ViewVC Help
View File | Revision Log | Show Annotations | Download File | Root Listing
root/radiance/ray/src/px/pinterp.c
Revision: 2.35
Committed: Mon Jun 30 14:59:12 2003 UTC (20 years, 10 months ago) by schorsch
Content type: text/plain
Branch: MAIN
Changes since 2.34: +6 -5 lines
Log Message: 
Replaced most outdated BSD function calls with their posix equivalents, and cleaned up a few other platform dependencies.

File Contents

# User Rev Content
1 greg 1.1 #ifndef lint
2 schorsch 2.35 static const char RCSid[] = "$Id: pinterp.c,v 2.34 2003/06/26 00:58:10 schorsch Exp $";
3 greg 1.1 #endif
4     /*
5     * Interpolate and extrapolate pictures with different view parameters.
6     *
7     * Greg Ward 09Dec89
8     */
9    
10 schorsch 2.34 #include "copyright.h"
11 greg 1.1
12 greg 2.3 #include <ctype.h>
13 schorsch 2.35 #include <string.h>
14 greg 2.3
15 schorsch 2.34 #include "standard.h"
16     #include "rtprocess.h" /* Windows: must come before color.h */
17 greg 1.1 #include "view.h"
18     #include "color.h"
19    
20 greg 2.21 #define LOG2 0.69314718055994530942
21    
22 greg 1.17 #define pscan(y) (ourpict+(y)*hresolu)
23 greg 2.19 #define sscan(y) (ourspict+(y)*hresolu)
24     #define wscan(y) (ourweigh+(y)*hresolu)
25 greg 1.17 #define zscan(y) (ourzbuf+(y)*hresolu)
26 greg 2.24 #define bscan(y) (ourbpict+(y)*hresolu)
27 greg 2.19 #define averaging (ourweigh != NULL)
28 greg 2.24 #define blurring (ourbpict != NULL)
29 greg 2.22 #define usematrix (hasmatrix & !averaging)
30     #define zisnorm (!usematrix | ourview.type != VT_PER)
31 greg 1.1
32 greg 2.20 #define MAXWT 1000. /* maximum pixel weight (averaging) */
33 greg 2.19
34 greg 1.13 #define F_FORE 1 /* fill foreground */
35     #define F_BACK 2 /* fill background */
36 greg 1.11
37 greg 2.3 #define PACKSIZ 256 /* max. calculation packet size */
38 greg 1.13
39 gregl 2.30 #define RTCOM "rtrace -h- -ovl -fff -ld- -i- -I- "
40 greg 1.13
41 greg 1.3 #define ABS(x) ((x)>0?(x):-(x))
42    
43 greg 1.15 struct position {int x,y; float z;};
44    
45 greg 2.16 #define NSTEPS 64 /* number steps in overlap prescan */
46     #define MINSTEP 4 /* minimum worthwhile preview step */
47    
48     struct bound {int min,max;};
49    
50 greg 1.17 VIEW ourview = STDVIEW; /* desired view */
51     int hresolu = 512; /* horizontal resolution */
52     int vresolu = 512; /* vertical resolution */
53 greg 1.18 double pixaspect = 1.0; /* pixel aspect ratio */
54 greg 1.1
55 greg 1.8 double zeps = .02; /* allowed z epsilon */
56 greg 1.1
57 greg 2.19 COLR *ourpict; /* output picture (COLR's) */
58 greg 2.20 COLOR *ourspict; /* output pixel sums (averaging) */
59     float *ourweigh = NULL; /* output pixel weights (averaging) */
60 greg 1.1 float *ourzbuf; /* corresponding z-buffer */
61 greg 2.25 COLOR *ourbpict = NULL; /* blurred picture (view averaging) */
62 greg 1.1
63 greg 2.24 VIEW avgview; /* average view for -B option */
64     int nvavg; /* number of views averaged */
65    
66 greg 1.1 char *progname;
67    
68 greg 1.25 int fillo = F_FORE|F_BACK; /* selected fill options */
69 greg 1.26 int fillsamp = 0; /* sample separation (0 == inf) */
70 greg 1.14 extern int backfill(), rcalfill(); /* fill functions */
71 greg 1.25 int (*fillfunc)() = backfill; /* selected fill function */
72 greg 1.11 COLR backcolr = BLKCOLR; /* background color */
73 greg 2.19 COLOR backcolor = BLKCOLOR; /* background color (float) */
74 greg 1.13 double backz = 0.0; /* background z value */
75 greg 2.22 int normdist = 1; /* i/o normalized distance? */
76 greg 2.27 char ourfmt[LPICFMT+1] = PICFMT; /* original picture format */
77 greg 2.21 double ourexp = -1; /* original picture exposure */
78     int expadj = 0; /* exposure adjustment (f-stops) */
79     double rexpadj = 1; /* real exposure adjustment */
80 greg 1.11
81 greg 2.24 VIEW theirview; /* input view */
82 greg 1.16 int gotview; /* got input view? */
83 greg 1.33 int wrongformat = 0; /* input in another format? */
84 greg 1.34 RESOLU tresolu; /* input resolution */
85 greg 1.17 double theirexp; /* input picture exposure */
86 greg 2.19 MAT4 theirs2ours; /* transformation matrix */
87 greg 1.30 int hasmatrix = 0; /* has transformation matrix */
88 greg 1.1
89 schorsch 2.34 static SUBPROC PDesc = SP_INACTIVE; /* rtrace process descriptor */
90 greg 2.3 unsigned short queue[PACKSIZ][2]; /* pending pixels */
91     int packsiz; /* actual packet size */
92 greg 2.26 int queuesiz = 0; /* number of pixels pending */
93 greg 1.5
94 greg 2.19 extern double movepixel();
95 greg 1.13
96 greg 2.19
97 greg 1.1 main(argc, argv) /* interpolate pictures */
98     int argc;
99     char *argv[];
100     {
101 greg 2.24 #define check(ol,al) if (argv[an][ol] || \
102     badarg(argc-an-1,argv+an+1,al)) \
103 greg 2.3 goto badopt
104 greg 1.1 int gotvfile = 0;
105 greg 2.19 int doavg = -1;
106 greg 2.24 int doblur = 0;
107 greg 1.11 char *zfile = NULL;
