ViewVC Help
View File | Revision Log | Show Annotations | Download File | Root Listing
root/radiance/ray/src/px/pinterp.c
Revision: 2.50
Committed: Thu May 14 20:51:02 2020 UTC (4 years ago) by greg
Content type: text/plain
Branch: MAIN
CVS Tags: rad5R4, rad5R3
Changes since 2.49: +17 -11 lines
Log Message: 
Fixed issue with return value checking on viewloc() and open_float_depth()

File Contents

# User Rev Content
1 greg 1.1 #ifndef lint
2 greg 2.50 static const char RCSid[] = "$Id: pinterp.c,v 2.49 2020/02/28 05:18:49 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 greg 2.50 #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 1.11 COLR backcolr = BLKCOLR; /* background color */
72 greg 2.19 COLOR backcolor = BLKCOLOR; /* background color (float) */
73 greg 1.13 double backz = 0.0; /* background z value */
74 greg 2.22 int normdist = 1; /* i/o normalized distance? */
75 greg 2.27 char ourfmt[LPICFMT+1] = PICFMT; /* original picture format */
76 greg 2.21 double ourexp = -1; /* original picture exposure */
77     int expadj = 0; /* exposure adjustment (f-stops) */
78     double rexpadj = 1; /* real exposure adjustment */
79 greg 1.11
80 greg 2.24 VIEW theirview; /* input view */
81 greg 1.16 int gotview; /* got input view? */
82 greg 1.33 int wrongformat = 0; /* input in another format? */
83 greg 1.34 RESOLU tresolu; /* input resolution */
84 greg 1.17 double theirexp; /* input picture exposure */
85 greg 2.19 MAT4 theirs2ours; /* transformation matrix */
86 greg 1.30 int hasmatrix = 0; /* has transformation matrix */
87 greg 1.1
88 schorsch 2.34 static SUBPROC PDesc = SP_INACTIVE; /* rtrace process descriptor */
89 greg 2.3 unsigned short queue[PACKSIZ][2]; /* pending pixels */
90     int packsiz; /* actual packet size */
91 greg 2.26 int queuesiz = 0; /* number of pixels pending */
92 greg 1.5
93 schorsch 2.41 typedef void fillfunc_t(int x, int y);
94 greg 1.13
95 schorsch 2.40 static gethfunc headline;
96 schorsch 2.41 static int nextview(FILE *fp);
97     static void compavgview(void);
98     static void addpicture(char *pfile, char *zspec);
99     static int pixform(MAT4 xfmat, VIEW *vw1, VIEW *vw2);
100     static void addscanline(struct bound *xl, int y,
101     COLR *pline, float *zline, struct position *lasty);
102     static void addpixel(struct position *p0, struct position *p1,
103     struct position *p2, COLR pix, double w, double z);
104     static double movepixel(FVECT pos);
105     static int getperim(struct bound *xl, struct bound *yl, float *zline, int zfd);
106     static void backpicture(fillfunc_t *fill, int samp);
107     static void fillpicture(fillfunc_t *fill);
108     static int clipaft(void);
109     static int addblur(void);
110     static void writepicture(void);
111     static void writedistance(char *fname);
112     static fillfunc_t backfill;
113     static fillfunc_t rcalfill;
114     static void calstart(char *prog, char *args);
115     static void caldone(void);
116     static void clearqueue(void);
117     static void syserror(char *s);
118    
119     fillfunc_t *fillfunc = backfill; /* selected fill function */
120    
121     int
122     main( /* interpolate pictures */
123     int argc,
124     char *argv[]
125     )
126 greg 1.1 {
127 greg 2.24 #define check(ol,al) if (argv[an][ol] || \
128     badarg(argc-an-1,argv+an+1,al)) \
129 greg 2.3 goto badopt
130 greg 1.1 int gotvfile = 0;
131 greg 2.19 int doavg = -1;
132 greg 2.24 int doblur = 0;
133 greg 1.11 char *zfile = NULL;
134 greg 2.21 char *expcomp = NULL;
135 greg 2.24 int i, an, rval;
136 greg 1.1
137 greg 2.43 SET_DEFAULT_BINARY();
138     SET_FILE_BINARY(stdout);
139    
140 greg 1.1 progname = argv[0];
141    
142 greg 2.24 for (an = 1; an < argc && argv[an][0] == '-'; an++) {
143     rval = getviewopt(&ourview, argc-an, argv+an);
144 greg 1.17 if (rval >= 0) {
145 greg 2.24 an += rval;
146 greg 1.17 continue;
147     }
148 greg 2.24 switch (argv[an][1]) {
149 greg 2.21 case 'e': /* exposure */
150     check(2,"f");
151 greg 2.24 expcomp = argv[++an];
152 greg 2.21 break;
153 greg 1.1 case 't': /* threshold */
154 greg 2.3 check(2,"f");
155 greg 2.24 zeps = atof(argv[++an]);
156 greg 1.1 break;
157 greg 2.19 case 'a': /* average */
158     check(2,NULL);
159     doavg = 1;
160     break;
161 greg 2.24 case 'B': /* blur views */
162     check(2,NULL);
163     doblur = 1;
164     break;
165 greg 2.19 case 'q': /* quick (no avg.) */
166     check(2,NULL);
167     doavg = 0;
168     break;
169 greg 1.11 case 'n': /* dist. normalized? */
170 greg 2.3 check(2,NULL);
171 greg 1.11 normdist = !normdist;
172 greg 1.10 break;
173 greg 1.11 case 'f': /* fill type */
174 greg 2.24 switch (argv[an][2]) {
175 greg 1.11 case '0': /* none */
176 greg 2.3 check(3,NULL);
177 greg 1.25 fillo = 0;
178 greg 1.11 break;
179     case 'f': /* foreground */
180 greg 2.3 check(3,NULL);
181 greg 1.25 fillo = F_FORE;
