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root/radiance/ray/src/px/pinterp.c
Revision: 2.53
Committed: Tue Jun 3 21:31:51 2025 UTC (3 days, 21 hours ago) by greg
Content type: text/plain
Branch: MAIN
CVS Tags: HEAD
Changes since 2.52: +2 -4 lines
Log Message: 
refactor: More consistent use of global char * progname and fixargv0()

File Contents

# User Rev Content
1 greg 1.1 #ifndef lint
2 greg 2.53 static const char RCSid[] = "$Id: pinterp.c,v 2.52 2024/06/11 17:23:25 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 1.25 int fillo = F_FORE|F_BACK; /* selected fill options */
68 greg 1.26 int fillsamp = 0; /* sample separation (0 == inf) */
69 greg 1.11 COLR backcolr = BLKCOLR; /* background color */
70 greg 2.19 COLOR backcolor = BLKCOLOR; /* background color (float) */
71 greg 1.13 double backz = 0.0; /* background z value */
72 greg 2.22 int normdist = 1; /* i/o normalized distance? */
73 greg 2.51 char ourfmt[MAXFMTLEN] = PICFMT; /* original picture format */
74 greg 2.21 double ourexp = -1; /* original picture exposure */
75     int expadj = 0; /* exposure adjustment (f-stops) */
76     double rexpadj = 1; /* real exposure adjustment */
77 greg 1.11
78 greg 2.24 VIEW theirview; /* input view */
79 greg 1.16 int gotview; /* got input view? */
80 greg 1.33 int wrongformat = 0; /* input in another format? */
81 greg 1.34 RESOLU tresolu; /* input resolution */
82 greg 1.17 double theirexp; /* input picture exposure */
83 greg 2.19 MAT4 theirs2ours; /* transformation matrix */
84 greg 1.30 int hasmatrix = 0; /* has transformation matrix */
85 greg 1.1
86 schorsch 2.34 static SUBPROC PDesc = SP_INACTIVE; /* rtrace process descriptor */
87 greg 2.3 unsigned short queue[PACKSIZ][2]; /* pending pixels */
88     int packsiz; /* actual packet size */
89 greg 2.26 int queuesiz = 0; /* number of pixels pending */
90 greg 1.5
91 schorsch 2.41 typedef void fillfunc_t(int x, int y);
92 greg 1.13
93 schorsch 2.40 static gethfunc headline;
94 schorsch 2.41 static int nextview(FILE *fp);
95     static void compavgview(void);
96     static void addpicture(char *pfile, char *zspec);
97     static int pixform(MAT4 xfmat, VIEW *vw1, VIEW *vw2);
98     static void addscanline(struct bound *xl, int y,
99     COLR *pline, float *zline, struct position *lasty);
100     static void addpixel(struct position *p0, struct position *p1,
101     struct position *p2, COLR pix, double w, double z);
102     static double movepixel(FVECT pos);
103     static int getperim(struct bound *xl, struct bound *yl, float *zline, int zfd);
104     static void backpicture(fillfunc_t *fill, int samp);
105     static void fillpicture(fillfunc_t *fill);
106     static int clipaft(void);
107     static int addblur(void);
108     static void writepicture(void);
109     static void writedistance(char *fname);
110     static fillfunc_t backfill;
111     static fillfunc_t rcalfill;
112     static void calstart(char *prog, char *args);
113     static void caldone(void);
114     static void clearqueue(void);
115     static void syserror(char *s);
116    
117     fillfunc_t *fillfunc = backfill; /* selected fill function */
118    
119     int
120     main( /* interpolate pictures */
121     int argc,
122     char *argv[]
123     )
124 greg 1.1 {
125 greg 2.24 #define check(ol,al) if (argv[an][ol] || \
126     badarg(argc-an-1,argv+an+1,al)) \
127 greg 2.3 goto badopt
128 greg 1.1 int gotvfile = 0;
129 greg 2.19 int doavg = -1;
130 greg 2.24 int doblur = 0;
131 greg 1.11 char *zfile = NULL;
132 greg 2.21 char *expcomp = NULL;
133 greg 2.24 int i, an, rval;
134 greg 1.1
135 greg 2.43 SET_DEFAULT_BINARY();
136     SET_FILE_BINARY(stdout);
137    
138 greg 2.53 fixargv0(argv[0]); /* sets global progname */
139 greg 1.1
140 greg 2.24 for (an = 1; an < argc && argv[an][0] == '-'; an++) {
141     rval = getviewopt(&ourview, argc-an, argv+an);
142 greg 1.17 if (rval >= 0) {
143 greg 2.24 an += rval;
144 greg 1.17 continue;
145     }
146 greg 2.24 switch (argv[an][1]) {
147 greg 2.21 case 'e': /* exposure */
148     check(2,"f");
149 greg 2.24 expcomp = argv[++an];
150 greg 2.21 break;
151 greg 1.1 case 't': /* threshold */
152 greg 2.3 check(2,"f");
153 greg 2.24 zeps = atof(argv[++an]);
154 greg 1.1 break;
155 greg 2.19 case 'a': /* average */
156     check(2,NULL);
157     doavg = 1;
158     break;
159 greg 2.24 case 'B': /* blur views */
160     check(2,NULL);
161     doblur = 1;
162     break;
163 greg 2.19 case 'q': /* quick (no avg.) */
164     check(2,NULL);
165     doavg = 0;
166     break;
167 greg 1.11 case 'n': /* dist. normalized? */
168 greg 2.3 check(2,NULL);
169 greg 1.11 normdist = !normdist;
170 greg 1.10 break;
171 greg 1.11 case 'f': /* fill type */
172 greg 2.24 switch (argv[an][2]) {
173 greg 1.11 case '0': /* none */
174 greg 2.3 check(3,NULL);
175 greg 1.25 fillo = 0;
176 greg 1.11 break;
177     case 'f': /* foreground */
