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root/radiance/ray/src/px/pinterp.c
Revision: 2.7
Committed: Fri Jun 19 12:54:41 1992 UTC (31 years, 10 months ago) by greg
Content type: text/plain
Branch: MAIN
Changes since 2.6: +3 -2 lines
Log Message: 
changed malloc() call to bmalloc() for frame storage

File Contents

# User Rev Content
1 greg 1.34 /* Copyright (c) 1991 Regents of the University of California */
2    
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 1.24 #include <fcntl.h>
16 greg 1.19
17 greg 2.3 #include <ctype.h>
18    
19 greg 1.1 #include "view.h"
20    
21     #include "color.h"
22    
23 greg 1.34 #include "resolu.h"
24    
25 greg 1.21 #ifndef BSD
26     #define vfork fork
27     #endif
28    
29 greg 1.17 #define pscan(y) (ourpict+(y)*hresolu)
30     #define zscan(y) (ourzbuf+(y)*hresolu)
31 greg 1.1
32 greg 1.13 #define F_FORE 1 /* fill foreground */
33     #define F_BACK 2 /* fill background */
34 greg 1.11
35 greg 2.3 #define PACKSIZ 256 /* max. calculation packet size */
36 greg 1.13
37 greg 2.4 #define RTCOM "rtrace -h- -ovl -fff "
38 greg 1.13
39 greg 1.3 #define ABS(x) ((x)>0?(x):-(x))
40    
41 greg 1.15 struct position {int x,y; float z;};
42    
43 greg 1.17 VIEW ourview = STDVIEW; /* desired view */
44     int hresolu = 512; /* horizontal resolution */
45     int vresolu = 512; /* vertical resolution */
46 greg 1.18 double pixaspect = 1.0; /* pixel aspect ratio */
47 greg 1.1
48 greg 1.8 double zeps = .02; /* allowed z epsilon */
49 greg 1.1
50     COLR *ourpict; /* output picture */
51     float *ourzbuf; /* corresponding z-buffer */
52    
53     char *progname;
54    
55 greg 1.25 int fillo = F_FORE|F_BACK; /* selected fill options */
56 greg 1.26 int fillsamp = 0; /* sample separation (0 == inf) */
57 greg 1.14 extern int backfill(), rcalfill(); /* fill functions */
58 greg 1.25 int (*fillfunc)() = backfill; /* selected fill function */
59 greg 1.11 COLR backcolr = BLKCOLR; /* background color */
60 greg 1.13 double backz = 0.0; /* background z value */
61 greg 1.16 int normdist = 1; /* normalized distance? */
62     double ourexp = -1; /* output picture exposure */
63 greg 1.11
64 greg 1.17 VIEW theirview = STDVIEW; /* input view */
65 greg 1.16 int gotview; /* got input view? */
66 greg 1.33 int wrongformat = 0; /* input in another format? */
67 greg 1.34 RESOLU tresolu; /* input resolution */
68 greg 1.17 double theirexp; /* input picture exposure */
69 greg 1.5 double theirs2ours[4][4]; /* transformation matrix */
70 greg 1.30 int hasmatrix = 0; /* has transformation matrix */
71 greg 1.1
72 greg 2.3 int PDesc[3] = {-1,-1,-1}; /* rtrace process descriptor */
73     #define childpid (PDesc[2])
74     unsigned short queue[PACKSIZ][2]; /* pending pixels */
75     int packsiz; /* actual packet size */
76 greg 1.13 int queuesiz; /* number of pixels pending */
77 greg 1.5
78 greg 1.13
79 greg 1.1 main(argc, argv) /* interpolate pictures */
80     int argc;
81     char *argv[];
82     {
83 greg 2.3 #define check(ol,al) if (argv[i][ol] || \
84     badarg(argc-i-1,argv+i+1,al)) \
