1 |
greg |
2.38 |
/* Copyright (c) 1996 Regents of the University of California */ |
2 |
greg |
1.1 |
|
3 |
|
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#ifndef lint |
4 |
|
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static char SCCSid[] = "$SunId$ LBL"; |
5 |
|
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#endif |
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 |
|
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*/ |
10 |
|
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|
11 |
|
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#include "ray.h" |
12 |
|
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|
13 |
|
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#include "octree.h" |
14 |
|
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|
15 |
greg |
1.8 |
#include "otypes.h" |
16 |
|
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|
17 |
greg |
1.14 |
#include "ambient.h" |
18 |
|
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|
19 |
greg |
1.1 |
#include "random.h" |
20 |
|
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|
21 |
greg |
2.32 |
#ifndef OCTSCALE |
22 |
greg |
2.29 |
#define OCTSCALE 1.0 /* ceil((valid rad.)/(cube size)) */ |
23 |
greg |
2.32 |
#endif |
24 |
greg |
1.1 |
|
25 |
greg |
1.14 |
typedef struct ambtree { |
26 |
greg |
2.12 |
AMBVAL *alist; /* ambient value list */ |
27 |
|
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struct ambtree *kid; /* 8 child nodes */ |
28 |
greg |
1.14 |
} AMBTREE; /* ambient octree */ |
29 |
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30 |
greg |
1.1 |
extern CUBE thescene; /* contains space boundaries */ |
31 |
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32 |
greg |
2.27 |
extern char *shm_boundary; /* memory sharing boundary */ |
33 |
greg |
2.26 |
|
34 |
greg |
2.12 |
#define MAXASET 511 /* maximum number of elements in ambient set */ |
35 |
|
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OBJECT ambset[MAXASET+1]={0}; /* ambient include/exclude set */ |
36 |
greg |
1.1 |
|
37 |
greg |
2.12 |
double maxarad; /* maximum ambient radius */ |
38 |
|
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double minarad; /* minimum ambient radius */ |
39 |
greg |
1.1 |
|
40 |
greg |
2.12 |
static AMBTREE atrunk; /* our ambient trunk node */ |
41 |
greg |
1.1 |
|
42 |
|
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static FILE *ambfp = NULL; /* ambient file pointer */ |
43 |
greg |
2.16 |
static int nunflshed = 0; /* number of unflushed ambient values */ |
44 |
greg |
1.1 |
|
45 |
greg |
2.26 |
#ifndef SORT_THRESH |
46 |
|
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#ifdef BIGMEM |
47 |
greg |
2.27 |
#define SORT_THRESH ((9L<<20)/sizeof(AMBVAL)) |
48 |
greg |
2.26 |
#else |
49 |
greg |
2.27 |
#define SORT_THRESH ((3L<<20)/sizeof(AMBVAL)) |
50 |
greg |
2.26 |
#endif |
51 |
|
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#endif |
52 |
|
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#ifndef SORT_INTVL |
53 |
greg |
2.29 |
#define SORT_INTVL (SORT_THRESH*256) |
54 |
greg |
2.26 |
#endif |
55 |
greg |
2.28 |
#ifndef MAX_SORT_INTVL |
56 |
greg |
2.29 |
#define MAX_SORT_INTVL (SORT_INTVL<<4) |
57 |
greg |
2.28 |
#endif |
58 |
greg |
2.26 |
|
59 |
greg |
2.32 |
static COLOR avsum = BLKCOLOR; /* computed ambient value sum */ |
60 |
greg |
2.35 |
static unsigned int nambvals = 0; /* total number of indirect values */ |
61 |
|
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static unsigned int nambshare = 0; /* number of values from file */ |
62 |
greg |
2.27 |
static unsigned long ambclock = 0; /* ambient access clock */ |
63 |
|
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static unsigned long lastsort = 0; /* time of last value sort */ |
64 |
greg |
2.26 |
static long sortintvl = SORT_INTVL; /* time until next sort */ |
65 |
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|
66 |
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#define MAXACLOCK (1L<<30) /* clock turnover value */ |
67 |
greg |
2.27 |
/* |
68 |
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* Track access times unless we are sharing ambient values |
69 |
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* through memory on a multiprocessor, when we want to avoid |
70 |
greg |
2.35 |
* claiming our own memory (copy on write). Go ahead anyway |
71 |
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* if more than two thirds of our values are unshared. |
72 |
greg |
2.27 |
*/ |
73 |
greg |
2.35 |
#define tracktime (shm_boundary == NULL || nambvals > 3*nambshare) |
