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root/radiance/ray/src/px/pinterp.c
Revision: 2.12
Committed: Mon Apr 12 09:58:09 1993 UTC (31 years ago) by greg
Content type: text/plain
Branch: MAIN
Changes since 2.11: +0 -1 lines
Log Message: 
fixed incomplete change

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