182 greg 1.11 break;
183     case 'b': /* background */
184 greg 2.3 check(3,NULL);
185 greg 1.25 fillo = F_BACK;
186 greg 1.11 break;
187     case 'a': /* all */
188 greg 2.3 check(3,NULL);
189 greg 1.25 fillo = F_FORE|F_BACK;
190 greg 1.11 break;
191 greg 1.25 case 's': /* sample */
192 greg 2.3 check(3,"i");
193 greg 2.24 fillsamp = atoi(argv[++an]);
194 greg 1.25 break;
195 greg 1.11 case 'c': /* color */
196 greg 2.3 check(3,"fff");
197 greg 1.25 fillfunc = backfill;
198 greg 2.24 setcolor(backcolor, atof(argv[an+1]),
199     atof(argv[an+2]), atof(argv[an+3]));
200 greg 2.19 setcolr(backcolr, colval(backcolor,RED),
201     colval(backcolor,GRN),
202     colval(backcolor,BLU));
203 greg 2.24 an += 3;
204 greg 1.11 break;
205 greg 1.13 case 'z': /* z value */
206 greg 2.3 check(3,"f");
207 greg 1.25 fillfunc = backfill;
208 greg 2.24 backz = atof(argv[++an]);
209 greg 1.13 break;
210     case 'r': /* rtrace */
211 greg 2.3 check(3,"s");
212 greg 1.25 fillfunc = rcalfill;
213 greg 2.24 calstart(RTCOM, argv[++an]);
214 greg 1.13 break;
215 greg 1.11 default:
216     goto badopt;
217     }
218     break;
219     case 'z': /* z file */
220 greg 2.3 check(2,"s");
221 greg 2.24 zfile = argv[++an];
222 greg 1.11 break;
223 greg 1.6 case 'x': /* x resolution */
224 greg 2.3 check(2,"i");
225 greg 2.24 hresolu = atoi(argv[++an]);
226 greg 1.6 break;
227     case 'y': /* y resolution */
228 greg 2.3 check(2,"i");
229 greg 2.24 vresolu = atoi(argv[++an]);
230 greg 1.6 break;
231 greg 1.18 case 'p': /* pixel aspect */
232 greg 2.24 if (argv[an][2] != 'a')
233 greg 2.6 goto badopt;
234     check(3,"f");
235 greg 2.24 pixaspect = atof(argv[++an]);
236 greg 1.18 break;
237 greg 1.17 case 'v': /* view file */
238 greg 2.24 if (argv[an][2] != 'f')
239 greg 1.1 goto badopt;
240 greg 2.3 check(3,"s");
241 greg 2.33 gotvfile = viewfile(argv[++an], &ourview, NULL);
242 greg 2.10 if (gotvfile < 0)
243 greg 2.24 syserror(argv[an]);
244 greg 2.10 else if (gotvfile == 0) {
245 greg 1.17 fprintf(stderr, "%s: bad view file\n",
246 greg 2.24 argv[an]);
247 greg 1.17 exit(1);
248 greg 1.1 }
249     break;
250     default:
251     badopt:
252 greg 1.10 fprintf(stderr, "%s: command line error at '%s'\n",
253 greg 2.24 progname, argv[an]);
254 greg 1.10 goto userr;
255 greg 1.1 }
256 greg 1.17 }
257 greg 1.1 /* check arguments */
258 greg 2.24 if ((argc-an)%2)
259 greg 1.10 goto userr;
260 greg 2.3 if (fillsamp == 1)
261     fillo &= ~F_BACK;
262 greg 2.20 if (doavg < 0)
263 greg 2.24 doavg = (argc-an) > 2;
264 schorsch 2.36 if (expcomp != NULL) {
265 schorsch 2.37 if ((expcomp[0] == '+') | (expcomp[0] == '-')) {
266 greg 2.21 expadj = atof(expcomp) + (expcomp[0]=='+' ? .5 : -.5);
267 greg 2.24 if (doavg | doblur)
268 greg 2.21 rexpadj = pow(2.0, atof(expcomp));
269     else
270     rexpadj = pow(2.0, (double)expadj);
271     } else {
272     if (!isflt(expcomp))
273     goto userr;
274     rexpadj = atof(expcomp);
275     expadj = log(rexpadj)/LOG2 + (rexpadj>1 ? .5 : -.5);
276 greg 2.24 if (!(doavg | doblur))
277 greg 2.21 rexpadj = pow(2.0, (double)expadj);
278     }
279 schorsch 2.36 }
280 greg 1.1 /* set view */
281 greg 2.28 if (nextview(doblur ? stdin : (FILE *)NULL) == EOF) {
282 greg 2.24 fprintf(stderr, "%s: no view on standard input!\n",
283     progname);
284 greg 1.1 exit(1);
285     }
286 greg 1.18 normaspect(viewaspect(&ourview), &pixaspect, &hresolu, &vresolu);
287 greg 1.1 /* allocate frame */
288 greg 2.19 if (doavg) {
289     ourspict = (COLOR *)bmalloc(hresolu*vresolu*sizeof(COLOR));
290     ourweigh = (float *)bmalloc(hresolu*vresolu*sizeof(float));
291 schorsch 2.37 if ((ourspict == NULL) | (ourweigh == NULL))
292 greg 2.19 syserror(progname);
293     } else {
294     ourpict = (COLR *)bmalloc(hresolu*vresolu*sizeof(COLR));
295     if (ourpict == NULL)
296     syserror(progname);
297     }
298 greg 2.24 if (doblur) {
299     ourbpict = (COLOR *)bmalloc(hresolu*vresolu*sizeof(COLOR));
300     if (ourbpict == NULL)
301     syserror(progname);
302     }
303 greg 2.7 ourzbuf = (float *)bmalloc(hresolu*vresolu*sizeof(float));
304 greg 2.19 if (ourzbuf == NULL)
305 greg 2.10 syserror(progname);
306 greg 2.13 /* new header */
307     newheader("RADIANCE", stdout);
308 greg 2.33 fputnow(stdout);
309 greg 2.24 /* run pictures */
310     do {
311 schorsch 2.35 memset((char *)ourzbuf, '\0', hresolu*vresolu*sizeof(float));
312 greg 2.24 for (i = an; i < argc; i += 2)
313     addpicture(argv[i], argv[i+1]);
314     if (fillo&F_BACK) /* fill in spaces */
315     backpicture(fillfunc, fillsamp);
316     else
317     fillpicture(fillfunc);
318     /* aft clipping */
319     clipaft();
320     } while (addblur() && nextview(stdin) != EOF);
321 greg 1.13 /* close calculation */
322 greg 1.14 caldone();
323 greg 1.1 /* add to header */
324     printargs(argc, argv, stdout);
325 greg 2.24 compavgview();
