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root/radiance/ray/src/px/pinterp.c
Revision: 2.42
Committed: Tue Jan 18 03:59:41 2005 UTC (19 years, 3 months ago) by greg
Content type: text/plain
Branch: MAIN
CVS Tags: rad3R7P2, rad3R7P1, rad4R1, rad4R0, rad3R8, rad3R9
Changes since 2.41: +3 -1 lines
Log Message: 
Created pmdblur script and added DBLUR variable to ranimate

File Contents

# User Rev Content
1 greg 1.1 #ifndef lint
2 greg 2.42 static const char RCSid[] = "$Id: pinterp.c,v 2.41 2004/03/28 20:33:14 schorsch Exp $";
3 greg 1.1 #endif
4     /*
5     * Interpolate and extrapolate pictures with different view parameters.
6     *
7     * Greg Ward 09Dec89
8     */
9    
10 schorsch 2.34 #include "copyright.h"
11 greg 1.1
12 greg 2.3 #include <ctype.h>
13 schorsch 2.35 #include <string.h>
14 greg 2.3
15 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 1.11 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     progname = argv[0];
138    
139 greg 2.24 for (an = 1; an < argc && argv[an][0] == '-'; an++) {
140     rval = getviewopt(&ourview, argc-an, argv+an);
141 greg 1.17 if (rval >= 0) {
142 greg 2.24 an += rval;
143 greg 1.17 continue;
144     }
145 greg 2.24 switch (argv[an][1]) {
146 greg 2.21 case 'e': /* exposure */
147     check(2,"f");
148 greg 2.24 expcomp = argv[++an];
149 greg 2.21 break;
150 greg 1.1 case 't': /* threshold */
151 greg 2.3 check(2,"f");
152 greg 2.24 zeps = atof(argv[++an]);
153 greg 1.1 break;
154 greg 2.19 case 'a': /* average */
155     check(2,NULL);
156     doavg = 1;
157     break;
158 greg 2.24 case 'B': /* blur views */
159     check(2,NULL);
160     doblur = 1;
161     break;
162 greg 2.19 case 'q': /* quick (no avg.) */
163     check(2,NULL);
164     doavg = 0;
165     break;
166 greg 1.11 case 'n': /* dist. normalized? */
167 greg 2.3 check(2,NULL);
168 greg 1.11 normdist = !normdist;
169 greg 1.10 break;
170 greg 1.11 case 'f': /* fill type */
171 greg 2.24 switch (argv[an][2]) {
172 greg 1.11 case '0': /* none */
173 greg 2.3 check(3,NULL);
174 greg 1.25 fillo = 0;
175 greg 1.11 break;
176     case 'f': /* foreground */
177 greg 2.3 check(3,NULL);
178 greg 1.25 fillo = F_FORE;
179 greg 1.11 break;
180     case 'b': /* background */
181 greg 2.3 check(3,NULL);
182 greg 1.25 fillo = F_BACK;
183 greg 1.11 break;
184     case 'a': /* all */
185 greg 2.3 check(3,NULL);
186 greg 1.25 fillo = F_FORE|F_BACK;
187 greg 1.11 break;
188 greg 1.25 case 's': /* sample */
189 greg 2.3 check(3,"i");
190 greg 2.24 fillsamp = atoi(argv[++an]);
191 greg 1.25 break;
192 greg 1.11 case 'c': /* color */
193 greg 2.3 check(3,"fff");
194 greg 1.25 fillfunc = backfill;
195 greg 2.24 setcolor(backcolor, atof(argv[an+1]),
196     atof(argv[an+2]), atof(argv[an+3]));
197 greg 2.19 setcolr(backcolr, colval(backcolor,RED),
198     colval(backcolor,GRN),
199     colval(backcolor,BLU));
200 greg 2.24 an += 3;
201 greg 1.11 break;
202 greg 1.13 case 'z': /* z value */
203 greg 2.3 check(3,"f");
204 greg 1.25 fillfunc = backfill;
205 greg 2.24 backz = atof(argv[++an]);
206 greg 1.13 break;
207     case 'r': /* rtrace */
208 greg 2.3 check(3,"s");
209 greg 1.25 fillfunc = rcalfill;
210 greg 2.24 calstart(RTCOM, argv[++an]);
211 greg 1.13 break;
212 greg 1.11 default:
213     goto badopt;
214     }
215     break;
216     case 'z': /* z file */
217 greg 2.3 check(2,"s");
218 greg 2.24 zfile = argv[++an];
219 greg 1.11 break;
220 greg 1.6 case 'x': /* x resolution */
221 greg 2.3 check(2,"i");
222 greg 2.24 hresolu = atoi(argv[++an]);
223 greg 1.6 break;
224     case 'y': /* y resolution */
225 greg 2.3 check(2,"i");
226 greg 2.24 vresolu = atoi(argv[++an]);
227 greg 1.6 break;
228 greg 1.18 case 'p': /* pixel aspect */
229 greg 2.24 if (argv[an][2] != 'a')
230 greg 2.6 goto badopt;
231     check(3,"f");
232 greg 2.24 pixaspect = atof(argv[++an]);
233 greg 1.18 break;
234 greg 1.17 case 'v': /* view file */
235 greg 2.24 if (argv[an][2] != 'f')
236 greg 1.1 goto badopt;
237 greg 2.3 check(3,"s");
238 greg 2.33 gotvfile = viewfile(argv[++an], &ourview, NULL);
239 greg 2.10 if (gotvfile < 0)
240 greg 2.24 syserror(argv[an]);
241 greg 2.10 else if (gotvfile == 0) {
242 greg 1.17 fprintf(stderr, "%s: bad view file\n",
243 greg 2.24 argv[an]);
244 greg 1.17 exit(1);
245 greg 1.1 }
246     break;
247     default:
248     badopt:
249 greg 1.10 fprintf(stderr, "%s: command line error at '%s'\n",
250 greg 2.24 progname, argv[an]);
251 greg 1.10 goto userr;
252 greg 1.1 }
253 greg 1.17 }
254 greg 1.1 /* check arguments */
255 greg 2.24 if ((argc-an)%2)
256 greg 1.10 goto userr;
257 greg 2.3 if (fillsamp == 1)
258     fillo &= ~F_BACK;
