| 17 |
|
#define pscan(y) (ourpict+(y)*ourview.hresolu) |
| 18 |
|
#define zscan(y) (ourzbuf+(y)*ourview.hresolu) |
| 19 |
|
|
| 20 |
< |
#define F_FORE 1 /* fill foreground */ |
| 21 |
< |
#define F_BACK 2 /* fill background */ |
| 20 |
> |
#define F_FORE 1 /* fill foreground */ |
| 21 |
> |
#define F_BACK 2 /* fill background */ |
| 22 |
|
|
| 23 |
+ |
#define PACKSIZ 42 /* calculation packet size */ |
| 24 |
+ |
|
| 25 |
+ |
#define RTCOM "rtrace -h -ovl -fff -x %d %s" |
| 26 |
+ |
|
| 27 |
|
#define ABS(x) ((x)>0?(x):-(x)) |
| 28 |
|
|
| 29 |
+ |
struct position {int x,y; float z;}; |
| 30 |
+ |
|
| 31 |
|
VIEW ourview = STDVIEW(512); /* desired view */ |
| 32 |
|
|
| 33 |
|
double zeps = .02; /* allowed z epsilon */ |
| 41 |
|
int gotview; /* got input view? */ |
| 42 |
|
|
| 43 |
|
int fill = F_FORE|F_BACK; /* selected fill algorithm */ |
| 44 |
< |
extern int backfill(); /* fill functions */ |
| 44 |
> |
extern int backfill(), rcalfill(); /* fill functions */ |
| 45 |
|
int (*deffill)() = backfill; /* selected fill function */ |
| 46 |
|
COLR backcolr = BLKCOLR; /* background color */ |
| 47 |
+ |
double backz = 0.0; /* background z value */ |
| 48 |
|
|
| 49 |
|
double theirs2ours[4][4]; /* transformation matrix */ |
| 50 |
|
int normdist = 1; /* normalized distance? */ |
| 51 |
|
|
| 52 |
+ |
int childpid = -1; /* id of fill process */ |
| 53 |
+ |
FILE *psend, *precv; /* pipes to/from fill calculation */ |
| 54 |
+ |
int queue[PACKSIZ][2]; /* pending pixels */ |
| 55 |
+ |
int queuesiz; /* number of pixels pending */ |
| 56 |
|
|
| 57 |
+ |
|
| 58 |
|
main(argc, argv) /* interpolate pictures */ |
| 59 |
|
int argc; |
| 60 |
|
char *argv[]; |
| 103 |
|
atof(argv[i+2]), atof(argv[i+3])); |
| 104 |
|
i += 3; |
| 105 |
|
break; |
| 106 |
+ |
case 'z': /* z value */ |
| 107 |
+ |
check(3,1); |
| 108 |
+ |
deffill = backfill; |
| 109 |
+ |
backz = atof(argv[++i]); |
| 110 |
+ |
break; |
| 111 |
+ |
case 'r': /* rtrace */ |
| 112 |
+ |
check(3,1); |
| 113 |
+ |
deffill = rcalfill; |
| 114 |
+ |
calstart(RTCOM, argv[++i]); |
| 115 |
+ |
break; |
| 116 |
|
default: |
| 117 |
|
goto badopt; |
| 118 |
|
} |
| 184 |
|
goto userr; |
| 185 |
|
} |
| 186 |
|
/* check arguments */ |
| 187 |
< |
if (argc-i < 2 || (argc-i)%2) |
| 187 |
> |
if ((argc-i)%2) |
| 188 |
|
goto userr; |
| 189 |
|
/* set view */ |
| 190 |
|
if (err = setview(&ourview)) { |
| 194 |
|
/* allocate frame */ |
| 195 |
|
ourpict = (COLR *)malloc(ourview.hresolu*ourview.vresolu*sizeof(COLR)); |
| 196 |
|
ourzbuf = (float *)calloc(ourview.hresolu*ourview.vresolu,sizeof(float)); |
| 197 |
< |
if (ourpict == NULL || ourzbuf == NULL) { |
| 198 |
< |
perror(progname); |
| 177 |
< |
exit(1); |
| 178 |
< |
} |
| 197 |
> |