108 greg 2.21 char *expcomp = NULL;
109 greg 2.24 int i, an, rval;
110 greg 1.1
111     progname = argv[0];
112    
113 greg 2.24 for (an = 1; an < argc && argv[an][0] == '-'; an++) {
114     rval = getviewopt(&ourview, argc-an, argv+an);
115 greg 1.17 if (rval >= 0) {
116 greg 2.24 an += rval;
117 greg 1.17 continue;
118     }
119 greg 2.24 switch (argv[an][1]) {
120 greg 2.21 case 'e': /* exposure */
121     check(2,"f");
122 greg 2.24 expcomp = argv[++an];
123 greg 2.21 break;
124 greg 1.1 case 't': /* threshold */
125 greg 2.3 check(2,"f");
126 greg 2.24 zeps = atof(argv[++an]);
127 greg 1.1 break;
128 greg 2.19 case 'a': /* average */
129     check(2,NULL);
130     doavg = 1;
131     break;
132 greg 2.24 case 'B': /* blur views */
133     check(2,NULL);
134     doblur = 1;
135     break;
136 greg 2.19 case 'q': /* quick (no avg.) */
137     check(2,NULL);
138     doavg = 0;
139     break;
140 greg 1.11 case 'n': /* dist. normalized? */
141 greg 2.3 check(2,NULL);
142 greg 1.11 normdist = !normdist;
143 greg 1.10 break;
144 greg 1.11 case 'f': /* fill type */
145 greg 2.24 switch (argv[an][2]) {
146 greg 1.11 case '0': /* none */
147 greg 2.3 check(3,NULL);
148 greg 1.25 fillo = 0;
149 greg 1.11 break;
150     case 'f': /* foreground */
151 greg 2.3 check(3,NULL);
152 greg 1.25 fillo = F_FORE;
153 greg 1.11 break;
154     case 'b': /* background */
155 greg 2.3 check(3,NULL);
156 greg 1.25 fillo = F_BACK;
157 greg 1.11 break;
158     case 'a': /* all */
159 greg 2.3 check(3,NULL);
160 greg 1.25 fillo = F_FORE|F_BACK;
161 greg 1.11 break;
162 greg 1.25 case 's': /* sample */
163 greg 2.3 check(3,"i");
164 greg 2.24 fillsamp = atoi(argv[++an]);
165 greg 1.25 break;
166 greg 1.11 case 'c': /* color */
167 greg 2.3 check(3,"fff");
168 greg 1.25 fillfunc = backfill;
169 greg 2.24 setcolor(backcolor, atof(argv[an+1]),
170     atof(argv[an+2]), atof(argv[an+3]));
171 greg 2.19 setcolr(backcolr, colval(backcolor,RED),
172     colval(backcolor,GRN),
173     colval(backcolor,BLU));
174 greg 2.24 an += 3;
175 greg 1.11 break;
176 greg 1.13 case 'z': /* z value */
177 greg 2.3 check(3,"f");
178 greg 1.25 fillfunc = backfill;
179 greg 2.24 backz = atof(argv[++an]);
180 greg 1.13 break;
181     case 'r': /* rtrace */
182 greg 2.3 check(3,"s");
183 greg 1.25 fillfunc = rcalfill;
184 greg 2.24 calstart(RTCOM, argv[++an]);
185 greg 1.13 break;
186 greg 1.11 default:
187     goto badopt;
188     }
189     break;
190     case 'z': /* z file */
191 greg 2.3 check(2,"s");
192 greg 2.24 zfile = argv[++an];
193 greg 1.11 break;
194 greg 1.6 case 'x': /* x resolution */
195 greg 2.3 check(2,"i");
196 greg 2.24 hresolu = atoi(argv[++an]);
197 greg 1.6 break;
198     case 'y': /* y resolution */
199 greg 2.3 check(2,"i");
200 greg 2.24 vresolu = atoi(argv[++an]);
201 greg 1.6 break;
202 greg 1.18 case 'p': /* pixel aspect */
203 greg 2.24 if (argv[an][2] != 'a')
204 greg 2.6 goto badopt;
205     check(3,"f");
206 greg 2.24 pixaspect = atof(argv[++an]);
207 greg 1.18 break;
208 greg 1.17 case 'v': /* view file */
209 greg 2.24 if (argv[an][2] != 'f')
210 greg 1.1 goto badopt;
211 greg 2.3 check(3,"s");
212 greg 2.33 gotvfile = viewfile(argv[++an], &ourview, NULL);
213 greg 2.10 if (gotvfile < 0)
214 greg 2.24 syserror(argv[an]);
215 greg 2.10 else if (gotvfile == 0) {
216 greg 1.17 fprintf(stderr, "%s: bad view file\n",
217 greg 2.24 argv[an]);
218 greg 1.17 exit(1);
219 greg 1.1 }
220     break;
221     default:
222     badopt:
223 greg 1.10 fprintf(stderr, "%s: command line error at '%s'\n",
224 greg 2.24 progname, argv[an]);
225 greg 1.10 goto userr;
226 greg 1.1 }
227 greg 1.17 }
228 greg 1.1 /* check arguments */
229 greg 2.24 if ((argc-an)%2)
230 greg 1.10 goto userr;
231 greg 2.3 if (fillsamp == 1)
232     fillo &= ~F_BACK;
233 greg 2.20 if (doavg < 0)
234 greg 2.24 doavg = (argc-an) > 2;
235 greg 2.21 if (expcomp != NULL)
236     if (expcomp[0] == '+' | expcomp[0] == '-') {
237     expadj = atof(expcomp) + (expcomp[0]=='+' ? .5 : -.5);
238 greg 2.24 if (doavg | doblur)
239 greg 2.21 rexpadj = pow(2.0, atof(expcomp));
240     else
241     rexpadj = pow(2.0, (double)expadj);
242     } else {
243     if (!isflt(expcomp))
244     goto userr;
245     rexpadj = atof(expcomp);
246     expadj = log(rexpadj)/LOG2 + (rexpadj>1 ? .5 : -.5);
247 greg 2.24 if (!(doavg | doblur))
248 greg 2.21 rexpadj = pow(2.0, (double)expadj);
249     }
250 greg 1.1 /* set view */
251 greg 2.28 if (nextview(doblur ? stdin : (FILE *)NULL) == EOF) {
252 greg 2.24 fprintf(stderr, "%s: no view on standard input!\n",
253     progname);
254 greg 1.1 exit(1);
255     }
256 greg 1.18 normaspect(viewaspect(&ourview), &pixaspect, &hresolu, &vresolu);
257 greg 1.1 /* allocate frame */
258 greg 2.19 if (doavg) {
259     ourspict = (COLOR *)bmalloc(hresolu*vresolu*sizeof(COLOR));
260     ourweigh = (float *)bmalloc(hresolu*vresolu*sizeof(float));
261     if (ourspict == NULL | ourweigh == NULL)
262     syserror(progname);
