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root/radiance/ray/src/px/pinterp.c
Revision: 2.25
Committed: Fri Sep 15 22:04:04 1995 UTC (28 years, 7 months ago) by greg
Content type: text/plain
Branch: MAIN
Changes since 2.24: +8 -8 lines
Log Message: 
minor modifications

File Contents

# User Rev Content
1 greg 2.24 /* Copyright (c) 1995 Regents of the University of California */
2 greg 1.34
3 greg 1.1 #ifndef lint
4     static char SCCSid[] = "$SunId$ LBL";
5     #endif
6    
7     /*
8     * Interpolate and extrapolate pictures with different view parameters.
9     *
10     * Greg Ward 09Dec89
11     */
12    
13     #include "standard.h"
14    
15 greg 2.3 #include <ctype.h>
16    
17 greg 1.1 #include "view.h"
18    
19     #include "color.h"
20    
21 greg 1.34 #include "resolu.h"
22    
23 greg 2.21 #define LOG2 0.69314718055994530942
24    
25 greg 1.17 #define pscan(y) (ourpict+(y)*hresolu)
26 greg 2.19 #define sscan(y) (ourspict+(y)*hresolu)
27     #define wscan(y) (ourweigh+(y)*hresolu)
28 greg 1.17 #define zscan(y) (ourzbuf+(y)*hresolu)
29 greg 2.24 #define bscan(y) (ourbpict+(y)*hresolu)
30 greg 2.19 #define averaging (ourweigh != NULL)
31 greg 2.24 #define blurring (ourbpict != NULL)
32 greg 2.22 #define usematrix (hasmatrix & !averaging)
33     #define zisnorm (!usematrix | ourview.type != VT_PER)
34 greg 1.1
35 greg 2.20 #define MAXWT 1000. /* maximum pixel weight (averaging) */
36 greg 2.19
37 greg 1.13 #define F_FORE 1 /* fill foreground */
38     #define F_BACK 2 /* fill background */
39 greg 1.11
40 greg 2.3 #define PACKSIZ 256 /* max. calculation packet size */
41 greg 1.13
42 greg 2.4 #define RTCOM "rtrace -h- -ovl -fff "
43 greg 1.13
44 greg 1.3 #define ABS(x) ((x)>0?(x):-(x))
45    
46 greg 1.15 struct position {int x,y; float z;};
47    
48 greg 2.16 #define NSTEPS 64 /* number steps in overlap prescan */
49     #define MINSTEP 4 /* minimum worthwhile preview step */
50    
51     struct bound {int min,max;};
52    
53 greg 1.17 VIEW ourview = STDVIEW; /* desired view */
54     int hresolu = 512; /* horizontal resolution */
55     int vresolu = 512; /* vertical resolution */
56 greg 1.18 double pixaspect = 1.0; /* pixel aspect ratio */
57 greg 1.1
58 greg 1.8 double zeps = .02; /* allowed z epsilon */
59 greg 1.1
60 greg 2.19 COLR *ourpict; /* output picture (COLR's) */
61 greg 2.20 COLOR *ourspict; /* output pixel sums (averaging) */
62     float *ourweigh = NULL; /* output pixel weights (averaging) */
63 greg 1.1 float *ourzbuf; /* corresponding z-buffer */
64 greg 2.25 COLOR *ourbpict = NULL; /* blurred picture (view averaging) */
65 greg 1.1
66 greg 2.24 VIEW avgview; /* average view for -B option */
67     int nvavg; /* number of views averaged */
68    
69 greg 1.1 char *progname;
70    
71 greg 1.25 int fillo = F_FORE|F_BACK; /* selected fill options */
72 greg 1.26 int fillsamp = 0; /* sample separation (0 == inf) */
73 greg 1.14 extern int backfill(), rcalfill(); /* fill functions */
74 greg 1.25 int (*fillfunc)() = backfill; /* selected fill function */
75 greg 1.11 COLR backcolr = BLKCOLR; /* background color */
76 greg 2.19 COLOR backcolor = BLKCOLOR; /* background color (float) */
77 greg 1.13 double backz = 0.0; /* background z value */
78 greg 2.22 int normdist = 1; /* i/o normalized distance? */
79 greg 2.21 double ourexp = -1; /* original picture exposure */
80     int expadj = 0; /* exposure adjustment (f-stops) */
81     double rexpadj = 1; /* real exposure adjustment */
82 greg 1.11
83 greg 2.24 VIEW theirview; /* input view */
84 greg 1.16 int gotview; /* got input view? */
85 greg 1.33 int wrongformat = 0; /* input in another format? */
86 greg 1.34 RESOLU tresolu; /* input resolution */
87 greg 1.17 double theirexp; /* input picture exposure */
88 greg 2.19 MAT4 theirs2ours; /* transformation matrix */
89 greg 1.30 int hasmatrix = 0; /* has transformation matrix */
90 greg 1.1
91 greg 2.3 int PDesc[3] = {-1,-1,-1}; /* rtrace process descriptor */
92     #define childpid (PDesc[2])
93     unsigned short queue[PACKSIZ][2]; /* pending pixels */
94     int packsiz; /* actual packet size */
95 greg 1.13 int queuesiz; /* number of pixels pending */
96 greg 1.5
97 greg 2.19 extern double movepixel();
98 greg 1.13
99 greg 2.19
100 greg 1.1 main(argc, argv) /* interpolate pictures */
101     int argc;
102     char *argv[];
103     {
104 greg 2.24 #define check(ol,al) if (argv[an][ol] || \
105     badarg(argc-an-1,argv+an+1,al)) \
106 greg 2.3 goto badopt
107 greg 1.1 int gotvfile = 0;
108 greg 2.19 int doavg = -1;
109 greg 2.24 int doblur = 0;
110 greg 1.11 char *zfile = NULL;
111 greg 2.21 char *expcomp = NULL;
112 greg 2.24 int i, an, rval;
113 greg 1.1
114     progname = argv[0];
115    
116 greg 2.24 for (an = 1; an < argc && argv[an][0] == '-'; an++) {
117     rval = getviewopt(&ourview, argc-an, argv+an);
118 greg 1.17 if (rval >= 0) {
