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/* Copyright (c) 1986 Regents of the University of California */ |
1 |
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/* Copyright (c) 1993 Regents of the University of California */ |
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#ifndef lint |
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static char SCCSid[] = "$SunId$ LBL"; |
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|
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/* |
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* ambient.c - routines dealing with ambient (inter-reflected) component. |
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* |
10 |
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* The macro AMBFLUSH (if defined) is the number of ambient values |
11 |
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* to wait before flushing to the ambient file. |
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* |
13 |
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* 5/9/86 |
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*/ |
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|
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#include "ray.h" |
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|
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#include "octree.h" |
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|
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#include "otypes.h" |
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|
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#include "ambient.h" |
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|
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#include "random.h" |
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|
21 |
< |
#define OCTSCALE 0.5 /* ceil((valid rad.)/(cube size)) */ |
21 |
> |
#define OCTSCALE 0.5 /* ceil((valid rad.)/(cube size)) */ |
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|
23 |
+ |
typedef struct ambtree { |
24 |
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AMBVAL *alist; /* ambient value list */ |
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struct ambtree *kid; /* 8 child nodes */ |
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} AMBTREE; /* ambient octree */ |
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|
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extern CUBE thescene; /* contains space boundaries */ |
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|
30 |
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extern COLOR ambval; /* global ambient component */ |
31 |
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extern double ambacc; /* ambient accuracy */ |
28 |
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extern int ambres; /* ambient resolution */ |
29 |
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extern int ambdiv; /* number of divisions for calculation */ |
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extern int ambssamp; /* number of super-samples */ |
31 |
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extern int ambounce; /* number of ambient bounces */ |
32 |
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extern char *amblist[]; /* ambient include/exclude list */ |
33 |
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extern int ambincl; /* include == 1, exclude == 0 */ |
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#define MAXASET 511 /* maximum number of elements in ambient set */ |
31 |
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OBJECT ambset[MAXASET+1]={0}; /* ambient include/exclude set */ |
32 |
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|
33 |
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OBJECT ambset[128]; /* ambient include/exclude set */ |
33 |
> |
double maxarad; /* maximum ambient radius */ |
34 |
> |
double minarad; /* minimum ambient radius */ |
35 |
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|
36 |
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double maxarad; /* maximum ambient radius */ |
38 |