85     goto badopt
86 greg 1.1 int gotvfile = 0;
87 greg 1.11 char *zfile = NULL;
88 greg 1.1 char *err;
89 greg 1.17 int i, rval;
90 greg 1.1
91     progname = argv[0];
92    
93 greg 1.17 for (i = 1; i < argc && argv[i][0] == '-'; i++) {
94     rval = getviewopt(&ourview, argc-i, argv+i);
95     if (rval >= 0) {
96     i += rval;
97     continue;
98     }
99 greg 1.1 switch (argv[i][1]) {
100     case 't': /* threshold */
101 greg 2.3 check(2,"f");
102 greg 1.1 zeps = atof(argv[++i]);
103     break;
104 greg 1.11 case 'n': /* dist. normalized? */
105 greg 2.3 check(2,NULL);
106 greg 1.11 normdist = !normdist;
107 greg 1.10 break;
108 greg 1.11 case 'f': /* fill type */
109     switch (argv[i][2]) {
110     case '0': /* none */
111 greg 2.3 check(3,NULL);
112 greg 1.25 fillo = 0;
113 greg 1.11 break;
114     case 'f': /* foreground */
115 greg 2.3 check(3,NULL);
116 greg 1.25 fillo = F_FORE;
117 greg 1.11 break;
118     case 'b': /* background */
119 greg 2.3 check(3,NULL);
120 greg 1.25 fillo = F_BACK;
121 greg 1.11 break;
122     case 'a': /* all */
123 greg 2.3 check(3,NULL);
124 greg 1.25 fillo = F_FORE|F_BACK;
125 greg 1.11 break;
126 greg 1.25 case 's': /* sample */
127 greg 2.3 check(3,"i");
128 greg 1.26 fillsamp = atoi(argv[++i]);
129 greg 1.25 break;
130 greg 1.11 case 'c': /* color */
131 greg 2.3 check(3,"fff");
132 greg 1.25 fillfunc = backfill;
133 greg 1.11 setcolr(backcolr, atof(argv[i+1]),
134     atof(argv[i+2]), atof(argv[i+3]));
135     i += 3;
136     break;
137 greg 1.13 case 'z': /* z value */
138 greg 2.3 check(3,"f");
139 greg 1.25 fillfunc = backfill;
140 greg 1.13 backz = atof(argv[++i]);
141     break;
142     case 'r': /* rtrace */
143 greg 2.3 check(3,"s");
144 greg 1.25 fillfunc = rcalfill;
145 greg 1.13 calstart(RTCOM, argv[++i]);
146     break;
147 greg 1.11 default:
148     goto badopt;
149     }
150     break;
151     case 'z': /* z file */
152 greg 2.3 check(2,"s");
153 greg 1.11 zfile = argv[++i];
154     break;
155 greg 1.6 case 'x': /* x resolution */
156 greg 2.3 check(2,"i");
157 greg 1.17 hresolu = atoi(argv[++i]);
158 greg 1.6 break;
159     case 'y': /* y resolution */
160 greg 2.3 check(2,"i");
161 greg 1.17 vresolu = atoi(argv[++i]);
162 greg 1.6 break;
163 greg 1.18 case 'p': /* pixel aspect */
164 greg 2.6 if (argv[i][2] != 'a')
165     goto badopt;
166     check(3,"f");
167 greg 1.18 pixaspect = atof(argv[++i]);
168     break;
169 greg 1.17 case 'v': /* view file */
170     if (argv[i][2] != 'f')
171 greg 1.1 goto badopt;
172 greg 2.3 check(3,"s");
173 greg 1.19 gotvfile = viewfile(argv[++i], &ourview, 0, 0);
174 greg 1.17 if (gotvfile < 0) {
175     perror(argv[i]);
176     exit(1);
177     } else if (gotvfile == 0) {
178     fprintf(stderr, "%s: bad view file\n",
179     argv[i]);
180     exit(1);
181 greg 1.1 }
182     break;
183     default:
184     badopt:
185 greg 1.10 fprintf(stderr, "%s: command line error at '%s'\n",
186 greg 1.1 progname, argv[i]);
187 greg 1.10 goto userr;
188 greg 1.1 }
189 greg 1.17 }
190 greg 1.1 /* check arguments */
191 greg 1.13 if ((argc-i)%2)
