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root/radiance/ray/src/px/pinterp.c
Revision: 2.28
Committed: Mon Jun 24 09:17:47 1996 UTC (27 years, 10 months ago) by greg
Content type: text/plain
Branch: MAIN
Changes since 2.27: +1 -1 lines
Log Message: 
fixed NULL pointer for AIX

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 2.27 char ourfmt[LPICFMT+1] = PICFMT; /* original picture format */
80 greg 2.21 double ourexp = -1; /* original picture exposure */
81     int expadj = 0; /* exposure adjustment (f-stops) */
82     double rexpadj = 1; /* real exposure adjustment */
83 greg 1.11
84 greg 2.24 VIEW theirview; /* input view */
85 greg 1.16 int gotview; /* got input view? */
86 greg 1.33 int wrongformat = 0; /* input in another format? */
87 greg 1.34 RESOLU tresolu; /* input resolution */
88 greg 1.17 double theirexp; /* input picture exposure */
89 greg 2.19 MAT4 theirs2ours; /* transformation matrix */
90 greg 1.30 int hasmatrix = 0; /* has transformation matrix */
91 greg 1.1
92 greg 2.3 int PDesc[3] = {-1,-1,-1}; /* rtrace process descriptor */
93     #define childpid (PDesc[2])
94     unsigned short queue[PACKSIZ][2]; /* pending pixels */
95     int packsiz; /* actual packet size */
96 greg 2.26 int queuesiz = 0; /* number of pixels pending */
97 greg 1.5
98 greg 2.19 extern double movepixel();
99 greg 1.13
100 greg 2.19
101 greg 1.1 main(argc, argv) /* interpolate pictures */
102     int argc;
103     char *argv[];
104     {
105 greg 2.24 #define check(ol,al) if (argv[an][ol] || \
106     badarg(argc-an-1,argv+an+1,al)) \
107 greg 2.3 goto badopt
108 greg 1.1 int gotvfile = 0;
109 greg 2.19 int doavg = -1;
110 greg 2.24 int doblur = 0;
111 greg 1.11 char *zfile = NULL;
112 greg 2.21 char *expcomp = NULL;
113 greg 2.24 int i, an, rval;
114 greg 1.1
115     progname = argv[0];
116    
117 greg 2.24 for (an = 1; an < argc && argv[an][0] == '-'; an++) {
118     rval = getviewopt(&ourview, argc-an, argv+an);
119 greg 1.17 if (rval >= 0) {
120 greg 2.24 an += rval;
121 greg 1.17 continue;
122     }
123 greg 2.24 switch (argv[an][1]) {
124 greg 2.21 case 'e': /* exposure */
125     check(2,"f");
126 greg 2.24 expcomp = argv[++an];
127 greg 2.21 break;
128 greg 1.1 case 't': /* threshold */
129 greg 2.3 check(2,"f");
130 greg 2.24 zeps = atof(argv[++an]);
131 greg 1.1 break;
132 greg 2.19 case 'a': /* average */
133     check(2,NULL);
134     doavg = 1;
135     break;
136 greg 2.24 case 'B': /* blur views */
137     check(2,NULL);
138     doblur = 1;
139     break;
140 greg 2.19 case 'q': /* quick (no avg.) */
141     check(2,NULL);
142     doavg = 0;
143     break;
144 greg 1.11 case 'n': /* dist. normalized? */
145 greg 2.3 check(2,NULL);
146 greg 1.11 normdist = !normdist;
147 greg 1.10 break;
148 greg 1.11 case 'f': /* fill type */
149 greg 2.24 switch (argv[an][2]) {
150 greg 1.11 case '0': /* none */
151 greg 2.3 check(3,NULL);
152 greg 1.25 fillo = 0;
153 greg 1.11 break;
154     case 'f': /* foreground */
155 greg 2.3 check(3,NULL);
156 greg 1.25 fillo = F_FORE;
157 greg 1.11 break;
158     case 'b': /* background */
159 greg 2.3 check(3,NULL);
160 greg 1.25 fillo = F_BACK;
161 greg 1.11 break;
162     case 'a': /* all */
163 greg 2.3 check(3,NULL);
164 greg 1.25 fillo = F_FORE|F_BACK;
165 greg 1.11 break;
166 greg 1.25 case 's': /* sample */
167 greg 2.3 check(3,"i");
168 greg 2.24 fillsamp = atoi(argv[++an]);
169 greg 1.25 break;
170 greg 1.11 case 'c': /* color */
171 greg 2.3 check(3,"fff");
172 greg 1.25 fillfunc = backfill;
173 greg 2.24 setcolor(backcolor, atof(argv[an+1]),
174     atof(argv[an+2]), atof(argv[an+3]));
175 greg 2.19 setcolr(backcolr, colval(backcolor,RED),
176     colval(backcolor,GRN),
177     colval(backcolor,BLU));
178 greg 2.24 an += 3;
179 greg 1.11 break;
180 greg 1.13 case 'z': /* z value */
181 greg 2.3 check(3,"f");
182 greg 1.25 fillfunc = backfill;
183 greg 2.24 backz = atof(argv[++an]);
184 greg 1.13 break;
185     case 'r': /* rtrace */
186 greg 2.3 check(3,"s");
187 greg 1.25 fillfunc = rcalfill;
188 greg 2.24 calstart(RTCOM, argv[++an]);
189 greg 1.13 break;
190 greg 1.11 default:
191     goto badopt;
192     }
193     break;
194     case 'z': /* z file */
195 greg 2.3 check(2,"s");
196 greg 2.24 zfile = argv[++an];
197 greg 1.11 break;
198 greg 1.6 case 'x': /* x resolution */
199 greg 2.3 check(2,"i");
200 greg 2.24 hresolu = atoi(argv[++an]);
201 greg 1.6 break;
202     case 'y': /* y resolution */
