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root/radiance/ray/src/px/pinterp.c
Revision: 2.41
Committed: Sun Mar 28 20:33:14 2004 UTC (20 years, 1 month ago) by schorsch
Content type: text/plain
Branch: MAIN
CVS Tags: rad3R6, rad3R6P1
Changes since 2.40: +119 -56 lines
Log Message: 
Continued ANSIfication, and other fixes and clarifications.

File Contents

# User Rev Content
1 greg 1.1 #ifndef lint
2 schorsch 2.41 static const char RCSid[] = "$Id: pinterp.c,v 2.40 2004/01/02 12:47:01 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     avgview.horiz += ourview.horiz;
418     avgview.vert += ourview.vert;
419     avgview.hoff += ourview.hoff;
420     avgview.voff += ourview.voff;
421     avgview.vfore += ourview.vfore;
422     avgview.vaft += ourview.vaft;
423     return(nvavg++);
424     }
425    
426    
427 schorsch 2.41 static void
428     compavgview(void) /* compute average view */
429 greg 2.24 {
430     register int i;
431     double f;
432    
433     if (nvavg < 2)
434     return;
435     f = 1.0/nvavg;
436     for (i = 0; i < 3; i++) {
437     avgview.vp[i] *= f;
438     avgview.vdir[i] *= f;
439     avgview.vup[i] *= f;
440     }
441     avgview.horiz *= f;
442     avgview.vert *= f;
443     avgview.hoff *= f;
444     avgview.voff *= f;
445     avgview.vfore *= f;
446     avgview.vaft *= f;
447     if (setview(&avgview) != NULL) /* in case of emergency... */
448 schorsch 2.36 avgview = ourview;
449 greg 2.24 pixaspect = viewaspect(&avgview) * hresolu / vresolu;
450     }
451    
452    
453 schorsch 2.41 static void
454     addpicture( /* add picture to output */
455     char *pfile,
456     char *zspec
457     )
458 greg 1.1 {
459 greg 1.19 FILE *pfp;
460     int zfd;
461 greg 1.8 char *err;
462 greg 1.1 COLR *scanin;
463 greg 1.15 float *zin;
464     struct position *plast;
465 greg 2.16 struct bound *xlim, ylim;
466 greg 1.1 int y;
467 greg 1.10 /* open picture file */
468 greg 2.10 if ((pfp = fopen(pfile, "r")) == NULL)
469     syserror(pfile);
470 greg 1.16 /* get header with exposure and view */
471     theirexp = 1.0;
472 schorsch 2.36 theirview = stdview;
473 greg 1.16 gotview = 0;
474 greg 2.24 if (nvavg < 2)
475     printf("%s:\n", pfile);
476 greg 1.33 getheader(pfp, headline, NULL);
477 greg 1.34 if (wrongformat || !gotview || !fgetsresolu(&tresolu, pfp)) {
478 greg 1.33 fprintf(stderr, "%s: picture format error\n", pfile);
479 greg 1.1 exit(1);
480     }
481 greg 1.16 if (ourexp <= 0)
482     ourexp = theirexp;
483     else if (ABS(theirexp-ourexp) > .01*ourexp)
484     fprintf(stderr, "%s: different exposure (warning)\n", pfile);
485 schorsch 2.37 if ( (err = setview(&theirview)) ) {
486 greg 1.1 fprintf(stderr, "%s: %s\n", pfile, err);
487     exit(1);
488     }
489 greg 1.5 /* compute transformation */
490 greg 1.30 hasmatrix = pixform(theirs2ours, &theirview, &ourview);
491 greg 2.16 /* get z specification or file */
492 greg 1.34 zin = (float *)malloc(scanlen(&tresolu)*sizeof(float));
493 greg 2.16 if (zin == NULL)
494 greg 2.10 syserror(progname);
495 greg 1.19 if ((zfd = open(zspec, O_RDONLY)) == -1) {
496 greg 1.10 double zvalue;
497     register int x;
498 greg 2.19 if (!isflt(zspec) || (zvalue = atof(zspec)) <= 0.0)
499 greg 2.10 syserror(zspec);
500 greg 1.34 for (x = scanlen(&tresolu); x-- > 0; )
501 greg 1.10 zin[x] = zvalue;
502     }
503 greg 2.16 /* compute transferrable perimeter */
