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root/radiance/ray/src/px/pinterp.c
Revision: 2.40
Committed: Fri Jan 2 12:47:01 2004 UTC (20 years, 4 months ago) by schorsch
Content type: text/plain
Branch: MAIN
Changes since 2.39: +8 -4 lines
Log Message: 
Fixed typing/prototype of getheader() and its callback.

File Contents

# User Rev Content
1 greg 1.1 #ifndef lint
2 schorsch 2.40 static const char RCSid[] = "$Id: pinterp.c,v 2.39 2003/10/22 02:06:35 greg 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 greg 2.39 #include "platform.h"
16 schorsch 2.34 #include "standard.h"
17     #include "rtprocess.h" /* Windows: must come before color.h */
18 greg 1.1 #include "view.h"
19     #include "color.h"
20    
21 greg 2.21 #define LOG2 0.69314718055994530942
22    
23 greg 1.17 #define pscan(y) (ourpict+(y)*hresolu)
24 greg 2.19 #define sscan(y) (ourspict+(y)*hresolu)
25     #define wscan(y) (ourweigh+(y)*hresolu)
26 greg 1.17 #define zscan(y) (ourzbuf+(y)*hresolu)
27 greg 2.24 #define bscan(y) (ourbpict+(y)*hresolu)
28 greg 2.19 #define averaging (ourweigh != NULL)
29 greg 2.24 #define blurring (ourbpict != NULL)
30 greg 2.22 #define usematrix (hasmatrix & !averaging)
31 schorsch 2.37 #define zisnorm ((!usematrix) | (ourview.type != VT_PER))
32 greg 1.1
33 greg 2.20 #define MAXWT 1000. /* maximum pixel weight (averaging) */
34 greg 2.19
35 greg 1.13 #define F_FORE 1 /* fill foreground */
36     #define F_BACK 2 /* fill background */
37 greg 1.11
38 greg 2.3 #define PACKSIZ 256 /* max. calculation packet size */
39 greg 1.13
40 gregl 2.30 #define RTCOM "rtrace -h- -ovl -fff -ld- -i- -I- "
41 greg 1.13
42 greg 1.3 #define ABS(x) ((x)>0?(x):-(x))
43    
44 greg 1.15 struct position {int x,y; float z;};
45    
46 greg 2.16 #define NSTEPS 64 /* number steps in overlap prescan */
47     #define MINSTEP 4 /* minimum worthwhile preview step */
48    
49     struct bound {int min,max;};
50    
51 greg 1.17 VIEW ourview = STDVIEW; /* desired view */
52     int hresolu = 512; /* horizontal resolution */
53     int vresolu = 512; /* vertical resolution */
54 greg 1.18 double pixaspect = 1.0; /* pixel aspect ratio */
55 greg 1.1
56 greg 1.8 double zeps = .02; /* allowed z epsilon */
57 greg 1.1
58 greg 2.19 COLR *ourpict; /* output picture (COLR's) */
59 greg 2.20 COLOR *ourspict; /* output pixel sums (averaging) */
60     float *ourweigh = NULL; /* output pixel weights (averaging) */
61 greg 1.1 float *ourzbuf; /* corresponding z-buffer */
62 greg 2.25 COLOR *ourbpict = NULL; /* blurred picture (view averaging) */
63 greg 1.1
64 greg 2.24 VIEW avgview; /* average view for -B option */
65     int nvavg; /* number of views averaged */
66    
67 greg 1.1 char *progname;
68    
69 greg 1.25 int fillo = F_FORE|F_BACK; /* selected fill options */
70 greg 1.26 int fillsamp = 0; /* sample separation (0 == inf) */
71 greg 1.14 extern int backfill(), rcalfill(); /* fill functions */
72 greg 1.25 int (*fillfunc)() = backfill; /* selected fill function */
73 greg 1.11 COLR backcolr = BLKCOLR; /* background color */
74 greg 2.19 COLOR backcolor = BLKCOLOR; /* background color (float) */
75 greg 1.13 double backz = 0.0; /* background z value */
76 greg 2.22 int normdist = 1; /* i/o normalized distance? */
77 greg 2.27 char ourfmt[LPICFMT+1] = PICFMT; /* original picture format */
78 greg 2.21 double ourexp = -1; /* original picture exposure */
79     int expadj = 0; /* exposure adjustment (f-stops) */
80     double rexpadj = 1; /* real exposure adjustment */
81 greg 1.11
82 greg 2.24 VIEW theirview; /* input view */
83 greg 1.16 int gotview; /* got input view? */
84 greg 1.33 int wrongformat = 0; /* input in another format? */
85 greg 1.34 RESOLU tresolu; /* input resolution */
86 greg 1.17 double theirexp; /* input picture exposure */
87 greg 2.19 MAT4 theirs2ours; /* transformation matrix */
88 greg 1.30 int hasmatrix = 0; /* has transformation matrix */
89 greg 1.1
90 schorsch 2.34 static SUBPROC PDesc = SP_INACTIVE; /* rtrace process descriptor */
91 greg 2.3 unsigned short queue[PACKSIZ][2]; /* pending pixels */
92     int packsiz; /* actual packet size */
93 greg 2.26 int queuesiz = 0; /* number of pixels pending */
94 greg 1.5
95 greg 2.19 extern double movepixel();
96 greg 1.13
97 schorsch 2.40 static gethfunc headline;
98    
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 2.33 gotvfile = viewfile(argv[++an], &ourview, NULL);
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 schorsch 2.36 if (expcomp != NULL) {
239 schorsch 2.37 if ((expcomp[0] == '+') | (expcomp[0] == '-')) {
