1 |
greg |
2.12 |
/* Copyright (c) 1992 Regents of the University of California */ |
2 |
greg |
1.1 |
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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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* 5/9/86 |
11 |
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*/ |
12 |
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13 |
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#include "ray.h" |
14 |
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15 |
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#include "octree.h" |
16 |
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17 |
greg |
1.8 |
#include "otypes.h" |
18 |
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|
19 |
greg |
1.14 |
#include "ambient.h" |
20 |
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21 |
greg |
1.1 |
#include "random.h" |
22 |
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|
23 |
greg |
2.12 |
#define OCTSCALE 0.5 /* ceil((valid rad.)/(cube size)) */ |
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 |
2.12 |
#define MAXASET 511 /* maximum number of elements in ambient set */ |
33 |
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OBJECT ambset[MAXASET+1]={0}; /* ambient include/exclude set */ |
34 |
greg |
1.1 |
|
35 |
greg |
2.12 |
double maxarad; /* maximum ambient radius */ |
36 |
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double minarad; /* minimum ambient radius */ |
37 |
greg |
1.1 |
|
38 |
greg |
2.12 |
static AMBTREE atrunk; /* our ambient trunk node */ |
39 |
greg |
1.1 |
|
40 |
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static FILE *ambfp = NULL; /* ambient file pointer */ |
41 |
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|
42 |
greg |
2.12 |
#define AMBFLUSH (BUFSIZ/AMBVALSIZ) |
43 |
greg |
2.6 |
|
44 |
greg |
2.12 |
#define newambval() (AMBVAL *)bmalloc(sizeof(AMBVAL)) |
45 |
greg |
1.1 |
|
46 |
greg |
2.12 |
#define newambtree() (AMBTREE *)calloc(8, sizeof(AMBTREE)) |
47 |
greg |
1.1 |
|
48 |
greg |
2.7 |
extern long ftell(), lseek(); |
49 |
greg |
2.10 |
static int initambfile(), avsave(), avinsert(), ambsync(); |
50 |
greg |
1.1 |
|
51 |
greg |
2.7 |
|
52 |
greg |
2.3 |
setambres(ar) /* set ambient resolution */ |
53 |
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int ar; |
54 |
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{ |
55 |
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/* set min & max radii */ |
56 |
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if (ar <= 0) { |
57 |
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minarad = 0.0; |
58 |
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maxarad = thescene.cusize / 2.0; |
59 |
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} else { |
60 |
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minarad = thescene.cusize / ar; |
61 |
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maxarad = 16.0 * minarad; /* heuristic */ |
62 |
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if (maxarad > thescene.cusize / 2.0) |
63 |
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maxarad = thescene.cusize / 2.0; |
64 |
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} |
65 |
greg |
2.4 |
if (maxarad <= FTINY) |
66 |
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maxarad = .001; |
67 |
greg |
2.3 |
} |
68 |
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69 |
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70 |
greg |
1.1 |
setambient(afile) /* initialize calculation */ |
71 |
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char *afile; |
72 |
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{ |
73 |
greg |
2.9 |
long headlen; |
74 |
greg |
2.12 |
AMBVAL amb; |
75 |
greg |
2.3 |
/* init ambient limits */ |
76 |
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setambres(ambres); |
77 |
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/* open ambient file */ |
78 |
greg |
2.10 |
if (afile != NULL) |
79 |
greg |
1.1 |
if ((ambfp = fopen(afile, "r+")) != NULL) { |
80 |
greg |
2.6 |
initambfile(0); |
81 |
greg |
2.9 |
headlen = ftell(ambfp); |
82 |
greg |
2.5 |
while (readambval(&amb, ambfp)) |
83 |
greg |
1.1 |
avinsert(&amb, &atrunk, thescene.cuorg, |
84 |
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thescene.cusize); |
85 |
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/* align */ |
86 |
greg |
2.9 |
fseek(ambfp, -((ftell(ambfp)-headlen)%AMBVALSIZ), 1); |
87 |
greg |
2.10 |
} else if ((ambfp = fopen(afile, "w+")) != NULL) |
88 |
greg |
2.6 |
initambfile(1); |
89 |
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else { |
90 |
greg |
1.1 |
sprintf(errmsg, "cannot open ambient file \"%s\"", |
91 |