504     xlim = (struct bound *)malloc(numscans(&tresolu)*sizeof(struct bound));
505     if (xlim == NULL)
506     syserror(progname);
507     if (!getperim(xlim, &ylim, zin, zfd)) { /* overlapping area? */
508 greg 2.33 free((void *)zin);
509     free((void *)xlim);
510 greg 2.16 if (zfd != -1)
511     close(zfd);
512     fclose(pfp);
513     return;
514     }
515     /* allocate scanlines */
516     scanin = (COLR *)malloc(scanlen(&tresolu)*sizeof(COLR));
517     plast = (struct position *)calloc(scanlen(&tresolu),
518     sizeof(struct position));
519 schorsch 2.37 if ((scanin == NULL) | (plast == NULL))
520 greg 2.16 syserror(progname);
521     /* skip to starting point */
522     for (y = 0; y < ylim.min; y++)
523     if (freadcolrs(scanin, scanlen(&tresolu), pfp) < 0) {
524     fprintf(stderr, "%s: read error\n", pfile);
525     exit(1);
526     }
527     if (zfd != -1 && lseek(zfd,
528 greg 2.38 (off_t)ylim.min*scanlen(&tresolu)*sizeof(float),
529     SEEK_SET) < 0)
530 greg 2.16 syserror(zspec);
531 greg 1.1 /* load image */
532 greg 2.16 for (y = ylim.min; y <= ylim.max; y++) {
533 greg 1.34 if (freadcolrs(scanin, scanlen(&tresolu), pfp) < 0) {
534 greg 1.1 fprintf(stderr, "%s: read error\n", pfile);
535     exit(1);
536     }
537 greg 2.16 if (zfd != -1 && read(zfd, (char *)zin,
538 greg 1.34 scanlen(&tresolu)*sizeof(float))
539 greg 2.16 < scanlen(&tresolu)*sizeof(float))
540     syserror(zspec);
541     addscanline(xlim+y, y, scanin, zin, plast);
542 greg 1.1 }
543     /* clean up */
544 greg 2.33 free((void *)xlim);
545     free((void *)scanin);
546     free((void *)zin);
547     free((void *)plast);
548 greg 1.1 fclose(pfp);
549 greg 1.19 if (zfd != -1)
550     close(zfd);
551 greg 1.1 }
552    
553    
554 schorsch 2.41 static int
555     pixform( /* compute view1 to view2 matrix */
556     register MAT4 xfmat,
557     register VIEW *vw1,
558     register VIEW *vw2
559     )
560 greg 1.5 {
561     double m4t[4][4];
562    
563 schorsch 2.37 if ((vw1->type != VT_PER) & (vw1->type != VT_PAR))
564 greg 1.30 return(0);
565 schorsch 2.37 if ((vw2->type != VT_PER) & (vw2->type != VT_PAR))
566 greg 1.30 return(0);
567 greg 1.5 setident4(xfmat);
568 greg 1.17 xfmat[0][0] = vw1->hvec[0];
569     xfmat[0][1] = vw1->hvec[1];
570     xfmat[0][2] = vw1->hvec[2];
571     xfmat[1][0] = vw1->vvec[0];
572     xfmat[1][1] = vw1->vvec[1];
573     xfmat[1][2] = vw1->vvec[2];
574 greg 1.5 xfmat[2][0] = vw1->vdir[0];
575     xfmat[2][1] = vw1->vdir[1];
576     xfmat[2][2] = vw1->vdir[2];
577     xfmat[3][0] = vw1->vp[0];
578     xfmat[3][1] = vw1->vp[1];
579     xfmat[3][2] = vw1->vp[2];
580     setident4(m4t);
581 greg 1.17 m4t[0][0] = vw2->hvec[0]/vw2->hn2;
582     m4t[1][0] = vw2->hvec[1]/vw2->hn2;
583     m4t[2][0] = vw2->hvec[2]/vw2->hn2;
584     m4t[3][0] = -DOT(vw2->vp,vw2->hvec)/vw2->hn2;
585     m4t[0][1] = vw2->vvec[0]/vw2->vn2;
586     m4t[1][1] = vw2->vvec[1]/vw2->vn2;
587     m4t[2][1] = vw2->vvec[2]/vw2->vn2;
588     m4t[3][1] = -DOT(vw2->vp,vw2->vvec)/vw2->vn2;
589 greg 1.5 m4t[0][2] = vw2->vdir[0];
590     m4t[1][2] = vw2->vdir[1];
591     m4t[2][2] = vw2->vdir[2];
592     m4t[3][2] = -DOT(vw2->vp,vw2->vdir);
593     multmat4(xfmat, xfmat, m4t);
594 greg 1.30 return(1);
595 greg 1.5 }
596    
597    
598 schorsch 2.41 static void
599     addscanline( /* add scanline to output */
600     struct bound *xl,
601     int y,
602     COLR *pline,
603     float *zline,
604     struct position *lasty /* input/output */