326     if (doblur | gotvfile) {
327 greg 1.25 fputs(VIEWSTR, stdout);
328 greg 2.24 fprintview(&avgview, stdout);
329 greg 1.25 putc('\n', stdout);
330 greg 1.1 }
331 schorsch 2.37 if ((pixaspect < .99) | (pixaspect > 1.01))
332 greg 1.18 fputaspect(pixaspect, stdout);
333 greg 2.21 if (ourexp > 0)
334     ourexp *= rexpadj;
335     else
336     ourexp = rexpadj;
337 schorsch 2.37 if ((ourexp < .995) | (ourexp > 1.005))
338 greg 1.16 fputexpos(ourexp, stdout);
339 greg 2.27 if (strcmp(ourfmt, PICFMT)) /* print format if known */
340     fputformat(ourfmt, stdout);
341 greg 1.25 putc('\n', stdout);
342 greg 1.11 /* write picture */
343 greg 1.1 writepicture();
344 greg 1.11 /* write z file */
345     if (zfile != NULL)
346     writedistance(zfile);
347 greg 1.1
348     exit(0);
349 greg 1.10 userr:
350     fprintf(stderr,
351 greg 2.24 "Usage: %s [view opts][-t eps][-z zout][-e spec][-B][-a|-q][-fT][-n] pfile zspec ..\n",
352 greg 1.10 progname);
353     exit(1);
354 greg 1.1 #undef check
355     }
356    
357    
358 schorsch 2.40 static int
359     headline( /* process header string */
360     char *s,
361     void *p
362     )
363 greg 1.1 {
364 greg 2.47 char fmt[MAXFMTLEN];
365 greg 1.1
366 greg 2.13 if (isheadid(s))
367 gwlarson 2.31 return(0);
368 greg 2.13 if (formatval(fmt, s)) {
369 greg 2.27 if (globmatch(ourfmt, fmt)) {
370     wrongformat = 0;
371     strcpy(ourfmt, fmt);
372     } else
373     wrongformat = 1;
374 gwlarson 2.31 return(0);
375 greg 1.33 }
376 greg 2.24 if (nvavg < 2) {
377     putc('\t', stdout);
378     fputs(s, stdout);
379     }
380 greg 1.16 if (isexpos(s)) {
381     theirexp *= exposval(s);
382 gwlarson 2.31 return(0);
383 greg 1.16 }
384 greg 2.5 if (isview(s) && sscanview(&theirview, s) > 0)
385     gotview++;
386 gwlarson 2.31 return(0);
387 greg 1.1 }
388    
389    
390 schorsch 2.41 static int
391     nextview( /* get and set next view */
392     FILE *fp
393     )
394 greg 2.24 {
395     char linebuf[256];
396     char *err;
397 greg 2.44 int i;
398 greg 2.24
399     if (fp != NULL) {
400     do /* get new view */
401     if (fgets(linebuf, sizeof(linebuf), fp) == NULL)
402     return(EOF);
403     while (!isview(linebuf) || !sscanview(&ourview, linebuf));
404     }
405     /* set new view */
406     if ((err = setview(&ourview)) != NULL) {
407     fprintf(stderr, "%s: %s\n", progname, err);
408     exit(1);
409     }
410     if (!nvavg) { /* first view */
411 schorsch 2.36 avgview = ourview;
412 greg 2.24 return(nvavg++);
413     }
414     /* add to average view */
415     for (i = 0; i < 3; i++) {
416     avgview.vp[i] += ourview.vp[i];
417     avgview.vdir[i] += ourview.vdir[i];
418     avgview.vup[i] += ourview.vup[i];
419     }
420 greg 2.42 avgview.vdist += ourview.vdist;
421 greg 2.24 avgview.horiz += ourview.horiz;
422     avgview.vert += ourview.vert;
423     avgview.hoff += ourview.hoff;
424     avgview.voff += ourview.voff;
425     avgview.vfore += ourview.vfore;
426     avgview.vaft += ourview.vaft;
427     return(nvavg++);
428     }
429    
430    
431 schorsch 2.41 static void
432     compavgview(void) /* compute average view */
433 greg 2.24 {
434 greg 2.44 int i;
435 greg 2.24 double f;
436    
437     if (nvavg < 2)
438     return;
439     f = 1.0/nvavg;
440     for (i = 0; i < 3; i++) {
441     avgview.vp[i] *= f;
442     avgview.vdir[i] *= f;
443     avgview.vup[i] *= f;
444     }
445 greg 2.42 avgview.vdist *= f;
446 greg 2.24 avgview.horiz *= f;
447     avgview.vert *= f;
448     avgview.hoff *= f;
449     avgview.voff *= f;
450     avgview.vfore *= f;
451     avgview.vaft *= f;
452     if (setview(&avgview) != NULL) /* in case of emergency... */
453 schorsch 2.36 avgview = ourview;
454 greg 2.24 pixaspect = viewaspect(&avgview) * hresolu / vresolu;
455     }
456    
457    
458 schorsch 2.41 static void
459     addpicture( /* add picture to output */
460     char *pfile,
461     char *zspec
462     )
463 greg 1.1 {
464 greg 1.19 FILE *pfp;
465     int zfd;
466 greg 1.8 char *err;
467 greg 1.1 COLR *scanin;
468 greg 1.15 float *zin;
469     struct position *plast;
470 greg 2.16 struct bound *xlim, ylim;
471 greg 1.1 int y;
472 greg 1.10 /* open picture file */
473 greg 2.10 if ((pfp = fopen(pfile, "r")) == NULL)
474     syserror(pfile);
475 greg 1.16 /* get header with exposure and view */
476     theirexp = 1.0;
477 schorsch 2.36 theirview = stdview;
478 greg 1.16 gotview = 0;
479 greg 2.24 if (nvavg < 2)
480     printf("%s:\n", pfile);
481 greg 1.33 getheader(pfp, headline, NULL);
482 greg 1.34 if (wrongformat || !gotview || !fgetsresolu(&tresolu, pfp)) {
483 greg 1.33 fprintf(stderr, "%s: picture format error\n", pfile);
484 greg 1.1 exit(1);
485     }
486 greg 1.16 if (ourexp <= 0)
487     ourexp = theirexp;
488     else if (ABS(theirexp-ourexp) > .01*ourexp)
489     fprintf(stderr, "%s: different exposure (warning)\n", pfile);