203 greg 2.3 check(2,"i");
204 greg 2.24 vresolu = atoi(argv[++an]);
205 greg 1.6 break;
206 greg 1.18 case 'p': /* pixel aspect */
207 greg 2.24 if (argv[an][2] != 'a')
208 greg 2.6 goto badopt;
209     check(3,"f");
210 greg 2.24 pixaspect = atof(argv[++an]);
211 greg 1.18 break;
212 greg 1.17 case 'v': /* view file */
213 greg 2.24 if (argv[an][2] != 'f')
214 greg 1.1 goto badopt;
215 greg 2.3 check(3,"s");
216 greg 2.24 gotvfile = viewfile(argv[++an], &ourview, 0, 0);
217 greg 2.10 if (gotvfile < 0)
218 greg 2.24 syserror(argv[an]);
219 greg 2.10 else if (gotvfile == 0) {
220 greg 1.17 fprintf(stderr, "%s: bad view file\n",
221 greg 2.24 argv[an]);
222 greg 1.17 exit(1);
223 greg 1.1 }
224     break;
225     default:
226     badopt:
227 greg 1.10 fprintf(stderr, "%s: command line error at '%s'\n",
228 greg 2.24 progname, argv[an]);
229 greg 1.10 goto userr;
230 greg 1.1 }
231 greg 1.17 }
232 greg 1.1 /* check arguments */
233 greg 2.24 if ((argc-an)%2)
234 greg 1.10 goto userr;
235 greg 2.3 if (fillsamp == 1)
236     fillo &= ~F_BACK;
237 greg 2.20 if (doavg < 0)
238 greg 2.24 doavg = (argc-an) > 2;
239 greg 2.21 if (expcomp != NULL)
240     if (expcomp[0] == '+' | expcomp[0] == '-') {
241     expadj = atof(expcomp) + (expcomp[0]=='+' ? .5 : -.5);
242 greg 2.24 if (doavg | doblur)
243 greg 2.21 rexpadj = pow(2.0, atof(expcomp));
244     else
245     rexpadj = pow(2.0, (double)expadj);
246     } else {
247     if (!isflt(expcomp))
248     goto userr;
249     rexpadj = atof(expcomp);
250     expadj = log(rexpadj)/LOG2 + (rexpadj>1 ? .5 : -.5);
251 greg 2.24 if (!(doavg | doblur))
252 greg 2.21 rexpadj = pow(2.0, (double)expadj);
253     }
254 greg 1.1 /* set view */
255 greg 2.28 if (nextview(doblur ? stdin : (FILE *)NULL) == EOF) {
256 greg 2.24 fprintf(stderr, "%s: no view on standard input!\n",
257     progname);
258 greg 1.1 exit(1);
259     }
260 greg 1.18 normaspect(viewaspect(&ourview), &pixaspect, &hresolu, &vresolu);
261 greg 1.1 /* allocate frame */
262 greg 2.19 if (doavg) {
263     ourspict = (COLOR *)bmalloc(hresolu*vresolu*sizeof(COLOR));
264     ourweigh = (float *)bmalloc(hresolu*vresolu*sizeof(float));
265     if (ourspict == NULL | ourweigh == NULL)
266     syserror(progname);
267     } else {
268     ourpict = (COLR *)bmalloc(hresolu*vresolu*sizeof(COLR));
269     if (ourpict == NULL)
270     syserror(progname);
271     }
272 greg 2.24 if (doblur) {
273     ourbpict = (COLOR *)bmalloc(hresolu*vresolu*sizeof(COLOR));
274     if (ourbpict == NULL)
275     syserror(progname);
276     }
277 greg 2.7 ourzbuf = (float *)bmalloc(hresolu*vresolu*sizeof(float));
278 greg 2.19 if (ourzbuf == NULL)
279 greg 2.10 syserror(progname);
280 greg 2.13 /* new header */
281     newheader("RADIANCE", stdout);
282 greg 2.24 /* run pictures */
283     do {
284     bzero((char *)ourzbuf, hresolu*vresolu*sizeof(float));
285     for (i = an; i < argc; i += 2)
286     addpicture(argv[i], argv[i+1]);
287     if (fillo&F_BACK) /* fill in spaces */
288     backpicture(fillfunc, fillsamp);
289     else
290     fillpicture(fillfunc);
291     /* aft clipping */
292     clipaft();
293     } while (addblur() && nextview(stdin) != EOF);
294 greg 1.13 /* close calculation */
295 greg 1.14 caldone();
296 greg 1.1 /* add to header */
297     printargs(argc, argv, stdout);
298 greg 2.24 compavgview();
299     if (doblur | gotvfile) {
300 greg 1.25 fputs(VIEWSTR, stdout);
301 greg 2.24 fprintview(&avgview, stdout);
302 greg 1.25 putc('\n', stdout);
303 greg 1.1 }
304 greg 2.21 if (pixaspect < .99 | pixaspect > 1.01)
305 greg 1.18 fputaspect(pixaspect, stdout);
306 greg 2.21 if (ourexp > 0)
307     ourexp *= rexpadj;
308     else
309     ourexp = rexpadj;
310     if (ourexp < .995 | ourexp > 1.005)
311 greg 1.16 fputexpos(ourexp, stdout);
312 greg 2.27 if (strcmp(ourfmt, PICFMT)) /* print format if known */
313     fputformat(ourfmt, stdout);
314 greg 1.25 putc('\n', stdout);
315 greg 1.11 /* write picture */
316 greg 1.1 writepicture();
317 greg 1.11 /* write z file */
318     if (zfile != NULL)
319     writedistance(zfile);
320 greg 1.1
321     exit(0);
322 greg 1.10 userr:
323     fprintf(stderr,
324 greg 2.24 "Usage: %s [view opts][-t eps][-z zout][-e spec][-B][-a|-q][-fT][-n] pfile zspec ..\n",
325 greg 1.10 progname);
326     exit(1);
327 greg 1.1 #undef check
328     }
329    
330    
331     headline(s) /* process header string */
332     char *s;