605     )
606 greg 1.1 {
607 greg 1.30 FVECT pos;
608 greg 1.15 struct position lastx, newpos;
609 greg 2.19 double wt;
610 greg 1.1 register int x;
611    
612 greg 1.20 lastx.z = 0;
613 greg 2.16 for (x = xl->max; x >= xl->min; x--) {
614 greg 1.34 pix2loc(pos, &tresolu, x, y);
615 greg 1.5 pos[2] = zline[x];
616 greg 2.19 if ((wt = movepixel(pos)) <= FTINY) {
617 greg 1.15 lasty[x].z = lastx.z = 0; /* mark invalid */
618 greg 1.1 continue;
619 greg 1.15 }
620 greg 2.19 /* add pixel to our image */
621 greg 1.17 newpos.x = pos[0] * hresolu;
622     newpos.y = pos[1] * vresolu;
623 greg 1.15 newpos.z = zline[x];
624 greg 2.19 addpixel(&newpos, &lastx, &lasty[x], pline[x], wt, pos[2]);
625     lasty[x].x = lastx.x = newpos.x;
626     lasty[x].y = lastx.y = newpos.y;
627     lasty[x].z = lastx.z = newpos.z;
628 greg 1.1 }
629     }
630    
631    
632 schorsch 2.41 static void
633     addpixel( /* fill in pixel parallelogram */
634     struct position *p0,
635     struct position *p1,
636     struct position *p2,
637     COLR pix,
638     double w,
639     double z
640     )
641 greg 1.8 {
642 greg 1.15 double zt = 2.*zeps*p0->z; /* threshold */
643 greg 2.19 COLOR pval; /* converted+weighted pixel */
644 greg 1.15 int s1x, s1y, s2x, s2y; /* step sizes */
645     int l1, l2, c1, c2; /* side lengths and counters */
646     int p1isy; /* p0p1 along y? */
647     int x1, y1; /* p1 position */
648     register int x, y; /* final position */
649    
650     /* compute vector p0p1 */
651 greg 1.25 if (fillo&F_FORE && ABS(p1->z-p0->z) <= zt) {
652 greg 1.15 s1x = p1->x - p0->x;
653     s1y = p1->y - p0->y;
654     l1 = ABS(s1x);
655 schorsch 2.37 if ( (p1isy = (ABS(s1y) > l1)) )
656 greg 1.15 l1 = ABS(s1y);
657 greg 2.20 else if (l1 < 1)
658 greg 2.19 l1 = 1;
659 greg 1.15 } else {
660     l1 = s1x = s1y = 1;
661     p1isy = -1;
662     }
663     /* compute vector p0p2 */
664 greg 1.25 if (fillo&F_FORE && ABS(p2->z-p0->z) <= zt) {
665 greg 1.15 s2x = p2->x - p0->x;
666     s2y = p2->y - p0->y;
667     if (p1isy == 1)
668     l2 = ABS(s2x);
669     else {
670     l2 = ABS(s2y);
671     if (p1isy != 0 && ABS(s2x) > l2)
672     l2 = ABS(s2x);
673     }
674 greg 2.19 if (l2 < 1)
675     l2 = 1;
676 greg 1.15 } else
677     l2 = s2x = s2y = 1;
678     /* fill the parallelogram */
679 greg 2.19 if (averaging) {
680     colr_color(pval, pix);
681     scalecolor(pval, w);
682     }
683 greg 1.15 for (c1 = l1; c1-- > 0; ) {
684     x1 = p0->x + c1*s1x/l1;
685     y1 = p0->y + c1*s1y/l1;
686     for (c2 = l2; c2-- > 0; ) {
687     x = x1 + c2*s2x/l2;
688 schorsch 2.37 if ((x < 0) | (x >= hresolu))
689 greg 1.28 continue;
690 greg 1.15 y = y1 + c2*s2y/l2;
691 schorsch 2.37 if ((y < 0) | (y >= vresolu))
692 greg 1.28 continue;
693 greg 2.19 if (averaging) {
694     if (zscan(y)[x] <= 0 || zscan(y)[x]-z
695 greg 1.15 > zeps*zscan(y)[x]) {
696 greg 2.19 copycolor(sscan(y)[x], pval);
697     wscan(y)[x] = w;
698     zscan(y)[x] = z;
699     } else if (z-zscan(y)[x] <= zeps*zscan(y)[x]) {
700     addcolor(sscan(y)[x], pval);
701     wscan(y)[x] += w;
702     }
703     } else if (zscan(y)[x] <= 0 || zscan(y)[x]-z
704     > zeps*zscan(y)[x]) {
705     copycolr(pscan(y)[x], pix);
706 greg 1.8 zscan(y)[x] = z;
707     }
708 greg 1.15 }
709     }
710 greg 2.16 }
711    
712    
713 schorsch 2.41 static double
714     movepixel( /* reposition image point */
715     register FVECT pos
716     )
