| 1 |
#ifndef lint |
| 2 |
static char SCCSid[] = "$SunId$ LBL"; |
| 3 |
#endif |
| 4 |
|
| 5 |
/* |
| 6 |
* Interpolate and extrapolate pictures with different view parameters. |
| 7 |
* |
| 8 |
* Greg Ward 09Dec89 |
| 9 |
*/ |
| 10 |
|
| 11 |
#include "standard.h" |
| 12 |
|
| 13 |
#include <fcntl.h> |
| 14 |
|
| 15 |
#include "view.h" |
| 16 |
|
| 17 |
#include "color.h" |
| 18 |
|
| 19 |
#include "random.h" |
| 20 |
|
| 21 |
#ifndef BSD |
| 22 |
#define vfork fork |
| 23 |
#endif |
| 24 |
|
| 25 |
#define pscan(y) (ourpict+(y)*hresolu) |
| 26 |
#define zscan(y) (ourzbuf+(y)*hresolu) |
| 27 |
|
| 28 |
#define PMASK 0xfffffff /* probability mask */ |
| 29 |
#define sampval(x) (long)((x)*(PMASK+1)+.5) |
| 30 |
#define samp(p) ((p) > (random()&PMASK)) |
| 31 |
|
| 32 |
#define F_FORE 1 /* fill foreground */ |
| 33 |
#define F_BACK 2 /* fill background */ |
| 34 |
|
| 35 |
#define PACKSIZ 42 /* calculation packet size */ |
| 36 |
|
| 37 |
#define RTCOM "rtrace -h -ovl -fff %s" |
| 38 |
|
| 39 |
#define ABS(x) ((x)>0?(x):-(x)) |
| 40 |
|
| 41 |
struct position {int x,y; float z;}; |
| 42 |
|
| 43 |
VIEW ourview = STDVIEW; /* desired view */ |
| 44 |
int hresolu = 512; /* horizontal resolution */ |
| 45 |
int vresolu = 512; /* vertical resolution */ |
| 46 |
double pixaspect = 1.0; /* pixel aspect ratio */ |
| 47 |
|
| 48 |
double zeps = .02; /* allowed z epsilon */ |
| 49 |
|
| 50 |
COLR *ourpict; /* output picture */ |
| 51 |
float *ourzbuf; /* corresponding z-buffer */ |
| 52 |
|
| 53 |
char *progname; |
| 54 |
|
| 55 |
int fillo = F_FORE|F_BACK; /* selected fill options */ |
| 56 |
long sampprob = 0; /* sample probability */ |
| 57 |
extern int backfill(), rcalfill(); /* fill functions */ |
| 58 |
int (*fillfunc)() = backfill; /* selected fill function */ |
| 59 |
COLR backcolr = BLKCOLR; /* background color */ |
| 60 |
double backz = 0.0; /* background z value */ |
| 61 |
int normdist = 1; /* normalized distance? */ |
| 62 |
double ourexp = -1; /* output picture exposure */ |
| 63 |
|
| 64 |
VIEW theirview = STDVIEW; /* input view */ |
| 65 |
int gotview; /* got input view? */ |
| 66 |
int thresolu, tvresolu; /* input resolution */ |
| 67 |
double theirexp; /* input picture exposure */ |
| 68 |
double theirs2ours[4][4]; /* transformation matrix */ |
| 69 |
|
| 70 |
int childpid = -1; /* id of fill process */ |
| 71 |
FILE *psend, *precv; /* pipes to/from fill calculation */ |
| 72 |
int queue[PACKSIZ][2]; /* pending pixels */ |
| 73 |
int queuesiz; /* number of pixels pending */ |
| 74 |
|
| 75 |
|
| 76 |
main(argc, argv) /* interpolate pictures */ |
| 77 |
int argc; |
| 78 |
char *argv[]; |
| 79 |
{ |
| 80 |
#define check(olen,narg) if (argv[i][olen] || narg >= argc-i) goto badopt |
| 81 |
extern double atof(); |
| 82 |
int gotvfile = 0; |
| 83 |
char *zfile = NULL; |
| 84 |
char *err; |
| 85 |
int i, rval; |
| 86 |
|
| 87 |