119 greg 2.24 an += rval;
120 greg 1.17 continue;
121     }
122 greg 2.24 switch (argv[an][1]) {
123 greg 2.21 case 'e': /* exposure */
124     check(2,"f");
125 greg 2.24 expcomp = argv[++an];
126 greg 2.21 break;
127 greg 1.1 case 't': /* threshold */
128 greg 2.3 check(2,"f");
129 greg 2.24 zeps = atof(argv[++an]);
130 greg 1.1 break;
131 greg 2.19 case 'a': /* average */
132     check(2,NULL);
133     doavg = 1;
134     break;
135 greg 2.24 case 'B': /* blur views */
136     check(2,NULL);
137     doblur = 1;
138     break;
139 greg 2.19 case 'q': /* quick (no avg.) */
140     check(2,NULL);
141     doavg = 0;
142     break;
143 greg 1.11 case 'n': /* dist. normalized? */
144 greg 2.3 check(2,NULL);
145 greg 1.11 normdist = !normdist;
146 greg 1.10 break;
147 greg 1.11 case 'f': /* fill type */
148 greg 2.24 switch (argv[an][2]) {
149 greg 1.11 case '0': /* none */
150 greg 2.3 check(3,NULL);
151 greg 1.25 fillo = 0;
152 greg 1.11 break;
153     case 'f': /* foreground */
154 greg 2.3 check(3,NULL);
155 greg 1.25 fillo = F_FORE;
156 greg 1.11 break;
157     case 'b': /* background */
158 greg 2.3 check(3,NULL);
159 greg 1.25 fillo = F_BACK;
160 greg 1.11 break;
161     case 'a': /* all */
162 greg 2.3 check(3,NULL);
163 greg 1.25 fillo = F_FORE|F_BACK;
164 greg 1.11 break;
165 greg 1.25 case 's': /* sample */
166 greg 2.3 check(3,"i");
167 greg 2.24 fillsamp = atoi(argv[++an]);
168 greg 1.25 break;
169 greg 1.11 case 'c': /* color */
170 greg 2.3 check(3,"fff");
171 greg 1.25 fillfunc = backfill;
172 greg 2.24 setcolor(backcolor, atof(argv[an+1]),
173     atof(argv[an+2]), atof(argv[an+3]));
174 greg 2.19 setcolr(backcolr, colval(backcolor,RED),
175     colval(backcolor,GRN),
176     colval(backcolor,BLU));
177 greg 2.24 an += 3;
178 greg 1.11 break;
179 greg 1.13 case 'z': /* z value */
180 greg 2.3 check(3,"f");
181 greg 1.25 fillfunc = backfill;
182 greg 2.24 backz = atof(argv[++an]);
183 greg 1.13 break;
184     case 'r': /* rtrace */
185 greg 2.3 check(3,"s");
186 greg 1.25 fillfunc = rcalfill;
187 greg 2.24 calstart(RTCOM, argv[++an]);
188 greg 1.13 break;
189 greg 1.11 default:
190     goto badopt;
191     }
192     break;
193     case 'z': /* z file */
194 greg 2.3 check(2,"s");
195 greg 2.24 zfile = argv[++an];
196 greg 1.11 break;
197 greg 1.6 case 'x': /* x resolution */
198 greg 2.3 check(2,"i");
199 greg 2.24 hresolu = atoi(argv[++an]);
200 greg 1.6 break;
201     case 'y': /* y resolution */
202 greg 2.3 check(2,"i");
203 greg 2.24 vresolu = atoi(argv[++an]);
204 greg 1.6 break;
205 greg 1.18 case 'p': /* pixel aspect */
206 greg 2.24 if (argv[an][2] != 'a')
207 greg 2.6 goto badopt;
208     check(3,"f");
209 greg 2.24 pixaspect = atof(argv[++an]);
210 greg 1.18 break;
211 greg 1.17 case 'v': /* view file */
212 greg 2.24 if (argv[an][2] != 'f')
213 greg 1.1 goto badopt;
214 greg 2.3 check(3,"s");
215 greg 2.24 gotvfile = viewfile(argv[++an], &ourview, 0, 0);
216 greg 2.10 if (gotvfile < 0)
217 greg 2.24 syserror(argv[an]);
218 greg 2.10 else if (gotvfile == 0) {
219 greg 1.17 fprintf(stderr, "%s: bad view file\n",
220 greg 2.24 argv[an]);
221 greg 1.17 exit(1);
222 greg 1.1 }
223     break;
224     default:
225     badopt:
226 greg 1.10 fprintf(stderr, "%s: command line error at '%s'\n",
227 greg 2.24 progname, argv[an]);
228 greg 1.10 goto userr;
229 greg 1.1 }
230 greg 1.17 }
231 greg 1.1 /* check arguments */
232 greg 2.24 if ((argc-an)%2)
233 greg 1.10 goto userr;
234 greg 2.3 if (fillsamp == 1)
235     fillo &= ~F_BACK;
236 greg 2.20 if (doavg < 0)
237 greg 2.24 doavg = (argc-an) > 2;
238 greg 2.21 if (expcomp != NULL)
239     if (expcomp[0] == '+' | expcomp[0] == '-') {
240     expadj = atof(expcomp) + (expcomp[0]=='+' ? .5 : -.5);
241 greg 2.24 if (doavg | doblur)
242 greg 2.21 rexpadj = pow(2.0, atof(expcomp));
243     else
244     rexpadj = pow(2.0, (double)expadj);
245     } else {
246     if (!isflt(expcomp))
247     goto userr;
248     rexpadj = atof(expcomp);
249     expadj = log(rexpadj)/LOG2 + (rexpadj>1 ? .5 : -.5);
250 greg 2.24 if (!(doavg | doblur))
251 greg 2.21 rexpadj = pow(2.0, (double)expadj);
252     }
253 greg 1.1 /* set view */
254 greg 2.24 if (nextview(doblur ? stdin : NULL) == EOF) {
255     fprintf(stderr, "%s: no view on standard input!\n",
256     progname);
257 greg 1.1 exit(1);
258     }
259 greg 1.18 normaspect(viewaspect(&ourview), &pixaspect, &hresolu, &vresolu);
260 greg 1.1 /* allocate frame */
261 greg 2.19 if (doavg) {
262     ourspict = (COLOR *)bmalloc(hresolu*vresolu*sizeof(COLOR));
263     ourweigh = (float *)bmalloc(hresolu*vresolu*sizeof(float));
264     if (ourspict == NULL | ourweigh == NULL)
265     syserror(progname);
266     } else {
267     ourpict = (COLR *)bmalloc(hresolu*vresolu*sizeof(COLR));
268     if (ourpict == NULL)
269     syserror(progname);
270     }
271 greg 2.24 if (doblur) {
272     ourbpict = (COLOR *)bmalloc(hresolu*vresolu*sizeof(COLOR));