490 schorsch 2.37 if ( (err = setview(&theirview)) ) {
491 greg 1.1 fprintf(stderr, "%s: %s\n", pfile, err);
492     exit(1);
493     }
494 greg 1.5 /* compute transformation */
495 greg 1.30 hasmatrix = pixform(theirs2ours, &theirview, &ourview);
496 greg 2.16 /* get z specification or file */
497 greg 1.34 zin = (float *)malloc(scanlen(&tresolu)*sizeof(float));
498 greg 2.16 if (zin == NULL)
499 greg 2.10 syserror(progname);
500 greg 2.50 if (isflt(zspec)) { /* depth is a constant? */
501     double zvalue = atof(zspec);
502 greg 2.44 int x;
503 greg 2.50 if (zvalue <= 0.0) {
504     fprintf(stderr, "%s: illegal Z-value %s\n",
505     progname, zspec);
506     exit(1);
507     }
508 greg 1.34 for (x = scanlen(&tresolu); x-- > 0; )
509 greg 1.10 zin[x] = zvalue;
510 greg 2.50 zfd = -1;
511     } else if ((zfd = open_float_depth(zspec, (long)tresolu.xr*tresolu.yr)) < 0)
512     exit(1);
513 greg 2.16 /* compute transferrable perimeter */
514     xlim = (struct bound *)malloc(numscans(&tresolu)*sizeof(struct bound));
515     if (xlim == NULL)
516     syserror(progname);
517     if (!getperim(xlim, &ylim, zin, zfd)) { /* overlapping area? */
518 greg 2.33 free((void *)zin);
519     free((void *)xlim);
520 greg 2.16 if (zfd != -1)
521     close(zfd);
522     fclose(pfp);
523     return;
524     }
525     /* allocate scanlines */
526     scanin = (COLR *)malloc(scanlen(&tresolu)*sizeof(COLR));
527     plast = (struct position *)calloc(scanlen(&tresolu),
528     sizeof(struct position));
529 schorsch 2.37 if ((scanin == NULL) | (plast == NULL))
530 greg 2.16 syserror(progname);
531     /* skip to starting point */
532     for (y = 0; y < ylim.min; y++)
533     if (freadcolrs(scanin, scanlen(&tresolu), pfp) < 0) {
534     fprintf(stderr, "%s: read error\n", pfile);
535     exit(1);
536     }
537     if (zfd != -1 && lseek(zfd,
538 greg 2.38 (off_t)ylim.min*scanlen(&tresolu)*sizeof(float),
539     SEEK_SET) < 0)
540 greg 2.16 syserror(zspec);
541 greg 1.1 /* load image */
542 greg 2.16 for (y = ylim.min; y <= ylim.max; y++) {
543 greg 1.34 if (freadcolrs(scanin, scanlen(&tresolu), pfp) < 0) {
544 greg 1.1 fprintf(stderr, "%s: read error\n", pfile);
545     exit(1);
546     }
547 greg 2.16 if (zfd != -1 && read(zfd, (char *)zin,
548 greg 1.34 scanlen(&tresolu)*sizeof(float))
549 greg 2.16 < scanlen(&tresolu)*sizeof(float))
550     syserror(zspec);
551     addscanline(xlim+y, y, scanin, zin, plast);
552 greg 1.1 }
553     /* clean up */
554 greg 2.33 free((void *)xlim);
555     free((void *)scanin);
556     free((void *)zin);
557     free((void *)plast);
558 greg 1.1 fclose(pfp);
559 greg 1.19 if (zfd != -1)
560     close(zfd);
561 greg 1.1 }
562    
563    
564 schorsch 2.41 static int
565     pixform( /* compute view1 to view2 matrix */
566 greg 2.44 MAT4 xfmat,
567     VIEW *vw1,
568     VIEW *vw2
569 schorsch 2.41 )
570 greg 1.5 {
571 greg 2.44 MAT4 m4t;
572 greg 1.5
573 schorsch 2.37 if ((vw1->type != VT_PER) & (vw1->type != VT_PAR))
574 greg 1.30 return(0);
575 schorsch 2.37 if ((vw2->type != VT_PER) & (vw2->type != VT_PAR))
576 greg 1.30 return(0);
577 greg 1.5 setident4(xfmat);
578 greg 1.17 xfmat[0][0] = vw1->hvec[0];
579     xfmat[0][1] = vw1->hvec[1];
580     xfmat[0][2] = vw1->hvec[2];
581     xfmat[1][0] = vw1->vvec[0];
582     xfmat[1][1] = vw1->vvec[1];
583     xfmat[1][2] = vw1->vvec[2];
584 greg 1.5 xfmat[2][0] = vw1->vdir[0];
585     xfmat[2][1] = vw1->vdir[1];
586     xfmat[2][2] = vw1->vdir[2];
587     xfmat[3][0] = vw1->vp[0];
588     xfmat[3][1] = vw1->vp[1];
589     xfmat[3][2] = vw1->vp[2];
590     setident4(m4t);
591 greg 1.17 m4t[0][0] = vw2->hvec[0]/vw2->hn2;
592     m4t[1][0] = vw2->hvec[1]/vw2->hn2;
593     m4t[2][0] = vw2->hvec[2]/vw2->hn2;
594     m4t[3][0] = -DOT(vw2->vp,vw2->hvec)/vw2->hn2;
595     m4t[0][1] = vw2->vvec[0]/vw2->vn2;
596     m4t[1][1] = vw2->vvec[1]/vw2->vn2;
597     m4t[2][1] = vw2->vvec[2]/vw2->vn2;
598     m4t[3][1] = -DOT(vw2->vp,vw2->vvec)/vw2->vn2;
599 greg 1.5 m4t[0][2] = vw2->vdir[0];
600     m4t[1][2] = vw2->vdir[1];
601     m4t[2][2] = vw2->vdir[2];
602     m4t[3][2] = -DOT(vw2->vp,vw2->vdir);
603     multmat4(xfmat, xfmat, m4t);
604 greg 1.30 return(1);
605 greg 1.5 }
606    
607    
608 schorsch 2.41 static void
609     addscanline( /* add scanline to output */
610     struct bound *xl,
611     int y,
612     COLR *pline,
613     float *zline,
614     struct position *lasty /* input/output */
615     )
616 greg 1.1 {
617 greg 1.30 FVECT pos;
618 greg 1.15 struct position lastx, newpos;
619 greg 2.19 double wt;
620 greg 2.44 int x;
621 greg 1.1
622 greg 1.20 lastx.z = 0;
623 greg 2.16 for (x = xl->max; x >= xl->min; x--) {
624 greg 1.34 pix2loc(pos, &tresolu, x, y);
625 greg 1.5 pos[2] = zline[x];
626 greg 2.19 if ((wt = movepixel(pos)) <= FTINY) {
627 greg 1.15 lasty[x].z = lastx.z = 0; /* mark invalid */
628 greg 1.1 continue;
629 greg 1.15 }
630 greg 2.19 /* add pixel to our image */