259 greg 2.20 if (doavg < 0)
260 greg 2.24 doavg = (argc-an) > 2;
261 schorsch 2.36 if (expcomp != NULL) {
262 schorsch 2.37 if ((expcomp[0] == '+') | (expcomp[0] == '-')) {
263 greg 2.21 expadj = atof(expcomp) + (expcomp[0]=='+' ? .5 : -.5);
264 greg 2.24 if (doavg | doblur)
265 greg 2.21 rexpadj = pow(2.0, atof(expcomp));
266     else
267     rexpadj = pow(2.0, (double)expadj);
268     } else {
269     if (!isflt(expcomp))
270     goto userr;
271     rexpadj = atof(expcomp);
272     expadj = log(rexpadj)/LOG2 + (rexpadj>1 ? .5 : -.5);
273 greg 2.24 if (!(doavg | doblur))
274 greg 2.21 rexpadj = pow(2.0, (double)expadj);
275     }
276 schorsch 2.36 }
277 greg 1.1 /* set view */
278 greg 2.28 if (nextview(doblur ? stdin : (FILE *)NULL) == EOF) {
279 greg 2.24 fprintf(stderr, "%s: no view on standard input!\n",
280     progname);
281 greg 1.1 exit(1);
282     }
283 greg 1.18 normaspect(viewaspect(&ourview), &pixaspect, &hresolu, &vresolu);
284 greg 1.1 /* allocate frame */
285 greg 2.19 if (doavg) {
286     ourspict = (COLOR *)bmalloc(hresolu*vresolu*sizeof(COLOR));
287     ourweigh = (float *)bmalloc(hresolu*vresolu*sizeof(float));
288 schorsch 2.37 if ((ourspict == NULL) | (ourweigh == NULL))
289 greg 2.19 syserror(progname);
290     } else {
291     ourpict = (COLR *)bmalloc(hresolu*vresolu*sizeof(COLR));
292     if (ourpict == NULL)
293     syserror(progname);
294     }
295 greg 2.24 if (doblur) {
296     ourbpict = (COLOR *)bmalloc(hresolu*vresolu*sizeof(COLOR));
297     if (ourbpict == NULL)
298     syserror(progname);
299     }
300 greg 2.7 ourzbuf = (float *)bmalloc(hresolu*vresolu*sizeof(float));
301 greg 2.19 if (ourzbuf == NULL)
302 greg 2.10 syserror(progname);
303 greg 2.13 /* new header */
304     newheader("RADIANCE", stdout);
305 greg 2.33 fputnow(stdout);
306 greg 2.24 /* run pictures */
307     do {
308 schorsch 2.35 memset((char *)ourzbuf, '\0', hresolu*vresolu*sizeof(float));
309 greg 2.24 for (i = an; i < argc; i += 2)
310     addpicture(argv[i], argv[i+1]);
311     if (fillo&F_BACK) /* fill in spaces */
312     backpicture(fillfunc, fillsamp);
313     else
314     fillpicture(fillfunc);
315     /* aft clipping */
316     clipaft();
317     } while (addblur() && nextview(stdin) != EOF);
318 greg 1.13 /* close calculation */
319 greg 1.14 caldone();
320 greg 1.1 /* add to header */
321     printargs(argc, argv, stdout);
322 greg 2.24 compavgview();
323     if (doblur | gotvfile) {
324 greg 1.25 fputs(VIEWSTR, stdout);
325 greg 2.24 fprintview(&avgview, stdout);
326 greg 1.25 putc('\n', stdout);
327 greg 1.1 }
328 schorsch 2.37 if ((pixaspect < .99) | (pixaspect > 1.01))
329 greg 1.18 fputaspect(pixaspect, stdout);
330 greg 2.21 if (ourexp > 0)
331     ourexp *= rexpadj;
332     else
333     ourexp = rexpadj;
334 schorsch 2.37 if ((ourexp < .995) | (ourexp > 1.005))
335 greg 1.16 fputexpos(ourexp, stdout);
336 greg 2.27 if (strcmp(ourfmt, PICFMT)) /* print format if known */
337     fputformat(ourfmt, stdout);
338 greg 1.25 putc('\n', stdout);
339 greg 1.11 /* write picture */
340 greg 1.1 writepicture();
341 greg 1.11 /* write z file */
342     if (zfile != NULL)
343     writedistance(zfile);
344 greg 1.1
345     exit(0);
346 greg 1.10 userr:
347     fprintf(stderr,
348 greg 2.24 "Usage: %s [view opts][-t eps][-z zout][-e spec][-B][-a|-q][-fT][-n] pfile zspec ..\n",
349 greg 1.10 progname);
350     exit(1);
351 greg 1.1 #undef check
352     }
353    
354    
355 schorsch 2.40 static int
356     headline( /* process header string */
357     char *s,
358     void *p
359     )
360 greg 1.1 {
361 greg 1.33 char fmt[32];
362 greg 1.1
363 greg 2.13 if (isheadid(s))
364 gwlarson 2.31 return(0);
365 greg 2.13 if (formatval(fmt, s)) {
366 greg 2.27 if (globmatch(ourfmt, fmt)) {
367     wrongformat = 0;
368     strcpy(ourfmt, fmt);
369     } else
370     wrongformat = 1;
371 gwlarson 2.31 return(0);
372 greg 1.33 }
373 greg 2.24 if (nvavg < 2) {
374     putc('\t', stdout);
375     fputs(s, stdout);
376     }
377 greg 1.16 if (isexpos(s)) {
378     theirexp *= exposval(s);
379 gwlarson 2.31 return(0);
380 greg 1.16 }
381 greg 2.5 if (isview(s) && sscanview(&theirview, s) > 0)
382     gotview++;
383 gwlarson 2.31 return(0);
384 greg 1.1 }
385    
386    
387 schorsch 2.41 static int
388     nextview( /* get and set next view */
389     FILE *fp
390     )
391 greg 2.24 {
392     char linebuf[256];
393     char *err;
394     register int i;
395    
396     if (fp != NULL) {
397     do /* get new view */
398     if (fgets(linebuf, sizeof(linebuf), fp) == NULL)
399     return(EOF);
400     while (!isview(linebuf) || !sscanview(&ourview, linebuf));
401     }