273     if (ourbpict == NULL)
274     syserror(progname);
275     }
276 greg 2.7 ourzbuf = (float *)bmalloc(hresolu*vresolu*sizeof(float));
277 greg 2.19 if (ourzbuf == NULL)
278 greg 2.10 syserror(progname);
279 greg 2.13 /* new header */
280     newheader("RADIANCE", stdout);
281 greg 2.24 /* run pictures */
282     do {
283     bzero((char *)ourzbuf, hresolu*vresolu*sizeof(float));
284     for (i = an; i < argc; i += 2)
285     addpicture(argv[i], argv[i+1]);
286     if (fillo&F_BACK) /* fill in spaces */
287     backpicture(fillfunc, fillsamp);
288     else
289     fillpicture(fillfunc);
290     /* aft clipping */
291     clipaft();
292     } while (addblur() && nextview(stdin) != EOF);
293 greg 1.13 /* close calculation */
294 greg 1.14 caldone();
295 greg 1.1 /* add to header */
296     printargs(argc, argv, stdout);
297 greg 2.24 compavgview();
298     if (doblur | gotvfile) {
299 greg 1.25 fputs(VIEWSTR, stdout);
300 greg 2.24 fprintview(&avgview, stdout);
301 greg 1.25 putc('\n', stdout);
302 greg 1.1 }
303 greg 2.21 if (pixaspect < .99 | pixaspect > 1.01)
304 greg 1.18 fputaspect(pixaspect, stdout);
305 greg 2.21 if (ourexp > 0)
306     ourexp *= rexpadj;
307     else
308     ourexp = rexpadj;
309     if (ourexp < .995 | ourexp > 1.005)
310 greg 1.16 fputexpos(ourexp, stdout);
311 greg 1.33 fputformat(COLRFMT, stdout);
312 greg 1.25 putc('\n', stdout);
313 greg 1.11 /* write picture */
314 greg 1.1 writepicture();
315 greg 1.11 /* write z file */
316     if (zfile != NULL)
317     writedistance(zfile);
318 greg 1.1
319     exit(0);
320 greg 1.10 userr:
321     fprintf(stderr,
322 greg 2.24 "Usage: %s [view opts][-t eps][-z zout][-e spec][-B][-a|-q][-fT][-n] pfile zspec ..\n",
323 greg 1.10 progname);
324     exit(1);
325 greg 1.1 #undef check
326     }
327    
328    
329     headline(s) /* process header string */
330     char *s;
331     {
332 greg 1.33 char fmt[32];
333 greg 1.1
334 greg 2.13 if (isheadid(s))
335     return;
336     if (formatval(fmt, s)) {
337 greg 1.33 wrongformat = strcmp(fmt, COLRFMT);
338     return;
339     }
340 greg 2.24 if (nvavg < 2) {
341     putc('\t', stdout);
342     fputs(s, stdout);
343     }
344 greg 1.16 if (isexpos(s)) {
345     theirexp *= exposval(s);
346     return;
347     }
348 greg 2.5 if (isview(s) && sscanview(&theirview, s) > 0)
349     gotview++;
350 greg 1.1 }
351    
352    
353 greg 2.24 nextview(fp) /* get and set next view */
354     FILE *fp;
355     {
356     char linebuf[256];
357     char *err;
358     register int i;
359    
360     if (fp != NULL) {
361     do /* get new view */
362     if (fgets(linebuf, sizeof(linebuf), fp) == NULL)
363     return(EOF);
364     while (!isview(linebuf) || !sscanview(&ourview, linebuf));
365     }
366     /* set new view */
367     if ((err = setview(&ourview)) != NULL) {
368     fprintf(stderr, "%s: %s\n", progname, err);
369     exit(1);
370     }
371     if (!nvavg) { /* first view */
372     copystruct(&avgview, &ourview);
373     return(nvavg++);
374     }
375     /* add to average view */
376     for (i = 0; i < 3; i++) {
377     avgview.vp[i] += ourview.vp[i];
378     avgview.vdir[i] += ourview.vdir[i];
379     avgview.vup[i] += ourview.vup[i];
380     }
381     avgview.horiz += ourview.horiz;
382     avgview.vert += ourview.vert;
383     avgview.hoff += ourview.hoff;
384     avgview.voff += ourview.voff;
385     avgview.vfore += ourview.vfore;
386     avgview.vaft += ourview.vaft;
387     return(nvavg++);
388     }
389    
390    
391     compavgview() /* compute average view */
392     {
393     register int i;
394     double f;
395    
396     if (nvavg < 2)
397     return;
398     f = 1.0/nvavg;
399     for (i = 0; i < 3; i++) {
400     avgview.vp[i] *= f;
401     avgview.vdir[i] *= f;
402     avgview.vup[i] *= f;
403     }
404     avgview.horiz *= f;
405     avgview.vert *= f;
406     avgview.hoff *= f;
407     avgview.voff *= f;
408     avgview.vfore *= f;
409     avgview.vaft *= f;
410     if (setview(&avgview) != NULL) /* in case of emergency... */
411     copystruct(&avgview, &ourview);
412     pixaspect = viewaspect(&avgview) * hresolu / vresolu;
413     }
414    
415    
416 greg 1.10 addpicture(pfile, zspec) /* add picture to output */
417     char *pfile, *zspec;
418 greg 1.1 {
419 greg 1.19 FILE *pfp;
420     int zfd;
421 greg 1.8 char *err;
422 greg 1.1 COLR *scanin;
423 greg 1.15 float *zin;
424     struct position *plast;
425 greg 2.16 struct bound *xlim, ylim;
426 greg 1.1 int y;
427 greg 1.10 /* open picture file */
428 greg 2.10 if ((pfp = fopen(pfile, "r")) == NULL)
429     syserror(pfile);
430 greg 1.16 /* get header with exposure and view */
431     theirexp = 1.0;
432 greg 2.24 copystruct(&theirview, &stdview);
433 greg 1.16 gotview = 0;
434 greg 2.24 if (nvavg < 2)
435     printf("%s:\n", pfile);
436 greg 1.33 getheader(pfp, headline, NULL);