if (ourpict == NULL || ourzbuf == NULL) |
| 198 |
> |
syserror(); |
| 199 |
|
/* get input */ |
| 200 |
|
for ( ; i < argc; i += 2) |
| 201 |
|
addpicture(argv[i], argv[i+1]); |
| 204 |
|
backpicture(); |
| 205 |
|
else |
| 206 |
|
fillpicture(); |
| 207 |
+ |
/* close calculation */ |
| 208 |
+ |
caldone(); |
| 209 |
|
/* add to header */ |
| 210 |
|
printargs(argc, argv, stdout); |
| 211 |
|
if (gotvfile) { |
| 254 |
|
FILE *pfp, *zfp; |
| 255 |
|
char *err; |
| 256 |
|
COLR *scanin; |
| 257 |
< |
float *zin, *zlast; |
| 258 |
< |
int *plast; |
| 257 |
> |
float *zin; |
| 258 |
> |
struct position *plast; |
| 259 |
|
int y; |
| 260 |
|
/* open picture file */ |
| 261 |
|
if ((pfp = fopen(pfile, "r")) == NULL) { |
| 280 |
|
/* allocate scanlines */ |
| 281 |
|
scanin = (COLR *)malloc(theirview.hresolu*sizeof(COLR)); |
| 282 |
|
zin = (float *)malloc(theirview.hresolu*sizeof(float)); |
| 283 |
< |
plast = (int *)calloc(theirview.hresolu, sizeof(int)); |
| 284 |
< |
zlast = (float *)calloc(theirview.hresolu, sizeof(float)); |
| 285 |
< |
if (scanin == NULL || zin == NULL || plast == NULL || zlast == NULL) { |
| 286 |
< |
perror(progname); |
| 265 |
< |
exit(1); |
| 266 |
< |
} |
| 283 |
> |
plast = (struct position *)calloc(theirview.hresolu, |
| 284 |
> |
sizeof(struct position)); |
| 285 |
> |
if (scanin == NULL || zin == NULL || plast == NULL) |
| 286 |
> |
syserror(); |
| 287 |
|
/* get z specification or file */ |
| 288 |
|
if ((zfp = fopen(zspec, "r")) == NULL) { |
| 289 |
|
double zvalue; |
| 307 |
|
fprintf(stderr, "%s: read error\n", zspec); |
| 308 |
|
exit(1); |
| 309 |
|
} |
| 310 |
< |
addscanline(y, scanin, zin, plast, zlast); |
| 310 |
> |
addscanline(y, scanin, zin, plast); |
| 311 |
|
} |
| 312 |
|
/* clean up */ |
| 313 |
|
free((char *)scanin); |
| 314 |
|
free((char *)zin); |
| 315 |
|
free((char *)plast); |
| 296 |
– |
free((char *)zlast); |
| 316 |
|
fclose(pfp); |
| 317 |
|
if (zfp != NULL) |
| 318 |
|
fclose(zfp); |
| 355 |
|
} |
| 356 |
|
|
| 357 |
|
|
| 358 |
< |
addscanline(y, pline, zline, lasty, lastyz) /* add scanline to output */ |
| 358 |
> |
addscanline(y, pline, zline, lasty) /* add scanline to output */ |
| 359 |
|
int y; |
| 360 |
|
COLR *pline; |
| 361 |
|
float *zline; |
| 362 |
< |
int *lasty; /* input/output */ |
| 344 |
< |
float *lastyz; /* input/output */ |
| 362 |
> |
struct position *lasty; /* input/output */ |
| 363 |
|
{ |
| 364 |
|
extern double sqrt(); |
| 365 |
|
double pos[3]; |
| 366 |
< |
int lastx = 0; |
| 349 |
< |
double lastxz = 0; |
| 350 |
< |
double zt; |
| 351 |
< |
int xpos, ypos; |
| 366 |
> |
struct position lastx, newpos; |
| 367 |
|
register int x; |
| 368 |
|
|
| 369 |
|
for (x = theirview.hresolu-1; x >= 0; x--) { |
| 379 |
|
pos[1] *= pos[2]; |