240 greg 2.21 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 schorsch 2.36 }
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 schorsch 2.37 if ((ourspict == NULL) | (ourweigh == NULL))
266 greg 2.19 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 2.33 fputnow(stdout);
283 greg 2.24 /* run pictures */
284     do {
285 schorsch 2.35 memset((char *)ourzbuf, '\0', hresolu*vresolu*sizeof(float));
286 greg 2.24 for (i = an; i < argc; i += 2)
287     addpicture(argv[i], argv[i+1]);
288     if (fillo&F_BACK) /* fill in spaces */
289     backpicture(fillfunc, fillsamp);
290     else
291     fillpicture(fillfunc);
292     /* aft clipping */
293     clipaft();
294     } while (addblur() && nextview(stdin) != EOF);
295 greg 1.13 /* close calculation */
296 greg 1.14 caldone();
297 greg 1.1 /* add to header */
298     printargs(argc, argv, stdout);
299 greg 2.24 compavgview();
300     if (doblur | gotvfile) {
301 greg 1.25 fputs(VIEWSTR, stdout);
302 greg 2.24 fprintview(&avgview, stdout);
303 greg 1.25 putc('\n', stdout);
304 greg 1.1 }
305 schorsch 2.37 if ((pixaspect < .99) | (pixaspect > 1.01))
306 greg 1.18 fputaspect(pixaspect, stdout);
307 greg 2.21 if (ourexp > 0)
308     ourexp *= rexpadj;
309     else
310     ourexp = rexpadj;
311 schorsch 2.37 if ((ourexp < .995) | (ourexp > 1.005))
312 greg 1.16 fputexpos(ourexp, stdout);
313 greg 2.27 if (strcmp(ourfmt, PICFMT)) /* print format if known */
314     fputformat(ourfmt, stdout);
315 greg 1.25 putc('\n', stdout);
316 greg 1.11 /* write picture */
317 greg 1.1 writepicture();
318 greg 1.11 /* write z file */
319     if (zfile != NULL)
320     writedistance(zfile);
321 greg 1.1
322     exit(0);
323 greg 1.10 userr:
324     fprintf(stderr,
325 greg 2.24 "Usage: %s [view opts][-t eps][-z zout][-e spec][-B][-a|-q][-fT][-n] pfile zspec ..\n",
326 greg 1.10 progname);
327     exit(1);
328 greg 1.1 #undef check
329     }
330    
331    
332 schorsch 2.40 static int
333     headline( /* process header string */
334     char *s,
335     void *p
336     )
337 greg 1.1 {
338 greg 1.33 char fmt[32];
339 greg 1.1
340 greg 2.13 if (isheadid(s))
341 gwlarson 2.31 return(0);
342 greg 2.13 if (formatval(fmt, s)) {
343 greg 2.27 if (globmatch(ourfmt, fmt)) {
344     wrongformat = 0;
345     strcpy(ourfmt, fmt);
346     } else
347     wrongformat = 1;
348 gwlarson 2.31 return(0);
349 greg 1.33 }
350 greg 2.24 if (nvavg < 2) {
351     putc('\t', stdout);
352     fputs(s, stdout);
353     }
354 greg 1.16 if (isexpos(s)) {
355     theirexp *= exposval(s);
356 gwlarson 2.31 return(0);
357 greg 1.16 }
358 greg 2.5 if (isview(s) && sscanview(&theirview, s) > 0)
359     gotview++;
360 gwlarson 2.31 return(0);
361 greg 1.1 }
362    
363    
364 greg 2.24 nextview(fp) /* get and set next view */
365     FILE *fp;
366     {
367     char linebuf[256];
368     char *err;
369     register int i;
370    
371     if (fp != NULL) {
372     do /* get new view */
373     if (fgets(linebuf, sizeof(linebuf), fp) == NULL)
374     return(EOF);
375     while (!isview(linebuf) || !sscanview(&ourview, linebuf));
376     }
377     /* set new view */
378     if ((err = setview(&ourview)) != NULL) {
379     fprintf(stderr, "%s: %s\n", progname, err);
380     exit(1);
381     }
382     if (!nvavg) { /* first view */
383 schorsch 2.36 avgview = ourview;
384 greg 2.24 return(nvavg++);
385     }
386     /* add to average view */
387     for (i = 0; i < 3; i++) {
388     avgview.vp[i] += ourview.vp[i];
389     avgview.vdir[i] += ourview.vdir[i];
390     avgview.vup[i] += ourview.vup[i];
391     }
392     avgview.horiz += ourview.horiz;
393     avgview.vert += ourview.vert;
394     avgview.hoff += ourview.hoff;
395     avgview.voff += ourview.voff;
396     avgview.vfore += ourview.vfore;
397     avgview.vaft += ourview.vaft;
398     return(nvavg++);
399     }
400    
401    
402     compavgview() /* compute average view */
403     {
404     register int i;
405     double f;
406    
407     if (nvavg < 2)
408     return;
409     f = 1.0/nvavg;
410     for (i = 0; i < 3; i++) {
411     avgview.vp[i] *= f;
412     avgview.vdir[i] *= f;
413     avgview.vup[i] *= f;
414     }
415     avgview.horiz *= f;
416     avgview.vert *= f;
417     avgview.hoff *= f;
418     avgview.voff *= f;
419     avgview.vfore *= f;
420     avgview.vaft *= f;
421     if (setview(&avgview) != NULL) /* in case of emergency... */
422 schorsch 2.36 avgview = ourview;
423 greg 2.24 pixaspect = viewaspect(&avgview) * hresolu / vresolu;
424     }
425    
426    
427 greg 1.10 addpicture(pfile, zspec) /* add picture to output */
428     char *pfile, *zspec;
429 greg 1.1 {