178 greg 2.3 check(3,NULL);
179 greg 1.25 fillo = F_FORE;
180 greg 1.11 break;
181     case 'b': /* background */
182 greg 2.3 check(3,NULL);
183 greg 1.25 fillo = F_BACK;
184 greg 1.11 break;
185     case 'a': /* all */
186 greg 2.3 check(3,NULL);
187 greg 1.25 fillo = F_FORE|F_BACK;
188 greg 1.11 break;
189 greg 1.25 case 's': /* sample */
190 greg 2.3 check(3,"i");
191 greg 2.24 fillsamp = atoi(argv[++an]);
192 greg 1.25 break;
193 greg 1.11 case 'c': /* color */
194 greg 2.3 check(3,"fff");
195 greg 1.25 fillfunc = backfill;
196 greg 2.24 setcolor(backcolor, atof(argv[an+1]),
197     atof(argv[an+2]), atof(argv[an+3]));
198 greg 2.19 setcolr(backcolr, colval(backcolor,RED),
199     colval(backcolor,GRN),
200     colval(backcolor,BLU));
201 greg 2.24 an += 3;
202 greg 1.11 break;
203 greg 1.13 case 'z': /* z value */
204 greg 2.3 check(3,"f");
205 greg 1.25 fillfunc = backfill;
206 greg 2.24 backz = atof(argv[++an]);
207 greg 1.13 break;
208     case 'r': /* rtrace */
209 greg 2.3 check(3,"s");
210 greg 1.25 fillfunc = rcalfill;
211 greg 2.24 calstart(RTCOM, argv[++an]);
212 greg 1.13 break;
213 greg 1.11 default:
214     goto badopt;
215     }
216     break;
217     case 'z': /* z file */
218 greg 2.3 check(2,"s");
219 greg 2.24 zfile = argv[++an];
220 greg 1.11 break;
221 greg 1.6 case 'x': /* x resolution */
222 greg 2.3 check(2,"i");
223 greg 2.24 hresolu = atoi(argv[++an]);
224 greg 1.6 break;
225     case 'y': /* y resolution */
226 greg 2.3 check(2,"i");
227 greg 2.24 vresolu = atoi(argv[++an]);
228 greg 1.6 break;
229 greg 1.18 case 'p': /* pixel aspect */
230 greg 2.24 if (argv[an][2] != 'a')
231 greg 2.6 goto badopt;
232     check(3,"f");
233 greg 2.24 pixaspect = atof(argv[++an]);
234 greg 1.18 break;
235 greg 1.17 case 'v': /* view file */
236 greg 2.24 if (argv[an][2] != 'f')
237 greg 1.1 goto badopt;
238 greg 2.3 check(3,"s");
239 greg 2.33 gotvfile = viewfile(argv[++an], &ourview, NULL);
240 greg 2.10 if (gotvfile < 0)
241 greg 2.24 syserror(argv[an]);
242 greg 2.10 else if (gotvfile == 0) {
243 greg 1.17 fprintf(stderr, "%s: bad view file\n",
244 greg 2.24 argv[an]);
245 greg 1.17 exit(1);
246 greg 1.1 }
247     break;
248     default:
249     badopt:
250 greg 1.10 fprintf(stderr, "%s: command line error at '%s'\n",
251 greg 2.24 progname, argv[an]);
252 greg 1.10 goto userr;
253 greg 1.1 }
254 greg 1.17 }
255 greg 1.1 /* check arguments */
256 greg 2.24 if ((argc-an)%2)
257 greg 1.10 goto userr;
258 greg 2.3 if (fillsamp == 1)
259     fillo &= ~F_BACK;
260 greg 2.20 if (doavg < 0)
261 greg 2.24 doavg = (argc-an) > 2;
262 schorsch 2.36 if (expcomp != NULL) {
263 schorsch 2.37 if ((expcomp[0] == '+') | (expcomp[0] == '-')) {
264 greg 2.21 expadj = atof(expcomp) + (expcomp[0]=='+' ? .5 : -.5);
265 greg 2.24 if (doavg | doblur)
266 greg 2.21 rexpadj = pow(2.0, atof(expcomp));
267     else
268     rexpadj = pow(2.0, (double)expadj);
269     } else {
270     if (!isflt(expcomp))
271     goto userr;
272     rexpadj = atof(expcomp);
273     expadj = log(rexpadj)/LOG2 + (rexpadj>1 ? .5 : -.5);
274 greg 2.24 if (!(doavg | doblur))
275 greg 2.21 rexpadj = pow(2.0, (double)expadj);
276     }
277 schorsch 2.36 }
278 greg 1.1 /* set view */
279 greg 2.28 if (nextview(doblur ? stdin : (FILE *)NULL) == EOF) {
280 greg 2.24 fprintf(stderr, "%s: no view on standard input!\n",
281     progname);
282 greg 1.1 exit(1);
283     }
284 greg 1.18 normaspect(viewaspect(&ourview), &pixaspect, &hresolu, &vresolu);
285 greg 1.1 /* allocate frame */
286 greg 2.19 if (doavg) {
287     ourspict = (COLOR *)bmalloc(hresolu*vresolu*sizeof(COLOR));
288     ourweigh = (float *)bmalloc(hresolu*vresolu*sizeof(float));
289 schorsch 2.37 if ((ourspict == NULL) | (ourweigh == NULL))
290 greg 2.19 syserror(progname);
291     } else {
292     ourpict = (COLR *)bmalloc(hresolu*vresolu*sizeof(COLR));
293     if (ourpict == NULL)
294     syserror(progname);
295     }
296 greg 2.24 if (doblur) {
297     ourbpict = (COLOR *)bmalloc(hresolu*vresolu*sizeof(COLOR));
298     if (ourbpict == NULL)
299     syserror(progname);
300     }
301 greg 2.7 ourzbuf = (float *)bmalloc(hresolu*vresolu*sizeof(float));
302 greg 2.19 if (ourzbuf == NULL)
303 greg 2.10 syserror(progname);
304 greg 2.13 /* new header */
305     newheader("RADIANCE", stdout);
306 greg 2.33 fputnow(stdout);
307 greg 2.24 /* run pictures */
308     do {
309 schorsch 2.35 memset((char *)ourzbuf, '\0', hresolu*vresolu*sizeof(float));
310 greg 2.24 for (i = an; i < argc; i += 2)
311     addpicture(argv[i], argv[i+1]);
312     if (fillo&F_BACK) /* fill in spaces */
313     backpicture(fillfunc, fillsamp);
314     else
315     fillpicture(fillfunc);
316     /* aft clipping */
317     clipaft();
318     } while (addblur() && nextview(stdin) != EOF);
319 greg 1.13 /* close calculation */
320 greg 1.14 caldone();
321 greg 1.1 /* add to header */
322     printargs(argc, argv, stdout);
