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root/radiance/ray/src/hd/rholo2.c
Revision: 3.24
Committed: Mon Jun 30 14:59:12 2003 UTC (20 years, 9 months ago) by schorsch
Content type: text/plain
Branch: MAIN
Changes since 3.23: +2 -2 lines
Log Message:
Replaced most outdated BSD function calls with their posix equivalents, and cleaned up a few other platform dependencies.

File Contents

# Content
1 #ifndef lint
2 static const char RCSid[] = "$Id: rholo2.c,v 3.23 2003/06/26 00:58:10 schorsch Exp $";
3 #endif
4 /*
5 * Rtrace support routines for holodeck rendering
6 */
7
8 #include "rholo.h"
9 #include "paths.h"
10 #include "random.h"
11
12
13 VIEWPOINT myeye; /* target view position */
14
15 struct gclim {
16 HOLO *hp; /* holodeck pointer */
17 GCOORD gc; /* grid cell */
18 FVECT egp; /* eye grid point */
19 double erg2; /* mean square eye grid range */
20 double gmin[2], gmax[2]; /* grid coordinate limits */
21 }; /* a grid coordinate range */
22
23
24 static
25 initeyelim(gcl, hp, gc) /* initialize grid coordinate limits */
26 register struct gclim *gcl;
27 register HOLO *hp;
28 GCOORD *gc;
29 {
30 register RREAL *v;
31 register int i;
32
33 if (hp != NULL) {
34 hdgrid(gcl->egp, gcl->hp = hp, myeye.vpt);
35 gcl->erg2 = 0;
36 for (i = 0, v = hp->wg[0]; i < 3; i++, v += 3)
37 gcl->erg2 += DOT(v,v);
38 gcl->erg2 *= (1./3.) * myeye.rng*myeye.rng;
39 }
40 if (gc != NULL)
41 copystruct(&gcl->gc, gc);
42 gcl->gmin[0] = gcl->gmin[1] = FHUGE;
43 gcl->gmax[0] = gcl->gmax[1] = -FHUGE;
44 }
45
46
47 static
48 groweyelim(gcl, gc, r0, r1, tight) /* grow grid limits about eye point */
49 register struct gclim *gcl;
50 GCOORD *gc;
51 double r0, r1;
52 int tight;
53 {
54 FVECT gp, ab;
55 double ab2, od, cfact;
56 double sqcoef[3], ctcoef[3], licoef[3], cnst;
57 int gw, gi[2];
58 double wallpos, a, b, c, d, e, f;
59 double root[2], yex;
60 int n, i, j, nex;
61 /* point/view cone */
62 i = gc->w>>1;
63 gp[i] = gc->w&1 ? gcl->hp->grid[i] : 0;
64 gp[hdwg0[gc->w]] = gc->i[0] + r0;
65 gp[hdwg1[gc->w]] = gc->i[1] + r1;
66 VSUB(ab, gcl->egp, gp);
67 ab2 = DOT(ab, ab);
68 gw = gcl->gc.w>>1;
69 if ((i==gw ? ab[gw]*ab[gw] : ab2) <= gcl->erg2 + FTINY) {
70 gcl->gmin[0] = gcl->gmin[1] = -FHUGE;
71 gcl->gmax[0] = gcl->gmax[1] = FHUGE;
72 return; /* too close (to wall) */
73 }
74 ab2 = 1./ab2; /* 1/norm2(ab) */
75 od = DOT(gp, ab); /* origin dot direction */
76 cfact = 1./(1. - ab2*gcl->erg2); /* tan^2 + 1 of cone angle */
77 for (i = 0; i < 3; i++) { /* compute cone equation */
78 sqcoef[i] = ab[i]*ab[i]*cfact*ab2 - 1.;
79 ctcoef[i] = 2.*ab[i]*ab[(i+1)%3]*cfact*ab2;
80 licoef[i] = 2.*(gp[i] - ab[i]*cfact*od*ab2);