263     } else {
264     ourpict = (COLR *)bmalloc(hresolu*vresolu*sizeof(COLR));
265     if (ourpict == NULL)
266     syserror(progname);
267     }
268 greg 2.24 if (doblur) {
269     ourbpict = (COLOR *)bmalloc(hresolu*vresolu*sizeof(COLOR));
270     if (ourbpict == NULL)
271     syserror(progname);
272     }
273 greg 2.7 ourzbuf = (float *)bmalloc(hresolu*vresolu*sizeof(float));
274 greg 2.19 if (ourzbuf == NULL)
275 greg 2.10 syserror(progname);
276 greg 2.13 /* new header */
277     newheader("RADIANCE", stdout);
278 greg 2.33 fputnow(stdout);
279 greg 2.24 /* run pictures */
280     do {
281 schorsch 2.35 memset((char *)ourzbuf, '\0', hresolu*vresolu*sizeof(float));
282 greg 2.24 for (i = an; i < argc; i += 2)
283     addpicture(argv[i], argv[i+1]);
284     if (fillo&F_BACK) /* fill in spaces */
285     backpicture(fillfunc, fillsamp);
286     else
287     fillpicture(fillfunc);
288     /* aft clipping */
289     clipaft();
290     } while (addblur() && nextview(stdin) != EOF);
291 greg 1.13 /* close calculation */
292 greg 1.14 caldone();
293 greg 1.1 /* add to header */
294     printargs(argc, argv, stdout);
295 greg 2.24 compavgview();
296     if (doblur | gotvfile) {
297 greg 1.25 fputs(VIEWSTR, stdout);
298 greg 2.24 fprintview(&avgview, stdout);
299 greg 1.25 putc('\n', stdout);
300 greg 1.1 }
301 greg 2.21 if (pixaspect < .99 | pixaspect > 1.01)
302 greg 1.18 fputaspect(pixaspect, stdout);
303 greg 2.21 if (ourexp > 0)
304     ourexp *= rexpadj;
305     else
306     ourexp = rexpadj;
307     if (ourexp < .995 | ourexp > 1.005)
308 greg 1.16 fputexpos(ourexp, stdout);
309 greg 2.27 if (strcmp(ourfmt, PICFMT)) /* print format if known */
310     fputformat(ourfmt, stdout);
311 greg 1.25 putc('\n', stdout);
312 greg 1.11 /* write picture */
313 greg 1.1 writepicture();
314 greg 1.11 /* write z file */
315     if (zfile != NULL)
316     writedistance(zfile);
317 greg 1.1
318     exit(0);
319 greg 1.10 userr:
320     fprintf(stderr,
321 greg 2.24 "Usage: %s [view opts][-t eps][-z zout][-e spec][-B][-a|-q][-fT][-n] pfile zspec ..\n",
322 greg 1.10 progname);
323     exit(1);
324 greg 1.1 #undef check
325     }
326    
327    
328 gwlarson 2.31 int
329 greg 1.1 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 gwlarson 2.31 return(0);
336 greg 2.13 if (formatval(fmt, s)) {
337 greg 2.27 if (globmatch(ourfmt, fmt)) {
338     wrongformat = 0;
339     strcpy(ourfmt, fmt);
340     } else
341     wrongformat = 1;
342 gwlarson 2.31 return(0);
343 greg 1.33 }
344 greg 2.24 if (nvavg < 2) {
345     putc('\t', stdout);
346     fputs(s, stdout);
347     }
348 greg 1.16 if (isexpos(s)) {
349     theirexp *= exposval(s);
350 gwlarson 2.31 return(0);
351 greg 1.16 }
352 greg 2.5 if (isview(s) && sscanview(&theirview, s) > 0)
353     gotview++;
354 gwlarson 2.31 return(0);
355 greg 1.1 }
356    
357    
358 greg 2.24 nextview(fp) /* get and set next view */
359     FILE *fp;
360     {
361     char linebuf[256];
362     char *err;
363     register int i;
364    
365     if (fp != NULL) {
366     do /* get new view */
367     if (fgets(linebuf, sizeof(linebuf), fp) == NULL)
368     return(EOF);
369     while (!isview(linebuf) || !sscanview(&ourview, linebuf));
370     }
371     /* set new view */
372     if ((err = setview(&ourview)) != NULL) {
373     fprintf(stderr, "%s: %s\n", progname, err);
374     exit(1);
375     }
376     if (!nvavg) { /* first view */
377     copystruct(&avgview, &ourview);
378     return(nvavg++);
379     }
380     /* add to average view */
381     for (i = 0; i < 3; i++) {
382     avgview.vp[i] += ourview.vp[i];
383     avgview.vdir[i] += ourview.vdir[i];
384     avgview.vup[i] += ourview.vup[i];
385     }
386     avgview.horiz += ourview.horiz;
387     avgview.vert += ourview.vert;
388     avgview.hoff += ourview.hoff;
389     avgview.voff += ourview.voff;
390     avgview.vfore += ourview.vfore;
391     avgview.vaft += ourview.vaft;
392     return(nvavg++);
393     }
394    
395    
396     compavgview() /* compute average view */
397     {
398     register int i;
399     double f;
400    
401     if (nvavg < 2)
402     return;
403     f = 1.0/nvavg;
404     for (i = 0; i < 3; i++) {
405     avgview.vp[i] *= f;
406     avgview.vdir[i] *= f;
407     avgview.vup[i] *= f;
408     }
409     avgview.horiz *= f;
410     avgview.vert *= f;
411     avgview.hoff *= f;
412     avgview.voff *= f;
413     avgview.vfore *= f;
414     avgview.vaft *= f;
415     if (setview(&avgview) != NULL) /* in case of emergency... */
416     copystruct(&avgview, &ourview);
417     pixaspect = viewaspect(&avgview) * hresolu / vresolu;
418     }
419    
420    
421 greg 1.10 addpicture(pfile, zspec) /* add picture to output */
422     char *pfile, *zspec;
423 greg 1.1 {
424 greg 1.19 FILE *pfp;
425     int zfd;
426 greg 1.8 char *err;
427 greg 1.1 COLR *scanin;
428 greg 1.15 float *zin;
429     struct position *plast;
