src/util/rpiece.c

/* Copyright (c) 1995 Regents of the University of California */

#ifndef lint
static char SCCSid[] = "$SunId$ LBL";
#endif

/*
 * Generate sections of a picture.
 */
 
#include "standard.h"

#ifndef F_SETLKW

main(argc, argv)
int argc;
char *argv[];
{
        fprintf(stderr, "%s: no NFS lock manager on this machine\n", argv[0]);
        exit(1);
}

#else

#include <signal.h>
#include "color.h"
#include "view.h"
#include "resolu.h"

#ifndef NFS
#define  NFS                    1
#endif
                                /* set the following to 0 to forgo forking */
#ifndef MAXFORK
#if NFS
#define  MAXFORK                3       /* allotment of duped processes */
#else
#define  MAXFORK                0
#endif
#endif
                                        /* protection from SYSV signals(!) */
#if defined(sgi)
#define guard_io()      sighold(SIGALRM)
#define unguard()       sigrelse(SIGALRM)
#endif
#ifndef guard_io
#define guard_io()      0
#define unguard()       0
#endif

#ifndef linux
extern char  *sys_errlist[];
#endif

                                /* rpict command */
char  *rpargv[128] = {"rpict", "-S", "1"};
int  rpargc = 3;
int  rpd[3];
FILE  *torp, *fromrp;
COLR  *pbuf;
                                /* our view parameters */
VIEW  ourview = STDVIEW;
double  pixaspect = 1.0;
int  hres = 1024, vres = 1024, hmult = 4, vmult = 4;
                                /* output file */
char  *outfile = NULL;
int  outfd;
long  scanorig;
FILE  *syncfp = NULL;           /* synchronization file pointer */
int  synclst = F_UNLCK;         /* synchronization file lock status */
int  nforked = 0;

#define  sflock(t)      if ((t)!=synclst) dolock(fileno(syncfp),synclst=t)

char  *progname;
int  verbose = 0;
unsigned  timelim = 0;
int  rvrlim = -1;

int  gotalrm = 0;
int  onalrm() { gotalrm++; }


main(argc, argv)
int  argc;
char  *argv[];
{
        register int  i, rval;
        
        progname = argv[0];
        for (i = 1; i < argc; i++) {
                                                /* expand arguments */
                while (rval = expandarg(&argc, &argv, i))
                        if (rval < 0) {
                                fprintf(stderr, "%s: cannot expand '%s'",
                                                argv[0], argv[i]);
                                exit(1);
                        }
                if (argv[i][0] == '-')
                        switch (argv[i][1]) {
                        case 'v':
                                switch (argv[i][2]) {
                                case '\0':      /* verbose option */
                                        verbose = !verbose;
                                        continue;
                                case 'f':       /* view file */
                                        if (viewfile(argv[++i], &ourview, NULL) <= 0) {
                                                fprintf(stderr,
                                        "%s: not a view file\n", argv[i]);
                                                exit(1);
                                        }
                                        continue;
                                default:        /* view option? */
                                        rval = getviewopt(&ourview, argc-i, argv+i);
                                        if (rval >= 0) {
                                                i += rval;
                                                continue;
                                        }
                                        break;
                                }
                                break;
                        case 'p':               /* pixel aspect ratio? */
                                if (argv[i][2] != 'a' || argv[i][3])
                                        break;
                                pixaspect = atof(argv[++i]);
                                continue;
                        case 'T':               /* time limit (hours) */
                                if (argv[i][2])
                                        break;
                                timelim = atof(argv[++i])*3600. + .5;
                                break;
                        case 'x':               /* overall x resolution */
                                if (argv[i][2])
                                        break;
                                hres = atoi(argv[++i]);
                                continue;
                        case 'y':               /* overall y resolution */
                                if (argv[i][2])
                                        break;
                                vres = atoi(argv[++i]);
                                continue;
                        case 'X':               /* horizontal multiplier */
                                if (argv[i][2])
                                        break;
                                hmult = atoi(argv[++i]);
                                continue;
                        case 'Y':               /* vertical multiplier */
                                if (argv[i][2])
                                        break;
                                vmult = atoi(argv[++i]);
                                continue;
                        case 'R':               /* recover */
                                if (argv[i][2])
                                        break;
                                rvrlim = 0;
                        /* fall through */
                        case 'F':               /* syncronization file */
                                if (argv[i][2])
                                        break;
                                if ((syncfp =
                fdopen(open(argv[++i],O_RDWR|O_CREAT,0666),"r+")) == NULL) {
                                        fprintf(stderr, "%s: cannot open\n",
                                                        argv[i]);
                                        exit(1);
                                }
                                continue;
                        case 'z':               /* z-file ist verbotten */
                                fprintf(stderr, "%s: -z option not allowed\n",
                                                argv[0]);
                                exit(1);
                        case 'o':               /* output file */
                                if (argv[i][2])
                                        break;
                                outfile = argv[++i];
                                continue;
                        } else if (i >= argc-1)
                                break;
                rpargv[rpargc++] = argv[i];
        }
        if (i >= argc) {
                fprintf(stderr, "%s: missing octree argument\n", argv[0]);
                exit(1);
        }
        if (outfile == NULL) {
                fprintf(stderr, "%s: missing output file\n", argv[0]);
                exit(1);
        }
        init(argc, argv);
        rpiece();
        exit(cleanup(0));
}