81 }
82 cnst = cfact*od*od*ab2 - DOT(gp,gp);
83 /*
84 * CONE: sqcoef[0]*x*x + sqcoef[1]*y*y + sqcoef[2]*z*z
85 * + ctcoef[0]*x*y + ctcoef[1]*y*z + ctcoef[2]*z*x
86 * + licoef[0]*x + licoef[1]*y + licoef[2]*z + cnst == 0
87 */
88 /* equation for conic section in plane */
89 gi[0] = hdwg0[gcl->gc.w];
90 gi[1] = hdwg1[gcl->gc.w];
91 wallpos = gcl->gc.w&1 ? gcl->hp->grid[gw] : 0;
92 a = sqcoef[gi[0]]; /* x2 */
93 b = ctcoef[gi[0]]; /* xy */
94 c = sqcoef[gi[1]]; /* y2 */
95 d = ctcoef[gw]*wallpos + licoef[gi[0]]; /* x */
96 e = ctcoef[gi[1]]*wallpos + licoef[gi[1]]; /* y */
97 f = wallpos*(wallpos*sqcoef[gw] + licoef[gw]) + cnst;
98 for (i = 0; i < 2; i++) {
99 if (i) { /* swap x and y coefficients */
100 register double t;
101 t = a; a = c; c = t;
102 t = d; d = e; e = t;
103 }
104 nex = 0; /* check global extrema */
105 n = quadratic(root, a*(4.*a*c-b*b), 2.*a*(2.*c*d-b*e),
106 d*(c*d-b*e) + f*b*b);
107 while (n-- > 0) {
108 if (gc->w>>1 == gi[i] &&
109 (gc->w&1) ^ root[n] < gp[gc->w>>1]) {
110 if (gc->w&1)
111 gcl->gmin[i] = -FHUGE;
112 else
113 gcl->gmax[i] = FHUGE;
114 nex++;
115 continue; /* hyperbolic */
116 }
117 if (tight) {
118 yex = (-2.*a*root[n] - d)/b;
119 if (yex < gcl->gc.i[1-i] ||
120 yex > gcl->gc.i[1-i]+1)
121 continue; /* outside cell */
122 }
123 if (root[n] < gcl->gmin[i])
124 gcl->gmin[i] = root[n];
125 if (root[n] > gcl->gmax[i])
126 gcl->gmax[i] = root[n];
127 nex++;
128 }
129 /* check local extrema */
130 for (j = nex < 2 ? 2 : 0; j--; ) {
131 yex = gcl->gc.i[1-i] + j;
132 n = quadratic(root, a, b*yex+d, yex*(yex*c+e)+f);
133 while (n-- > 0) {
134 if (gc->w>>1 == gi[i] &&
135 (gc->w&1) ^ root[n] < gp[gc->w>>1])
136 continue;
137 if (root[n] < gcl->gmin[i])
138 gcl->gmin[i] = root[n];
139 if (root[n] > gcl->gmax[i])
140 gcl->gmax[i] = root[n];
141 }
142 }
143 }
144 }
145
146
147 static int
148 clipeyelim(rrng, gcl) /* clip eye limits to grid cell */
149 register short rrng[2][2];
150 register struct gclim *gcl;
151 {
152 int incell = 1;
153 register int i;
154
155 for (i = 0; i < 2; i++) {
156 if (gcl->gmin[i] < gcl->gc.i[i])
157 gcl->gmin[i] = gcl->gc.i[i];
158 if (gcl->gmax[i] > gcl->gc.i[i]+1)
159 gcl->gmax[i] = gcl->gc.i[i]+1;
160 if (gcl->gmax[i] > gcl->gmin[i]) {
161 rrng[i][0] = 256.*(gcl->gmin[i] - gcl->gc.i[i]) +
162 (1.-FTINY);
163 rrng[i][1] = 256.*(gcl->gmax[i] - gcl->gc.i[i]) +
164 (1.-FTINY) - rrng[i][0];
165 } else
166 rrng[i][0] = rrng[i][1] = 0;
167 incell &= rrng[i][1] > 0;
168 }
169 return(incell);
170 }
171
172
173 packrays(rod, p) /* pack ray origins and directions */
174 register float *rod;
175 register PACKET *p;
176 {
177 #if 0
178 double dist2sum = 0.;