430 greg 2.16 struct bound *xlim, ylim;
431 greg 1.1 int y;
432 greg 1.10 /* open picture file */
433 greg 2.10 if ((pfp = fopen(pfile, "r")) == NULL)
434     syserror(pfile);
435 greg 1.16 /* get header with exposure and view */
436     theirexp = 1.0;
437 greg 2.24 copystruct(&theirview, &stdview);
438 greg 1.16 gotview = 0;
439 greg 2.24 if (nvavg < 2)
440     printf("%s:\n", pfile);
441 greg 1.33 getheader(pfp, headline, NULL);
442 greg 1.34 if (wrongformat || !gotview || !fgetsresolu(&tresolu, pfp)) {
443 greg 1.33 fprintf(stderr, "%s: picture format error\n", pfile);
444 greg 1.1 exit(1);
445     }
446 greg 1.16 if (ourexp <= 0)
447     ourexp = theirexp;
448     else if (ABS(theirexp-ourexp) > .01*ourexp)
449     fprintf(stderr, "%s: different exposure (warning)\n", pfile);
450 greg 1.1 if (err = setview(&theirview)) {
451     fprintf(stderr, "%s: %s\n", pfile, err);
452     exit(1);
453     }
454 greg 1.5 /* compute transformation */
455 greg 1.30 hasmatrix = pixform(theirs2ours, &theirview, &ourview);
456 greg 2.16 /* get z specification or file */
457 greg 1.34 zin = (float *)malloc(scanlen(&tresolu)*sizeof(float));
458 greg 2.16 if (zin == NULL)
459 greg 2.10 syserror(progname);
460 greg 1.19 if ((zfd = open(zspec, O_RDONLY)) == -1) {
461 greg 1.10 double zvalue;
462     register int x;
463 greg 2.19 if (!isflt(zspec) || (zvalue = atof(zspec)) <= 0.0)
464 greg 2.10 syserror(zspec);
465 greg 1.34 for (x = scanlen(&tresolu); x-- > 0; )
466 greg 1.10 zin[x] = zvalue;
467     }
468 greg 2.16 /* compute transferrable perimeter */
469     xlim = (struct bound *)malloc(numscans(&tresolu)*sizeof(struct bound));
470     if (xlim == NULL)
471     syserror(progname);
472     if (!getperim(xlim, &ylim, zin, zfd)) { /* overlapping area? */
473 greg 2.33 free((void *)zin);
474     free((void *)xlim);
475 greg 2.16 if (zfd != -1)
476     close(zfd);
477     fclose(pfp);
478     return;
479     }
480     /* allocate scanlines */
481     scanin = (COLR *)malloc(scanlen(&tresolu)*sizeof(COLR));
482     plast = (struct position *)calloc(scanlen(&tresolu),
483     sizeof(struct position));
484     if (scanin == NULL | plast == NULL)
485     syserror(progname);
486     /* skip to starting point */
487     for (y = 0; y < ylim.min; y++)
488     if (freadcolrs(scanin, scanlen(&tresolu), pfp) < 0) {
489     fprintf(stderr, "%s: read error\n", pfile);
490     exit(1);
491     }
492     if (zfd != -1 && lseek(zfd,
493 greg 2.33 (off_t)ylim.min*scanlen(&tresolu)*sizeof(float), 0) < 0)
494 greg 2.16 syserror(zspec);
495 greg 1.1 /* load image */
496 greg 2.16 for (y = ylim.min; y <= ylim.max; y++) {
497 greg 1.34 if (freadcolrs(scanin, scanlen(&tresolu), pfp) < 0) {
498 greg 1.1 fprintf(stderr, "%s: read error\n", pfile);
499     exit(1);
500     }
501 greg 2.16 if (zfd != -1 && read(zfd, (char *)zin,
502 greg 1.34 scanlen(&tresolu)*sizeof(float))
503 greg 2.16 < scanlen(&tresolu)*sizeof(float))
504     syserror(zspec);
505     addscanline(xlim+y, y, scanin, zin, plast);
506 greg 1.1 }
507     /* clean up */
508 greg 2.33 free((void *)xlim);
509     free((void *)scanin);
510     free((void *)zin);
511     free((void *)plast);
512 greg 1.1 fclose(pfp);
513 greg 1.19 if (zfd != -1)
514     close(zfd);
515 greg 1.1 }
516    
517    
518 greg 1.5 pixform(xfmat, vw1, vw2) /* compute view1 to view2 matrix */
519 greg 2.19 register MAT4 xfmat;
520 greg 1.5 register VIEW *vw1, *vw2;
521     {
522     double m4t[4][4];
523    
524 greg 2.25 if (vw1->type != VT_PER & vw1->type != VT_PAR)
525 greg 1.30 return(0);
526 greg 2.25 if (vw2->type != VT_PER & vw2->type != VT_PAR)
527 greg 1.30 return(0);
528 greg 1.5 setident4(xfmat);
529 greg 1.17 xfmat[0][0] = vw1->hvec[0];
530     xfmat[0][1] = vw1->hvec[1];
531     xfmat[0][2] = vw1->hvec[2];
532     xfmat[1][0] = vw1->vvec[0];
533     xfmat[1][1] = vw1->vvec[1];
534     xfmat[1][2] = vw1->vvec[2];
535 greg 1.5 xfmat[2][0] = vw1->vdir[0];
536     xfmat[2][1] = vw1->vdir[1];
537     xfmat[2][2] = vw1->vdir[2];
538     xfmat[3][0] = vw1->vp[0];
539     xfmat[3][1] = vw1->vp[1];
540     xfmat[3][2] = vw1->vp[2];
541     setident4(m4t);
542 greg 1.17 m4t[0][0] = vw2->hvec[0]/vw2->hn2;
543     m4t[1][0] = vw2->hvec[1]/vw2->hn2;
544     m4t[2][0] = vw2->hvec[2]/vw2->hn2;
545     m4t[3][0] = -DOT(vw2->vp,vw2->hvec)/vw2->hn2;
546     m4t[0][1] = vw2->vvec[0]/vw2->vn2;
547     m4t[1][1] = vw2->vvec[1]/vw2->vn2;
548     m4t[2][1] = vw2->vvec[2]/vw2->vn2;
549     m4t[3][1] = -DOT(vw2->vp,vw2->vvec)/vw2->vn2;
550 greg 1.5 m4t[0][2] = vw2->vdir[0];
551     m4t[1][2] = vw2->vdir[1];
552     m4t[2][2] = vw2->vdir[2];
553     m4t[3][2] = -DOT(vw2->vp,vw2->vdir);
554     multmat4(xfmat, xfmat, m4t);
555 greg 1.30 return(1);
556 greg 1.5 }
557    
558    
559 greg 2.16 addscanline(xl, y, pline, zline, lasty) /* add scanline to output */
560     struct bound *xl;
561 greg 1.1 int y;
562     COLR *pline;
563     float *zline;