402     /* set new view */
403     if ((err = setview(&ourview)) != NULL) {
404     fprintf(stderr, "%s: %s\n", progname, err);
405     exit(1);
406     }
407     if (!nvavg) { /* first view */
408 schorsch 2.36 avgview = ourview;
409 greg 2.24 return(nvavg++);
410     }
411     /* add to average view */
412     for (i = 0; i < 3; i++) {
413     avgview.vp[i] += ourview.vp[i];
414     avgview.vdir[i] += ourview.vdir[i];
415     avgview.vup[i] += ourview.vup[i];
416     }
417 greg 2.42 avgview.vdist += ourview.vdist;
418 greg 2.24 avgview.horiz += ourview.horiz;
419     avgview.vert += ourview.vert;
420     avgview.hoff += ourview.hoff;
421     avgview.voff += ourview.voff;
422     avgview.vfore += ourview.vfore;
423     avgview.vaft += ourview.vaft;
424     return(nvavg++);
425     }
426    
427    
428 schorsch 2.41 static void
429     compavgview(void) /* compute average view */
430 greg 2.24 {
431     register int i;
432     double f;
433    
434     if (nvavg < 2)
435     return;
436     f = 1.0/nvavg;
437     for (i = 0; i < 3; i++) {
438     avgview.vp[i] *= f;
439     avgview.vdir[i] *= f;
440     avgview.vup[i] *= f;
441     }
442 greg 2.42 avgview.vdist *= f;
443 greg 2.24 avgview.horiz *= f;
444     avgview.vert *= f;
445     avgview.hoff *= f;
446     avgview.voff *= f;
447     avgview.vfore *= f;
448     avgview.vaft *= f;
449     if (setview(&avgview) != NULL) /* in case of emergency... */
450 schorsch 2.36 avgview = ourview;
451 greg 2.24 pixaspect = viewaspect(&avgview) * hresolu / vresolu;
452     }
453    
454    
455 schorsch 2.41 static void
456     addpicture( /* add picture to output */
457     char *pfile,
458     char *zspec
459     )
460 greg 1.1 {
461 greg 1.19 FILE *pfp;
462     int zfd;
463 greg 1.8 char *err;
464 greg 1.1 COLR *scanin;
465 greg 1.15 float *zin;
466     struct position *plast;
467 greg 2.16 struct bound *xlim, ylim;
468 greg 1.1 int y;
469 greg 1.10 /* open picture file */
470 greg 2.10 if ((pfp = fopen(pfile, "r")) == NULL)
471     syserror(pfile);
472 greg 1.16 /* get header with exposure and view */
473     theirexp = 1.0;
474 schorsch 2.36 theirview = stdview;
475 greg 1.16 gotview = 0;
476 greg 2.24 if (nvavg < 2)
477     printf("%s:\n", pfile);
478 greg 1.33 getheader(pfp, headline, NULL);
479 greg 1.34 if (wrongformat || !gotview || !fgetsresolu(&tresolu, pfp)) {
480 greg 1.33 fprintf(stderr, "%s: picture format error\n", pfile);
481 greg 1.1 exit(1);
482     }
483 greg 1.16 if (ourexp <= 0)
484     ourexp = theirexp;
485     else if (ABS(theirexp-ourexp) > .01*ourexp)
486     fprintf(stderr, "%s: different exposure (warning)\n", pfile);
487 schorsch 2.37 if ( (err = setview(&theirview)) ) {
488 greg 1.1 fprintf(stderr, "%s: %s\n", pfile, err);
489     exit(1);
490     }
491 greg 1.5 /* compute transformation */
492 greg 1.30 hasmatrix = pixform(theirs2ours, &theirview, &ourview);
493 greg 2.16 /* get z specification or file */
494 greg 1.34 zin = (float *)malloc(scanlen(&tresolu)*sizeof(float));
495 greg 2.16 if (zin == NULL)
496 greg 2.10 syserror(progname);
497 greg 1.19 if ((zfd = open(zspec, O_RDONLY)) == -1) {
498 greg 1.10 double zvalue;
499     register int x;
500 greg 2.19 if (!isflt(zspec) || (zvalue = atof(zspec)) <= 0.0)
501 greg 2.10 syserror(zspec);
502 greg 1.34 for (x = scanlen(&tresolu); x-- > 0; )
503 greg 1.10 zin[x] = zvalue;
504     }
505 greg 2.16 /* compute transferrable perimeter */
506     xlim = (struct bound *)malloc(numscans(&tresolu)*sizeof(struct bound));
507     if (xlim == NULL)
508     syserror(progname);
509     if (!getperim(xlim, &ylim, zin, zfd)) { /* overlapping area? */
510 greg 2.33 free((void *)zin);
511     free((void *)xlim);
512 greg 2.16 if (zfd != -1)
513     close(zfd);
514     fclose(pfp);
515     return;
516     }
517     /* allocate scanlines */
518     scanin = (COLR *)malloc(scanlen(&tresolu)*sizeof(COLR));
519     plast = (struct position *)calloc(scanlen(&tresolu),
520     sizeof(struct position));
521 schorsch 2.37 if ((scanin == NULL) | (plast == NULL))
522 greg 2.16 syserror(progname);
523     /* skip to starting point */
524     for (y = 0; y < ylim.min; y++)
525     if (freadcolrs(scanin, scanlen(&tresolu), pfp) < 0) {
526     fprintf(stderr, "%s: read error\n", pfile);
527     exit(1);
528     }
529     if (zfd != -1 && lseek(zfd,
530 greg 2.38 (off_t)ylim.min*scanlen(&tresolu)*sizeof(float),
531     SEEK_SET) < 0)
532 greg 2.16 syserror(zspec);
533 greg 1.1 /* load image */
534 greg 2.16 for (y = ylim.min; y <= ylim.max; y++) {
535 greg 1.34 if (freadcolrs(scanin, scanlen(&tresolu), pfp) < 0) {
536 greg 1.1 fprintf(stderr, "%s: read error\n", pfile);