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afile); |
92 |
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error(SYSTEM, errmsg); |
93 |
greg |
1.8 |
} |
94 |
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} |
95 |
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96 |
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97 |
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ambnotify(obj) /* record new modifier */ |
98 |
greg |
2.12 |
OBJECT obj; |
99 |
greg |
1.8 |
{ |
100 |
greg |
1.11 |
static int hitlimit = 0; |
101 |
greg |
2.12 |
register OBJREC *o = objptr(obj); |
102 |
greg |
1.8 |
register char **amblp; |
103 |
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|
104 |
greg |
1.11 |
if (hitlimit || !ismodifier(o->otype)) |
105 |
greg |
1.8 |
return; |
106 |
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for (amblp = amblist; *amblp != NULL; amblp++) |
107 |
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if (!strcmp(o->oname, *amblp)) { |
108 |
greg |
1.11 |
if (ambset[0] >= MAXASET) { |
109 |
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error(WARNING, "too many modifiers in ambient list"); |
110 |
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hitlimit++; |
111 |
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return; /* should this be fatal? */ |
112 |
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} |
113 |
greg |
1.8 |
insertelem(ambset, obj); |
114 |
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return; |
115 |
greg |
1.1 |
} |
116 |
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} |
117 |
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118 |
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119 |
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ambient(acol, r) /* compute ambient component for ray */ |
120 |
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COLOR acol; |
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 |
greg |
2.12 |
double d; |
125 |
greg |
1.1 |
|
126 |
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if (ambdiv <= 0) /* no ambient calculation */ |
127 |
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goto dumbamb; |
128 |
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/* check number of bounces */ |
129 |
greg |
1.16 |
if (rdepth >= ambounce) |
130 |
greg |
1.1 |
goto dumbamb; |
131 |
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/* check ambient list */ |
132 |
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if (ambincl != -1 && r->ro != NULL && |
133 |
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ambincl != inset(ambset, r->ro->omod)) |
134 |
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goto dumbamb; |
135 |
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136 |
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if (ambacc <= FTINY) { /* no ambient storage */ |
137 |
greg |
1.16 |
rdepth++; |
138 |
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d = doambient(acol, r, r->rweight, NULL, NULL); |
139 |
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rdepth--; |
140 |
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if (d == 0.0) |
141 |
greg |
1.1 |
goto dumbamb; |
142 |
greg |
1.16 |
return; |
143 |
greg |
1.1 |
} |
144 |
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/* get ambient value */ |
145 |
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setcolor(acol, 0.0, 0.0, 0.0); |
146 |
greg |
1.16 |
d = sumambient(acol, r, rdepth, |
147 |
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&atrunk, thescene.cuorg, thescene.cusize); |
148 |
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if (d > FTINY) |
149 |
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scalecolor(acol, 1.0/d); |
150 |
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else { |
151 |
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d = makeambient(acol, r, rdepth++); |
152 |
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rdepth--; |
153 |
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} |
154 |
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if (d > FTINY) |
155 |
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return; |
156 |
greg |
1.1 |
dumbamb: /* return global value */ |
157 |
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copycolor(acol, ambval); |
158 |
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} |
159 |
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160 |
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161 |
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double |
162 |
greg |
1.16 |
sumambient(acol, r, al, at, c0, s) /* get interpolated ambient value */ |
163 |
greg |
1.1 |
COLOR acol; |
164 |
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register RAY *r; |