323 greg 2.24 compavgview();
324     if (doblur | gotvfile) {
325 greg 1.25 fputs(VIEWSTR, stdout);
326 greg 2.24 fprintview(&avgview, stdout);
327 greg 1.25 putc('\n', stdout);
328 greg 1.1 }
329 schorsch 2.37 if ((pixaspect < .99) | (pixaspect > 1.01))
330 greg 1.18 fputaspect(pixaspect, stdout);
331 greg 2.21 if (ourexp > 0)
332     ourexp *= rexpadj;
333     else
334     ourexp = rexpadj;
335 schorsch 2.37 if ((ourexp < .995) | (ourexp > 1.005))
336 greg 1.16 fputexpos(ourexp, stdout);
337 greg 2.27 if (strcmp(ourfmt, PICFMT)) /* print format if known */
338     fputformat(ourfmt, stdout);
339 greg 1.25 putc('\n', stdout);
340 greg 1.11 /* write picture */
341 greg 1.1 writepicture();
342 greg 1.11 /* write z file */
343     if (zfile != NULL)
344     writedistance(zfile);
345 greg 1.1
346     exit(0);
347 greg 1.10 userr:
348     fprintf(stderr,
349 greg 2.24 "Usage: %s [view opts][-t eps][-z zout][-e spec][-B][-a|-q][-fT][-n] pfile zspec ..\n",
350 greg 1.10 progname);
351     exit(1);
352 greg 1.1 #undef check
353     }
354    
355    
356 schorsch 2.40 static int
357     headline( /* process header string */
358     char *s,
359     void *p
360     )
361 greg 1.1 {
362 greg 2.47 char fmt[MAXFMTLEN];
363 greg 1.1
364 greg 2.13 if (isheadid(s))
365 gwlarson 2.31 return(0);
366 greg 2.13 if (formatval(fmt, s)) {
367 greg 2.27 if (globmatch(ourfmt, fmt)) {
368     wrongformat = 0;
369     strcpy(ourfmt, fmt);
370     } else
371     wrongformat = 1;
372 gwlarson 2.31 return(0);
373 greg 1.33 }
374 greg 2.24 if (nvavg < 2) {
375     putc('\t', stdout);
376     fputs(s, stdout);
377     }
378 greg 1.16 if (isexpos(s)) {
379     theirexp *= exposval(s);
380 gwlarson 2.31 return(0);
381 greg 1.16 }
382 greg 2.5 if (isview(s) && sscanview(&theirview, s) > 0)
383     gotview++;
384 gwlarson 2.31 return(0);
385 greg 1.1 }
386    
387    
388 schorsch 2.41 static int
389     nextview( /* get and set next view */
390     FILE *fp
391     )
392 greg 2.24 {
393     char linebuf[256];
394     char *err;
395 greg 2.44 int i;
396 greg 2.24
397     if (fp != NULL) {
398     do /* get new view */
399     if (fgets(linebuf, sizeof(linebuf), fp) == NULL)
400     return(EOF);
401     while (!isview(linebuf) || !sscanview(&ourview, linebuf));
402     }
403     /* set new view */
404     if ((err = setview(&ourview)) != NULL) {
405     fprintf(stderr, "%s: %s\n", progname, err);
406     exit(1);
407     }
408     if (!nvavg) { /* first view */
409 schorsch 2.36 avgview = ourview;
410 greg 2.24 return(nvavg++);
411     }
412     /* add to average view */
413     for (i = 0; i < 3; i++) {
414     avgview.vp[i] += ourview.vp[i];
415     avgview.vdir[i] += ourview.vdir[i];
416     avgview.vup[i] += ourview.vup[i];
417     }
418 greg 2.42 avgview.vdist += ourview.vdist;
419 greg 2.24 avgview.horiz += ourview.horiz;
420     avgview.vert += ourview.vert;
421     avgview.hoff += ourview.hoff;
422     avgview.voff += ourview.voff;
423     avgview.vfore += ourview.vfore;
424     avgview.vaft += ourview.vaft;
425     return(nvavg++);
426     }
427    
428    
429 schorsch 2.41 static void
430     compavgview(void) /* compute average view */
431 greg 2.24 {
432 greg 2.44 int i;
433 greg 2.24 double f;
434    
435     if (nvavg < 2)
436     return;
437     f = 1.0/nvavg;
438     for (i = 0; i < 3; i++) {
439     avgview.vp[i] *= f;
440     avgview.vdir[i] *= f;
441     avgview.vup[i] *= f;
442     }
443 greg 2.42 avgview.vdist *= f;
444 greg 2.24 avgview.horiz *= f;
445     avgview.vert *= f;
446     avgview.hoff *= f;
447     avgview.voff *= f;
448     avgview.vfore *= f;
449     avgview.vaft *= f;
450     if (setview(&avgview) != NULL) /* in case of emergency... */
451 schorsch 2.36 avgview = ourview;
452 greg 2.24 pixaspect = viewaspect(&avgview) * hresolu / vresolu;
453     }
454    
455    
456 schorsch 2.41 static void
457     addpicture( /* add picture to output */
458     char *pfile,
459     char *zspec
460     )
461 greg 1.1 {
462 greg 1.19 FILE *pfp;
463     int zfd;
464 greg 1.8 char *err;
465 greg 1.1 COLR *scanin;
466 greg 1.15 float *zin;
467     struct position *plast;
468 greg 2.16 struct bound *xlim, ylim;
469 greg 1.1 int y;
470 greg 1.10 /* open picture file */
471 greg 2.10 if ((pfp = fopen(pfile, "r")) == NULL)
472     syserror(pfile);
473 greg 1.16 /* get header with exposure and view */
474     theirexp = 1.0;
475 schorsch 2.36 theirview = stdview;
476 greg 1.16 gotview = 0;
477 greg 2.24 if (nvavg < 2)
478     printf("%s:\n", pfile);
479 greg 1.33 getheader(pfp, headline, NULL);
480 greg 1.34 if (wrongformat || !gotview || !fgetsresolu(&tresolu, pfp)) {
481 greg 1.33 fprintf(stderr, "%s: picture format error\n", pfile);
482 greg 1.1 exit(1);
483     }
484 greg 1.16 if (ourexp <= 0)
485     ourexp = theirexp;
486     else if (ABS(theirexp-ourexp) > .01*ourexp)
487     fprintf(stderr, "%s: different exposure (warning)\n", pfile);
