392 |
+ |
|
393 |
+ |
#ifdef NIX |
394 |
+ |
|
395 |
+ |
static |
396 |
+ |
ambsync() /* flush ambient file */ |
397 |
+ |
{ |
398 |
+ |
return(fflush(ambfp)); |
399 |
+ |
} |
400 |
+ |
|
401 |
+ |
#else |
402 |
+ |
|
403 |
+ |
#include <fcntl.h> |
404 |
+ |
#include <sys/types.h> |
405 |
+ |
#include <sys/stat.h> |
406 |
+ |
|
407 |
+ |
static |
408 |
+ |
ambsync() /* synchronize ambient file */ |
409 |
+ |
{ |
410 |
+ |
static FILE *ambinp = NULL; |
411 |
+ |
struct flock fls; |
412 |
+ |
struct stat sts; |
413 |
+ |
AMBVAL avs; |
414 |
+ |
long lastpos, flen; |
415 |
+ |
register int n; |
416 |
+ |
/* gain exclusive access */ |
417 |
+ |
fls.l_type = F_WRLCK; |
418 |
+ |
fls.l_whence = 0; |
419 |
+ |
fls.l_start = 0L; |
420 |
+ |
fls.l_len = 0L; |
421 |
+ |
if (fcntl(fileno(ambfp), F_SETLKW, &fls) < 0) |
422 |
+ |
error(SYSTEM, "cannot lock ambient file"); |
423 |
+ |
/* see if file has grown */ |
424 |
+ |
lastpos = lseek(fileno(ambfp), 0L, 1); /* get previous position */ |
425 |
+ |
if (fstat(fileno(ambfp), &sts) < 0) /* get current length */ |
426 |
+ |
error(SYSTEM, "cannot stat ambient file"); |
427 |
+ |
flen = sts.st_size; |
428 |
+ |
if (n = (flen - lastpos)/AMBVALSIZ) { /* file has grown */ |
429 |
+ |
if (ambinp == NULL) /* use duplicate file */ |
430 |
+ |
ambinp = fdopen(dup(fileno(ambfp)), "r"); |
431 |
+ |
while (n--) { /* load contributed values */ |
432 |
+ |
readambval(&avs, ambinp); |
433 |
+ |
avinsert(&avs,&atrunk,thescene.cuorg,thescene.cusize); |
434 |
+ |
} /* moves shared file pointer */ |
435 |
+ |
if (n = (flen - lastpos)%AMBVALSIZ) /* alignment */ |
436 |
+ |
lseek(fileno(ambfp), flen-n, 0); |
437 |
+ |
} |
438 |
+ |
n = fflush(ambfp); /* calls write() at last */ |
439 |
+ |
fls.l_type = F_UNLCK; /* release file */ |
440 |
+ |
fcntl(fileno(ambfp), F_SETLKW, &fls); |
441 |
+ |
return(n); |
442 |
+ |
} |
443 |
+ |
|
444 |
+ |
#endif |