631 greg 1.17 newpos.x = pos[0] * hresolu;
632     newpos.y = pos[1] * vresolu;
633 greg 1.15 newpos.z = zline[x];
634 greg 2.19 addpixel(&newpos, &lastx, &lasty[x], pline[x], wt, pos[2]);
635     lasty[x].x = lastx.x = newpos.x;
636     lasty[x].y = lastx.y = newpos.y;
637     lasty[x].z = lastx.z = newpos.z;
638 greg 1.1 }
639     }
640    
641    
642 schorsch 2.41 static void
643     addpixel( /* fill in pixel parallelogram */
644     struct position *p0,
645     struct position *p1,
646     struct position *p2,
647     COLR pix,
648     double w,
649     double z
650     )
651 greg 1.8 {
652 greg 1.15 double zt = 2.*zeps*p0->z; /* threshold */
653 greg 2.19 COLOR pval; /* converted+weighted pixel */
654 greg 1.15 int s1x, s1y, s2x, s2y; /* step sizes */
655     int l1, l2, c1, c2; /* side lengths and counters */
656     int p1isy; /* p0p1 along y? */
657     int x1, y1; /* p1 position */
658 greg 2.44 int x, y; /* final position */
659 greg 1.15
660     /* compute vector p0p1 */
661 greg 1.25 if (fillo&F_FORE && ABS(p1->z-p0->z) <= zt) {
662 greg 1.15 s1x = p1->x - p0->x;
663     s1y = p1->y - p0->y;
664     l1 = ABS(s1x);
665 schorsch 2.37 if ( (p1isy = (ABS(s1y) > l1)) )
666 greg 1.15 l1 = ABS(s1y);
667 greg 2.20 else if (l1 < 1)
668 greg 2.19 l1 = 1;
669 greg 1.15 } else {
670     l1 = s1x = s1y = 1;
671     p1isy = -1;
672     }
673     /* compute vector p0p2 */
674 greg 1.25 if (fillo&F_FORE && ABS(p2->z-p0->z) <= zt) {
675 greg 1.15 s2x = p2->x - p0->x;
676     s2y = p2->y - p0->y;
677     if (p1isy == 1)
678     l2 = ABS(s2x);
679     else {
680     l2 = ABS(s2y);
681     if (p1isy != 0 && ABS(s2x) > l2)
682     l2 = ABS(s2x);
683     }
684 greg 2.19 if (l2 < 1)
685     l2 = 1;
686 greg 1.15 } else
687     l2 = s2x = s2y = 1;
688     /* fill the parallelogram */
689 greg 2.19 if (averaging) {
690     colr_color(pval, pix);
691     scalecolor(pval, w);
692     }
693 greg 1.15 for (c1 = l1; c1-- > 0; ) {
694     x1 = p0->x + c1*s1x/l1;
695     y1 = p0->y + c1*s1y/l1;
696     for (c2 = l2; c2-- > 0; ) {
697     x = x1 + c2*s2x/l2;
698 schorsch 2.37 if ((x < 0) | (x >= hresolu))
699 greg 1.28 continue;
700 greg 1.15 y = y1 + c2*s2y/l2;
701 schorsch 2.37 if ((y < 0) | (y >= vresolu))
702 greg 1.28 continue;
703 greg 2.19 if (averaging) {
704     if (zscan(y)[x] <= 0 || zscan(y)[x]-z
705 greg 1.15 > zeps*zscan(y)[x]) {
706 greg 2.19 copycolor(sscan(y)[x], pval);
707     wscan(y)[x] = w;
708     zscan(y)[x] = z;
709     } else if (z-zscan(y)[x] <= zeps*zscan(y)[x]) {
710     addcolor(sscan(y)[x], pval);
711     wscan(y)[x] += w;
712     }
713     } else if (zscan(y)[x] <= 0 || zscan(y)[x]-z
714     > zeps*zscan(y)[x]) {
715     copycolr(pscan(y)[x], pix);
716 greg 1.8 zscan(y)[x] = z;
717     }
718 greg 1.15 }
719     }
720 greg 2.16 }
721    
722    
723 schorsch 2.41 static double
724     movepixel( /* reposition image point */
725 greg 2.44 FVECT pos
726 schorsch 2.41 )
727 greg 2.18 {
728 greg 2.19 FVECT pt, tdir, odir;
729 greg 2.20 double d;
730 greg 2.18
731     if (pos[2] <= 0) /* empty pixel */
732 greg 2.19 return(0);
733 greg 2.22 if (usematrix) {
734 greg 2.18 pos[0] += theirview.hoff - .5;
735     pos[1] += theirview.voff - .5;
736 schorsch 2.37 if (normdist & (theirview.type == VT_PER))
737 greg 2.23 d = sqrt(1. + pos[0]*pos[0]*theirview.hn2
738     + pos[1]*pos[1]*theirview.vn2);
739     else
740     d = 1.;
741     pos[2] += d*theirview.vfore;
742 greg 2.18 if (theirview.type == VT_PER) {
743 greg 2.23 pos[2] /= d;
744 greg 2.18 pos[0] *= pos[2];
745     pos[1] *= pos[2];
746     }
747     multp3(pos, pos, theirs2ours);
748 greg 2.23 if (pos[2] <= ourview.vfore)
749 greg 2.19 return(0);
750 greg 2.18 if (ourview.type == VT_PER) {
751     pos[0] /= pos[2];
752     pos[1] /= pos[2];
753     }
754     pos[0] += .5 - ourview.hoff;
755     pos[1] += .5 - ourview.voff;
756 greg 2.50 if ((pos[0] < 0) | (pos[0] >= 1-FTINY) |
757     (pos[1] < 0) | (pos[1] >= 1-FTINY))
758     return(0);
759 greg 2.23 pos[2] -= ourview.vfore;
760 greg 2.19 } else {
761     if (viewray(pt, tdir, &theirview, pos[0], pos[1]) < -FTINY)
762     return(0);
763 greg 2.50 if (!normdist & (theirview.type == VT_PER)) /* adjust */
764 greg 2.45 pos[2] /= DOT(theirview.vdir, tdir);
765 greg 2.19 pt[0] += tdir[0]*pos[2];
766     pt[1] += tdir[1]*pos[2];
767     pt[2] += tdir[2]*pos[2];
768 greg 2.50 if (viewloc(pos, &ourview, pt) != VL_GOOD)
769 greg 2.19 return(0);
770     }
771     if (!averaging)
772     return(1);
773 gwlarson 2.32 /* compute pixel weight */
774     if (ourview.type == VT_PAR) {
775     d = DOT(ourview.vdir,tdir);
776     d = 1. - d*d;
777     } else {
778     VSUB(odir, pt, ourview.vp);
779     d = DOT(odir,tdir);
780     d = 1. - d*d/DOT(odir,odir);
781     }
782     if (d <= 1./MAXWT/MAXWT)
783 greg 2.19 return(MAXWT); /* clip to maximum weight */
784 gwlarson 2.32 return(1./sqrt(d));