74 |
greg |
2.26 |
|
75 |
greg |
2.12 |
#define AMBFLUSH (BUFSIZ/AMBVALSIZ) |
76 |
greg |
2.6 |
|
77 |
greg |
2.12 |
#define newambval() (AMBVAL *)bmalloc(sizeof(AMBVAL)) |
78 |
greg |
1.1 |
|
79 |
greg |
2.7 |
extern long ftell(), lseek(); |
80 |
greg |
2.26 |
static int initambfile(), avsave(), avinsert(), sortambvals(); |
81 |
greg |
2.20 |
static AMBVAL *avstore(); |
82 |
greg |
2.19 |
#ifdef F_SETLKW |
83 |
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static aflock(); |
84 |
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#endif |
85 |
greg |
1.1 |
|
86 |
greg |
2.7 |
|
87 |
greg |
2.3 |
setambres(ar) /* set ambient resolution */ |
88 |
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int ar; |
89 |
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{ |
90 |
greg |
2.21 |
ambres = ar < 0 ? 0 : ar; /* may be done already */ |
91 |
greg |
2.3 |
/* set min & max radii */ |
92 |
|
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if (ar <= 0) { |
93 |
greg |
2.25 |
minarad = 0; |
94 |
greg |
2.3 |
maxarad = thescene.cusize / 2.0; |
95 |
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} else { |
96 |
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minarad = thescene.cusize / ar; |
97 |
greg |
2.30 |
maxarad = 64 * minarad; /* heuristic */ |
98 |
greg |
2.3 |
if (maxarad > thescene.cusize / 2.0) |
99 |
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maxarad = thescene.cusize / 2.0; |
100 |
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} |
101 |
greg |
2.25 |
if (minarad <= FTINY) |
102 |
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minarad = 10*FTINY; |
103 |
|
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if (maxarad <= minarad) |
104 |
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maxarad = 64 * minarad; |
105 |
greg |
2.3 |
} |
106 |
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107 |
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|
108 |
greg |
2.21 |
setambacc(newa) /* set ambient accuracy */ |
109 |
greg |
2.20 |
double newa; |
110 |
|
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{ |
111 |
greg |
2.33 |
double ambdiff; |
112 |
greg |
2.20 |
|
113 |
greg |
2.33 |
if (newa < 0.0) |
114 |
|
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newa = 0.0; |
115 |
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ambdiff = fabs(newa - ambacc); |
116 |
|
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if (ambdiff >= .01 && (ambacc = newa) > FTINY && nambvals > 0) |
117 |
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sortambvals(1); /* rebuild tree */ |
118 |
greg |
2.20 |
} |
119 |
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|
120 |
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|
121 |
greg |
1.1 |
setambient(afile) /* initialize calculation */ |
122 |
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char *afile; |
123 |
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{ |
124 |
greg |
2.37 |
long pos, flen; |
125 |
greg |
2.12 |
AMBVAL amb; |
126 |
greg |
2.3 |
/* init ambient limits */ |
127 |
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setambres(ambres); |
128 |
greg |
2.21 |
setambacc(ambacc); |
129 |
greg |
2.19 |
if (afile == NULL) |
130 |
|
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return; |
131 |
greg |
2.20 |
if (ambacc <= FTINY) { |
132 |
greg |
2.21 |
sprintf(errmsg, "zero ambient accuracy so \"%s\" not opened", |
133 |
greg |
2.20 |
afile); |
134 |
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error(WARNING, errmsg); |
135 |
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return; |
136 |
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} |
137 |
greg |
2.3 |
/* open ambient file */ |
138 |
greg |
2.19 |
if ((ambfp = fopen(afile, "r+")) != NULL) { |
139 |
|
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initambfile(0); |
140 |
greg |
2.37 |
pos = ftell(ambfp); |
141 |
greg |
2.19 |
while (readambval(&amb, ambfp)) |
142 |
greg |
2.21 |
avinsert(avstore(&amb)); |
143 |
greg |
2.19 |
/* align */ |
144 |
greg |
2.37 |
pos += (long)nambvals*AMBVALSIZ; |
145 |
|
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flen = lseek(fileno(ambfp), 0L, 2); |
146 |
|
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if (flen != pos) { |
147 |
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error(WARNING, |
148 |
|
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"ignoring last %ld values in ambient file (corrupted)", |
149 |
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(flen - pos)/AMBVALSIZ); |
150 |
|
