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root/radiance/ray/src/px/pinterp.c
Revision: 2.11
Committed: Fri Apr 2 09:10:48 1993 UTC (31 years, 1 month ago) by greg
Content type: text/plain
Branch: MAIN
Changes since 2.10: +7 -7 lines
Log Message: 
minor change in argument parsing in calstart()

File Contents

# User Rev Content
1 greg 2.10 /* Copyright (c) 1993 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     if (err = setview(&ourview)) {
190     fprintf(stderr, "%s: %s\n", progname, err);
191     exit(1);
192     }
193 greg 1.18 normaspect(viewaspect(&ourview), &pixaspect, &hresolu, &vresolu);
194 greg 1.1 /* allocate frame */
195 greg 2.7 ourpict = (COLR *)bmalloc(hresolu*vresolu*sizeof(COLR));
196     ourzbuf = (float *)bmalloc(hresolu*vresolu*sizeof(float));
197 greg 1.15 if (ourpict == NULL || ourzbuf == NULL)
198 greg 2.10 syserror(progname);
199 greg 2.7 bzero((char *)ourzbuf, hresolu*vresolu*sizeof(float));
200 greg 1.1 /* get input */
201     for ( ; i < argc; i += 2)
202     addpicture(argv[i], argv[i+1]);
203     /* fill in spaces */
204 greg 1.25 if (fillo&F_BACK)
205 greg 1.26 backpicture(fillfunc, fillsamp);
206 greg 1.12 else
207 greg 1.25 fillpicture(fillfunc);
208 greg 1.13 /* close calculation */
209 greg 1.14 caldone();
210 greg 1.1 /* add to header */
211     printargs(argc, argv, stdout);
212     if (gotvfile) {
213 greg 1.25 fputs(VIEWSTR, stdout);
214 greg 1.1 fprintview(&ourview, stdout);
215 greg 1.25 putc('\n', stdout);
216 greg 1.1 }
217 greg 1.18 if (pixaspect < .99 || pixaspect > 1.01)
218     fputaspect(pixaspect, stdout);
219     if (ourexp > 0 && (ourexp < .995 || ourexp > 1.005))
220 greg 1.16 fputexpos(ourexp, stdout);
221 greg 1.33 fputformat(COLRFMT, stdout);
222 greg 1.25 putc('\n', stdout);
223 greg 1.11 /* write picture */
224 greg 1.1 writepicture();
225 greg 1.11 /* write z file */
226     if (zfile != NULL)
227     writedistance(zfile);
228 greg 1.1
229     exit(0);
230 greg 1.10 userr:
231     fprintf(stderr,
232 greg 1.17 "Usage: %s [view opts][-t eps][-z zout][-fT][-n] pfile zspec ..\n",
233 greg 1.10 progname);
234     exit(1);
235 greg 1.1 #undef check
236     }
237    
238    
239     headline(s) /* process header string */
240     char *s;
241     {
242 greg 1.33 char fmt[32];
243 greg 1.1
244 greg 1.33 if (isformat(s)) {
245     formatval(fmt, s);
246     wrongformat = strcmp(fmt, COLRFMT);
247     return;
248     }
249 greg 1.25 putc('\t', stdout);
250     fputs(s, stdout);
251 greg 1.1
252 greg 1.16 if (isexpos(s)) {
253     theirexp *= exposval(s);
254     return;
255     }
256 greg 2.5 if (isview(s) && sscanview(&theirview, s) > 0)
257     gotview++;
258 greg 1.1 }
259    
260    
261 greg 1.10 addpicture(pfile, zspec) /* add picture to output */
262     char *pfile, *zspec;
263 greg 1.1 {
264 greg 1.19 FILE *pfp;
265     int zfd;
266 greg 1.8 char *err;
267 greg 1.1 COLR *scanin;
268 greg 1.15 float *zin;
269     struct position *plast;
270 greg 1.1 int y;
271 greg 1.10 /* open picture file */
272 greg 2.10 if ((pfp = fopen(pfile, "r")) == NULL)
273     syserror(pfile);
274 greg 1.16 /* get header with exposure and view */
275     theirexp = 1.0;
276     gotview = 0;
277 greg 1.1 printf("%s:\n", pfile);
278 greg 1.33 getheader(pfp, headline, NULL);
279 greg 1.34 if (wrongformat || !gotview || !fgetsresolu(&tresolu, pfp)) {