progname = argv[0]; |
| 88 |
|
| 89 |
for (i = 1; i < argc && argv[i][0] == '-'; i++) { |
| 90 |
rval = getviewopt(&ourview, argc-i, argv+i); |
| 91 |
if (rval >= 0) { |
| 92 |
i += rval; |
| 93 |
continue; |
| 94 |
} |
| 95 |
switch (argv[i][1]) { |
| 96 |
case 't': /* threshold */ |
| 97 |
check(2,1); |
| 98 |
zeps = atof(argv[++i]); |
| 99 |
break; |
| 100 |
case 'n': /* dist. normalized? */ |
| 101 |
check(2,0); |
| 102 |
normdist = !normdist; |
| 103 |
break; |
| 104 |
case 'f': /* fill type */ |
| 105 |
switch (argv[i][2]) { |
| 106 |
case '0': /* none */ |
| 107 |
check(3,0); |
| 108 |
fillo = 0; |
| 109 |
break; |
| 110 |
case 'f': /* foreground */ |
| 111 |
check(3,0); |
| 112 |
fillo = F_FORE; |
| 113 |
break; |
| 114 |
case 'b': /* background */ |
| 115 |
check(3,0); |
| 116 |
fillo = F_BACK; |
| 117 |
break; |
| 118 |
case 'a': /* all */ |
| 119 |
check(3,0); |
| 120 |
fillo = F_FORE|F_BACK; |
| 121 |
break; |
| 122 |
case 's': /* sample */ |
| 123 |
check(3,1); |
| 124 |
sampprob = sampval(atof(argv[++i])); |
| 125 |
break; |
| 126 |
case 'c': /* color */ |
| 127 |
check(3,3); |
| 128 |
fillfunc = backfill; |
| 129 |
setcolr(backcolr, atof(argv[i+1]), |
| 130 |
atof(argv[i+2]), atof(argv[i+3])); |
| 131 |
i += 3; |
| 132 |
break; |
| 133 |
case 'z': /* z value */ |
| 134 |
check(3,1); |
| 135 |
fillfunc = backfill; |
| 136 |
backz = atof(argv[++i]); |
| 137 |
break; |
| 138 |
case 'r': /* rtrace */ |
| 139 |
check(3,1); |
| 140 |
fillfunc = rcalfill; |
| 141 |
calstart(RTCOM, argv[++i]); |
| 142 |
break; |
| 143 |
default: |
| 144 |
goto badopt; |
| 145 |
} |
| 146 |
break; |
| 147 |
case 'z': /* z file */ |
| 148 |
check(2,1); |
| 149 |
zfile = argv[++i]; |
| 150 |
break; |
| 151 |
case 'x': /* x resolution */ |
| 152 |
check(2,1); |
| 153 |
hresolu = atoi(argv[++i]); |
| 154 |
break; |
| 155 |
case 'y': /* y resolution */ |
| 156 |
check(2,1); |
| 157 |
vresolu = atoi(argv[++i]); |
| 158 |
break; |
| 159 |
case 'p': /* pixel aspect */ |
| 160 |
check(2,1); |
| 161 |
pixaspect = atof(argv[++i]); |
| 162 |
break; |
| 163 |
case 'v': /* view file */ |
| 164 |
if (argv[i][2] != 'f') |
| 165 |
goto badopt; |
| 166 |
check(3,1); |
| 167 |
gotvfile = viewfile(argv[++i], &ourview, 0, 0); |
| 168 |
if (gotvfile < 0) { |
| 169 |
perror(argv[i]); |
| 170 |
exit(1); |
| 171 |
} else if (gotvfile == 0) { |
| 172 |
fprintf(stderr, "%s: bad view file\n", |
| 173 |
argv[i]); |
| 174 |
exit(1); |
| 175 |
} |
| 176 |
break; |
| 177 |
default: |
| 178 |
badopt: |
| 179 |
fprintf(stderr, "%s: command line error at '%s'\n", |
| 180 |
progname, argv[i]); |
| 181 |
goto userr; |
| 182 |
} |
| 183 |
} |
| 184 |
/* check arguments */ |
| 185 |
if ((argc-i)%2) |
| 186 |
goto userr; |
| 187 |
/* set view */ |
| 188 |
if (err = setview(&ourview)) { |
| 189 |
fprintf(stderr, "%s: %s\n", progname, err); |
| 190 |
exit(1); |
| 191 |
} |
