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root/radiance/ray/src/px/pinterp.c
Revision: 2.14
Committed: Wed Dec 21 16:59:03 1994 UTC (29 years, 4 months ago) by greg
Content type: text/plain
Branch: MAIN
Changes since 2.13: +7 -3 lines
Log Message: 
added -vo and -va fore and aft clipping plane options

File Contents

# User Rev Content
1 greg 2.14 /* Copyright (c) 1994 Regents of the University of California */
2 greg 1.34
3 greg 1.1 #ifndef lint
4     static char SCCSid[] = "$SunId$ LBL";
5     #endif
6    
7     /*
8     * Interpolate and extrapolate pictures with different view parameters.
9     *
10     * Greg Ward 09Dec89
11     */
12    
13     #include "standard.h"
14    
15 greg 2.3 #include <ctype.h>
16    
17 greg 1.1 #include "view.h"
18    
19     #include "color.h"
20    
21 greg 1.34 #include "resolu.h"
22    
23 greg 1.17 #define pscan(y) (ourpict+(y)*hresolu)
24     #define zscan(y) (ourzbuf+(y)*hresolu)
25 greg 1.1
26 greg 1.13 #define F_FORE 1 /* fill foreground */
27     #define F_BACK 2 /* fill background */
28 greg 1.11
29 greg 2.3 #define PACKSIZ 256 /* max. calculation packet size */
30 greg 1.13
31 greg 2.4 #define RTCOM "rtrace -h- -ovl -fff "
32 greg 1.13
33 greg 1.3 #define ABS(x) ((x)>0?(x):-(x))
34    
35 greg 1.15 struct position {int x,y; float z;};
36    
37 greg 1.17 VIEW ourview = STDVIEW; /* desired view */
38     int hresolu = 512; /* horizontal resolution */
39     int vresolu = 512; /* vertical resolution */
40 greg 1.18 double pixaspect = 1.0; /* pixel aspect ratio */
41 greg 1.1
42 greg 1.8 double zeps = .02; /* allowed z epsilon */
43 greg 1.1
44     COLR *ourpict; /* output picture */
45     float *ourzbuf; /* corresponding z-buffer */
46    
47     char *progname;
48    
49 greg 1.25 int fillo = F_FORE|F_BACK; /* selected fill options */
50 greg 1.26 int fillsamp = 0; /* sample separation (0 == inf) */
51 greg 1.14 extern int backfill(), rcalfill(); /* fill functions */
52 greg 1.25 int (*fillfunc)() = backfill; /* selected fill function */
53 greg 1.11 COLR backcolr = BLKCOLR; /* background color */
54 greg 1.13 double backz = 0.0; /* background z value */
55 greg 1.16 int normdist = 1; /* normalized distance? */
56     double ourexp = -1; /* output picture exposure */
57 greg 1.11
58 greg 1.17 VIEW theirview = STDVIEW; /* input view */
59 greg 1.16 int gotview; /* got input view? */
60 greg 1.33 int wrongformat = 0; /* input in another format? */
61 greg 1.34 RESOLU tresolu; /* input resolution */
62 greg 1.17 double theirexp; /* input picture exposure */
63 greg 1.5 double theirs2ours[4][4]; /* transformation matrix */
64 greg 1.30 int hasmatrix = 0; /* has transformation matrix */
65 greg 1.1
66 greg 2.3 int PDesc[3] = {-1,-1,-1}; /* rtrace process descriptor */
67     #define childpid (PDesc[2])
68     unsigned short queue[PACKSIZ][2]; /* pending pixels */
69     int packsiz; /* actual packet size */
70 greg 1.13 int queuesiz; /* number of pixels pending */
71 greg 1.5
72 greg 1.13
73 greg 1.1 main(argc, argv) /* interpolate pictures */
74     int argc;
75     char *argv[];
76     {
77 greg 2.3 #define check(ol,al) if (argv[i][ol] || \
78     badarg(argc-i-1,argv+i+1,al)) \
79     goto badopt
80 greg 1.1 int gotvfile = 0;
