src/rt/rpict.c

/* Copyright (c) 1992 Regents of the University of California */

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

/*
 *  rpict.c - routines and variables for picture generation.
 *
 *     8/14/85
 */

#include  "ray.h"

#ifdef BSD
#include  <sys/time.h>
#include  <sys/resource.h>
#endif

#include  <signal.h>

#include  "view.h"

#include  "resolu.h"

#include  "random.h"

#include  "paths.h"

#define  RFTEMPLATE     "rfXXXXXX"

#ifndef SIGCONT
#define SIGCONT         SIGIO
#endif

int  dimlist[MAXDIM];                   /* sampling dimensions */
int  ndims = 0;                         /* number of sampling dimensions */
int  samplendx;                         /* sample index number */

VIEW  ourview = STDVIEW;                /* view parameters */
int  hresolu = 512;                     /* horizontal resolution */
int  vresolu = 512;                     /* vertical resolution */
double  pixaspect = 1.0;                /* pixel aspect ratio */

int  psample = 4;                       /* pixel sample size */
double  maxdiff = .05;                  /* max. difference for interpolation */
double  dstrpix = 0.67;                 /* square pixel distribution */

double  dstrsrc = 0.0;                  /* square source distribution */
double  shadthresh = .05;               /* shadow threshold */
double  shadcert = .5;                  /* shadow certainty */
int  directrelay = 1;                   /* number of source relays */
int  vspretest = 512;                   /* virtual source pretest density */
int  directvis = 1;                     /* sources visible? */
double  srcsizerat = .25;               /* maximum ratio source size/dist. */

double  specthresh = .15;               /* specular sampling threshold */
double  specjitter = 1.;                /* specular sampling jitter */

int  maxdepth = 6;                      /* maximum recursion depth */
double  minweight = 5e-3;               /* minimum ray weight */

COLOR  ambval = BLKCOLOR;               /* ambient value */
double  ambacc = 0.2;                   /* ambient accuracy */
int  ambres = 32;                       /* ambient resolution */
int  ambdiv = 128;                      /* ambient divisions */
int  ambssamp = 0;                      /* ambient super-samples */
int  ambounce = 0;                      /* ambient bounces */
char  *amblist[128];                    /* ambient include/exclude list */
int  ambincl = -1;                      /* include == 1, exclude == 0 */

#ifdef MSDOS
int  ralrm = 60;                        /* seconds between reports */
#else
int  ralrm = 0;                         /* seconds between reports */
#endif

double  pctdone = 0.0;                  /* percentage done */

long  tlastrept = 0L;                   /* time at last report */

extern long  time();
extern long  tstart;                    /* starting time */

extern unsigned long  nrays;            /* number of rays traced */

#define  MAXDIV         16              /* maximum sample size */

#define  pixjitter()    (.5+dstrpix*(.5-frandom()))

static int  hres, vres;                 /* resolution for this frame */

extern char  *mktemp();

double  pixvalue();

#ifdef NIX
#define  file_exists(f) (access(f,F_OK)==0)
#else
#include  <sys/types.h>
#include  <sys/stat.h>
int
file_exists(fname)                              /* ordinary file exists? */
char  *fname;
{
        struct stat  sbuf;
        if (stat(fname, &sbuf) < 0) return(0);
        return((sbuf.st_mode & S_IFREG) != 0);
}
#endif


quit(code)                      /* quit program */
int  code;
{
        if (code)                       /* report status */
                report();
        headclean();                    /* delete header file */
        pfclean();                      /* clean up persist files */
        exit(code);
}


#ifdef BSD
report()                /* report progress */
{
        struct rusage  rubuf;
        double  t;

        getrusage(RUSAGE_SELF, &rubuf);
        t = (rubuf.ru_utime.tv_usec + rubuf.ru_stime.tv_usec) / 1e6;
        t += rubuf.ru_utime.tv_sec + rubuf.ru_stime.tv_sec;
        getrusage(RUSAGE_CHILDREN, &rubuf);
        t += (rubuf.ru_utime.tv_usec + rubuf.ru_stime.tv_usec) / 1e6;
        t += rubuf.ru_utime.tv_sec + rubuf.ru_stime.tv_sec;

        sprintf(errmsg, "%lu rays, %4.2f%% done after %5.4f CPU hours\n",
                        nrays, pctdone, t/3600.0);
        eputs(errmsg);
        tlastrept = time((long *)0);
}
#else
report()                /* report progress */
{
        tlastrept = time((long *)0);
        sprintf(errmsg, "%lu rays, %4.2f%% done after %5.4f hours\n",
                        nrays, pctdone, (tlastrept-tstart)/3600.0);
        eputs(errmsg);
        signal(SIGCONT, report);
}
#endif