192 greg 1.10 goto userr;
193 greg 2.3 if (fillsamp == 1)
194     fillo &= ~F_BACK;
195 greg 1.1 /* set view */
196     if (err = setview(&ourview)) {
197     fprintf(stderr, "%s: %s\n", progname, err);
198     exit(1);
199     }
200 greg 1.18 normaspect(viewaspect(&ourview), &pixaspect, &hresolu, &vresolu);
201 greg 1.1 /* allocate frame */
202 greg 2.7 ourpict = (COLR *)bmalloc(hresolu*vresolu*sizeof(COLR));
203     ourzbuf = (float *)bmalloc(hresolu*vresolu*sizeof(float));
204 greg 1.15 if (ourpict == NULL || ourzbuf == NULL)
205     syserror();
206 greg 2.7 bzero((char *)ourzbuf, hresolu*vresolu*sizeof(float));
207 greg 1.1 /* get input */
208     for ( ; i < argc; i += 2)
209     addpicture(argv[i], argv[i+1]);
210     /* fill in spaces */
211 greg 1.25 if (fillo&F_BACK)
212 greg 1.26 backpicture(fillfunc, fillsamp);
213 greg 1.12 else
214 greg 1.25 fillpicture(fillfunc);
215 greg 1.13 /* close calculation */
216 greg 1.14 caldone();
217 greg 1.1 /* add to header */
218     printargs(argc, argv, stdout);
219     if (gotvfile) {
220 greg 1.25 fputs(VIEWSTR, stdout);
221 greg 1.1 fprintview(&ourview, stdout);
222 greg 1.25 putc('\n', stdout);
223 greg 1.1 }
224 greg 1.18 if (pixaspect < .99 || pixaspect > 1.01)
225     fputaspect(pixaspect, stdout);
226     if (ourexp > 0 && (ourexp < .995 || ourexp > 1.005))
227 greg 1.16 fputexpos(ourexp, stdout);
228 greg 1.33 fputformat(COLRFMT, stdout);
229 greg 1.25 putc('\n', stdout);
230 greg 1.11 /* write picture */
231 greg 1.1 writepicture();
232 greg 1.11 /* write z file */
233     if (zfile != NULL)
234     writedistance(zfile);
235 greg 1.1
236     exit(0);
237 greg 1.10 userr:
238     fprintf(stderr,
239 greg 1.17 "Usage: %s [view opts][-t eps][-z zout][-fT][-n] pfile zspec ..\n",
240 greg 1.10 progname);
241     exit(1);
242 greg 1.1 #undef check
243     }
244    
245    
246     headline(s) /* process header string */
247     char *s;
248     {
249 greg 1.33 char fmt[32];
250 greg 1.1
251 greg 1.33 if (isformat(s)) {
252     formatval(fmt, s);
253     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 1.1 if ((pfp = fopen(pfile, "r")) == NULL) {
280     perror(pfile);
281     exit(1);
282     }
283 greg 1.16 /* get header with exposure and view */
284     theirexp = 1.0;
285     gotview = 0;
286 greg 1.1 printf("%s:\n", pfile);
287 greg 1.33 getheader(pfp, headline, NULL);
288 greg 1.34 if (wrongformat || !gotview || !fgetsresolu(&tresolu, pfp)) {
289 greg 1.33 fprintf(stderr, "%s: picture format error\n", pfile);
290 greg 1.1 exit(1);
291     }
292 greg 1.16 if (ourexp <= 0)
293     ourexp = theirexp;
294     else if (ABS(theirexp-ourexp) > .01*ourexp)
295     fprintf(stderr, "%s: different exposure (warning)\n", pfile);
296 greg 1.1 if (err = setview(&theirview)) {
297     fprintf(stderr, "%s: %s\n", pfile, err);
298     exit(1);
299     }
300 greg 1.5 /* compute transformation */
301 greg 1.30 hasmatrix = pixform(theirs2ours, &theirview, &ourview);
302 greg 1.1 /* allocate scanlines */
303 greg 1.34 scanin = (COLR *)malloc(scanlen(&tresolu)*sizeof(COLR));