785 greg 2.18 }
786    
787    
788 schorsch 2.41 static int
789     getperim( /* compute overlapping image area */
790 greg 2.44 struct bound *xl,
791 schorsch 2.41 struct bound *yl,
792     float *zline,
793     int zfd
794     )
795 greg 2.16 {
796     int step;
797     FVECT pos;
798 greg 2.44 int x, y;
799 greg 2.16 /* set up step size */
800     if (scanlen(&tresolu) < numscans(&tresolu))
801     step = scanlen(&tresolu)/NSTEPS;
802     else
803     step = numscans(&tresolu)/NSTEPS;
804     if (step < MINSTEP) { /* not worth cropping? */
805     yl->min = 0;
806     yl->max = numscans(&tresolu) - 1;
807     x = scanlen(&tresolu) - 1;
808     for (y = numscans(&tresolu); y--; ) {
809     xl[y].min = 0;
810     xl[y].max = x;
811     }
812     return(1);
813     }
814     yl->min = 32000; yl->max = 0; /* search for points on image */
815     for (y = step - 1; y < numscans(&tresolu); y += step) {
816     if (zfd != -1) {
817 greg 2.33 if (lseek(zfd, (off_t)y*scanlen(&tresolu)*sizeof(float),
818 greg 2.38 SEEK_SET) < 0)
819 greg 2.16 syserror("lseek");
820     if (read(zfd, (char *)zline,
821     scanlen(&tresolu)*sizeof(float))
822     < scanlen(&tresolu)*sizeof(float))
823     syserror("read");
824     }
825     xl[y].min = 32000; xl[y].max = 0; /* x max */
826     for (x = scanlen(&tresolu); (x -= step) > 0; ) {
827     pix2loc(pos, &tresolu, x, y);
828     pos[2] = zline[x];
829 greg 2.19 if (movepixel(pos) > FTINY) {
830 greg 2.16 xl[y].max = x + step - 1;
831     xl[y].min = x - step + 1; /* x min */
832     if (xl[y].min < 0)
833     xl[y].min = 0;
834     for (x = step - 1; x < xl[y].max; x += step) {
835     pix2loc(pos, &tresolu, x, y);
836     pos[2] = zline[x];
837 greg 2.19 if (movepixel(pos) > FTINY) {
838 greg 2.16 xl[y].min = x - step + 1;
839     break;
840     }
841     }
842     if (y < yl->min) /* y limits */
843     yl->min = y - step + 1;
844     yl->max = y + step - 1;
845     break;
846     }
847     }
848     /* fill in between */
849 greg 2.18 if (y < step) {
850 greg 2.16 xl[y-1].min = xl[y].min;
851     xl[y-1].max = xl[y].max;
852 greg 2.18 } else {
853     if (xl[y].min < xl[y-step].min)
854     xl[y-1].min = xl[y].min;
855     else
856     xl[y-1].min = xl[y-step].min;
857     if (xl[y].max > xl[y-step].max)
858     xl[y-1].max = xl[y].max;
859     else
860     xl[y-1].max = xl[y-step].max;
861     }
862 greg 2.16 for (x = 2; x < step; x++)
863 schorsch 2.36 *(xl+y-x) = *(xl+y-1);
864 greg 2.16 }
865     if (yl->max >= numscans(&tresolu))
866     yl->max = numscans(&tresolu) - 1;
867 greg 2.20 y -= step;
868 greg 2.16 for (x = numscans(&tresolu) - 1; x > y; x--) /* fill bottom rows */
869 schorsch 2.36 *(xl+x) = *(xl+y);
870 greg 2.16 return(yl->max >= yl->min);
871 greg 1.8 }
872    
873    
874 schorsch 2.41 static void
875     backpicture( /* background fill algorithm */
876     fillfunc_t *fill,
877     int samp
878     )
879 greg 1.1 {
880 greg 1.2 int *yback, xback;
881 greg 1.1 int y;
882 greg 2.44 int x, i;
883 greg 1.2 /* get back buffer */
884 greg 1.17 yback = (int *)malloc(hresolu*sizeof(int));
885 greg 1.15 if (yback == NULL)
886 greg 2.10 syserror(progname);
887 greg 1.17 for (x = 0; x < hresolu; x++)
888 greg 1.4 yback[x] = -2;
889 greg 1.7 /*
890     * Xback and yback are the pixel locations of suitable
891     * background values in each direction.
892     * A value of -2 means unassigned, and -1 means
893     * that there is no suitable background in this direction.
894     */
895 greg 1.2 /* fill image */
896 greg 1.17 for (y = 0; y < vresolu; y++) {
897 greg 1.4 xback = -2;
898 greg 1.17 for (x = 0; x < hresolu; x++)
899 greg 1.8 if (zscan(y)[x] <= 0) { /* empty pixel */
900 greg 1.7 /*
901     * First, find background from above or below.
902     * (farthest assigned pixel)
903     */
904 greg 1.4 if (yback[x] == -2) {
905 greg 1.17 for (i = y+1; i < vresolu; i++)
906 greg 1.8 if (zscan(i)[x] > 0)
907 greg 1.4 break;
908 greg 1.17 if (i < vresolu
909 greg 1.2 && (y <= 0 || zscan(y-1)[x] < zscan(i)[x]))
910 greg 1.4 yback[x] = i;
911     else
912     yback[x] = y-1;
913 greg 1.2 }
914 greg 1.7 /*
915     * Next, find background from left or right.
916     */
917 greg 1.4 if (xback == -2) {
918 greg 1.17 for (i = x+1; i < hresolu; i++)
919 greg 1.8 if (zscan(y)[i] > 0)
920 greg 1.4 break;
921 greg 1.17 if (i < hresolu
922 greg 1.4 && (x <= 0 || zscan(y)[x-1] < zscan(y)[i]))
923     xback = i;
924     else
925     xback = x-1;
926     }
927 greg 1.7 /*
928 greg 1.26 * If we have no background for this pixel,
929     * use the given fill function.
930 greg 1.11 */
931 greg 1.27 if (xback < 0 && yback[x] < 0)
932     goto fillit;
933 greg 1.11 /*
934 greg 1.7 * Compare, and use the background that is
935     * farther, unless one of them is next to us.
936 greg 1.27 * If the background is too distant, call
937     * the fill function.