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fseek(ambfp, pos, 0); |
151 |
|
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ftruncate(fileno(ambfp), pos); |
152 |
|
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} |
153 |
greg |
2.35 |
nambshare = nambvals; |
154 |
greg |
2.19 |
} else if ((ambfp = fopen(afile, "w+")) != NULL) |
155 |
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initambfile(1); |
156 |
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else { |
157 |
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sprintf(errmsg, "cannot open ambient file \"%s\"", afile); |
158 |
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error(SYSTEM, errmsg); |
159 |
greg |
2.16 |
} |
160 |
greg |
2.19 |
nunflshed++; /* lie */ |
161 |
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ambsync(); |
162 |
greg |
1.8 |
} |
163 |
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164 |
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|
165 |
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ambnotify(obj) /* record new modifier */ |
166 |
greg |
2.12 |
OBJECT obj; |
167 |
greg |
1.8 |
{ |
168 |
greg |
1.11 |
static int hitlimit = 0; |
169 |
greg |
2.12 |
register OBJREC *o = objptr(obj); |
170 |
greg |
1.8 |
register char **amblp; |
171 |
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|
172 |
greg |
1.11 |
if (hitlimit || !ismodifier(o->otype)) |
173 |
greg |
1.8 |
return; |
174 |
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for (amblp = amblist; *amblp != NULL; amblp++) |
175 |
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if (!strcmp(o->oname, *amblp)) { |
176 |
greg |
1.11 |
if (ambset[0] >= MAXASET) { |
177 |
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error(WARNING, "too many modifiers in ambient list"); |
178 |
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hitlimit++; |
179 |
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return; /* should this be fatal? */ |
180 |
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} |
181 |
greg |
1.8 |
insertelem(ambset, obj); |
182 |
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return; |
183 |
greg |
1.1 |
} |
184 |
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} |
185 |
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186 |
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|
187 |
greg |
2.34 |
ambient(acol, r, nrm) /* compute ambient component for ray */ |
188 |
greg |
1.1 |
COLOR acol; |
189 |
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register RAY *r; |
190 |
greg |
2.34 |
FVECT nrm; |
191 |
greg |
1.1 |
{ |
192 |
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static int rdepth = 0; /* ambient recursion */ |
193 |
greg |
2.12 |
double d; |
194 |
greg |
1.1 |
|
195 |
|
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if (ambdiv <= 0) /* no ambient calculation */ |
196 |
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goto dumbamb; |
197 |
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/* check number of bounces */ |
198 |
greg |
1.16 |
if (rdepth >= ambounce) |
199 |
greg |
1.1 |
goto dumbamb; |
200 |
|
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/* check ambient list */ |
201 |
|
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if (ambincl != -1 && r->ro != NULL && |
202 |
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ambincl != inset(ambset, r->ro->omod)) |
203 |
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goto dumbamb; |
204 |
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|
205 |
|
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if (ambacc <= FTINY) { /* no ambient storage */ |
206 |
greg |
1.16 |
rdepth++; |
207 |
|
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d = doambient(acol, r, r->rweight, NULL, NULL); |
208 |
|
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rdepth--; |
209 |
greg |
2.32 |
if (d <= FTINY) |
210 |
greg |
1.1 |
goto dumbamb; |
211 |
greg |
1.16 |
return; |
212 |
greg |
1.1 |
} |
213 |
greg |
2.27 |
/* resort memory? */ |
214 |
greg |
2.28 |
sortambvals(0); |
215 |
greg |
1.1 |
/* get ambient value */ |
216 |
|
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setcolor(acol, 0.0, 0.0, 0.0); |
217 |
greg |
2.34 |
d = sumambient(acol, r, nrm, rdepth, |
218 |
greg |
1.16 |
&atrunk, thescene.cuorg, thescene.cusize); |
219 |
greg |
2.32 |
if (d > FTINY) { |
220 |
greg |
1.16 |
scalecolor(acol, 1.0/d); |
221 |
greg |
2.32 |
return; |
222 |
greg |
1.16 |
} |
223 |
greg |
2.33 |
rdepth++; /* need to cache new value */ |
224 |
greg |
2.34 |
d = makeambient(acol, r, nrm, rdepth-1); |