717 greg 2.18 {
718 greg 2.19 FVECT pt, tdir, odir;
719 greg 2.20 double d;
720 greg 2.18
721     if (pos[2] <= 0) /* empty pixel */
722 greg 2.19 return(0);
723 greg 2.22 if (usematrix) {
724 greg 2.18 pos[0] += theirview.hoff - .5;
725     pos[1] += theirview.voff - .5;
726 schorsch 2.37 if (normdist & (theirview.type == VT_PER))
727 greg 2.23 d = sqrt(1. + pos[0]*pos[0]*theirview.hn2
728     + pos[1]*pos[1]*theirview.vn2);
729     else
730     d = 1.;
731     pos[2] += d*theirview.vfore;
732 greg 2.18 if (theirview.type == VT_PER) {
733 greg 2.23 pos[2] /= d;
734 greg 2.18 pos[0] *= pos[2];
735     pos[1] *= pos[2];
736     }
737     multp3(pos, pos, theirs2ours);
738 greg 2.23 if (pos[2] <= ourview.vfore)
739 greg 2.19 return(0);
740 greg 2.18 if (ourview.type == VT_PER) {
741     pos[0] /= pos[2];
742     pos[1] /= pos[2];
743     }
744     pos[0] += .5 - ourview.hoff;
745     pos[1] += .5 - ourview.voff;
746 greg 2.23 pos[2] -= ourview.vfore;
747 greg 2.19 } else {
748     if (viewray(pt, tdir, &theirview, pos[0], pos[1]) < -FTINY)
749     return(0);
750 schorsch 2.37 if ((!normdist) & (theirview.type == VT_PER)) /* adjust */
751 greg 2.20 pos[2] *= sqrt(1. + pos[0]*pos[0]*theirview.hn2
752     + pos[1]*pos[1]*theirview.vn2);
753 greg 2.19 pt[0] += tdir[0]*pos[2];
754     pt[1] += tdir[1]*pos[2];
755     pt[2] += tdir[2]*pos[2];
756     viewloc(pos, &ourview, pt);
757     if (pos[2] <= 0)
758     return(0);
759     }
760 schorsch 2.37 if ((pos[0] < 0) | (pos[0] >= 1-FTINY) | (pos[1] < 0) | (pos[1] >= 1-FTINY))
761 greg 2.18 return(0);
762 greg 2.19 if (!averaging)
763     return(1);
764 gwlarson 2.32 /* compute pixel weight */
765     if (ourview.type == VT_PAR) {
766     d = DOT(ourview.vdir,tdir);
767     d = 1. - d*d;
768     } else {
769     VSUB(odir, pt, ourview.vp);
770     d = DOT(odir,tdir);
771     d = 1. - d*d/DOT(odir,odir);
772     }
773     if (d <= 1./MAXWT/MAXWT)
774 greg 2.19 return(MAXWT); /* clip to maximum weight */
775 gwlarson 2.32 return(1./sqrt(d));
776 greg 2.18 }
777    
778    
779 schorsch 2.41 static int
780     getperim( /* compute overlapping image area */
781     register struct bound *xl,
782     struct bound *yl,
783     float *zline,
784     int zfd
785     )
786 greg 2.16 {
787     int step;
788     FVECT pos;
789     register int x, y;
790     /* set up step size */
791     if (scanlen(&tresolu) < numscans(&tresolu))
792     step = scanlen(&tresolu)/NSTEPS;
793     else
794     step = numscans(&tresolu)/NSTEPS;
795     if (step < MINSTEP) { /* not worth cropping? */
796     yl->min = 0;
797     yl->max = numscans(&tresolu) - 1;
798     x = scanlen(&tresolu) - 1;
799     for (y = numscans(&tresolu); y--; ) {
800     xl[y].min = 0;
801     xl[y].max = x;
802     }
803     return(1);
804     }
805     yl->min = 32000; yl->max = 0; /* search for points on image */
806     for (y = step - 1; y < numscans(&tresolu); y += step) {
807     if (zfd != -1) {
808 greg 2.33 if (lseek(zfd, (off_t)y*scanlen(&tresolu)*sizeof(float),
809 greg 2.38 SEEK_SET) < 0)
810 greg 2.16 syserror("lseek");
811     if (read(zfd, (char *)zline,
812     scanlen(&tresolu)*sizeof(float))
813     < scanlen(&tresolu)*sizeof(float))
814     syserror("read");
815     }
816     xl[y].min = 32000; xl[y].max = 0; /* x max */
817     for (x = scanlen(&tresolu); (x -= step) > 0; ) {
818     pix2loc(pos, &tresolu, x, y);
819     pos[2] = zline[x];
820 greg 2.19 if (movepixel(pos) > FTINY) {