437 greg 1.34 if (wrongformat || !gotview || !fgetsresolu(&tresolu, pfp)) {
438 greg 1.33 fprintf(stderr, "%s: picture format error\n", pfile);
439 greg 1.1 exit(1);
440     }
441 greg 1.16 if (ourexp <= 0)
442     ourexp = theirexp;
443     else if (ABS(theirexp-ourexp) > .01*ourexp)
444     fprintf(stderr, "%s: different exposure (warning)\n", pfile);
445 greg 1.1 if (err = setview(&theirview)) {
446     fprintf(stderr, "%s: %s\n", pfile, err);
447     exit(1);
448     }
449 greg 1.5 /* compute transformation */
450 greg 1.30 hasmatrix = pixform(theirs2ours, &theirview, &ourview);
451 greg 2.16 /* get z specification or file */
452 greg 1.34 zin = (float *)malloc(scanlen(&tresolu)*sizeof(float));
453 greg 2.16 if (zin == NULL)
454 greg 2.10 syserror(progname);
455 greg 1.19 if ((zfd = open(zspec, O_RDONLY)) == -1) {
456 greg 1.10 double zvalue;
457     register int x;
458 greg 2.19 if (!isflt(zspec) || (zvalue = atof(zspec)) <= 0.0)
459 greg 2.10 syserror(zspec);
460 greg 1.34 for (x = scanlen(&tresolu); x-- > 0; )
461 greg 1.10 zin[x] = zvalue;
462     }
463 greg 2.16 /* compute transferrable perimeter */
464     xlim = (struct bound *)malloc(numscans(&tresolu)*sizeof(struct bound));
465     if (xlim == NULL)
466     syserror(progname);
467     if (!getperim(xlim, &ylim, zin, zfd)) { /* overlapping area? */
468     free((char *)zin);
469     free((char *)xlim);
470     if (zfd != -1)
471     close(zfd);
472     fclose(pfp);
473     return;
474     }
475     /* allocate scanlines */
476     scanin = (COLR *)malloc(scanlen(&tresolu)*sizeof(COLR));
477     plast = (struct position *)calloc(scanlen(&tresolu),
478     sizeof(struct position));
479     if (scanin == NULL | plast == NULL)
480     syserror(progname);
481     /* skip to starting point */
482     for (y = 0; y < ylim.min; y++)
483     if (freadcolrs(scanin, scanlen(&tresolu), pfp) < 0) {
484     fprintf(stderr, "%s: read error\n", pfile);
485     exit(1);
486     }
487     if (zfd != -1 && lseek(zfd,
488     (long)ylim.min*scanlen(&tresolu)*sizeof(float), 0) < 0)
489     syserror(zspec);
490 greg 1.1 /* load image */
491 greg 2.16 for (y = ylim.min; y <= ylim.max; y++) {
492 greg 1.34 if (freadcolrs(scanin, scanlen(&tresolu), pfp) < 0) {
493 greg 1.1 fprintf(stderr, "%s: read error\n", pfile);
494     exit(1);
495     }
496 greg 2.16 if (zfd != -1 && read(zfd, (char *)zin,
497 greg 1.34 scanlen(&tresolu)*sizeof(float))
498 greg 2.16 < scanlen(&tresolu)*sizeof(float))
499     syserror(zspec);
500     addscanline(xlim+y, y, scanin, zin, plast);
501 greg 1.1 }
502     /* clean up */
503 greg 2.16 free((char *)xlim);
504 greg 1.1 free((char *)scanin);
505     free((char *)zin);
506 greg 1.9 free((char *)plast);
507 greg 1.1 fclose(pfp);
508 greg 1.19 if (zfd != -1)
509     close(zfd);
510 greg 1.1 }
511    
512    
513 greg 1.5 pixform(xfmat, vw1, vw2) /* compute view1 to view2 matrix */
514 greg 2.19 register MAT4 xfmat;
515 greg 1.5 register VIEW *vw1, *vw2;
516     {
517     double m4t[4][4];
518    
519 greg 2.25 if (vw1->type != VT_PER & vw1->type != VT_PAR)
520 greg 1.30 return(0);
521 greg 2.25 if (vw2->type != VT_PER & vw2->type != VT_PAR)
522 greg 1.30 return(0);
523 greg 1.5 setident4(xfmat);
524 greg 1.17 xfmat[0][0] = vw1->hvec[0];
525     xfmat[0][1] = vw1->hvec[1];
526     xfmat[0][2] = vw1->hvec[2];
527     xfmat[1][0] = vw1->vvec[0];
528     xfmat[1][1] = vw1->vvec[1];
529     xfmat[1][2] = vw1->vvec[2];
530 greg 1.5 xfmat[2][0] = vw1->vdir[0];
531     xfmat[2][1] = vw1->vdir[1];
532     xfmat[2][2] = vw1->vdir[2];
533     xfmat[3][0] = vw1->vp[0];
534     xfmat[3][1] = vw1->vp[1];
535     xfmat[3][2] = vw1->vp[2];
536     setident4(m4t);
537 greg 1.17 m4t[0][0] = vw2->hvec[0]/vw2->hn2;
538     m4t[1][0] = vw2->hvec[1]/vw2->hn2;
539     m4t[2][0] = vw2->hvec[2]/vw2->hn2;
540     m4t[3][0] = -DOT(vw2->vp,vw2->hvec)/vw2->hn2;
541     m4t[0][1] = vw2->vvec[0]/vw2->vn2;
542     m4t[1][1] = vw2->vvec[1]/vw2->vn2;
543     m4t[2][1] = vw2->vvec[2]/vw2->vn2;
544     m4t[3][1] = -DOT(vw2->vp,vw2->vvec)/vw2->vn2;
545 greg 1.5 m4t[0][2] = vw2->vdir[0];
546     m4t[1][2] = vw2->vdir[1];
547     m4t[2][2] = vw2->vdir[2];
548     m4t[3][2] = -DOT(vw2->vp,vw2->vdir);
549     multmat4(xfmat, xfmat, m4t);
550 greg 1.30 return(1);
551 greg 1.5 }
552    
553    
554 greg 2.16 addscanline(xl, y, pline, zline, lasty) /* add scanline to output */
555     struct bound *xl;
556 greg 1.1 int y;
557     COLR *pline;
558     float *zline;
559 greg 1.15 struct position *lasty; /* input/output */
560 greg 1.1 {
561 greg 1.30 FVECT pos;
562 greg 1.15 struct position lastx, newpos;
563 greg 2.19 double wt;
564 greg 1.1 register int x;
565    
566 greg 1.20 lastx.z = 0;
567 greg 2.16 for (x = xl->max; x >= xl->min; x--) {
568 greg 1.34 pix2loc(pos, &tresolu, x, y);
569 greg 1.5 pos[2] = zline[x];
570 greg 2.19 if ((wt = movepixel(pos)) <= FTINY) {