225 |
greg |
2.32 |
rdepth--; |
226 |
greg |
1.16 |
if (d > FTINY) |
227 |
|
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return; |
228 |
greg |
1.1 |
dumbamb: /* return global value */ |
229 |
|
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copycolor(acol, ambval); |
230 |
greg |
2.36 |
if (ambvwt <= 0 | nambvals == 0) |
231 |
greg |
2.32 |
return; |
232 |
greg |
2.36 |
scalecolor(acol, (double)ambvwt); |
233 |
greg |
2.32 |
addcolor(acol, avsum); /* average in computations */ |
234 |
greg |
2.36 |
d = 1.0/(ambvwt+nambvals); |
235 |
greg |
2.32 |
scalecolor(acol, d); |
236 |
greg |
1.1 |
} |
237 |
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|
238 |
|
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|
239 |
|
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double |
240 |
greg |
2.34 |
sumambient(acol, r, rn, al, at, c0, s) /* get interpolated ambient value */ |
241 |
greg |
1.1 |
COLOR acol; |
242 |
|
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register RAY *r; |
243 |
greg |
2.34 |
FVECT rn; |
244 |
greg |
1.16 |
int al; |
245 |
greg |
2.12 |
AMBTREE *at; |
246 |
greg |
1.1 |
FVECT c0; |
247 |
greg |
2.12 |
double s; |
248 |
greg |
1.1 |
{ |
249 |
greg |
2.12 |
double d, e1, e2, wt, wsum; |
250 |
greg |
1.1 |
COLOR ct; |
251 |
|
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FVECT ck0; |
252 |
|
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int i; |
253 |
|
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register int j; |
254 |
greg |
2.12 |
register AMBVAL *av; |
255 |
greg |
2.29 |
|
256 |
|
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wsum = 0.0; |
257 |
greg |
1.7 |
/* do this node */ |
258 |
greg |
1.1 |
for (av = at->alist; av != NULL; av = av->next) { |
259 |
greg |
2.26 |
if (tracktime) |
260 |
|
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av->latick = ambclock++; |
261 |
greg |
1.1 |
/* |
262 |
greg |
1.16 |
* Ambient level test. |
263 |
greg |
1.1 |
*/ |
264 |
greg |
2.23 |
if (av->lvl > al) /* list sorted, so this works */ |
265 |
|
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break; |
266 |
|
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if (av->weight < r->rweight-FTINY) |
267 |
greg |
1.1 |
continue; |
268 |
|
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/* |
269 |
|
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* Ambient radius test. |
270 |
|
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*/ |
271 |
greg |
2.29 |
d = av->pos[0] - r->rop[0]; |
272 |
|
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e1 = d * d; |
273 |
|
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d = av->pos[1] - r->rop[1]; |
274 |
|
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e1 += d * d; |
275 |
|
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d = av->pos[2] - r->rop[2]; |
276 |
|
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e1 += d * d; |
277 |
greg |
1.1 |
e1 /= av->rad * av->rad; |
278 |
|
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if (e1 > ambacc*ambacc*1.21) |
279 |
|
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continue; |
280 |
|
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/* |
281 |
|
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* Normal direction test. |
282 |
|
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*/ |
283 |
|
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e2 = (1.0 - DOT(av->dir, r->ron)) * r->rweight; |
284 |
|
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if (e2 < 0.0) e2 = 0.0; |
285 |
|
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if (e1 + e2 > ambacc*ambacc*1.21) |
286 |
|
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continue; |
287 |
|
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/* |
288 |
|
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* Ray behind test. |
289 |
|
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*/ |
290 |
|
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d = 0.0; |
291 |
|
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for (j = 0; j < 3; j++) |
292 |
|
|
d += (r->rop[j] - av->pos[j]) * |
293 |
|
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(av->dir[j] + r->ron[j]); |
294 |
greg |
1.18 |
if (d*0.5 < -minarad*ambacc-.001) |
295 |
greg |
1.1 |
continue; |
296 |
|
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/* |
297 |
|
|
* Jittering final test reduces image artifacts. |
298 |
|
|
*/ |
299 |
|
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wt = sqrt(e1) + sqrt(e2); |
300 |
greg |
2.31 |