938 greg 1.7 */
939 greg 1.11 if ( yback[x] < 0
940     || (xback >= 0 && ABS(x-xback) <= 1)
941 greg 1.4 || ( ABS(y-yback[x]) > 1
942 greg 1.11 && zscan(yback[x])[x]
943 greg 1.13 < zscan(y)[xback] ) ) {
944 greg 1.27 if (samp > 0 && ABS(x-xback) >= samp)
945     goto fillit;
946 greg 2.19 if (averaging) {
947     copycolor(sscan(y)[x],
948     sscan(y)[xback]);
949     wscan(y)[x] = wscan(y)[xback];
950     } else
951     copycolr(pscan(y)[x],
952     pscan(y)[xback]);
953 greg 1.13 zscan(y)[x] = zscan(y)[xback];
954     } else {
955 greg 1.27 if (samp > 0 && ABS(y-yback[x]) > samp)
956     goto fillit;
957 greg 2.19 if (averaging) {
958     copycolor(sscan(y)[x],
959     sscan(yback[x])[x]);
960     wscan(y)[x] =
961     wscan(yback[x])[x];
962     } else
963     copycolr(pscan(y)[x],
964     pscan(yback[x])[x]);
965 greg 1.13 zscan(y)[x] = zscan(yback[x])[x];
966 greg 1.27 }
967     continue;
968     fillit:
969     (*fill)(x,y);
970     if (fill == rcalfill) { /* use it */
971     clearqueue();
972     xback = x;
973     yback[x] = y;
974 greg 1.13 }
975 greg 1.4 } else { /* full pixel */
976     yback[x] = -2;
977     xback = -2;
978     }
979     }
980 greg 2.33 free((void *)yback);
981 greg 1.1 }
982    
983    
984 schorsch 2.41 static void
985     fillpicture( /* paint in empty pixels using fill */
986     fillfunc_t *fill
987     )
988 greg 1.11 {
989 greg 2.44 int x, y;
990 greg 1.11
991 greg 1.17 for (y = 0; y < vresolu; y++)
992     for (x = 0; x < hresolu; x++)
993 greg 1.11 if (zscan(y)[x] <= 0)
994 greg 1.25 (*fill)(x,y);
995 greg 2.26 if (fill == rcalfill)
996     clearqueue();
997 greg 2.15 }
998    
999    
1000 schorsch 2.41 static int
1001     clipaft(void) /* perform aft clipping as indicated */
1002 greg 2.15 {
1003 greg 2.44 int x, y;
1004 schorsch 2.37 int adjtest = (ourview.type == VT_PER) & zisnorm;
1005 greg 2.15 double tstdist;
1006     double yzn2, vx;
1007    
1008     if (ourview.vaft <= FTINY)
1009 greg 2.24 return(0);
1010 greg 2.17 tstdist = ourview.vaft - ourview.vfore;
1011 greg 2.15 for (y = 0; y < vresolu; y++) {
1012 greg 2.22 if (adjtest) { /* adjust test */
1013 greg 2.15 yzn2 = (y+.5)/vresolu + ourview.voff - .5;
1014     yzn2 = 1. + yzn2*yzn2*ourview.vn2;
1015 greg 2.17 tstdist = (ourview.vaft - ourview.vfore)*sqrt(yzn2);
1016 greg 2.15 }
1017     for (x = 0; x < hresolu; x++)
1018     if (zscan(y)[x] > tstdist) {
1019 greg 2.22 if (adjtest) {
1020 greg 2.15 vx = (x+.5)/hresolu + ourview.hoff - .5;
1021 greg 2.17 if (zscan(y)[x] <= (ourview.vaft -
1022     ourview.vfore) *
1023 greg 2.15 sqrt(vx*vx*ourview.hn2 + yzn2))
1024     continue;
1025     }
1026 greg 2.19 if (averaging)
1027 schorsch 2.35 memset(sscan(y)[x], '\0', sizeof(COLOR));
1028 greg 2.19 else
1029 schorsch 2.35 memset(pscan(y)[x], '\0', sizeof(COLR));
1030 greg 2.15 zscan(y)[x] = 0.0;
1031     }
1032     }
1033 greg 2.24 return(1);
1034 greg 1.11 }
1035    
1036    
1037 schorsch 2.41 static int
1038     addblur(void) /* add to blurred picture */
1039 greg 2.24 {
1040     COLOR cval;
1041     double d;
1042 greg 2.44 int i;
1043 greg 2.24
1044     if (!blurring)
1045     return(0);
1046     i = hresolu*vresolu;
1047     if (nvavg < 2)
1048     if (averaging)
1049     while (i--) {
1050     copycolor(ourbpict[i], ourspict[i]);
1051     d = 1.0/ourweigh[i];
1052     scalecolor(ourbpict[i], d);
1053     }
1054     else
1055     while (i--)
1056     colr_color(ourbpict[i], ourpict[i]);
1057     else
1058     if (averaging)
1059     while (i--) {
1060     copycolor(cval, ourspict[i]);
1061     d = 1.0/ourweigh[i];
1062     scalecolor(cval, d);
1063     addcolor(ourbpict[i], cval);
1064     }
1065     else
1066     while (i--) {
1067     colr_color(cval, ourpict[i]);
1068     addcolor(ourbpict[i], cval);
1069     }
1070     /* print view */
1071     printf("VIEW%d:", nvavg);
1072     fprintview(&ourview, stdout);
1073     putchar('\n');
1074     return(1);
1075     }
1076    
1077    
1078 schorsch 2.41 static void
1079     writepicture(void) /* write out picture (alters buffer) */
1080 greg 1.1 {
1081     int y;
1082 greg 2.44 int x;
1083 greg 2.19 double d;
1084 greg 1.1
1085 greg 1.34 fprtresolu(hresolu, vresolu, stdout);
1086 greg 1.17 for (y = vresolu-1; y >= 0; y--)
1087 greg 2.24 if (blurring) {
1088     for (x = 0; x < hresolu; x++) { /* compute avg. */
1089     d = rexpadj/nvavg;
1090     scalecolor(bscan(y)[x], d);
1091     }
1092     if (fwritescan(bscan(y), hresolu, stdout) < 0)
1093     syserror(progname);
1094     } else if (averaging) {
1095 greg 2.19 for (x = 0; x < hresolu; x++) { /* average pixels */
1096 greg 2.21 d = rexpadj/wscan(y)[x];
1097 greg 2.19 scalecolor(sscan(y)[x], d);
1098     }
1099     if (fwritescan(sscan(y), hresolu, stdout) < 0)
1100     syserror(progname);
1101 greg 2.21 } else {
1102     if (expadj)
1103     shiftcolrs(pscan(y), hresolu, expadj);
1104     if (fwritecolrs(pscan(y), hresolu, stdout) < 0)
1105     syserror(progname);
1106     }
1107 greg 1.11 }
1108    
1109    
1110 schorsch 2.41 static void
1111     writedistance( /* write out z file (alters buffer) */
1112     char *fname
1113     )
1114 greg 1.11 {
1115 greg 2.22 int donorm = normdist & !zisnorm ? 1 :
1116 schorsch 2.37 (ourview.type == VT_PER) & !normdist & zisnorm ? -1 : 0;
1117 greg 1.19 int fd;
1118 greg 1.11 int y;