821 greg 2.16 xl[y].max = x + step - 1;
822     xl[y].min = x - step + 1; /* x min */
823     if (xl[y].min < 0)
824     xl[y].min = 0;
825     for (x = step - 1; x < xl[y].max; x += step) {
826     pix2loc(pos, &tresolu, x, y);
827     pos[2] = zline[x];
828 greg 2.19 if (movepixel(pos) > FTINY) {
829 greg 2.16 xl[y].min = x - step + 1;
830     break;
831     }
832     }
833     if (y < yl->min) /* y limits */
834     yl->min = y - step + 1;
835     yl->max = y + step - 1;
836     break;
837     }
838     }
839     /* fill in between */
840 greg 2.18 if (y < step) {
841 greg 2.16 xl[y-1].min = xl[y].min;
842     xl[y-1].max = xl[y].max;
843 greg 2.18 } else {
844     if (xl[y].min < xl[y-step].min)
845     xl[y-1].min = xl[y].min;
846     else
847     xl[y-1].min = xl[y-step].min;
848     if (xl[y].max > xl[y-step].max)
849     xl[y-1].max = xl[y].max;
850     else
851     xl[y-1].max = xl[y-step].max;
852     }
853 greg 2.16 for (x = 2; x < step; x++)
854 schorsch 2.36 *(xl+y-x) = *(xl+y-1);
855 greg 2.16 }
856     if (yl->max >= numscans(&tresolu))
857     yl->max = numscans(&tresolu) - 1;
858 greg 2.20 y -= step;
859 greg 2.16 for (x = numscans(&tresolu) - 1; x > y; x--) /* fill bottom rows */
860 schorsch 2.36 *(xl+x) = *(xl+y);
861 greg 2.16 return(yl->max >= yl->min);
862 greg 1.8 }
863    
864    
865 schorsch 2.41 static void
866     backpicture( /* background fill algorithm */
867     fillfunc_t *fill,
868     int samp
869     )
870 greg 1.1 {
871 greg 1.2 int *yback, xback;
872 greg 1.1 int y;
873 greg 1.2 register int x, i;
874     /* get back buffer */
875 greg 1.17 yback = (int *)malloc(hresolu*sizeof(int));
876 greg 1.15 if (yback == NULL)
877 greg 2.10 syserror(progname);
878 greg 1.17 for (x = 0; x < hresolu; x++)
879 greg 1.4 yback[x] = -2;
880 greg 1.7 /*
881     * Xback and yback are the pixel locations of suitable
882     * background values in each direction.
883     * A value of -2 means unassigned, and -1 means
884     * that there is no suitable background in this direction.
885     */
886 greg 1.2 /* fill image */
887 greg 1.17 for (y = 0; y < vresolu; y++) {
888 greg 1.4 xback = -2;
889 greg 1.17 for (x = 0; x < hresolu; x++)
890 greg 1.8 if (zscan(y)[x] <= 0) { /* empty pixel */
891 greg 1.7 /*
892     * First, find background from above or below.
893     * (farthest assigned pixel)
894     */
895 greg 1.4 if (yback[x] == -2) {
896 greg 1.17 for (i = y+1; i < vresolu; i++)
897 greg 1.8 if (zscan(i)[x] > 0)
898 greg 1.4 break;
899 greg 1.17 if (i < vresolu
900 greg 1.2 && (y <= 0 || zscan(y-1)[x] < zscan(i)[x]))
901 greg 1.4 yback[x] = i;
902     else
903     yback[x] = y-1;
904 greg 1.2 }
905 greg 1.7 /*
906     * Next, find background from left or right.
907     */
908 greg 1.4 if (xback == -2) {
909 greg 1.17 for (i = x+1; i < hresolu; i++)
910 greg 1.8 if (zscan(y)[i] > 0)
911 greg 1.4 break;
912 greg 1.17 if (i < hresolu
913 greg 1.4 && (x <= 0 || zscan(y)[x-1] < zscan(y)[i]))
914     xback = i;
915     else
916     xback = x-1;
917     }
918 greg 1.7 /*
919 greg 1.26 * If we have no background for this pixel,
920     * use the given fill function.
921 greg 1.11 */
922 greg 1.27 if (xback < 0 && yback[x] < 0)
923     goto fillit;
924 greg 1.11 /*
925 greg 1.7 * Compare, and use the background that is
926     * farther, unless one of them is next to us.
927 greg 1.27 * If the background is too distant, call
928     * the fill function.