| 192 |
normaspect(viewaspect(&ourview), &pixaspect, &hresolu, &vresolu); |
| 193 |
/* allocate frame */ |
| 194 |
ourpict = (COLR *)malloc(hresolu*vresolu*sizeof(COLR)); |
| 195 |
ourzbuf = (float *)calloc(hresolu*vresolu,sizeof(float)); |
| 196 |
if (ourpict == NULL || ourzbuf == NULL) |
| 197 |
syserror(); |
| 198 |
/* get input */ |
| 199 |
for ( ; i < argc; i += 2) |
| 200 |
addpicture(argv[i], argv[i+1]); |
| 201 |
/* fill in spaces */ |
| 202 |
if (fillo&F_BACK) |
| 203 |
backpicture(fillfunc, sampprob); |
| 204 |
else |
| 205 |
fillpicture(fillfunc); |
| 206 |
/* close calculation */ |
| 207 |
caldone(); |
| 208 |
/* add to header */ |
| 209 |
printargs(argc, argv, stdout); |
| 210 |
if (gotvfile) { |
| 211 |
fputs(VIEWSTR, stdout); |
| 212 |
fprintview(&ourview, stdout); |
| 213 |
putc('\n', stdout); |
| 214 |
} |
| 215 |
if (pixaspect < .99 || pixaspect > 1.01) |
| 216 |
fputaspect(pixaspect, stdout); |
| 217 |
if (ourexp > 0 && (ourexp < .995 || ourexp > 1.005)) |
| 218 |
fputexpos(ourexp, stdout); |
| 219 |
putc('\n', stdout); |
| 220 |
/* write picture */ |
| 221 |
writepicture(); |
| 222 |
/* write z file */ |
| 223 |
if (zfile != NULL) |
| 224 |
writedistance(zfile); |
| 225 |
|
| 226 |
exit(0); |
| 227 |
userr: |
| 228 |
fprintf(stderr, |
| 229 |
"Usage: %s [view opts][-t eps][-z zout][-fT][-n] pfile zspec ..\n", |
| 230 |
progname); |
| 231 |
exit(1); |
| 232 |
#undef check |
| 233 |
} |
| 234 |
|
| 235 |
|
| 236 |
headline(s) /* process header string */ |
| 237 |
char *s; |
| 238 |
{ |
| 239 |
static char *altname[] = {VIEWSTR,"rpict","rview","pinterp",NULL}; |
| 240 |
register char **an; |
| 241 |
|
| 242 |
putc('\t', stdout); |
| 243 |
fputs(s, stdout); |
| 244 |
|
| 245 |
if (isexpos(s)) { |
| 246 |
theirexp *= exposval(s); |
| 247 |
return; |
| 248 |
} |
| 249 |
for (an = altname; *an != NULL; an++) |
| 250 |
if (!strncmp(*an, s, strlen(*an))) { |
| 251 |
if (sscanview(&theirview, s+strlen(*an)) > 0) |
| 252 |
gotview++; |
| 253 |
break; |
| 254 |
} |
| 255 |
} |
| 256 |
|
| 257 |
|
| 258 |
addpicture(pfile, zspec) /* add picture to output */ |
| 259 |
char *pfile, *zspec; |
| 260 |
{ |
| 261 |
extern double atof(); |
| 262 |
FILE *pfp; |
| 263 |
int zfd; |
| 264 |
char *err; |
| 265 |
COLR *scanin; |
| 266 |
float *zin; |
| 267 |
struct position *plast; |
| 268 |
int y; |
| 269 |
/* open picture file */ |
| 270 |
if ((pfp = fopen(pfile, "r")) == NULL) { |
| 271 |
perror(pfile); |
| 272 |
exit(1); |
| 273 |
} |
| 274 |
/* get header with exposure and view */ |
| 275 |
theirexp = 1.0; |
| 276 |
gotview = 0; |
| 277 |
printf("%s:\n", pfile); |
| 278 |
getheader(pfp, headline); |
| 279 |
if (!gotview || fgetresolu(&thresolu, &tvresolu, pfp) |
| 280 |
!= (YMAJOR|YDECR)) { |
| 281 |
fprintf(stderr, "%s: picture view error\n", pfile); |
| 282 |
exit(1); |
| 283 |
} |
| 284 |
if (ourexp <= 0) |
| 285 |
ourexp = theirexp; |