81 greg 1.11 char *zfile = NULL;
82 greg 1.1 char *err;
83 greg 1.17 int i, rval;
84 greg 1.1
85     progname = argv[0];
86    
87 greg 1.17 for (i = 1; i < argc && argv[i][0] == '-'; i++) {
88     rval = getviewopt(&ourview, argc-i, argv+i);
89     if (rval >= 0) {
90     i += rval;
91     continue;
92     }
93 greg 1.1 switch (argv[i][1]) {
94     case 't': /* threshold */
95 greg 2.3 check(2,"f");
96 greg 1.1 zeps = atof(argv[++i]);
97     break;
98 greg 1.11 case 'n': /* dist. normalized? */
99 greg 2.3 check(2,NULL);
100 greg 1.11 normdist = !normdist;
101 greg 1.10 break;
102 greg 1.11 case 'f': /* fill type */
103     switch (argv[i][2]) {
104     case '0': /* none */
105 greg 2.3 check(3,NULL);
106 greg 1.25 fillo = 0;
107 greg 1.11 break;
108     case 'f': /* foreground */
109 greg 2.3 check(3,NULL);
110 greg 1.25 fillo = F_FORE;
111 greg 1.11 break;
112     case 'b': /* background */
113 greg 2.3 check(3,NULL);
114 greg 1.25 fillo = F_BACK;
115 greg 1.11 break;
116     case 'a': /* all */
117 greg 2.3 check(3,NULL);
118 greg 1.25 fillo = F_FORE|F_BACK;
119 greg 1.11 break;
120 greg 1.25 case 's': /* sample */
121 greg 2.3 check(3,"i");
122 greg 1.26 fillsamp = atoi(argv[++i]);
123 greg 1.25 break;
124 greg 1.11 case 'c': /* color */
125 greg 2.3 check(3,"fff");
126 greg 1.25 fillfunc = backfill;
127 greg 1.11 setcolr(backcolr, atof(argv[i+1]),
128     atof(argv[i+2]), atof(argv[i+3]));
129     i += 3;
130     break;
131 greg 1.13 case 'z': /* z value */
132 greg 2.3 check(3,"f");
133 greg 1.25 fillfunc = backfill;
134 greg 1.13 backz = atof(argv[++i]);
135     break;
136     case 'r': /* rtrace */
137 greg 2.3 check(3,"s");
138 greg 1.25 fillfunc = rcalfill;
139 greg 1.13 calstart(RTCOM, argv[++i]);
140     break;
141 greg 1.11 default:
142     goto badopt;
143     }
144     break;
145     case 'z': /* z file */
146 greg 2.3 check(2,"s");
147 greg 1.11 zfile = argv[++i];
148     break;
149 greg 1.6 case 'x': /* x resolution */
150 greg 2.3 check(2,"i");
151 greg 1.17 hresolu = atoi(argv[++i]);
152 greg 1.6 break;
153     case 'y': /* y resolution */
154 greg 2.3 check(2,"i");
155 greg 1.17 vresolu = atoi(argv[++i]);
156 greg 1.6 break;
157 greg 1.18 case 'p': /* pixel aspect */
158 greg 2.6 if (argv[i][2] != 'a')
159     goto badopt;
160     check(3,"f");
161 greg 1.18 pixaspect = atof(argv[++i]);
162     break;
163 greg 1.17 case 'v': /* view file */
164     if (argv[i][2] != 'f')
165 greg 1.1 goto badopt;
166 greg 2.3 check(3,"s");
167 greg 1.19 gotvfile = viewfile(argv[++i], &ourview, 0, 0);
168 greg 2.10 if (gotvfile < 0)
169     syserror(argv[i]);
170     else if (gotvfile == 0) {
171 greg 1.17 fprintf(stderr, "%s: bad view file\n",
172     argv[i]);
173     exit(1);
174 greg 1.1 }
175     break;
176     default:
177     badopt:
178 greg 1.10 fprintf(stderr, "%s: command line error at '%s'\n",
179 greg 1.1 progname, argv[i]);
180 greg 1.10 goto userr;
181 greg 1.1 }
182 greg 1.17 }
183 greg 1.1 /* check arguments */
184 greg 1.13 if ((argc-i)%2)
185 greg 1.10 goto userr;
186 greg 2.3 if (fillsamp == 1)
187     fillo &= ~F_BACK;
188 greg 1.1 /* set view */
189 greg 2.14 if (ourview.vaft > FTINY)
190     err = "no aft clipping plane allowed";
191     else
192     err = setview(&ourview);