488 schorsch 2.37 if ( (err = setview(&theirview)) ) {
489 greg 1.1 fprintf(stderr, "%s: %s\n", pfile, err);
490     exit(1);
491     }
492 greg 1.5 /* compute transformation */
493 greg 1.30 hasmatrix = pixform(theirs2ours, &theirview, &ourview);
494 greg 2.16 /* get z specification or file */
495 greg 1.34 zin = (float *)malloc(scanlen(&tresolu)*sizeof(float));
496 greg 2.16 if (zin == NULL)
497 greg 2.10 syserror(progname);
498 greg 2.50 if (isflt(zspec)) { /* depth is a constant? */
499     double zvalue = atof(zspec);
500 greg 2.44 int x;
501 greg 2.50 if (zvalue <= 0.0) {
502     fprintf(stderr, "%s: illegal Z-value %s\n",
503     progname, zspec);
504     exit(1);
505     }
506 greg 1.34 for (x = scanlen(&tresolu); x-- > 0; )
507 greg 1.10 zin[x] = zvalue;
508 greg 2.50 zfd = -1;
509     } else if ((zfd = open_float_depth(zspec, (long)tresolu.xr*tresolu.yr)) < 0)
510     exit(1);
511 greg 2.16 /* compute transferrable perimeter */
512     xlim = (struct bound *)malloc(numscans(&tresolu)*sizeof(struct bound));
513     if (xlim == NULL)
514     syserror(progname);
515     if (!getperim(xlim, &ylim, zin, zfd)) { /* overlapping area? */
516 greg 2.33 free((void *)zin);
517     free((void *)xlim);
518 greg 2.16 if (zfd != -1)
519     close(zfd);
520     fclose(pfp);
521     return;
522     }
523     /* allocate scanlines */
524     scanin = (COLR *)malloc(scanlen(&tresolu)*sizeof(COLR));
525     plast = (struct position *)calloc(scanlen(&tresolu),
526     sizeof(struct position));
527 schorsch 2.37 if ((scanin == NULL) | (plast == NULL))
528 greg 2.16 syserror(progname);
529     /* skip to starting point */
530     for (y = 0; y < ylim.min; y++)
531     if (freadcolrs(scanin, scanlen(&tresolu), pfp) < 0) {
532     fprintf(stderr, "%s: read error\n", pfile);
533     exit(1);
534     }
535     if (zfd != -1 && lseek(zfd,
536 greg 2.38 (off_t)ylim.min*scanlen(&tresolu)*sizeof(float),
537     SEEK_SET) < 0)
538 greg 2.16 syserror(zspec);
539 greg 1.1 /* load image */
540 greg 2.16 for (y = ylim.min; y <= ylim.max; y++) {
541 greg 1.34 if (freadcolrs(scanin, scanlen(&tresolu), pfp) < 0) {
542 greg 1.1 fprintf(stderr, "%s: read error\n", pfile);
543     exit(1);
544     }
545 greg 2.16 if (zfd != -1 && read(zfd, (char *)zin,
546 greg 1.34 scanlen(&tresolu)*sizeof(float))
547 greg 2.16 < scanlen(&tresolu)*sizeof(float))
548     syserror(zspec);
549     addscanline(xlim+y, y, scanin, zin, plast);
550 greg 1.1 }
551     /* clean up */
552 greg 2.33 free((void *)xlim);
553     free((void *)scanin);
554     free((void *)zin);
555     free((void *)plast);
556 greg 1.1 fclose(pfp);
557 greg 1.19 if (zfd != -1)
558     close(zfd);
559 greg 1.1 }
560    
561    
562 schorsch 2.41 static int
563     pixform( /* compute view1 to view2 matrix */
564 greg 2.44 MAT4 xfmat,
565     VIEW *vw1,
566     VIEW *vw2
567 schorsch 2.41 )
568 greg 1.5 {
569 greg 2.44 MAT4 m4t;
570 greg 1.5
571 schorsch 2.37 if ((vw1->type != VT_PER) & (vw1->type != VT_PAR))
572 greg 1.30 return(0);
573 schorsch 2.37 if ((vw2->type != VT_PER) & (vw2->type != VT_PAR))
574 greg 1.30 return(0);
575 greg 1.5 setident4(xfmat);
576 greg 1.17 xfmat[0][0] = vw1->hvec[0];
577     xfmat[0][1] = vw1->hvec[1];
578     xfmat[0][2] = vw1->hvec[2];
579     xfmat[1][0] = vw1->vvec[0];
580     xfmat[1][1] = vw1->vvec[1];
581     xfmat[1][2] = vw1->vvec[2];
582 greg 1.5 xfmat[2][0] = vw1->vdir[0];
583     xfmat[2][1] = vw1->vdir[1];
584     xfmat[2][2] = vw1->vdir[2];
585     xfmat[3][0] = vw1->vp[0];
586     xfmat[3][1] = vw1->vp[1];
587     xfmat[3][2] = vw1->vp[2];
588     setident4(m4t);
589 greg 1.17 m4t[0][0] = vw2->hvec[0]/vw2->hn2;
590     m4t[1][0] = vw2->hvec[1]/vw2->hn2;
591     m4t[2][0] = vw2->hvec[2]/vw2->hn2;
592     m4t[3][0] = -DOT(vw2->vp,vw2->hvec)/vw2->hn2;
593     m4t[0][1] = vw2->vvec[0]/vw2->vn2;
594     m4t[1][1] = vw2->vvec[1]/vw2->vn2;
595     m4t[2][1] = vw2->vvec[2]/vw2->vn2;
596     m4t[3][1] = -DOT(vw2->vp,vw2->vvec)/vw2->vn2;
597 greg 1.5 m4t[0][2] = vw2->vdir[0];
598     m4t[1][2] = vw2->vdir[1];
599     m4t[2][2] = vw2->vdir[2];
600     m4t[3][2] = -DOT(vw2->vp,vw2->vdir);
601     multmat4(xfmat, xfmat, m4t);
602 greg 1.30 return(1);
603 greg 1.5 }
604    
605    
606 schorsch 2.41 static void
607     addscanline( /* add scanline to output */
608     struct bound *xl,
609     int y,
610     COLR *pline,
611     float *zline,
612     struct position *lasty /* input/output */
613     )
614 greg 1.1 {
615 greg 1.30 FVECT pos;
616 greg 1.15 struct position lastx, newpos;
617 greg 2.19 double wt;
618 greg 2.44 int x;
619 greg 1.1
620 greg 1.20 lastx.z = 0;
621 greg 2.16 for (x = xl->max; x >= xl->min; x--) {
622 greg 1.34 pix2loc(pos, &tresolu, x, y);
623 greg 1.5 pos[2] = zline[x];
624 greg 2.19 if ((wt = movepixel(pos)) <= FTINY) {
625 greg 1.15 lasty[x].z = lastx.z = 0; /* mark invalid */
626 greg 1.1 continue;
627 greg 1.15 }