571 greg 1.15 lasty[x].z = lastx.z = 0; /* mark invalid */
572 greg 1.1 continue;
573 greg 1.15 }
574 greg 2.19 /* add pixel to our image */
575 greg 1.17 newpos.x = pos[0] * hresolu;
576     newpos.y = pos[1] * vresolu;
577 greg 1.15 newpos.z = zline[x];
578 greg 2.19 addpixel(&newpos, &lastx, &lasty[x], pline[x], wt, pos[2]);
579     lasty[x].x = lastx.x = newpos.x;
580     lasty[x].y = lastx.y = newpos.y;
581     lasty[x].z = lastx.z = newpos.z;
582 greg 1.1 }
583     }
584    
585    
586 greg 2.19 addpixel(p0, p1, p2, pix, w, z) /* fill in pixel parallelogram */
587 greg 1.15 struct position *p0, *p1, *p2;
588 greg 1.8 COLR pix;
589 greg 2.19 double w;
590 greg 1.8 double z;
591     {
592 greg 1.15 double zt = 2.*zeps*p0->z; /* threshold */
593 greg 2.19 COLOR pval; /* converted+weighted pixel */
594 greg 1.15 int s1x, s1y, s2x, s2y; /* step sizes */
595     int l1, l2, c1, c2; /* side lengths and counters */
596     int p1isy; /* p0p1 along y? */
597     int x1, y1; /* p1 position */
598     register int x, y; /* final position */
599    
600     /* compute vector p0p1 */
601 greg 1.25 if (fillo&F_FORE && ABS(p1->z-p0->z) <= zt) {
602 greg 1.15 s1x = p1->x - p0->x;
603     s1y = p1->y - p0->y;
604     l1 = ABS(s1x);
605     if (p1isy = (ABS(s1y) > l1))
606     l1 = ABS(s1y);
607 greg 2.20 else if (l1 < 1)
608 greg 2.19 l1 = 1;
609 greg 1.15 } else {
610     l1 = s1x = s1y = 1;
611     p1isy = -1;
612     }
613     /* compute vector p0p2 */
614 greg 1.25 if (fillo&F_FORE && ABS(p2->z-p0->z) <= zt) {
615 greg 1.15 s2x = p2->x - p0->x;
616     s2y = p2->y - p0->y;
617     if (p1isy == 1)
618     l2 = ABS(s2x);
619     else {
620     l2 = ABS(s2y);
621     if (p1isy != 0 && ABS(s2x) > l2)
622     l2 = ABS(s2x);
623     }
624 greg 2.19 if (l2 < 1)
625     l2 = 1;
626 greg 1.15 } else
627     l2 = s2x = s2y = 1;
628     /* fill the parallelogram */
629 greg 2.19 if (averaging) {
630     colr_color(pval, pix);
631     scalecolor(pval, w);
632     }
633 greg 1.15 for (c1 = l1; c1-- > 0; ) {
634     x1 = p0->x + c1*s1x/l1;
635     y1 = p0->y + c1*s1y/l1;
636     for (c2 = l2; c2-- > 0; ) {
637     x = x1 + c2*s2x/l2;
638 greg 2.25 if (x < 0 | x >= hresolu)
639 greg 1.28 continue;
640 greg 1.15 y = y1 + c2*s2y/l2;
641 greg 2.25 if (y < 0 | y >= vresolu)
642 greg 1.28 continue;
643 greg 2.19 if (averaging) {
644     if (zscan(y)[x] <= 0 || zscan(y)[x]-z
645 greg 1.15 > zeps*zscan(y)[x]) {
646 greg 2.19 copycolor(sscan(y)[x], pval);
647     wscan(y)[x] = w;
648     zscan(y)[x] = z;
649     } else if (z-zscan(y)[x] <= zeps*zscan(y)[x]) {
650     addcolor(sscan(y)[x], pval);
651     wscan(y)[x] += w;
652     }
653     } else if (zscan(y)[x] <= 0 || zscan(y)[x]-z
654     > zeps*zscan(y)[x]) {
655     copycolr(pscan(y)[x], pix);
656 greg 1.8 zscan(y)[x] = z;
657     }
658 greg 1.15 }
659     }
660 greg 2.16 }
661    
662    
663 greg 2.19 double
664 greg 2.18 movepixel(pos) /* reposition image point */
665 greg 2.20 register FVECT pos;
666 greg 2.18 {
667 greg 2.19 FVECT pt, tdir, odir;
668 greg 2.20 double d;
669 greg 2.19 register int i;
670 greg 2.18
671     if (pos[2] <= 0) /* empty pixel */
672 greg 2.19 return(0);
673 greg 2.22 if (usematrix) {
674 greg 2.18 pos[0] += theirview.hoff - .5;
675     pos[1] += theirview.voff - .5;
676 greg 2.25 if (normdist & theirview.type == VT_PER)
677 greg 2.23 d = sqrt(1. + pos[0]*pos[0]*theirview.hn2
678     + pos[1]*pos[1]*theirview.vn2);
679     else
680     d = 1.;
681     pos[2] += d*theirview.vfore;
682 greg 2.18 if (theirview.type == VT_PER) {
683 greg 2.23 pos[2] /= d;
684 greg 2.18 pos[0] *= pos[2];
685     pos[1] *= pos[2];
686     }
687     multp3(pos, pos, theirs2ours);
688 greg 2.23 if (pos[2] <= ourview.vfore)
689 greg 2.19 return(0);
690 greg 2.18 if (ourview.type == VT_PER) {
691     pos[0] /= pos[2];
692     pos[1] /= pos[2];
693     }
694     pos[0] += .5 - ourview.hoff;
695     pos[1] += .5 - ourview.voff;
696 greg 2.23 pos[2] -= ourview.vfore;
697 greg 2.19 } else {
698     if (viewray(pt, tdir, &theirview, pos[0], pos[1]) < -FTINY)
699     return(0);
700 greg 2.22 if (!normdist & theirview.type == VT_PER) /* adjust */
701 greg 2.20 pos[2] *= sqrt(1. + pos[0]*pos[0]*theirview.hn2
702     + pos[1]*pos[1]*theirview.vn2);
703 greg 2.19 pt[0] += tdir[0]*pos[2];
704     pt[1] += tdir[1]*pos[2];
705     pt[2] += tdir[2]*pos[2];
706     viewloc(pos, &ourview, pt);
707     if (pos[2] <= 0)
708     return(0);
709     }
710 greg 2.25 if (pos[0] < 0 | pos[0] >= 1-FTINY | pos[1] < 0 | pos[1] >= 1-FTINY)
711 greg 2.18 return(0);
712 greg 2.19 if (!averaging)
713     return(1);
714     if (ourview.type == VT_PAR) /* compute our direction */
715     VCOPY(odir, ourview.vdir);
716     else
717     for (i = 0; i < 3; i++)
718     odir[i] = (pt[i] - ourview.vp[i])/pos[2];
719 greg 2.20 d = DOT(odir,tdir); /* compute pixel weight */
720     if (d >= 1.-1./MAXWT/MAXWT)