193     if (err != NULL) {
194 greg 1.1 fprintf(stderr, "%s: %s\n", progname, err);
195     exit(1);
196     }
197 greg 1.18 normaspect(viewaspect(&ourview), &pixaspect, &hresolu, &vresolu);
198 greg 1.1 /* allocate frame */
199 greg 2.7 ourpict = (COLR *)bmalloc(hresolu*vresolu*sizeof(COLR));
200     ourzbuf = (float *)bmalloc(hresolu*vresolu*sizeof(float));
201 greg 1.15 if (ourpict == NULL || ourzbuf == NULL)
202 greg 2.10 syserror(progname);
203 greg 2.7 bzero((char *)ourzbuf, hresolu*vresolu*sizeof(float));
204 greg 2.13 /* new header */
205     newheader("RADIANCE", stdout);
206 greg 1.1 /* get input */
207     for ( ; i < argc; i += 2)
208     addpicture(argv[i], argv[i+1]);
209     /* fill in spaces */
210 greg 1.25 if (fillo&F_BACK)
211 greg 1.26 backpicture(fillfunc, fillsamp);
212 greg 1.12 else
213 greg 1.25 fillpicture(fillfunc);
214 greg 1.13 /* close calculation */
215 greg 1.14 caldone();
216 greg 1.1 /* add to header */
217     printargs(argc, argv, stdout);
218     if (gotvfile) {
219 greg 1.25 fputs(VIEWSTR, stdout);
220 greg 1.1 fprintview(&ourview, stdout);
221 greg 1.25 putc('\n', stdout);
222 greg 1.1 }
223 greg 1.18 if (pixaspect < .99 || pixaspect > 1.01)
224     fputaspect(pixaspect, stdout);
225     if (ourexp > 0 && (ourexp < .995 || ourexp > 1.005))
226 greg 1.16 fputexpos(ourexp, stdout);
227 greg 1.33 fputformat(COLRFMT, stdout);
228 greg 1.25 putc('\n', stdout);
229 greg 1.11 /* write picture */
230 greg 1.1 writepicture();
231 greg 1.11 /* write z file */
232     if (zfile != NULL)
233     writedistance(zfile);
234 greg 1.1
235     exit(0);
236 greg 1.10 userr:
237     fprintf(stderr,
238 greg 1.17 "Usage: %s [view opts][-t eps][-z zout][-fT][-n] pfile zspec ..\n",
239 greg 1.10 progname);
240     exit(1);
241 greg 1.1 #undef check
242     }
243    
244    
245     headline(s) /* process header string */
246     char *s;
247     {
248 greg 1.33 char fmt[32];
249 greg 1.1
250 greg 2.13 if (isheadid(s))
251     return;
252     if (formatval(fmt, s)) {
253 greg 1.33 wrongformat = strcmp(fmt, COLRFMT);
254     return;
255     }
256 greg 1.25 putc('\t', stdout);
257     fputs(s, stdout);
258 greg 1.1
259 greg 1.16 if (isexpos(s)) {
260     theirexp *= exposval(s);
261     return;
262     }
263 greg 2.5 if (isview(s) && sscanview(&theirview, s) > 0)
264     gotview++;
265 greg 1.1 }
266    
267    
268 greg 1.10 addpicture(pfile, zspec) /* add picture to output */
269     char *pfile, *zspec;
270 greg 1.1 {
271 greg 1.19 FILE *pfp;
272     int zfd;
273 greg 1.8 char *err;
274 greg 1.1 COLR *scanin;
275 greg 1.15 float *zin;
276     struct position *plast;
277 greg 1.1 int y;
278 greg 1.10 /* open picture file */
279 greg 2.10 if ((pfp = fopen(pfile, "r")) == NULL)
280     syserror(pfile);
281 greg 1.16 /* get header with exposure and view */
282     theirexp = 1.0;
283     gotview = 0;
284 greg 1.1 printf("%s:\n", pfile);
285 greg 1.33 getheader(pfp, headline, NULL);
286 greg 1.34 if (wrongformat || !gotview || !fgetsresolu(&tresolu, pfp)) {
287 greg 1.33 fprintf(stderr, "%s: picture format error\n", pfile);
288 greg 1.1 exit(1);
289     }
290 greg 1.16 if (ourexp <= 0)
291     ourexp = theirexp;
292     else if (ABS(theirexp-ourexp) > .01*ourexp)