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double minarad; /* minimum ambient radius */ |
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static AMBTREE atrunk; /* our ambient trunk node */ |
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|
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typedef struct ambval { |
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FVECT pos; /* position in space */ |
42 |
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FVECT dir; /* normal direction */ |
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int lvl; /* recursion level of parent ray */ |
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float weight; /* weight of parent ray */ |
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COLOR val; /* computed ambient value */ |
46 |
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float rad; /* validity radius */ |
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struct ambval *next; /* next in list */ |
48 |
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} AMBVAL; /* ambient value */ |
38 |
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static FILE *ambfp = NULL; /* ambient file pointer */ |
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static int nunflshed = 0; /* number of unflushed ambient values */ |
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|
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typedef struct ambtree { |
51 |
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AMBVAL *alist; /* ambient value list */ |
52 |
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struct ambtree *kid; /* 8 child nodes */ |
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} AMBTREE; /* ambient octree */ |
41 |
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#define AMBFLUSH (BUFSIZ/AMBVALSIZ) |
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|
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typedef struct { |
56 |
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float k; /* error contribution per sample */ |
57 |
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COLOR v; /* ray sum */ |
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int n; /* number of samples */ |
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short t, p; /* theta, phi indices */ |
60 |
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} AMBSAMP; /* ambient sample */ |
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#define newambval() (AMBVAL *)bmalloc(sizeof(AMBVAL)) |
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|
45 |
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static AMBTREE atrunk; /* our ambient trunk node */ |
45 |
> |
#define newambtree() (AMBTREE *)calloc(8, sizeof(AMBTREE)) |
46 |
> |
#define freeambtree(t) free((char *)(t)) |
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|
48 |
< |
static FILE *ambfp = NULL; /* ambient file pointer */ |
48 |
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extern long ftell(), lseek(); |
49 |
> |
static int initambfile(), avsave(), avinsert(), loadatree(); |
50 |
> |
static AMBVAL *avstore(); |
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> |
#ifdef F_SETLKW |
52 |
> |
static aflock(); |
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#endif |
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|
66 |
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#define newambval() (AMBVAL *)bmalloc(sizeof(AMBVAL)) |
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|
56 |
< |
#define newambtree() (AMBTREE *)calloc(8, sizeof(AMBTREE)) |
56 |
> |
setambres(ar) /* set ambient resolution */ |
57 |
> |
int ar; |
58 |
> |
{ |
59 |
> |
ambres = ar < 0 ? 0 : ar; /* may be done already */ |
60 |
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/* set min & max radii */ |
61 |
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if (ar <= 0) { |
62 |
> |
minarad = 0.0; |
63 |
> |
maxarad = thescene.cusize / 2.0; |
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} else { |
65 |
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minarad = thescene.cusize / ar; |
66 |
> |
maxarad = 16.0 * minarad; /* heuristic */ |
67 |
> |
if (maxarad > thescene.cusize / 2.0) |