dolock(fd, ltyp)                /* lock or unlock a file */
int  fd;
int  ltyp;
{
        static struct flock  fls;       /* static so initialized to zeroes */

        fls.l_type = ltyp;
        if (fcntl(fd, F_SETLKW, &fls) < 0) {
                fprintf(stderr, "%s: cannot lock/unlock file: %s\n",
                                progname, sys_errlist[errno]);
                exit(1);
        }
}


init(ac, av)                    /* set up output file and start rpict */
int  ac;
char  **av;
{
        static char  hrbuf[16], vrbuf[16];
        extern char  VersionID[];
        char  *err;
        FILE  *fp;
        int  hr, vr;
                                        /* set up view */
        if ((err = setview(&ourview)) != NULL) {
                fprintf(stderr, "%s: %s\n", progname, err);
                exit(1);
        }
        if (syncfp != NULL) {
                sflock(F_RDLCK);
                fscanf(syncfp, "%d %d", &hmult, &vmult);
                sflock(F_UNLCK);
        }
                                        /* compute piece size */
        hres /= hmult;
        vres /= vmult;
        normaspect(viewaspect(&ourview)*hmult/vmult, &pixaspect, &hres, &vres);
        sprintf(hrbuf, "%d", hres);
        rpargv[rpargc++] = "-x"; rpargv[rpargc++] = hrbuf;
        sprintf(vrbuf, "%d", vres);
        rpargv[rpargc++] = "-y"; rpargv[rpargc++] = vrbuf;
        rpargv[rpargc++] = "-pa"; rpargv[rpargc++] = "0";
        rpargv[rpargc++] = av[ac-1];
        rpargv[rpargc] = NULL;
                                        /* open output file */
        if ((outfd = open(outfile, O_WRONLY|O_CREAT|O_EXCL, 0666)) >= 0) {
                dolock(outfd, F_WRLCK);
                if ((fp = fdopen(dup(outfd), "w")) == NULL)
                        goto filerr;
                newheader("RADIANCE", fp);      /* create header */
                printargs(ac, av, fp);
                fprintf(fp, "SOFTWARE= %s\n", VersionID);
                fputs(VIEWSTR, fp);
                fprintview(&ourview, fp);
                putc('\n', fp);
                if (pixaspect < .99 || pixaspect > 1.01)
                        fputaspect(pixaspect, fp);
                fputformat(COLRFMT, fp);
                putc('\n', fp);
                fprtresolu(hres*hmult, vres*vmult, fp);
        } else if ((outfd = open(outfile, O_RDWR)) >= 0) {
                dolock(outfd, F_RDLCK);
                if ((fp = fdopen(dup(outfd), "r+")) == NULL)
                        goto filerr;
                getheader(fp, NULL, NULL);      /* skip header */
                if (!fscnresolu(&hr, &vr, fp) ||        /* check resolution */
                                hr != hres*hmult || vr != vres*vmult) {
                        fprintf(stderr, "%s: resolution mismatch on file \"%s\"\n",
                                        progname, outfile);
                        exit(1);
                }
        } else {
                fprintf(stderr, "%s: cannot open file \"%s\"\n",
                                progname, outfile);
                exit(1);
        }
        scanorig = ftell(fp);           /* record position of first scanline */
        if (fclose(fp) == -1)           /* done with stream i/o */
                goto filerr;
        dolock(outfd, F_UNLCK);
                                        /* start rpict process */
        if (open_process(rpd, rpargv) <= 0) {
                fprintf(stderr, "%s: cannot start %s\n", progname, rpargv[0]);
                exit(1);
        }
        if ((fromrp = fdopen(rpd[0], "r")) == NULL ||
                        (torp = fdopen(rpd[1], "w")) == NULL) {
                fprintf(stderr, "%s: cannot open stream to %s\n",
                                progname, rpargv[0]);
                exit(1);
        }
        if ((pbuf = (COLR *)bmalloc(hres*vres*sizeof(COLR))) == NULL) {
                fprintf(stderr, "%s: out of memory\n", progname);
                exit(1);
        }
        signal(SIGALRM, onalrm);
        if (timelim)
                alarm(timelim);
        return;
filerr:
        fprintf(stderr, "%s: i/o error on file \"%s\"\n", progname, outfile);
        exit(1);
}


int
nextpiece(xp, yp)               /* get next piece assignment */
int  *xp, *yp;
{
        if (gotalrm)                    /* someone wants us to quit */
                return(0);
        if (syncfp != NULL) {           /* use sync file */
                /*
                 * So we don't necessarily have to lock and unlock the file
                 * multiple times (very slow), we establish an exclusive
                 * lock at the beginning on our synchronization file and
                 * maintain it in the subroutine rvrpiece().
                 */
                sflock(F_WRLCK);
                fseek(syncfp, 0L, 0);           /* read position */
                if (fscanf(syncfp, "%*d %*d %d %d", xp, yp) < 2) {
                        *xp = hmult-1;
                        *yp = vmult;
                }
                if (rvrlim == 0)                /* initialize recovery limit */
                        rvrlim = *xp*vmult + *yp;
                if (rvrpiece(xp, yp)) {         /* do stragglers first */
                        sflock(F_UNLCK);
                        return(1);
                }
                if (--(*yp) < 0) {              /* decrement position */
                        *yp = vmult-1;
                        if (--(*xp) < 0) {      /* all done */
                                sflock(F_UNLCK);
                                return(0);
                        }
                }
                fseek(syncfp, 0L, 0);           /* write new position */
                fprintf(syncfp, "%4d %4d\n%4d %4d\n\n", hmult, vmult, *xp, *yp);
                fflush(syncfp);
                sflock(F_UNLCK);                /* release sync file */
                return(1);
        }
        return(scanf("%d %d", xp, yp) == 2);    /* use stdin */
}


