39 |
|
int gotview; /* got input view? */ |
40 |
|
|
41 |
|
int fill = F_FORE|F_BACK; /* selected fill algorithm */ |
42 |
< |
extern int backfill(), calfill(); /* fill functions */ |
42 |
> |
extern int backfill(), rcalfill(); /* fill functions */ |
43 |
|
int (*deffill)() = backfill; /* selected fill function */ |
44 |
|
COLR backcolr = BLKCOLR; /* background color */ |
45 |
|
double backz = 0.0; /* background z value */ |
47 |
|
double theirs2ours[4][4]; /* transformation matrix */ |
48 |
|
int normdist = 1; /* normalized distance? */ |
49 |
|
|
50 |
+ |
int childpid = -1; /* id of fill process */ |
51 |
|
FILE *psend, *precv; /* pipes to/from fill calculation */ |
51 |
– |
int childpid; /* child's process id */ |
52 |
|
int queue[PACKSIZ][2]; /* pending pixels */ |
53 |
|
int queuesiz; /* number of pixels pending */ |
54 |
|
|
108 |
|
break; |
109 |
|
case 'r': /* rtrace */ |
110 |
|
check(3,1); |
111 |
< |
deffill = calfill; |
111 |
> |
deffill = rcalfill; |
112 |
|
calstart(RTCOM, argv[++i]); |
113 |
|
break; |
114 |
|
default: |
205 |
|
else |
206 |
|
fillpicture(); |
207 |
|
/* close calculation */ |
208 |
< |
if (deffill == calfill) |
209 |
< |
caldone(); |
208 |
> |
caldone(); |
209 |
|
/* add to header */ |
210 |
|
printargs(argc, argv, stdout); |
211 |
|
if (gotvfile) { |
619 |
|
char combuf[512]; |
620 |
|
int p0[2], p1[2]; |
621 |
|
|
622 |
+ |
if (childpid != -1) { |
623 |
+ |
fprintf(stderr, "%s: too many calculations\n", progname); |
624 |
+ |
exit(1); |
625 |
+ |
} |
626 |
|
sprintf(combuf, prog, PACKSIZ, args); |
627 |
|
if (pipe(p0) < 0 || pipe(p1) < 0) |
628 |
< |
goto syserr; |
628 |
> |
syserror(); |
629 |
|
if ((childpid = vfork()) == 0) { /* fork calculation */ |
630 |
|
close(p0[1]); |
631 |
|
close(p1[0]); |
641 |
|
perror("/bin/sh"); |
642 |
|
_exit(127); |
643 |
|
} |
644 |
< |
if (childpid < 0) |
645 |
< |
goto syserr; |
644 |
> |
if (childpid == -1) |
645 |
> |
syserror(); |
646 |
|
close(p0[0]); |
647 |
|
close(p1[1]); |
648 |
|
if ((psend = fdopen(p0[1], "w")) == NULL) |
649 |
< |
goto syserr; |
649 |
> |
syserror(); |
650 |
|
if ((precv = fdopen(p1[0], "r")) == NULL) |
651 |
< |
goto syserr; |
651 |
> |
syserror(); |
652 |
|
queuesiz = 0; |
650 |
– |
return; |
651 |
– |
syserr: |
652 |
– |
perror(progname); |
653 |
– |
exit(1); |
653 |
|
} |
654 |
|
|
655 |
|
|
657 |
|
{ |
658 |
|
int pid; |
659 |
|
|
660 |
< |
fclose(psend); |
660 |
> |
if (childpid == -1) |
661 |
> |
return; |
662 |
> |
if (fclose(psend) == EOF) |
663 |
> |
syserror(); |
664 |
|
clearqueue(); |
665 |
|
fclose(precv); |
666 |
|
while ((pid = wait(0)) != -1 && pid != childpid) |
667 |
|
; |
668 |
+ |
childpid = -1; |
669 |
|
} |
670 |
|
|
671 |
|
|
672 |
< |
calfill(x, y) /* fill with calculated pixel */ |
672 |
> |
rcalfill(x, y) /* fill with ray-calculated pixel */ |
673 |
|
int x, y; |
674 |
|
{ |
675 |
|
FVECT orig, dir; |
676 |
|
float outbuf[6]; |
677 |
|
|
678 |
|
if (queuesiz >= PACKSIZ) { /* flush queue */ |
679 |
< |
fflush(psend); |
679 |
> |
if (fflush(psend) == EOF) |
680 |
> |
syserror(); |
681 |
|
clearqueue(); |
682 |
|
} |
683 |
|
/* send new ray */ |
684 |
|
rayview(orig, dir, &ourview, x+.5, y+.5); |
685 |
|
outbuf[0] = orig[0]; outbuf[1] = orig[1]; outbuf[2] = orig[2]; |
686 |
|
outbuf[3] = dir[0]; outbuf[4] = dir[1]; outbuf[5] = dir[2]; |
687 |
< |
fwrite(outbuf, sizeof(float), 6, psend); |
687 |
> |
if (fwrite(outbuf, sizeof(float), 6, psend) < 6) |
688 |
> |
syserror(); |
689 |
|
/* remember it */ |
690 |
|
queue[queuesiz][0] = x; |
691 |
|
queue[queuesiz][1] = y; |
699 |
|
register int i; |
700 |
|
|
701 |
|
for (i = 0; i < queuesiz; i++) { |
702 |
< |
fread(inbuf, sizeof(float), 4, precv); |
702 |
> |
if (fread(inbuf, sizeof(float), 4, precv) < 4) { |
703 |
> |
fprintf(stderr, "%s: read error in clearqueue\n", |
704 |
> |
progname); |
705 |
> |
exit(1); |
706 |
> |
} |
707 |
|
setcolr(pscan(queue[i][1])[queue[i][0]], |
708 |
|
inbuf[0], inbuf[1], inbuf[2]); |
709 |
|
zscan(queue[i][1])[queue[i][0]] = inbuf[3]; |
710 |
|
} |
711 |
|
queuesiz = 0; |
712 |
+ |
} |
713 |
+ |
|
714 |
+ |
|
715 |
+ |
syserror() /* report error and exit */ |
716 |
+ |
{ |
717 |
+ |
perror(progname); |
718 |
+ |
exit(1); |
719 |
|
} |