430 greg 1.19 FILE *pfp;
431     int zfd;
432 greg 1.8 char *err;
433 greg 1.1 COLR *scanin;
434 greg 1.15 float *zin;
435     struct position *plast;
436 greg 2.16 struct bound *xlim, ylim;
437 greg 1.1 int y;
438 greg 1.10 /* open picture file */
439 greg 2.10 if ((pfp = fopen(pfile, "r")) == NULL)
440     syserror(pfile);
441 greg 1.16 /* get header with exposure and view */
442     theirexp = 1.0;
443 schorsch 2.36 theirview = stdview;
444 greg 1.16 gotview = 0;
445 greg 2.24 if (nvavg < 2)
446     printf("%s:\n", pfile);
447 greg 1.33 getheader(pfp, headline, NULL);
448 greg 1.34 if (wrongformat || !gotview || !fgetsresolu(&tresolu, pfp)) {
449 greg 1.33 fprintf(stderr, "%s: picture format error\n", pfile);
450 greg 1.1 exit(1);
451     }
452 greg 1.16 if (ourexp <= 0)
453     ourexp = theirexp;
454     else if (ABS(theirexp-ourexp) > .01*ourexp)
455     fprintf(stderr, "%s: different exposure (warning)\n", pfile);
456 schorsch 2.37 if ( (err = setview(&theirview)) ) {
457 greg 1.1 fprintf(stderr, "%s: %s\n", pfile, err);
458     exit(1);
459     }
460 greg 1.5 /* compute transformation */
461 greg 1.30 hasmatrix = pixform(theirs2ours, &theirview, &ourview);
462 greg 2.16 /* get z specification or file */
463 greg 1.34 zin = (float *)malloc(scanlen(&tresolu)*sizeof(float));
464 greg 2.16 if (zin == NULL)
465 greg 2.10 syserror(progname);
466 greg 1.19 if ((zfd = open(zspec, O_RDONLY)) == -1) {
467 greg 1.10 double zvalue;
468     register int x;
469 greg 2.19 if (!isflt(zspec) || (zvalue = atof(zspec)) <= 0.0)
470 greg 2.10 syserror(zspec);
471 greg 1.34 for (x = scanlen(&tresolu); x-- > 0; )
472 greg 1.10 zin[x] = zvalue;
473     }
474 greg 2.16 /* compute transferrable perimeter */
475     xlim = (struct bound *)malloc(numscans(&tresolu)*sizeof(struct bound));
476     if (xlim == NULL)
477     syserror(progname);
478     if (!getperim(xlim, &ylim, zin, zfd)) { /* overlapping area? */
479 greg 2.33 free((void *)zin);
480     free((void *)xlim);
481 greg 2.16 if (zfd != -1)
482     close(zfd);
483     fclose(pfp);
484     return;
485     }
486     /* allocate scanlines */
487     scanin = (COLR *)malloc(scanlen(&tresolu)*sizeof(COLR));
488     plast = (struct position *)calloc(scanlen(&tresolu),
489     sizeof(struct position));
490 schorsch 2.37 if ((scanin == NULL) | (plast == NULL))
491 greg 2.16 syserror(progname);
492     /* skip to starting point */
493     for (y = 0; y < ylim.min; y++)
494     if (freadcolrs(scanin, scanlen(&tresolu), pfp) < 0) {
495     fprintf(stderr, "%s: read error\n", pfile);
496     exit(1);
497     }
498     if (zfd != -1 && lseek(zfd,
499 greg 2.38 (off_t)ylim.min*scanlen(&tresolu)*sizeof(float),
500     SEEK_SET) < 0)
501 greg 2.16 syserror(zspec);
502 greg 1.1 /* load image */
503 greg 2.16 for (y = ylim.min; y <= ylim.max; y++) {
504 greg 1.34 if (freadcolrs(scanin, scanlen(&tresolu), pfp) < 0) {
505 greg 1.1 fprintf(stderr, "%s: read error\n", pfile);
506     exit(1);
507     }
508 greg 2.16 if (zfd != -1 && read(zfd, (char *)zin,
509 greg 1.34 scanlen(&tresolu)*sizeof(float))
510 greg 2.16 < scanlen(&tresolu)*sizeof(float))
511     syserror(zspec);
512     addscanline(xlim+y, y, scanin, zin, plast);
513 greg 1.1 }
514     /* clean up */
515 greg 2.33 free((void *)xlim);
516     free((void *)scanin);
517     free((void *)zin);
518     free((void *)plast);
519 greg 1.1 fclose(pfp);
520 greg 1.19 if (zfd != -1)
521     close(zfd);
522 greg 1.1 }
523    
524    
525 greg 1.5 pixform(xfmat, vw1, vw2) /* compute view1 to view2 matrix */
526 greg 2.19 register MAT4 xfmat;
527 greg 1.5 register VIEW *vw1, *vw2;
528     {
529     double m4t[4][4];
530    
531 schorsch 2.37 if ((vw1->type != VT_PER) & (vw1->type != VT_PAR))
532 greg 1.30 return(0);
533 schorsch 2.37 if ((vw2->type != VT_PER) & (vw2->type != VT_PAR))
534 greg 1.30 return(0);
535 greg 1.5 setident4(xfmat);
536 greg 1.17 xfmat[0][0] = vw1->hvec[0];
537     xfmat[0][1] = vw1->hvec[1];
538     xfmat[0][2] = vw1->hvec[2];
539     xfmat[1][0] = vw1->vvec[0];
540     xfmat[1][1] = vw1->vvec[1];
541     xfmat[1][2] = vw1->vvec[2];
542 greg 1.5 xfmat[2][0] = vw1->vdir[0];
543     xfmat[2][1] = vw1->vdir[1];
544     xfmat[2][2] = vw1->vdir[2];
545     xfmat[3][0] = vw1->vp[0];
546     xfmat[3][1] = vw1->vp[1];
547     xfmat[3][2] = vw1->vp[2];
548     setident4(m4t);
549 greg 1.17 m4t[0][0] = vw2->hvec[0]/vw2->hn2;
550     m4t[1][0] = vw2->hvec[1]/vw2->hn2;
551     m4t[2][0] = vw2->hvec[2]/vw2->hn2;
552     m4t[3][0] = -DOT(vw2->vp,vw2->hvec)/vw2->hn2;
553     m4t[0][1] = vw2->vvec[0]/vw2->vn2;
554     m4t[1][1] = vw2->vvec[1]/vw2->vn2;