628 greg 2.19 /* add pixel to our image */
629 greg 1.17 newpos.x = pos[0] * hresolu;
630     newpos.y = pos[1] * vresolu;
631 greg 1.15 newpos.z = zline[x];
632 greg 2.19 addpixel(&newpos, &lastx, &lasty[x], pline[x], wt, pos[2]);
633     lasty[x].x = lastx.x = newpos.x;
634     lasty[x].y = lastx.y = newpos.y;
635     lasty[x].z = lastx.z = newpos.z;
636 greg 1.1 }
637     }
638    
639    
640 schorsch 2.41 static void
641     addpixel( /* fill in pixel parallelogram */
642     struct position *p0,
643     struct position *p1,
644     struct position *p2,
645     COLR pix,
646     double w,
647     double z
648     )
649 greg 1.8 {
650 greg 1.15 double zt = 2.*zeps*p0->z; /* threshold */
651 greg 2.19 COLOR pval; /* converted+weighted pixel */
652 greg 1.15 int s1x, s1y, s2x, s2y; /* step sizes */
653     int l1, l2, c1, c2; /* side lengths and counters */
654     int p1isy; /* p0p1 along y? */
655     int x1, y1; /* p1 position */
656 greg 2.44 int x, y; /* final position */
657 greg 1.15
658     /* compute vector p0p1 */
659 greg 1.25 if (fillo&F_FORE && ABS(p1->z-p0->z) <= zt) {
660 greg 1.15 s1x = p1->x - p0->x;
661     s1y = p1->y - p0->y;
662     l1 = ABS(s1x);
663 schorsch 2.37 if ( (p1isy = (ABS(s1y) > l1)) )
664 greg 1.15 l1 = ABS(s1y);
665 greg 2.20 else if (l1 < 1)
666 greg 2.19 l1 = 1;
667 greg 1.15 } else {
668     l1 = s1x = s1y = 1;
669     p1isy = -1;
670     }
671     /* compute vector p0p2 */
672 greg 1.25 if (fillo&F_FORE && ABS(p2->z-p0->z) <= zt) {
673 greg 1.15 s2x = p2->x - p0->x;
674     s2y = p2->y - p0->y;
675     if (p1isy == 1)
676     l2 = ABS(s2x);
677     else {
678     l2 = ABS(s2y);
679     if (p1isy != 0 && ABS(s2x) > l2)
680     l2 = ABS(s2x);
681     }
682 greg 2.19 if (l2 < 1)
683     l2 = 1;
684 greg 1.15 } else
685     l2 = s2x = s2y = 1;
686     /* fill the parallelogram */
687 greg 2.19 if (averaging) {
688     colr_color(pval, pix);
689     scalecolor(pval, w);
690     }
691 greg 1.15 for (c1 = l1; c1-- > 0; ) {
692     x1 = p0->x + c1*s1x/l1;
693     y1 = p0->y + c1*s1y/l1;
694     for (c2 = l2; c2-- > 0; ) {
695     x = x1 + c2*s2x/l2;
696 schorsch 2.37 if ((x < 0) | (x >= hresolu))
697 greg 1.28 continue;
698 greg 1.15 y = y1 + c2*s2y/l2;
699 schorsch 2.37 if ((y < 0) | (y >= vresolu))
700 greg 1.28 continue;
701 greg 2.19 if (averaging) {
702     if (zscan(y)[x] <= 0 || zscan(y)[x]-z
703 greg 1.15 > zeps*zscan(y)[x]) {
704 greg 2.19 copycolor(sscan(y)[x], pval);
705     wscan(y)[x] = w;
706     zscan(y)[x] = z;
707     } else if (z-zscan(y)[x] <= zeps*zscan(y)[x]) {
708     addcolor(sscan(y)[x], pval);
709     wscan(y)[x] += w;
710     }
711     } else if (zscan(y)[x] <= 0 || zscan(y)[x]-z
712     > zeps*zscan(y)[x]) {
713     copycolr(pscan(y)[x], pix);
714 greg 1.8 zscan(y)[x] = z;
715     }
716 greg 1.15 }
717     }
718 greg 2.16 }
719    
720    
721 schorsch 2.41 static double
722     movepixel( /* reposition image point */
723 greg 2.44 FVECT pos
724 schorsch 2.41 )
725 greg 2.18 {
726 greg 2.19 FVECT pt, tdir, odir;
727 greg 2.20 double d;
728 greg 2.18
729     if (pos[2] <= 0) /* empty pixel */
730 greg 2.19 return(0);
731 greg 2.22 if (usematrix) {
732 greg 2.18 pos[0] += theirview.hoff - .5;
733     pos[1] += theirview.voff - .5;
734 schorsch 2.37 if (normdist & (theirview.type == VT_PER))
735 greg 2.23 d = sqrt(1. + pos[0]*pos[0]*theirview.hn2
736     + pos[1]*pos[1]*theirview.vn2);
737     else
738     d = 1.;
739     pos[2] += d*theirview.vfore;
740 greg 2.18 if (theirview.type == VT_PER) {
741 greg 2.23 pos[2] /= d;
742 greg 2.18 pos[0] *= pos[2];
743     pos[1] *= pos[2];
744     }
745     multp3(pos, pos, theirs2ours);
746 greg 2.23 if (pos[2] <= ourview.vfore)
747 greg 2.19 return(0);
748 greg 2.18 if (ourview.type == VT_PER) {
749     pos[0] /= pos[2];
750     pos[1] /= pos[2];
751     }
752     pos[0] += .5 - ourview.hoff;
753     pos[1] += .5 - ourview.voff;
754 greg 2.50 if ((pos[0] < 0) | (pos[0] >= 1-FTINY) |
755     (pos[1] < 0) | (pos[1] >= 1-FTINY))
756     return(0);
757 greg 2.23 pos[2] -= ourview.vfore;
758 greg 2.19 } else {
759     if (viewray(pt, tdir, &theirview, pos[0], pos[1]) < -FTINY)
760     return(0);
761 greg 2.50 if (!normdist & (theirview.type == VT_PER)) /* adjust */
762 greg 2.45 pos[2] /= DOT(theirview.vdir, tdir);
763 greg 2.19 pt[0] += tdir[0]*pos[2];
764     pt[1] += tdir[1]*pos[2];
765     pt[2] += tdir[2]*pos[2];
766 greg 2.50 if (viewloc(pos, &ourview, pt) != VL_GOOD)
767 greg 2.19 return(0);
768     }
769     if (!averaging)
770     return(1);
771 gwlarson 2.32 /* compute pixel weight */
772     if (ourview.type == VT_PAR) {
773     d = DOT(ourview.vdir,tdir);
774     d = 1. - d*d;
775     } else {
776     VSUB(odir, pt, ourview.vp);
777     d = DOT(odir,tdir);
778     d = 1. - d*d/DOT(odir,odir);
779     }
780     if (d <= 1./MAXWT/MAXWT)
781 greg 2.19 return(MAXWT); /* clip to maximum weight */