rpict(seq, pout, zout, prvr)                    /* generate image(s) */
int  seq;
char  *pout, *zout, *prvr;
/*
 * If seq is greater than zero, then we will render a sequence of
 * images based on view parameter strings read from the standard input.
 * If pout is NULL, then all images will be sent to the standard ouput.
 * If seq is greater than zero and prvr is an integer, then it is the
 * frame number at which rendering should begin.  Preceeding view parameter
 * strings will be skipped in the input.
 * If pout and prvr are the same, prvr is renamed to avoid overwriting.
 * Note that pout and zout should contain %d format specifications for
 * sequenced file naming.
 */
{
        extern char  *rindex(), *strncpy(), *strcat(), *strcpy();
        char  fbuf[128], fbuf2[128];
        int  npicts;
        register char  *cp;
        RESOLU  rs;
        double  pa;
                                        /* check sampling */
        if (psample < 1)
                psample = 1;
        else if (psample > MAXDIV) {
                sprintf(errmsg, "pixel sampling reduced from %d to %d",
                                psample, MAXDIV);
                error(WARNING, errmsg);
                psample = MAXDIV;
        }
                                        /* get starting frame */
        if (seq <= 0)
                seq = 0;
        else if (prvr != NULL && isint(prvr)) {
                register int  rn;               /* skip to specified view */
                if ((rn = atoi(prvr)) < seq)
                        error(USER, "recover frame less than start frame");
                if (pout == NULL)
                        error(USER, "missing output file specification");
                for ( ; seq < rn; seq++)
                        if (nextview(stdin) == EOF)
                                error(USER, "unexpected EOF on view input");
                prvr = fbuf;                    /* mark for renaming */
        }
        if (pout != NULL & prvr != NULL) {
                sprintf(fbuf, pout, seq);
                if (!strcmp(prvr, fbuf)) {      /* rename */
                        strcpy(fbuf2, fbuf);
                        for (cp = fbuf2; *cp; cp++)
                                ;
                        while (cp > fbuf2 && !ISDIRSEP(cp[-1]))
                                cp--;
                        strcpy(cp, RFTEMPLATE);
                        prvr = mktemp(fbuf2);
                        if (rename(fbuf, prvr) < 0)
                                if (errno == ENOENT) {  /* ghost file */
                                        sprintf(errmsg,
                                                "new output file \"%s\"",
                                                fbuf);
                                        error(WARNING, errmsg);
                                        prvr = NULL;
                                } else {                /* serious error */
                                        sprintf(errmsg,
                                        "cannot rename \"%s\" to \"%s\"",
                                                fbuf, prvr);
                                        error(SYSTEM, errmsg);
                                }
                }
        }
        npicts = 0;                     /* render sequence */
        do {
                if (seq && nextview(stdin) == EOF)
                        break;
                pctdone = 0.0;
                if (pout != NULL) {
                        sprintf(fbuf, pout, seq);
                        if (file_exists(fbuf)) {
                                if (prvr != NULL || !strcmp(fbuf, pout)) {
                                        sprintf(errmsg,
                                                "output file \"%s\" exists",
                                                fbuf);
                                        error(USER, errmsg);
                                }
                                continue;               /* don't clobber */
                        }
                        if (freopen(fbuf, "w", stdout) == NULL) {
                                sprintf(errmsg,
                                        "cannot open output file \"%s\"", fbuf);
                                error(SYSTEM, errmsg);
                        }
#ifdef MSDOS
                        setmode(fileno(stdout), O_BINARY);
#endif
                        dupheader();
                }
                hres = hresolu; vres = vresolu; pa = pixaspect;
                if (prvr != NULL)
                        if (viewfile(prvr, &ourview, &rs) <= 0
                                        || rs.or != PIXSTANDARD) {
                                sprintf(errmsg,
                        "cannot recover view parameters from \"%s\"", prvr);
                                error(WARNING, errmsg);
                        } else {
                                pa = 0.0;
                                hres = scanlen(&rs);
                                vres = numscans(&rs);
                        }
                if ((cp = setview(&ourview)) != NULL)
                        error(USER, cp);
                normaspect(viewaspect(&ourview), &pa, &hres, &vres);
                if (seq) {
                        if (ralrm > 0) {
                                fprintf(stderr, "FRAME %d:", seq);
                                fprintview(&ourview, stderr);
                                putc('\n', stderr);
                                fflush(stderr);
                        }
                        printf("FRAME=%d\n", seq);
                }
                fputs(VIEWSTR, stdout);
                fprintview(&ourview, stdout);
                putchar('\n');
                if (pa < .99 || pa > 1.01)
                        fputaspect(pa, stdout);
                fputformat(COLRFMT, stdout);
                putchar('\n');
                if (zout != NULL)
                        sprintf(cp=fbuf, zout, seq);
                else
                        cp = NULL;
                render(cp, prvr);
                prvr = NULL;
                npicts++;
        } while (seq++);
                                        /* check that we did something */
        if (npicts == 0)
                error(WARNING, "no output produced");
}


nextview(fp)                            /* get next view from fp */
FILE  *fp;
{
        char  linebuf[256];

        while (fgets(linebuf, sizeof(linebuf), fp) != NULL)
                if (isview(linebuf) && sscanview(&ourview, linebuf) > 0)
                        return(0);
        return(EOF);
}       