555     m4t[2][1] = vw2->vvec[2]/vw2->vn2;
556     m4t[3][1] = -DOT(vw2->vp,vw2->vvec)/vw2->vn2;
557 greg 1.5 m4t[0][2] = vw2->vdir[0];
558     m4t[1][2] = vw2->vdir[1];
559     m4t[2][2] = vw2->vdir[2];
560     m4t[3][2] = -DOT(vw2->vp,vw2->vdir);
561     multmat4(xfmat, xfmat, m4t);
562 greg 1.30 return(1);
563 greg 1.5 }
564    
565    
566 greg 2.16 addscanline(xl, y, pline, zline, lasty) /* add scanline to output */
567     struct bound *xl;
568 greg 1.1 int y;
569     COLR *pline;
570     float *zline;
571 greg 1.15 struct position *lasty; /* input/output */
572 greg 1.1 {
573 greg 1.30 FVECT pos;
574 greg 1.15 struct position lastx, newpos;
575 greg 2.19 double wt;
576 greg 1.1 register int x;
577    
578 greg 1.20 lastx.z = 0;
579 greg 2.16 for (x = xl->max; x >= xl->min; x--) {
580 greg 1.34 pix2loc(pos, &tresolu, x, y);
581 greg 1.5 pos[2] = zline[x];
582 greg 2.19 if ((wt = movepixel(pos)) <= FTINY) {
583 greg 1.15 lasty[x].z = lastx.z = 0; /* mark invalid */
584 greg 1.1 continue;
585 greg 1.15 }
586 greg 2.19 /* add pixel to our image */
587 greg 1.17 newpos.x = pos[0] * hresolu;
588     newpos.y = pos[1] * vresolu;
589 greg 1.15 newpos.z = zline[x];
590 greg 2.19 addpixel(&newpos, &lastx, &lasty[x], pline[x], wt, pos[2]);
591     lasty[x].x = lastx.x = newpos.x;
592     lasty[x].y = lastx.y = newpos.y;
593     lasty[x].z = lastx.z = newpos.z;
594 greg 1.1 }
595     }
596    
597    
598 greg 2.19 addpixel(p0, p1, p2, pix, w, z) /* fill in pixel parallelogram */
599 greg 1.15 struct position *p0, *p1, *p2;
600 greg 1.8 COLR pix;
601 greg 2.19 double w;
602 greg 1.8 double z;
603     {
604 greg 1.15 double zt = 2.*zeps*p0->z; /* threshold */
605 greg 2.19 COLOR pval; /* converted+weighted pixel */
606 greg 1.15 int s1x, s1y, s2x, s2y; /* step sizes */
607     int l1, l2, c1, c2; /* side lengths and counters */
608     int p1isy; /* p0p1 along y? */
609     int x1, y1; /* p1 position */
610     register int x, y; /* final position */
611    
612     /* compute vector p0p1 */
613 greg 1.25 if (fillo&F_FORE && ABS(p1->z-p0->z) <= zt) {
614 greg 1.15 s1x = p1->x - p0->x;
615     s1y = p1->y - p0->y;
616     l1 = ABS(s1x);
617 schorsch 2.37 if ( (p1isy = (ABS(s1y) > l1)) )
618 greg 1.15 l1 = ABS(s1y);
619 greg 2.20 else if (l1 < 1)
620 greg 2.19 l1 = 1;
621 greg 1.15 } else {
622     l1 = s1x = s1y = 1;
623     p1isy = -1;
624     }
625     /* compute vector p0p2 */
626 greg 1.25 if (fillo&F_FORE && ABS(p2->z-p0->z) <= zt) {
627 greg 1.15 s2x = p2->x - p0->x;
628     s2y = p2->y - p0->y;
629     if (p1isy == 1)
630     l2 = ABS(s2x);
631     else {
632     l2 = ABS(s2y);
633     if (p1isy != 0 && ABS(s2x) > l2)
634     l2 = ABS(s2x);
635     }
636 greg 2.19 if (l2 < 1)
637     l2 = 1;
638 greg 1.15 } else
639     l2 = s2x = s2y = 1;
640     /* fill the parallelogram */
641 greg 2.19 if (averaging) {
642     colr_color(pval, pix);
643     scalecolor(pval, w);
644     }
645 greg 1.15 for (c1 = l1; c1-- > 0; ) {
646     x1 = p0->x + c1*s1x/l1;
647     y1 = p0->y + c1*s1y/l1;
648     for (c2 = l2; c2-- > 0; ) {
649     x = x1 + c2*s2x/l2;
650 schorsch 2.37 if ((x < 0) | (x >= hresolu))
651 greg 1.28 continue;
652 greg 1.15 y = y1 + c2*s2y/l2;
653 schorsch 2.37 if ((y < 0) | (y >= vresolu))
654 greg 1.28 continue;
655 greg 2.19 if (averaging) {
656     if (zscan(y)[x] <= 0 || zscan(y)[x]-z
657 greg 1.15 > zeps*zscan(y)[x]) {
658 greg 2.19 copycolor(sscan(y)[x], pval);
659     wscan(y)[x] = w;
660     zscan(y)[x] = z;
661     } else if (z-zscan(y)[x] <= zeps*zscan(y)[x]) {
662     addcolor(sscan(y)[x], pval);
663     wscan(y)[x] += w;
664     }
665     } else if (zscan(y)[x] <= 0 || zscan(y)[x]-z
666     > zeps*zscan(y)[x]) {
667     copycolr(pscan(y)[x], pix);
668 greg 1.8 zscan(y)[x] = z;
669     }
670 greg 1.15 }
671     }
672 greg 2.16 }
673    
674    
675 greg 2.19 double
676 greg 2.18 movepixel(pos) /* reposition image point */
677 greg 2.20 register FVECT pos;
678 greg 2.18 {
679 greg 2.19 FVECT pt, tdir, odir;
680 greg 2.20 double d;
681 greg 2.18
682     if (pos[2] <= 0) /* empty pixel */
683 greg 2.19 return(0);
684 greg 2.22 if (usematrix) {
685 greg 2.18 pos[0] += theirview.hoff - .5;
686     pos[1] += theirview.voff - .5;
687 schorsch 2.37 if (normdist & (theirview.type == VT_PER))
688 greg 2.23 d = sqrt(1. + pos[0]*pos[0]*theirview.hn2
689     + pos[1]*pos[1]*theirview.vn2);
690     else
691     d = 1.;
692     pos[2] += d*theirview.vfore;
693 greg 2.18 if (theirview.type == VT_PER) {
694 greg 2.23 pos[2] /= d;
695 greg 2.18 pos[0] *= pos[2];
696     pos[1] *= pos[2];
697     }
698     multp3(pos, pos, theirs2ours);