537     exit(1);
538     }
539 greg 2.16 if (zfd != -1 && read(zfd, (char *)zin,
540 greg 1.34 scanlen(&tresolu)*sizeof(float))
541 greg 2.16 < scanlen(&tresolu)*sizeof(float))
542     syserror(zspec);
543     addscanline(xlim+y, y, scanin, zin, plast);
544 greg 1.1 }
545     /* clean up */
546 greg 2.33 free((void *)xlim);
547     free((void *)scanin);
548     free((void *)zin);
549     free((void *)plast);
550 greg 1.1 fclose(pfp);
551 greg 1.19 if (zfd != -1)
552     close(zfd);
553 greg 1.1 }
554    
555    
556 schorsch 2.41 static int
557     pixform( /* compute view1 to view2 matrix */
558     register MAT4 xfmat,
559     register VIEW *vw1,
560     register VIEW *vw2
561     )
562 greg 1.5 {
563     double m4t[4][4];
564    
565 schorsch 2.37 if ((vw1->type != VT_PER) & (vw1->type != VT_PAR))
566 greg 1.30 return(0);
567 schorsch 2.37 if ((vw2->type != VT_PER) & (vw2->type != VT_PAR))
568 greg 1.30 return(0);
569 greg 1.5 setident4(xfmat);
570 greg 1.17 xfmat[0][0] = vw1->hvec[0];
571     xfmat[0][1] = vw1->hvec[1];
572     xfmat[0][2] = vw1->hvec[2];
573     xfmat[1][0] = vw1->vvec[0];
574     xfmat[1][1] = vw1->vvec[1];
575     xfmat[1][2] = vw1->vvec[2];
576 greg 1.5 xfmat[2][0] = vw1->vdir[0];
577     xfmat[2][1] = vw1->vdir[1];
578     xfmat[2][2] = vw1->vdir[2];
579     xfmat[3][0] = vw1->vp[0];
580     xfmat[3][1] = vw1->vp[1];
581     xfmat[3][2] = vw1->vp[2];
582     setident4(m4t);
583 greg 1.17 m4t[0][0] = vw2->hvec[0]/vw2->hn2;
584     m4t[1][0] = vw2->hvec[1]/vw2->hn2;
585     m4t[2][0] = vw2->hvec[2]/vw2->hn2;
586     m4t[3][0] = -DOT(vw2->vp,vw2->hvec)/vw2->hn2;
587     m4t[0][1] = vw2->vvec[0]/vw2->vn2;
588     m4t[1][1] = vw2->vvec[1]/vw2->vn2;
589     m4t[2][1] = vw2->vvec[2]/vw2->vn2;
590     m4t[3][1] = -DOT(vw2->vp,vw2->vvec)/vw2->vn2;
591 greg 1.5 m4t[0][2] = vw2->vdir[0];
592     m4t[1][2] = vw2->vdir[1];
593     m4t[2][2] = vw2->vdir[2];
594     m4t[3][2] = -DOT(vw2->vp,vw2->vdir);
595     multmat4(xfmat, xfmat, m4t);
596 greg 1.30 return(1);
597 greg 1.5 }
598    
599    
600 schorsch 2.41 static void
601     addscanline( /* add scanline to output */
602     struct bound *xl,
603     int y,
604     COLR *pline,
605     float *zline,
606     struct position *lasty /* input/output */
607     )
608 greg 1.1 {
609 greg 1.30 FVECT pos;
610 greg 1.15 struct position lastx, newpos;
611 greg 2.19 double wt;
612 greg 1.1 register int x;
613    
614 greg 1.20 lastx.z = 0;
615 greg 2.16 for (x = xl->max; x >= xl->min; x--) {
616 greg 1.34 pix2loc(pos, &tresolu, x, y);
617 greg 1.5 pos[2] = zline[x];
618 greg 2.19 if ((wt = movepixel(pos)) <= FTINY) {
619 greg 1.15 lasty[x].z = lastx.z = 0; /* mark invalid */
620 greg 1.1 continue;
621 greg 1.15 }
622 greg 2.19 /* add pixel to our image */
623 greg 1.17 newpos.x = pos[0] * hresolu;
624     newpos.y = pos[1] * vresolu;
625 greg 1.15 newpos.z = zline[x];
626 greg 2.19 addpixel(&newpos, &lastx, &lasty[x], pline[x], wt, pos[2]);
627     lasty[x].x = lastx.x = newpos.x;
628     lasty[x].y = lastx.y = newpos.y;
629     lasty[x].z = lastx.z = newpos.z;
630 greg 1.1 }
631     }
632    
633    
634 schorsch 2.41 static void
635     addpixel( /* fill in pixel parallelogram */
636     struct position *p0,
637     struct position *p1,
638     struct position *p2,
639     COLR pix,
640     double w,
641     double z
642     )
643 greg 1.8 {
644 greg 1.15 double zt = 2.*zeps*p0->z; /* threshold */
645 greg 2.19 COLOR pval; /* converted+weighted pixel */
646 greg 1.15 int s1x, s1y, s2x, s2y; /* step sizes */
647     int l1, l2, c1, c2; /* side lengths and counters */
648     int p1isy; /* p0p1 along y? */
649     int x1, y1; /* p1 position */
650     register int x, y; /* final position */
651    
652     /* compute vector p0p1 */
653 greg 1.25 if (fillo&F_FORE && ABS(p1->z-p0->z) <= zt) {
654 greg 1.15 s1x = p1->x - p0->x;
655     s1y = p1->y - p0->y;
656     l1 = ABS(s1x);
657 schorsch 2.37 if ( (p1isy = (ABS(s1y) > l1)) )
658 greg 1.15 l1 = ABS(s1y);
659 greg 2.20 else if (l1 < 1)
660 greg 2.19 l1 = 1;
661 greg 1.15 } else {
662     l1 = s1x = s1y = 1;
663     p1isy = -1;
664     }
665     /* compute vector p0p2 */
666 greg 1.25 if (fillo&F_FORE && ABS(p2->z-p0->z) <= zt) {
667 greg 1.15 s2x = p2->x - p0->x;
668     s2y = p2->y - p0->y;
669     if (p1isy == 1)
670     l2 = ABS(s2x);
671     else {
672     l2 = ABS(s2y);
673     if (p1isy != 0 && ABS(s2x) > l2)
674     l2 = ABS(s2x);
675     }
676 greg 2.19 if (l2 < 1)
677     l2 = 1;
678 greg 1.15 } else
679     l2 = s2x = s2y = 1;
680     /* fill the parallelogram */
681 greg 2.19 if (averaging) {
682     colr_color(pval, pix);
683     scalecolor(pval, w);