564 greg 1.15 struct position *lasty; /* input/output */
565 greg 1.1 {
566 greg 1.30 FVECT pos;
567 greg 1.15 struct position lastx, newpos;
568 greg 2.19 double wt;
569 greg 1.1 register int x;
570    
571 greg 1.20 lastx.z = 0;
572 greg 2.16 for (x = xl->max; x >= xl->min; x--) {
573 greg 1.34 pix2loc(pos, &tresolu, x, y);
574 greg 1.5 pos[2] = zline[x];
575 greg 2.19 if ((wt = movepixel(pos)) <= FTINY) {
576 greg 1.15 lasty[x].z = lastx.z = 0; /* mark invalid */
577 greg 1.1 continue;
578 greg 1.15 }
579 greg 2.19 /* add pixel to our image */
580 greg 1.17 newpos.x = pos[0] * hresolu;
581     newpos.y = pos[1] * vresolu;
582 greg 1.15 newpos.z = zline[x];
583 greg 2.19 addpixel(&newpos, &lastx, &lasty[x], pline[x], wt, pos[2]);
584     lasty[x].x = lastx.x = newpos.x;
585     lasty[x].y = lastx.y = newpos.y;
586     lasty[x].z = lastx.z = newpos.z;
587 greg 1.1 }
588     }
589    
590    
591 greg 2.19 addpixel(p0, p1, p2, pix, w, z) /* fill in pixel parallelogram */
592 greg 1.15 struct position *p0, *p1, *p2;
593 greg 1.8 COLR pix;
594 greg 2.19 double w;
595 greg 1.8 double z;
596     {
597 greg 1.15 double zt = 2.*zeps*p0->z; /* threshold */
598 greg 2.19 COLOR pval; /* converted+weighted pixel */
599 greg 1.15 int s1x, s1y, s2x, s2y; /* step sizes */
600     int l1, l2, c1, c2; /* side lengths and counters */
601     int p1isy; /* p0p1 along y? */
602     int x1, y1; /* p1 position */
603     register int x, y; /* final position */
604    
605     /* compute vector p0p1 */
606 greg 1.25 if (fillo&F_FORE && ABS(p1->z-p0->z) <= zt) {
607 greg 1.15 s1x = p1->x - p0->x;
608     s1y = p1->y - p0->y;
609     l1 = ABS(s1x);
610     if (p1isy = (ABS(s1y) > l1))
611     l1 = ABS(s1y);
612 greg 2.20 else if (l1 < 1)
613 greg 2.19 l1 = 1;
614 greg 1.15 } else {
615     l1 = s1x = s1y = 1;
616     p1isy = -1;
617     }
618     /* compute vector p0p2 */
619 greg 1.25 if (fillo&F_FORE && ABS(p2->z-p0->z) <= zt) {
620 greg 1.15 s2x = p2->x - p0->x;
621     s2y = p2->y - p0->y;
622     if (p1isy == 1)
623     l2 = ABS(s2x);
624     else {
625     l2 = ABS(s2y);
626     if (p1isy != 0 && ABS(s2x) > l2)
627     l2 = ABS(s2x);
628     }
629 greg 2.19 if (l2 < 1)
630     l2 = 1;
631 greg 1.15 } else
632     l2 = s2x = s2y = 1;
633     /* fill the parallelogram */
634 greg 2.19 if (averaging) {
635     colr_color(pval, pix);
636     scalecolor(pval, w);
637     }
638 greg 1.15 for (c1 = l1; c1-- > 0; ) {
639     x1 = p0->x + c1*s1x/l1;
640     y1 = p0->y + c1*s1y/l1;
641     for (c2 = l2; c2-- > 0; ) {
642     x = x1 + c2*s2x/l2;
643 greg 2.25 if (x < 0 | x >= hresolu)
644 greg 1.28 continue;
645 greg 1.15 y = y1 + c2*s2y/l2;
646 greg 2.25 if (y < 0 | y >= vresolu)
647 greg 1.28 continue;
648 greg 2.19 if (averaging) {
649     if (zscan(y)[x] <= 0 || zscan(y)[x]-z
650 greg 1.15 > zeps*zscan(y)[x]) {
651 greg 2.19 copycolor(sscan(y)[x], pval);
652     wscan(y)[x] = w;
653     zscan(y)[x] = z;
654     } else if (z-zscan(y)[x] <= zeps*zscan(y)[x]) {
655     addcolor(sscan(y)[x], pval);
656     wscan(y)[x] += w;
657     }
658     } else if (zscan(y)[x] <= 0 || zscan(y)[x]-z
659     > zeps*zscan(y)[x]) {
660     copycolr(pscan(y)[x], pix);
661 greg 1.8 zscan(y)[x] = z;
662     }
663 greg 1.15 }
664     }
665 greg 2.16 }
666    
667    
668 greg 2.19 double
669 greg 2.18 movepixel(pos) /* reposition image point */
670 greg 2.20 register FVECT pos;
671 greg 2.18 {
672 greg 2.19 FVECT pt, tdir, odir;
673 greg 2.20 double d;
674 greg 2.18
675     if (pos[2] <= 0) /* empty pixel */
676 greg 2.19 return(0);
677 greg 2.22 if (usematrix) {
678 greg 2.18 pos[0] += theirview.hoff - .5;
679     pos[1] += theirview.voff - .5;
680 greg 2.25 if (normdist & theirview.type == VT_PER)
681 greg 2.23 d = sqrt(1. + pos[0]*pos[0]*theirview.hn2
682     + pos[1]*pos[1]*theirview.vn2);
683     else
684     d = 1.;
685     pos[2] += d*theirview.vfore;
686 greg 2.18 if (theirview.type == VT_PER) {
687 greg 2.23 pos[2] /= d;
688 greg 2.18 pos[0] *= pos[2];
689     pos[1] *= pos[2];
690     }
691     multp3(pos, pos, theirs2ours);
692 greg 2.23 if (pos[2] <= ourview.vfore)
693 greg 2.19 return(0);
694 greg 2.18 if (ourview.type == VT_PER) {
695     pos[0] /= pos[2];
696     pos[1] /= pos[2];
697     }
698     pos[0] += .5 - ourview.hoff;
699     pos[1] += .5 - ourview.voff;
700 greg 2.23 pos[2] -= ourview.vfore;
701 greg 2.19 } else {
702     if (viewray(pt, tdir, &theirview, pos[0], pos[1]) < -FTINY)
703     return(0);
704 greg 2.22 if (!normdist & theirview.type == VT_PER) /* adjust */
705 greg 2.20 pos[2] *= sqrt(1. + pos[0]*pos[0]*theirview.hn2
706     + pos[1]*pos[1]*theirview.vn2);
707 greg 2.19 pt[0] += tdir[0]*pos[2];
708     pt[1] += tdir[1]*pos[2];
709     pt[2] += tdir[2]*pos[2];
710     viewloc(pos, &ourview, pt);
711     if (pos[2] <= 0)
712     return(0);
713     }
714 greg 2.25 if (pos[0] < 0 | pos[0] >= 1-FTINY | pos[1] < 0 | pos[1] >= 1-FTINY)
715 greg 2.18 return(0);
716 greg 2.19 if (!averaging)