333     {
334 greg 1.33 char fmt[32];
335 greg 1.1
336 greg 2.13 if (isheadid(s))
337     return;
338     if (formatval(fmt, s)) {
339 greg 2.27 if (globmatch(ourfmt, fmt)) {
340     wrongformat = 0;
341     strcpy(ourfmt, fmt);
342     } else
343     wrongformat = 1;
344 greg 1.33 return;
345     }
346 greg 2.24 if (nvavg < 2) {
347     putc('\t', stdout);
348     fputs(s, stdout);
349     }
350 greg 1.16 if (isexpos(s)) {
351     theirexp *= exposval(s);
352     return;
353     }
354 greg 2.5 if (isview(s) && sscanview(&theirview, s) > 0)
355     gotview++;
356 greg 1.1 }
357    
358    
359 greg 2.24 nextview(fp) /* get and set next view */
360     FILE *fp;
361     {
362     char linebuf[256];
363     char *err;
364     register int i;
365    
366     if (fp != NULL) {
367     do /* get new view */
368     if (fgets(linebuf, sizeof(linebuf), fp) == NULL)
369     return(EOF);
370     while (!isview(linebuf) || !sscanview(&ourview, linebuf));
371     }
372     /* set new view */
373     if ((err = setview(&ourview)) != NULL) {
374     fprintf(stderr, "%s: %s\n", progname, err);
375     exit(1);
376     }
377     if (!nvavg) { /* first view */
378     copystruct(&avgview, &ourview);
379     return(nvavg++);
380     }
381     /* add to average view */
382     for (i = 0; i < 3; i++) {
383     avgview.vp[i] += ourview.vp[i];
384     avgview.vdir[i] += ourview.vdir[i];
385     avgview.vup[i] += ourview.vup[i];
386     }
387     avgview.horiz += ourview.horiz;
388     avgview.vert += ourview.vert;
389     avgview.hoff += ourview.hoff;
390     avgview.voff += ourview.voff;
391     avgview.vfore += ourview.vfore;
392     avgview.vaft += ourview.vaft;
393     return(nvavg++);
394     }
395    
396    
397     compavgview() /* compute average view */
398     {
399     register int i;
400     double f;
401    
402     if (nvavg < 2)
403     return;
404     f = 1.0/nvavg;
405     for (i = 0; i < 3; i++) {
406     avgview.vp[i] *= f;
407     avgview.vdir[i] *= f;
408     avgview.vup[i] *= f;
409     }
410     avgview.horiz *= f;
411     avgview.vert *= f;
412     avgview.hoff *= f;
413     avgview.voff *= f;
414     avgview.vfore *= f;
415     avgview.vaft *= f;
416     if (setview(&avgview) != NULL) /* in case of emergency... */
417     copystruct(&avgview, &ourview);
418     pixaspect = viewaspect(&avgview) * hresolu / vresolu;
419     }
420    
421    
422 greg 1.10 addpicture(pfile, zspec) /* add picture to output */
423     char *pfile, *zspec;
424 greg 1.1 {
425 greg 1.19 FILE *pfp;
426     int zfd;
427 greg 1.8 char *err;
428 greg 1.1 COLR *scanin;
429 greg 1.15 float *zin;
430     struct position *plast;
431 greg 2.16 struct bound *xlim, ylim;
432 greg 1.1 int y;
433 greg 1.10 /* open picture file */
434 greg 2.10 if ((pfp = fopen(pfile, "r")) == NULL)
435     syserror(pfile);
436 greg 1.16 /* get header with exposure and view */
437     theirexp = 1.0;
438 greg 2.24 copystruct(&theirview, &stdview);
439 greg 1.16 gotview = 0;
440 greg 2.24 if (nvavg < 2)
441     printf("%s:\n", pfile);
442 greg 1.33 getheader(pfp, headline, NULL);
443 greg 1.34 if (wrongformat || !gotview || !fgetsresolu(&tresolu, pfp)) {
444 greg 1.33 fprintf(stderr, "%s: picture format error\n", pfile);
445 greg 1.1 exit(1);
446     }
447 greg 1.16 if (ourexp <= 0)
448     ourexp = theirexp;
449     else if (ABS(theirexp-ourexp) > .01*ourexp)
450     fprintf(stderr, "%s: different exposure (warning)\n", pfile);
451 greg 1.1 if (err = setview(&theirview)) {
452     fprintf(stderr, "%s: %s\n", pfile, err);
453     exit(1);
454     }
455 greg 1.5 /* compute transformation */
456 greg 1.30 hasmatrix = pixform(theirs2ours, &theirview, &ourview);
457 greg 2.16 /* get z specification or file */
458 greg 1.34 zin = (float *)malloc(scanlen(&tresolu)*sizeof(float));
459 greg 2.16 if (zin == NULL)
460 greg 2.10 syserror(progname);
461 greg 1.19 if ((zfd = open(zspec, O_RDONLY)) == -1) {
462 greg 1.10 double zvalue;
463     register int x;
464 greg 2.19 if (!isflt(zspec) || (zvalue = atof(zspec)) <= 0.0)
465 greg 2.10 syserror(zspec);
466 greg 1.34 for (x = scanlen(&tresolu); x-- > 0; )
467 greg 1.10 zin[x] = zvalue;
468     }
469 greg 2.16 /* compute transferrable perimeter */
470     xlim = (struct bound *)malloc(numscans(&tresolu)*sizeof(struct bound));
471     if (xlim == NULL)
472     syserror(progname);
473     if (!getperim(xlim, &ylim, zin, zfd)) { /* overlapping area? */
474     free((char *)zin);