929 greg 1.7 */
930 greg 1.11 if ( yback[x] < 0
931     || (xback >= 0 && ABS(x-xback) <= 1)
932 greg 1.4 || ( ABS(y-yback[x]) > 1
933 greg 1.11 && zscan(yback[x])[x]
934 greg 1.13 < zscan(y)[xback] ) ) {
935 greg 1.27 if (samp > 0 && ABS(x-xback) >= samp)
936     goto fillit;
937 greg 2.19 if (averaging) {
938     copycolor(sscan(y)[x],
939     sscan(y)[xback]);
940     wscan(y)[x] = wscan(y)[xback];
941     } else
942     copycolr(pscan(y)[x],
943     pscan(y)[xback]);
944 greg 1.13 zscan(y)[x] = zscan(y)[xback];
945     } else {
946 greg 1.27 if (samp > 0 && ABS(y-yback[x]) > samp)
947     goto fillit;
948 greg 2.19 if (averaging) {
949     copycolor(sscan(y)[x],
950     sscan(yback[x])[x]);
951     wscan(y)[x] =
952     wscan(yback[x])[x];
953     } else
954     copycolr(pscan(y)[x],
955     pscan(yback[x])[x]);
956 greg 1.13 zscan(y)[x] = zscan(yback[x])[x];
957 greg 1.27 }
958     continue;
959     fillit:
960     (*fill)(x,y);
961     if (fill == rcalfill) { /* use it */
962     clearqueue();
963     xback = x;
964     yback[x] = y;
965 greg 1.13 }
966 greg 1.4 } else { /* full pixel */
967     yback[x] = -2;
968     xback = -2;
969     }
970     }
971 greg 2.33 free((void *)yback);
972 greg 1.1 }
973    
974    
975 schorsch 2.41 static void
976     fillpicture( /* paint in empty pixels using fill */
977     fillfunc_t *fill
978     )
979 greg 1.11 {
980     register int x, y;
981    
982 greg 1.17 for (y = 0; y < vresolu; y++)
983     for (x = 0; x < hresolu; x++)
984 greg 1.11 if (zscan(y)[x] <= 0)
985 greg 1.25 (*fill)(x,y);
986 greg 2.26 if (fill == rcalfill)
987     clearqueue();
988 greg 2.15 }
989    
990    
991 schorsch 2.41 static int
992     clipaft(void) /* perform aft clipping as indicated */
993 greg 2.15 {
994     register int x, y;
995 schorsch 2.37 int adjtest = (ourview.type == VT_PER) & zisnorm;
996 greg 2.15 double tstdist;
997     double yzn2, vx;
998    
999     if (ourview.vaft <= FTINY)
1000 greg 2.24 return(0);
1001 greg 2.17 tstdist = ourview.vaft - ourview.vfore;
1002 greg 2.15 for (y = 0; y < vresolu; y++) {
1003 greg 2.22 if (adjtest) { /* adjust test */
1004 greg 2.15 yzn2 = (y+.5)/vresolu + ourview.voff - .5;
1005     yzn2 = 1. + yzn2*yzn2*ourview.vn2;
1006 greg 2.17 tstdist = (ourview.vaft - ourview.vfore)*sqrt(yzn2);
1007 greg 2.15 }
1008     for (x = 0; x < hresolu; x++)
1009     if (zscan(y)[x] > tstdist) {
1010 greg 2.22 if (adjtest) {
1011 greg 2.15 vx = (x+.5)/hresolu + ourview.hoff - .5;
1012 greg 2.17 if (zscan(y)[x] <= (ourview.vaft -
1013     ourview.vfore) *
1014 greg 2.15 sqrt(vx*vx*ourview.hn2 + yzn2))
1015     continue;
1016     }
1017 greg 2.19 if (averaging)
1018 schorsch 2.35 memset(sscan(y)[x], '\0', sizeof(COLOR));
1019 greg 2.19 else
1020 schorsch 2.35 memset(pscan(y)[x], '\0', sizeof(COLR));
1021 greg 2.15 zscan(y)[x] = 0.0;
1022     }
1023     }
1024 greg 2.24 return(1);
1025 greg 1.11 }
1026    
1027    
1028 schorsch 2.41 static int
1029     addblur(void) /* add to blurred picture */
1030 greg 2.24 {
1031     COLOR cval;
1032     double d;
1033     register int i;
1034    
1035     if (!blurring)
1036     return(0);
1037     i = hresolu*vresolu;
1038     if (nvavg < 2)
1039     if (averaging)
1040     while (i--) {
1041     copycolor(ourbpict[i], ourspict[i]);
1042     d = 1.0/ourweigh[i];
1043     scalecolor(ourbpict[i], d);
1044     }
1045     else
1046     while (i--)
1047     colr_color(ourbpict[i], ourpict[i]);
1048     else
1049     if (averaging)
1050     while (i--) {
1051     copycolor(cval, ourspict[i]);