717     return(1);
718 gwlarson 2.32 /* compute pixel weight */
719     if (ourview.type == VT_PAR) {
720     d = DOT(ourview.vdir,tdir);
721     d = 1. - d*d;
722     } else {
723     VSUB(odir, pt, ourview.vp);
724     d = DOT(odir,tdir);
725     d = 1. - d*d/DOT(odir,odir);
726     }
727     if (d <= 1./MAXWT/MAXWT)
728 greg 2.19 return(MAXWT); /* clip to maximum weight */
729 gwlarson 2.32 return(1./sqrt(d));
730 greg 2.18 }
731    
732    
733 greg 2.16 getperim(xl, yl, zline, zfd) /* compute overlapping image area */
734     register struct bound *xl;
735     struct bound *yl;
736     float *zline;
737     int zfd;
738     {
739     int step;
740     FVECT pos;
741     register int x, y;
742     /* set up step size */
743     if (scanlen(&tresolu) < numscans(&tresolu))
744     step = scanlen(&tresolu)/NSTEPS;
745     else
746     step = numscans(&tresolu)/NSTEPS;
747     if (step < MINSTEP) { /* not worth cropping? */
748     yl->min = 0;
749     yl->max = numscans(&tresolu) - 1;
750     x = scanlen(&tresolu) - 1;
751     for (y = numscans(&tresolu); y--; ) {
752     xl[y].min = 0;
753     xl[y].max = x;
754     }
755     return(1);
756     }
757     yl->min = 32000; yl->max = 0; /* search for points on image */
758     for (y = step - 1; y < numscans(&tresolu); y += step) {
759     if (zfd != -1) {
760 greg 2.33 if (lseek(zfd, (off_t)y*scanlen(&tresolu)*sizeof(float),
761 greg 2.16 0) < 0)
762     syserror("lseek");
763     if (read(zfd, (char *)zline,
764     scanlen(&tresolu)*sizeof(float))
765     < scanlen(&tresolu)*sizeof(float))
766     syserror("read");
767     }
768     xl[y].min = 32000; xl[y].max = 0; /* x max */
769     for (x = scanlen(&tresolu); (x -= step) > 0; ) {
770     pix2loc(pos, &tresolu, x, y);
771     pos[2] = zline[x];
772 greg 2.19 if (movepixel(pos) > FTINY) {
773 greg 2.16 xl[y].max = x + step - 1;
774     xl[y].min = x - step + 1; /* x min */
775     if (xl[y].min < 0)
776     xl[y].min = 0;
777     for (x = step - 1; x < xl[y].max; x += step) {
778     pix2loc(pos, &tresolu, x, y);
779     pos[2] = zline[x];
780 greg 2.19 if (movepixel(pos) > FTINY) {
781 greg 2.16 xl[y].min = x - step + 1;
782     break;
783     }
784     }
785     if (y < yl->min) /* y limits */
786     yl->min = y - step + 1;
787     yl->max = y + step - 1;
788     break;
789     }
790     }
791     /* fill in between */
792 greg 2.18 if (y < step) {
793 greg 2.16 xl[y-1].min = xl[y].min;
794     xl[y-1].max = xl[y].max;
795 greg 2.18 } else {
796     if (xl[y].min < xl[y-step].min)
797     xl[y-1].min = xl[y].min;
798     else
799     xl[y-1].min = xl[y-step].min;
800     if (xl[y].max > xl[y-step].max)
801     xl[y-1].max = xl[y].max;
802     else
803     xl[y-1].max = xl[y-step].max;
804     }
805 greg 2.16 for (x = 2; x < step; x++)
806     copystruct(xl+y-x, xl+y-1);
807     }
808     if (yl->max >= numscans(&tresolu))
809     yl->max = numscans(&tresolu) - 1;
810 greg 2.20 y -= step;
811 greg 2.16 for (x = numscans(&tresolu) - 1; x > y; x--) /* fill bottom rows */
812     copystruct(xl+x, xl+y);
813     return(yl->max >= yl->min);
814 greg 1.8 }
815    
816    
817 greg 1.26 backpicture(fill, samp) /* background fill algorithm */
818 greg 1.25 int (*fill)();
819 greg 1.26 int samp;
820 greg 1.1 {
821 greg 1.2 int *yback, xback;
822 greg 1.1 int y;
823 greg 1.2 register int x, i;
824     /* get back buffer */
825 greg 1.17 yback = (int *)malloc(hresolu*sizeof(int));
826 greg 1.15 if (yback == NULL)
827 greg 2.10 syserror(progname);
828 greg 1.17 for (x = 0; x < hresolu; x++)
829 greg 1.4 yback[x] = -2;
830 greg 1.7 /*
831     * Xback and yback are the pixel locations of suitable
832     * background values in each direction.
833     * A value of -2 means unassigned, and -1 means
834     * that there is no suitable background in this direction.
835     */
836 greg 1.2 /* fill image */
837 greg 1.17 for (y = 0; y < vresolu; y++) {
838 greg 1.4 xback = -2;
839 greg 1.17 for (x = 0; x < hresolu; x++)
840 greg 1.8 if (zscan(y)[x] <= 0) { /* empty pixel */
841 greg 1.7 /*
842     * First, find background from above or below.
843     * (farthest assigned pixel)
844     */
845 greg 1.4 if (yback[x] == -2) {
846 greg 1.17 for (i = y+1; i < vresolu; i++)
847 greg 1.8 if (zscan(i)[x] > 0)
848 greg 1.4 break;
849 greg 1.17 if (i < vresolu
850 greg 1.2 && (y <= 0 || zscan(y-1)[x] < zscan(i)[x]))
851 greg 1.4 yback[x] = i;
852     else
853     yback[x] = y-1;
854 greg 1.2 }
855 greg 1.7 /*
856     * Next, find background from left or right.
857     */
858 greg 1.4 if (xback == -2) {
859 greg 1.17 for (i = x+1; i < hresolu; i++)
860 greg 1.8 if (zscan(y)[i] > 0)
861 greg 1.4 break;
862 greg 1.17 if (i < hresolu
863 greg 1.4 && (x <= 0 || zscan(y)[x-1] < zscan(y)[i]))
864     xback = i;
865     else
866     xback = x-1;
867     }
868 greg 1.7 /*
869 greg 1.26 * If we have no background for this pixel,
870     * use the given fill function.