280 greg 1.33 fprintf(stderr, "%s: picture format error\n", pfile);
281 greg 1.1 exit(1);
282     }
283 greg 1.16 if (ourexp <= 0)
284     ourexp = theirexp;
285     else if (ABS(theirexp-ourexp) > .01*ourexp)
286     fprintf(stderr, "%s: different exposure (warning)\n", pfile);
287 greg 1.1 if (err = setview(&theirview)) {
288     fprintf(stderr, "%s: %s\n", pfile, err);
289     exit(1);
290     }
291 greg 1.5 /* compute transformation */
292 greg 1.30 hasmatrix = pixform(theirs2ours, &theirview, &ourview);
293 greg 1.1 /* allocate scanlines */
294 greg 1.34 scanin = (COLR *)malloc(scanlen(&tresolu)*sizeof(COLR));
295     zin = (float *)malloc(scanlen(&tresolu)*sizeof(float));
296     plast = (struct position *)calloc(scanlen(&tresolu),
297     sizeof(struct position));
298 greg 1.15 if (scanin == NULL || zin == NULL || plast == NULL)
299 greg 2.10 syserror(progname);
300 greg 1.10 /* get z specification or file */
301 greg 1.19 if ((zfd = open(zspec, O_RDONLY)) == -1) {
302 greg 1.10 double zvalue;
303     register int x;
304 greg 2.10 if (!isfloat(zspec) || (zvalue = atof(zspec)) <= 0.0)
305     syserror(zspec);
306 greg 1.10 exit(1);
307 greg 1.34 for (x = scanlen(&tresolu); x-- > 0; )
308 greg 1.10 zin[x] = zvalue;
309     }
310 greg 1.1 /* load image */
311 greg 1.34 for (y = 0; y < numscans(&tresolu); y++) {
312     if (freadcolrs(scanin, scanlen(&tresolu), pfp) < 0) {
313 greg 1.1 fprintf(stderr, "%s: read error\n", pfile);
314     exit(1);
315     }
316 greg 1.34 if (zfd != -1 && read(zfd,(char *)zin,
317     scanlen(&tresolu)*sizeof(float))
318     < scanlen(&tresolu)*sizeof(float)) {
319 greg 1.10 fprintf(stderr, "%s: read error\n", zspec);
320 greg 1.1 exit(1);
321     }
322 greg 1.15 addscanline(y, scanin, zin, plast);
323 greg 1.1 }
324     /* clean up */
325     free((char *)scanin);
326     free((char *)zin);
327 greg 1.9 free((char *)plast);
328 greg 1.1 fclose(pfp);
329 greg 1.19 if (zfd != -1)
330     close(zfd);
331 greg 1.1 }
332    
333    
334 greg 1.5 pixform(xfmat, vw1, vw2) /* compute view1 to view2 matrix */
335     register double xfmat[4][4];
336     register VIEW *vw1, *vw2;
337     {
338     double m4t[4][4];
339    
340 greg 1.30 if (vw1->type != VT_PER && vw1->type != VT_PAR)
341     return(0);
342     if (vw2->type != VT_PER && vw2->type != VT_PAR)
343     return(0);
344 greg 1.5 setident4(xfmat);
345 greg 1.17 xfmat[0][0] = vw1->hvec[0];
346     xfmat[0][1] = vw1->hvec[1];
347     xfmat[0][2] = vw1->hvec[2];
348     xfmat[1][0] = vw1->vvec[0];
349     xfmat[1][1] = vw1->vvec[1];
350     xfmat[1][2] = vw1->vvec[2];
351 greg 1.5 xfmat[2][0] = vw1->vdir[0];
352     xfmat[2][1] = vw1->vdir[1];
353     xfmat[2][2] = vw1->vdir[2];
354     xfmat[3][0] = vw1->vp[0];
355     xfmat[3][1] = vw1->vp[1];
356     xfmat[3][2] = vw1->vp[2];
357     setident4(m4t);
358 greg 1.17 m4t[0][0] = vw2->hvec[0]/vw2->hn2;
359     m4t[1][0] = vw2->hvec[1]/vw2->hn2;
360     m4t[2][0] = vw2->hvec[2]/vw2->hn2;
361     m4t[3][0] = -DOT(vw2->vp,vw2->hvec)/vw2->hn2;
362     m4t[0][1] = vw2->vvec[0]/vw2->vn2;
363     m4t[1][1] = vw2->vvec[1]/vw2->vn2;
364     m4t[2][1] = vw2->vvec[2]/vw2->vn2;
365     m4t[3][1] = -DOT(vw2->vp,vw2->vvec)/vw2->vn2;
366 greg 1.5 m4t[0][2] = vw2->vdir[0];
367     m4t[1][2] = vw2->vdir[1];
368     m4t[2][2] = vw2->vdir[2];
369     m4t[3][2] = -DOT(vw2->vp,vw2->vdir);
370     multmat4(xfmat, xfmat, m4t);