475     free((char *)xlim);
476     if (zfd != -1)
477     close(zfd);
478     fclose(pfp);
479     return;
480     }
481     /* allocate scanlines */
482     scanin = (COLR *)malloc(scanlen(&tresolu)*sizeof(COLR));
483     plast = (struct position *)calloc(scanlen(&tresolu),
484     sizeof(struct position));
485     if (scanin == NULL | plast == NULL)
486     syserror(progname);
487     /* skip to starting point */
488     for (y = 0; y < ylim.min; y++)
489     if (freadcolrs(scanin, scanlen(&tresolu), pfp) < 0) {
490     fprintf(stderr, "%s: read error\n", pfile);
491     exit(1);
492     }
493     if (zfd != -1 && lseek(zfd,
494     (long)ylim.min*scanlen(&tresolu)*sizeof(float), 0) < 0)
495     syserror(zspec);
496 greg 1.1 /* load image */
497 greg 2.16 for (y = ylim.min; y <= ylim.max; y++) {
498 greg 1.34 if (freadcolrs(scanin, scanlen(&tresolu), pfp) < 0) {
499 greg 1.1 fprintf(stderr, "%s: read error\n", pfile);
500     exit(1);
501     }
502 greg 2.16 if (zfd != -1 && read(zfd, (char *)zin,
503 greg 1.34 scanlen(&tresolu)*sizeof(float))
504 greg 2.16 < scanlen(&tresolu)*sizeof(float))
505     syserror(zspec);
506     addscanline(xlim+y, y, scanin, zin, plast);
507 greg 1.1 }
508     /* clean up */
509 greg 2.16 free((char *)xlim);
510 greg 1.1 free((char *)scanin);
511     free((char *)zin);
512 greg 1.9 free((char *)plast);
513 greg 1.1 fclose(pfp);
514 greg 1.19 if (zfd != -1)
515     close(zfd);
516 greg 1.1 }
517    
518    
519 greg 1.5 pixform(xfmat, vw1, vw2) /* compute view1 to view2 matrix */
520 greg 2.19 register MAT4 xfmat;
521 greg 1.5 register VIEW *vw1, *vw2;
522     {
523     double m4t[4][4];
524    
525 greg 2.25 if (vw1->type != VT_PER & vw1->type != VT_PAR)
526 greg 1.30 return(0);
527 greg 2.25 if (vw2->type != VT_PER & vw2->type != VT_PAR)
528 greg 1.30 return(0);
529 greg 1.5 setident4(xfmat);
530 greg 1.17 xfmat[0][0] = vw1->hvec[0];
531     xfmat[0][1] = vw1->hvec[1];
532     xfmat[0][2] = vw1->hvec[2];
533     xfmat[1][0] = vw1->vvec[0];
534     xfmat[1][1] = vw1->vvec[1];
535     xfmat[1][2] = vw1->vvec[2];
536 greg 1.5 xfmat[2][0] = vw1->vdir[0];
537     xfmat[2][1] = vw1->vdir[1];
538     xfmat[2][2] = vw1->vdir[2];
539     xfmat[3][0] = vw1->vp[0];
540     xfmat[3][1] = vw1->vp[1];
541     xfmat[3][2] = vw1->vp[2];
542     setident4(m4t);
543 greg 1.17 m4t[0][0] = vw2->hvec[0]/vw2->hn2;
544     m4t[1][0] = vw2->hvec[1]/vw2->hn2;
545     m4t[2][0] = vw2->hvec[2]/vw2->hn2;
546     m4t[3][0] = -DOT(vw2->vp,vw2->hvec)/vw2->hn2;
547     m4t[0][1] = vw2->vvec[0]/vw2->vn2;
548     m4t[1][1] = vw2->vvec[1]/vw2->vn2;
549     m4t[2][1] = vw2->vvec[2]/vw2->vn2;
550     m4t[3][1] = -DOT(vw2->vp,vw2->vvec)/vw2->vn2;
551 greg 1.5 m4t[0][2] = vw2->vdir[0];
552     m4t[1][2] = vw2->vdir[1];
553     m4t[2][2] = vw2->vdir[2];
554     m4t[3][2] = -DOT(vw2->vp,vw2->vdir);
555     multmat4(xfmat, xfmat, m4t);
556 greg 1.30 return(1);
557 greg 1.5 }
558    
559    
560 greg 2.16 addscanline(xl, y, pline, zline, lasty) /* add scanline to output */
561     struct bound *xl;
562 greg 1.1 int y;
563     COLR *pline;
564     float *zline;
565 greg 1.15 struct position *lasty; /* input/output */
566 greg 1.1 {
567 greg 1.30 FVECT pos;
568 greg 1.15 struct position lastx, newpos;
569 greg 2.19 double wt;
570 greg 1.1 register int x;
571    
572 greg 1.20 lastx.z = 0;
573 greg 2.16 for (x = xl->max; x >= xl->min; x--) {
574 greg 1.34 pix2loc(pos, &tresolu, x, y);
575 greg 1.5 pos[2] = zline[x];
576 greg 2.19 if ((wt = movepixel(pos)) <= FTINY) {
577 greg 1.15 lasty[x].z = lastx.z = 0; /* mark invalid */
578 greg 1.1 continue;
579 greg 1.15 }
580 greg 2.19 /* add pixel to our image */
581 greg 1.17 newpos.x = pos[0] * hresolu;
582     newpos.y = pos[1] * vresolu;
583 greg 1.15 newpos.z = zline[x];
584 greg 2.19 addpixel(&newpos, &lastx, &lasty[x], pline[x], wt, pos[2]);
585     lasty[x].x = lastx.x = newpos.x;
586     lasty[x].y = lastx.y = newpos.y;
587     lasty[x].z = lastx.z = newpos.z;
588 greg 1.1 }
589     }
590    
591    
592 greg 2.19 addpixel(p0, p1, p2, pix, w, z) /* fill in pixel parallelogram */
593 greg 1.15 struct position *p0, *p1, *p2;
594 greg 1.8 COLR pix;
595 greg 2.19 double w;
596 greg 1.8 double z;
597     {
598 greg 1.15 double zt = 2.*zeps*p0->z; /* threshold */
599 greg 2.19 COLOR pval; /* converted+weighted pixel */
600 greg 1.15 int s1x, s1y, s2x, s2y; /* step sizes */
601     int l1, l2, c1, c2; /* side lengths and counters */