int
rvrpiece(xp, yp)                /* check for recoverable pieces */
register int  *xp, *yp;
{
        static char  *pdone = NULL;     /* which pieces are done */
        static long  readpos = -1;      /* how far we've read */
        register int  i;
        /*
         * This routine is called by nextpiece() with an
         * exclusive lock on syncfp and the file pointer at the
         * appropriate position to read in the finished pieces.
         */
        if (rvrlim < 0)
                return(0);              /* only check if asked */
        if (pdone == NULL)              /* first call */
                pdone = calloc(hmult*vmult, sizeof(char));
        if (pdone == NULL) {
                fprintf(stderr, "%s: out of memory\n", progname);
                exit(1);
        }
        if (readpos != -1)              /* mark what's been done */
                fseek(syncfp, readpos, 0);
        while (fscanf(syncfp, "%d %d", xp, yp) == 2)
                pdone[*xp*vmult+*yp] = 1;
        if (!feof(syncfp)) {
                fprintf(stderr, "%s: format error in sync file\n", progname);
                exit(1);
        }
        readpos = ftell(syncfp);
        i = hmult*vmult;                /* find an unaccounted for piece */
        while (i-- > rvrlim)
                if (!pdone[i]) {
                        *xp = i / vmult;
                        *yp = i % vmult;
                        pdone[i] = 1;   /* consider it done */
                        return(1);
                }
        rvrlim = -1;                    /* nothing left to recover */
        free(pdone);
        pdone = NULL;
        return(0);
}


int
cleanup(rstat)                  /* close rpict process and clean up */
int  rstat;
{
        int  status;

        bfree((char *)pbuf, hres*vres*sizeof(COLR));
        fclose(torp);
        fclose(fromrp);
        while (wait(&status) != -1)
                if (rstat == 0)
                        rstat = status>>8 & 0xff;
        return(rstat);
}


rpiece()                        /* render picture piece by piece */
{
        VIEW  pview;
        int  xorg, yorg;
                                        /* compute view parameters */
        copystruct(&pview, &ourview);
        switch (ourview.type) {
        case VT_PER:
                pview.horiz = 2.*180./PI*atan(
                                tan(PI/180./2.*ourview.horiz)/hmult );
                pview.vert = 2.*180./PI*atan(
                                tan(PI/180./2.*ourview.vert)/vmult );
                break;
        case VT_PAR:
        case VT_ANG:
                pview.horiz = ourview.horiz / hmult;
                pview.vert = ourview.vert / vmult;
                break;
        case VT_CYL:
                pview.horiz = ourview.horiz / hmult;
                pview.vert = 2.*180./PI*atan(
                                tan(PI/180./2.*ourview.vert)/vmult );
                break;
        case VT_HEM:
                pview.horiz = 2.*180./PI*asin(
                                sin(PI/180./2.*ourview.horiz)/hmult );
                pview.vert = 2.*180./PI*asin(
                                sin(PI/180./2.*ourview.vert)/vmult );
                break;
        default:
                fprintf(stderr, "%s: unknown view type '-vt%c'\n",
                                progname, ourview.type);
                exit(cleanup(1));
        }
                                        /* render each piece */
        while (nextpiece(&xorg, &yorg)) {
                pview.hoff = ourview.hoff*hmult + xorg - 0.5*(hmult-1);
                pview.voff = ourview.voff*vmult + yorg - 0.5*(vmult-1);
                fputs(VIEWSTR, torp);
                fprintview(&pview, torp);
                putc('\n', torp);
                fflush(torp);                   /* assigns piece to rpict */
                putpiece(xorg, yorg);           /* place piece in output */
        }
}