if (wt > ambacc*(.9+.2*urand(9015+samplendx))) |
301 |
greg |
1.1 |
continue; |
302 |
|
|
if (wt <= 1e-3) |
303 |
|
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wt = 1e3; |
304 |
|
|
else |
305 |
|
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wt = 1.0 / wt; |
306 |
|
|
wsum += wt; |
307 |
greg |
2.34 |
extambient(ct, av, r->rop, rn); |
308 |
greg |
1.1 |
scalecolor(ct, wt); |
309 |
|
|
addcolor(acol, ct); |
310 |
greg |
1.7 |
} |
311 |
|
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if (at->kid == NULL) |
312 |
|
|
return(wsum); |
313 |
|
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/* do children */ |
314 |
|
|
s *= 0.5; |
315 |
|
|
for (i = 0; i < 8; i++) { |
316 |
|
|
for (j = 0; j < 3; j++) { |
317 |
|
|
ck0[j] = c0[j]; |
318 |
|
|
if (1<<j & i) |
319 |
|
|
ck0[j] += s; |
320 |
|
|
if (r->rop[j] < ck0[j] - OCTSCALE*s) |
321 |
|
|
break; |
322 |
|
|
if (r->rop[j] > ck0[j] + (1.0+OCTSCALE)*s) |
323 |
|
|
break; |
324 |
|
|
} |
325 |
|
|
if (j == 3) |
326 |
greg |
2.34 |
wsum += sumambient(acol, r, rn, al, at->kid+i, ck0, s); |
327 |
greg |
1.1 |
} |
328 |
|
|
return(wsum); |
329 |
|
|
} |
330 |
|
|
|
331 |
|
|
|
332 |
|
|
double |
333 |
greg |
2.34 |
makeambient(acol, r, rn, al) /* make a new ambient value */ |
334 |
greg |
1.1 |
COLOR acol; |
335 |
|
|
register RAY *r; |
336 |
greg |
2.34 |
FVECT rn; |
337 |
greg |
1.16 |
int al; |
338 |
greg |
1.1 |
{ |
339 |
greg |
2.12 |
AMBVAL amb; |
340 |
greg |
1.14 |
FVECT gp, gd; |
341 |
greg |
1.16 |
/* compute weight */ |
342 |
|
|
amb.weight = pow(AVGREFL, (double)al); |
343 |
greg |
2.33 |
if (r->rweight < 0.1*amb.weight) /* heuristic */ |
344 |
greg |
1.16 |
amb.weight = r->rweight; |
345 |
|
|
/* compute ambient */ |
346 |
|
|
amb.rad = doambient(acol, r, amb.weight, gp, gd); |
347 |
greg |
2.33 |
if (amb.rad <= FTINY) |
348 |
greg |
1.1 |
return(0.0); |
349 |
|
|
/* store it */ |
350 |
|
|
VCOPY(amb.pos, r->rop); |
351 |
|
|
VCOPY(amb.dir, r->ron); |
352 |
greg |
1.16 |
amb.lvl = al; |
353 |
greg |
1.1 |
copycolor(amb.val, acol); |
354 |
greg |
1.14 |
VCOPY(amb.gpos, gp); |
355 |
|
|
VCOPY(amb.gdir, gd); |
356 |
greg |
1.1 |
/* insert into tree */ |
357 |
greg |
2.7 |
avsave(&amb); /* and save to file */ |
358 |
greg |
2.34 |
if (rn != r->ron) |
359 |
|
|
extambient(acol, &amb, r->rop, rn); /* texture */ |
360 |
greg |
1.1 |
return(amb.rad); |
361 |
greg |
1.15 |
} |
362 |
|
|
|
363 |
|
|
|
364 |
|
|
extambient(cr, ap, pv, nv) /* extrapolate value at pv, nv */ |
365 |
|
|
COLOR cr; |
366 |
greg |
2.12 |
register AMBVAL *ap; |
367 |
greg |
1.15 |
FVECT pv, nv; |
368 |
|
|
{ |
369 |
|
|
FVECT v1, v2; |
370 |
|
|
register int i; |
371 |
greg |
2.12 |
double d; |
372 |
greg |
1.15 |
|
373 |
|
|
d = 1.0; /* zeroeth order */ |
374 |
|
|
/* gradient due to translation */ |
375 |
|
|
for (i = 0; i < 3; i++) |
376 |
|
|
d += ap->gpos[i]*(pv[i]-ap->pos[i]); |
377 |
|
|
/* gradient due to rotation */ |
378 |
|
|
VCOPY(v1, ap->dir); |
379 |
|
|
fcross(v2, v1, nv); |
380 |
|
|
d += DOT(ap->gdir, v2); |
381 |
|
|
if (d <= 0.0) { |
382 |
|
|
setcolor(cr, 0.0, 0.0, 0.0); |
383 |
|
|
return; |
384 |
|
|
} |
385 |
|
|
copycolor(cr, ap->val); |
386 |
|
|
scalecolor(cr, d); |
387 |
greg |
1.1 |
} |
388 |
|
|
|
389 |
|
|
|
390 |
|
|
static |
391 |
greg |
2.9 |
initambfile(creat) /* initialize ambient file */ |
392 |
|
|
int creat; |
393 |
|
|
{ |
394 |
|
|
extern char *progname, *octname, VersionID[]; |
395 |
|
|
|
396 |
greg |
2.19 |
#ifdef F_SETLKW |
397 |
|
|
aflock(creat ? F_WRLCK : F_RDLCK); |
398 |
|
|
#endif |
399 |
greg |
2.12 |
#ifdef MSDOS |
400 |
|
|
setmode(fileno(ambfp), O_BINARY); |
401 |
|
|
#endif |
402 |
greg |
2.21 |
setbuf(ambfp, bmalloc(BUFSIZ+8)); |
403 |
greg |
2.9 |
if (creat) { /* new file */ |
404 |
greg |
2.24 |
newheader("RADIANCE", ambfp); |
405 |
greg |
2.9 |
fprintf(ambfp, "%s -av %g %g %g -ab %d -aa %g ", |
406 |
|
|
progname, colval(ambval,RED), |
407 |
|
|
colval(ambval,GRN), colval(ambval,BLU), |
408 |
|
|
ambounce, ambacc); |
409 |
|
|
fprintf(ambfp, "-ad %d -as %d -ar %d %s\n", |
410 |
|
|
ambdiv, ambssamp, ambres, |
411 |
|
|
octname==NULL ? "" : octname); |
412 |
|
|
fprintf(ambfp, "SOFTWARE= %s\n", VersionID); |
413 |
|
|
fputformat(AMBFMT, ambfp); |
414 |
|
|
putc('\n', ambfp); |
415 |
|
|
putambmagic(ambfp); |
416 |
greg |
2.17 |
} else if (checkheader(ambfp, AMBFMT, NULL) < 0 || !hasambmagic(ambfp)) |
417 |
|
|
error(USER, "bad ambient file"); |
418 |
greg |
2.9 |
} |
419 |
|
|
|
420 |
|
|
|
421 |
|
|
static |
422 |
greg |
2.7 |
avsave(av) /* insert and save an ambient value */ |
423 |
greg |
2.12 |
AMBVAL *av; |
424 |