| 286 |
else if (ABS(theirexp-ourexp) > .01*ourexp) |
| 287 |
fprintf(stderr, "%s: different exposure (warning)\n", pfile); |
| 288 |
if (err = setview(&theirview)) { |
| 289 |
fprintf(stderr, "%s: %s\n", pfile, err); |
| 290 |
exit(1); |
| 291 |
} |
| 292 |
/* compute transformation */ |
| 293 |
pixform(theirs2ours, &theirview, &ourview); |
| 294 |
/* allocate scanlines */ |
| 295 |
scanin = (COLR *)malloc(thresolu*sizeof(COLR)); |
| 296 |
zin = (float *)malloc(thresolu*sizeof(float)); |
| 297 |
plast = (struct position *)calloc(thresolu, sizeof(struct position)); |
| 298 |
if (scanin == NULL || zin == NULL || plast == NULL) |
| 299 |
syserror(); |
| 300 |
/* get z specification or file */ |
| 301 |
if ((zfd = open(zspec, O_RDONLY)) == -1) { |
| 302 |
double zvalue; |
| 303 |
register int x; |
| 304 |
if (!isfloat(zspec) || (zvalue = atof(zspec)) <= 0.0) { |
| 305 |
perror(zspec); |
| 306 |
exit(1); |
| 307 |
} |
| 308 |
for (x = 0; x < thresolu; x++) |
| 309 |
zin[x] = zvalue; |
| 310 |
} |
| 311 |
/* load image */ |
| 312 |
for (y = tvresolu-1; y >= 0; y--) { |
| 313 |
if (freadcolrs(scanin, thresolu, pfp) < 0) { |
| 314 |
fprintf(stderr, "%s: read error\n", pfile); |
| 315 |
exit(1); |
| 316 |
} |
| 317 |
if (zfd != -1 && read(zfd,(char *)zin,thresolu*sizeof(float)) |
| 318 |
< thresolu*sizeof(float)) { |
| 319 |
fprintf(stderr, "%s: read error\n", zspec); |
| 320 |
exit(1); |
| 321 |
} |
| 322 |
addscanline(y, scanin, zin, plast); |
| 323 |
} |
| 324 |
/* clean up */ |
| 325 |
free((char *)scanin); |
| 326 |
free((char *)zin); |
| 327 |
free((char *)plast); |
| 328 |
fclose(pfp); |
| 329 |
if (zfd != -1) |
| 330 |
close(zfd); |
| 331 |
} |
| 332 |
|
| 333 |
|
| 334 |
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 |
setident4(xfmat); |
| 341 |
xfmat[0][0] = vw1->hvec[0]; |
| 342 |
xfmat[0][1] = vw1->hvec[1]; |
| 343 |
xfmat[0][2] = vw1->hvec[2]; |
| 344 |
xfmat[1][0] = vw1->vvec[0]; |
| 345 |
xfmat[1][1] = vw1->vvec[1]; |
| 346 |
xfmat[1][2] = vw1->vvec[2]; |
| 347 |
xfmat[2][0] = vw1->vdir[0]; |
| 348 |
xfmat[2][1] = vw1->vdir[1]; |
| 349 |
xfmat[2][2] = vw1->vdir[2]; |
| 350 |
xfmat[3][0] = vw1->vp[0]; |
| 351 |
xfmat[3][1] = vw1->vp[1]; |
| 352 |
xfmat[3][2] = vw1->vp[2]; |
| 353 |
setident4(m4t); |
| 354 |
m4t[0][0] = vw2->hvec[0]/vw2->hn2; |
| 355 |
m4t[1][0] = vw2->hvec[1]/vw2->hn2; |
| 356 |
m4t[2][0] = vw2->hvec[2]/vw2->hn2; |
| 357 |
m4t[3][0] = -DOT(vw2->vp,vw2->hvec)/vw2->hn2; |
| 358 |
m4t[0][1] = vw2->vvec[0]/vw2->vn2; |
| 359 |
m4t[1][1] = vw2->vvec[1]/vw2->vn2; |
| 360 |
m4t[2][1] = vw2->vvec[2]/vw2->vn2; |
| 361 |
m4t[3][1] = -DOT(vw2->vp,vw2->vvec)/vw2->vn2; |
| 362 |
m4t[0][2] = vw2->vdir[0]; |
| 363 |
m4t[1][2] = vw2->vdir[1]; |
| 364 |
m4t[2][2] = vw2->vdir[2]; |
| 365 |
m4t[3][2] = -DOT(vw2->vp,vw2->vdir); |
| 366 |
multmat4(xfmat, xfmat, m4t); |
| 367 |
} |
| 368 |
|
| 369 |
|
| 370 |