721 greg 2.19 return(MAXWT); /* clip to maximum weight */
722 greg 2.20 return(1./sqrt(1.-d));
723 greg 2.18 }
724    
725    
726 greg 2.16 getperim(xl, yl, zline, zfd) /* compute overlapping image area */
727     register struct bound *xl;
728     struct bound *yl;
729     float *zline;
730     int zfd;
731     {
732     int step;
733     FVECT pos;
734     register int x, y;
735     /* set up step size */
736     if (scanlen(&tresolu) < numscans(&tresolu))
737     step = scanlen(&tresolu)/NSTEPS;
738     else
739     step = numscans(&tresolu)/NSTEPS;
740     if (step < MINSTEP) { /* not worth cropping? */
741     yl->min = 0;
742     yl->max = numscans(&tresolu) - 1;
743     x = scanlen(&tresolu) - 1;
744     for (y = numscans(&tresolu); y--; ) {
745     xl[y].min = 0;
746     xl[y].max = x;
747     }
748     return(1);
749     }
750     yl->min = 32000; yl->max = 0; /* search for points on image */
751     for (y = step - 1; y < numscans(&tresolu); y += step) {
752     if (zfd != -1) {
753     if (lseek(zfd, (long)y*scanlen(&tresolu)*sizeof(float),
754     0) < 0)
755     syserror("lseek");
756     if (read(zfd, (char *)zline,
757     scanlen(&tresolu)*sizeof(float))
758     < scanlen(&tresolu)*sizeof(float))
759     syserror("read");
760     }
761     xl[y].min = 32000; xl[y].max = 0; /* x max */
762     for (x = scanlen(&tresolu); (x -= step) > 0; ) {
763     pix2loc(pos, &tresolu, x, y);
764     pos[2] = zline[x];
765 greg 2.19 if (movepixel(pos) > FTINY) {
766 greg 2.16 xl[y].max = x + step - 1;
767     xl[y].min = x - step + 1; /* x min */
768     if (xl[y].min < 0)
769     xl[y].min = 0;
770     for (x = step - 1; x < xl[y].max; x += step) {
771     pix2loc(pos, &tresolu, x, y);
772     pos[2] = zline[x];
773 greg 2.19 if (movepixel(pos) > FTINY) {
774 greg 2.16 xl[y].min = x - step + 1;
775     break;
776     }
777     }
778     if (y < yl->min) /* y limits */
779     yl->min = y - step + 1;
780     yl->max = y + step - 1;
781     break;
782     }
783     }
784     /* fill in between */
785 greg 2.18 if (y < step) {
786 greg 2.16 xl[y-1].min = xl[y].min;
787     xl[y-1].max = xl[y].max;
788 greg 2.18 } else {
789     if (xl[y].min < xl[y-step].min)
790     xl[y-1].min = xl[y].min;
791     else
792     xl[y-1].min = xl[y-step].min;
793     if (xl[y].max > xl[y-step].max)
794     xl[y-1].max = xl[y].max;
795     else
796     xl[y-1].max = xl[y-step].max;
797     }
798 greg 2.16 for (x = 2; x < step; x++)
799     copystruct(xl+y-x, xl+y-1);
800     }
801     if (yl->max >= numscans(&tresolu))
802     yl->max = numscans(&tresolu) - 1;
803 greg 2.20 y -= step;
804 greg 2.16 for (x = numscans(&tresolu) - 1; x > y; x--) /* fill bottom rows */
805     copystruct(xl+x, xl+y);
806     return(yl->max >= yl->min);
807 greg 1.8 }
808    
809    
810 greg 1.26 backpicture(fill, samp) /* background fill algorithm */
811 greg 1.25 int (*fill)();
812 greg 1.26 int samp;
813 greg 1.1 {
814 greg 1.2 int *yback, xback;
815 greg 1.1 int y;
816 greg 1.2 register int x, i;
817     /* get back buffer */
818 greg 1.17 yback = (int *)malloc(hresolu*sizeof(int));
819 greg 1.15 if (yback == NULL)
820 greg 2.10 syserror(progname);
821 greg 1.17 for (x = 0; x < hresolu; x++)
822 greg 1.4 yback[x] = -2;
823 greg 1.7 /*
824     * Xback and yback are the pixel locations of suitable
825     * background values in each direction.
826     * A value of -2 means unassigned, and -1 means
827     * that there is no suitable background in this direction.
828     */
829 greg 1.2 /* fill image */
830 greg 1.17 for (y = 0; y < vresolu; y++) {
831 greg 1.4 xback = -2;
832 greg 1.17 for (x = 0; x < hresolu; x++)
833 greg 1.8 if (zscan(y)[x] <= 0) { /* empty pixel */
834 greg 1.7 /*
835     * First, find background from above or below.
836     * (farthest assigned pixel)
837     */
838 greg 1.4 if (yback[x] == -2) {
839 greg 1.17 for (i = y+1; i < vresolu; i++)
840 greg 1.8 if (zscan(i)[x] > 0)
841 greg 1.4 break;
842 greg 1.17 if (i < vresolu
843 greg 1.2 && (y <= 0 || zscan(y-1)[x] < zscan(i)[x]))
844 greg 1.4 yback[x] = i;
845     else
846     yback[x] = y-1;
847 greg 1.2 }
848 greg 1.7 /*
849     * Next, find background from left or right.
850     */
851 greg 1.4 if (xback == -2) {
852 greg 1.17 for (i = x+1; i < hresolu; i++)
853 greg 1.8 if (zscan(y)[i] > 0)
854 greg 1.4 break;
855 greg 1.17 if (i < hresolu
856 greg 1.4 && (x <= 0 || zscan(y)[x-1] < zscan(y)[i]))
857     xback = i;
858     else
859     xback = x-1;
860     }
861 greg 1.7 /*
862 greg 1.26 * If we have no background for this pixel,
863     * use the given fill function.
864 greg 1.11 */
865 greg 1.27 if (xback < 0 && yback[x] < 0)
866     goto fillit;
867 greg 1.11 /*
868 greg 1.7 * Compare, and use the background that is
869     * farther, unless one of them is next to us.
870 greg 1.27 * If the background is too distant, call
871     * the fill function.