293     fprintf(stderr, "%s: different exposure (warning)\n", pfile);
294 greg 1.1 if (err = setview(&theirview)) {
295     fprintf(stderr, "%s: %s\n", pfile, err);
296     exit(1);
297     }
298 greg 1.5 /* compute transformation */
299 greg 1.30 hasmatrix = pixform(theirs2ours, &theirview, &ourview);
300 greg 1.1 /* allocate scanlines */
301 greg 1.34 scanin = (COLR *)malloc(scanlen(&tresolu)*sizeof(COLR));
302     zin = (float *)malloc(scanlen(&tresolu)*sizeof(float));
303     plast = (struct position *)calloc(scanlen(&tresolu),
304     sizeof(struct position));
305 greg 1.15 if (scanin == NULL || zin == NULL || plast == NULL)
306 greg 2.10 syserror(progname);
307 greg 1.10 /* get z specification or file */
308 greg 1.19 if ((zfd = open(zspec, O_RDONLY)) == -1) {
309 greg 1.10 double zvalue;
310     register int x;
311 greg 2.10 if (!isfloat(zspec) || (zvalue = atof(zspec)) <= 0.0)
312     syserror(zspec);
313 greg 1.34 for (x = scanlen(&tresolu); x-- > 0; )
314 greg 1.10 zin[x] = zvalue;
315     }
316 greg 1.1 /* load image */
317 greg 1.34 for (y = 0; y < numscans(&tresolu); y++) {
318     if (freadcolrs(scanin, scanlen(&tresolu), pfp) < 0) {
319 greg 1.1 fprintf(stderr, "%s: read error\n", pfile);
320     exit(1);
321     }
322 greg 1.34 if (zfd != -1 && read(zfd,(char *)zin,
323     scanlen(&tresolu)*sizeof(float))
324     < scanlen(&tresolu)*sizeof(float)) {
325 greg 1.10 fprintf(stderr, "%s: read error\n", zspec);
326 greg 1.1 exit(1);
327     }
328 greg 1.15 addscanline(y, scanin, zin, plast);
329 greg 1.1 }
330     /* clean up */
331     free((char *)scanin);
332     free((char *)zin);
333 greg 1.9 free((char *)plast);
334 greg 1.1 fclose(pfp);
335 greg 1.19 if (zfd != -1)
336     close(zfd);
337 greg 1.1 }
338    
339    
340 greg 1.5 pixform(xfmat, vw1, vw2) /* compute view1 to view2 matrix */
341     register double xfmat[4][4];
342     register VIEW *vw1, *vw2;
343     {
344     double m4t[4][4];
345    
346 greg 1.30 if (vw1->type != VT_PER && vw1->type != VT_PAR)
347     return(0);
348     if (vw2->type != VT_PER && vw2->type != VT_PAR)
349     return(0);
350 greg 1.5 setident4(xfmat);
351 greg 1.17 xfmat[0][0] = vw1->hvec[0];
352     xfmat[0][1] = vw1->hvec[1];
353     xfmat[0][2] = vw1->hvec[2];
354     xfmat[1][0] = vw1->vvec[0];
355     xfmat[1][1] = vw1->vvec[1];
356     xfmat[1][2] = vw1->vvec[2];
357 greg 1.5 xfmat[2][0] = vw1->vdir[0];
358     xfmat[2][1] = vw1->vdir[1];
359     xfmat[2][2] = vw1->vdir[2];
360     xfmat[3][0] = vw1->vp[0];
361     xfmat[3][1] = vw1->vp[1];
362     xfmat[3][2] = vw1->vp[2];
363     setident4(m4t);
364 greg 1.17 m4t[0][0] = vw2->hvec[0]/vw2->hn2;
365     m4t[1][0] = vw2->hvec[1]/vw2->hn2;
366     m4t[2][0] = vw2->hvec[2]/vw2->hn2;
367     m4t[3][0] = -DOT(vw2->vp,vw2->hvec)/vw2->hn2;
368     m4t[0][1] = vw2->vvec[0]/vw2->vn2;
369     m4t[1][1] = vw2->vvec[1]/vw2->vn2;
370     m4t[2][1] = vw2->vvec[2]/vw2->vn2;
371     m4t[3][1] = -DOT(vw2->vp,vw2->vvec)/vw2->vn2;
372 greg 1.5 m4t[0][2] = vw2->vdir[0];
373     m4t[1][2] = vw2->vdir[1];
374     m4t[2][2] = vw2->vdir[2];
375     m4t[3][2] = -DOT(vw2->vp,vw2->vdir);
376     multmat4(xfmat, xfmat, m4t);
377 greg 1.30 return(1);
378 greg 1.5 }
379    
380    
381 greg 1.15 addscanline(y, pline, zline, lasty) /* add scanline to output */