371 greg 1.30 return(1);
372 greg 1.5 }
373    
374    
375 greg 1.15 addscanline(y, pline, zline, lasty) /* add scanline to output */
376 greg 1.1 int y;
377     COLR *pline;
378     float *zline;
379 greg 1.15 struct position *lasty; /* input/output */
380 greg 1.1 {
381 greg 1.30 FVECT pos;
382 greg 1.15 struct position lastx, newpos;
383 greg 1.1 register int x;
384    
385 greg 1.20 lastx.z = 0;
386 greg 1.34 for (x = scanlen(&tresolu); x-- > 0; ) {
387     pix2loc(pos, &tresolu, x, y);
388 greg 1.5 pos[2] = zline[x];
389 greg 1.30 if (movepixel(pos) < 0) {
390 greg 1.15 lasty[x].z = lastx.z = 0; /* mark invalid */
391 greg 1.1 continue;
392 greg 1.15 }
393 greg 1.17 newpos.x = pos[0] * hresolu;
394     newpos.y = pos[1] * vresolu;
395 greg 1.15 newpos.z = zline[x];
396 greg 1.8 /* add pixel to our image */
397 greg 1.17 if (pos[0] >= 0 && newpos.x < hresolu
398     && pos[1] >= 0 && newpos.y < vresolu) {
399 greg 1.15 addpixel(&newpos, &lastx, &lasty[x], pline[x], pos[2]);
400     lasty[x].x = lastx.x = newpos.x;
401     lasty[x].y = lastx.y = newpos.y;
402     lasty[x].z = lastx.z = newpos.z;
403     } else
404     lasty[x].z = lastx.z = 0; /* mark invalid */
405 greg 1.1 }
406     }
407    
408    
409 greg 1.15 addpixel(p0, p1, p2, pix, z) /* fill in pixel parallelogram */
410     struct position *p0, *p1, *p2;
411 greg 1.8 COLR pix;
412     double z;
413     {
414 greg 1.15 double zt = 2.*zeps*p0->z; /* threshold */
415     int s1x, s1y, s2x, s2y; /* step sizes */
416     int l1, l2, c1, c2; /* side lengths and counters */
417     int p1isy; /* p0p1 along y? */
418     int x1, y1; /* p1 position */
419     register int x, y; /* final position */
420    
421     /* compute vector p0p1 */
422 greg 1.25 if (fillo&F_FORE && ABS(p1->z-p0->z) <= zt) {
423 greg 1.15 s1x = p1->x - p0->x;
424     s1y = p1->y - p0->y;
425     l1 = ABS(s1x);
426     if (p1isy = (ABS(s1y) > l1))
427     l1 = ABS(s1y);
428     } else {
429     l1 = s1x = s1y = 1;
430     p1isy = -1;
431     }
432     /* compute vector p0p2 */
433 greg 1.25 if (fillo&F_FORE && ABS(p2->z-p0->z) <= zt) {
434 greg 1.15 s2x = p2->x - p0->x;
435     s2y = p2->y - p0->y;
436     if (p1isy == 1)
437     l2 = ABS(s2x);
438     else {
439     l2 = ABS(s2y);
440     if (p1isy != 0 && ABS(s2x) > l2)
441     l2 = ABS(s2x);
442     }
443     } else
444     l2 = s2x = s2y = 1;
445     /* fill the parallelogram */
446     for (c1 = l1; c1-- > 0; ) {
447     x1 = p0->x + c1*s1x/l1;
448     y1 = p0->y + c1*s1y/l1;
449     for (c2 = l2; c2-- > 0; ) {
450     x = x1 + c2*s2x/l2;
451 greg 1.28 if (x < 0 || x >= hresolu)
452     continue;
453 greg 1.15 y = y1 + c2*s2y/l2;
454 greg 1.28 if (y < 0 || y >= vresolu)
455     continue;
456 greg 1.15 if (zscan(y)[x] <= 0 || zscan(y)[x]-z
457     > zeps*zscan(y)[x]) {
458 greg 1.8 zscan(y)[x] = z;
459     copycolr(pscan(y)[x], pix);
460     }
461 greg 1.15 }
462     }
463 greg 1.30 }
464    
465    
466     movepixel(pos) /* reposition image point */
467     FVECT pos;
468     {
469     FVECT pt, direc;
470    
471 greg 1.32 if (pos[2] <= 0) /* empty pixel */
472     return(-1);
473 greg 1.30 if (hasmatrix) {
474     pos[0] += theirview.hoff - .5;
475     pos[1] += theirview.voff - .5;
476     if (theirview.type == VT_PER) {
477     if (normdist) /* adjust for eye-ray distance */
478     pos[2] /= sqrt( 1.