165 |
greg |
1.16 |
int al; |
166 |
greg |
2.12 |
AMBTREE *at; |
167 |
greg |
1.1 |
FVECT c0; |
168 |
greg |
2.12 |
double s; |
169 |
greg |
1.1 |
{ |
170 |
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extern double sqrt(); |
171 |
greg |
2.12 |
double d, e1, e2, wt, wsum; |
172 |
greg |
1.1 |
COLOR ct; |
173 |
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FVECT ck0; |
174 |
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int i; |
175 |
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register int j; |
176 |
greg |
2.12 |
register AMBVAL *av; |
177 |
greg |
1.7 |
/* do this node */ |
178 |
greg |
1.1 |
wsum = 0.0; |
179 |
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for (av = at->alist; av != NULL; av = av->next) { |
180 |
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/* |
181 |
greg |
1.16 |
* Ambient level test. |
182 |
greg |
1.1 |
*/ |
183 |
greg |
1.16 |
if (av->lvl > al || av->weight < r->rweight-FTINY) |
184 |
greg |
1.1 |
continue; |
185 |
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/* |
186 |
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* Ambient radius test. |
187 |
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*/ |
188 |
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e1 = 0.0; |
189 |
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for (j = 0; j < 3; j++) { |
190 |
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d = av->pos[j] - r->rop[j]; |
191 |
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e1 += d * d; |
192 |
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} |
193 |
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e1 /= av->rad * av->rad; |
194 |
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if (e1 > ambacc*ambacc*1.21) |
195 |
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continue; |
196 |
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/* |
197 |
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* Normal direction test. |
198 |
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*/ |
199 |
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e2 = (1.0 - DOT(av->dir, r->ron)) * r->rweight; |
200 |
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if (e2 < 0.0) e2 = 0.0; |
201 |
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if (e1 + e2 > ambacc*ambacc*1.21) |
202 |
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continue; |
203 |
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/* |
204 |
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* Ray behind test. |
205 |
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*/ |
206 |
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d = 0.0; |
207 |
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for (j = 0; j < 3; j++) |
208 |
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d += (r->rop[j] - av->pos[j]) * |
209 |
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(av->dir[j] + r->ron[j]); |
210 |
greg |
1.18 |
if (d*0.5 < -minarad*ambacc-.001) |
211 |
greg |
1.1 |
continue; |
212 |
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/* |
213 |
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* Jittering final test reduces image artifacts. |
214 |
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*/ |
215 |
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wt = sqrt(e1) + sqrt(e2); |
216 |
greg |
2.2 |
wt *= .9 + .2*urand(9015+samplendx); |
217 |
greg |
1.6 |
if (wt > ambacc) |
218 |
greg |
1.1 |
continue; |
219 |
|
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if (wt <= 1e-3) |
220 |
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wt = 1e3; |
221 |
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else |
222 |
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wt = 1.0 / wt; |
223 |
|
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wsum += wt; |
224 |
greg |
1.15 |
extambient(ct, av, r->rop, r->ron); |
225 |
greg |
1.1 |
scalecolor(ct, wt); |
226 |
|
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addcolor(acol, ct); |
227 |
greg |
1.7 |
} |
228 |
|
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if (at->kid == NULL) |
229 |
|
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return(wsum); |
230 |
|
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/* do children */ |
231 |
|
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s *= 0.5; |
232 |
|
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for (i = 0; i < 8; i++) { |
233 |
|
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for (j = 0; j < 3; j++) { |
234 |
|
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ck0[j] = c0[j]; |
235 |
|
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if (1<<j & i) |
236 |
|
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ck0[j] += s; |