1052     d = 1.0/ourweigh[i];
1053     scalecolor(cval, d);
1054     addcolor(ourbpict[i], cval);
1055     }
1056     else
1057     while (i--) {
1058     colr_color(cval, ourpict[i]);
1059     addcolor(ourbpict[i], cval);
1060     }
1061     /* print view */
1062     printf("VIEW%d:", nvavg);
1063     fprintview(&ourview, stdout);
1064     putchar('\n');
1065     return(1);
1066     }
1067    
1068    
1069 schorsch 2.41 static void
1070     writepicture(void) /* write out picture (alters buffer) */
1071 greg 1.1 {
1072     int y;
1073 greg 2.19 register int x;
1074     double d;
1075 greg 1.1
1076 greg 1.34 fprtresolu(hresolu, vresolu, stdout);
1077 greg 1.17 for (y = vresolu-1; y >= 0; y--)
1078 greg 2.24 if (blurring) {
1079     for (x = 0; x < hresolu; x++) { /* compute avg. */
1080     d = rexpadj/nvavg;
1081     scalecolor(bscan(y)[x], d);
1082     }
1083     if (fwritescan(bscan(y), hresolu, stdout) < 0)
1084     syserror(progname);
1085     } else if (averaging) {
1086 greg 2.19 for (x = 0; x < hresolu; x++) { /* average pixels */
1087 greg 2.21 d = rexpadj/wscan(y)[x];
1088 greg 2.19 scalecolor(sscan(y)[x], d);
1089     }
1090     if (fwritescan(sscan(y), hresolu, stdout) < 0)
1091     syserror(progname);
1092 greg 2.21 } else {
1093     if (expadj)
1094     shiftcolrs(pscan(y), hresolu, expadj);
1095     if (fwritecolrs(pscan(y), hresolu, stdout) < 0)
1096     syserror(progname);
1097     }
1098 greg 1.11 }
1099    
1100    
1101 schorsch 2.41 static void
1102     writedistance( /* write out z file (alters buffer) */
1103     char *fname
1104     )
1105 greg 1.11 {
1106 greg 2.22 int donorm = normdist & !zisnorm ? 1 :
1107 schorsch 2.37 (ourview.type == VT_PER) & !normdist & zisnorm ? -1 : 0;
1108 greg 1.19 int fd;
1109 greg 1.11 int y;
1110    
1111 greg 2.10 if ((fd = open(fname, O_WRONLY|O_CREAT|O_TRUNC, 0666)) == -1)
1112     syserror(fname);
1113 greg 1.17 for (y = vresolu-1; y >= 0; y--) {
1114 greg 1.11 if (donorm) {
1115 greg 2.22 double vx, yzn2, d;
1116 greg 1.11 register int x;
1117 greg 1.29 yzn2 = (y+.5)/vresolu + ourview.voff - .5;
1118 greg 1.17 yzn2 = 1. + yzn2*yzn2*ourview.vn2;
1119     for (x = 0; x < hresolu; x++) {
1120 greg 1.29 vx = (x+.5)/hresolu + ourview.hoff - .5;
1121 greg 2.22 d = sqrt(vx*vx*ourview.hn2 + yzn2);
1122     if (donorm > 0)
1123     zscan(y)[x] *= d;
1124     else
1125     zscan(y)[x] /= d;
1126 greg 1.11 }
1127 greg 2.22 }
1128     if (write(fd, (char *)zscan(y), hresolu*sizeof(float))
1129 greg 2.10 < hresolu*sizeof(float))
1130     syserror(fname);
1131 greg 1.11 }
1132 greg 1.19 close(fd);
1133 greg 1.10 }
1134    
1135    
1136 schorsch 2.41 static void
1137     backfill( /* fill pixel with background */
1138     int x,
1139     int y
1140     )
1141 greg 1.12 {
1142 greg 2.19 if (averaging) {
1143     copycolor(sscan(y)[x], backcolor);
1144     wscan(y)[x] = 1;
1145     } else
1146     copycolr(pscan(y)[x], backcolr);
1147 greg 1.13 zscan(y)[x] = backz;
1148     }
1149    
1150    
1151 schorsch 2.41 static void
1152     calstart( /* start fill calculation */
1153     char *prog,
1154     char *args
1155     )
1156 greg 1.13 {
1157     char combuf[512];
1158 greg 2.3 char *argv[64];
1159     int rval;
1160     register char **wp, *cp;
1161 greg 1.13
1162 schorsch 2.34 if (PDesc.running) {
1163 greg 1.14 fprintf(stderr, "%s: too many calculations\n", progname);
1164     exit(1);
1165     }
1166 greg 2.3 strcpy(combuf, prog);
1167     strcat(combuf, args);
1168     cp = combuf;
1169     wp = argv;
1170     for ( ; ; ) {