addscanline(y, pline, zline, lasty) /* add scanline to output */ |
| 371 |
int y; |
| 372 |
COLR *pline; |
| 373 |
float *zline; |
| 374 |
struct position *lasty; /* input/output */ |
| 375 |
{ |
| 376 |
extern double sqrt(); |
| 377 |
double pos[3]; |
| 378 |
struct position lastx, newpos; |
| 379 |
register int x; |
| 380 |
|
| 381 |
lastx.z = 0; |
| 382 |
for (x = thresolu-1; x >= 0; x--) { |
| 383 |
pos[0] = (x+.5)/thresolu + theirview.hoff - .5; |
| 384 |
pos[1] = (y+.5)/tvresolu + theirview.voff - .5; |
| 385 |
pos[2] = zline[x]; |
| 386 |
if (theirview.type == VT_PER) { |
| 387 |
if (normdist) /* adjust for eye-ray distance */ |
| 388 |
pos[2] /= sqrt( 1. |
| 389 |
+ pos[0]*pos[0]*theirview.hn2 |
| 390 |
+ pos[1]*pos[1]*theirview.vn2 ); |
| 391 |
pos[0] *= pos[2]; |
| 392 |
pos[1] *= pos[2]; |
| 393 |
} |
| 394 |
multp3(pos, pos, theirs2ours); |
| 395 |
if (pos[2] <= 0) { |
| 396 |
lasty[x].z = lastx.z = 0; /* mark invalid */ |
| 397 |
continue; |
| 398 |
} |
| 399 |
if (ourview.type == VT_PER) { |
| 400 |
pos[0] /= pos[2]; |
| 401 |
pos[1] /= pos[2]; |
| 402 |
} |
| 403 |
pos[0] += .5 - ourview.hoff; |
| 404 |
pos[1] += .5 - ourview.voff; |
| 405 |
newpos.x = pos[0] * hresolu; |
| 406 |
newpos.y = pos[1] * vresolu; |
| 407 |
newpos.z = zline[x]; |
| 408 |
/* add pixel to our image */ |
| 409 |
if (pos[0] >= 0 && newpos.x < hresolu |
| 410 |
&& pos[1] >= 0 && newpos.y < vresolu) { |
| 411 |
addpixel(&newpos, &lastx, &lasty[x], pline[x], pos[2]); |
| 412 |
lasty[x].x = lastx.x = newpos.x; |
| 413 |
lasty[x].y = lastx.y = newpos.y; |
| 414 |
lasty[x].z = lastx.z = newpos.z; |
| 415 |
} else |
| 416 |
lasty[x].z = lastx.z = 0; /* mark invalid */ |
| 417 |
} |
| 418 |
} |
| 419 |
|
| 420 |
|
| 421 |
addpixel(p0, p1, p2, pix, z) /* fill in pixel parallelogram */ |
| 422 |
struct position *p0, *p1, *p2; |
| 423 |
COLR pix; |
| 424 |
double z; |
| 425 |
{ |
| 426 |
double zt = 2.*zeps*p0->z; /* threshold */ |
| 427 |
int s1x, s1y, s2x, s2y; /* step sizes */ |
| 428 |
int l1, l2, c1, c2; /* side lengths and counters */ |
| 429 |
int p1isy; /* p0p1 along y? */ |
| 430 |
int x1, y1; /* p1 position */ |
| 431 |
register int x, y; /* final position */ |
| 432 |
|
| 433 |
/* compute vector p0p1 */ |
| 434 |
if (fillo&F_FORE && ABS(p1->z-p0->z) <= zt) { |
| 435 |
s1x = p1->x - p0->x; |
| 436 |
s1y = p1->y - p0->y; |
| 437 |
l1 = ABS(s1x); |
| 438 |
if (p1isy = (ABS(s1y) > l1)) |
| 439 |
l1 = ABS(s1y); |
| 440 |
} else { |
| 441 |
l1 = s1x = s1y = 1; |
| 442 |
p1isy = -1; |
| 443 |
} |
| 444 |
/* compute vector p0p2 */ |
| 445 |
if (fillo&F_FORE && ABS(p2->z-p0->z) <= zt) { |
| 446 |
s2x = p2->x - p0->x; |
| 447 |
s2y = p2->y - p0->y; |
| 448 |
if (p1isy == 1) |
| 449 |
l2 = ABS(s2x); |
| 450 |
else { |
| 451 |
l2 = ABS(s2y); |
| 452 |
if (p1isy != 0 && ABS(s2x) > l2) |
| 453 |
l2 = ABS(s2x); |
| 454 |
} |
| 455 |
} else |
| 456 |