greg |
1.1 |
{ |
425 |
greg |
2.21 |
avinsert(avstore(av)); |
426 |
greg |
1.1 |
if (ambfp == NULL) |
427 |
|
|
return; |
428 |
greg |
2.5 |
if (writambval(av, ambfp) < 0) |
429 |
greg |
1.1 |
goto writerr; |
430 |
greg |
2.16 |
if (++nunflshed >= AMBFLUSH) |
431 |
greg |
2.7 |
if (ambsync() == EOF) |
432 |
greg |
1.1 |
goto writerr; |
433 |
|
|
return; |
434 |
|
|
writerr: |
435 |
greg |
2.17 |
error(SYSTEM, "error writing ambient file"); |
436 |
greg |
1.1 |
} |
437 |
|
|
|
438 |
|
|
|
439 |
greg |
2.20 |
static AMBVAL * |
440 |
|
|
avstore(aval) /* allocate memory and store aval */ |
441 |
|
|
register AMBVAL *aval; |
442 |
|
|
{ |
443 |
|
|
register AMBVAL *av; |
444 |
|
|
|
445 |
|
|
if ((av = newambval()) == NULL) |
446 |
|
|
error(SYSTEM, "out of memory in avstore"); |
447 |
|
|
copystruct(av, aval); |
448 |
greg |
2.26 |
av->latick = ambclock; |
449 |
|
|
av->next = NULL; |
450 |
greg |
2.32 |
addcolor(avsum, av->val); /* add to sum for averaging */ |
451 |
greg |
2.26 |
nambvals++; |
452 |
greg |
2.20 |
return(av); |
453 |
|
|
} |
454 |
|
|
|
455 |
|
|
|
456 |
greg |
2.26 |
#define ATALLOCSZ 512 /* #/8 trees to allocate at once */ |
457 |
|
|
|
458 |
|
|
static AMBTREE *atfreelist = NULL; /* free ambient tree structures */ |
459 |
|
|
|
460 |
|
|
|
461 |
greg |
1.1 |
static |
462 |
greg |
2.26 |
AMBTREE * |
463 |
|
|
newambtree() /* allocate 8 ambient tree structs */ |
464 |
|
|
{ |
465 |
|
|
register AMBTREE *atp, *upperlim; |
466 |
|
|
|
467 |
|
|
if (atfreelist == NULL) { /* get more nodes */ |
468 |
|
|
atfreelist = (AMBTREE *)bmalloc(ATALLOCSZ*8*sizeof(AMBTREE)); |
469 |
|
|
if (atfreelist == NULL) |
470 |
|
|
return(NULL); |
471 |
|
|
/* link new free list */ |
472 |
|
|
upperlim = atfreelist + 8*(ATALLOCSZ-1); |
473 |
|
|
for (atp = atfreelist; atp < upperlim; atp += 8) |
474 |
|
|
atp->kid = atp + 8; |
475 |
|
|
atp->kid = NULL; |
476 |
|
|
} |
477 |
|
|
atp = atfreelist; |
478 |
|
|
atfreelist = atp->kid; |
479 |
|
|
bzero((char *)atp, 8*sizeof(AMBTREE)); |
480 |
|
|
return(atp); |
481 |
|
|
} |
482 |
|
|
|
483 |
|
|
|
484 |
|
|
static |
485 |
|
|
freeambtree(atp) /* free 8 ambient tree structs */ |
486 |
|
|
AMBTREE *atp; |
487 |
|
|
{ |
488 |
|
|
atp->kid = atfreelist; |
489 |
|
|
atfreelist = atp; |
490 |
|
|
} |
491 |
|
|
|
492 |
|
|
|
493 |
|
|
static |
494 |
greg |
2.21 |
avinsert(av) /* insert ambient value in our tree */ |
495 |
greg |
2.20 |
register AMBVAL *av; |
496 |
greg |
1.1 |
{ |
497 |
greg |
2.21 |
register AMBTREE *at; |
498 |
greg |
2.23 |
register AMBVAL *ap; |
499 |
|
|
AMBVAL avh; |
500 |
greg |
1.1 |
FVECT ck0; |
501 |
greg |
2.21 |
double s; |
502 |
greg |
1.1 |
int branch; |
503 |
|
|
register int i; |
504 |
|
|
|
505 |
greg |
2.20 |
if (av->rad <= FTINY) |
506 |
|
|
error(CONSISTENCY, "zero ambient radius in avinsert"); |
507 |
greg |
2.21 |
at = &atrunk; |
508 |
|
|
VCOPY(ck0, thescene.cuorg); |
509 |
|
|
s = thescene.cusize; |
510 |
greg |
1.1 |
while (s*(OCTSCALE/2) > av->rad*ambacc) { |
511 |
|
|
if (at->kid == NULL) |
512 |
|
|
if ((at->kid = newambtree()) == NULL) |
513 |
greg |
2.20 |
error(SYSTEM, "out of memory in avinsert"); |
514 |
greg |
1.1 |
s *= 0.5; |
515 |
|
|
branch = 0; |
516 |
|
|
for (i = 0; i < 3; i++) |
517 |
|
|
if (av->pos[i] > ck0[i] + s) { |
518 |
|
|
ck0[i] += s; |
519 |
|
|
branch |= 1 << i; |
520 |
|
|
} |
521 |
|
|
at = at->kid + branch; |
522 |
|
|
} |
523 |
greg |
2.23 |
avh.next = at->alist; /* order by increasing level */ |
524 |
|
|
for (ap = &avh; ap->next != NULL; ap = ap->next) |
525 |
|
|
if (ap->next->lvl >= av->lvl) |
526 |
|
|
break; |
527 |
|
|
av->next = ap->next; |
528 |
|
|
ap->next = av; |
529 |
|
|
at->alist = avh.next; |
530 |
greg |
2.7 |
} |
531 |
|
|
|
532 |
|
|
|
533 |
greg |
2.20 |
static |
534 |
greg |
2.26 |
unloadatree(at, f) /* unload an ambient value tree */ |
535 |
greg |
2.20 |
register AMBTREE *at; |
536 |
greg |
2.26 |
int (*f)(); |
537 |
greg |
2.20 |
{ |
538 |
|
|
register AMBVAL *av; |
539 |
|
|
register int i; |
540 |
|
|
/* transfer values at this node */ |
541 |
|
|
for (av = at->alist; av != NULL; av = at->alist) { |
542 |
|
|
at->alist = av->next; |
543 |
greg |
2.26 |
(*f)(av); |
544 |
greg |
2.20 |
} |
545 |
greg |
2.21 |
if (at->kid == NULL) |
546 |
|
|
return; |
547 |
greg |
2.20 |
for (i = 0; i < 8; i++) /* transfer and free children */ |
548 |
greg |
2.26 |
unloadatree(at->kid+i, f); |
549 |
greg |
2.20 |
freeambtree(at->kid); |
550 |
greg |
2.26 |
at->kid = NULL; |
551 |
|
|
} |
552 |
|
|
|
553 |
|
|
|
554 |
|
|
static AMBVAL **avlist1, **avlist2; /* ambient value lists for sorting */ |
555 |