602     int p1isy; /* p0p1 along y? */
603     int x1, y1; /* p1 position */
604     register int x, y; /* final position */
605    
606     /* compute vector p0p1 */
607 greg 1.25 if (fillo&F_FORE && ABS(p1->z-p0->z) <= zt) {
608 greg 1.15 s1x = p1->x - p0->x;
609     s1y = p1->y - p0->y;
610     l1 = ABS(s1x);
611     if (p1isy = (ABS(s1y) > l1))
612     l1 = ABS(s1y);
613 greg 2.20 else if (l1 < 1)
614 greg 2.19 l1 = 1;
615 greg 1.15 } else {
616     l1 = s1x = s1y = 1;
617     p1isy = -1;
618     }
619     /* compute vector p0p2 */
620 greg 1.25 if (fillo&F_FORE && ABS(p2->z-p0->z) <= zt) {
621 greg 1.15 s2x = p2->x - p0->x;
622     s2y = p2->y - p0->y;
623     if (p1isy == 1)
624     l2 = ABS(s2x);
625     else {
626     l2 = ABS(s2y);
627     if (p1isy != 0 && ABS(s2x) > l2)
628     l2 = ABS(s2x);
629     }
630 greg 2.19 if (l2 < 1)
631     l2 = 1;
632 greg 1.15 } else
633     l2 = s2x = s2y = 1;
634     /* fill the parallelogram */
635 greg 2.19 if (averaging) {
636     colr_color(pval, pix);
637     scalecolor(pval, w);
638     }
639 greg 1.15 for (c1 = l1; c1-- > 0; ) {
640     x1 = p0->x + c1*s1x/l1;
641     y1 = p0->y + c1*s1y/l1;
642     for (c2 = l2; c2-- > 0; ) {
643     x = x1 + c2*s2x/l2;
644 greg 2.25 if (x < 0 | x >= hresolu)
645 greg 1.28 continue;
646 greg 1.15 y = y1 + c2*s2y/l2;
647 greg 2.25 if (y < 0 | y >= vresolu)
648 greg 1.28 continue;
649 greg 2.19 if (averaging) {
650     if (zscan(y)[x] <= 0 || zscan(y)[x]-z
651 greg 1.15 > zeps*zscan(y)[x]) {
652 greg 2.19 copycolor(sscan(y)[x], pval);
653     wscan(y)[x] = w;
654     zscan(y)[x] = z;
655     } else if (z-zscan(y)[x] <= zeps*zscan(y)[x]) {
656     addcolor(sscan(y)[x], pval);
657     wscan(y)[x] += w;
658     }
659     } else if (zscan(y)[x] <= 0 || zscan(y)[x]-z
660     > zeps*zscan(y)[x]) {
661     copycolr(pscan(y)[x], pix);
662 greg 1.8 zscan(y)[x] = z;
663     }
664 greg 1.15 }
665     }
666 greg 2.16 }
667    
668    
669 greg 2.19 double
670 greg 2.18 movepixel(pos) /* reposition image point */
671 greg 2.20 register FVECT pos;
672 greg 2.18 {
673 greg 2.19 FVECT pt, tdir, odir;
674 greg 2.20 double d;
675 greg 2.19 register int i;
676 greg 2.18
677     if (pos[2] <= 0) /* empty pixel */
678 greg 2.19 return(0);
679 greg 2.22 if (usematrix) {
680 greg 2.18 pos[0] += theirview.hoff - .5;
681     pos[1] += theirview.voff - .5;
682 greg 2.25 if (normdist & theirview.type == VT_PER)
683 greg 2.23 d = sqrt(1. + pos[0]*pos[0]*theirview.hn2
684     + pos[1]*pos[1]*theirview.vn2);
685     else
686     d = 1.;
687     pos[2] += d*theirview.vfore;
688 greg 2.18 if (theirview.type == VT_PER) {
689 greg 2.23 pos[2] /= d;
690 greg 2.18 pos[0] *= pos[2];
691     pos[1] *= pos[2];
692     }
693     multp3(pos, pos, theirs2ours);
694 greg 2.23 if (pos[2] <= ourview.vfore)
695 greg 2.19 return(0);
696 greg 2.18 if (ourview.type == VT_PER) {
697     pos[0] /= pos[2];
698     pos[1] /= pos[2];
699     }
700     pos[0] += .5 - ourview.hoff;
701     pos[1] += .5 - ourview.voff;
702 greg 2.23 pos[2] -= ourview.vfore;
703 greg 2.19 } else {
704     if (viewray(pt, tdir, &theirview, pos[0], pos[1]) < -FTINY)
705     return(0);
706 greg 2.22 if (!normdist & theirview.type == VT_PER) /* adjust */
707 greg 2.20 pos[2] *= sqrt(1. + pos[0]*pos[0]*theirview.hn2
708     + pos[1]*pos[1]*theirview.vn2);
709 greg 2.19 pt[0] += tdir[0]*pos[2];
710     pt[1] += tdir[1]*pos[2];
711     pt[2] += tdir[2]*pos[2];
712     viewloc(pos, &ourview, pt);
713     if (pos[2] <= 0)
714     return(0);
715     }
716 greg 2.25 if (pos[0] < 0 | pos[0] >= 1-FTINY | pos[1] < 0 | pos[1] >= 1-FTINY)
717 greg 2.18 return(0);
718 greg 2.19 if (!averaging)
719     return(1);
720     if (ourview.type == VT_PAR) /* compute our direction */
721     VCOPY(odir, ourview.vdir);
722     else
723     for (i = 0; i < 3; i++)
724     odir[i] = (pt[i] - ourview.vp[i])/pos[2];
725 greg 2.20 d = DOT(odir,tdir); /* compute pixel weight */
726     if (d >= 1.-1./MAXWT/MAXWT)
727 greg 2.19 return(MAXWT); /* clip to maximum weight */
728 greg 2.20 return(1./sqrt(1.-d));
729 greg 2.18 }
730    
731    
732 greg 2.16 getperim(xl, yl, zline, zfd) /* compute overlapping image area */
733     register struct bound *xl;
734     struct bound *yl;
735     float *zline;
736     int zfd;
737     {
738     int step;
739     FVECT pos;
740     register int x, y;
741     /* set up step size */
742     if (scanlen(&tresolu) < numscans(&tresolu))