699 greg 2.23 if (pos[2] <= ourview.vfore)
700 greg 2.19 return(0);
701 greg 2.18 if (ourview.type == VT_PER) {
702     pos[0] /= pos[2];
703     pos[1] /= pos[2];
704     }
705     pos[0] += .5 - ourview.hoff;
706     pos[1] += .5 - ourview.voff;
707 greg 2.23 pos[2] -= ourview.vfore;
708 greg 2.19 } else {
709     if (viewray(pt, tdir, &theirview, pos[0], pos[1]) < -FTINY)
710     return(0);
711 schorsch 2.37 if ((!normdist) & (theirview.type == VT_PER)) /* adjust */
712 greg 2.20 pos[2] *= sqrt(1. + pos[0]*pos[0]*theirview.hn2
713     + pos[1]*pos[1]*theirview.vn2);
714 greg 2.19 pt[0] += tdir[0]*pos[2];
715     pt[1] += tdir[1]*pos[2];
716     pt[2] += tdir[2]*pos[2];
717     viewloc(pos, &ourview, pt);
718     if (pos[2] <= 0)
719     return(0);
720     }
721 schorsch 2.37 if ((pos[0] < 0) | (pos[0] >= 1-FTINY) | (pos[1] < 0) | (pos[1] >= 1-FTINY))
722 greg 2.18 return(0);
723 greg 2.19 if (!averaging)
724     return(1);
725 gwlarson 2.32 /* compute pixel weight */
726     if (ourview.type == VT_PAR) {
727     d = DOT(ourview.vdir,tdir);
728     d = 1. - d*d;
729     } else {
730     VSUB(odir, pt, ourview.vp);
731     d = DOT(odir,tdir);
732     d = 1. - d*d/DOT(odir,odir);
733     }
734     if (d <= 1./MAXWT/MAXWT)
735 greg 2.19 return(MAXWT); /* clip to maximum weight */
736 gwlarson 2.32 return(1./sqrt(d));
737 greg 2.18 }
738    
739    
740 greg 2.16 getperim(xl, yl, zline, zfd) /* compute overlapping image area */
741     register struct bound *xl;
742     struct bound *yl;
743     float *zline;
744     int zfd;
745     {
746     int step;
747     FVECT pos;
748     register int x, y;
749     /* set up step size */
750     if (scanlen(&tresolu) < numscans(&tresolu))
751     step = scanlen(&tresolu)/NSTEPS;
752     else
753     step = numscans(&tresolu)/NSTEPS;
754     if (step < MINSTEP) { /* not worth cropping? */
755     yl->min = 0;
756     yl->max = numscans(&tresolu) - 1;
757     x = scanlen(&tresolu) - 1;
758     for (y = numscans(&tresolu); y--; ) {
759     xl[y].min = 0;
760     xl[y].max = x;
761     }
762     return(1);
763     }
764     yl->min = 32000; yl->max = 0; /* search for points on image */
765     for (y = step - 1; y < numscans(&tresolu); y += step) {
766     if (zfd != -1) {
767 greg 2.33 if (lseek(zfd, (off_t)y*scanlen(&tresolu)*sizeof(float),
768 greg 2.38 SEEK_SET) < 0)
769 greg 2.16 syserror("lseek");
770     if (read(zfd, (char *)zline,
771     scanlen(&tresolu)*sizeof(float))
772     < scanlen(&tresolu)*sizeof(float))
773     syserror("read");
774     }
775     xl[y].min = 32000; xl[y].max = 0; /* x max */
776     for (x = scanlen(&tresolu); (x -= step) > 0; ) {
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].max = x + step - 1;
781     xl[y].min = x - step + 1; /* x min */
782     if (xl[y].min < 0)
783     xl[y].min = 0;
784     for (x = step - 1; x < xl[y].max; x += step) {
785     pix2loc(pos, &tresolu, x, y);
786     pos[2] = zline[x];
787 greg 2.19 if (movepixel(pos) > FTINY) {
788 greg 2.16 xl[y].min = x - step + 1;
789     break;
790     }
791     }
792     if (y < yl->min) /* y limits */
793     yl->min = y - step + 1;
794     yl->max = y + step - 1;
795     break;
796     }
797     }
798     /* fill in between */
799 greg 2.18 if (y < step) {
800 greg 2.16 xl[y-1].min = xl[y].min;
801     xl[y-1].max = xl[y].max;
802 greg 2.18 } else {
803     if (xl[y].min < xl[y-step].min)
804     xl[y-1].min = xl[y].min;
805     else
806     xl[y-1].min = xl[y-step].min;
807     if (xl[y].max > xl[y-step].max)
808     xl[y-1].max = xl[y].max;
809     else
810     xl[y-1].max = xl[y-step].max;
811     }
812 greg 2.16 for (x = 2; x < step; x++)
813 schorsch 2.36 *(xl+y-x) = *(xl+y-1);
814 greg 2.16 }
815     if (yl->max >= numscans(&tresolu))
816     yl->max = numscans(&tresolu) - 1;
817 greg 2.20 y -= step;
818 greg 2.16 for (x = numscans(&tresolu) - 1; x > y; x--) /* fill bottom rows */
819 schorsch 2.36 *(xl+x) = *(xl+y);
820 greg 2.16 return(yl->max >= yl->min);
821 greg 1.8 }
822    
823    
824 greg 1.26 backpicture(fill, samp) /* background fill algorithm */
825 greg 1.25 int (*fill)();
826 greg 1.26 int samp;
827 greg 1.1 {
828 greg 1.2 int *yback, xback;
829 greg 1.1 int y;
830 greg 1.2 register int x, i;
831     /* get back buffer */
832 greg 1.17 yback = (int *)malloc(hresolu*sizeof(int));
833 greg 1.15 if (yback == NULL)
834 greg 2.10 syserror(progname);
835 greg 1.17 for (x = 0; x < hresolu; x++)
836 greg 1.4 yback[x] = -2;
837 greg 1.7 /*
838     * Xback and yback are the pixel locations of suitable
839     * background values in each direction.