int
putpiece(xpos, ypos)            /* get next piece from rpict */
int  xpos, ypos;
{
        struct flock  fls;
        int  pid, status;
        int  hr, vr;
        register int  y;
                                /* check bounds */
        if (xpos < 0 | ypos < 0 | xpos >= hmult | ypos >= vmult) {
                fprintf(stderr, "%s: requested piece (%d,%d) out of range\n",
                                progname, xpos, ypos);
                exit(cleanup(1));
        }
                                /* check header from rpict */
        guard_io();
        getheader(fromrp, NULL, NULL);
        if (!fscnresolu(&hr, &vr, fromrp) || hr != hres | vr != vres) {
                fprintf(stderr, "%s: resolution mismatch from %s\n",
                                progname, rpargv[0]);
                exit(cleanup(1));
        }
        if (verbose) {                          /* notify caller */
                printf("%d %d begun\n", xpos, ypos);
                fflush(stdout);
        }
        unguard();
                                /* load new piece into buffer */
        for (y = 0; y < vr; y++) {
                guard_io();
                if (freadcolrs(pbuf+y*hr, hr, fromrp) < 0) {
                        fprintf(stderr, "%s: read error from %s\n",
                                        progname, rpargv[0]);
                        exit(cleanup(1));
                }
                unguard();
        }
#if MAXFORK
                                /* fork so we don't slow rpict down */
        if ((pid = fork()) > 0) {
                if (++nforked >= MAXFORK) {
                        wait(&status);          /* reap a child */
                        if (status)
                                exit(cleanup(status>>8 & 0xff));
                        nforked--;
                }
                return(pid);
        }
#else
        pid = -1;               /* no forking */
#endif
        fls.l_start = scanorig +
                ((long)(vmult-1-ypos)*vres*hmult+xpos)*hres*sizeof(COLR);
#if NFS
        fls.l_len = ((long)(vres-1)*hmult+1)*hres*sizeof(COLR);
                                /* lock file section so NFS doesn't mess up */
        fls.l_whence = 0;
        fls.l_type = F_WRLCK;
        if (fcntl(outfd, F_SETLKW, &fls) < 0)
                filerr("lock");
#endif
                                /* write new piece to file */
        if (lseek(outfd, fls.l_start, 0) < 0)
                filerr("seek");
        if (hmult == 1) {
                if (writebuf(outfd, (char *)pbuf,
                                vr*hr*sizeof(COLR)) != vr*hr*sizeof(COLR))
                        filerr("write");
        } else
                for (y = 0; y < vr; y++) {
                        if (writebuf(outfd, (char *)(pbuf+y*hr),
                                        hr*sizeof(COLR)) != hr*sizeof(COLR))
                                filerr("write");
                        if (y < vr-1 && lseek(outfd,
                                        (long)(hmult-1)*hr*sizeof(COLR),
                                        1) < 0)
                                filerr("seek");
                }
#if NFS
        fls.l_type = F_UNLCK;           /* release lock */
        if (fcntl(outfd, F_SETLKW, &fls) < 0)
                filerr("lock");
#endif
        if (verbose) {                          /* notify caller */
                printf("%d %d done\n", xpos, ypos);
                fflush(stdout);
        }
        if (syncfp != NULL) {                   /* record what's been done */
                sflock(F_WRLCK);
                fseek(syncfp, 0L, 2);           /* append index */
                fprintf(syncfp, "%4d %4d\n", xpos, ypos);
                fflush(syncfp);
                                /*** Unlock not necessary, since
                sflock(F_UNLCK);        _exit() or nextpiece() is next ***/
        }
        if (pid == -1)          /* didn't fork or fork failed */
                return(0);
        _exit(0);               /* else exit child process (releasing locks) */
}


filerr(t)                       /* report file error and exit */
char  *t;
{
        fprintf(stderr, "%s: %s error on file \"%s\": %s\n",
                        progname, t, outfile, sys_errlist[errno]);
        _exit(1);
}