382 greg 1.1 int y;
383     COLR *pline;
384     float *zline;
385 greg 1.15 struct position *lasty; /* input/output */
386 greg 1.1 {
387 greg 1.30 FVECT pos;
388 greg 1.15 struct position lastx, newpos;
389 greg 1.1 register int x;
390    
391 greg 1.20 lastx.z = 0;
392 greg 1.34 for (x = scanlen(&tresolu); x-- > 0; ) {
393     pix2loc(pos, &tresolu, x, y);
394 greg 1.5 pos[2] = zline[x];
395 greg 1.30 if (movepixel(pos) < 0) {
396 greg 1.15 lasty[x].z = lastx.z = 0; /* mark invalid */
397 greg 1.1 continue;
398 greg 1.15 }
399 greg 1.17 newpos.x = pos[0] * hresolu;
400     newpos.y = pos[1] * vresolu;
401 greg 1.15 newpos.z = zline[x];
402 greg 1.8 /* add pixel to our image */
403 greg 1.17 if (pos[0] >= 0 && newpos.x < hresolu
404     && pos[1] >= 0 && newpos.y < vresolu) {
405 greg 1.15 addpixel(&newpos, &lastx, &lasty[x], pline[x], pos[2]);
406     lasty[x].x = lastx.x = newpos.x;
407     lasty[x].y = lastx.y = newpos.y;
408     lasty[x].z = lastx.z = newpos.z;
409     } else
410     lasty[x].z = lastx.z = 0; /* mark invalid */
411 greg 1.1 }
412     }
413    
414    
415 greg 1.15 addpixel(p0, p1, p2, pix, z) /* fill in pixel parallelogram */
416     struct position *p0, *p1, *p2;
417 greg 1.8 COLR pix;
418     double z;
419     {
420 greg 1.15 double zt = 2.*zeps*p0->z; /* threshold */
421     int s1x, s1y, s2x, s2y; /* step sizes */
422     int l1, l2, c1, c2; /* side lengths and counters */
423     int p1isy; /* p0p1 along y? */
424     int x1, y1; /* p1 position */
425     register int x, y; /* final position */
426    
427     /* compute vector p0p1 */
428 greg 1.25 if (fillo&F_FORE && ABS(p1->z-p0->z) <= zt) {
429 greg 1.15 s1x = p1->x - p0->x;
430     s1y = p1->y - p0->y;
431     l1 = ABS(s1x);
432     if (p1isy = (ABS(s1y) > l1))
433     l1 = ABS(s1y);
434     } else {
435     l1 = s1x = s1y = 1;
436     p1isy = -1;
437     }
438     /* compute vector p0p2 */
439 greg 1.25 if (fillo&F_FORE && ABS(p2->z-p0->z) <= zt) {
440 greg 1.15 s2x = p2->x - p0->x;
441     s2y = p2->y - p0->y;
442     if (p1isy == 1)
443     l2 = ABS(s2x);
444     else {
445     l2 = ABS(s2y);
446     if (p1isy != 0 && ABS(s2x) > l2)
447     l2 = ABS(s2x);
448     }
449     } else
450     l2 = s2x = s2y = 1;
451     /* fill the parallelogram */
452     for (c1 = l1; c1-- > 0; ) {
453     x1 = p0->x + c1*s1x/l1;
454     y1 = p0->y + c1*s1y/l1;
455     for (c2 = l2; c2-- > 0; ) {
456     x = x1 + c2*s2x/l2;
457 greg 1.28 if (x < 0 || x >= hresolu)
458     continue;
459 greg 1.15 y = y1 + c2*s2y/l2;
460 greg 1.28 if (y < 0 || y >= vresolu)
461     continue;
462 greg 1.15 if (zscan(y)[x] <= 0 || zscan(y)[x]-z
463     > zeps*zscan(y)[x]) {
464 greg 1.8 zscan(y)[x] = z;
465     copycolr(pscan(y)[x], pix);
466     }
467 greg 1.15 }
468     }
469 greg 1.30 }
470    
471    
472     movepixel(pos) /* reposition image point */
473     FVECT pos;
474     {
475     FVECT pt, direc;
476    
477 greg 1.32 if (pos[2] <= 0) /* empty pixel */
478     return(-1);
479 greg 1.30 if (hasmatrix) {
480     pos[0] += theirview.hoff - .5;
481     pos[1] += theirview.voff - .5;
482     if (theirview.type == VT_PER) {
483     if (normdist) /* adjust for eye-ray distance */
484     pos[2] /= sqrt( 1.