840     * A value of -2 means unassigned, and -1 means
841     * that there is no suitable background in this direction.
842     */
843 greg 1.2 /* fill image */
844 greg 1.17 for (y = 0; y < vresolu; y++) {
845 greg 1.4 xback = -2;
846 greg 1.17 for (x = 0; x < hresolu; x++)
847 greg 1.8 if (zscan(y)[x] <= 0) { /* empty pixel */
848 greg 1.7 /*
849     * First, find background from above or below.
850     * (farthest assigned pixel)
851     */
852 greg 1.4 if (yback[x] == -2) {
853 greg 1.17 for (i = y+1; i < vresolu; i++)
854 greg 1.8 if (zscan(i)[x] > 0)
855 greg 1.4 break;
856 greg 1.17 if (i < vresolu
857 greg 1.2 && (y <= 0 || zscan(y-1)[x] < zscan(i)[x]))
858 greg 1.4 yback[x] = i;
859     else
860     yback[x] = y-1;
861 greg 1.2 }
862 greg 1.7 /*
863     * Next, find background from left or right.
864     */
865 greg 1.4 if (xback == -2) {
866 greg 1.17 for (i = x+1; i < hresolu; i++)
867 greg 1.8 if (zscan(y)[i] > 0)
868 greg 1.4 break;
869 greg 1.17 if (i < hresolu
870 greg 1.4 && (x <= 0 || zscan(y)[x-1] < zscan(y)[i]))
871     xback = i;
872     else
873     xback = x-1;
874     }
875 greg 1.7 /*
876 greg 1.26 * If we have no background for this pixel,
877     * use the given fill function.
878 greg 1.11 */
879 greg 1.27 if (xback < 0 && yback[x] < 0)
880     goto fillit;
881 greg 1.11 /*
882 greg 1.7 * Compare, and use the background that is
883     * farther, unless one of them is next to us.
884 greg 1.27 * If the background is too distant, call
885     * the fill function.
886 greg 1.7 */
887 greg 1.11 if ( yback[x] < 0
888     || (xback >= 0 && ABS(x-xback) <= 1)
889 greg 1.4 || ( ABS(y-yback[x]) > 1
890 greg 1.11 && zscan(yback[x])[x]
891 greg 1.13 < zscan(y)[xback] ) ) {
892 greg 1.27 if (samp > 0 && ABS(x-xback) >= samp)
893     goto fillit;
894 greg 2.19 if (averaging) {
895     copycolor(sscan(y)[x],
896     sscan(y)[xback]);
897     wscan(y)[x] = wscan(y)[xback];
898     } else
899     copycolr(pscan(y)[x],
900     pscan(y)[xback]);
901 greg 1.13 zscan(y)[x] = zscan(y)[xback];
902     } else {
903 greg 1.27 if (samp > 0 && ABS(y-yback[x]) > samp)
904     goto fillit;
905 greg 2.19 if (averaging) {
906     copycolor(sscan(y)[x],
907     sscan(yback[x])[x]);
908     wscan(y)[x] =
909     wscan(yback[x])[x];
910     } else
911     copycolr(pscan(y)[x],
912     pscan(yback[x])[x]);
913 greg 1.13 zscan(y)[x] = zscan(yback[x])[x];
914 greg 1.27 }
915     continue;
916     fillit:
917     (*fill)(x,y);
918     if (fill == rcalfill) { /* use it */
919     clearqueue();
920     xback = x;
921     yback[x] = y;
922 greg 1.13 }
923 greg 1.4 } else { /* full pixel */
924     yback[x] = -2;
925     xback = -2;
926     }
927     }
928 greg 2.33 free((void *)yback);
929 greg 1.1 }
930    
931    
932 greg 1.25 fillpicture(fill) /* paint in empty pixels using fill */
933     int (*fill)();
934 greg 1.11 {
935     register int x, y;
936    
937 greg 1.17 for (y = 0; y < vresolu; y++)
938     for (x = 0; x < hresolu; x++)
939 greg 1.11 if (zscan(y)[x] <= 0)
940 greg 1.25 (*fill)(x,y);
941 greg 2.26 if (fill == rcalfill)
942     clearqueue();
943 greg 2.15 }
944    
945    
946     clipaft() /* perform aft clipping as indicated */
947     {
948     register int x, y;
949 schorsch 2.37 int adjtest = (ourview.type == VT_PER) & zisnorm;
950 greg 2.15 double tstdist;
951     double yzn2, vx;
952    
953     if (ourview.vaft <= FTINY)
954 greg 2.24 return(0);
955 greg 2.17 tstdist = ourview.vaft - ourview.vfore;
956 greg 2.15 for (y = 0; y < vresolu; y++) {
957 greg 2.22 if (adjtest) { /* adjust test */
958 greg 2.15 yzn2 = (y+.5)/vresolu + ourview.voff - .5;
959     yzn2 = 1. + yzn2*yzn2*ourview.vn2;
960 greg 2.17 tstdist = (ourview.vaft - ourview.vfore)*sqrt(yzn2);
961 greg 2.15 }
962     for (x = 0; x < hresolu; x++)
963     if (zscan(y)[x] > tstdist) {
964 greg 2.22 if (adjtest) {
965 greg 2.15 vx = (x+.5)/hresolu + ourview.hoff - .5;