871 greg 1.11 */
872 greg 1.27 if (xback < 0 && yback[x] < 0)
873     goto fillit;
874 greg 1.11 /*
875 greg 1.7 * Compare, and use the background that is
876     * farther, unless one of them is next to us.
877 greg 1.27 * If the background is too distant, call
878     * the fill function.
879 greg 1.7 */
880 greg 1.11 if ( yback[x] < 0
881     || (xback >= 0 && ABS(x-xback) <= 1)
882 greg 1.4 || ( ABS(y-yback[x]) > 1
883 greg 1.11 && zscan(yback[x])[x]
884 greg 1.13 < zscan(y)[xback] ) ) {
885 greg 1.27 if (samp > 0 && ABS(x-xback) >= samp)
886     goto fillit;
887 greg 2.19 if (averaging) {
888     copycolor(sscan(y)[x],
889     sscan(y)[xback]);
890     wscan(y)[x] = wscan(y)[xback];
891     } else
892     copycolr(pscan(y)[x],
893     pscan(y)[xback]);
894 greg 1.13 zscan(y)[x] = zscan(y)[xback];
895     } else {
896 greg 1.27 if (samp > 0 && ABS(y-yback[x]) > samp)
897     goto fillit;
898 greg 2.19 if (averaging) {
899     copycolor(sscan(y)[x],
900     sscan(yback[x])[x]);
901     wscan(y)[x] =
902     wscan(yback[x])[x];
903     } else
904     copycolr(pscan(y)[x],
905     pscan(yback[x])[x]);
906 greg 1.13 zscan(y)[x] = zscan(yback[x])[x];
907 greg 1.27 }
908     continue;
909     fillit:
910     (*fill)(x,y);
911     if (fill == rcalfill) { /* use it */
912     clearqueue();
913     xback = x;
914     yback[x] = y;
915 greg 1.13 }
916 greg 1.4 } else { /* full pixel */
917     yback[x] = -2;
918     xback = -2;
919     }
920     }
921 greg 2.33 free((void *)yback);
922 greg 1.1 }
923    
924    
925 greg 1.25 fillpicture(fill) /* paint in empty pixels using fill */
926     int (*fill)();
927 greg 1.11 {
928     register int x, y;
929    
930 greg 1.17 for (y = 0; y < vresolu; y++)
931     for (x = 0; x < hresolu; x++)
932 greg 1.11 if (zscan(y)[x] <= 0)
933 greg 1.25 (*fill)(x,y);
934 greg 2.26 if (fill == rcalfill)
935     clearqueue();
936 greg 2.15 }
937    
938    
939     clipaft() /* perform aft clipping as indicated */
940     {
941     register int x, y;
942 greg 2.22 int adjtest = ourview.type == VT_PER & zisnorm;
943 greg 2.15 double tstdist;
944     double yzn2, vx;
945    
946     if (ourview.vaft <= FTINY)
947 greg 2.24 return(0);
948 greg 2.17 tstdist = ourview.vaft - ourview.vfore;
949 greg 2.15 for (y = 0; y < vresolu; y++) {
950 greg 2.22 if (adjtest) { /* adjust test */
951 greg 2.15 yzn2 = (y+.5)/vresolu + ourview.voff - .5;
952     yzn2 = 1. + yzn2*yzn2*ourview.vn2;
953 greg 2.17 tstdist = (ourview.vaft - ourview.vfore)*sqrt(yzn2);
954 greg 2.15 }
955     for (x = 0; x < hresolu; x++)
956     if (zscan(y)[x] > tstdist) {
957 greg 2.22 if (adjtest) {
958 greg 2.15 vx = (x+.5)/hresolu + ourview.hoff - .5;
959 greg 2.17 if (zscan(y)[x] <= (ourview.vaft -
960     ourview.vfore) *
961 greg 2.15 sqrt(vx*vx*ourview.hn2 + yzn2))
962     continue;
963     }
964 greg 2.19 if (averaging)
965 schorsch 2.35 memset(sscan(y)[x], '\0', sizeof(COLOR));
966 greg 2.19 else
967 schorsch 2.35 memset(pscan(y)[x], '\0', sizeof(COLR));
968 greg 2.15 zscan(y)[x] = 0.0;
969     }
970     }
971 greg 2.24 return(1);
972 greg 1.11 }
973    
974    
975 greg 2.24 addblur() /* add to blurred picture */
976     {
977     COLOR cval;
978     double d;
979     register int i;
980    
981     if (!blurring)
982     return(0);
983     i = hresolu*vresolu;
984     if (nvavg < 2)
985     if (averaging)
986     while (i--) {
987     copycolor(ourbpict[i], ourspict[i]);
988     d = 1.0/ourweigh[i];
989     scalecolor(ourbpict[i], d);
990     }
991     else
992     while (i--)
993     colr_color(ourbpict[i], ourpict[i]);
994     else
995     if (averaging)
996     while (i--) {
997     copycolor(cval, ourspict[i]);
998     d = 1.0/ourweigh[i];
999     scalecolor(cval, d);
1000     addcolor(ourbpict[i], cval);
1001     }
1002     else
1003     while (i--) {
1004     colr_color(cval, ourpict[i]);
1005     addcolor(ourbpict[i], cval);
1006     }
1007     /* print view */
1008     printf("VIEW%d:", nvavg);
1009     fprintview(&ourview, stdout);
1010     putchar('\n');
1011     return(1);
1012     }
1013    
1014    
1015 greg 2.21 writepicture() /* write out picture (alters buffer) */
1016 greg 1.1 {
1017     int y;
1018 greg 2.19 register int x;
1019     double d;
1020 greg 1.1
1021 greg 1.34 fprtresolu(hresolu, vresolu, stdout);
1022 greg 1.17 for (y = vresolu-1; y >= 0; y--)
1023 greg 2.24 if (blurring) {
1024     for (x = 0; x < hresolu; x++) { /* compute avg. */
1025     d = rexpadj/nvavg;
1026     scalecolor(bscan(y)[x], d);
1027     }
1028     if (fwritescan(bscan(y), hresolu, stdout) < 0)
1029     syserror(progname);
1030     } else if (averaging) {
1031 greg 2.19 for (x = 0; x < hresolu; x++) { /* average pixels */
1032 greg 2.21 d = rexpadj/wscan(y)[x];