485     + pos[0]*pos[0]*theirview.hn2
486     + pos[1]*pos[1]*theirview.vn2 );
487     pos[0] *= pos[2];
488     pos[1] *= pos[2];
489     }
490     multp3(pos, pos, theirs2ours);
491     if (pos[2] <= 0)
492     return(-1);
493     if (ourview.type == VT_PER) {
494     pos[0] /= pos[2];
495     pos[1] /= pos[2];
496     }
497     pos[0] += .5 - ourview.hoff;
498     pos[1] += .5 - ourview.voff;
499     return(0);
500     }
501 greg 2.14 if (viewray(pt, direc, &theirview, pos[0], pos[1]) < -FTINY)
502 greg 1.30 return(-1);
503     pt[0] += direc[0]*pos[2];
504     pt[1] += direc[1]*pos[2];
505     pt[2] += direc[2]*pos[2];
506 greg 1.34 viewloc(pos, &ourview, pt);
507 greg 1.30 if (pos[2] <= 0)
508     return(-1);
509     return(0);
510 greg 1.8 }
511    
512    
513 greg 1.26 backpicture(fill, samp) /* background fill algorithm */
514 greg 1.25 int (*fill)();
515 greg 1.26 int samp;
516 greg 1.1 {
517 greg 1.2 int *yback, xback;
518 greg 1.1 int y;
519 greg 1.2 register int x, i;
520     /* get back buffer */
521 greg 1.17 yback = (int *)malloc(hresolu*sizeof(int));
522 greg 1.15 if (yback == NULL)
523 greg 2.10 syserror(progname);
524 greg 1.17 for (x = 0; x < hresolu; x++)
525 greg 1.4 yback[x] = -2;
526 greg 1.7 /*
527     * Xback and yback are the pixel locations of suitable
528     * background values in each direction.
529     * A value of -2 means unassigned, and -1 means
530     * that there is no suitable background in this direction.
531     */
532 greg 1.2 /* fill image */
533 greg 1.17 for (y = 0; y < vresolu; y++) {
534 greg 1.4 xback = -2;
535 greg 1.17 for (x = 0; x < hresolu; x++)
536 greg 1.8 if (zscan(y)[x] <= 0) { /* empty pixel */
537 greg 1.7 /*
538     * First, find background from above or below.
539     * (farthest assigned pixel)
540     */
541 greg 1.4 if (yback[x] == -2) {
542 greg 1.17 for (i = y+1; i < vresolu; i++)
543 greg 1.8 if (zscan(i)[x] > 0)
544 greg 1.4 break;
545 greg 1.17 if (i < vresolu
546 greg 1.2 && (y <= 0 || zscan(y-1)[x] < zscan(i)[x]))
547 greg 1.4 yback[x] = i;
548     else
549     yback[x] = y-1;
550 greg 1.2 }
551 greg 1.7 /*
552     * Next, find background from left or right.
553     */
554 greg 1.4 if (xback == -2) {
555 greg 1.17 for (i = x+1; i < hresolu; i++)
556 greg 1.8 if (zscan(y)[i] > 0)
557 greg 1.4 break;
558 greg 1.17 if (i < hresolu
559 greg 1.4 && (x <= 0 || zscan(y)[x-1] < zscan(y)[i]))
560     xback = i;
561     else
562     xback = x-1;
563     }
564 greg 1.7 /*
565 greg 1.26 * If we have no background for this pixel,
566     * use the given fill function.
567 greg 1.11 */
568 greg 1.27 if (xback < 0 && yback[x] < 0)
569     goto fillit;
570 greg 1.11 /*
571 greg 1.7 * Compare, and use the background that is
572     * farther, unless one of them is next to us.
573 greg 1.27 * If the background is too distant, call
574     * the fill function.