782 gwlarson 2.32 return(1./sqrt(d));
783 greg 2.18 }
784    
785    
786 schorsch 2.41 static int
787     getperim( /* compute overlapping image area */
788 greg 2.44 struct bound *xl,
789 schorsch 2.41 struct bound *yl,
790     float *zline,
791     int zfd
792     )
793 greg 2.16 {
794     int step;
795     FVECT pos;
796 greg 2.44 int x, y;
797 greg 2.16 /* set up step size */
798     if (scanlen(&tresolu) < numscans(&tresolu))
799     step = scanlen(&tresolu)/NSTEPS;
800     else
801     step = numscans(&tresolu)/NSTEPS;
802     if (step < MINSTEP) { /* not worth cropping? */
803     yl->min = 0;
804     yl->max = numscans(&tresolu) - 1;
805     x = scanlen(&tresolu) - 1;
806     for (y = numscans(&tresolu); y--; ) {
807     xl[y].min = 0;
808     xl[y].max = x;
809     }
810     return(1);
811     }
812     yl->min = 32000; yl->max = 0; /* search for points on image */
813     for (y = step - 1; y < numscans(&tresolu); y += step) {
814     if (zfd != -1) {
815 greg 2.33 if (lseek(zfd, (off_t)y*scanlen(&tresolu)*sizeof(float),
816 greg 2.38 SEEK_SET) < 0)
817 greg 2.16 syserror("lseek");
818     if (read(zfd, (char *)zline,
819     scanlen(&tresolu)*sizeof(float))
820     < scanlen(&tresolu)*sizeof(float))
821     syserror("read");
822     }
823     xl[y].min = 32000; xl[y].max = 0; /* x max */
824     for (x = scanlen(&tresolu); (x -= step) > 0; ) {
825     pix2loc(pos, &tresolu, x, y);
826     pos[2] = zline[x];
827 greg 2.19 if (movepixel(pos) > FTINY) {
828 greg 2.16 xl[y].max = x + step - 1;
829     xl[y].min = x - step + 1; /* x min */
830     if (xl[y].min < 0)
831     xl[y].min = 0;
832     for (x = step - 1; x < xl[y].max; x += step) {
833     pix2loc(pos, &tresolu, x, y);
834     pos[2] = zline[x];
835 greg 2.19 if (movepixel(pos) > FTINY) {
836 greg 2.16 xl[y].min = x - step + 1;
837     break;
838     }
839     }
840     if (y < yl->min) /* y limits */
841     yl->min = y - step + 1;
842     yl->max = y + step - 1;
843     break;
844     }
845     }
846     /* fill in between */
847 greg 2.18 if (y < step) {
848 greg 2.16 xl[y-1].min = xl[y].min;
849     xl[y-1].max = xl[y].max;
850 greg 2.18 } else {
851     if (xl[y].min < xl[y-step].min)
852     xl[y-1].min = xl[y].min;
853     else
854     xl[y-1].min = xl[y-step].min;
855     if (xl[y].max > xl[y-step].max)
856     xl[y-1].max = xl[y].max;
857     else
858     xl[y-1].max = xl[y-step].max;
859     }
860 greg 2.16 for (x = 2; x < step; x++)
861 schorsch 2.36 *(xl+y-x) = *(xl+y-1);
862 greg 2.16 }
863     if (yl->max >= numscans(&tresolu))
864     yl->max = numscans(&tresolu) - 1;
865 greg 2.20 y -= step;
866 greg 2.16 for (x = numscans(&tresolu) - 1; x > y; x--) /* fill bottom rows */
867 schorsch 2.36 *(xl+x) = *(xl+y);
868 greg 2.16 return(yl->max >= yl->min);
869 greg 1.8 }
870    
871    
872 schorsch 2.41 static void
873     backpicture( /* background fill algorithm */
874     fillfunc_t *fill,
875     int samp
876     )
877 greg 1.1 {
878 greg 1.2 int *yback, xback;
879 greg 1.1 int y;
880 greg 2.44 int x, i;
881 greg 1.2 /* get back buffer */
882 greg 1.17 yback = (int *)malloc(hresolu*sizeof(int));
883 greg 1.15 if (yback == NULL)
884 greg 2.10 syserror(progname);
885 greg 1.17 for (x = 0; x < hresolu; x++)
886 greg 1.4 yback[x] = -2;
887 greg 1.7 /*
888     * Xback and yback are the pixel locations of suitable
889     * background values in each direction.
890     * A value of -2 means unassigned, and -1 means
891     * that there is no suitable background in this direction.
892     */
893 greg 1.2 /* fill image */
894 greg 1.17 for (y = 0; y < vresolu; y++) {
895 greg 1.4 xback = -2;
896 greg 1.17 for (x = 0; x < hresolu; x++)
897 greg 1.8 if (zscan(y)[x] <= 0) { /* empty pixel */
898 greg 1.7 /*
899     * First, find background from above or below.
900     * (farthest assigned pixel)
901     */
902 greg 1.4 if (yback[x] == -2) {
903 greg 1.17 for (i = y+1; i < vresolu; i++)
904 greg 1.8 if (zscan(i)[x] > 0)
905 greg 1.4 break;
906 greg 1.17 if (i < vresolu
907 greg 1.2 && (y <= 0 || zscan(y-1)[x] < zscan(i)[x]))
908 greg 1.4 yback[x] = i;
909     else
910     yback[x] = y-1;
911 greg 1.2 }
912 greg 1.7 /*
913     * Next, find background from left or right.
914     */
915 greg 1.4 if (xback == -2) {
916 greg 1.17 for (i = x+1; i < hresolu; i++)
917 greg 1.8 if (zscan(y)[i] > 0)
918 greg 1.4 break;
919 greg 1.17 if (i < hresolu
920 greg 1.4 && (x <= 0 || zscan(y)[x-1] < zscan(y)[i]))
921     xback = i;
922     else
923     xback = x-1;
924     }
925 greg 1.7 /*
926 greg 1.26 * If we have no background for this pixel,
927     * use the given fill function.
928 greg 1.11 */
929 greg 1.27 if (xback < 0 && yback[x] < 0)
930     goto fillit;
931 greg 1.11 /*
932 greg 1.7 * Compare, and use the background that is
933     * farther, unless one of them is next to us.
934 greg 1.27 * If the background is too distant, call
935     * the fill function.