l2 = s2x = s2y = 1; |
| 457 |
/* fill the parallelogram */ |
| 458 |
for (c1 = l1; c1-- > 0; ) { |
| 459 |
x1 = p0->x + c1*s1x/l1; |
| 460 |
y1 = p0->y + c1*s1y/l1; |
| 461 |
for (c2 = l2; c2-- > 0; ) { |
| 462 |
x = x1 + c2*s2x/l2; |
| 463 |
y = y1 + c2*s2y/l2; |
| 464 |
if (zscan(y)[x] <= 0 || zscan(y)[x]-z |
| 465 |
> zeps*zscan(y)[x]) { |
| 466 |
zscan(y)[x] = z; |
| 467 |
copycolr(pscan(y)[x], pix); |
| 468 |
} |
| 469 |
} |
| 470 |
} |
| 471 |
} |
| 472 |
|
| 473 |
|
| 474 |
backpicture(fill, prob) /* background fill algorithm */ |
| 475 |
int (*fill)(); |
| 476 |
long prob; |
| 477 |
{ |
| 478 |
int *yback, xback; |
| 479 |
int y; |
| 480 |
COLR pfill; |
| 481 |
register int x, i; |
| 482 |
/* get back buffer */ |
| 483 |
yback = (int *)malloc(hresolu*sizeof(int)); |
| 484 |
if (yback == NULL) |
| 485 |
syserror(); |
| 486 |
for (x = 0; x < hresolu; x++) |
| 487 |
yback[x] = -2; |
| 488 |
/* |
| 489 |
* Xback and yback are the pixel locations of suitable |
| 490 |
* background values in each direction. |
| 491 |
* A value of -2 means unassigned, and -1 means |
| 492 |
* that there is no suitable background in this direction. |
| 493 |
*/ |
| 494 |
/* fill image */ |
| 495 |
for (y = 0; y < vresolu; y++) { |
| 496 |
xback = -2; |
| 497 |
for (x = 0; x < hresolu; x++) |
| 498 |
if (zscan(y)[x] <= 0) { /* empty pixel */ |
| 499 |
/* |
| 500 |
* First, find background from above or below. |
| 501 |
* (farthest assigned pixel) |
| 502 |
*/ |
| 503 |
if (yback[x] == -2) { |
| 504 |
for (i = y+1; i < vresolu; i++) |
| 505 |
if (zscan(i)[x] > 0) |
| 506 |
break; |
| 507 |
if (i < vresolu |
| 508 |
&& (y <= 0 || zscan(y-1)[x] < zscan(i)[x])) |
| 509 |
yback[x] = i; |
| 510 |
else |
| 511 |
yback[x] = y-1; |
| 512 |
} |
| 513 |
/* |
| 514 |
* Next, find background from left or right. |
| 515 |
*/ |
| 516 |
if (xback == -2) { |
| 517 |
for (i = x+1; i < hresolu; i++) |
| 518 |
if (zscan(y)[i] > 0) |
| 519 |
break; |
| 520 |
if (i < hresolu |
| 521 |
&& (x <= 0 || zscan(y)[x-1] < zscan(y)[i])) |
| 522 |
xback = i; |
| 523 |
else |
| 524 |
xback = x-1; |
| 525 |
} |
| 526 |
/* |
| 527 |
* Check to see if we have no background for |
| 528 |
* this pixel. If not, or sampling was |
| 529 |
* requested, use the given fill function. |
| 530 |
*/ |
| 531 |
if ((xback < 0 && yback[x] < 0) || samp(prob)) { |
| 532 |
(*fill)(x,y); |
| 533 |
continue; |
| 534 |
} |
| 535 |
/* |
| 536 |
* Compare, and use the background that is |
| 537 |
* farther, unless one of them is next to us. |
| 538 |
*/ |
| 539 |
if ( yback[x] < 0 |
| 540 |
|| (xback >= 0 && ABS(x-xback) <= 1) |
| 541 |
|| ( ABS(y-yback[x]) > 1 |
| 542 |
&& zscan(yback[x])[x] |
| 543 |
< zscan(y)[xback] ) ) { |
| 544 |
copycolr(pscan(y)[x],pscan(y)[xback]); |
| 545 |
zscan(y)[x] = zscan(y)[xback]; |
| 546 |
} else { |
| 547 |
copycolr(pscan(y)[x],pscan(yback[x])[x]); |
| 548 |