304     zin = (float *)malloc(scanlen(&tresolu)*sizeof(float));
305     plast = (struct position *)calloc(scanlen(&tresolu),
306     sizeof(struct position));
307 greg 1.15 if (scanin == NULL || zin == NULL || plast == NULL)
308     syserror();
309 greg 1.10 /* get z specification or file */
310 greg 1.19 if ((zfd = open(zspec, O_RDONLY)) == -1) {
311 greg 1.10 double zvalue;
312     register int x;
313     if (!isfloat(zspec) || (zvalue = atof(zspec)) <= 0.0) {
314     perror(zspec);
315     exit(1);
316     }
317 greg 1.34 for (x = scanlen(&tresolu); x-- > 0; )
318 greg 1.10 zin[x] = zvalue;
319     }
320 greg 1.1 /* load image */
321 greg 1.34 for (y = 0; y < numscans(&tresolu); y++) {
322     if (freadcolrs(scanin, scanlen(&tresolu), pfp) < 0) {
323 greg 1.1 fprintf(stderr, "%s: read error\n", pfile);
324     exit(1);
325     }
326 greg 1.34 if (zfd != -1 && read(zfd,(char *)zin,
327     scanlen(&tresolu)*sizeof(float))
328     < scanlen(&tresolu)*sizeof(float)) {
329 greg 1.10 fprintf(stderr, "%s: read error\n", zspec);
330 greg 1.1 exit(1);
331     }
332 greg 1.15 addscanline(y, scanin, zin, plast);
333 greg 1.1 }
334     /* clean up */
335     free((char *)scanin);
336     free((char *)zin);
337 greg 1.9 free((char *)plast);
338 greg 1.1 fclose(pfp);
339 greg 1.19 if (zfd != -1)
340     close(zfd);
341 greg 1.1 }
342    
343    
344 greg 1.5 pixform(xfmat, vw1, vw2) /* compute view1 to view2 matrix */
345     register double xfmat[4][4];
346     register VIEW *vw1, *vw2;
347     {
348     double m4t[4][4];
349    
350 greg 1.30 if (vw1->type != VT_PER && vw1->type != VT_PAR)
351     return(0);
352     if (vw2->type != VT_PER && vw2->type != VT_PAR)
353     return(0);
354 greg 1.5 setident4(xfmat);
355 greg 1.17 xfmat[0][0] = vw1->hvec[0];
356     xfmat[0][1] = vw1->hvec[1];
357     xfmat[0][2] = vw1->hvec[2];
358     xfmat[1][0] = vw1->vvec[0];
359     xfmat[1][1] = vw1->vvec[1];
360     xfmat[1][2] = vw1->vvec[2];
361 greg 1.5 xfmat[2][0] = vw1->vdir[0];
362     xfmat[2][1] = vw1->vdir[1];
363     xfmat[2][2] = vw1->vdir[2];
364     xfmat[3][0] = vw1->vp[0];
365     xfmat[3][1] = vw1->vp[1];
366     xfmat[3][2] = vw1->vp[2];
367     setident4(m4t);
368 greg 1.17 m4t[0][0] = vw2->hvec[0]/vw2->hn2;
369     m4t[1][0] = vw2->hvec[1]/vw2->hn2;
370     m4t[2][0] = vw2->hvec[2]/vw2->hn2;
371     m4t[3][0] = -DOT(vw2->vp,vw2->hvec)/vw2->hn2;
372     m4t[0][1] = vw2->vvec[0]/vw2->vn2;
373     m4t[1][1] = vw2->vvec[1]/vw2->vn2;
374     m4t[2][1] = vw2->vvec[2]/vw2->vn2;
375     m4t[3][1] = -DOT(vw2->vp,vw2->vvec)/vw2->vn2;
376 greg 1.5 m4t[0][2] = vw2->vdir[0];
377     m4t[1][2] = vw2->vdir[1];
378     m4t[2][2] = vw2->vdir[2];
379     m4t[3][2] = -DOT(vw2->vp,vw2->vdir);
380     multmat4(xfmat, xfmat, m4t);
381 greg 1.30 return(1);
382 greg 1.5 }
383    
384    
385 greg 1.15 addscanline(y, pline, zline, lasty) /* add scanline to output */
386 greg 1.1 int y;
387     COLR *pline;
388     float *zline;
389 greg 1.15 struct position *lasty; /* input/output */
390 greg 1.1 {
391 greg 1.11 extern double sqrt();