936 greg 1.7 */
937 greg 1.11 if ( yback[x] < 0
938     || (xback >= 0 && ABS(x-xback) <= 1)
939 greg 1.4 || ( ABS(y-yback[x]) > 1
940 greg 1.11 && zscan(yback[x])[x]
941 greg 1.13 < zscan(y)[xback] ) ) {
942 greg 1.27 if (samp > 0 && ABS(x-xback) >= samp)
943     goto fillit;
944 greg 2.19 if (averaging) {
945     copycolor(sscan(y)[x],
946     sscan(y)[xback]);
947     wscan(y)[x] = wscan(y)[xback];
948     } else
949     copycolr(pscan(y)[x],
950     pscan(y)[xback]);
951 greg 1.13 zscan(y)[x] = zscan(y)[xback];
952     } else {
953 greg 1.27 if (samp > 0 && ABS(y-yback[x]) > samp)
954     goto fillit;
955 greg 2.19 if (averaging) {
956     copycolor(sscan(y)[x],
957     sscan(yback[x])[x]);
958     wscan(y)[x] =
959     wscan(yback[x])[x];
960     } else
961     copycolr(pscan(y)[x],
962     pscan(yback[x])[x]);
963 greg 1.13 zscan(y)[x] = zscan(yback[x])[x];
964 greg 1.27 }
965     continue;
966     fillit:
967     (*fill)(x,y);
968     if (fill == rcalfill) { /* use it */
969     clearqueue();
970     xback = x;
971     yback[x] = y;
972 greg 1.13 }
973 greg 1.4 } else { /* full pixel */
974     yback[x] = -2;
975     xback = -2;
976     }
977     }
978 greg 2.33 free((void *)yback);
979 greg 1.1 }
980    
981    
982 schorsch 2.41 static void
983     fillpicture( /* paint in empty pixels using fill */
984     fillfunc_t *fill
985     )
986 greg 1.11 {
987 greg 2.44 int x, y;
988 greg 1.11
989 greg 1.17 for (y = 0; y < vresolu; y++)
990     for (x = 0; x < hresolu; x++)
991 greg 1.11 if (zscan(y)[x] <= 0)
992 greg 1.25 (*fill)(x,y);
993 greg 2.26 if (fill == rcalfill)
994     clearqueue();
995 greg 2.15 }
996    
997    
998 schorsch 2.41 static int
999     clipaft(void) /* perform aft clipping as indicated */
1000 greg 2.15 {
1001 greg 2.44 int x, y;
1002 schorsch 2.37 int adjtest = (ourview.type == VT_PER) & zisnorm;
1003 greg 2.15 double tstdist;
1004     double yzn2, vx;
1005    
1006     if (ourview.vaft <= FTINY)
1007 greg 2.24 return(0);
1008 greg 2.17 tstdist = ourview.vaft - ourview.vfore;
1009 greg 2.15 for (y = 0; y < vresolu; y++) {
1010 greg 2.22 if (adjtest) { /* adjust test */
1011 greg 2.15 yzn2 = (y+.5)/vresolu + ourview.voff - .5;
1012     yzn2 = 1. + yzn2*yzn2*ourview.vn2;
1013 greg 2.17 tstdist = (ourview.vaft - ourview.vfore)*sqrt(yzn2);
1014 greg 2.15 }
1015     for (x = 0; x < hresolu; x++)
1016     if (zscan(y)[x] > tstdist) {
1017 greg 2.22 if (adjtest) {
1018 greg 2.15 vx = (x+.5)/hresolu + ourview.hoff - .5;
1019 greg 2.17 if (zscan(y)[x] <= (ourview.vaft -
1020     ourview.vfore) *
1021 greg 2.15 sqrt(vx*vx*ourview.hn2 + yzn2))
1022     continue;
1023     }
1024 greg 2.19 if (averaging)
1025 schorsch 2.35 memset(sscan(y)[x], '\0', sizeof(COLOR));
1026 greg 2.19 else
1027 schorsch 2.35 memset(pscan(y)[x], '\0', sizeof(COLR));
1028 greg 2.15 zscan(y)[x] = 0.0;
1029     }
1030     }
1031 greg 2.24 return(1);
1032 greg 1.11 }
1033    
1034    
1035 schorsch 2.41 static int
1036     addblur(void) /* add to blurred picture */
1037 greg 2.24 {
1038     COLOR cval;
1039     double d;
1040 greg 2.44 int i;
1041 greg 2.24
1042     if (!blurring)
1043     return(0);
1044     i = hresolu*vresolu;
1045     if (nvavg < 2)
1046     if (averaging)
1047     while (i--) {
1048     copycolor(ourbpict[i], ourspict[i]);
1049     d = 1.0/ourweigh[i];
1050     scalecolor(ourbpict[i], d);
1051     }
1052     else
1053     while (i--)
1054     colr_color(ourbpict[i], ourpict[i]);
1055     else
1056     if (averaging)
1057     while (i--) {
1058     copycolor(cval, ourspict[i]);
1059     d = 1.0/ourweigh[i];
1060     scalecolor(cval, d);
1061     addcolor(ourbpict[i], cval);
1062     }
1063     else
1064     while (i--) {
1065     colr_color(cval, ourpict[i]);
1066     addcolor(ourbpict[i], cval);
1067     }
1068     /* print view */
1069     printf("VIEW%d:", nvavg);
1070     fprintview(&ourview, stdout);
1071     putchar('\n');
1072     return(1);
1073     }
1074    
1075    
1076 schorsch 2.41 static void
1077     writepicture(void) /* write out picture (alters buffer) */
1078 greg 1.1 {
1079     int y;
1080 greg 2.44 int x;
1081 greg 2.19 double d;
1082 greg 1.1
1083 greg 1.34 fprtresolu(hresolu, vresolu, stdout);
1084 greg 1.17 for (y = vresolu-1; y >= 0; y--)
1085 greg 2.24 if (blurring) {
1086     for (x = 0; x < hresolu; x++) { /* compute avg. */
1087     d = rexpadj/nvavg;
1088     scalecolor(bscan(y)[x], d);
1089     }
1090     if (fwritescan(bscan(y), hresolu, stdout) < 0)
1091     syserror(progname);
1092     } else if (averaging) {
1093 greg 2.19 for (x = 0; x < hresolu; x++) { /* average pixels */
1094 greg 2.21 d = rexpadj/wscan(y)[x];
1095 greg 2.19 scalecolor(sscan(y)[x], d);
1096     }
1097     if (fwritescan(sscan(y), hresolu, stdout) < 0)
1098     syserror(progname);
1099 greg 2.21 } else {
1100     if (expadj)
1101     shiftcolrs(pscan(y), hresolu, expadj);
1102     if (fwritecolrs(pscan(y), hresolu, stdout) < 0)
1103     syserror(progname);
1104     }
1105 greg 1.11 }
1106    
1107    
1108 schorsch 2.41 static void
1109     writedistance( /* write out z file (alters buffer) */
1110     char *fname
1111     )
1112 greg 1.11 {
1113 greg 2.22 int donorm = normdist & !zisnorm ? 1 :
1114 schorsch 2.37 (ourview.type == VT_PER) & !normdist & zisnorm ? -1 : 0;
1115 greg 1.19 int fd;
1116 greg 1.11 int y;