743     step = scanlen(&tresolu)/NSTEPS;
744     else
745     step = numscans(&tresolu)/NSTEPS;
746     if (step < MINSTEP) { /* not worth cropping? */
747     yl->min = 0;
748     yl->max = numscans(&tresolu) - 1;
749     x = scanlen(&tresolu) - 1;
750     for (y = numscans(&tresolu); y--; ) {
751     xl[y].min = 0;
752     xl[y].max = x;
753     }
754     return(1);
755     }
756     yl->min = 32000; yl->max = 0; /* search for points on image */
757     for (y = step - 1; y < numscans(&tresolu); y += step) {
758     if (zfd != -1) {
759     if (lseek(zfd, (long)y*scanlen(&tresolu)*sizeof(float),
760     0) < 0)
761     syserror("lseek");
762     if (read(zfd, (char *)zline,
763     scanlen(&tresolu)*sizeof(float))
764     < scanlen(&tresolu)*sizeof(float))
765     syserror("read");
766     }
767     xl[y].min = 32000; xl[y].max = 0; /* x max */
768     for (x = scanlen(&tresolu); (x -= step) > 0; ) {
769     pix2loc(pos, &tresolu, x, y);
770     pos[2] = zline[x];
771 greg 2.19 if (movepixel(pos) > FTINY) {
772 greg 2.16 xl[y].max = x + step - 1;
773     xl[y].min = x - step + 1; /* x min */
774     if (xl[y].min < 0)
775     xl[y].min = 0;
776     for (x = step - 1; x < xl[y].max; x += step) {
777     pix2loc(pos, &tresolu, x, y);
778     pos[2] = zline[x];
779 greg 2.19 if (movepixel(pos) > FTINY) {
780 greg 2.16 xl[y].min = x - step + 1;
781     break;
782     }
783     }
784     if (y < yl->min) /* y limits */
785     yl->min = y - step + 1;
786     yl->max = y + step - 1;
787     break;
788     }
789     }
790     /* fill in between */
791 greg 2.18 if (y < step) {
792 greg 2.16 xl[y-1].min = xl[y].min;
793     xl[y-1].max = xl[y].max;
794 greg 2.18 } else {
795     if (xl[y].min < xl[y-step].min)
796     xl[y-1].min = xl[y].min;
797     else
798     xl[y-1].min = xl[y-step].min;
799     if (xl[y].max > xl[y-step].max)
800     xl[y-1].max = xl[y].max;
801     else
802     xl[y-1].max = xl[y-step].max;
803     }
804 greg 2.16 for (x = 2; x < step; x++)
805     copystruct(xl+y-x, xl+y-1);
806     }
807     if (yl->max >= numscans(&tresolu))
808     yl->max = numscans(&tresolu) - 1;
809 greg 2.20 y -= step;
810 greg 2.16 for (x = numscans(&tresolu) - 1; x > y; x--) /* fill bottom rows */
811     copystruct(xl+x, xl+y);
812     return(yl->max >= yl->min);
813 greg 1.8 }
814    
815    
816 greg 1.26 backpicture(fill, samp) /* background fill algorithm */
817 greg 1.25 int (*fill)();
818 greg 1.26 int samp;
819 greg 1.1 {
820 greg 1.2 int *yback, xback;
821 greg 1.1 int y;
822 greg 1.2 register int x, i;
823     /* get back buffer */
824 greg 1.17 yback = (int *)malloc(hresolu*sizeof(int));
825 greg 1.15 if (yback == NULL)
826 greg 2.10 syserror(progname);
827 greg 1.17 for (x = 0; x < hresolu; x++)
828 greg 1.4 yback[x] = -2;
829 greg 1.7 /*
830     * Xback and yback are the pixel locations of suitable
831     * background values in each direction.
832     * A value of -2 means unassigned, and -1 means
833     * that there is no suitable background in this direction.
834     */
835 greg 1.2 /* fill image */
836 greg 1.17 for (y = 0; y < vresolu; y++) {
837 greg 1.4 xback = -2;
838 greg 1.17 for (x = 0; x < hresolu; x++)
839 greg 1.8 if (zscan(y)[x] <= 0) { /* empty pixel */
840 greg 1.7 /*
841     * First, find background from above or below.
842     * (farthest assigned pixel)
843     */
844 greg 1.4 if (yback[x] == -2) {
845 greg 1.17 for (i = y+1; i < vresolu; i++)
846 greg 1.8 if (zscan(i)[x] > 0)
847 greg 1.4 break;
848 greg 1.17 if (i < vresolu
849 greg 1.2 && (y <= 0 || zscan(y-1)[x] < zscan(i)[x]))
850 greg 1.4 yback[x] = i;
851     else
852     yback[x] = y-1;
853 greg 1.2 }
854 greg 1.7 /*
855     * Next, find background from left or right.
856     */
857 greg 1.4 if (xback == -2) {
858 greg 1.17 for (i = x+1; i < hresolu; i++)
859 greg 1.8 if (zscan(y)[i] > 0)
860 greg 1.4 break;
861 greg 1.17 if (i < hresolu
862 greg 1.4 && (x <= 0 || zscan(y)[x-1] < zscan(y)[i]))
863     xback = i;
864     else
865     xback = x-1;
866     }
867 greg 1.7 /*
868 greg 1.26 * If we have no background for this pixel,
869     * use the given fill function.
870 greg 1.11 */
871 greg 1.27 if (xback < 0 && yback[x] < 0)
872     goto fillit;
873 greg 1.11 /*
874 greg 1.7 * Compare, and use the background that is
875     * farther, unless one of them is next to us.
876 greg 1.27 * If the background is too distant, call
877     * the fill function.