479     + pos[0]*pos[0]*theirview.hn2
480     + pos[1]*pos[1]*theirview.vn2 );
481     pos[0] *= pos[2];
482     pos[1] *= pos[2];
483     }
484     multp3(pos, pos, theirs2ours);
485     if (pos[2] <= 0)
486     return(-1);
487     if (ourview.type == VT_PER) {
488     pos[0] /= pos[2];
489     pos[1] /= pos[2];
490     }
491     pos[0] += .5 - ourview.hoff;
492     pos[1] += .5 - ourview.voff;
493     return(0);
494     }
495     if (viewray(pt, direc, &theirview, pos[0], pos[1]) < 0)
496     return(-1);
497     pt[0] += direc[0]*pos[2];
498     pt[1] += direc[1]*pos[2];
499     pt[2] += direc[2]*pos[2];
500 greg 1.34 viewloc(pos, &ourview, pt);
501 greg 1.30 if (pos[2] <= 0)
502     return(-1);
503     return(0);
504 greg 1.8 }
505    
506    
507 greg 1.26 backpicture(fill, samp) /* background fill algorithm */
508 greg 1.25 int (*fill)();
509 greg 1.26 int samp;
510 greg 1.1 {
511 greg 1.2 int *yback, xback;
512 greg 1.1 int y;
513 greg 1.2 register int x, i;
514     /* get back buffer */
515 greg 1.17 yback = (int *)malloc(hresolu*sizeof(int));
516 greg 1.15 if (yback == NULL)
517 greg 2.10 syserror(progname);
518 greg 1.17 for (x = 0; x < hresolu; x++)
519 greg 1.4 yback[x] = -2;
520 greg 1.7 /*
521     * Xback and yback are the pixel locations of suitable
522     * background values in each direction.
523     * A value of -2 means unassigned, and -1 means
524     * that there is no suitable background in this direction.
525     */
526 greg 1.2 /* fill image */
527 greg 1.17 for (y = 0; y < vresolu; y++) {
528 greg 1.4 xback = -2;
529 greg 1.17 for (x = 0; x < hresolu; x++)
530 greg 1.8 if (zscan(y)[x] <= 0) { /* empty pixel */
531 greg 1.7 /*
532     * First, find background from above or below.
533     * (farthest assigned pixel)
534     */
535 greg 1.4 if (yback[x] == -2) {
536 greg 1.17 for (i = y+1; i < vresolu; i++)
537 greg 1.8 if (zscan(i)[x] > 0)
538 greg 1.4 break;
539 greg 1.17 if (i < vresolu
540 greg 1.2 && (y <= 0 || zscan(y-1)[x] < zscan(i)[x]))
541 greg 1.4 yback[x] = i;
542     else
543     yback[x] = y-1;
544 greg 1.2 }
545 greg 1.7 /*
546     * Next, find background from left or right.
547     */
548 greg 1.4 if (xback == -2) {
549 greg 1.17 for (i = x+1; i < hresolu; i++)
550 greg 1.8 if (zscan(y)[i] > 0)
551 greg 1.4 break;
552 greg 1.17 if (i < hresolu
553 greg 1.4 && (x <= 0 || zscan(y)[x-1] < zscan(y)[i]))
554     xback = i;
555     else
556     xback = x-1;
557     }
558 greg 1.7 /*
559 greg 1.26 * If we have no background for this pixel,
560     * use the given fill function.
561 greg 1.11 */
562 greg 1.27 if (xback < 0 && yback[x] < 0)
563     goto fillit;
564 greg 1.11 /*
565 greg 1.7 * Compare, and use the background that is
566     * farther, unless one of them is next to us.
567 greg 1.27 * If the background is too distant, call
568     * the fill function.