237 |
|
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if (r->rop[j] < ck0[j] - OCTSCALE*s) |
238 |
|
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break; |
239 |
|
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if (r->rop[j] > ck0[j] + (1.0+OCTSCALE)*s) |
240 |
|
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break; |
241 |
|
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} |
242 |
|
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if (j == 3) |
243 |
greg |
1.16 |
wsum += sumambient(acol, r, al, at->kid+i, ck0, s); |
244 |
greg |
1.1 |
} |
245 |
|
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return(wsum); |
246 |
|
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} |
247 |
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|
248 |
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|
249 |
|
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double |
250 |
greg |
1.16 |
makeambient(acol, r, al) /* make a new ambient value */ |
251 |
greg |
1.1 |
COLOR acol; |
252 |
|
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register RAY *r; |
253 |
greg |
1.16 |
int al; |
254 |
greg |
1.1 |
{ |
255 |
greg |
2.12 |
AMBVAL amb; |
256 |
greg |
1.14 |
FVECT gp, gd; |
257 |
greg |
1.16 |
/* compute weight */ |
258 |
|
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amb.weight = pow(AVGREFL, (double)al); |
259 |
greg |
1.17 |
if (r->rweight < 0.2*amb.weight) /* heuristic */ |
260 |
greg |
1.16 |
amb.weight = r->rweight; |
261 |
|
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/* compute ambient */ |
262 |
|
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amb.rad = doambient(acol, r, amb.weight, gp, gd); |
263 |
greg |
1.1 |
if (amb.rad == 0.0) |
264 |
|
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return(0.0); |
265 |
|
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/* store it */ |
266 |
|
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VCOPY(amb.pos, r->rop); |
267 |
|
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VCOPY(amb.dir, r->ron); |
268 |
greg |
1.16 |
amb.lvl = al; |
269 |
greg |
1.1 |
copycolor(amb.val, acol); |
270 |
greg |
1.14 |
VCOPY(amb.gpos, gp); |
271 |
|
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VCOPY(amb.gdir, gd); |
272 |
greg |
1.1 |
/* insert into tree */ |
273 |
greg |
2.7 |
avsave(&amb); /* and save to file */ |
274 |
greg |
1.1 |
return(amb.rad); |
275 |
greg |
1.15 |
} |
276 |
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|
277 |
|
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|
278 |
|
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extambient(cr, ap, pv, nv) /* extrapolate value at pv, nv */ |
279 |
|
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COLOR cr; |
280 |
greg |
2.12 |
register AMBVAL *ap; |
281 |
greg |
1.15 |
FVECT pv, nv; |
282 |
|
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{ |
283 |
|
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FVECT v1, v2; |
284 |
|
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register int i; |
285 |
greg |
2.12 |
double d; |
286 |
greg |
1.15 |
|
287 |
|
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d = 1.0; /* zeroeth order */ |
288 |
|
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/* gradient due to translation */ |
289 |
|
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for (i = 0; i < 3; i++) |
290 |
|
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d += ap->gpos[i]*(pv[i]-ap->pos[i]); |
291 |
|
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/* gradient due to rotation */ |
292 |
|
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VCOPY(v1, ap->dir); |
293 |
|
|
fcross(v2, v1, nv); |
294 |
|
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d += DOT(ap->gdir, v2); |
295 |
|
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if (d <= 0.0) { |
296 |
|
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setcolor(cr, 0.0, 0.0, 0.0); |
297 |
|
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return; |
298 |
|
|
} |
299 |
|
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copycolor(cr, ap->val); |
300 |
|
|
scalecolor(cr, d); |
301 |
greg |
1.1 |
} |
302 |
|
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|
303 |
|
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|
304 |
|
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static |
305 |
greg |
2.9 |
initambfile(creat) /* initialize ambient file */ |
306 |
|
|
int creat; |
307 |
|
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{ |
308 |
|
|
extern char *progname, *octname, VersionID[]; |
309 |
|
|
|
310 |
greg |
2.12 |
#ifdef MSDOS |
311 |
|
|
setmode(fileno(ambfp), O_BINARY); |
312 |
|
|
#endif |
313 |
greg |
2.9 |
setbuf(ambfp, bmalloc(BUFSIZ)); |