1033 greg 2.19 scalecolor(sscan(y)[x], d);
1034     }
1035     if (fwritescan(sscan(y), hresolu, stdout) < 0)
1036     syserror(progname);
1037 greg 2.21 } else {
1038     if (expadj)
1039     shiftcolrs(pscan(y), hresolu, expadj);
1040     if (fwritecolrs(pscan(y), hresolu, stdout) < 0)
1041     syserror(progname);
1042     }
1043 greg 1.11 }
1044    
1045    
1046 greg 2.22 writedistance(fname) /* write out z file (alters buffer) */
1047 greg 1.11 char *fname;
1048     {
1049 greg 2.22 int donorm = normdist & !zisnorm ? 1 :
1050     ourview.type == VT_PER & !normdist & zisnorm ? -1 : 0;
1051 greg 1.19 int fd;
1052 greg 1.11 int y;
1053    
1054 greg 2.10 if ((fd = open(fname, O_WRONLY|O_CREAT|O_TRUNC, 0666)) == -1)
1055     syserror(fname);
1056 greg 1.17 for (y = vresolu-1; y >= 0; y--) {
1057 greg 1.11 if (donorm) {
1058 greg 2.22 double vx, yzn2, d;
1059 greg 1.11 register int x;
1060 greg 1.29 yzn2 = (y+.5)/vresolu + ourview.voff - .5;
1061 greg 1.17 yzn2 = 1. + yzn2*yzn2*ourview.vn2;
1062     for (x = 0; x < hresolu; x++) {
1063 greg 1.29 vx = (x+.5)/hresolu + ourview.hoff - .5;
1064 greg 2.22 d = sqrt(vx*vx*ourview.hn2 + yzn2);
1065     if (donorm > 0)
1066     zscan(y)[x] *= d;
1067     else
1068     zscan(y)[x] /= d;
1069 greg 1.11 }
1070 greg 2.22 }
1071     if (write(fd, (char *)zscan(y), hresolu*sizeof(float))
1072 greg 2.10 < hresolu*sizeof(float))
1073     syserror(fname);
1074 greg 1.11 }
1075 greg 1.19 close(fd);
1076 greg 1.10 }
1077    
1078    
1079 greg 1.12 backfill(x, y) /* fill pixel with background */
1080     int x, y;
1081     {
1082 greg 2.19 if (averaging) {
1083     copycolor(sscan(y)[x], backcolor);
1084     wscan(y)[x] = 1;
1085     } else
1086     copycolr(pscan(y)[x], backcolr);
1087 greg 1.13 zscan(y)[x] = backz;
1088     }
1089    
1090    
1091 greg 2.3 calstart(prog, args) /* start fill calculation */
1092 greg 1.13 char *prog, *args;
1093     {
1094     char combuf[512];
1095 greg 2.3 char *argv[64];
1096     int rval;
1097     register char **wp, *cp;
1098 greg 1.13
1099 schorsch 2.34 if (PDesc.running) {
1100 greg 1.14 fprintf(stderr, "%s: too many calculations\n", progname);
1101     exit(1);
1102     }
1103 greg 2.3 strcpy(combuf, prog);
1104     strcat(combuf, args);
1105     cp = combuf;
1106     wp = argv;
1107     for ( ; ; ) {
1108 greg 2.11 while (isspace(*cp)) /* nullify spaces */
1109     *cp++ = '\0';
1110     if (!*cp) /* all done? */
1111     break;
1112     *wp++ = cp; /* add argument to list */
1113     while (*++cp && !isspace(*cp))
1114     ;
1115 greg 2.3 }
1116     *wp = NULL;
1117     /* start process */
1118 schorsch 2.34 if ((rval = open_process(&PDesc, argv)) < 0)
1119 greg 2.10 syserror(progname);
1120 greg 2.3 if (rval == 0) {
1121     fprintf(stderr, "%s: command not found\n", argv[0]);
1122     exit(1);
1123 greg 1.13 }
1124 greg 2.3 packsiz = rval/(6*sizeof(float)) - 1;
1125     if (packsiz > PACKSIZ)
1126     packsiz = PACKSIZ;
1127 greg 1.13 queuesiz = 0;
1128     }
1129    
1130    
1131 greg 2.3 caldone() /* done with calculation */
1132 greg 1.13 {
1133 schorsch 2.34 if (!PDesc.running)
1134 greg 1.14 return;
1135 greg 1.25 clearqueue();
1136 schorsch 2.34 close_process(&PDesc);
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 schorsch 2.35 memset((char *)fbp, '\0', 6*sizeof(float));
1172 schorsch 2.34 if (process(&PDesc, (char *)fbuf, (char *)fbuf,
1173 greg 2.33 4*sizeof(float)*(queuesiz+1),
1174 greg 2.3 6*sizeof(float)*(queuesiz+1)) !=
1175 gregl 2.29 4*sizeof(float)*(queuesiz+1)) {
1176 greg 2.3 fprintf(stderr, "%s: error reading from rtrace process\n",
1177     progname);
1178     exit(1);
1179     }
1180     fbp = fbuf;
1181 greg 1.22 for (i = 0; i < queuesiz; i++) {
1182 greg 1.16 if (ourexp > 0 && ourexp != 1.0) {
1183 greg 2.3 fbp[0] *= ourexp;
1184     fbp[1] *= ourexp;
1185     fbp[2] *= ourexp;
1186 greg 1.14 }
1187 greg 2.19 if (averaging) {
1188     setcolor(sscan(queue[i][1])[queue[i][0]],
1189     fbp[0], fbp[1], fbp[2]);
1190 greg 2.26 wscan(queue[i][1])[queue[i][0]] = 1;
1191 greg 2.19 } else
1192     setcolr(pscan(queue[i][1])[queue[i][0]],
1193     fbp[0], fbp[1], fbp[2]);
1194 greg 2.22 if (zisnorm)
1195     zscan(queue[i][1])[queue[i][0]] = fbp[3];
1196     else {
1197     vx = (queue[i][0]+.5)/hresolu + ourview.hoff - .5;
1198     vy = (queue[i][1]+.5)/vresolu + ourview.voff - .5;
1199     zscan(queue[i][1])[queue[i][0]] = fbp[3] / sqrt(1. +
1200     vx*vx*ourview.hn2 + vy*vy*ourview.vn2);
1201     }
1202 greg 2.3 fbp += 4;
1203 greg 1.13 }
1204     queuesiz = 0;
1205 greg 1.14 }
1206    
1207    
1208 greg 2.10 syserror(s) /* report error and exit */
1209     char *s;
1210 greg 1.14 {
1211 greg 2.10 perror(s);
1212 greg 1.14 exit(1);
1213 greg 1.1 }