392 greg 1.30 FVECT pos;
393 greg 1.15 struct position lastx, newpos;
394 greg 1.1 register int x;
395    
396 greg 1.20 lastx.z = 0;
397 greg 1.34 for (x = scanlen(&tresolu); x-- > 0; ) {
398     pix2loc(pos, &tresolu, x, y);
399 greg 1.5 pos[2] = zline[x];
400 greg 1.30 if (movepixel(pos) < 0) {
401 greg 1.15 lasty[x].z = lastx.z = 0; /* mark invalid */
402 greg 1.1 continue;
403 greg 1.15 }
404 greg 1.17 newpos.x = pos[0] * hresolu;
405     newpos.y = pos[1] * vresolu;
406 greg 1.15 newpos.z = zline[x];
407 greg 1.8 /* add pixel to our image */
408 greg 1.17 if (pos[0] >= 0 && newpos.x < hresolu
409     && pos[1] >= 0 && newpos.y < vresolu) {
410 greg 1.15 addpixel(&newpos, &lastx, &lasty[x], pline[x], pos[2]);
411     lasty[x].x = lastx.x = newpos.x;
412     lasty[x].y = lastx.y = newpos.y;
413     lasty[x].z = lastx.z = newpos.z;
414     } else
415     lasty[x].z = lastx.z = 0; /* mark invalid */
416 greg 1.1 }
417     }
418    
419    
420 greg 1.15 addpixel(p0, p1, p2, pix, z) /* fill in pixel parallelogram */
421     struct position *p0, *p1, *p2;
422 greg 1.8 COLR pix;
423     double z;
424     {
425 greg 1.15 double zt = 2.*zeps*p0->z; /* threshold */
426     int s1x, s1y, s2x, s2y; /* step sizes */
427     int l1, l2, c1, c2; /* side lengths and counters */
428     int p1isy; /* p0p1 along y? */
429     int x1, y1; /* p1 position */
430     register int x, y; /* final position */
431    
432     /* compute vector p0p1 */
433 greg 1.25 if (fillo&F_FORE && ABS(p1->z-p0->z) <= zt) {
434 greg 1.15 s1x = p1->x - p0->x;
435     s1y = p1->y - p0->y;
436     l1 = ABS(s1x);
437     if (p1isy = (ABS(s1y) > l1))
438     l1 = ABS(s1y);
439     } else {
440     l1 = s1x = s1y = 1;
441     p1isy = -1;
442     }
443     /* compute vector p0p2 */
444 greg 1.25 if (fillo&F_FORE && ABS(p2->z-p0->z) <= zt) {
445 greg 1.15 s2x = p2->x - p0->x;
446     s2y = p2->y - p0->y;
447     if (p1isy == 1)
448     l2 = ABS(s2x);
449     else {
450     l2 = ABS(s2y);
451     if (p1isy != 0 && ABS(s2x) > l2)
452     l2 = ABS(s2x);
453     }
454     } else
455     l2 = s2x = s2y = 1;
456     /* fill the parallelogram */
457     for (c1 = l1; c1-- > 0; ) {
458     x1 = p0->x + c1*s1x/l1;
459     y1 = p0->y + c1*s1y/l1;
460     for (c2 = l2; c2-- > 0; ) {
461     x = x1 + c2*s2x/l2;
462 greg 1.28 if (x < 0 || x >= hresolu)
463     continue;
464 greg 1.15 y = y1 + c2*s2y/l2;
465 greg 1.28 if (y < 0 || y >= vresolu)
466     continue;
467 greg 1.15 if (zscan(y)[x] <= 0 || zscan(y)[x]-z
468     > zeps*zscan(y)[x]) {
469 greg 1.8 zscan(y)[x] = z;
470     copycolr(pscan(y)[x], pix);
471     }
472 greg 1.15 }
473     }
474 greg 1.30 }
475    
476    
477     movepixel(pos) /* reposition image point */
478     FVECT pos;
479     {
480     FVECT pt, direc;
481    
482 greg 1.32 if (pos[2] <= 0) /* empty pixel */
483     return(-1);
484 greg 1.30 if (hasmatrix) {
485     pos[0] += theirview.hoff - .5;
486     pos[1] += theirview.voff - .5;
487     if (theirview.type == VT_PER) {
488     if (normdist) /* adjust for eye-ray distance */
489     pos[2] /= sqrt( 1.