#endif
Revision:	2.36
Committed:	Thu Jun 18 09:23:49 1998 UTC (27 years, 4 months ago) by gwlarson
Content type:	text/plain
Branch:	MAIN
Changes since 2.35:	+2 -4 lines
Log Message:	moved declarations of lseek() and ftell() to standard.h
#	User	Rev	Content
1	greg	2.31	/* Copyright (c) 1995 Regents of the University of California */
2	greg	2.1
3			#ifndef lint
4			static char SCCSid[] = "$SunId$ LBL";
5			#endif
6
7			/*
8			* Generate sections of a picture.
9			*/
10
11			#include "standard.h"
12	greg	2.16
13			#ifndef F_SETLKW
14
15			main(argc, argv)
16			int argc;
17			char *argv[];
18			{
19			fprintf(stderr, "%s: no NFS lock manager on this machine\n", argv[0]);
20			exit(1);
21			}
22
23			#else
24
25	greg	2.6	#include <signal.h>
26	greg	2.1	#include "color.h"
27			#include "view.h"
28			#include "resolu.h"
29
30	greg	2.12	#ifndef NFS
31			#define NFS 1
32			#endif
33	greg	2.9	/* set the following to 0 to forgo forking */
34			#ifndef MAXFORK
35	greg	2.12	#if NFS
36	greg	2.10	#define MAXFORK 3 /* allotment of duped processes */
37	greg	2.12	#else
38			#define MAXFORK 0
39	greg	2.9	#endif
40	greg	2.12	#endif
41	greg	2.18	/* protection from SYSV signals(!) */
42	greg	2.27	#if defined(sgi)
43	greg	2.18	#define guard_io() sighold(SIGALRM)
44			#define unguard() sigrelse(SIGALRM)
45			#endif
46			#ifndef guard_io
47			#define guard_io() 0
48			#define unguard() 0
49			#endif
50	gregl	2.34
51			#ifndef linux
52			extern char *sys_errlist[];
53			#endif
54
55	greg	2.1	/* rpict command */
56	greg	2.23	char *rpargv[128] = {"rpict", "-S", "1"};
57			int rpargc = 3;
58	greg	2.1	int rpd[3];
59			FILE torp, fromrp;
60	greg	2.8	COLR *pbuf;
61	greg	2.1	/* our view parameters */
62			VIEW ourview = STDVIEW;
63	greg	2.4	double pixaspect = 1.0;
64	greg	2.23	int hres = 1024, vres = 1024, hmult = 4, vmult = 4;
65	greg	2.1	/* output file */
66			char *outfile = NULL;
67			int outfd;
68			long scanorig;
69	greg	2.25	FILE syncfp = NULL; / synchronization file pointer */
70			int synclst = F_UNLCK; /* synchronization file lock status */
71	greg	2.9	int nforked = 0;
72	greg	2.1
73	greg	2.25	#define sflock(t) if ((t)!=synclst) dolock(fileno(syncfp),synclst=t)
74
75	greg	2.1	char *progname;
76			int verbose = 0;
77	greg	2.31	unsigned timelim = 0;
78	greg	2.25	int rvrlim = -1;
79	greg	2.1
80	greg	2.6	int gotalrm = 0;
81			int onalrm() { gotalrm++; }
82	greg	2.1
83	greg	2.6
84	greg	2.1	main(argc, argv)
85			int argc;
86			char *argv[];
87			{
88			register int i, rval;
89
90			progname = argv[0];
91			for (i = 1; i < argc; i++) {
92	greg	2.22	/* expand arguments */
93			while (rval = expandarg(&argc, &argv, i))
94			if (rval < 0) {
95			fprintf(stderr, "%s: cannot expand '%s'",
96			argv[0], argv[i]);
97			exit(1);
98			}
99	greg	2.1	if (argv[i][0] == '-')
100			switch (argv[i][1]) {
101			case 'v':
102			switch (argv[i][2]) {
103			case '\0': /* verbose option */
104			verbose = !verbose;
105			continue;
106			case 'f': /* view file */
107			if (viewfile(argv[++i], &ourview, NULL) <= 0) {
108			fprintf(stderr,
109			"%s: not a view file\n", argv[i]);
110			exit(1);
111			}
112			continue;
113			default: /* view option? */
114			rval = getviewopt(&ourview, argc-i, argv+i);
115			if (rval >= 0) {
116			i += rval;
117			continue;
118			}
119			break;
120			}
121			break;
122			case 'p': /* pixel aspect ratio? */
123	greg	2.23	if (argv[i][2] != 'a' \|\| argv[i][3])
124			break;
125	gregl	2.35	pixaspect = atof(argv[++i]);
126	greg	2.23	continue;
127	greg	2.31	case 'T': /* time limit (hours) */
128			if (argv[i][2])
129			break;
130			timelim = atof(argv[++i])*3600. + .5;
131			break;
132	greg	2.23	case 'x': /* overall x resolution */
133			if (argv[i][2])
134			break;
135			hres = atoi(argv[++i]);
136			continue;
137			case 'y': /* overall y resolution */
138			if (argv[i][2])
139			break;
140			vres = atoi(argv[++i]);
141			continue;
142	greg	2.1	case 'X': /* horizontal multiplier */
143			if (argv[i][2])
144			break;
145			hmult = atoi(argv[++i]);
146			continue;
147			case 'Y': /* vertical multiplier */
148			if (argv[i][2])
149			break;
150			vmult = atoi(argv[++i]);
151			continue;
152	greg	2.25	case 'R': /* recover */
153			if (argv[i][2])
154			break;
155			rvrlim = 0;
156			/* fall through */
157	greg	2.5	case 'F': /* syncronization file */