|
|
static int i_avlist; /* index for lists */ |
556 |
|
|
|
557 |
|
|
|
558 |
|
|
static |
559 |
|
|
av2list(av) |
560 |
|
|
AMBVAL *av; |
561 |
|
|
{ |
562 |
greg |
2.27 |
#ifdef DEBUG |
563 |
greg |
2.26 |
if (i_avlist >= nambvals) |
564 |
|
|
error(CONSISTENCY, "too many ambient values in av2list1"); |
565 |
greg |
2.27 |
#endif |
566 |
greg |
2.26 |
avlist1[i_avlist] = avlist2[i_avlist] = av; |
567 |
|
|
i_avlist++; |
568 |
|
|
} |
569 |
|
|
|
570 |
|
|
|
571 |
|
|
static int |
572 |
|
|
alatcmp(avp1, avp2) /* compare ambient values for MRA */ |
573 |
|
|
AMBVAL **avp1, **avp2; |
574 |
|
|
{ |
575 |
greg |
2.38 |
register long lc = (**avp2).latick - (**avp1).latick; |
576 |
|
|
return(lc<0 ? -1 : lc>0 ? 1 : 0); |
577 |
greg |
2.26 |
} |
578 |
|
|
|
579 |
|
|
|
580 |
|
|
static int |
581 |
|
|
aposcmp(avp1, avp2) /* compare ambient value positions */ |
582 |
|
|
AMBVAL **avp1, **avp2; |
583 |
|
|
{ |
584 |
|
|
return(*avp1 - *avp2); |
585 |
|
|
} |
586 |
|
|
|
587 |
|
|
|
588 |
greg |
2.38 |
#if 1 |
589 |
greg |
2.27 |
static int |
590 |
|
|
avlmemi(avaddr) /* find list position from address */ |
591 |
|
|
AMBVAL *avaddr; |
592 |
|
|
{ |
593 |
|
|
register AMBVAL **avlpp; |
594 |
|
|
|
595 |
|
|
avlpp = (AMBVAL **)bsearch((char *)&avaddr, (char *)avlist2, |
596 |
|
|
nambvals, sizeof(AMBVAL *), aposcmp); |
597 |
|
|
if (avlpp == NULL) |
598 |
|
|
error(CONSISTENCY, "address not found in avlmemi"); |
599 |
|
|
return(avlpp - avlist2); |
600 |
|
|
} |
601 |
|
|
#else |
602 |
|
|
#define avlmemi(avaddr) ((AMBVAL **)bsearch((char *)&avaddr,(char *)avlist2, \ |
603 |
|
|
nambvals,sizeof(AMBVAL *),aposcmp) - avlist2) |
604 |
|
|
#endif |
605 |
|
|
|
606 |
|
|
|
607 |
greg |
2.26 |
static |
608 |
|
|
sortambvals(always) /* resort ambient values */ |
609 |
|
|
int always; |
610 |
|
|
{ |
611 |
|
|
AMBTREE oldatrunk; |
612 |
|
|
AMBVAL tav, *tap, *pnext; |
613 |
|
|
register int i, j; |
614 |
greg |
2.28 |
/* see if it's time yet */ |
615 |
|
|
if (!always && (ambclock < lastsort+sortintvl || |
616 |
|
|
nambvals < SORT_THRESH)) |
617 |
|
|
return; |
618 |
greg |
2.26 |
/* |
619 |
|
|
* The idea here is to minimize memory thrashing |
620 |
|
|
* in VM systems by improving reference locality. |
621 |
|
|
* We do this by periodically sorting our stored ambient |
622 |
|
|
* values in memory in order of most recently to least |
623 |
|
|
* recently accessed. This ordering was chosen so that new |
624 |
|
|
* ambient values (which tend to be less important) go into |
625 |
|
|
* higher memory with the infrequently accessed values. |
626 |
|
|
* Since we expect our values to need sorting less |
627 |
|
|
* frequently as the process continues, we double our |
628 |
|
|
* waiting interval after each call. |
629 |
|
|
* This routine is also called by setambacc() with |
630 |
|
|
* the "always" parameter set to 1 so that the ambient |
631 |
|
|
* tree will be rebuilt with the new accuracy parameter. |
632 |
|
|
*/ |
633 |
greg |
2.27 |
if (tracktime) { /* allocate pointer arrays to sort */ |
634 |
greg |
2.26 |
avlist1 = (AMBVAL **)malloc(nambvals*sizeof(AMBVAL *)); |
635 |
|
|
avlist2 = (AMBVAL **)malloc(nambvals*sizeof(AMBVAL *)); |
636 |
|
|
} else |
637 |
|
|
avlist1 = avlist2 = NULL; |
638 |
greg |
2.27 |
if (avlist2 == NULL) { /* no time tracking -- rebuild tree? */ |
639 |
greg |
2.26 |
if (avlist1 != NULL) |
640 |
|
|
free((char *)avlist1); |
641 |
greg |
2.27 |
if (always) { /* rebuild without sorting */ |
642 |
|
|
copystruct(&oldatrunk, &atrunk); |
643 |
|
|
atrunk.alist = NULL; |
644 |
|
|
atrunk.kid = NULL; |
645 |
|
|
unloadatree(&oldatrunk, avinsert); |
646 |
|
|
} |
647 |
greg |
2.26 |
} else { /* sort memory by last access time */ |
648 |
|
|
/* |
649 |
|
|
* Sorting memory is tricky because it isn't contiguous. |
650 |
|
|
* We have to sort an array of pointers by MRA and also |
651 |
|
|
* by memory position. We then copy values in "loops" |
652 |
|
|
* to minimize memory hits. Nevertheless, we will visit |
653 |
greg |
2.27 |
* everyone at least twice, and this is an expensive process |
654 |
greg |
2.26 |
* when we're thrashing, which is when we need to do it. |
655 |
|
|
*/ |
656 |
greg |
2.27 |
#ifdef DEBUG |
657 |
greg |
2.29 |
sprintf(errmsg, "sorting %u ambient values at ambclock=%lu...", |
658 |
|
|
nambvals, ambclock); |
659 |
greg |
2.27 |
eputs(errmsg); |
660 |
|
|
#endif |
661 |
|
|
i_avlist = 0; |
662 |
|
|
unloadatree(&atrunk, av2list); /* empty current tree */ |
663 |
|
|
#ifdef DEBUG |
664 |
|
|
if (i_avlist < nambvals) |
665 |
|
|
error(CONSISTENCY, "missing ambient values in sortambvals"); |