575 greg 1.7 */
576 greg 1.11 if ( yback[x] < 0
577     || (xback >= 0 && ABS(x-xback) <= 1)
578 greg 1.4 || ( ABS(y-yback[x]) > 1
579 greg 1.11 && zscan(yback[x])[x]
580 greg 1.13 < zscan(y)[xback] ) ) {
581 greg 1.27 if (samp > 0 && ABS(x-xback) >= samp)
582     goto fillit;
583 greg 1.4 copycolr(pscan(y)[x],pscan(y)[xback]);
584 greg 1.13 zscan(y)[x] = zscan(y)[xback];
585     } else {
586 greg 1.27 if (samp > 0 && ABS(y-yback[x]) > samp)
587     goto fillit;
588 greg 1.4 copycolr(pscan(y)[x],pscan(yback[x])[x]);
589 greg 1.13 zscan(y)[x] = zscan(yback[x])[x];
590 greg 1.27 }
591     continue;
592     fillit:
593     (*fill)(x,y);
594     if (fill == rcalfill) { /* use it */
595     clearqueue();
596     xback = x;
597     yback[x] = y;
598 greg 1.13 }
599 greg 1.4 } else { /* full pixel */
600     yback[x] = -2;
601     xback = -2;
602     }
603     }
604 greg 1.2 free((char *)yback);
605 greg 1.1 }
606    
607    
608 greg 1.25 fillpicture(fill) /* paint in empty pixels using fill */
609     int (*fill)();
610 greg 1.11 {
611     register int x, y;
612    
613 greg 1.17 for (y = 0; y < vresolu; y++)
614     for (x = 0; x < hresolu; x++)
615 greg 1.11 if (zscan(y)[x] <= 0)
616 greg 1.25 (*fill)(x,y);
617 greg 1.11 }
618    
619    
620 greg 1.1 writepicture() /* write out picture */
621     {
622     int y;
623    
624 greg 1.34 fprtresolu(hresolu, vresolu, stdout);
625 greg 1.17 for (y = vresolu-1; y >= 0; y--)
626     if (fwritecolrs(pscan(y), hresolu, stdout) < 0)
627 greg 2.10 syserror(progname);
628 greg 1.11 }
629    
630    
631     writedistance(fname) /* write out z file */
632     char *fname;
633     {
634     int donorm = normdist && ourview.type == VT_PER;
635 greg 1.19 int fd;
636 greg 1.11 int y;
637     float *zout;
638    
639 greg 2.10 if ((fd = open(fname, O_WRONLY|O_CREAT|O_TRUNC, 0666)) == -1)
640     syserror(fname);
641 greg 1.11 if (donorm
642 greg 1.17 && (zout = (float *)malloc(hresolu*sizeof(float))) == NULL)
643 greg 2.10 syserror(progname);
644 greg 1.17 for (y = vresolu-1; y >= 0; y--) {
645 greg 1.11 if (donorm) {
646     double vx, yzn2;
647     register int x;
648 greg 1.29 yzn2 = (y+.5)/vresolu + ourview.voff - .5;
649 greg 1.17 yzn2 = 1. + yzn2*yzn2*ourview.vn2;
650     for (x = 0; x < hresolu; x++) {
651 greg 1.29 vx = (x+.5)/hresolu + ourview.hoff - .5;
652 greg 1.11 zout[x] = zscan(y)[x]
653 greg 1.17 * sqrt(vx*vx*ourview.hn2 + yzn2);
654 greg 1.11 }
655     } else
656     zout = zscan(y);
657 greg 1.23 if (write(fd, (char *)zout, hresolu*sizeof(float))
658 greg 2.10 < hresolu*sizeof(float))
659     syserror(fname);
660 greg 1.11 }
661     if (donorm)
662     free((char *)zout);
663 greg 1.19 close(fd);
664 greg 1.10 }
665    
666    
667     isfloat(s) /* see if string is floating number */
668     register char *s;
669     {
670     for ( ; *s; s++)
671     if ((*s < '0' || *s > '9') && *s != '.' && *s != '-'
672     && *s != 'e' && *s != 'E' && *s != '+')
673     return(0);
674     return(1);
675 greg 1.12 }
676    
677    
678     backfill(x, y) /* fill pixel with background */
679     int x, y;
680     {
681     register BYTE *dest = pscan(y)[x];
682    
683     copycolr(dest, backcolr);
684 greg 1.13 zscan(y)[x] = backz;
685     }
686    
687    