490     + pos[0]*pos[0]*theirview.hn2
491     + pos[1]*pos[1]*theirview.vn2 );
492     pos[0] *= pos[2];
493     pos[1] *= pos[2];
494     }
495     multp3(pos, pos, theirs2ours);
496     if (pos[2] <= 0)
497     return(-1);
498     if (ourview.type == VT_PER) {
499     pos[0] /= pos[2];
500     pos[1] /= pos[2];
501     }
502     pos[0] += .5 - ourview.hoff;
503     pos[1] += .5 - ourview.voff;
504     return(0);
505     }
506     if (viewray(pt, direc, &theirview, pos[0], pos[1]) < 0)
507     return(-1);
508     pt[0] += direc[0]*pos[2];
509     pt[1] += direc[1]*pos[2];
510     pt[2] += direc[2]*pos[2];
511 greg 1.34 viewloc(pos, &ourview, pt);
512 greg 1.30 if (pos[2] <= 0)
513     return(-1);
514     return(0);
515 greg 1.8 }
516    
517    
518 greg 1.26 backpicture(fill, samp) /* background fill algorithm */
519 greg 1.25 int (*fill)();
520 greg 1.26 int samp;
521 greg 1.1 {
522 greg 1.2 int *yback, xback;
523 greg 1.1 int y;
524 greg 1.2 register int x, i;
525     /* get back buffer */
526 greg 1.17 yback = (int *)malloc(hresolu*sizeof(int));
527 greg 1.15 if (yback == NULL)
528     syserror();
529 greg 1.17 for (x = 0; x < hresolu; x++)
530 greg 1.4 yback[x] = -2;
531 greg 1.7 /*
532     * Xback and yback are the pixel locations of suitable
533     * background values in each direction.
534     * A value of -2 means unassigned, and -1 means
535     * that there is no suitable background in this direction.
536     */
537 greg 1.2 /* fill image */
538 greg 1.17 for (y = 0; y < vresolu; y++) {
539 greg 1.4 xback = -2;
540 greg 1.17 for (x = 0; x < hresolu; x++)
541 greg 1.8 if (zscan(y)[x] <= 0) { /* empty pixel */
542 greg 1.7 /*
543     * First, find background from above or below.
544     * (farthest assigned pixel)
545     */
546 greg 1.4 if (yback[x] == -2) {
547 greg 1.17 for (i = y+1; i < vresolu; i++)
548 greg 1.8 if (zscan(i)[x] > 0)
549 greg 1.4 break;
550 greg 1.17 if (i < vresolu
551 greg 1.2 && (y <= 0 || zscan(y-1)[x] < zscan(i)[x]))
552 greg 1.4 yback[x] = i;
553     else
554     yback[x] = y-1;
555 greg 1.2 }
556 greg 1.7 /*
557     * Next, find background from left or right.
558     */
559 greg 1.4 if (xback == -2) {
560 greg 1.17 for (i = x+1; i < hresolu; i++)
561 greg 1.8 if (zscan(y)[i] > 0)
562 greg 1.4 break;
563 greg 1.17 if (i < hresolu
564 greg 1.4 && (x <= 0 || zscan(y)[x-1] < zscan(y)[i]))
565     xback = i;
566     else
567     xback = x-1;
568     }
569 greg 1.7 /*
570 greg 1.26 * If we have no background for this pixel,
571     * use the given fill function.
572 greg 1.11 */
573 greg 1.27 if (xback < 0 && yback[x] < 0)
574     goto fillit;
575 greg 1.11 /*
576 greg 1.7 * Compare, and use the background that is
577     * farther, unless one of them is next to us.
578 greg 1.27 * If the background is too distant, call
579     * the fill function.