1171 greg 2.11 while (isspace(*cp)) /* nullify spaces */
1172     *cp++ = '\0';
1173     if (!*cp) /* all done? */
1174     break;
1175     *wp++ = cp; /* add argument to list */
1176     while (*++cp && !isspace(*cp))
1177     ;
1178 greg 2.3 }
1179     *wp = NULL;
1180     /* start process */
1181 schorsch 2.34 if ((rval = open_process(&PDesc, argv)) < 0)
1182 greg 2.10 syserror(progname);
1183 greg 2.3 if (rval == 0) {
1184     fprintf(stderr, "%s: command not found\n", argv[0]);
1185     exit(1);
1186 greg 1.13 }
1187 greg 2.3 packsiz = rval/(6*sizeof(float)) - 1;
1188     if (packsiz > PACKSIZ)
1189     packsiz = PACKSIZ;
1190 greg 1.13 queuesiz = 0;
1191     }
1192    
1193    
1194 schorsch 2.41 static void
1195     caldone(void) /* done with calculation */
1196 greg 1.13 {
1197 schorsch 2.34 if (!PDesc.running)
1198 greg 1.14 return;
1199 greg 1.25 clearqueue();
1200 schorsch 2.34 close_process(&PDesc);
1201 greg 1.13 }
1202    
1203    
1204 schorsch 2.41 static void
1205     rcalfill( /* fill with ray-calculated pixel */
1206     int x,
1207     int y
1208     )
1209 greg 1.13 {
1210 greg 2.3 if (queuesiz >= packsiz) /* flush queue if needed */
1211 greg 1.25 clearqueue();
1212 greg 1.22 /* add position to queue */
1213 greg 1.13 queue[queuesiz][0] = x;
1214     queue[queuesiz][1] = y;
1215     queuesiz++;
1216     }
1217    
1218    
1219 schorsch 2.41 static void
1220     clearqueue(void) /* process queue */
1221 greg 1.13 {
1222 greg 1.22 FVECT orig, dir;
1223 greg 2.3 float fbuf[6*(PACKSIZ+1)];
1224     register float *fbp;
1225 greg 1.13 register int i;
1226 greg 2.22 double vx, vy;
1227 greg 1.13
1228 greg 2.10 if (queuesiz == 0)
1229     return;
1230 greg 2.3 fbp = fbuf;
1231 greg 1.13 for (i = 0; i < queuesiz; i++) {
1232 greg 1.22 viewray(orig, dir, &ourview,
1233     (queue[i][0]+.5)/hresolu,
1234     (queue[i][1]+.5)/vresolu);
1235 greg 2.3 *fbp++ = orig[0]; *fbp++ = orig[1]; *fbp++ = orig[2];
1236     *fbp++ = dir[0]; *fbp++ = dir[1]; *fbp++ = dir[2];
1237 greg 1.22 }
1238 greg 2.3 /* mark end and get results */
1239 schorsch 2.35 memset((char *)fbp, '\0', 6*sizeof(float));
1240 schorsch 2.34 if (process(&PDesc, (char *)fbuf, (char *)fbuf,
1241 greg 2.33 4*sizeof(float)*(queuesiz+1),
1242 greg 2.3 6*sizeof(float)*(queuesiz+1)) !=
1243 gregl 2.29 4*sizeof(float)*(queuesiz+1)) {
1244 greg 2.3 fprintf(stderr, "%s: error reading from rtrace process\n",
1245     progname);
1246     exit(1);
1247     }
1248     fbp = fbuf;
1249 greg 1.22 for (i = 0; i < queuesiz; i++) {
1250 greg 1.16 if (ourexp > 0 && ourexp != 1.0) {
1251 greg 2.3 fbp[0] *= ourexp;
1252     fbp[1] *= ourexp;
1253     fbp[2] *= ourexp;
1254 greg 1.14 }
1255 greg 2.19 if (averaging) {
1256     setcolor(sscan(queue[i][1])[queue[i][0]],
1257     fbp[0], fbp[1], fbp[2]);
1258 greg 2.26 wscan(queue[i][1])[queue[i][0]] = 1;
1259 greg 2.19 } else
1260     setcolr(pscan(queue[i][1])[queue[i][0]],
1261     fbp[0], fbp[1], fbp[2]);
1262 greg 2.22 if (zisnorm)
1263     zscan(queue[i][1])[queue[i][0]] = fbp[3];
1264     else {
1265     vx = (queue[i][0]+.5)/hresolu + ourview.hoff - .5;
1266     vy = (queue[i][1]+.5)/vresolu + ourview.voff - .5;
1267     zscan(queue[i][1])[queue[i][0]] = fbp[3] / sqrt(1. +
1268     vx*vx*ourview.hn2 + vy*vy*ourview.vn2);
1269     }
1270 greg 2.3 fbp += 4;
1271 greg 1.13 }
1272     queuesiz = 0;
1273 greg 1.14 }
1274    
1275    
1276 schorsch 2.41 static void
1277     syserror( /* report error and exit */
1278     char *s
1279     )
1280 greg 1.14 {
1281 greg 2.10 perror(s);
1282 greg 1.14 exit(1);
1283 greg 1.1 }