68 |
> |
maxarad = thescene.cusize / 2.0; |
69 |
> |
} |
70 |
> |
if (maxarad <= FTINY) |
71 |
> |
maxarad = .001; |
72 |
> |
} |
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|
70 |
– |
double sumambient(), doambient(), makeambient(); |
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|
75 |
+ |
setambacc(newa) /* set ambient accuracy */ |
76 |
+ |
double newa; |
77 |
+ |
{ |
78 |
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static double oldambacc = -1.0; |
79 |
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AMBTREE oldatrunk; |
80 |
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|
81 |
+ |
ambacc = newa < 0.0 ? 0.0 : newa; /* may be done already */ |
82 |
+ |
if (oldambacc < -FTINY) |
83 |
+ |
oldambacc = ambacc; /* do nothing first call */ |
84 |
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if (fabs(newa - oldambacc) < 0.01) |
85 |
+ |
return; /* insignificant -- don't bother */ |
86 |
+ |
if (ambacc <= FTINY) |
87 |
+ |
return; /* cannot build new tree */ |
88 |
+ |
/* else need to rebuild tree */ |
89 |
+ |
copystruct(&oldatrunk, &atrunk); |
90 |
+ |
atrunk.alist = NULL; |
91 |
+ |
atrunk.kid = NULL; |
92 |
+ |
loadatree(&oldatrunk); |
93 |
+ |
oldambacc = ambacc; /* remeber setting for next call */ |
94 |
+ |
} |
95 |
+ |
|
96 |
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|
97 |
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setambient(afile) /* initialize calculation */ |
98 |
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char *afile; |
99 |
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{ |
100 |
< |
long ftell(); |
101 |
< |
char **amblp; |
102 |
< |
OBJECT obj; |
103 |
< |
AMBVAL amb; |
104 |
< |
/* set up ambient set */ |
105 |
< |
ambset[0] = 0; |
106 |
< |
for (amblp = amblist; *amblp != NULL; amblp++) { |
107 |
< |
if ((obj = modifier(*amblp)) == OVOID) { |
108 |
< |
sprintf(errmsg, "unknown %s modifier \"%s\"", |
109 |
< |
ambincl ? "include" : "exclude", *amblp); |
110 |
< |
error(WARNING, errmsg); |
111 |
< |
continue; |
88 |
< |
} |
89 |
< |
if (!inset(ambset, obj)) |
90 |
< |
insertelem(ambset, obj); |
100 |
> |
long headlen; |
101 |
> |
AMBVAL amb; |
102 |
> |
/* init ambient limits */ |
103 |
> |
setambres(ambres); |
104 |
> |
setambacc(ambacc); |
105 |
> |
if (afile == NULL) |
106 |
> |
return; |
107 |
> |
if (ambacc <= FTINY) { |
108 |
> |
sprintf(errmsg, "zero ambient accuracy so \"%s\" not opened", |
109 |
> |
afile); |
110 |
> |
error(WARNING, errmsg); |
111 |
> |
return; |
112 |
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} |
113 |
< |
maxarad = thescene.cusize / 2.0; /* maximum radius */ |
114 |
< |
/* minimum radius */ |
115 |
< |
minarad = ambres > 0 ? thescene.cusize/ambres : 0.0; |
113 |
> |
/* open ambient file */ |
114 |
> |
if ((ambfp = fopen(afile, "r+")) != NULL) { |
115 |
> |
initambfile(0); |
116 |
> |
headlen = ftell(ambfp); |
117 |
> |
while (readambval(&amb, ambfp)) |
118 |
> |
avinsert(avstore(&amb)); |
119 |
> |
/* align */ |
120 |
> |
fseek(ambfp, -((ftell(ambfp)-headlen)%AMBVALSIZ), 1); |
121 |
> |
} else if ((ambfp = fopen(afile, "w+")) != NULL) |
122 |
> |
initambfile(1); |
123 |
> |
else { |
124 |
> |
sprintf(errmsg, "cannot open ambient file \"%s\"", afile); |
125 |
> |
error(SYSTEM, errmsg); |
126 |
> |
} |
127 |
> |
nunflshed++; /* lie */ |
128 |
> |
ambsync(); |
129 |
> |
} |
130 |
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|
131 |
< |
/* open ambient file */ |
132 |
< |
if (afile != NULL) |
133 |
< |
if ((ambfp = fopen(afile, "r+")) != NULL) { |
134 |
< |
while (fread(&amb, sizeof(AMBVAL), 1, ambfp) == 1) |
135 |
< |
avinsert(&amb, &atrunk, thescene.cuorg, |
136 |
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thescene.cusize); |
137 |
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/* align */ |
138 |
< |
fseek(ambfp, -(ftell(ambfp)%sizeof(AMBVAL)), 1); |
139 |
< |
} else if ((ambfp = fopen(afile, "w")) == NULL) { |
140 |
< |
sprintf(errmsg, "cannot open ambient file \"%s\"", |
141 |
< |
afile); |
142 |
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error(SYSTEM, errmsg); |
131 |
> |
|
132 |
> |
ambnotify(obj) /* record new modifier */ |
133 |
> |