179 FVECT vt;
180 #endif
181 int nretries = p->nr + 2;
182 struct gclim eyelim;
183 short rrng0[2][2], rrng1[2][2];
184 int useyelim;
185 GCOORD gc[2];
186 FVECT ro, rd;
187 double d;
188 register int i;
189
190 if (!hdbcoord(gc, hdlist[p->hd], p->bi))
191 error(CONSISTENCY, "bad beam index in packrays");
192 if ((useyelim = myeye.rng > FTINY)) {
193 initeyelim(&eyelim, hdlist[p->hd], gc);
194 groweyelim(&eyelim, gc+1, 0., 0., 0);
195 groweyelim(&eyelim, gc+1, 1., 1., 0);
196 useyelim = clipeyelim(rrng0, &eyelim);
197 #ifdef DEBUG
198 if (!useyelim)
199 error(WARNING, "no eye overlap in packrays");
200 #endif
201 }
202 for (i = 0; i < p->nr; i++) {
203 retry:
204 if (useyelim) {
205 initeyelim(&eyelim, NULL, gc+1);
206 p->ra[i].r[0][0] = (int)(frandom()*rrng0[0][1])
207 + rrng0[0][0];
208 p->ra[i].r[0][1] = (int)(frandom()*rrng0[1][1])
209 + rrng0[1][0];
210 groweyelim(&eyelim, gc,
211 (1./256.)*(p->ra[i].r[0][0]+.5),
212 (1./256.)*(p->ra[i].r[0][1]+.5), 1);
213 if (!clipeyelim(rrng1, &eyelim)) {
214 useyelim = nretries-- > 0;
215 #ifdef DEBUG
216 if (!useyelim)
217 error(WARNING,
218 "exceeded retry limit in packrays");
219 #endif
220 goto retry;
221 }
222 p->ra[i].r[1][0] = (int)(frandom()*rrng1[0][1])
223 + rrng1[0][0];
224 p->ra[i].r[1][1] = (int)(frandom()*rrng1[1][1])
225 + rrng1[1][0];
226 } else {
227 p->ra[i].r[0][0] = frandom() * 256.;
228 p->ra[i].r[0][1] = frandom() * 256.;
229 p->ra[i].r[1][0] = frandom() * 256.;
230 p->ra[i].r[1][1] = frandom() * 256.;
231 }
232 d = hdray(ro, rd, hdlist[p->hd], gc, p->ra[i].r);
233 #if 0
234 VSUM(vt, ro, rd, d);
235 dist2sum += dist2line(myeye.vpt, ro, vt);
236 #endif
237 if (p->offset != NULL) {
238 if (!vdef(OBSTRUCTIONS))
239 d *= frandom(); /* random offset */
240 VSUM(ro, ro, rd, d); /* advance ray */
241 p->offset[i] = d;
242 }
243 VCOPY(rod, ro);
244 rod += 3;
245 VCOPY(rod, rd);
246 rod += 3;
247 }
248 #if 0
249 fprintf(stderr, "%f RMS (%d retries)\t", sqrt(dist2sum/p->nr),
250 p->nr + 2 - nretries);
251 #endif
252 }
253
254
255 donerays(p, rvl) /* encode finished ray computations */
256 register PACKET *p;
257 register float *rvl;
258 {
259 double d;
260 register int i;
261
262 for (i = 0; i < p->nr; i++) {
263 setcolr(p->ra[i].v, rvl[0], rvl[1], rvl[2]);
264 d = rvl[3];
265 if (p->offset != NULL)
266 d += p->offset[i];
267 p->ra[i].d = hdcode(hdlist[p->hd], d);
268 rvl += 4;
269 }
270 p->nc += p->nr;
271 }
272
273
274 int
275 done_rtrace() /* clean up and close rtrace calculation */
276 {
277 int status;
278 /* already closed? */
279 if (!nprocs)
280 return;
281 /* flush beam queue */
282 done_packets(flush_queue());
283 /* sync holodeck */