872 greg 1.7 */
873 greg 1.11 if ( yback[x] < 0
874     || (xback >= 0 && ABS(x-xback) <= 1)
875 greg 1.4 || ( ABS(y-yback[x]) > 1
876 greg 1.11 && zscan(yback[x])[x]
877 greg 1.13 < zscan(y)[xback] ) ) {
878 greg 1.27 if (samp > 0 && ABS(x-xback) >= samp)
879     goto fillit;
880 greg 2.19 if (averaging) {
881     copycolor(sscan(y)[x],
882     sscan(y)[xback]);
883     wscan(y)[x] = wscan(y)[xback];
884     } else
885     copycolr(pscan(y)[x],
886     pscan(y)[xback]);
887 greg 1.13 zscan(y)[x] = zscan(y)[xback];
888     } else {
889 greg 1.27 if (samp > 0 && ABS(y-yback[x]) > samp)
890     goto fillit;
891 greg 2.19 if (averaging) {
892     copycolor(sscan(y)[x],
893     sscan(yback[x])[x]);
894     wscan(y)[x] =
895     wscan(yback[x])[x];
896     } else
897     copycolr(pscan(y)[x],
898     pscan(yback[x])[x]);
899 greg 1.13 zscan(y)[x] = zscan(yback[x])[x];
900 greg 1.27 }
901     continue;
902     fillit:
903     (*fill)(x,y);
904     if (fill == rcalfill) { /* use it */
905     clearqueue();
906     xback = x;
907     yback[x] = y;
908 greg 1.13 }
909 greg 1.4 } else { /* full pixel */
910     yback[x] = -2;
911     xback = -2;
912     }
913     }
914 greg 1.2 free((char *)yback);
915 greg 1.1 }
916    
917    
918 greg 1.25 fillpicture(fill) /* paint in empty pixels using fill */
919     int (*fill)();
920 greg 1.11 {
921     register int x, y;
922    
923 greg 1.17 for (y = 0; y < vresolu; y++)
924     for (x = 0; x < hresolu; x++)
925 greg 1.11 if (zscan(y)[x] <= 0)
926 greg 1.25 (*fill)(x,y);
927 greg 2.15 }
928    
929    
930     clipaft() /* perform aft clipping as indicated */
931     {
932     register int x, y;
933 greg 2.22 int adjtest = ourview.type == VT_PER & zisnorm;
934 greg 2.15 double tstdist;
935     double yzn2, vx;
936    
937     if (ourview.vaft <= FTINY)
938 greg 2.24 return(0);
939 greg 2.17 tstdist = ourview.vaft - ourview.vfore;
940 greg 2.15 for (y = 0; y < vresolu; y++) {
941 greg 2.22 if (adjtest) { /* adjust test */
942 greg 2.15 yzn2 = (y+.5)/vresolu + ourview.voff - .5;
943     yzn2 = 1. + yzn2*yzn2*ourview.vn2;
944 greg 2.17 tstdist = (ourview.vaft - ourview.vfore)*sqrt(yzn2);
945 greg 2.15 }
946     for (x = 0; x < hresolu; x++)
947     if (zscan(y)[x] > tstdist) {
948 greg 2.22 if (adjtest) {
949 greg 2.15 vx = (x+.5)/hresolu + ourview.hoff - .5;
950 greg 2.17 if (zscan(y)[x] <= (ourview.vaft -
951     ourview.vfore) *
952 greg 2.15 sqrt(vx*vx*ourview.hn2 + yzn2))
953     continue;
954     }
955 greg 2.19 if (averaging)
956     bzero(sscan(y)[x], sizeof(COLOR));
957     else
958     bzero(pscan(y)[x], sizeof(COLR));
959 greg 2.15 zscan(y)[x] = 0.0;
960     }
961     }
962 greg 2.24 return(1);
963 greg 1.11 }
964    
965    
966 greg 2.24 addblur() /* add to blurred picture */
967     {
968     COLOR cval;
969     double d;
970     register int i;
971    
972     if (!blurring)
973     return(0);
974     i = hresolu*vresolu;
975     if (nvavg < 2)
976     if (averaging)
977     while (i--) {
978     copycolor(ourbpict[i], ourspict[i]);
979     d = 1.0/ourweigh[i];
980     scalecolor(ourbpict[i], d);
981     }
982     else
983     while (i--)
984     colr_color(ourbpict[i], ourpict[i]);
985     else
986     if (averaging)
987     while (i--) {
988     copycolor(cval, ourspict[i]);
989     d = 1.0/ourweigh[i];
990     scalecolor(cval, d);
991     addcolor(ourbpict[i], cval);
992     }
993     else
994     while (i--) {
995     colr_color(cval, ourpict[i]);
996     addcolor(ourbpict[i], cval);
997     }
998     /* print view */
999     printf("VIEW%d:", nvavg);
1000     fprintview(&ourview, stdout);
1001     putchar('\n');
1002     return(1);
1003     }
1004    
1005    
1006 greg 2.21 writepicture() /* write out picture (alters buffer) */
1007 greg 1.1 {
1008     int y;
1009 greg 2.19 register int x;
1010     double d;
1011 greg 1.1
1012 greg 1.34 fprtresolu(hresolu, vresolu, stdout);
1013 greg 1.17 for (y = vresolu-1; y >= 0; y--)
1014 greg 2.24 if (blurring) {
1015     for (x = 0; x < hresolu; x++) { /* compute avg. */
1016     d = rexpadj/nvavg;
1017     scalecolor(bscan(y)[x], d);
1018     }
1019     if (fwritescan(bscan(y), hresolu, stdout) < 0)
1020     syserror(progname);
1021     } else if (averaging) {
1022 greg 2.19 for (x = 0; x < hresolu; x++) { /* average pixels */
1023 greg 2.21 d = rexpadj/wscan(y)[x];
1024 greg 2.19 scalecolor(sscan(y)[x], d);
1025     }
1026     if (fwritescan(sscan(y), hresolu, stdout) < 0)
1027     syserror(progname);
1028 greg 2.21 } else {
1029     if (expadj)
1030     shiftcolrs(pscan(y), hresolu, expadj);
1031     if (fwritecolrs(pscan(y), hresolu, stdout) < 0)
1032     syserror(progname);
1033     }
1034 greg 1.11 }
1035    
1036    
1037 greg 2.22 writedistance(fname) /* write out z file (alters buffer) */
1038 greg 1.11 char *fname;
1039     {
1040 greg 2.22 int donorm = normdist & !zisnorm ? 1 :
1041     ourview.type == VT_PER & !normdist & zisnorm ? -1 : 0;
1042 greg 1.19 int fd;
1043 greg 1.11 int y;
1044    