OBJECT obj; |
134 |
> |
{ |
135 |
> |
static int hitlimit = 0; |
136 |
> |
register OBJREC *o = objptr(obj); |
137 |
> |
register char **amblp; |
138 |
> |
|
139 |
> |
if (hitlimit || !ismodifier(o->otype)) |
140 |
> |
return; |
141 |
> |
for (amblp = amblist; *amblp != NULL; amblp++) |
142 |
> |
if (!strcmp(o->oname, *amblp)) { |
143 |
> |
if (ambset[0] >= MAXASET) { |
144 |
> |
error(WARNING, "too many modifiers in ambient list"); |
145 |
> |
hitlimit++; |
146 |
> |
return; /* should this be fatal? */ |
147 |
> |
} |
148 |
> |
insertelem(ambset, obj); |
149 |
> |
return; |
150 |
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} |
151 |
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} |
152 |
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|
156 |
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register RAY *r; |
157 |
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{ |
158 |
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static int rdepth = 0; /* ambient recursion */ |
159 |
< |
double wsum; |
159 |
> |
double d; |
160 |
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|
119 |
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rdepth++; /* increment level */ |
120 |
– |
|
161 |
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if (ambdiv <= 0) /* no ambient calculation */ |
162 |
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goto dumbamb; |
163 |
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/* check number of bounces */ |
164 |
< |
if (rdepth > ambounce) |
164 |
> |
if (rdepth >= ambounce) |
165 |
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goto dumbamb; |
166 |
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/* check ambient list */ |
167 |
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if (ambincl != -1 && r->ro != NULL && |
169 |
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goto dumbamb; |
170 |
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|
171 |
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if (ambacc <= FTINY) { /* no ambient storage */ |
172 |
< |
if (doambient(acol, r) == 0.0) |
172 |
> |
rdepth++; |
173 |
> |
d = doambient(acol, r, r->rweight, NULL, NULL); |
174 |
> |
rdepth--; |
175 |
> |
if (d == 0.0) |
176 |
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goto dumbamb; |
177 |
< |
goto done; |
177 |
> |
return; |
178 |
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} |
179 |
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/* get ambient value */ |
180 |
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setcolor(acol, 0.0, 0.0, 0.0); |
181 |
< |
wsum = sumambient(acol, r, &atrunk, thescene.cuorg, thescene.cusize); |
182 |
< |
if (wsum > FTINY) |
183 |
< |
scalecolor(acol, 1.0/wsum); |
184 |
< |
else if (makeambient(acol, r) == 0.0) |
185 |
< |
goto dumbamb; |
186 |
< |
goto done; |
187 |
< |
|
181 |
> |
d = sumambient(acol, r, rdepth, |
182 |
> |
&atrunk, thescene.cuorg, thescene.cusize); |
183 |
> |
if (d > FTINY) |
184 |
> |
scalecolor(acol, 1.0/d); |
185 |
> |
else { |
186 |
> |
d = makeambient(acol, r, rdepth++); |
187 |
> |
rdepth--; |
188 |
> |
} |
189 |
> |
if (d > FTINY) |
190 |
> |
return; |
191 |
|
dumbamb: /* return global value */ |
192 |
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copycolor(acol, ambval); |
147 |
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done: /* must finish here! */ |
148 |
– |
rdepth--; |
193 |
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} |
194 |
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|
195 |
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|
196 |
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double |
197 |
< |
sumambient(acol, r, at, c0, s) /* get interpolated ambient value */ |
197 |
> |
sumambient(acol, r, al, at, c0, s) /* get interpolated ambient value */ |
198 |
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COLOR acol; |
199 |
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register RAY *r; |
200 |
< |
AMBTREE *at; |
200 |
> |
int al; |
201 |
> |
AMBTREE *at; |
202 |
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FVECT c0; |
203 |
< |
double s; |
203 |
> |
double s; |
204 |