314 |
|
|
if (creat) { /* new file */ |
315 |
|
|
fprintf(ambfp, "%s -av %g %g %g -ab %d -aa %g ", |
316 |
|
|
progname, colval(ambval,RED), |
317 |
|
|
colval(ambval,GRN), colval(ambval,BLU), |
318 |
|
|
ambounce, ambacc); |
319 |
|
|
fprintf(ambfp, "-ad %d -as %d -ar %d %s\n", |
320 |
|
|
ambdiv, ambssamp, ambres, |
321 |
|
|
octname==NULL ? "" : octname); |
322 |
|
|
fprintf(ambfp, "SOFTWARE= %s\n", VersionID); |
323 |
|
|
fputformat(AMBFMT, ambfp); |
324 |
|
|
putc('\n', ambfp); |
325 |
|
|
putambmagic(ambfp); |
326 |
|
|
fflush(ambfp); |
327 |
greg |
2.12 |
#ifndef NIX |
328 |
greg |
2.11 |
sync(); /* protect against NFS buffering */ |
329 |
|
|
#endif |
330 |
greg |
2.10 |
} else if (checkheader(ambfp, AMBFMT, NULL) < 0 || !hasambmagic(ambfp)) |
331 |
|
|
error(USER, "bad ambient file"); |
332 |
greg |
2.9 |
} |
333 |
|
|
|
334 |
|
|
|
335 |
|
|
static |
336 |
greg |
2.7 |
avsave(av) /* insert and save an ambient value */ |
337 |
greg |
2.12 |
AMBVAL *av; |
338 |
greg |
1.1 |
{ |
339 |
|
|
static int nunflshed = 0; |
340 |
greg |
2.6 |
|
341 |
greg |
2.7 |
avinsert(av, &atrunk, thescene.cuorg, thescene.cusize); |
342 |
greg |
1.1 |
if (ambfp == NULL) |
343 |
|
|
return; |
344 |
greg |
2.5 |
if (writambval(av, ambfp) < 0) |
345 |
greg |
1.1 |
goto writerr; |
346 |
|
|
if (++nunflshed >= AMBFLUSH) { |
347 |
greg |
2.7 |
if (ambsync() == EOF) |
348 |
greg |
1.1 |
goto writerr; |
349 |
|
|
nunflshed = 0; |
350 |
|
|
} |
351 |
|
|
return; |
352 |
|
|
writerr: |
353 |
|
|
error(SYSTEM, "error writing ambient file"); |
354 |
|
|
} |
355 |
|
|
|
356 |
|
|
|
357 |
|
|
static |
358 |
|
|
avinsert(aval, at, c0, s) /* insert ambient value in a tree */ |
359 |
greg |
2.12 |
AMBVAL *aval; |
360 |
greg |
1.1 |
register AMBTREE *at; |
361 |
|
|
FVECT c0; |
362 |
greg |
2.12 |
double s; |
363 |
greg |
1.1 |
{ |
364 |
|
|
FVECT ck0; |
365 |
|
|
int branch; |
366 |
greg |
2.12 |
register AMBVAL *av; |
367 |
greg |
1.1 |
register int i; |
368 |
|
|
|
369 |
|
|
if ((av = newambval()) == NULL) |
370 |
|
|
goto memerr; |
371 |
greg |
1.9 |
copystruct(av, aval); |
372 |
greg |
1.1 |
VCOPY(ck0, c0); |
373 |
|
|
while (s*(OCTSCALE/2) > av->rad*ambacc) { |
374 |
|
|
if (at->kid == NULL) |
375 |
|
|
if ((at->kid = newambtree()) == NULL) |
376 |
|
|
goto memerr; |
377 |
|
|
s *= 0.5; |
378 |
|
|
branch = 0; |
379 |
|
|
for (i = 0; i < 3; i++) |
380 |
|
|
if (av->pos[i] > ck0[i] + s) { |
381 |
|
|
ck0[i] += s; |
382 |
|
|
branch |= 1 << i; |
383 |
|
|
} |
384 |
|
|
at = at->kid + branch; |
385 |
|
|
} |
386 |
|
|
av->next = at->alist; |
387 |
|
|
at->alist = av; |
388 |
|
|
return; |
389 |
|
|
memerr: |
390 |
|
|
error(SYSTEM, "out of memory in avinsert"); |
391 |
greg |
2.7 |
} |
392 |
|
|
|
393 |
|
|
|
394 |
greg |
2.12 |
#ifdef NIX |
395 |
greg |
2.10 |
|
396 |
|
|
static |
397 |
|
|
ambsync() /* flush ambient file */ |
398 |
|
|
{ |
399 |
|
|
return(fflush(ambfp)); |
400 |
|
|
} |
401 |
|
|
|
402 |
|
|
#else |
403 |
|
|
|
404 |
greg |
2.7 |
#include <fcntl.h> |
405 |
greg |
2.10 |
#include <sys/types.h> |
406 |
|
|
#include <sys/stat.h> |
407 |
greg |
2.7 |
|
408 |
|
|
static |
409 |
|
|
ambsync() /* synchronize ambient file */ |
410 |
|
|
{ |
411 |
|
|
static FILE *ambinp = NULL; |
412 |
|
|
struct flock fls; |
413 |
greg |
2.10 |
struct stat sts; |
414 |
greg |
2.12 |
AMBVAL avs; |
415 |
greg |
2.7 |
long lastpos, flen; |
416 |
|
|
register int n; |
417 |
|
|
/* gain exclusive access */ |
418 |
|
|
fls.l_type = F_WRLCK; |
419 |
|
|
fls.l_whence = 0; |
420 |
|
|
fls.l_start = 0L; |
421 |
|
|
fls.l_len = 0L; |
422 |
|
|
if (fcntl(fileno(ambfp), F_SETLKW, &fls) < 0) |
423 |
|
|
error(SYSTEM, "cannot lock ambient file"); |
424 |
|
|
/* see if file has grown */ |
425 |
greg |
2.9 |
lastpos = lseek(fileno(ambfp), 0L, 1); /* get previous position */ |
426 |
greg |
2.10 |
if (fstat(fileno(ambfp), &sts) < 0) /* get current length */ |
427 |
|
|
error(SYSTEM, "cannot stat ambient file"); |
428 |
|
|
flen = sts.st_size; |
429 |
greg |
2.7 |
if (n = (flen - lastpos)/AMBVALSIZ) { /* file has grown */ |
430 |
greg |
2.10 |
if (ambinp == NULL) /* use duplicate file */ |
431 |
|
|
ambinp = fdopen(dup(fileno(ambfp)), "r"); |
432 |
greg |
2.7 |
while (n--) { /* load contributed values */ |
433 |
|
|
readambval(&avs, ambinp); |
434 |
|
|
avinsert(&avs,&atrunk,thescene.cuorg,thescene.cusize); |
435 |
greg |
2.10 |
} /* moves shared file pointer */ |
436 |
|
|
if (n = (flen - lastpos)%AMBVALSIZ) /* alignment */ |
437 |
|
|
lseek(fileno(ambfp), flen-n, 0); |
438 |
greg |
2.7 |
} |
439 |
|
|
n = fflush(ambfp); /* calls write() at last */ |
440 |
|
|
fls.l_type = F_UNLCK; /* release file */ |
441 |
|
|
fcntl(fileno(ambfp), F_SETLKW, &fls); |
442 |
|
|
return(n); |
443 |
greg |
1.1 |
} |
444 |
greg |
2.10 |
|
445 |
|
|
#endif |