| 380 |
|
} |
| 381 |
|
multp3(pos, pos, theirs2ours); |
| 382 |
< |
if (pos[2] <= 0) |
| 382 |
> |
if (pos[2] <= 0) { |
| 383 |
> |
lasty[x].z = lastx.z = 0; /* mark invalid */ |
| 384 |
|
continue; |
| 385 |
+ |
} |
| 386 |
|
if (ourview.type == VT_PER) { |
| 387 |
|
pos[0] /= pos[2]; |
| 388 |
|
pos[1] /= pos[2]; |
| 389 |
|
} |
| 390 |
|
pos[0] += .5*ourview.hresolu; |
| 391 |
|
pos[1] += .5*ourview.vresolu; |
| 392 |
< |
if (pos[0] < 0 || (xpos = pos[0]) >= ourview.hresolu |
| 393 |
< |
|| pos[1] < 0 || (ypos = pos[1]) >= ourview.vresolu) |
| 394 |
< |
continue; |
| 392 |
> |
newpos.x = pos[0]; |
| 393 |
> |
newpos.y = pos[1]; |
| 394 |
> |
newpos.z = zline[x]; |
| 395 |
|
/* add pixel to our image */ |
| 396 |
< |
zt = 2.*zeps*zline[x]; |
| 397 |
< |
addpixel(xpos, ypos, |
| 398 |
< |
(fill&F_FORE && ABS(zline[x]-lastxz) <= zt) |
| 399 |
< |
? lastx - xpos : 1, |
| 400 |
< |
(fill&F_FORE && ABS(zline[x]-lastyz[x]) <= zt) |
| 401 |
< |
? lasty[x] - ypos : 1, |
| 402 |
< |
pline[x], pos[2]); |
| 403 |
< |
lastx = xpos; |
| 387 |
< |
lasty[x] = ypos; |
| 388 |
< |
lastxz = lastyz[x] = zline[x]; |
| 396 |
> |
if (pos[0] >= 0 && newpos.x < ourview.hresolu |
| 397 |
> |
&& pos[1] >= 0 && newpos.y < ourview.vresolu) { |
| 398 |
> |
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 |
|
} |
| 405 |
|
} |
| 406 |
|
|
| 407 |
|
|
| 408 |
< |
addpixel(xstart, ystart, width, height, pix, z) /* fill in area for pixel */ |
| 409 |
< |
int xstart, ystart; |
| 395 |
< |
int width, height; |
| 408 |
> |
addpixel(p0, p1, p2, pix, z) /* fill in pixel parallelogram */ |
| 409 |
> |
struct position *p0, *p1, *p2; |
| 410 |
|
COLR pix; |
| 411 |
|
double z; |
| 412 |
|
{ |
| 413 |
< |
register int x, y; |
| 414 |
< |
/* make width and height positive */ |
| 415 |
< |
if (width < 0) { |
| 416 |
< |
width = -width; |
| 417 |
< |
xstart = xstart-width+1; |
| 418 |
< |
} else if (width == 0) |
| 419 |
< |
width = 1; |
| 420 |
< |
if (height < 0) { |
| 421 |
< |
height = -height; |
| 422 |
< |
ystart = ystart-height+1; |
| 423 |
< |
} else if (height == 0) |
| 424 |
< |
height = 1; |
| 425 |
< |
/* fill pixel(s) within rectangle */ |
| 426 |
< |
for (y = ystart; y < ystart+height; y++) |
| 427 |
< |
for (x = xstart; x < xstart+width; x++) |
| 428 |
< |
if (zscan(y)[x] <= 0 |
| 429 |
< |
|| zscan(y)[x]-z > zeps*zscan(y)[x]) { |
| 413 |
> |
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 |
> |
if (fill&F_FORE && ABS(p1->z-p0->z) <= zt) { |
| 422 |
> |
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 |
> |
if (fill&F_FORE && ABS(p2->z-p0->z) <= zt) { |
| 433 |
> |
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 |
> |
y = y1 + c2*s2y/l2; |
| 451 |
> |
if (zscan(y)[x] <= 0 || zscan(y)[x]-z |