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{ |
205 |
< |
extern double sqrt(); |
161 |
< |
double d, e1, e2, wt, wsum; |
205 |
> |
double d, e1, e2, wt, wsum; |
206 |
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COLOR ct; |
207 |
|
FVECT ck0; |
208 |
|
int i; |
209 |
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register int j; |
210 |
< |
register AMBVAL *av; |
210 |
> |
register AMBVAL *av; |
211 |
|
/* do this node */ |
212 |
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wsum = 0.0; |
213 |
|
for (av = at->alist; av != NULL; av = av->next) { |
214 |
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/* |
215 |
< |
* Ray strength test. |
215 |
> |
* Ambient level test. |
216 |
|
*/ |
217 |
< |
if (av->lvl > r->rlvl || av->weight < r->rweight-FTINY) |
217 |
> |
if (av->lvl > al || av->weight < r->rweight-FTINY) |
218 |
|
continue; |
219 |
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/* |
220 |
|
* Ambient radius test. |
241 |
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for (j = 0; j < 3; j++) |
242 |
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d += (r->rop[j] - av->pos[j]) * |
243 |
|
(av->dir[j] + r->ron[j]); |
244 |
< |
if (d < -minarad) |
244 |
> |
if (d*0.5 < -minarad*ambacc-.001) |
245 |
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continue; |
246 |
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/* |
247 |
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* Jittering final test reduces image artifacts. |
248 |
|
*/ |
249 |
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wt = sqrt(e1) + sqrt(e2); |
250 |
< |
if (wt > ambacc*(0.9 + 0.2*frandom())) |
250 |
> |
wt *= .9 + .2*urand(9015+samplendx); |
251 |
> |
if (wt > ambacc) |
252 |
|
continue; |
253 |
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if (wt <= 1e-3) |
254 |
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wt = 1e3; |
255 |
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else |
256 |
|
wt = 1.0 / wt; |
257 |
|
wsum += wt; |
258 |
< |
copycolor(ct, av->val); |
258 |
> |
extambient(ct, av, r->rop, r->ron); |
259 |
|
scalecolor(ct, wt); |
260 |
|
addcolor(acol, ct); |
261 |
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} |
274 |
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break; |
275 |
|
} |
276 |
|
if (j == 3) |
277 |
< |
wsum += sumambient(acol, r, at->kid+i, ck0, s); |
277 |
> |
wsum += sumambient(acol, r, al, at->kid+i, ck0, s); |
278 |
|
} |
279 |
|
return(wsum); |
280 |
|
} |
281 |
|
|
282 |
|
|
283 |
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double |
284 |
< |
makeambient(acol, r) /* make a new ambient value */ |
284 |
> |
makeambient(acol, r, al) /* make a new ambient value */ |
285 |
|
COLOR acol; |
286 |
|
register RAY *r; |
287 |
+ |
int al; |
288 |
|
{ |
289 |
< |
AMBVAL amb; |
290 |
< |
|
291 |
< |
amb.rad = doambient(acol, r); /* compute ambient */ |
289 |
> |
AMBVAL amb; |
290 |
> |
FVECT gp, gd; |
291 |
> |
/* compute weight */ |
292 |
> |
amb.weight = pow(AVGREFL, (double)al); |
293 |
> |
if (r->rweight < 0.2*amb.weight) /* heuristic */ |
294 |
> |
amb.weight = r->rweight; |
295 |
> |
/* compute ambient */ |
296 |
> |
amb.rad = doambient(acol, r, amb.weight, gp, gd); |
297 |
|
if (amb.rad == 0.0) |
298 |
|
return(0.0); |
299 |
|
/* store it */ |
300 |
|
VCOPY(amb.pos, r->rop); |
301 |
|
VCOPY(amb.dir, r->ron); |
302 |
< |
amb.lvl = r->rlvl; |
252 |
< |
amb.weight = r->rweight; |
302 |
> |
amb.lvl = al; |
303 |
|
copycolor(amb.val, acol); |
304 |
+ |
VCOPY(amb.gpos, gp); |
305 |
+ |
VCOPY(amb.gdir, gd); |
306 |
|
/* insert into tree */ |
307 |
< |
avinsert(&amb, &atrunk, thescene.cuorg, thescene.cusize); |
256 |
< |
avsave(&amb); /* write to file */ |
307 |
> |
avsave(&amb); /* and save to file */ |
308 |
|
return(amb.rad); |
309 |
|
} |
310 |
|
|
311 |
|
|
312 |
< |
double |
313 |
< |
doambient(acol, r) /* compute ambient component */ |
314 |
< |
COLOR acol; |
315 |
< |
register RAY *r; |
312 |
> |
extambient(cr, ap, pv, nv) /* extrapolate value at pv, nv */ |
313 |
> |
COLOR cr; |
314 |
> |
register AMBVAL *ap; |
315 |
> |
FVECT pv, nv; |
316 |
|
{ |
317 |
< |
extern int ambcmp(); |
318 |
< |
extern double sin(), cos(), sqrt(); |