1119    
1120 greg 2.10 if ((fd = open(fname, O_WRONLY|O_CREAT|O_TRUNC, 0666)) == -1)
1121     syserror(fname);
1122 greg 1.17 for (y = vresolu-1; y >= 0; y--) {
1123 greg 1.11 if (donorm) {
1124 greg 2.22 double vx, yzn2, d;
1125 greg 2.44 int x;
1126 greg 1.29 yzn2 = (y+.5)/vresolu + ourview.voff - .5;
1127 greg 1.17 yzn2 = 1. + yzn2*yzn2*ourview.vn2;
1128     for (x = 0; x < hresolu; x++) {
1129 greg 1.29 vx = (x+.5)/hresolu + ourview.hoff - .5;
1130 greg 2.22 d = sqrt(vx*vx*ourview.hn2 + yzn2);
1131     if (donorm > 0)
1132     zscan(y)[x] *= d;
1133     else
1134     zscan(y)[x] /= d;
1135 greg 1.11 }
1136 greg 2.22 }
1137     if (write(fd, (char *)zscan(y), hresolu*sizeof(float))
1138 greg 2.10 < hresolu*sizeof(float))
1139     syserror(fname);
1140 greg 1.11 }
1141 greg 1.19 close(fd);
1142 greg 1.10 }
1143    
1144    
1145 schorsch 2.41 static void
1146     backfill( /* fill pixel with background */
1147     int x,
1148     int y
1149     )
1150 greg 1.12 {
1151 greg 2.19 if (averaging) {
1152     copycolor(sscan(y)[x], backcolor);
1153     wscan(y)[x] = 1;
1154     } else
1155     copycolr(pscan(y)[x], backcolr);
1156 greg 1.13 zscan(y)[x] = backz;
1157     }
1158    
1159    
1160 schorsch 2.41 static void
1161     calstart( /* start fill calculation */
1162     char *prog,
1163     char *args
1164     )
1165 greg 1.13 {
1166     char combuf[512];
1167 greg 2.3 char *argv[64];
1168     int rval;
1169 greg 2.44 char **wp, *cp;
1170 greg 1.13
1171 greg 2.49 if (PDesc.flags & PF_RUNNING) {
1172 greg 1.14 fprintf(stderr, "%s: too many calculations\n", progname);
1173     exit(1);
1174     }
1175 greg 2.3 strcpy(combuf, prog);
1176     strcat(combuf, args);
1177     cp = combuf;
1178     wp = argv;
1179     for ( ; ; ) {
1180 greg 2.11 while (isspace(*cp)) /* nullify spaces */
1181     *cp++ = '\0';
1182     if (!*cp) /* all done? */
1183     break;
1184     *wp++ = cp; /* add argument to list */
1185     while (*++cp && !isspace(*cp))
1186     ;
1187 greg 2.3 }
1188     *wp = NULL;
1189     /* start process */
1190 schorsch 2.34 if ((rval = open_process(&PDesc, argv)) < 0)
1191 greg 2.10 syserror(progname);
1192 greg 2.3 if (rval == 0) {
1193     fprintf(stderr, "%s: command not found\n", argv[0]);
1194     exit(1);
1195 greg 1.13 }
1196 greg 2.3 packsiz = rval/(6*sizeof(float)) - 1;
1197     if (packsiz > PACKSIZ)
1198     packsiz = PACKSIZ;
1199 greg 1.13 queuesiz = 0;
1200     }
1201    
1202    
1203 schorsch 2.41 static void
1204     caldone(void) /* done with calculation */
1205 greg 1.13 {
1206 greg 2.49 if (!(PDesc.flags & PF_RUNNING))
1207 greg 1.14 return;
1208 greg 1.25 clearqueue();
1209 schorsch 2.34 close_process(&PDesc);
1210 greg 1.13 }
1211    
1212    
1213 schorsch 2.41 static void
1214     rcalfill( /* fill with ray-calculated pixel */
1215     int x,
1216     int y
1217     )
1218 greg 1.13 {
1219 greg 2.3 if (queuesiz >= packsiz) /* flush queue if needed */
1220 greg 1.25 clearqueue();
1221 greg 1.22 /* add position to queue */
1222 greg 1.13 queue[queuesiz][0] = x;
1223     queue[queuesiz][1] = y;
1224     queuesiz++;
1225     }
1226    
1227    
1228 schorsch 2.41 static void
1229     clearqueue(void) /* process queue */
1230 greg 1.13 {
1231 greg 1.22 FVECT orig, dir;
1232 greg 2.3 float fbuf[6*(PACKSIZ+1)];
1233 greg 2.44 float *fbp;
1234     int i;
1235 greg 2.22 double vx, vy;
1236 greg 1.13
1237 greg 2.10 if (queuesiz == 0)
1238     return;
1239 greg 2.3 fbp = fbuf;
1240 greg 1.13 for (i = 0; i < queuesiz; i++) {
1241 greg 1.22 viewray(orig, dir, &ourview,
1242     (queue[i][0]+.5)/hresolu,
1243     (queue[i][1]+.5)/vresolu);
1244 greg 2.3 *fbp++ = orig[0]; *fbp++ = orig[1]; *fbp++ = orig[2];
1245     *fbp++ = dir[0]; *fbp++ = dir[1]; *fbp++ = dir[2];
1246 greg 1.22 }
1247 greg 2.3 /* mark end and get results */
1248 schorsch 2.35 memset((char *)fbp, '\0', 6*sizeof(float));
1249 schorsch 2.34 if (process(&PDesc, (char *)fbuf, (char *)fbuf,
1250 greg 2.33 4*sizeof(float)*(queuesiz+1),
1251 greg 2.3 6*sizeof(float)*(queuesiz+1)) !=
1252 gregl 2.29 4*sizeof(float)*(queuesiz+1)) {
1253 greg 2.3 fprintf(stderr, "%s: error reading from rtrace process\n",
1254     progname);
1255     exit(1);
1256     }
1257     fbp = fbuf;
1258 greg 1.22 for (i = 0; i < queuesiz; i++) {
1259 greg 1.16 if (ourexp > 0 && ourexp != 1.0) {
1260 greg 2.3 fbp[0] *= ourexp;
1261     fbp[1] *= ourexp;
1262     fbp[2] *= ourexp;
1263 greg 1.14 }
1264 greg 2.19 if (averaging) {
1265     setcolor(sscan(queue[i][1])[queue[i][0]],
1266     fbp[0], fbp[1], fbp[2]);
1267 greg 2.26 wscan(queue[i][1])[queue[i][0]] = 1;
1268 greg 2.19 } else
1269     setcolr(pscan(queue[i][1])[queue[i][0]],
1270     fbp[0], fbp[1], fbp[2]);
1271 greg 2.22 if (zisnorm)
1272     zscan(queue[i][1])[queue[i][0]] = fbp[3];
1273     else {
1274     vx = (queue[i][0]+.5)/hresolu + ourview.hoff - .5;
1275     vy = (queue[i][1]+.5)/vresolu + ourview.voff - .5;
1276     zscan(queue[i][1])[queue[i][0]] = fbp[3] / sqrt(1. +
1277     vx*vx*ourview.hn2 + vy*vy*ourview.vn2);
1278     }
1279 greg 2.3 fbp += 4;
1280 greg 1.13 }
1281     queuesiz = 0;
1282 greg 1.14 }
1283    
1284    
1285 schorsch 2.41 static void
1286     syserror( /* report error and exit */
1287     char *s
1288     )
1289 greg 1.14 {
1290 greg 2.10 perror(s);
1291 greg 1.14 exit(1);
1292 greg 1.1 }