158			if (argv[i][2])
159			break;
160	greg	2.28	if ((syncfp =
161			fdopen(open(argv[++i],O_RDWR\|O_CREAT,0666),"r+")) == NULL) {
162	greg	2.5	fprintf(stderr, "%s: cannot open\n",
163			argv[i]);
164			exit(1);
165			}
166			continue;
167	greg	2.15	case 'z': /* z-file ist verbotten */
168			fprintf(stderr, "%s: -z option not allowed\n",
169			argv[0]);
170			exit(1);
171	greg	2.1	case 'o': /* output file */
172			if (argv[i][2])
173			break;
174			outfile = argv[++i];
175			continue;
176	greg	2.23	} else if (i >= argc-1)
177			break;
178	greg	2.1	rpargv[rpargc++] = argv[i];
179			}
180	greg	2.23	if (i >= argc) {
181			fprintf(stderr, "%s: missing octree argument\n", argv[0]);
182			exit(1);
183			}
184	greg	2.1	if (outfile == NULL) {
185			fprintf(stderr, "%s: missing output file\n", argv[0]);
186			exit(1);
187			}
188			init(argc, argv);
189			rpiece();
190	greg	2.15	exit(cleanup(0));
191	greg	2.1	}
192
193
194	greg	2.25	dolock(fd, ltyp) /* lock or unlock a file */
195			int fd;
196			int ltyp;
197			{
198			static struct flock fls; /* static so initialized to zeroes */
199
200			fls.l_type = ltyp;
201			if (fcntl(fd, F_SETLKW, &fls) < 0) {
202	greg	2.28	fprintf(stderr, "%s: cannot lock/unlock file: %s\n",
203			progname, sys_errlist[errno]);
204	greg	2.25	exit(1);
205			}
206			}
207
208
209	greg	2.1	init(ac, av) /* set up output file and start rpict */
210			int ac;
211			char **av;
212			{
213	greg	2.23	static char hrbuf[16], vrbuf[16];
214	greg	2.2	extern char VersionID[];
215	greg	2.1	char *err;
216			FILE *fp;
217			int hr, vr;
218			/* set up view */
219			if ((err = setview(&ourview)) != NULL) {
220			fprintf(stderr, "%s: %s\n", progname, err);
221			exit(1);
222			}
223	greg	2.25	if (syncfp != NULL) {
224			sflock(F_RDLCK);
225			fscanf(syncfp, "%d %d", &hmult, &vmult);
226			sflock(F_UNLCK);
227	greg	2.5	}
228	greg	2.23	/* compute piece size */
229			hres /= hmult;
230			vres /= vmult;
231	greg	2.1	normaspect(viewaspect(&ourview)*hmult/vmult, &pixaspect, &hres, &vres);
232	greg	2.23	sprintf(hrbuf, "%d", hres);
233			rpargv[rpargc++] = "-x"; rpargv[rpargc++] = hrbuf;
234			sprintf(vrbuf, "%d", vres);
235			rpargv[rpargc++] = "-y"; rpargv[rpargc++] = vrbuf;
236			rpargv[rpargc++] = "-pa"; rpargv[rpargc++] = "0";
237			rpargv[rpargc++] = av[ac-1];
238			rpargv[rpargc] = NULL;
239	greg	2.1	/* open output file */
240			if ((outfd = open(outfile, O_WRONLY\|O_CREAT\|O_EXCL, 0666)) >= 0) {
241	greg	2.25	dolock(outfd, F_WRLCK);
242	greg	2.1	if ((fp = fdopen(dup(outfd), "w")) == NULL)
243			goto filerr;
244	greg	2.29	newheader("RADIANCE", fp); /* create header */
245			printargs(ac, av, fp);
246	greg	2.2	fprintf(fp, "SOFTWARE= %s\n", VersionID);
247	greg	2.1	fputs(VIEWSTR, fp);
248			fprintview(&ourview, fp);
249			putc('\n', fp);
250			if (pixaspect < .99 \|\| pixaspect > 1.01)
251			fputaspect(pixaspect, fp);
252			fputformat(COLRFMT, fp);
253			putc('\n', fp);
254			fprtresolu(hreshmult, vresvmult, fp);
255			} else if ((outfd = open(outfile, O_RDWR)) >= 0) {
256	greg	2.25	dolock(outfd, F_RDLCK);
257	greg	2.1	if ((fp = fdopen(dup(outfd), "r+")) == NULL)
258			goto filerr;
259	greg	2.13	getheader(fp, NULL, NULL); /* skip header */
260	greg	2.15	if (!fscnresolu(&hr, &vr, fp) \|\| /* check resolution */
261	greg	2.1	hr != hreshmult \|\| vr != vresvmult) {
262	greg	2.8	fprintf(stderr, "%s: resolution mismatch on file \"%s\"\n",
263			progname, outfile);
264	greg	2.1	exit(1);
265			}
266			} else {
267	greg	2.8	fprintf(stderr, "%s: cannot open file \"%s\"\n",
268			progname, outfile);
269	greg	2.1	exit(1);
270			}
271			scanorig = ftell(fp); /* record position of first scanline */
272			if (fclose(fp) == -1) /* done with stream i/o */
273			goto filerr;
274	greg	2.25	dolock(outfd, F_UNLCK);
275	greg	2.1	/* start rpict process */
276			if (open_process(rpd, rpargv) <= 0) {
277	greg	2.3	fprintf(stderr, "%s: cannot start %s\n", progname, rpargv[0]);
278	greg	2.1	exit(1);
279			}
280			if ((fromrp = fdopen(rpd[0], "r")) == NULL \|\|
281			(torp = fdopen(rpd[1], "w")) == NULL) {
282			fprintf(stderr, "%s: cannot open stream to %s\n",
283			progname, rpargv[0]);
284			exit(1);
285			}
286	greg	2.23	if ((pbuf = (COLR )bmalloc(hresvres*sizeof(COLR))) == NULL) {
287	greg	2.1	fprintf(stderr, "%s: out of memory\n", progname);