319 |
< |
double phi, xd, yd, zd; |
269 |
< |
register AMBSAMP *div; |
270 |
< |
AMBSAMP dnew; |
271 |
< |
RAY ar; |
272 |
< |
FVECT ux, uy; |
273 |
< |
double arad; |
274 |
< |
int ndivs, nt, np, ns, ne, i, j; |
275 |
< |
register int k; |
317 |
> |
FVECT v1, v2; |
318 |
> |
register int i; |
319 |
> |
double d; |
320 |
|
|
321 |
< |
setcolor(acol, 0.0, 0.0, 0.0); |
322 |
< |
/* set number of divisions */ |
323 |
< |
nt = sqrt(ambdiv * r->rweight * 0.5) + 0.5; |
324 |
< |
np = 2 * nt; |
325 |
< |
ndivs = nt * np; |
326 |
< |
/* check first */ |
327 |
< |
if (ndivs == 0 || rayorigin(&ar, r, AMBIENT, 0.5) < 0) |
328 |
< |
return(0.0); |
329 |
< |
/* set number of super-samples */ |
330 |
< |
ns = ambssamp * r->rweight + 0.5; |
331 |
< |
if (ns > 0) { |
288 |
< |
div = (AMBSAMP *)malloc(ndivs*sizeof(AMBSAMP)); |
289 |
< |
if (div == NULL) |
290 |
< |
error(SYSTEM, "out of memory in doambient"); |
321 |
> |
d = 1.0; /* zeroeth order */ |
322 |
> |
/* gradient due to translation */ |
323 |
> |
for (i = 0; i < 3; i++) |
324 |
> |
d += ap->gpos[i]*(pv[i]-ap->pos[i]); |
325 |
> |
/* gradient due to rotation */ |
326 |
> |
VCOPY(v1, ap->dir); |
327 |
> |
fcross(v2, v1, nv); |
328 |
> |
d += DOT(ap->gdir, v2); |
329 |
> |
if (d <= 0.0) { |
330 |
> |
setcolor(cr, 0.0, 0.0, 0.0); |
331 |
> |
return; |
332 |
|
} |
333 |
< |
/* make axes */ |
334 |
< |
uy[0] = uy[1] = uy[2] = 0.0; |
294 |
< |
for (k = 0; k < 3; k++) |
295 |
< |
if (r->ron[k] < 0.6 && r->ron[k] > -0.6) |
296 |
< |
break; |
297 |
< |
uy[k] = 1.0; |
298 |
< |
fcross(ux, r->ron, uy); |
299 |
< |
normalize(ux); |
300 |
< |
fcross(uy, ux, r->ron); |
301 |
< |
/* sample divisions */ |
302 |
< |
arad = 0.0; |
303 |
< |
ne = 0; |
304 |
< |
for (i = 0; i < nt; i++) |
305 |
< |
for (j = 0; j < np; j++) { |
306 |
< |
rayorigin(&ar, r, AMBIENT, 0.5); /* pretested */ |
307 |
< |
zd = sqrt((i+frandom())/nt); |
308 |
< |
phi = 2.0*PI * (j+frandom())/np; |
309 |
< |
xd = cos(phi) * zd; |
310 |
< |
yd = sin(phi) * zd; |
311 |
< |
zd = sqrt(1.0 - zd*zd); |
312 |
< |
for (k = 0; k < 3; k++) |
313 |
< |
ar.rdir[k] = xd*ux[k]+yd*uy[k]+zd*r->ron[k]; |
314 |
< |
rayvalue(&ar); |
315 |
< |
if (ar.rot < FHUGE) |
316 |
< |
arad += 1.0 / ar.rot; |
317 |
< |
if (ns > 0) { /* save division */ |
318 |
< |
div[ne].k = 0.0; |
319 |
< |
copycolor(div[ne].v, ar.rcol); |
320 |
< |
div[ne].n = 0; |
321 |
< |
div[ne].t = i; div[ne].p = j; |
322 |
< |
/* sum errors */ |
323 |
< |
xd = bright(ar.rcol); |
324 |
< |
if (i > 0) { /* from above */ |
325 |
< |
yd = bright(div[ne-np].v) - xd; |
326 |
< |
yd *= yd * 0.25; |
327 |
< |
div[ne].k += yd; |
328 |
< |
div[ne].n++; |
329 |
< |
div[ne-np].k += yd; |
330 |
< |
div[ne-np].n++; |
331 |
< |
} |
332 |
< |
if (j > 0) { /* from behind */ |
333 |
< |
yd = bright(div[ne-1].v) - xd; |
334 |
< |
yd *= yd * 0.25; |
335 |
< |
div[ne].k += yd; |
336 |
< |
div[ne].n++; |
337 |
< |
div[ne-1].k += yd; |
338 |
< |
div[ne-1].n++; |
339 |
< |
} |
340 |
< |
if (j == np-1) { /* around */ |
341 |
< |
yd = bright(div[ne-(np-1)].v) - xd; |
342 |
< |
yd *= yd * 0.25; |
343 |
< |
div[ne].k += yd; |
344 |
< |
div[ne].n++; |
345 |
< |
div[ne-(np-1)].k += yd; |
346 |
< |
div[ne-(np-1)].n++; |
347 |
< |
} |
348 |
< |
ne++; |
349 |
< |
} else |
350 |
< |
addcolor(acol, ar.rcol); |
351 |
< |
} |
352 |
< |
for (k = 0; k < ne; k++) { /* compute errors */ |
353 |
< |
if (div[k].n > 1) |
354 |
< |
div[k].k /= div[k].n; |
355 |
< |
div[k].n = 1; |
356 |
< |
} |
357 |
< |
/* sort the divisions */ |
358 |
< |
qsort(div, ne, sizeof(AMBSAMP), ambcmp); |
359 |
< |
/* skim excess */ |
360 |
< |
while (ne > ns) { |
361 |
< |
ne--; |
362 |
< |
addcolor(acol, div[ne].v); |
363 |
< |
} |
364 |
< |
/* super-sample */ |
365 |
< |
for (i = ns; i > 0; i--) { |
366 |
< |
rayorigin(&ar, r, AMBIENT, 0.5); /* pretested */ |
367 |
< |
zd = sqrt((div[0].t+frandom())/nt); |
368 |
< |
phi = 2.0*PI * (div[0].p+frandom())/np; |
369 |
< |
xd = cos(phi) * zd; |
370 |
< |
yd = sin(phi) * zd; |
371 |
< |
zd = sqrt(1.0 - zd*zd); |
372 |
< |
for (k = 0; k < 3; k++) |
373 |
< |
ar.rdir[k] = xd*ux[k]+yd*uy[k]+zd*r->ron[k]; |
374 |
< |
rayvalue(&ar); |
375 |
< |
if (ar.rot < FHUGE) |
376 |
< |