684     }
685 greg 1.15 for (c1 = l1; c1-- > 0; ) {
686     x1 = p0->x + c1*s1x/l1;
687     y1 = p0->y + c1*s1y/l1;
688     for (c2 = l2; c2-- > 0; ) {
689     x = x1 + c2*s2x/l2;
690 schorsch 2.37 if ((x < 0) | (x >= hresolu))
691 greg 1.28 continue;
692 greg 1.15 y = y1 + c2*s2y/l2;
693 schorsch 2.37 if ((y < 0) | (y >= vresolu))
694 greg 1.28 continue;
695 greg 2.19 if (averaging) {
696     if (zscan(y)[x] <= 0 || zscan(y)[x]-z
697 greg 1.15 > zeps*zscan(y)[x]) {
698 greg 2.19 copycolor(sscan(y)[x], pval);
699     wscan(y)[x] = w;
700     zscan(y)[x] = z;
701     } else if (z-zscan(y)[x] <= zeps*zscan(y)[x]) {
702     addcolor(sscan(y)[x], pval);
703     wscan(y)[x] += w;
704     }
705     } else if (zscan(y)[x] <= 0 || zscan(y)[x]-z
706     > zeps*zscan(y)[x]) {
707     copycolr(pscan(y)[x], pix);
708 greg 1.8 zscan(y)[x] = z;
709     }
710 greg 1.15 }
711     }
712 greg 2.16 }
713    
714    
715 schorsch 2.41 static double
716     movepixel( /* reposition image point */
717     register FVECT pos
718     )
719 greg 2.18 {
720 greg 2.19 FVECT pt, tdir, odir;
721 greg 2.20 double d;
722 greg 2.18
723     if (pos[2] <= 0) /* empty pixel */
724 greg 2.19 return(0);
725 greg 2.22 if (usematrix) {
726 greg 2.18 pos[0] += theirview.hoff - .5;
727     pos[1] += theirview.voff - .5;
728 schorsch 2.37 if (normdist & (theirview.type == VT_PER))
729 greg 2.23 d = sqrt(1. + pos[0]*pos[0]*theirview.hn2
730     + pos[1]*pos[1]*theirview.vn2);
731     else
732     d = 1.;
733     pos[2] += d*theirview.vfore;
734 greg 2.18 if (theirview.type == VT_PER) {
735 greg 2.23 pos[2] /= d;
736 greg 2.18 pos[0] *= pos[2];
737     pos[1] *= pos[2];
738     }
739     multp3(pos, pos, theirs2ours);
740 greg 2.23 if (pos[2] <= ourview.vfore)
741 greg 2.19 return(0);
742 greg 2.18 if (ourview.type == VT_PER) {
743     pos[0] /= pos[2];
744     pos[1] /= pos[2];
745     }
746     pos[0] += .5 - ourview.hoff;
747     pos[1] += .5 - ourview.voff;
748 greg 2.23 pos[2] -= ourview.vfore;
749 greg 2.19 } else {
750     if (viewray(pt, tdir, &theirview, pos[0], pos[1]) < -FTINY)
751     return(0);
752 schorsch 2.37 if ((!normdist) & (theirview.type == VT_PER)) /* adjust */
753 greg 2.20 pos[2] *= sqrt(1. + pos[0]*pos[0]*theirview.hn2
754     + pos[1]*pos[1]*theirview.vn2);
755 greg 2.19 pt[0] += tdir[0]*pos[2];
756     pt[1] += tdir[1]*pos[2];
757     pt[2] += tdir[2]*pos[2];
758     viewloc(pos, &ourview, pt);
759     if (pos[2] <= 0)
760     return(0);
761     }
762 schorsch 2.37 if ((pos[0] < 0) | (pos[0] >= 1-FTINY) | (pos[1] < 0) | (pos[1] >= 1-FTINY))
763 greg 2.18 return(0);
764 greg 2.19 if (!averaging)
765     return(1);
766 gwlarson 2.32 /* compute pixel weight */
767     if (ourview.type == VT_PAR) {
768     d = DOT(ourview.vdir,tdir);
769     d = 1. - d*d;
770     } else {
771     VSUB(odir, pt, ourview.vp);
772     d = DOT(odir,tdir);
773     d = 1. - d*d/DOT(odir,odir);
774     }
775     if (d <= 1./MAXWT/MAXWT)
776 greg 2.19 return(MAXWT); /* clip to maximum weight */
777 gwlarson 2.32 return(1./sqrt(d));
778 greg 2.18 }
779    
780    
781 schorsch 2.41 static int
782     getperim( /* compute overlapping image area */
783     register struct bound *xl,
784     struct bound *yl,
785     float *zline,
786     int zfd
787     )
788 greg 2.16 {
789     int step;
790     FVECT pos;
791     register int x, y;
792     /* set up step size */
793     if (scanlen(&tresolu) < numscans(&tresolu))
794     step = scanlen(&tresolu)/NSTEPS;
795     else
796     step = numscans(&tresolu)/NSTEPS;
797     if (step < MINSTEP) { /* not worth cropping? */
798     yl->min = 0;
799     yl->max = numscans(&tresolu) - 1;
800     x = scanlen(&tresolu) - 1;
801     for (y = numscans(&tresolu); y--; ) {
802     xl[y].min = 0;
803     xl[y].max = x;
804     }
805     return(1);
806     }
807     yl->min = 32000; yl->max = 0; /* search for points on image */
808     for (y = step - 1; y < numscans(&tresolu); y += step) {
809     if (zfd != -1) {
810 greg 2.33 if (lseek(zfd, (off_t)y*scanlen(&tresolu)*sizeof(float),
811 greg 2.38 SEEK_SET) < 0)
812 greg 2.16 syserror("lseek");
813     if (read(zfd, (char *)zline,
814     scanlen(&tresolu)*sizeof(float))
815     < scanlen(&tresolu)*sizeof(float))
816     syserror("read");
817     }
818     xl[y].min = 32000; xl[y].max = 0; /* x max */
819     for (x = scanlen(&tresolu); (x -= step) > 0; ) {
820     pix2loc(pos, &tresolu, x, y);
821     pos[2] = zline[x];
822 greg 2.19 if (movepixel(pos) > FTINY) {
823 greg 2.16 xl[y].max = x + step - 1;
824     xl[y].min = x - step + 1; /* x min */
825     if (xl[y].min < 0)
826     xl[y].min = 0;