966 greg 2.17 if (zscan(y)[x] <= (ourview.vaft -
967     ourview.vfore) *
968 greg 2.15 sqrt(vx*vx*ourview.hn2 + yzn2))
969     continue;
970     }
971 greg 2.19 if (averaging)
972 schorsch 2.35 memset(sscan(y)[x], '\0', sizeof(COLOR));
973 greg 2.19 else
974 schorsch 2.35 memset(pscan(y)[x], '\0', sizeof(COLR));
975 greg 2.15 zscan(y)[x] = 0.0;
976     }
977     }
978 greg 2.24 return(1);
979 greg 1.11 }
980    
981    
982 greg 2.24 addblur() /* add to blurred picture */
983     {
984     COLOR cval;
985     double d;
986     register int i;
987    
988     if (!blurring)
989     return(0);
990     i = hresolu*vresolu;
991     if (nvavg < 2)
992     if (averaging)
993     while (i--) {
994     copycolor(ourbpict[i], ourspict[i]);
995     d = 1.0/ourweigh[i];
996     scalecolor(ourbpict[i], d);
997     }
998     else
999     while (i--)
1000     colr_color(ourbpict[i], ourpict[i]);
1001     else
1002     if (averaging)
1003     while (i--) {
1004     copycolor(cval, ourspict[i]);
1005     d = 1.0/ourweigh[i];
1006     scalecolor(cval, d);
1007     addcolor(ourbpict[i], cval);
1008     }
1009     else
1010     while (i--) {
1011     colr_color(cval, ourpict[i]);
1012     addcolor(ourbpict[i], cval);
1013     }
1014     /* print view */
1015     printf("VIEW%d:", nvavg);
1016     fprintview(&ourview, stdout);
1017     putchar('\n');
1018     return(1);
1019     }
1020    
1021    
1022 greg 2.21 writepicture() /* write out picture (alters buffer) */
1023 greg 1.1 {
1024     int y;
1025 greg 2.19 register int x;
1026     double d;
1027 greg 1.1
1028 greg 1.34 fprtresolu(hresolu, vresolu, stdout);
1029 greg 1.17 for (y = vresolu-1; y >= 0; y--)
1030 greg 2.24 if (blurring) {
1031     for (x = 0; x < hresolu; x++) { /* compute avg. */
1032     d = rexpadj/nvavg;
1033     scalecolor(bscan(y)[x], d);
1034     }
1035     if (fwritescan(bscan(y), hresolu, stdout) < 0)
1036     syserror(progname);
1037     } else if (averaging) {
1038 greg 2.19 for (x = 0; x < hresolu; x++) { /* average pixels */
1039 greg 2.21 d = rexpadj/wscan(y)[x];
1040 greg 2.19 scalecolor(sscan(y)[x], d);
1041     }
1042     if (fwritescan(sscan(y), hresolu, stdout) < 0)
1043     syserror(progname);
1044 greg 2.21 } else {
1045     if (expadj)
1046     shiftcolrs(pscan(y), hresolu, expadj);
1047     if (fwritecolrs(pscan(y), hresolu, stdout) < 0)
1048     syserror(progname);
1049     }
1050 greg 1.11 }
1051    
1052    
1053 greg 2.22 writedistance(fname) /* write out z file (alters buffer) */
1054 greg 1.11 char *fname;
1055     {
1056 greg 2.22 int donorm = normdist & !zisnorm ? 1 :
1057 schorsch 2.37 (ourview.type == VT_PER) & !normdist & zisnorm ? -1 : 0;
1058 greg 1.19 int fd;
1059 greg 1.11 int y;
1060    
1061 greg 2.10 if ((fd = open(fname, O_WRONLY|O_CREAT|O_TRUNC, 0666)) == -1)
1062     syserror(fname);
1063 greg 1.17 for (y = vresolu-1; y >= 0; y--) {
1064 greg 1.11 if (donorm) {
1065 greg 2.22 double vx, yzn2, d;
1066 greg 1.11 register int x;
1067 greg 1.29 yzn2 = (y+.5)/vresolu + ourview.voff - .5;
1068 greg 1.17 yzn2 = 1. + yzn2*yzn2*ourview.vn2;
1069     for (x = 0; x < hresolu; x++) {
1070 greg 1.29 vx = (x+.5)/hresolu + ourview.hoff - .5;
1071 greg 2.22 d = sqrt(vx*vx*ourview.hn2 + yzn2);
1072     if (donorm > 0)
1073     zscan(y)[x] *= d;
1074     else
1075     zscan(y)[x] /= d;
1076 greg 1.11 }
1077 greg 2.22 }
1078     if (write(fd, (char *)zscan(y), hresolu*sizeof(float))
1079 greg 2.10 < hresolu*sizeof(float))
1080     syserror(fname);
1081 greg 1.11 }
1082 greg 1.19 close(fd);
1083 greg 1.10 }
1084    
1085    
1086 greg 1.12 backfill(x, y) /* fill pixel with background */
1087     int x, y;
1088     {
1089 greg 2.19 if (averaging) {
1090     copycolor(sscan(y)[x], backcolor);
1091     wscan(y)[x] = 1;
1092     } else
1093     copycolr(pscan(y)[x], backcolr);
1094 greg 1.13 zscan(y)[x] = backz;
1095     }
1096    
1097    
1098 greg 2.3 calstart(prog, args) /* start fill calculation */