1045 greg 2.10 if ((fd = open(fname, O_WRONLY|O_CREAT|O_TRUNC, 0666)) == -1)
1046     syserror(fname);
1047 greg 1.17 for (y = vresolu-1; y >= 0; y--) {
1048 greg 1.11 if (donorm) {
1049 greg 2.22 double vx, yzn2, d;
1050 greg 1.11 register int x;
1051 greg 1.29 yzn2 = (y+.5)/vresolu + ourview.voff - .5;
1052 greg 1.17 yzn2 = 1. + yzn2*yzn2*ourview.vn2;
1053     for (x = 0; x < hresolu; x++) {
1054 greg 1.29 vx = (x+.5)/hresolu + ourview.hoff - .5;
1055 greg 2.22 d = sqrt(vx*vx*ourview.hn2 + yzn2);
1056     if (donorm > 0)
1057     zscan(y)[x] *= d;
1058     else
1059     zscan(y)[x] /= d;
1060 greg 1.11 }
1061 greg 2.22 }
1062     if (write(fd, (char *)zscan(y), hresolu*sizeof(float))
1063 greg 2.10 < hresolu*sizeof(float))
1064     syserror(fname);
1065 greg 1.11 }
1066 greg 1.19 close(fd);
1067 greg 1.10 }
1068    
1069    
1070 greg 1.12 backfill(x, y) /* fill pixel with background */
1071     int x, y;
1072     {
1073 greg 2.19 if (averaging) {
1074     copycolor(sscan(y)[x], backcolor);
1075     wscan(y)[x] = 1;
1076     } else
1077     copycolr(pscan(y)[x], backcolr);
1078 greg 1.13 zscan(y)[x] = backz;
1079     }
1080    
1081    
1082 greg 2.3 calstart(prog, args) /* start fill calculation */
1083 greg 1.13 char *prog, *args;
1084     {
1085     char combuf[512];
1086 greg 2.3 char *argv[64];
1087     int rval;
1088     register char **wp, *cp;
1089 greg 1.13
1090 greg 1.14 if (childpid != -1) {
1091     fprintf(stderr, "%s: too many calculations\n", progname);
1092     exit(1);
1093     }
1094 greg 2.3 strcpy(combuf, prog);
1095     strcat(combuf, args);
1096     cp = combuf;
1097     wp = argv;
1098     for ( ; ; ) {
1099 greg 2.11 while (isspace(*cp)) /* nullify spaces */
1100     *cp++ = '\0';
1101     if (!*cp) /* all done? */
1102     break;
1103     *wp++ = cp; /* add argument to list */
1104     while (*++cp && !isspace(*cp))
1105     ;
1106 greg 2.3 }
1107     *wp = NULL;
1108     /* start process */
1109     if ((rval = open_process(PDesc, argv)) < 0)
1110 greg 2.10 syserror(progname);
1111 greg 2.3 if (rval == 0) {
1112     fprintf(stderr, "%s: command not found\n", argv[0]);
1113     exit(1);
1114 greg 1.13 }
1115 greg 2.3 packsiz = rval/(6*sizeof(float)) - 1;
1116     if (packsiz > PACKSIZ)
1117     packsiz = PACKSIZ;
1118 greg 1.13 queuesiz = 0;
1119     }
1120    
1121    
1122 greg 2.3 caldone() /* done with calculation */
1123 greg 1.13 {
1124 greg 1.14 if (childpid == -1)
1125     return;
1126 greg 1.25 clearqueue();
1127 greg 2.3 close_process(PDesc);
1128 greg 1.14 childpid = -1;
1129 greg 1.13 }
1130    
1131    
1132 greg 1.14 rcalfill(x, y) /* fill with ray-calculated pixel */
1133 greg 1.13 int x, y;
1134     {
1135 greg 2.3 if (queuesiz >= packsiz) /* flush queue if needed */
1136 greg 1.25 clearqueue();
1137 greg 1.22 /* add position to queue */
1138 greg 1.13 queue[queuesiz][0] = x;
1139     queue[queuesiz][1] = y;
1140     queuesiz++;
1141     }
1142    
1143    
1144 greg 1.25 clearqueue() /* process queue */
1145 greg 1.13 {
1146 greg 1.22 FVECT orig, dir;
1147 greg 2.3 float fbuf[6*(PACKSIZ+1)];
1148     register float *fbp;
1149 greg 1.13 register int i;
1150 greg 2.22 double vx, vy;
1151 greg 1.13
1152 greg 2.10 if (queuesiz == 0)
1153     return;
1154 greg 2.3 fbp = fbuf;
1155 greg 1.13 for (i = 0; i < queuesiz; i++) {
1156 greg 1.22 viewray(orig, dir, &ourview,
1157     (queue[i][0]+.5)/hresolu,
1158     (queue[i][1]+.5)/vresolu);
1159 greg 2.3 *fbp++ = orig[0]; *fbp++ = orig[1]; *fbp++ = orig[2];
1160     *fbp++ = dir[0]; *fbp++ = dir[1]; *fbp++ = dir[2];
1161 greg 1.22 }
1162 greg 2.3 /* mark end and get results */
1163     bzero((char *)fbp, 6*sizeof(float));
1164     if (process(PDesc, fbuf, fbuf, 4*sizeof(float)*queuesiz,
1165     6*sizeof(float)*(queuesiz+1)) !=
1166     4*sizeof(float)*queuesiz) {
1167     fprintf(stderr, "%s: error reading from rtrace process\n",
1168     progname);
1169     exit(1);
1170     }
1171     fbp = fbuf;
1172 greg 1.22 for (i = 0; i < queuesiz; i++) {
1173 greg 1.16 if (ourexp > 0 && ourexp != 1.0) {
1174 greg 2.3 fbp[0] *= ourexp;
1175     fbp[1] *= ourexp;
1176     fbp[2] *= ourexp;
1177 greg 1.14 }
1178 greg 2.19 if (averaging) {
1179     setcolor(sscan(queue[i][1])[queue[i][0]],
1180     fbp[0], fbp[1], fbp[2]);
1181 greg 2.25 wscan(queue[i][1])[queue[i][0]] = MAXWT;
1182 greg 2.19 } else
1183     setcolr(pscan(queue[i][1])[queue[i][0]],
1184     fbp[0], fbp[1], fbp[2]);
1185 greg 2.22 if (zisnorm)
1186     zscan(queue[i][1])[queue[i][0]] = fbp[3];
1187     else {
1188     vx = (queue[i][0]+.5)/hresolu + ourview.hoff - .5;
1189     vy = (queue[i][1]+.5)/vresolu + ourview.voff - .5;
1190     zscan(queue[i][1])[queue[i][0]] = fbp[3] / sqrt(1. +
1191     vx*vx*ourview.hn2 + vy*vy*ourview.vn2);
1192     }
1193 greg 2.3 fbp += 4;
1194 greg 1.13 }
1195     queuesiz = 0;
1196 greg 1.14 }
1197    
1198    
1199 greg 2.10 syserror(s) /* report error and exit */
1200     char *s;
1201 greg 1.14 {
1202 greg 2.10 perror(s);
1203 greg 1.14 exit(1);
1204 greg 1.1 }