827     for (x = step - 1; x < xl[y].max; x += step) {
828     pix2loc(pos, &tresolu, x, y);
829     pos[2] = zline[x];
830 greg 2.19 if (movepixel(pos) > FTINY) {
831 greg 2.16 xl[y].min = x - step + 1;
832     break;
833     }
834     }
835     if (y < yl->min) /* y limits */
836     yl->min = y - step + 1;
837     yl->max = y + step - 1;
838     break;
839     }
840     }
841     /* fill in between */
842 greg 2.18 if (y < step) {
843 greg 2.16 xl[y-1].min = xl[y].min;
844     xl[y-1].max = xl[y].max;
845 greg 2.18 } else {
846     if (xl[y].min < xl[y-step].min)
847     xl[y-1].min = xl[y].min;
848     else
849     xl[y-1].min = xl[y-step].min;
850     if (xl[y].max > xl[y-step].max)
851     xl[y-1].max = xl[y].max;
852     else
853     xl[y-1].max = xl[y-step].max;
854     }
855 greg 2.16 for (x = 2; x < step; x++)
856 schorsch 2.36 *(xl+y-x) = *(xl+y-1);
857 greg 2.16 }
858     if (yl->max >= numscans(&tresolu))
859     yl->max = numscans(&tresolu) - 1;
860 greg 2.20 y -= step;
861 greg 2.16 for (x = numscans(&tresolu) - 1; x > y; x--) /* fill bottom rows */
862 schorsch 2.36 *(xl+x) = *(xl+y);
863 greg 2.16 return(yl->max >= yl->min);
864 greg 1.8 }
865    
866    
867 schorsch 2.41 static void
868     backpicture( /* background fill algorithm */
869     fillfunc_t *fill,
870     int samp
871     )
872 greg 1.1 {
873 greg 1.2 int *yback, xback;
874 greg 1.1 int y;
875 greg 1.2 register int x, i;
876     /* get back buffer */
877 greg 1.17 yback = (int *)malloc(hresolu*sizeof(int));
878 greg 1.15 if (yback == NULL)
879 greg 2.10 syserror(progname);
880 greg 1.17 for (x = 0; x < hresolu; x++)
881 greg 1.4 yback[x] = -2;
882 greg 1.7 /*
883     * Xback and yback are the pixel locations of suitable
884     * background values in each direction.
885     * A value of -2 means unassigned, and -1 means
886     * that there is no suitable background in this direction.
887     */
888 greg 1.2 /* fill image */
889 greg 1.17 for (y = 0; y < vresolu; y++) {
890 greg 1.4 xback = -2;
891 greg 1.17 for (x = 0; x < hresolu; x++)
892 greg 1.8 if (zscan(y)[x] <= 0) { /* empty pixel */
893 greg 1.7 /*
894     * First, find background from above or below.
895     * (farthest assigned pixel)
896     */
897 greg 1.4 if (yback[x] == -2) {
898 greg 1.17 for (i = y+1; i < vresolu; i++)
899 greg 1.8 if (zscan(i)[x] > 0)
900 greg 1.4 break;
901 greg 1.17 if (i < vresolu
902 greg 1.2 && (y <= 0 || zscan(y-1)[x] < zscan(i)[x]))
903 greg 1.4 yback[x] = i;
904     else
905     yback[x] = y-1;
906 greg 1.2 }
907 greg 1.7 /*
908     * Next, find background from left or right.
909     */
910 greg 1.4 if (xback == -2) {
911 greg 1.17 for (i = x+1; i < hresolu; i++)
912 greg 1.8 if (zscan(y)[i] > 0)
913 greg 1.4 break;
914 greg 1.17 if (i < hresolu
915 greg 1.4 && (x <= 0 || zscan(y)[x-1] < zscan(y)[i]))
916     xback = i;
917     else
918     xback = x-1;
919     }
920 greg 1.7 /*
921 greg 1.26 * If we have no background for this pixel,
922     * use the given fill function.
923 greg 1.11 */
924 greg 1.27 if (xback < 0 && yback[x] < 0)
925     goto fillit;
926 greg 1.11 /*
927 greg 1.7 * Compare, and use the background that is
928     * farther, unless one of them is next to us.
929 greg 1.27 * If the background is too distant, call
930     * the fill function.
931 greg 1.7 */
932 greg 1.11 if ( yback[x] < 0
933     || (xback >= 0 && ABS(x-xback) <= 1)
934 greg 1.4 || ( ABS(y-yback[x]) > 1
935 greg 1.11 && zscan(yback[x])[x]
936 greg 1.13 < zscan(y)[xback] ) ) {
937 greg 1.27 if (samp > 0 && ABS(x-xback) >= samp)
938     goto fillit;
939 greg 2.19 if (averaging) {
940     copycolor(sscan(y)[x],
941     sscan(y)[xback]);
942     wscan(y)[x] = wscan(y)[xback];
943     } else
944     copycolr(pscan(y)[x],
945     pscan(y)[xback]);
946 greg 1.13 zscan(y)[x] = zscan(y)[xback];
947     } else {
948 greg 1.27 if (samp > 0 && ABS(y-yback[x]) > samp)
949     goto fillit;
950 greg 2.19 if (averaging) {
951     copycolor(sscan(y)[x],
952     sscan(yback[x])[x]);
953     wscan(y)[x] =
954     wscan(yback[x])[x];
955     } else
956     copycolr(pscan(y)[x],
957     pscan(yback[x])[x]);
958 greg 1.13 zscan(y)[x] = zscan(yback[x])[x];
959 greg 1.27 }
960     continue;
961     fillit:
962     (*fill)(x,y);
963     if (fill == rcalfill) { /* use it */
964     clearqueue();
965     xback = x;
966     yback[x] = y;
967 greg 1.13 }
968 greg 1.4 } else { /* full pixel */
969     yback[x] = -2;
970     xback = -2;
971     }
972     }
973 greg 2.33 free((void *)yback);
974 greg 1.1 }
975    
976    
977 schorsch 2.41 static void
978     fillpicture( /* paint in empty pixels using fill */
979     fillfunc_t *fill
980     )
981 greg 1.11 {