288			exit(1);
289			}
290	greg	2.6	signal(SIGALRM, onalrm);
291	greg	2.31	if (timelim)
292			alarm(timelim);
293	greg	2.1	return;
294			filerr:
295	greg	2.8	fprintf(stderr, "%s: i/o error on file \"%s\"\n", progname, outfile);
296	greg	2.1	exit(1);
297			}
298
299
300			int
301	greg	2.5	nextpiece(xp, yp) /* get next piece assignment */
302			int xp, yp;
303			{
304	greg	2.6	if (gotalrm) /* someone wants us to quit */
305			return(0);
306	greg	2.25	if (syncfp != NULL) { /* use sync file */
307			/*
308			* So we don't necessarily have to lock and unlock the file
309			* multiple times (very slow), we establish an exclusive
310			* lock at the beginning on our synchronization file and
311			* maintain it in the subroutine rvrpiece().
312			*/
313			sflock(F_WRLCK);
314			fseek(syncfp, 0L, 0); /* read position */
315			if (fscanf(syncfp, "%d %d %d %d", xp, yp) < 2) {
316	greg	2.8	*xp = hmult-1;
317			*yp = vmult;
318			}
319	greg	2.25	if (rvrlim == 0) /* initialize recovery limit */
320			rvrlim = xpvmult + *yp;
321			if (rvrpiece(xp, yp)) { /* do stragglers first */
322			sflock(F_UNLCK);
323			return(1);
324			}
325	greg	2.8	if (--(yp) < 0) { / decrement position */
326	greg	2.5	*yp = vmult-1;
327	greg	2.25	if (--(xp) < 0) { / all done */
328			sflock(F_UNLCK);
329	greg	2.5	return(0);
330			}
331			}
332	greg	2.25	fseek(syncfp, 0L, 0); /* write new position */
333			fprintf(syncfp, "%4d %4d\n%4d %4d\n\n", hmult, vmult, xp, yp);
334			fflush(syncfp);
335			sflock(F_UNLCK); /* release sync file */
336	greg	2.5	return(1);
337			}
338	greg	2.26	return(scanf("%d %d", xp, yp) == 2); /* use stdin */
339	greg	2.5	}
340
341
342			int
343	greg	2.25	rvrpiece(xp, yp) /* check for recoverable pieces */
344			register int xp, yp;
345			{
346			static char pdone = NULL; / which pieces are done */
347			static long readpos = -1; /* how far we've read */
348			register int i;
349			/*
350			* This routine is called by nextpiece() with an
351			* exclusive lock on syncfp and the file pointer at the
352			* appropriate position to read in the finished pieces.
353			*/
354			if (rvrlim < 0)
355			return(0); /* only check if asked */
356			if (pdone == NULL) /* first call */
357			pdone = calloc(hmult*vmult, sizeof(char));
358	greg	2.30	if (pdone == NULL) {
359			fprintf(stderr, "%s: out of memory\n", progname);
360			exit(1);
361			}
362	greg	2.25	if (readpos != -1) /* mark what's been done */
363			fseek(syncfp, readpos, 0);
364			while (fscanf(syncfp, "%d %d", xp, yp) == 2)
365			pdone[xpvmult+*yp] = 1;
366			if (!feof(syncfp)) {
367			fprintf(stderr, "%s: format error in sync file\n", progname);
368			exit(1);
369			}
370			readpos = ftell(syncfp);
371			i = hmultvmult; / find an unaccounted for piece */
372			while (i-- > rvrlim)
373			if (!pdone[i]) {
374			*xp = i / vmult;
375			*yp = i % vmult;
376			pdone[i] = 1; /* consider it done */
377			return(1);
378			}
379			rvrlim = -1; /* nothing left to recover */
380			free(pdone);
381			pdone = NULL;
382			return(0);
383			}
384
385
386			int
387	greg	2.10	cleanup(rstat) /* close rpict process and clean up */
388			int rstat;
389	greg	2.1	{
390	greg	2.10	int status;
391	greg	2.1
392	greg	2.23	bfree((char )pbuf, hresvres*sizeof(COLR));
393	greg	2.1	fclose(torp);
394			fclose(fromrp);
395	greg	2.10	while (wait(&status) != -1)
396	greg	2.9	if (rstat == 0)
397			rstat = status>>8 & 0xff;
398			return(rstat);
399	greg	2.1	}
400
401
402			rpiece() /* render picture piece by piece */
403			{
404			VIEW pview;
405			int xorg, yorg;
406	greg	2.11	/* compute view parameters */
407			copystruct(&pview, &ourview);
408			switch (ourview.type) {
409			case VT_PER:
410			pview.horiz = 2.180./PIatan(
411			tan(PI/180./2.*ourview.horiz)/hmult );
412			pview.vert = 2.180./PIatan(
413			tan(PI/180./2.*ourview.vert)/vmult );
414			break;
415			case VT_PAR:
416			case VT_ANG:
417			pview.horiz = ourview.horiz / hmult;
418			pview.vert = ourview.vert / vmult;
419			break;
420	greg	2.32	case VT_CYL:
421			pview.horiz = ourview.horiz / hmult;
422			pview.vert = 2.180./PIatan(
423			tan(PI/180./2.*ourview.vert)/vmult );
424			break;
425	greg	2.11	case VT_HEM:
426			pview.horiz = 2.180./PIasin(
427			sin(PI/180./2.*ourview.horiz)/hmult );
428			pview.vert = 2.180./PIasin(