zscan(y)[x] = zscan(yback[x])[x]; |
| 549 |
} |
| 550 |
} else { /* full pixel */ |
| 551 |
yback[x] = -2; |
| 552 |
xback = -2; |
| 553 |
} |
| 554 |
} |
| 555 |
free((char *)yback); |
| 556 |
} |
| 557 |
|
| 558 |
|
| 559 |
fillpicture(fill) /* paint in empty pixels using fill */ |
| 560 |
int (*fill)(); |
| 561 |
{ |
| 562 |
register int x, y; |
| 563 |
|
| 564 |
for (y = 0; y < vresolu; y++) |
| 565 |
for (x = 0; x < hresolu; x++) |
| 566 |
if (zscan(y)[x] <= 0) |
| 567 |
(*fill)(x,y); |
| 568 |
} |
| 569 |
|
| 570 |
|
| 571 |
writepicture() /* write out picture */ |
| 572 |
{ |
| 573 |
int y; |
| 574 |
|
| 575 |
fputresolu(YMAJOR|YDECR, hresolu, vresolu, stdout); |
| 576 |
for (y = vresolu-1; y >= 0; y--) |
| 577 |
if (fwritecolrs(pscan(y), hresolu, stdout) < 0) |
| 578 |
syserror(); |
| 579 |
} |
| 580 |
|
| 581 |
|
| 582 |
writedistance(fname) /* write out z file */ |
| 583 |
char *fname; |
| 584 |
{ |
| 585 |
extern double sqrt(); |
| 586 |
int donorm = normdist && ourview.type == VT_PER; |
| 587 |
int fd; |
| 588 |
int y; |
| 589 |
float *zout; |
| 590 |
|
| 591 |
if ((fd = open(fname, O_WRONLY|O_CREAT|O_TRUNC, 0666)) == -1) { |
| 592 |
perror(fname); |
| 593 |
exit(1); |
| 594 |
} |
| 595 |
if (donorm |
| 596 |
&& (zout = (float *)malloc(hresolu*sizeof(float))) == NULL) |
| 597 |
syserror(); |
| 598 |
for (y = vresolu-1; y >= 0; y--) { |
| 599 |
if (donorm) { |
| 600 |
double vx, yzn2; |
| 601 |
register int x; |
| 602 |
yzn2 = y - .5*(vresolu-1); |
| 603 |
yzn2 = 1. + yzn2*yzn2*ourview.vn2; |
| 604 |
for (x = 0; x < hresolu; x++) { |
| 605 |
vx = x - .5*(hresolu-1); |
| 606 |
zout[x] = zscan(y)[x] |
| 607 |
* sqrt(vx*vx*ourview.hn2 + yzn2); |
| 608 |
} |
| 609 |
} else |
| 610 |
zout = zscan(y); |
| 611 |
if (write(fd, (char *)zout, hresolu*sizeof(float)) |
| 612 |
< hresolu*sizeof(float)) { |
| 613 |
perror(fname); |
| 614 |
exit(1); |
| 615 |
} |
| 616 |
} |
| 617 |
if (donorm) |
| 618 |
free((char *)zout); |
| 619 |
close(fd); |
| 620 |
} |
| 621 |
|
| 622 |
|
| 623 |
isfloat(s) /* see if string is floating number */ |
| 624 |
register char *s; |
| 625 |
{ |
| 626 |
for ( ; *s; s++) |
| 627 |
if ((*s < '0' || *s > '9') && *s != '.' && *s != '-' |
| 628 |
&& *s != 'e' && *s != 'E' && *s != '+') |
| 629 |
return(0); |
| 630 |
return(1); |
| 631 |
} |
| 632 |
|
| 633 |
|
| 634 |
backfill(x, y) /* fill pixel with background */ |
| 635 |
int x, y; |
| 636 |
{ |
| 637 |
register BYTE *dest = pscan(y)[x]; |
| 638 |
|
| 639 |
copycolr(dest, backcolr); |
| 640 |
zscan(y)[x] = backz; |
| 641 |
} |
| 642 |
|
| 643 |
|
| 644 |
calstart(prog, args) /* start fill calculation */ |
| 645 |
char *prog, *args; |
| 646 |
{ |
| 647 |
char combuf[512]; |
| 648 |
int p0[2], p1[2]; |
| 649 |
|
| 650 |
if (childpid != -1) { |
| 651 |
fprintf(stderr, "%s: too many calculations\n", progname); |
| 652 |
exit(1); |
| 653 |
} |
| 654 |
sprintf(combuf, prog, args); |