982     register int x, y;
983    
984 greg 1.17 for (y = 0; y < vresolu; y++)
985     for (x = 0; x < hresolu; x++)
986 greg 1.11 if (zscan(y)[x] <= 0)
987 greg 1.25 (*fill)(x,y);
988 greg 2.26 if (fill == rcalfill)
989     clearqueue();
990 greg 2.15 }
991    
992    
993 schorsch 2.41 static int
994     clipaft(void) /* perform aft clipping as indicated */
995 greg 2.15 {
996     register int x, y;
997 schorsch 2.37 int adjtest = (ourview.type == VT_PER) & zisnorm;
998 greg 2.15 double tstdist;
999     double yzn2, vx;
1000    
1001     if (ourview.vaft <= FTINY)
1002 greg 2.24 return(0);
1003 greg 2.17 tstdist = ourview.vaft - ourview.vfore;
1004 greg 2.15 for (y = 0; y < vresolu; y++) {
1005 greg 2.22 if (adjtest) { /* adjust test */
1006 greg 2.15 yzn2 = (y+.5)/vresolu + ourview.voff - .5;
1007     yzn2 = 1. + yzn2*yzn2*ourview.vn2;
1008 greg 2.17 tstdist = (ourview.vaft - ourview.vfore)*sqrt(yzn2);
1009 greg 2.15 }
1010     for (x = 0; x < hresolu; x++)
1011     if (zscan(y)[x] > tstdist) {
1012 greg 2.22 if (adjtest) {
1013 greg 2.15 vx = (x+.5)/hresolu + ourview.hoff - .5;
1014 greg 2.17 if (zscan(y)[x] <= (ourview.vaft -
1015     ourview.vfore) *
1016 greg 2.15 sqrt(vx*vx*ourview.hn2 + yzn2))
1017     continue;
1018     }
1019 greg 2.19 if (averaging)
1020 schorsch 2.35 memset(sscan(y)[x], '\0', sizeof(COLOR));
1021 greg 2.19 else
1022 schorsch 2.35 memset(pscan(y)[x], '\0', sizeof(COLR));
1023 greg 2.15 zscan(y)[x] = 0.0;
1024     }
1025     }
1026 greg 2.24 return(1);
1027 greg 1.11 }
1028    
1029    
1030 schorsch 2.41 static int
1031     addblur(void) /* add to blurred picture */
1032 greg 2.24 {
1033     COLOR cval;
1034     double d;
1035     register int i;
1036    
1037     if (!blurring)
1038     return(0);
1039     i = hresolu*vresolu;
1040     if (nvavg < 2)
1041     if (averaging)
1042     while (i--) {
1043     copycolor(ourbpict[i], ourspict[i]);
1044     d = 1.0/ourweigh[i];
1045     scalecolor(ourbpict[i], d);
1046     }
1047     else
1048     while (i--)
1049     colr_color(ourbpict[i], ourpict[i]);
1050     else
1051     if (averaging)
1052     while (i--) {
1053     copycolor(cval, ourspict[i]);
1054     d = 1.0/ourweigh[i];
1055     scalecolor(cval, d);
1056     addcolor(ourbpict[i], cval);
1057     }
1058     else
1059     while (i--) {
1060     colr_color(cval, ourpict[i]);
1061     addcolor(ourbpict[i], cval);
1062     }
1063     /* print view */
1064     printf("VIEW%d:", nvavg);
1065     fprintview(&ourview, stdout);
1066     putchar('\n');
1067     return(1);
1068     }
1069    
1070    
1071 schorsch 2.41 static void
1072     writepicture(void) /* write out picture (alters buffer) */
1073 greg 1.1 {
1074     int y;
1075 greg 2.19 register int x;
1076     double d;
1077 greg 1.1
1078 greg 1.34 fprtresolu(hresolu, vresolu, stdout);
1079 greg 1.17 for (y = vresolu-1; y >= 0; y--)
1080 greg 2.24 if (blurring) {
1081     for (x = 0; x < hresolu; x++) { /* compute avg. */
1082     d = rexpadj/nvavg;
1083     scalecolor(bscan(y)[x], d);
1084     }
1085     if (fwritescan(bscan(y), hresolu, stdout) < 0)
1086     syserror(progname);
1087     } else if (averaging) {
1088 greg 2.19 for (x = 0; x < hresolu; x++) { /* average pixels */
1089 greg 2.21 d = rexpadj/wscan(y)[x];
1090 greg 2.19 scalecolor(sscan(y)[x], d);
1091     }
1092     if (fwritescan(sscan(y), hresolu, stdout) < 0)
1093     syserror(progname);
1094 greg 2.21 } else {
1095     if (expadj)
1096     shiftcolrs(pscan(y), hresolu, expadj);
1097     if (fwritecolrs(pscan(y), hresolu, stdout) < 0)
1098     syserror(progname);
1099     }
1100 greg 1.11 }
1101    
1102    
1103 schorsch 2.41 static void
1104     writedistance( /* write out z file (alters buffer) */
1105     char *fname
1106     )
1107 greg 1.11 {
1108 greg 2.22 int donorm = normdist & !zisnorm ? 1 :
1109 schorsch 2.37 (ourview.type == VT_PER) & !normdist & zisnorm ? -1 : 0;
1110 greg 1.19 int fd;
1111 greg 1.11 int y;
1112    
1113 greg 2.10 if ((fd = open(fname, O_WRONLY|O_CREAT|O_TRUNC, 0666)) == -1)
1114     syserror(fname);
1115 greg 1.17 for (y = vresolu-1; y >= 0; y--) {
1116 greg 1.11 if (donorm) {
1117 greg 2.22 double vx, yzn2, d;
1118 greg 1.11 register int x;
1119 greg 1.29 yzn2 = (y+.5)/vresolu + ourview.voff - .5;
1120 greg 1.17 yzn2 = 1. + yzn2*yzn2*ourview.vn2;
1121     for (x = 0; x < hresolu; x++) {
1122 greg 1.29 vx = (x+.5)/hresolu + ourview.hoff - .5;
1123 greg 2.22 d = sqrt(vx*vx*ourview.hn2 + yzn2);
1124     if (donorm > 0)
1125     zscan(y)[x] *= d;
1126     else
1127     zscan(y)[x] /= d;
1128 greg 1.11 }
1129 greg 2.22 }
1130     if (write(fd, (char *)zscan(y), hresolu*sizeof(float))