429			sin(PI/180./2.*ourview.vert)/vmult );
430			break;
431			default:
432			fprintf(stderr, "%s: unknown view type '-vt%c'\n",
433			progname, ourview.type);
434			exit(cleanup(1));
435			}
436			/* render each piece */
437	greg	2.5	while (nextpiece(&xorg, &yorg)) {
438	gregl	2.33	pview.hoff = ourview.hoffhmult + xorg - 0.5(hmult-1);
439			pview.voff = ourview.voffvmult + yorg - 0.5(vmult-1);
440	greg	2.1	fputs(VIEWSTR, torp);
441			fprintview(&pview, torp);
442			putc('\n', torp);
443	greg	2.11	fflush(torp); /* assigns piece to rpict */
444	greg	2.1	putpiece(xorg, yorg); /* place piece in output */
445			}
446			}
447
448
449	greg	2.9	int
450	greg	2.1	putpiece(xpos, ypos) /* get next piece from rpict */
451			int xpos, ypos;
452			{
453	greg	2.7	struct flock fls;
454	greg	2.9	int pid, status;
455	greg	2.1	int hr, vr;
456	greg	2.8	register int y;
457			/* check bounds */
458	greg	2.5	if (xpos < 0 \| ypos < 0 \| xpos >= hmult \| ypos >= vmult) {
459			fprintf(stderr, "%s: requested piece (%d,%d) out of range\n",
460			progname, xpos, ypos);
461	greg	2.10	exit(cleanup(1));
462	greg	2.5	}
463	greg	2.8	/* check header from rpict */
464	greg	2.18	guard_io();
465	greg	2.13	getheader(fromrp, NULL, NULL);
466	greg	2.15	if (!fscnresolu(&hr, &vr, fromrp) \|\| hr != hres \| vr != vres) {
467	greg	2.3	fprintf(stderr, "%s: resolution mismatch from %s\n",
468			progname, rpargv[0]);
469	greg	2.10	exit(cleanup(1));
470	greg	2.1	}
471	greg	2.24	if (verbose) { /* notify caller */
472			printf("%d %d begun\n", xpos, ypos);
473			fflush(stdout);
474			}
475	greg	2.18	unguard();
476	greg	2.8	/* load new piece into buffer */
477	greg	2.18	for (y = 0; y < vr; y++) {
478			guard_io();
479	greg	2.8	if (freadcolrs(pbuf+y*hr, hr, fromrp) < 0) {
480	greg	2.3	fprintf(stderr, "%s: read error from %s\n",
481			progname, rpargv[0]);
482	greg	2.10	exit(cleanup(1));
483	greg	2.1	}
484	greg	2.18	unguard();
485			}
486	greg	2.9	#if MAXFORK
487			/* fork so we don't slow rpict down */
488			if ((pid = fork()) > 0) {
489	greg	2.10	if (++nforked >= MAXFORK) {
490	greg	2.9	wait(&status); /* reap a child */
491			if (status)
492	greg	2.10	exit(cleanup(status>>8 & 0xff));
493	greg	2.9	nforked--;
494			}
495			return(pid);
496			}
497			#else
498			pid = -1; /* no forking */
499			#endif
500	greg	2.19	fls.l_start = scanorig +
501			((long)(vmult-1-ypos)vreshmult+xpos)hressizeof(COLR);
502	greg	2.12	#if NFS
503	greg	2.19	fls.l_len = ((long)(vres-1)hmult+1)hres*sizeof(COLR);
504	greg	2.8	/* lock file section so NFS doesn't mess up */
505			fls.l_whence = 0;
506			fls.l_type = F_WRLCK;
507	greg	2.26	if (fcntl(outfd, F_SETLKW, &fls) < 0)
508			filerr("lock");
509	greg	2.12	#endif
510	greg	2.8	/* write new piece to file */
511	gwlarson	2.36	if (lseek(outfd, fls.l_start, 0) < 0)
512	greg	2.26	filerr("seek");
513	greg	2.9	if (hmult == 1) {
514			if (writebuf(outfd, (char *)pbuf,
515			vrhrsizeof(COLR)) != vrhrsizeof(COLR))
516	greg	2.26	filerr("write");
517	greg	2.9	} else
518			for (y = 0; y < vr; y++) {
519			if (writebuf(outfd, (char )(pbuf+yhr),
520			hrsizeof(COLR)) != hrsizeof(COLR))
521	greg	2.26	filerr("write");
522	greg	2.9	if (y < vr-1 && lseek(outfd,
523			(long)(hmult-1)hrsizeof(COLR),
524	gwlarson	2.36	1) < 0)
525	greg	2.26	filerr("seek");
526	greg	2.1	}
527	greg	2.25	#if NFS
528			fls.l_type = F_UNLCK; /* release lock */
529	greg	2.26	if (fcntl(outfd, F_SETLKW, &fls) < 0)
530			filerr("lock");
531	greg	2.25	#endif
532	greg	2.32	if (verbose) { /* notify caller */
533			printf("%d %d done\n", xpos, ypos);
534			fflush(stdout);
535			}
536	greg	2.25	if (syncfp != NULL) { /* record what's been done */
537			sflock(F_WRLCK);
538			fseek(syncfp, 0L, 2); /* append index */
539			fprintf(syncfp, "%4d %4d\n", xpos, ypos);
540			fflush(syncfp);
541			/*** Unlock not necessary, since
542			sflock(F_UNLCK); _exit() or nextpiece() is next ***/
543	greg	2.20	}
544	greg	2.25	if (pid == -1) /* didn't fork or fork failed */
545	greg	2.9	return(0);
546	greg	2.25	_exit(0); /* else exit child process (releasing locks) */
547	greg	2.26	}
548
549
550			filerr(t) /* report file error and exit */
551			char *t;
552			{
553			fprintf(stderr, "%s: %s error on file \"%s\": %s\n",
554			progname, t, outfile, sys_errlist[errno]);
555	greg	2.9	_exit(1);
556	greg	2.1	}
557	greg	2.16
558			#endif