580 greg 1.7 */
581 greg 1.11 if ( yback[x] < 0
582     || (xback >= 0 && ABS(x-xback) <= 1)
583 greg 1.4 || ( ABS(y-yback[x]) > 1
584 greg 1.11 && zscan(yback[x])[x]
585 greg 1.13 < zscan(y)[xback] ) ) {
586 greg 1.27 if (samp > 0 && ABS(x-xback) >= samp)
587     goto fillit;
588 greg 1.4 copycolr(pscan(y)[x],pscan(y)[xback]);
589 greg 1.13 zscan(y)[x] = zscan(y)[xback];
590     } else {
591 greg 1.27 if (samp > 0 && ABS(y-yback[x]) > samp)
592     goto fillit;
593 greg 1.4 copycolr(pscan(y)[x],pscan(yback[x])[x]);
594 greg 1.13 zscan(y)[x] = zscan(yback[x])[x];
595 greg 1.27 }
596     continue;
597     fillit:
598     (*fill)(x,y);
599     if (fill == rcalfill) { /* use it */
600     clearqueue();
601     xback = x;
602     yback[x] = y;
603 greg 1.13 }
604 greg 1.4 } else { /* full pixel */
605     yback[x] = -2;
606     xback = -2;
607     }
608     }
609 greg 1.2 free((char *)yback);
610 greg 1.1 }
611    
612    
613 greg 1.25 fillpicture(fill) /* paint in empty pixels using fill */
614     int (*fill)();
615 greg 1.11 {
616     register int x, y;
617    
618 greg 1.17 for (y = 0; y < vresolu; y++)
619     for (x = 0; x < hresolu; x++)
620 greg 1.11 if (zscan(y)[x] <= 0)
621 greg 1.25 (*fill)(x,y);
622 greg 1.11 }
623    
624    
625 greg 1.1 writepicture() /* write out picture */
626     {
627     int y;
628    
629 greg 1.34 fprtresolu(hresolu, vresolu, stdout);
630 greg 1.17 for (y = vresolu-1; y >= 0; y--)
631     if (fwritecolrs(pscan(y), hresolu, stdout) < 0)
632 greg 1.15 syserror();
633 greg 1.11 }
634    
635    
636     writedistance(fname) /* write out z file */
637     char *fname;
638     {
639     extern double sqrt();
640     int donorm = normdist && ourview.type == VT_PER;
641 greg 1.19 int fd;
642 greg 1.11 int y;
643     float *zout;
644    
645 greg 1.19 if ((fd = open(fname, O_WRONLY|O_CREAT|O_TRUNC, 0666)) == -1) {
646 greg 1.11 perror(fname);
647     exit(1);
648     }
649     if (donorm
650 greg 1.17 && (zout = (float *)malloc(hresolu*sizeof(float))) == NULL)
651 greg 1.15 syserror();
652 greg 1.17 for (y = vresolu-1; y >= 0; y--) {
653 greg 1.11 if (donorm) {
654     double vx, yzn2;
655     register int x;
656 greg 1.29 yzn2 = (y+.5)/vresolu + ourview.voff - .5;
657 greg 1.17 yzn2 = 1. + yzn2*yzn2*ourview.vn2;
658     for (x = 0; x < hresolu; x++) {
659 greg 1.29 vx = (x+.5)/hresolu + ourview.hoff - .5;
660 greg 1.11 zout[x] = zscan(y)[x]
661 greg 1.17 * sqrt(vx*vx*ourview.hn2 + yzn2);
662 greg 1.11 }
663     } else
664     zout = zscan(y);
665 greg 1.23 if (write(fd, (char *)zout, hresolu*sizeof(float))
666 greg 1.19 < hresolu*sizeof(float)) {
667 greg 1.11 perror(fname);
668     exit(1);
669     }
670     }
671     if (donorm)
672     free((char *)zout);
673 greg 1.19 close(fd);
674 greg 1.10 }
675    
676    
677     isfloat(s) /* see if string is floating number */
678     register char *s;
679     {
680     for ( ; *s; s++)
681     if ((*s < '0' || *s > '9') && *s != '.' && *s != '-'
682     && *s != 'e' && *s != 'E' && *s != '+')
683     return(0);
684     return(1);
685 greg 1.12 }
686    
687    
688     backfill(x, y) /* fill pixel with background */
689     int x, y;
690     {
691     register BYTE *dest = pscan(y)[x];