878 greg 1.7 */
879 greg 1.11 if ( yback[x] < 0
880     || (xback >= 0 && ABS(x-xback) <= 1)
881 greg 1.4 || ( ABS(y-yback[x]) > 1
882 greg 1.11 && zscan(yback[x])[x]
883 greg 1.13 < zscan(y)[xback] ) ) {
884 greg 1.27 if (samp > 0 && ABS(x-xback) >= samp)
885     goto fillit;
886 greg 2.19 if (averaging) {
887     copycolor(sscan(y)[x],
888     sscan(y)[xback]);
889     wscan(y)[x] = wscan(y)[xback];
890     } else
891     copycolr(pscan(y)[x],
892     pscan(y)[xback]);
893 greg 1.13 zscan(y)[x] = zscan(y)[xback];
894     } else {
895 greg 1.27 if (samp > 0 && ABS(y-yback[x]) > samp)
896     goto fillit;
897 greg 2.19 if (averaging) {
898     copycolor(sscan(y)[x],
899     sscan(yback[x])[x]);
900     wscan(y)[x] =
901     wscan(yback[x])[x];
902     } else
903     copycolr(pscan(y)[x],
904     pscan(yback[x])[x]);
905 greg 1.13 zscan(y)[x] = zscan(yback[x])[x];
906 greg 1.27 }
907     continue;
908     fillit:
909     (*fill)(x,y);
910     if (fill == rcalfill) { /* use it */
911     clearqueue();
912     xback = x;
913     yback[x] = y;
914 greg 1.13 }
915 greg 1.4 } else { /* full pixel */
916     yback[x] = -2;
917     xback = -2;
918     }
919     }
920 greg 1.2 free((char *)yback);
921 greg 1.1 }
922    
923    
924 greg 1.25 fillpicture(fill) /* paint in empty pixels using fill */
925     int (*fill)();
926 greg 1.11 {
927     register int x, y;
928    
929 greg 1.17 for (y = 0; y < vresolu; y++)
930     for (x = 0; x < hresolu; x++)
931 greg 1.11 if (zscan(y)[x] <= 0)
932 greg 1.25 (*fill)(x,y);
933 greg 2.26 if (fill == rcalfill)
934     clearqueue();
935 greg 2.15 }
936    
937    
938     clipaft() /* perform aft clipping as indicated */
939     {
940     register int x, y;
941 greg 2.22 int adjtest = ourview.type == VT_PER & zisnorm;
942 greg 2.15 double tstdist;
943     double yzn2, vx;
944    
945     if (ourview.vaft <= FTINY)
946 greg 2.24 return(0);
947 greg 2.17 tstdist = ourview.vaft - ourview.vfore;
948 greg 2.15 for (y = 0; y < vresolu; y++) {
949 greg 2.22 if (adjtest) { /* adjust test */
950 greg 2.15 yzn2 = (y+.5)/vresolu + ourview.voff - .5;
951     yzn2 = 1. + yzn2*yzn2*ourview.vn2;
952 greg 2.17 tstdist = (ourview.vaft - ourview.vfore)*sqrt(yzn2);
953 greg 2.15 }
954     for (x = 0; x < hresolu; x++)
955     if (zscan(y)[x] > tstdist) {
956 greg 2.22 if (adjtest) {
957 greg 2.15 vx = (x+.5)/hresolu + ourview.hoff - .5;
958 greg 2.17 if (zscan(y)[x] <= (ourview.vaft -
959     ourview.vfore) *
960 greg 2.15 sqrt(vx*vx*ourview.hn2 + yzn2))
961     continue;
962     }
963 greg 2.19 if (averaging)
964     bzero(sscan(y)[x], sizeof(COLOR));
965     else
966     bzero(pscan(y)[x], sizeof(COLR));
967 greg 2.15 zscan(y)[x] = 0.0;
968     }
969     }
970 greg 2.24 return(1);
971 greg 1.11 }
972    
973    
974 greg 2.24 addblur() /* add to blurred picture */
975     {
976     COLOR cval;
977     double d;
978     register int i;
979    
980     if (!blurring)
981     return(0);
982     i = hresolu*vresolu;
983     if (nvavg < 2)
984     if (averaging)
985     while (i--) {
986     copycolor(ourbpict[i], ourspict[i]);
987     d = 1.0/ourweigh[i];
988     scalecolor(ourbpict[i], d);
989     }
990     else
991     while (i--)
992     colr_color(ourbpict[i], ourpict[i]);
993     else
994     if (averaging)
995     while (i--) {
996     copycolor(cval, ourspict[i]);
997     d = 1.0/ourweigh[i];
998     scalecolor(cval, d);
999     addcolor(ourbpict[i], cval);
1000     }
1001     else
1002     while (i--) {
1003     colr_color(cval, ourpict[i]);
1004     addcolor(ourbpict[i], cval);
1005     }
1006     /* print view */
1007     printf("VIEW%d:", nvavg);
1008     fprintview(&ourview, stdout);
1009     putchar('\n');
1010     return(1);
1011     }
1012    
1013    
1014 greg 2.21 writepicture() /* write out picture (alters buffer) */
1015 greg 1.1 {
1016     int y;
1017 greg 2.19 register int x;
1018     double d;
1019 greg 1.1
1020 greg 1.34 fprtresolu(hresolu, vresolu, stdout);
1021 greg 1.17 for (y = vresolu-1; y >= 0; y--)
1022 greg 2.24 if (blurring) {
1023     for (x = 0; x < hresolu; x++) { /* compute avg. */
1024     d = rexpadj/nvavg;
1025     scalecolor(bscan(y)[x], d);
1026     }
1027     if (fwritescan(bscan(y), hresolu, stdout) < 0)
1028     syserror(progname);
1029     } else if (averaging) {
1030 greg 2.19 for (x = 0; x < hresolu; x++) { /* average pixels */
1031 greg 2.21 d = rexpadj/wscan(y)[x];
1032 greg 2.19 scalecolor(sscan(y)[x], d);
1033     }
1034     if (fwritescan(sscan(y), hresolu, stdout) < 0)
1035     syserror(progname);
1036 greg 2.21 } else {
1037     if (expadj)
1038     shiftcolrs(pscan(y), hresolu, expadj);
1039     if (fwritecolrs(pscan(y), hresolu, stdout) < 0)
1040     syserror(progname);
1041     }
1042 greg 1.11 }
1043    
1044    
1045 greg 2.22 writedistance(fname) /* write out z file (alters buffer) */
1046 greg 1.11 char *fname;
1047     {
1048 greg 2.22 int donorm = normdist & !zisnorm ? 1 :
1049     ourview.type == VT_PER & !normdist & zisnorm ? -1 : 0;
1050 greg 1.19 int fd;
1051 greg 1.11 int y;