arad += 1.0 / ar.rot; |
377 |
< |
/* recompute error */ |
378 |
< |
copycolor(dnew.v, div[0].v); |
379 |
< |
addcolor(dnew.v, ar.rcol); |
380 |
< |
dnew.n = div[0].n + 1; |
381 |
< |
dnew.t = div[0].t; dnew.p = div[0].p; |
382 |
< |
yd = bright(dnew.v)/dnew.n - bright(ar.rcol); |
383 |
< |
yd = yd*yd + div[0].k*(div[0].n*div[0].n); |
384 |
< |
dnew.k = yd/(dnew.n*dnew.n); |
385 |
< |
/* reinsert */ |
386 |
< |
for (k = 0; k < ne-1 && dnew.k < div[k+1].k; k++) |
387 |
< |
bcopy(&div[k+1], &div[k], sizeof(AMBSAMP)); |
388 |
< |
bcopy(&dnew, &div[k], sizeof(AMBSAMP)); |
389 |
< |
|
390 |
< |
if (ne >= i) { /* extract darkest division */ |
391 |
< |
ne--; |
392 |
< |
if (div[ne].n > 1) |
393 |
< |
scalecolor(div[ne].v, 1.0/div[ne].n); |
394 |
< |
addcolor(acol, div[ne].v); |
395 |
< |
} |
396 |
< |
} |
397 |
< |
scalecolor(acol, 1.0/ndivs); |
398 |
< |
if (arad <= FTINY) |
399 |
< |
arad = FHUGE; |
400 |
< |
else |
401 |
< |
arad = (ndivs+ns) / arad / sqrt(r->rweight); |
402 |
< |
if (arad > maxarad) |
403 |
< |
arad = maxarad; |
404 |
< |
else if (arad < minarad) |
405 |
< |
arad = minarad; |
406 |
< |
if (ns > 0) |
407 |
< |
free((char *)div); |
408 |
< |
return(arad); |
333 |
> |
copycolor(cr, ap->val); |
334 |
> |
scalecolor(cr, d); |
335 |
|
} |
336 |
|
|
337 |
|
|
338 |
< |
static int |
339 |
< |
ambcmp(d1, d2) /* decreasing order */ |
340 |
< |
AMBSAMP *d1, *d2; |
338 |
> |
static |
339 |
> |
initambfile(creat) /* initialize ambient file */ |
340 |
> |
int creat; |
341 |
|
{ |
342 |
< |
if (d1->k < d2->k) |
343 |
< |
return(1); |
344 |
< |
if (d1->k > d2->k) |
345 |
< |
return(-1); |
346 |
< |
return(0); |
342 |
> |
extern char *progname, *octname, VersionID[]; |
343 |
> |
|
344 |
> |
#ifdef F_SETLKW |
345 |
> |
aflock(creat ? F_WRLCK : F_RDLCK); |
346 |
> |
#endif |
347 |
> |
#ifdef MSDOS |
348 |
> |
setmode(fileno(ambfp), O_BINARY); |
349 |
> |
#endif |
350 |
> |
setbuf(ambfp, bmalloc(BUFSIZ+8)); |
351 |
> |
if (creat) { /* new file */ |
352 |
> |
fprintf(ambfp, "%s -av %g %g %g -ab %d -aa %g ", |
353 |
> |
progname, colval(ambval,RED), |
354 |
> |
colval(ambval,GRN), colval(ambval,BLU), |
355 |
> |
ambounce, ambacc); |
356 |
> |
fprintf(ambfp, "-ad %d -as %d -ar %d %s\n", |
357 |
> |
ambdiv, ambssamp, ambres, |
358 |
> |
octname==NULL ? "" : octname); |
359 |
> |
fprintf(ambfp, "SOFTWARE= %s\n", VersionID); |
360 |
> |
fputformat(AMBFMT, ambfp); |
361 |
> |
putc('\n', ambfp); |
362 |
> |
putambmagic(ambfp); |
363 |
> |
} else if (checkheader(ambfp, AMBFMT, NULL) < 0 || !hasambmagic(ambfp)) |
364 |
> |
error(USER, "bad ambient file"); |
365 |
|
} |
366 |
|
|
367 |
|
|
368 |
|
static |
369 |
< |
avsave(av) /* save an ambient value */ |
370 |
< |
AMBVAL *av; |
369 |
> |
avsave(av) /* insert and save an ambient value */ |
370 |
> |
AMBVAL *av; |
371 |
|
{ |
372 |
< |
#ifdef AMBFLUSH |
429 |
< |
static int nunflshed = 0; |
430 |
< |
#endif |
372 |
> |
avinsert(avstore(av)); |
373 |
|
if (ambfp == NULL) |
374 |
|
return; |
375 |
< |
if (fwrite(av, sizeof(AMBVAL), 1, ambfp) != 1) |
375 |
> |
if (writambval(av, ambfp) < 0) |
376 |
|
goto writerr; |
377 |
< |
#ifdef AMBFLUSH |
378 |
< |
if (++nunflshed >= AMBFLUSH) { |
437 |
< |
if (fflush(ambfp) == EOF) |
377 |
> |
if (++nunflshed >= AMBFLUSH) |
378 |
> |
if (ambsync() == EOF) |
379 |
|
goto writerr; |
439 |
– |
nunflshed = 0; |
440 |
– |
} |
441 |
– |
#endif |
380 |
|
return; |
381 |
|
writerr: |
382 |
|
error(SYSTEM, "error writing ambient file"); |
383 |
|
} |
384 |
|
|
385 |
|
|
386 |
+ |
static AMBVAL * |
387 |
+ |
avstore(aval) /* allocate memory and store aval */ |
388 |
+ |
register AMBVAL *aval; |
389 |
+ |
{ |
390 |
+ |
register AMBVAL *av; |
391 |
+ |
|
392 |
+ |
if ((av = newambval()) == NULL) |
393 |
+ |
error(SYSTEM, "out of memory in avstore"); |
394 |
+ |
copystruct(av, aval); |
395 |
+ |
return(av); |
396 |
+ |
} |
397 |
+ |
|
398 |
+ |
|
399 |
|
static |
400 |
< |
avinsert(aval, at, c0, s) /* insert ambient value in a tree */ |
401 |
< |
AMBVAL *aval; |
451 |
< |
register AMBTREE *at; |
452 |
< |
FVECT c0; |
453 |
< |
double s; |
400 |
> |
avinsert(av) /* insert ambient value in our tree */ |
401 |
> |
register AMBVAL *av; |
402 |
|
{ |
403 |
+ |
register AMBTREE *at; |