569 greg 1.7 */
570 greg 1.11 if ( yback[x] < 0
571     || (xback >= 0 && ABS(x-xback) <= 1)
572 greg 1.4 || ( ABS(y-yback[x]) > 1
573 greg 1.11 && zscan(yback[x])[x]
574 greg 1.13 < zscan(y)[xback] ) ) {
575 greg 1.27 if (samp > 0 && ABS(x-xback) >= samp)
576     goto fillit;
577 greg 1.4 copycolr(pscan(y)[x],pscan(y)[xback]);
578 greg 1.13 zscan(y)[x] = zscan(y)[xback];
579     } else {
580 greg 1.27 if (samp > 0 && ABS(y-yback[x]) > samp)
581     goto fillit;
582 greg 1.4 copycolr(pscan(y)[x],pscan(yback[x])[x]);
583 greg 1.13 zscan(y)[x] = zscan(yback[x])[x];
584 greg 1.27 }
585     continue;
586     fillit:
587     (*fill)(x,y);
588     if (fill == rcalfill) { /* use it */
589     clearqueue();
590     xback = x;
591     yback[x] = y;
592 greg 1.13 }
593 greg 1.4 } else { /* full pixel */
594     yback[x] = -2;
595     xback = -2;
596     }
597     }
598 greg 1.2 free((char *)yback);
599 greg 1.1 }
600    
601    
602 greg 1.25 fillpicture(fill) /* paint in empty pixels using fill */
603     int (*fill)();
604 greg 1.11 {
605     register int x, y;
606    
607 greg 1.17 for (y = 0; y < vresolu; y++)
608     for (x = 0; x < hresolu; x++)
609 greg 1.11 if (zscan(y)[x] <= 0)
610 greg 1.25 (*fill)(x,y);
611 greg 1.11 }
612    
613    
614 greg 1.1 writepicture() /* write out picture */
615     {
616     int y;
617    
618 greg 1.34 fprtresolu(hresolu, vresolu, stdout);
619 greg 1.17 for (y = vresolu-1; y >= 0; y--)
620     if (fwritecolrs(pscan(y), hresolu, stdout) < 0)
621 greg 2.10 syserror(progname);
622 greg 1.11 }
623    
624    
625     writedistance(fname) /* write out z file */
626     char *fname;
627     {
628     int donorm = normdist && ourview.type == VT_PER;
629 greg 1.19 int fd;
630 greg 1.11 int y;
631     float *zout;
632    
633 greg 2.10 if ((fd = open(fname, O_WRONLY|O_CREAT|O_TRUNC, 0666)) == -1)
634     syserror(fname);
635 greg 1.11 if (donorm
636 greg 1.17 && (zout = (float *)malloc(hresolu*sizeof(float))) == NULL)
637 greg 2.10 syserror(progname);
638 greg 1.17 for (y = vresolu-1; y >= 0; y--) {
639 greg 1.11 if (donorm) {
640     double vx, yzn2;
641     register int x;
642 greg 1.29 yzn2 = (y+.5)/vresolu + ourview.voff - .5;
643 greg 1.17 yzn2 = 1. + yzn2*yzn2*ourview.vn2;
644     for (x = 0; x < hresolu; x++) {
645 greg 1.29 vx = (x+.5)/hresolu + ourview.hoff - .5;
646 greg 1.11 zout[x] = zscan(y)[x]
647 greg 1.17 * sqrt(vx*vx*ourview.hn2 + yzn2);
648 greg 1.11 }
649     } else
650     zout = zscan(y);
651 greg 1.23 if (write(fd, (char *)zout, hresolu*sizeof(float))
652 greg 2.10 < hresolu*sizeof(float))
653     syserror(fname);
654 greg 1.11 }
655     if (donorm)
656     free((char *)zout);
657 greg 1.19 close(fd);
658 greg 1.10 }
659    
660    
661     isfloat(s) /* see if string is floating number */
662     register char *s;
663     {
664     for ( ; *s; s++)
665     if ((*s < '0' || *s > '9') && *s != '.' && *s != '-'
666     && *s != 'e' && *s != 'E' && *s != '+')
667     return(0);
668     return(1);
669 greg 1.12 }
670    
671    
672     backfill(x, y) /* fill pixel with background */
673     int x, y;
674     {
675     register BYTE *dest = pscan(y)[x];
676    
677     copycolr(dest, backcolr);
678 greg 1.13 zscan(y)[x] = backz;
679     }
680    
681    