1052    
1053 greg 2.10 if ((fd = open(fname, O_WRONLY|O_CREAT|O_TRUNC, 0666)) == -1)
1054     syserror(fname);
1055 greg 1.17 for (y = vresolu-1; y >= 0; y--) {
1056 greg 1.11 if (donorm) {
1057 greg 2.22 double vx, yzn2, d;
1058 greg 1.11 register int x;
1059 greg 1.29 yzn2 = (y+.5)/vresolu + ourview.voff - .5;
1060 greg 1.17 yzn2 = 1. + yzn2*yzn2*ourview.vn2;
1061     for (x = 0; x < hresolu; x++) {
1062 greg 1.29 vx = (x+.5)/hresolu + ourview.hoff - .5;
1063 greg 2.22 d = sqrt(vx*vx*ourview.hn2 + yzn2);
1064     if (donorm > 0)
1065     zscan(y)[x] *= d;
1066     else
1067     zscan(y)[x] /= d;
1068 greg 1.11 }
1069 greg 2.22 }
1070     if (write(fd, (char *)zscan(y), hresolu*sizeof(float))
1071 greg 2.10 < hresolu*sizeof(float))
1072     syserror(fname);
1073 greg 1.11 }
1074 greg 1.19 close(fd);
1075 greg 1.10 }
1076    
1077    
1078 greg 1.12 backfill(x, y) /* fill pixel with background */
1079     int x, y;
1080     {
1081 greg 2.19 if (averaging) {
1082     copycolor(sscan(y)[x], backcolor);
1083     wscan(y)[x] = 1;
1084     } else
1085     copycolr(pscan(y)[x], backcolr);
1086 greg 1.13 zscan(y)[x] = backz;
1087     }
1088    
1089    
1090 greg 2.3 calstart(prog, args) /* start fill calculation */
1091 greg 1.13 char *prog, *args;
1092     {
1093     char combuf[512];
1094 greg 2.3 char *argv[64];
1095     int rval;
1096     register char **wp, *cp;
1097 greg 1.13
1098 greg 1.14 if (childpid != -1) {
1099     fprintf(stderr, "%s: too many calculations\n", progname);
1100     exit(1);
1101     }
1102 greg 2.3 strcpy(combuf, prog);
1103     strcat(combuf, args);
1104     cp = combuf;
1105     wp = argv;
1106     for ( ; ; ) {
1107 greg 2.11 while (isspace(*cp)) /* nullify spaces */
1108     *cp++ = '\0';
1109     if (!*cp) /* all done? */
1110     break;
1111     *wp++ = cp; /* add argument to list */
1112     while (*++cp && !isspace(*cp))
1113     ;
1114 greg 2.3 }
1115     *wp = NULL;
1116     /* start process */
1117     if ((rval = open_process(PDesc, argv)) < 0)
1118 greg 2.10 syserror(progname);
1119 greg 2.3 if (rval == 0) {
1120     fprintf(stderr, "%s: command not found\n", argv[0]);
1121     exit(1);
1122 greg 1.13 }
1123 greg 2.3 packsiz = rval/(6*sizeof(float)) - 1;
1124     if (packsiz > PACKSIZ)
1125     packsiz = PACKSIZ;
1126 greg 1.13 queuesiz = 0;
1127     }
1128    
1129    
1130 greg 2.3 caldone() /* done with calculation */
1131 greg 1.13 {
1132 greg 1.14 if (childpid == -1)
1133     return;
1134 greg 1.25 clearqueue();
1135 greg 2.3 close_process(PDesc);
1136 greg 1.14 childpid = -1;
1137 greg 1.13 }
1138    
1139    
1140 greg 1.14 rcalfill(x, y) /* fill with ray-calculated pixel */
1141 greg 1.13 int x, y;
1142     {
1143 greg 2.3 if (queuesiz >= packsiz) /* flush queue if needed */
1144 greg 1.25 clearqueue();
1145 greg 1.22 /* add position to queue */
1146 greg 1.13 queue[queuesiz][0] = x;
1147     queue[queuesiz][1] = y;
1148     queuesiz++;
1149     }
1150    
1151    
1152 greg 1.25 clearqueue() /* process queue */
1153 greg 1.13 {
1154 greg 1.22 FVECT orig, dir;
1155 greg 2.3 float fbuf[6*(PACKSIZ+1)];
1156     register float *fbp;
1157 greg 1.13 register int i;
1158 greg 2.22 double vx, vy;
1159 greg 1.13
1160 greg 2.10 if (queuesiz == 0)
1161     return;
1162 greg 2.3 fbp = fbuf;
1163 greg 1.13 for (i = 0; i < queuesiz; i++) {
1164 greg 1.22 viewray(orig, dir, &ourview,
1165     (queue[i][0]+.5)/hresolu,
1166     (queue[i][1]+.5)/vresolu);
1167 greg 2.3 *fbp++ = orig[0]; *fbp++ = orig[1]; *fbp++ = orig[2];
1168     *fbp++ = dir[0]; *fbp++ = dir[1]; *fbp++ = dir[2];
1169 greg 1.22 }
1170 greg 2.3 /* mark end and get results */
1171     bzero((char *)fbp, 6*sizeof(float));
1172     if (process(PDesc, fbuf, fbuf, 4*sizeof(float)*queuesiz,
1173     6*sizeof(float)*(queuesiz+1)) !=
1174     4*sizeof(float)*queuesiz) {
1175     fprintf(stderr, "%s: error reading from rtrace process\n",
1176     progname);
1177     exit(1);
1178     }
1179     fbp = fbuf;
1180 greg 1.22 for (i = 0; i < queuesiz; i++) {
1181 greg 1.16 if (ourexp > 0 && ourexp != 1.0) {
1182 greg 2.3 fbp[0] *= ourexp;
1183     fbp[1] *= ourexp;
1184     fbp[2] *= ourexp;
1185 greg 1.14 }
1186 greg 2.19 if (averaging) {
1187     setcolor(sscan(queue[i][1])[queue[i][0]],
1188     fbp[0], fbp[1], fbp[2]);
1189 greg 2.26 wscan(queue[i][1])[queue[i][0]] = 1;
1190 greg 2.19 } else
1191     setcolr(pscan(queue[i][1])[queue[i][0]],
1192     fbp[0], fbp[1], fbp[2]);
1193 greg 2.22 if (zisnorm)
1194     zscan(queue[i][1])[queue[i][0]] = fbp[3];
1195     else {
1196     vx = (queue[i][0]+.5)/hresolu + ourview.hoff - .5;
1197     vy = (queue[i][1]+.5)/vresolu + ourview.voff - .5;
1198     zscan(queue[i][1])[queue[i][0]] = fbp[3] / sqrt(1. +
1199     vx*vx*ourview.hn2 + vy*vy*ourview.vn2);
1200     }
1201 greg 2.3 fbp += 4;
1202 greg 1.13 }
1203     queuesiz = 0;
1204 greg 1.14 }
1205    
1206    
1207 greg 2.10 syserror(s) /* report error and exit */
1208     char *s;
1209 greg 1.14 {
1210 greg 2.10 perror(s);
1211 greg 1.14 exit(1);
1212 greg 1.1 }