| 655 |
if (pipe(p0) < 0 || pipe(p1) < 0) |
| 656 |
syserror(); |
| 657 |
if ((childpid = vfork()) == 0) { /* fork calculation */ |
| 658 |
close(p0[1]); |
| 659 |
close(p1[0]); |
| 660 |
if (p0[0] != 0) { |
| 661 |
dup2(p0[0], 0); |
| 662 |
close(p0[0]); |
| 663 |
} |
| 664 |
if (p1[1] != 1) { |
| 665 |
dup2(p1[1], 1); |
| 666 |
close(p1[1]); |
| 667 |
} |
| 668 |
execl("/bin/sh", "sh", "-c", combuf, 0); |
| 669 |
perror("/bin/sh"); |
| 670 |
_exit(127); |
| 671 |
} |
| 672 |
if (childpid == -1) |
| 673 |
syserror(); |
| 674 |
close(p0[0]); |
| 675 |
close(p1[1]); |
| 676 |
if ((psend = fdopen(p0[1], "w")) == NULL) |
| 677 |
syserror(); |
| 678 |
if ((precv = fdopen(p1[0], "r")) == NULL) |
| 679 |
syserror(); |
| 680 |
queuesiz = 0; |
| 681 |
} |
| 682 |
|
| 683 |
|
| 684 |
caldone() /* done with calculation */ |
| 685 |
{ |
| 686 |
int pid; |
| 687 |
|
| 688 |
if (childpid == -1) |
| 689 |
return; |
| 690 |
clearqueue(); |
| 691 |
fclose(psend); |
| 692 |
fclose(precv); |
| 693 |
while ((pid = wait(0)) != -1 && pid != childpid) |
| 694 |
; |
| 695 |
childpid = -1; |
| 696 |
} |
| 697 |
|
| 698 |
|
| 699 |
rcalfill(x, y) /* fill with ray-calculated pixel */ |
| 700 |
int x, y; |
| 701 |
{ |
| 702 |
if (queuesiz >= PACKSIZ) /* flush queue if needed */ |
| 703 |
clearqueue(); |
| 704 |
/* add position to queue */ |
| 705 |
queue[queuesiz][0] = x; |
| 706 |
queue[queuesiz][1] = y; |
| 707 |
queuesiz++; |
| 708 |
} |
| 709 |
|
| 710 |
|
| 711 |
clearqueue() /* process queue */ |
| 712 |
{ |
| 713 |
FVECT orig, dir; |
| 714 |
float fbuf[6]; |
| 715 |
register int i; |
| 716 |
|
| 717 |
for (i = 0; i < queuesiz; i++) { |
| 718 |
viewray(orig, dir, &ourview, |
| 719 |
(queue[i][0]+.5)/hresolu, |
| 720 |
(queue[i][1]+.5)/vresolu); |
| 721 |
fbuf[0] = orig[0]; fbuf[1] = orig[1]; fbuf[2] = orig[2]; |
| 722 |
fbuf[3] = dir[0]; fbuf[4] = dir[1]; fbuf[5] = dir[2]; |
| 723 |
fwrite((char *)fbuf, sizeof(float), 6, psend); |
| 724 |
} |
| 725 |
/* flush output and get results */ |
| 726 |
fbuf[3] = fbuf[4] = fbuf[5] = 0.0; /* mark */ |
| 727 |
fwrite((char *)fbuf, sizeof(float), 6, psend); |
| 728 |
if (fflush(psend) == EOF) |
| 729 |
syserror(); |
| 730 |
for (i = 0; i < queuesiz; i++) { |
| 731 |
if (fread((char *)fbuf, sizeof(float), 4, precv) < 4) { |
| 732 |
fprintf(stderr, "%s: read error in clearqueue\n", |
| 733 |
progname); |
| 734 |
exit(1); |
| 735 |
} |
| 736 |
if (ourexp > 0 && ourexp != 1.0) { |
| 737 |
fbuf[0] *= ourexp; |
| 738 |
fbuf[1] *= ourexp; |
| 739 |
fbuf[2] *= ourexp; |
| 740 |
} |
| 741 |
setcolr(pscan(queue[i][1])[queue[i][0]], |
| 742 |
fbuf[0], fbuf[1], fbuf[2]); |
| 743 |
zscan(queue[i][1])[queue[i][0]] = fbuf[3]; |
| 744 |
} |
| 745 |
queuesiz = 0; |
| 746 |
} |
| 747 |
|
| 748 |
|
| 749 |
syserror() /* report error and exit */ |
| 750 |
{ |
| 751 |
perror(progname); |
| 752 |
exit(1); |
| 753 |
} |