688 greg 2.3 calstart(prog, args) /* start fill calculation */
689 greg 1.13 char *prog, *args;
690     {
691     char combuf[512];
692 greg 2.3 char *argv[64];
693     int rval;
694     register char **wp, *cp;
695 greg 1.13
696 greg 1.14 if (childpid != -1) {
697     fprintf(stderr, "%s: too many calculations\n", progname);
698     exit(1);
699     }
700 greg 2.3 strcpy(combuf, prog);
701     strcat(combuf, args);
702     cp = combuf;
703     wp = argv;
704     for ( ; ; ) {
705 greg 2.11 while (isspace(*cp)) /* nullify spaces */
706     *cp++ = '\0';
707     if (!*cp) /* all done? */
708     break;
709     *wp++ = cp; /* add argument to list */
710     while (*++cp && !isspace(*cp))
711     ;
712 greg 2.3 }
713     *wp = NULL;
714     /* start process */
715     if ((rval = open_process(PDesc, argv)) < 0)
716 greg 2.10 syserror(progname);
717 greg 2.3 if (rval == 0) {
718     fprintf(stderr, "%s: command not found\n", argv[0]);
719     exit(1);
720 greg 1.13 }
721 greg 2.3 packsiz = rval/(6*sizeof(float)) - 1;
722     if (packsiz > PACKSIZ)
723     packsiz = PACKSIZ;
724 greg 1.13 queuesiz = 0;
725     }
726    
727    
728 greg 2.3 caldone() /* done with calculation */
729 greg 1.13 {
730 greg 1.14 if (childpid == -1)
731     return;
732 greg 1.25 clearqueue();
733 greg 2.3 close_process(PDesc);
734 greg 1.14 childpid = -1;
735 greg 1.13 }
736    
737    
738 greg 1.14 rcalfill(x, y) /* fill with ray-calculated pixel */
739 greg 1.13 int x, y;
740     {
741 greg 2.3 if (queuesiz >= packsiz) /* flush queue if needed */
742 greg 1.25 clearqueue();
743 greg 1.22 /* add position to queue */
744 greg 1.13 queue[queuesiz][0] = x;
745     queue[queuesiz][1] = y;
746     queuesiz++;
747     }
748    
749    
750 greg 1.25 clearqueue() /* process queue */
751 greg 1.13 {
752 greg 1.22 FVECT orig, dir;
753 greg 2.3 float fbuf[6*(PACKSIZ+1)];
754     register float *fbp;
755 greg 1.13 register int i;
756    
757 greg 2.10 if (queuesiz == 0)
758     return;
759 greg 2.3 fbp = fbuf;
760 greg 1.13 for (i = 0; i < queuesiz; i++) {
761 greg 1.22 viewray(orig, dir, &ourview,
762     (queue[i][0]+.5)/hresolu,
763     (queue[i][1]+.5)/vresolu);
764 greg 2.3 *fbp++ = orig[0]; *fbp++ = orig[1]; *fbp++ = orig[2];
765     *fbp++ = dir[0]; *fbp++ = dir[1]; *fbp++ = dir[2];
766 greg 1.22 }
767 greg 2.3 /* mark end and get results */
768     bzero((char *)fbp, 6*sizeof(float));
769     if (process(PDesc, fbuf, fbuf, 4*sizeof(float)*queuesiz,
770     6*sizeof(float)*(queuesiz+1)) !=
771     4*sizeof(float)*queuesiz) {
772     fprintf(stderr, "%s: error reading from rtrace process\n",
773     progname);
774     exit(1);
775     }
776     fbp = fbuf;
777 greg 1.22 for (i = 0; i < queuesiz; i++) {
778 greg 1.16 if (ourexp > 0 && ourexp != 1.0) {
779 greg 2.3 fbp[0] *= ourexp;
780     fbp[1] *= ourexp;
781     fbp[2] *= ourexp;
782 greg 1.14 }
783 greg 1.13 setcolr(pscan(queue[i][1])[queue[i][0]],
784 greg 2.3 fbp[0], fbp[1], fbp[2]);
785     zscan(queue[i][1])[queue[i][0]] = fbp[3];
786     fbp += 4;
787 greg 1.13 }
788     queuesiz = 0;
789 greg 1.14 }
790    
791    
792 greg 2.10 syserror(s) /* report error and exit */
793     char *s;
794 greg 1.14 {
795 greg 2.10 perror(s);
796 greg 1.14 exit(1);
797 greg 1.1 }