666 |
|
|
#endif |
667 |
greg |
2.26 |
qsort((char *)avlist1, nambvals, sizeof(AMBVAL *), alatcmp); |
668 |
|
|
qsort((char *)avlist2, nambvals, sizeof(AMBVAL *), aposcmp); |
669 |
|
|
for (i = 0; i < nambvals; i++) { |
670 |
greg |
2.27 |
if (avlist1[i] == NULL) |
671 |
greg |
2.26 |
continue; |
672 |
|
|
tap = avlist2[i]; |
673 |
|
|
copystruct(&tav, tap); |
674 |
|
|
for (j = i; (pnext = avlist1[j]) != tap; |
675 |
greg |
2.27 |
j = avlmemi(pnext)) { |
676 |
greg |
2.26 |
copystruct(avlist2[j], pnext); |
677 |
|
|
avinsert(avlist2[j]); |
678 |
|
|
avlist1[j] = NULL; |
679 |
|
|
} |
680 |
|
|
copystruct(avlist2[j], &tav); |
681 |
|
|
avinsert(avlist2[j]); |
682 |
|
|
avlist1[j] = NULL; |
683 |
|
|
} |
684 |
|
|
free((char *)avlist1); |
685 |
|
|
free((char *)avlist2); |
686 |
greg |
2.28 |
/* compute new sort interval */ |
687 |
|
|
sortintvl = ambclock - lastsort; |
688 |
greg |
2.32 |
if (sortintvl >= MAX_SORT_INTVL/2) |
689 |
greg |
2.28 |
sortintvl = MAX_SORT_INTVL; |
690 |
|
|
else |
691 |
greg |
2.26 |
sortintvl <<= 1; /* wait twice as long next */ |
692 |
greg |
2.27 |
#ifdef DEBUG |
693 |
|
|
eputs("done\n"); |
694 |
|
|
#endif |
695 |
greg |
2.26 |
} |
696 |
|
|
if (ambclock >= MAXACLOCK) |
697 |
|
|
ambclock = MAXACLOCK/2; |
698 |
|
|
lastsort = ambclock; |
699 |
greg |
2.20 |
} |
700 |
|
|
|
701 |
|
|
|
702 |
greg |
2.18 |
#ifdef F_SETLKW |
703 |
greg |
2.10 |
|
704 |
greg |
2.19 |
static |
705 |
|
|
aflock(typ) /* lock/unlock ambient file */ |
706 |
|
|
int typ; |
707 |
|
|
{ |
708 |
|
|
static struct flock fls; /* static so initialized to zeroes */ |
709 |
|
|
|
710 |
|
|
fls.l_type = typ; |
711 |
|
|
if (fcntl(fileno(ambfp), F_SETLKW, &fls) < 0) |
712 |
|
|
error(SYSTEM, "cannot (un)lock ambient file"); |
713 |
|
|
} |
714 |
|
|
|
715 |
|
|
|
716 |
greg |
2.16 |
int |
717 |
greg |
2.7 |
ambsync() /* synchronize ambient file */ |
718 |
|
|
{ |
719 |
|
|
static FILE *ambinp = NULL; |
720 |
greg |
2.15 |
static long lastpos = -1; |
721 |
|
|
long flen; |
722 |
greg |
2.12 |
AMBVAL avs; |
723 |
greg |
2.7 |
register int n; |
724 |
greg |
2.16 |
|
725 |
|
|
if (nunflshed == 0) |
726 |
|
|
return(0); |
727 |
greg |
2.19 |
if (lastpos < 0) /* initializing (locked in initambfile) */ |
728 |
|
|
goto syncend; |
729 |
greg |
2.7 |
/* gain exclusive access */ |
730 |
greg |
2.19 |
aflock(F_WRLCK); |
731 |
greg |
2.7 |
/* see if file has grown */ |
732 |
greg |
2.15 |
if ((flen = lseek(fileno(ambfp), 0L, 2)) < 0) |
733 |
greg |
2.21 |
goto seekerr; |
734 |
greg |
2.15 |
if (n = flen - lastpos) { /* file has grown */ |
735 |
greg |
2.17 |
if (ambinp == NULL) { /* use duplicate filedes */ |
736 |
|
|
ambinp = fdopen(dup(fileno(ambfp)), "r"); |
737 |
greg |
2.14 |
if (ambinp == NULL) |
738 |
greg |
2.17 |
error(SYSTEM, "fdopen failed in ambsync"); |
739 |
greg |
2.14 |
} |
740 |
greg |
2.15 |
if (fseek(ambinp, lastpos, 0) < 0) |
741 |
greg |
2.21 |
goto seekerr; |
742 |
greg |
2.15 |
while (n >= AMBVALSIZ) { /* load contributed values */ |
743 |
greg |
2.37 |
if (!readambval(&avs, ambinp)) { |
744 |
|
|
sprintf(errmsg, |
745 |
|
|
"ambient file corrupted near character %ld", |
746 |
|
|
flen - n); |
747 |
|
|
error(WARNING, errmsg); |
748 |
|
|
break; |
749 |
|
|
} |
750 |
greg |
2.21 |
avinsert(avstore(&avs)); |
751 |
greg |
2.15 |
n -= AMBVALSIZ; |
752 |
|
|
} |
753 |
greg |
2.22 |
/*** seek always as safety measure |
754 |
|
|
if (n) ***/ /* alignment */ |
755 |
greg |
2.21 |
if (lseek(fileno(ambfp), flen-n, 0) < 0) |
756 |
|
|
goto seekerr; |
757 |
greg |
2.7 |
} |
758 |
greg |
2.21 |
#ifdef DEBUG |
759 |
|
|
if (ambfp->_ptr - ambfp->_base != nunflshed*AMBVALSIZ) { |
760 |
|
|
sprintf(errmsg, "ambient file buffer at %d rather than %d", |
761 |
|
|
ambfp->_ptr - ambfp->_base, |
762 |
|
|
nunflshed*AMBVALSIZ); |
763 |
|
|
error(CONSISTENCY, errmsg); |
764 |
|
|
} |
765 |
|
|
#endif |
766 |
greg |
2.15 |
syncend: |
767 |
greg |
2.7 |
n = fflush(ambfp); /* calls write() at last */ |
768 |
greg |
2.21 |
if ((lastpos = lseek(fileno(ambfp), 0L, 1)) < 0) |
769 |
|
|
goto seekerr; |
770 |
greg |
2.19 |
aflock(F_UNLCK); /* release file */ |
771 |
greg |
2.16 |
nunflshed = 0; |
772 |
greg |
2.7 |
return(n); |
773 |
greg |
2.21 |
seekerr: |
774 |
|
|
error(SYSTEM, "seek failed in ambsync"); |
775 |
greg |
2.18 |
} |
776 |
|
|
|
777 |
|
|
#else |
778 |
|
|
|
779 |
|
|
int |
780 |
|
|
ambsync() /* flush ambient file */ |
781 |
|
|
{ |
782 |
|
|
if (nunflshed == 0) |
783 |
|
|
return(0); |
784 |
|
|
nunflshed = 0; |
785 |
|
|
return(fflush(ambfp)); |
786 |
greg |
1.1 |
} |
787 |
greg |
2.10 |
|
788 |
|
|
#endif |