1131 greg 2.10 < hresolu*sizeof(float))
1132     syserror(fname);
1133 greg 1.11 }
1134 greg 1.19 close(fd);
1135 greg 1.10 }
1136    
1137    
1138 schorsch 2.41 static void
1139     backfill( /* fill pixel with background */
1140     int x,
1141     int y
1142     )
1143 greg 1.12 {
1144 greg 2.19 if (averaging) {
1145     copycolor(sscan(y)[x], backcolor);
1146     wscan(y)[x] = 1;
1147     } else
1148     copycolr(pscan(y)[x], backcolr);
1149 greg 1.13 zscan(y)[x] = backz;
1150     }
1151    
1152    
1153 schorsch 2.41 static void
1154     calstart( /* start fill calculation */
1155     char *prog,
1156     char *args
1157     )
1158 greg 1.13 {
1159     char combuf[512];
1160 greg 2.3 char *argv[64];
1161     int rval;
1162     register char **wp, *cp;
1163 greg 1.13
1164 schorsch 2.34 if (PDesc.running) {
1165 greg 1.14 fprintf(stderr, "%s: too many calculations\n", progname);
1166     exit(1);
1167     }
1168 greg 2.3 strcpy(combuf, prog);
1169     strcat(combuf, args);
1170     cp = combuf;
1171     wp = argv;
1172     for ( ; ; ) {
1173 greg 2.11 while (isspace(*cp)) /* nullify spaces */
1174     *cp++ = '\0';
1175     if (!*cp) /* all done? */
1176     break;
1177     *wp++ = cp; /* add argument to list */
1178     while (*++cp && !isspace(*cp))
1179     ;
1180 greg 2.3 }
1181     *wp = NULL;
1182     /* start process */
1183 schorsch 2.34 if ((rval = open_process(&PDesc, argv)) < 0)
1184 greg 2.10 syserror(progname);
1185 greg 2.3 if (rval == 0) {
1186     fprintf(stderr, "%s: command not found\n", argv[0]);
1187     exit(1);
1188 greg 1.13 }
1189 greg 2.3 packsiz = rval/(6*sizeof(float)) - 1;
1190     if (packsiz > PACKSIZ)
1191     packsiz = PACKSIZ;
1192 greg 1.13 queuesiz = 0;
1193     }
1194    
1195    
1196 schorsch 2.41 static void
1197     caldone(void) /* done with calculation */
1198 greg 1.13 {
1199 schorsch 2.34 if (!PDesc.running)
1200 greg 1.14 return;
1201 greg 1.25 clearqueue();
1202 schorsch 2.34 close_process(&PDesc);
1203 greg 1.13 }
1204    
1205    
1206 schorsch 2.41 static void
1207     rcalfill( /* fill with ray-calculated pixel */
1208     int x,
1209     int y
1210     )
1211 greg 1.13 {
1212 greg 2.3 if (queuesiz >= packsiz) /* flush queue if needed */
1213 greg 1.25 clearqueue();
1214 greg 1.22 /* add position to queue */
1215 greg 1.13 queue[queuesiz][0] = x;
1216     queue[queuesiz][1] = y;
1217     queuesiz++;
1218     }
1219    
1220    
1221 schorsch 2.41 static void
1222     clearqueue(void) /* process queue */
1223 greg 1.13 {
1224 greg 1.22 FVECT orig, dir;
1225 greg 2.3 float fbuf[6*(PACKSIZ+1)];
1226     register float *fbp;
1227 greg 1.13 register int i;
1228 greg 2.22 double vx, vy;
1229 greg 1.13
1230 greg 2.10 if (queuesiz == 0)
1231     return;
1232 greg 2.3 fbp = fbuf;
1233 greg 1.13 for (i = 0; i < queuesiz; i++) {
1234 greg 1.22 viewray(orig, dir, &ourview,
1235     (queue[i][0]+.5)/hresolu,
1236     (queue[i][1]+.5)/vresolu);
1237 greg 2.3 *fbp++ = orig[0]; *fbp++ = orig[1]; *fbp++ = orig[2];
1238     *fbp++ = dir[0]; *fbp++ = dir[1]; *fbp++ = dir[2];
1239 greg 1.22 }
1240 greg 2.3 /* mark end and get results */
1241 schorsch 2.35 memset((char *)fbp, '\0', 6*sizeof(float));
1242 schorsch 2.34 if (process(&PDesc, (char *)fbuf, (char *)fbuf,
1243 greg 2.33 4*sizeof(float)*(queuesiz+1),
1244 greg 2.3 6*sizeof(float)*(queuesiz+1)) !=
1245 gregl 2.29 4*sizeof(float)*(queuesiz+1)) {
1246 greg 2.3 fprintf(stderr, "%s: error reading from rtrace process\n",
1247     progname);
1248     exit(1);
1249     }
1250     fbp = fbuf;
1251 greg 1.22 for (i = 0; i < queuesiz; i++) {
1252 greg 1.16 if (ourexp > 0 && ourexp != 1.0) {
1253 greg 2.3 fbp[0] *= ourexp;
1254     fbp[1] *= ourexp;
1255     fbp[2] *= ourexp;
1256 greg 1.14 }
1257 greg 2.19 if (averaging) {
1258     setcolor(sscan(queue[i][1])[queue[i][0]],
1259     fbp[0], fbp[1], fbp[2]);
1260 greg 2.26 wscan(queue[i][1])[queue[i][0]] = 1;
1261 greg 2.19 } else
1262     setcolr(pscan(queue[i][1])[queue[i][0]],
1263     fbp[0], fbp[1], fbp[2]);
1264 greg 2.22 if (zisnorm)
1265     zscan(queue[i][1])[queue[i][0]] = fbp[3];
1266     else {
1267     vx = (queue[i][0]+.5)/hresolu + ourview.hoff - .5;
1268     vy = (queue[i][1]+.5)/vresolu + ourview.voff - .5;
1269     zscan(queue[i][1])[queue[i][0]] = fbp[3] / sqrt(1. +
1270     vx*vx*ourview.hn2 + vy*vy*ourview.vn2);
1271     }
1272 greg 2.3 fbp += 4;
1273 greg 1.13 }
1274     queuesiz = 0;
1275 greg 1.14 }
1276    
1277    
1278 schorsch 2.41 static void
1279     syserror( /* report error and exit */
1280     char *s
1281     )
1282 greg 1.14 {
1283 greg 2.10 perror(s);
1284 greg 1.14 exit(1);
1285 greg 1.1 }