1099 greg 1.13 char *prog, *args;
1100     {
1101     char combuf[512];
1102 greg 2.3 char *argv[64];
1103     int rval;
1104     register char **wp, *cp;
1105 greg 1.13
1106 schorsch 2.34 if (PDesc.running) {
1107 greg 1.14 fprintf(stderr, "%s: too many calculations\n", progname);
1108     exit(1);
1109     }
1110 greg 2.3 strcpy(combuf, prog);
1111     strcat(combuf, args);
1112     cp = combuf;
1113     wp = argv;
1114     for ( ; ; ) {
1115 greg 2.11 while (isspace(*cp)) /* nullify spaces */
1116     *cp++ = '\0';
1117     if (!*cp) /* all done? */
1118     break;
1119     *wp++ = cp; /* add argument to list */
1120     while (*++cp && !isspace(*cp))
1121     ;
1122 greg 2.3 }
1123     *wp = NULL;
1124     /* start process */
1125 schorsch 2.34 if ((rval = open_process(&PDesc, argv)) < 0)
1126 greg 2.10 syserror(progname);
1127 greg 2.3 if (rval == 0) {
1128     fprintf(stderr, "%s: command not found\n", argv[0]);
1129     exit(1);
1130 greg 1.13 }
1131 greg 2.3 packsiz = rval/(6*sizeof(float)) - 1;
1132     if (packsiz > PACKSIZ)
1133     packsiz = PACKSIZ;
1134 greg 1.13 queuesiz = 0;
1135     }
1136    
1137    
1138 greg 2.3 caldone() /* done with calculation */
1139 greg 1.13 {
1140 schorsch 2.34 if (!PDesc.running)
1141 greg 1.14 return;
1142 greg 1.25 clearqueue();
1143 schorsch 2.34 close_process(&PDesc);
1144 greg 1.13 }
1145    
1146    
1147 greg 1.14 rcalfill(x, y) /* fill with ray-calculated pixel */
1148 greg 1.13 int x, y;
1149     {
1150 greg 2.3 if (queuesiz >= packsiz) /* flush queue if needed */
1151 greg 1.25 clearqueue();
1152 greg 1.22 /* add position to queue */
1153 greg 1.13 queue[queuesiz][0] = x;
1154     queue[queuesiz][1] = y;
1155     queuesiz++;
1156     }
1157    
1158    
1159 greg 1.25 clearqueue() /* process queue */
1160 greg 1.13 {
1161 greg 1.22 FVECT orig, dir;
1162 greg 2.3 float fbuf[6*(PACKSIZ+1)];
1163     register float *fbp;
1164 greg 1.13 register int i;
1165 greg 2.22 double vx, vy;
1166 greg 1.13
1167 greg 2.10 if (queuesiz == 0)
1168     return;
1169 greg 2.3 fbp = fbuf;
1170 greg 1.13 for (i = 0; i < queuesiz; i++) {
1171 greg 1.22 viewray(orig, dir, &ourview,
1172     (queue[i][0]+.5)/hresolu,
1173     (queue[i][1]+.5)/vresolu);
1174 greg 2.3 *fbp++ = orig[0]; *fbp++ = orig[1]; *fbp++ = orig[2];
1175     *fbp++ = dir[0]; *fbp++ = dir[1]; *fbp++ = dir[2];
1176 greg 1.22 }
1177 greg 2.3 /* mark end and get results */
1178 schorsch 2.35 memset((char *)fbp, '\0', 6*sizeof(float));
1179 schorsch 2.34 if (process(&PDesc, (char *)fbuf, (char *)fbuf,
1180 greg 2.33 4*sizeof(float)*(queuesiz+1),
1181 greg 2.3 6*sizeof(float)*(queuesiz+1)) !=
1182 gregl 2.29 4*sizeof(float)*(queuesiz+1)) {
1183 greg 2.3 fprintf(stderr, "%s: error reading from rtrace process\n",
1184     progname);
1185     exit(1);
1186     }
1187     fbp = fbuf;
1188 greg 1.22 for (i = 0; i < queuesiz; i++) {
1189 greg 1.16 if (ourexp > 0 && ourexp != 1.0) {
1190 greg 2.3 fbp[0] *= ourexp;
1191     fbp[1] *= ourexp;
1192     fbp[2] *= ourexp;
1193 greg 1.14 }
1194 greg 2.19 if (averaging) {
1195     setcolor(sscan(queue[i][1])[queue[i][0]],
1196     fbp[0], fbp[1], fbp[2]);
1197 greg 2.26 wscan(queue[i][1])[queue[i][0]] = 1;
1198 greg 2.19 } else
1199     setcolr(pscan(queue[i][1])[queue[i][0]],
1200     fbp[0], fbp[1], fbp[2]);
1201 greg 2.22 if (zisnorm)
1202     zscan(queue[i][1])[queue[i][0]] = fbp[3];
1203     else {
1204     vx = (queue[i][0]+.5)/hresolu + ourview.hoff - .5;
1205     vy = (queue[i][1]+.5)/vresolu + ourview.voff - .5;
1206     zscan(queue[i][1])[queue[i][0]] = fbp[3] / sqrt(1. +
1207     vx*vx*ourview.hn2 + vy*vy*ourview.vn2);
1208     }
1209 greg 2.3 fbp += 4;
1210 greg 1.13 }
1211     queuesiz = 0;
1212 greg 1.14 }
1213    
1214    
1215 greg 2.10 syserror(s) /* report error and exit */
1216     char *s;
1217 greg 1.14 {
1218 greg 2.10 perror(s);
1219 greg 1.14 exit(1);
1220 greg 1.1 }