1117    
1118 greg 2.10 if ((fd = open(fname, O_WRONLY|O_CREAT|O_TRUNC, 0666)) == -1)
1119     syserror(fname);
1120 greg 1.17 for (y = vresolu-1; y >= 0; y--) {
1121 greg 1.11 if (donorm) {
1122 greg 2.22 double vx, yzn2, d;
1123 greg 2.44 int x;
1124 greg 1.29 yzn2 = (y+.5)/vresolu + ourview.voff - .5;
1125 greg 1.17 yzn2 = 1. + yzn2*yzn2*ourview.vn2;
1126     for (x = 0; x < hresolu; x++) {
1127 greg 1.29 vx = (x+.5)/hresolu + ourview.hoff - .5;
1128 greg 2.22 d = sqrt(vx*vx*ourview.hn2 + yzn2);
1129     if (donorm > 0)
1130     zscan(y)[x] *= d;
1131     else
1132     zscan(y)[x] /= d;
1133 greg 1.11 }
1134 greg 2.22 }
1135     if (write(fd, (char *)zscan(y), hresolu*sizeof(float))
1136 greg 2.10 < hresolu*sizeof(float))
1137     syserror(fname);
1138 greg 1.11 }
1139 greg 1.19 close(fd);
1140 greg 1.10 }
1141    
1142    
1143 schorsch 2.41 static void
1144     backfill( /* fill pixel with background */
1145     int x,
1146     int y
1147     )
1148 greg 1.12 {
1149 greg 2.19 if (averaging) {
1150     copycolor(sscan(y)[x], backcolor);
1151     wscan(y)[x] = 1;
1152     } else
1153     copycolr(pscan(y)[x], backcolr);
1154 greg 1.13 zscan(y)[x] = backz;
1155     }
1156    
1157    
1158 schorsch 2.41 static void
1159     calstart( /* start fill calculation */
1160     char *prog,
1161     char *args
1162     )
1163 greg 1.13 {
1164     char combuf[512];
1165 greg 2.3 char *argv[64];
1166     int rval;
1167 greg 2.44 char **wp, *cp;
1168 greg 1.13
1169 greg 2.49 if (PDesc.flags & PF_RUNNING) {
1170 greg 1.14 fprintf(stderr, "%s: too many calculations\n", progname);
1171     exit(1);
1172     }
1173 greg 2.3 strcpy(combuf, prog);
1174     strcat(combuf, args);
1175     cp = combuf;
1176     wp = argv;
1177     for ( ; ; ) {
1178 greg 2.11 while (isspace(*cp)) /* nullify spaces */
1179     *cp++ = '\0';
1180     if (!*cp) /* all done? */
1181     break;
1182     *wp++ = cp; /* add argument to list */
1183     while (*++cp && !isspace(*cp))
1184     ;
1185 greg 2.3 }
1186     *wp = NULL;
1187     /* start process */
1188 schorsch 2.34 if ((rval = open_process(&PDesc, argv)) < 0)
1189 greg 2.10 syserror(progname);
1190 greg 2.3 if (rval == 0) {
1191     fprintf(stderr, "%s: command not found\n", argv[0]);
1192     exit(1);
1193 greg 1.13 }
1194 greg 2.3 packsiz = rval/(6*sizeof(float)) - 1;
1195     if (packsiz > PACKSIZ)
1196     packsiz = PACKSIZ;
1197 greg 1.13 queuesiz = 0;
1198     }
1199    
1200    
1201 schorsch 2.41 static void
1202     caldone(void) /* done with calculation */
1203 greg 1.13 {
1204 greg 2.49 if (!(PDesc.flags & PF_RUNNING))
1205 greg 1.14 return;
1206 greg 1.25 clearqueue();
1207 schorsch 2.34 close_process(&PDesc);
1208 greg 1.13 }
1209    
1210    
1211 schorsch 2.41 static void
1212     rcalfill( /* fill with ray-calculated pixel */
1213     int x,
1214     int y
1215     )
1216 greg 1.13 {
1217 greg 2.3 if (queuesiz >= packsiz) /* flush queue if needed */
1218 greg 1.25 clearqueue();
1219 greg 1.22 /* add position to queue */
1220 greg 1.13 queue[queuesiz][0] = x;
1221     queue[queuesiz][1] = y;
1222     queuesiz++;
1223     }
1224    
1225    
1226 schorsch 2.41 static void
1227     clearqueue(void) /* process queue */
1228 greg 1.13 {
1229 greg 1.22 FVECT orig, dir;
1230 greg 2.3 float fbuf[6*(PACKSIZ+1)];
1231 greg 2.44 float *fbp;
1232     int i;
1233 greg 2.22 double vx, vy;
1234 greg 1.13
1235 greg 2.10 if (queuesiz == 0)
1236     return;
1237 greg 2.3 fbp = fbuf;
1238 greg 1.13 for (i = 0; i < queuesiz; i++) {
1239 greg 1.22 viewray(orig, dir, &ourview,
1240     (queue[i][0]+.5)/hresolu,
1241     (queue[i][1]+.5)/vresolu);
1242 greg 2.3 *fbp++ = orig[0]; *fbp++ = orig[1]; *fbp++ = orig[2];
1243     *fbp++ = dir[0]; *fbp++ = dir[1]; *fbp++ = dir[2];
1244 greg 1.22 }
1245 greg 2.3 /* mark end and get results */
1246 schorsch 2.35 memset((char *)fbp, '\0', 6*sizeof(float));
1247 greg 2.52 if (process(&PDesc, fbuf, fbuf,
1248 greg 2.33 4*sizeof(float)*(queuesiz+1),
1249 greg 2.3 6*sizeof(float)*(queuesiz+1)) !=
1250 gregl 2.29 4*sizeof(float)*(queuesiz+1)) {
1251 greg 2.3 fprintf(stderr, "%s: error reading from rtrace process\n",
1252     progname);
1253     exit(1);
1254     }
1255     fbp = fbuf;
1256 greg 1.22 for (i = 0; i < queuesiz; i++) {
1257 greg 1.16 if (ourexp > 0 && ourexp != 1.0) {
1258 greg 2.3 fbp[0] *= ourexp;
1259     fbp[1] *= ourexp;
1260     fbp[2] *= ourexp;
1261 greg 1.14 }
1262 greg 2.19 if (averaging) {
1263     setcolor(sscan(queue[i][1])[queue[i][0]],
1264     fbp[0], fbp[1], fbp[2]);
1265 greg 2.26 wscan(queue[i][1])[queue[i][0]] = 1;
1266 greg 2.19 } else
1267     setcolr(pscan(queue[i][1])[queue[i][0]],
1268     fbp[0], fbp[1], fbp[2]);
1269 greg 2.22 if (zisnorm)
1270     zscan(queue[i][1])[queue[i][0]] = fbp[3];
1271     else {
1272     vx = (queue[i][0]+.5)/hresolu + ourview.hoff - .5;
1273     vy = (queue[i][1]+.5)/vresolu + ourview.voff - .5;
1274     zscan(queue[i][1])[queue[i][0]] = fbp[3] / sqrt(1. +
1275     vx*vx*ourview.hn2 + vy*vy*ourview.vn2);
1276     }
1277 greg 2.3 fbp += 4;
1278 greg 1.13 }
1279     queuesiz = 0;
1280 greg 1.14 }
1281    
1282    
1283 schorsch 2.41 static void
1284     syserror( /* report error and exit */
1285     char *s
1286     )
1287 greg 1.14 {
1288 greg 2.10 perror(s);
1289 greg 1.14 exit(1);
1290 greg 1.1 }