404 |
|
FVECT ck0; |
405 |
+ |
double s; |
406 |
|
int branch; |
457 |
– |
register AMBVAL *av; |
407 |
|
register int i; |
408 |
|
|
409 |
< |
if ((av = newambval()) == NULL) |
410 |
< |
goto memerr; |
411 |
< |
bcopy(aval, av, sizeof(AMBVAL)); |
412 |
< |
VCOPY(ck0, c0); |
409 |
> |
if (av->rad <= FTINY) |
410 |
> |
error(CONSISTENCY, "zero ambient radius in avinsert"); |
411 |
> |
at = &atrunk; |
412 |
> |
VCOPY(ck0, thescene.cuorg); |
413 |
> |
s = thescene.cusize; |
414 |
|
while (s*(OCTSCALE/2) > av->rad*ambacc) { |
415 |
|
if (at->kid == NULL) |
416 |
|
if ((at->kid = newambtree()) == NULL) |
417 |
< |
goto memerr; |
417 |
> |
error(SYSTEM, "out of memory in avinsert"); |
418 |
|
s *= 0.5; |
419 |
|
branch = 0; |
420 |
|
for (i = 0; i < 3; i++) |
426 |
|
} |
427 |
|
av->next = at->alist; |
428 |
|
at->alist = av; |
479 |
– |
return; |
480 |
– |
memerr: |
481 |
– |
error(SYSTEM, "out of memory in avinsert"); |
429 |
|
} |
430 |
+ |
|
431 |
+ |
|
432 |
+ |
static |
433 |
+ |
loadatree(at) /* move tree to main store */ |
434 |
+ |
register AMBTREE *at; |
435 |
+ |
{ |
436 |
+ |
register AMBVAL *av; |
437 |
+ |
register int i; |
438 |
+ |
/* transfer values at this node */ |
439 |
+ |
for (av = at->alist; av != NULL; av = at->alist) { |
440 |
+ |
at->alist = av->next; |
441 |
+ |
avinsert(av); |
442 |
+ |
} |
443 |
+ |
if (at->kid == NULL) |
444 |
+ |
return; |
445 |
+ |
for (i = 0; i < 8; i++) /* transfer and free children */ |
446 |
+ |
loadatree(at->kid+i); |
447 |
+ |
freeambtree(at->kid); |
448 |
+ |
} |
449 |
+ |
|
450 |
+ |
|
451 |
+ |
#ifdef F_SETLKW |
452 |
+ |
|
453 |
+ |
static |
454 |
+ |
aflock(typ) /* lock/unlock ambient file */ |
455 |
+ |
int typ; |
456 |
+ |
{ |
457 |
+ |
static struct flock fls; /* static so initialized to zeroes */ |
458 |
+ |
|
459 |
+ |
fls.l_type = typ; |
460 |
+ |
if (fcntl(fileno(ambfp), F_SETLKW, &fls) < 0) |
461 |
+ |
error(SYSTEM, "cannot (un)lock ambient file"); |
462 |
+ |
} |
463 |
+ |
|
464 |
+ |
|
465 |
+ |
int |
466 |
+ |
ambsync() /* synchronize ambient file */ |
467 |
+ |
{ |
468 |
+ |
static FILE *ambinp = NULL; |
469 |
+ |
static long lastpos = -1; |
470 |
+ |
long flen; |
471 |
+ |
AMBVAL avs; |
472 |
+ |
register int n; |
473 |
+ |
|
474 |
+ |
if (nunflshed == 0) |
475 |
+ |
return(0); |
476 |
+ |
if (lastpos < 0) /* initializing (locked in initambfile) */ |
477 |
+ |
goto syncend; |
478 |
+ |
/* gain exclusive access */ |
479 |
+ |
aflock(F_WRLCK); |
480 |
+ |
/* see if file has grown */ |
481 |
+ |
if ((flen = lseek(fileno(ambfp), 0L, 2)) < 0) |
482 |
+ |
goto seekerr; |
483 |
+ |
if (n = flen - lastpos) { /* file has grown */ |
484 |
+ |
if (ambinp == NULL) { /* use duplicate filedes */ |
485 |
+ |
ambinp = fdopen(dup(fileno(ambfp)), "r"); |
486 |
+ |
if (ambinp == NULL) |
487 |
+ |
error(SYSTEM, "fdopen failed in ambsync"); |
488 |
+ |
} |
489 |
+ |
if (fseek(ambinp, lastpos, 0) < 0) |
490 |
+ |
goto seekerr; |
491 |
+ |
while (n >= AMBVALSIZ) { /* load contributed values */ |
492 |
+ |
readambval(&avs, ambinp); |
493 |
+ |
avinsert(avstore(&avs)); |
494 |
+ |
n -= AMBVALSIZ; |
495 |
+ |
} |
496 |
+ |
if (n) /* alignment */ |
497 |
+ |
if (lseek(fileno(ambfp), flen-n, 0) < 0) |
498 |
+ |
goto seekerr; |
499 |
+ |
} |
500 |
+ |
#ifdef DEBUG |
501 |
+ |
if (ambfp->_ptr - ambfp->_base != nunflshed*AMBVALSIZ) { |
502 |
+ |
sprintf(errmsg, "ambient file buffer at %d rather than %d", |
503 |
+ |
ambfp->_ptr - ambfp->_base, |
504 |
+ |
nunflshed*AMBVALSIZ); |
505 |
+ |
error(CONSISTENCY, errmsg); |
506 |
+ |
} |
507 |
+ |
#endif |
508 |
+ |
syncend: |
509 |
+ |
n = fflush(ambfp); /* calls write() at last */ |
510 |
+ |
if ((lastpos = lseek(fileno(ambfp), 0L, 1)) < 0) |
511 |
+ |
goto seekerr; |
512 |
+ |
aflock(F_UNLCK); /* release file */ |
513 |
+ |
nunflshed = 0; |
514 |
+ |
return(n); |
515 |
+ |
seekerr: |
516 |
+ |
error(SYSTEM, "seek failed in ambsync"); |
517 |
+ |
} |
518 |
+ |
|
519 |
+ |
#else |
520 |
+ |
|
521 |
+ |
int |
522 |
+ |
ambsync() /* flush ambient file */ |
523 |
+ |
{ |
524 |
+ |
if (nunflshed == 0) |
525 |
+ |
return(0); |
526 |
+ |
nunflshed = 0; |
527 |
+ |
return(fflush(ambfp)); |
528 |
+ |
} |
529 |
+ |
|
530 |
+ |
#endif |