| 452 |
> |
> zeps*zscan(y)[x]) { |
| 453 |
|
zscan(y)[x] = z; |
| 454 |
|
copycolr(pscan(y)[x], pix); |
| 455 |
|
} |
| 456 |
+ |
} |
| 457 |
+ |
} |
| 458 |
|
} |
| 459 |
|
|
| 460 |
|
|
| 466 |
|
register int x, i; |
| 467 |
|
/* get back buffer */ |
| 468 |
|
yback = (int *)malloc(ourview.hresolu*sizeof(int)); |
| 469 |
< |
if (yback == NULL) { |
| 470 |
< |
perror(progname); |
| 432 |
< |
return; |
| 433 |
< |
} |
| 469 |
> |
if (yback == NULL) |
| 470 |
> |
syserror(); |
| 471 |
|
for (x = 0; x < ourview.hresolu; x++) |
| 472 |
|
yback[x] = -2; |
| 473 |
|
/* |
| 524 |
|
|| (xback >= 0 && ABS(x-xback) <= 1) |
| 525 |
|
|| ( ABS(y-yback[x]) > 1 |
| 526 |
|
&& zscan(yback[x])[x] |
| 527 |
< |
< zscan(y)[xback] ) ) |
| 527 |
> |
< zscan(y)[xback] ) ) { |
| 528 |
|
copycolr(pscan(y)[x],pscan(y)[xback]); |
| 529 |
< |
else |
| 529 |
> |
zscan(y)[x] = zscan(y)[xback]; |
| 530 |
> |
} else { |
| 531 |
|
copycolr(pscan(y)[x],pscan(yback[x])[x]); |
| 532 |
+ |
zscan(y)[x] = zscan(yback[x])[x]; |
| 533 |
+ |
} |
| 534 |
|
} else { /* full pixel */ |
| 535 |
|
yback[x] = -2; |
| 536 |
|
xback = -2; |
| 557 |
|
|
| 558 |
|
fputresolu(YMAJOR|YDECR, ourview.hresolu, ourview.vresolu, stdout); |
| 559 |
|
for (y = ourview.vresolu-1; y >= 0; y--) |
| 560 |
< |
if (fwritecolrs(pscan(y), ourview.hresolu, stdout) < 0) { |
| 561 |
< |
perror(progname); |
| 522 |
< |
exit(1); |
| 523 |
< |
} |
| 560 |
> |
if (fwritecolrs(pscan(y), ourview.hresolu, stdout) < 0) |
| 561 |
> |
syserror(); |
| 562 |
|
} |
| 563 |
|
|
| 564 |
|
|
| 576 |
|
exit(1); |
| 577 |
|
} |
| 578 |
|
if (donorm |
| 579 |
< |
&& (zout = (float *)malloc(ourview.hresolu*sizeof(float))) == NULL) { |
| 580 |
< |
perror(progname); |
| 543 |
< |
exit(1); |
| 544 |
< |
} |
| 579 |
> |
&& (zout = (float *)malloc(ourview.hresolu*sizeof(float))) == NULL) |
| 580 |
> |
syserror(); |
| 581 |
|
for (y = ourview.vresolu-1; y >= 0; y--) { |
| 582 |
|
if (donorm) { |
| 583 |
|
double vx, yzn2; |
| 620 |
|
register BYTE *dest = pscan(y)[x]; |
| 621 |
|
|
| 622 |
|
copycolr(dest, backcolr); |
| 623 |
+ |
zscan(y)[x] = backz; |
| 624 |
+ |
} |
| 625 |
+ |
|
| 626 |
+ |
|
| 627 |
+ |
calstart(prog, args) /* start fill calculation */ |
| 628 |
+ |
char *prog, *args; |
| 629 |
+ |
{ |
| 630 |
+ |
char combuf[512]; |
| 631 |
+ |
int p0[2], p1[2]; |
| 632 |
+ |
|
| 633 |
+ |
if (childpid != -1) { |
| 634 |
+ |
fprintf(stderr, "%s: too many calculations\n", progname); |
| 635 |
+ |
exit(1); |
| 636 |
+ |
} |
| 637 |
+ |
sprintf(combuf, prog, PACKSIZ, args); |
| 638 |
+ |
if (pipe(p0) < 0 || pipe(p1) < 0) |
| 639 |
+ |
syserror(); |
| 640 |
+ |
if ((childpid = vfork()) == 0) { /* fork calculation */ |
| 641 |
+ |
close(p0[1]); |
| 642 |
+ |
close(p1[0]); |
| 643 |
+ |