682 greg 2.3 calstart(prog, args) /* start fill calculation */
683 greg 1.13 char *prog, *args;
684     {
685     char combuf[512];
686 greg 2.3 char *argv[64];
687     int rval;
688     register char **wp, *cp;
689 greg 1.13
690 greg 1.14 if (childpid != -1) {
691     fprintf(stderr, "%s: too many calculations\n", progname);
692     exit(1);
693     }
694 greg 2.3 strcpy(combuf, prog);
695     strcat(combuf, args);
696     cp = combuf;
697     wp = argv;
698     for ( ; ; ) {
699 greg 2.11 while (isspace(*cp)) /* nullify spaces */
700     *cp++ = '\0';
701     if (!*cp) /* all done? */
702     break;
703     *wp++ = cp; /* add argument to list */
704     while (*++cp && !isspace(*cp))
705     ;
706 greg 2.3 }
707     *wp = NULL;
708     /* start process */
709     if ((rval = open_process(PDesc, argv)) < 0)
710 greg 2.10 syserror(progname);
711 greg 2.3 if (rval == 0) {
712     fprintf(stderr, "%s: command not found\n", argv[0]);
713     exit(1);
714 greg 1.13 }
715 greg 2.3 packsiz = rval/(6*sizeof(float)) - 1;
716     if (packsiz > PACKSIZ)
717     packsiz = PACKSIZ;
718 greg 1.13 queuesiz = 0;
719     }
720    
721    
722 greg 2.3 caldone() /* done with calculation */
723 greg 1.13 {
724 greg 1.14 if (childpid == -1)
725     return;
726 greg 1.25 clearqueue();
727 greg 2.3 close_process(PDesc);
728 greg 1.14 childpid = -1;
729 greg 1.13 }
730    
731    
732 greg 1.14 rcalfill(x, y) /* fill with ray-calculated pixel */
733 greg 1.13 int x, y;
734     {
735 greg 2.3 if (queuesiz >= packsiz) /* flush queue if needed */
736 greg 1.25 clearqueue();
737 greg 1.22 /* add position to queue */
738 greg 1.13 queue[queuesiz][0] = x;
739     queue[queuesiz][1] = y;
740     queuesiz++;
741     }
742    
743    
744 greg 1.25 clearqueue() /* process queue */
745 greg 1.13 {
746 greg 1.22 FVECT orig, dir;
747 greg 2.3 float fbuf[6*(PACKSIZ+1)];
748     register float *fbp;
749 greg 1.13 register int i;
750    
751 greg 2.10 if (queuesiz == 0)
752     return;
753 greg 2.3 fbp = fbuf;
754 greg 1.13 for (i = 0; i < queuesiz; i++) {
755 greg 1.22 viewray(orig, dir, &ourview,
756     (queue[i][0]+.5)/hresolu,
757     (queue[i][1]+.5)/vresolu);
758 greg 2.3 *fbp++ = orig[0]; *fbp++ = orig[1]; *fbp++ = orig[2];
759     *fbp++ = dir[0]; *fbp++ = dir[1]; *fbp++ = dir[2];
760 greg 1.22 }
761 greg 2.3 /* mark end and get results */
762     bzero((char *)fbp, 6*sizeof(float));
763     if (process(PDesc, fbuf, fbuf, 4*sizeof(float)*queuesiz,
764     6*sizeof(float)*(queuesiz+1)) !=
765     4*sizeof(float)*queuesiz) {
766     fprintf(stderr, "%s: error reading from rtrace process\n",
767     progname);
768     exit(1);
769     }
770     fbp = fbuf;
771 greg 1.22 for (i = 0; i < queuesiz; i++) {
772 greg 1.16 if (ourexp > 0 && ourexp != 1.0) {
773 greg 2.3 fbp[0] *= ourexp;
774     fbp[1] *= ourexp;
775     fbp[2] *= ourexp;
776 greg 1.14 }
777 greg 1.13 setcolr(pscan(queue[i][1])[queue[i][0]],
778 greg 2.3 fbp[0], fbp[1], fbp[2]);
779     zscan(queue[i][1])[queue[i][0]] = fbp[3];
780     fbp += 4;
781 greg 1.13 }
782     queuesiz = 0;
783 greg 1.14 }
784    
785    
786 greg 2.10 syserror(s) /* report error and exit */
787     char *s;
788 greg 1.14 {
789 greg 2.10 perror(s);
790 greg 1.14 exit(1);
791 greg 1.1 }