692    
693     copycolr(dest, backcolr);
694 greg 1.13 zscan(y)[x] = backz;
695     }
696    
697    
698 greg 2.3 calstart(prog, args) /* start fill calculation */
699 greg 1.13 char *prog, *args;
700     {
701     char combuf[512];
702 greg 2.3 char *argv[64];
703     int rval;
704     register char **wp, *cp;
705 greg 1.13
706 greg 1.14 if (childpid != -1) {
707     fprintf(stderr, "%s: too many calculations\n", progname);
708     exit(1);
709     }
710 greg 2.3 strcpy(combuf, prog);
711     strcat(combuf, args);
712     cp = combuf;
713     wp = argv;
714     for ( ; ; ) {
715     while (isspace(*cp)) cp++;
716     if (!*cp) break;
717     *wp++ = cp;
718     while (!isspace(*cp))
719     if (!*cp++) goto done;
720     *cp++ = '\0';
721     }
722     done:
723     *wp = NULL;
724     /* start process */
725     if ((rval = open_process(PDesc, argv)) < 0)
726 greg 1.14 syserror();
727 greg 2.3 if (rval == 0) {
728     fprintf(stderr, "%s: command not found\n", argv[0]);
729     exit(1);
730 greg 1.13 }
731 greg 2.3 packsiz = rval/(6*sizeof(float)) - 1;
732     if (packsiz > PACKSIZ)
733     packsiz = PACKSIZ;
734 greg 1.13 queuesiz = 0;
735     }
736    
737    
738 greg 2.3 caldone() /* done with calculation */
739 greg 1.13 {
740 greg 1.14 if (childpid == -1)
741     return;
742 greg 1.25 clearqueue();
743 greg 2.3 close_process(PDesc);
744 greg 1.14 childpid = -1;
745 greg 1.13 }
746    
747    
748 greg 1.14 rcalfill(x, y) /* fill with ray-calculated pixel */
749 greg 1.13 int x, y;
750     {
751 greg 2.3 if (queuesiz >= packsiz) /* flush queue if needed */
752 greg 1.25 clearqueue();
753 greg 1.22 /* add position to queue */
754 greg 1.13 queue[queuesiz][0] = x;
755     queue[queuesiz][1] = y;
756     queuesiz++;
757     }
758    
759    
760 greg 1.25 clearqueue() /* process queue */
761 greg 1.13 {
762 greg 1.22 FVECT orig, dir;
763 greg 2.3 float fbuf[6*(PACKSIZ+1)];
764     register float *fbp;
765 greg 1.13 register int i;
766    
767 greg 2.3 fbp = fbuf;
768 greg 1.13 for (i = 0; i < queuesiz; i++) {
769 greg 1.22 viewray(orig, dir, &ourview,
770     (queue[i][0]+.5)/hresolu,
771     (queue[i][1]+.5)/vresolu);
772 greg 2.3 *fbp++ = orig[0]; *fbp++ = orig[1]; *fbp++ = orig[2];
773     *fbp++ = dir[0]; *fbp++ = dir[1]; *fbp++ = dir[2];
774 greg 1.22 }
775 greg 2.3 /* mark end and get results */
776     bzero((char *)fbp, 6*sizeof(float));
777     if (process(PDesc, fbuf, fbuf, 4*sizeof(float)*queuesiz,
778     6*sizeof(float)*(queuesiz+1)) !=
779     4*sizeof(float)*queuesiz) {
780     fprintf(stderr, "%s: error reading from rtrace process\n",
781     progname);
782     exit(1);
783     }
784     fbp = fbuf;
785 greg 1.22 for (i = 0; i < queuesiz; i++) {
786 greg 1.16 if (ourexp > 0 && ourexp != 1.0) {
787 greg 2.3 fbp[0] *= ourexp;
788     fbp[1] *= ourexp;
789     fbp[2] *= ourexp;
790 greg 1.14 }
791 greg 1.13 setcolr(pscan(queue[i][1])[queue[i][0]],
792 greg 2.3 fbp[0], fbp[1], fbp[2]);
793     zscan(queue[i][1])[queue[i][0]] = fbp[3];
794     fbp += 4;
795 greg 1.13 }
796     queuesiz = 0;
797 greg 1.14 }
798    
799    
800     syserror() /* report error and exit */
801     {
802     perror(progname);
803     exit(1);
804 greg 1.1 }