if (p0[0] != 0) { |
| 644 |
+ |
dup2(p0[0], 0); |
| 645 |
+ |
close(p0[0]); |
| 646 |
+ |
} |
| 647 |
+ |
if (p1[1] != 1) { |
| 648 |
+ |
dup2(p1[1], 1); |
| 649 |
+ |
close(p1[1]); |
| 650 |
+ |
} |
| 651 |
+ |
execl("/bin/sh", "sh", "-c", combuf, 0); |
| 652 |
+ |
perror("/bin/sh"); |
| 653 |
+ |
_exit(127); |
| 654 |
+ |
} |
| 655 |
+ |
if (childpid == -1) |
| 656 |
+ |
syserror(); |
| 657 |
+ |
close(p0[0]); |
| 658 |
+ |
close(p1[1]); |
| 659 |
+ |
if ((psend = fdopen(p0[1], "w")) == NULL) |
| 660 |
+ |
syserror(); |
| 661 |
+ |
if ((precv = fdopen(p1[0], "r")) == NULL) |
| 662 |
+ |
syserror(); |
| 663 |
+ |
queuesiz = 0; |
| 664 |
+ |
} |
| 665 |
+ |
|
| 666 |
+ |
|
| 667 |
+ |
caldone() /* done with calculation */ |
| 668 |
+ |
{ |
| 669 |
+ |
int pid; |
| 670 |
+ |
|
| 671 |
+ |
if (childpid == -1) |
| 672 |
+ |
return; |
| 673 |
+ |
if (fclose(psend) == EOF) |
| 674 |
+ |
syserror(); |
| 675 |
+ |
clearqueue(); |
| 676 |
+ |
fclose(precv); |
| 677 |
+ |
while ((pid = wait(0)) != -1 && pid != childpid) |
| 678 |
+ |
; |
| 679 |
+ |
childpid = -1; |
| 680 |
+ |
} |
| 681 |
+ |
|
| 682 |
+ |
|
| 683 |
+ |
rcalfill(x, y) /* fill with ray-calculated pixel */ |
| 684 |
+ |
int x, y; |
| 685 |
+ |
{ |
| 686 |
+ |
FVECT orig, dir; |
| 687 |
+ |
float outbuf[6]; |
| 688 |
+ |
|
| 689 |
+ |
if (queuesiz >= PACKSIZ) { /* flush queue */ |
| 690 |
+ |
if (fflush(psend) == EOF) |
| 691 |
+ |
syserror(); |
| 692 |
+ |
clearqueue(); |
| 693 |
+ |
} |
| 694 |
+ |
/* send new ray */ |
| 695 |
+ |
rayview(orig, dir, &ourview, x+.5, y+.5); |
| 696 |
+ |
outbuf[0] = orig[0]; outbuf[1] = orig[1]; outbuf[2] = orig[2]; |
| 697 |
+ |
outbuf[3] = dir[0]; outbuf[4] = dir[1]; outbuf[5] = dir[2]; |
| 698 |
+ |
if (fwrite(outbuf, sizeof(float), 6, psend) < 6) |
| 699 |
+ |
syserror(); |
| 700 |
+ |
/* remember it */ |
| 701 |
+ |
queue[queuesiz][0] = x; |
| 702 |
+ |
queue[queuesiz][1] = y; |
| 703 |
+ |
queuesiz++; |
| 704 |
+ |
} |
| 705 |
+ |
|
| 706 |
+ |
|
| 707 |
+ |
clearqueue() /* get results from queue */ |
| 708 |
+ |
{ |
| 709 |
+ |
float inbuf[4]; |
| 710 |
+ |
register int i; |
| 711 |
+ |
|
| 712 |
+ |
for (i = 0; i < queuesiz; i++) { |
| 713 |
+ |
if (fread(inbuf, sizeof(float), 4, precv) < 4) { |
| 714 |
+ |
fprintf(stderr, "%s: read error in clearqueue\n", |
| 715 |
+ |
progname); |
| 716 |
+ |
exit(1); |
| 717 |
+ |
} |
| 718 |
+ |
setcolr(pscan(queue[i][1])[queue[i][0]], |
| 719 |
+ |
inbuf[0], inbuf[1], inbuf[2]); |
| 720 |
+ |
zscan(queue[i][1])[queue[i][0]] = inbuf[3]; |
| 721 |
+ |
} |
| 722 |
+ |
queuesiz = 0; |
| 723 |
+ |
} |
| 724 |
+ |
|
| 725 |
+ |
|
| 726 |
+ |
syserror() /* report error and exit */ |
| 727 |
+ |
{ |
| 728 |
+ |
perror(progname); |
| 729 |
+ |
exit(1); |
| 730 |
|
} |