284 hdsync(NULL, 1);
285 /* close rtrace */
286 if ((status = end_rtrace()))
287 error(WARNING, "bad exit status from rtrace");
288 if (vdef(REPORT)) { /* report time */
289 eputs("rtrace process closed\n");
290 report(0);
291 }
292 return(status); /* return status */
293 }
294
295
296 new_rtrace() /* restart rtrace calculation */
297 {
298 char combuf[128];
299
300 if (nprocs > 0) /* already running? */
301 return;
302 starttime = time(NULL); /* reset start time and counts */
303 npacksdone = nraysdone = 0L;
304 if (vdef(TIME)) /* reset end time */
305 endtime = starttime + vflt(TIME)*3600. + .5;
306 if (vdef(RIF)) { /* rerun rad to update octree */
307 sprintf(combuf, "rad -v 0 -s -w %s", vval(RIF));
308 if (system(combuf))
309 error(WARNING, "error running rad");
310 }
311 if (start_rtrace() < 1) /* start rtrace */
312 error(WARNING, "cannot restart rtrace");
313 else if (vdef(REPORT)) {
314 eputs("rtrace process restarted\n");
315 report(0);
316 }
317 }
318
319
320 getradfile() /* run rad and get needed variables */
321 {
322 static short mvar[] = {OCTREE,EYESEP,-1};
323 static char tf1[] = TEMPLATE;
324 char tf2[64];
325 char combuf[256];
326 char *pippt;
327 register int i;
328 register char *cp;
329 /* check if rad file specified */
330 if (!vdef(RIF))
331 return(0);
332 /* create rad command */
333 mktemp(tf1);
334 sprintf(tf2, "%s.rif", tf1);
335 sprintf(combuf,
336 "rad -v 0 -s -e -w %s OPTFILE=%s | egrep '^[ \t]*(NOMATCH",
337 vval(RIF), tf1);
338 cp = combuf;
339 while (*cp){
340 if (*cp == '|') pippt = cp;
341 cp++;
342 } /* match unset variables */
343 for (i = 0; mvar[i] >= 0; i++)
344 if (!vdef(mvar[i])) {
345 *cp++ = '|';
346 strcpy(cp, vnam(mvar[i]));
347 while (*cp) cp++;
348 pippt = NULL;
349 }
350 if (pippt != NULL)
351 strcpy(pippt, "> " NULL_DEVICE); /* nothing to match */
352 else
353 sprintf(cp, ")[ \t]*=' > %s", tf2);
354 #ifdef DEBUG
355 wputs(combuf); wputs("\n");
356 #endif
357 system(combuf); /* ignore exit code */
358 if (pippt == NULL) {
359 loadvars(tf2); /* load variables */
360 unlink(tf2);
361 }
362 rtargc += wordfile(rtargv+rtargc, tf1); /* get rtrace options */
363 unlink(tf1); /* clean up */
364 return(1);
365 }
366
367
368 report(t) /* report progress so far */
369 time_t t;
370 {
371 static time_t seconds2go = 1000000;
372
373 if (t == 0L)
374 t = time(NULL);
375 sprintf(errmsg, "%ld packets (%ld rays) done after %.2f hours\n",
376 npacksdone, nraysdone, (t-starttime)/3600.);
377 eputs(errmsg);
378 if (seconds2go == 1000000)
379 seconds2go = vdef(REPORT) ? (long)(vflt(REPORT)*60. + .5) : 0L;
380 if (seconds2go)
381 reporttime = t + seconds2go;
382 }