render(zfile, oldfile)                          /* render the scene */
char  *zfile, *oldfile;
{
        extern long  lseek();
        COLOR  *scanbar[MAXDIV+1];      /* scanline arrays of pixel values */
        float  *zbar[MAXDIV+1];         /* z values */
        char  *sampdens;                /* previous sample density */
        int  ypos;                      /* current scanline */
        int  ystep;                     /* current y step size */
        int  hstep;                     /* h step size */
        int  zfd;
        COLOR  *colptr;
        float  *zptr;
        register int  i;
                                        /* allocate scanlines */
        for (i = 0; i <= psample; i++) {
                scanbar[i] = (COLOR *)malloc(hres*sizeof(COLOR));
                if (scanbar[i] == NULL)
                        goto memerr;
        }
        hstep = (psample*140+49)/99;            /* quincunx sampling */
        ystep = (psample*99+70)/140;
        if (hstep > 2) {
                i = hres/hstep + 2;
                if ((sampdens = malloc(i)) == NULL)
                        goto memerr;
                while (i--)
                        sampdens[i] = hstep;
        } else
                sampdens = NULL;
                                        /* open z-file */
        if (zfile != NULL) {
                if ((zfd = open(zfile, O_WRONLY|O_CREAT, 0666)) == -1) {
                        sprintf(errmsg, "cannot open z-file \"%s\"", zfile);
                        error(SYSTEM, errmsg);
                }
#ifdef MSDOS
                setmode(zfd, O_BINARY);
#endif
                for (i = 0; i <= psample; i++) {
                        zbar[i] = (float *)malloc(hres*sizeof(float));
                        if (zbar[i] == NULL)
                                goto memerr;
                }
        } else {
                zfd = -1;
                for (i = 0; i <= psample; i++)
                        zbar[i] = NULL;
        }
                                        /* write out boundaries */
        fprtresolu(hres, vres, stdout);
                                        /* recover file and compute first */
        i = salvage(oldfile);
        if (zfd != -1 && i > 0 &&
                        lseek(zfd, (long)i*hres*sizeof(float), 0) == -1)
                error(SYSTEM, "z-file seek error in render");
        pctdone = 100.0*i/vres;
        if (ralrm > 0)                  /* report init stats */
                report();
#ifndef  BSD
        else
#endif
        signal(SIGCONT, report);
        ypos = vres-1 - i;
        fillscanline(scanbar[0], zbar[0], sampdens, hres, ypos, hstep);
                                                /* compute scanlines */
        for (ypos -= ystep; ypos > -ystep; ypos -= ystep) {
                                                        /* bottom adjust? */
                if (ypos < 0) {
                        ystep += ypos;
                        ypos = 0;
                }
                colptr = scanbar[ystep];                /* move base to top */
                scanbar[ystep] = scanbar[0];
                scanbar[0] = colptr;
                zptr = zbar[ystep];
                zbar[ystep] = zbar[0];
                zbar[0] = zptr;
                                                        /* fill base line */
                fillscanline(scanbar[0], zbar[0], sampdens,
                                hres, ypos, hstep);
                                                        /* fill bar */
                fillscanbar(scanbar, zbar, hres, ypos, ystep);
                                                        /* write it out */
#ifndef  BSD
                signal(SIGCONT, SIG_IGN);       /* don't interrupt writes */
#endif
                for (i = ystep; i > 0; i--) {
                        if (zfd != -1 && write(zfd, (char *)zbar[i],
                                        hres*sizeof(float))
                                        < hres*sizeof(float))
                                goto writerr;
                        if (fwritescan(scanbar[i], hres, stdout) < 0)
                                goto writerr;
                }
                if (fflush(stdout) == EOF)
                        goto writerr;
                                                        /* record progress */
                pctdone = 100.0*(vres-1-ypos)/vres;
                if (ralrm > 0 && time((long *)0) >= tlastrept+ralrm)
                        report();
#ifndef  BSD
                else
                        signal(SIGCONT, report);
#endif
        }
                                                /* clean up */
        signal(SIGCONT, SIG_IGN);
        if (zfd != -1) {
                if (write(zfd, (char *)zbar[0], hres*sizeof(float))
                                < hres*sizeof(float))
                        goto writerr;
                if (close(zfd) == -1)
                        goto writerr;
                for (i = 0; i <= psample; i++)
                        free((char *)zbar[i]);
        }
        fwritescan(scanbar[0], hres, stdout);
        if (fflush(stdout) == EOF)
                goto writerr;
        for (i = 0; i <= psample; i++)
                free((char *)scanbar[i]);
        if (sampdens != NULL)
                free(sampdens);
        pctdone = 100.0;
        if (ralrm > 0)
                report();
        signal(SIGCONT, SIG_DFL);
        return;
writerr:
        error(SYSTEM, "write error in render");
memerr:
        error(SYSTEM, "out of memory in render");
}


fillscanline(scanline, zline, sd, xres, y, xstep)       /* fill scan at y */
register COLOR  *scanline;
register float  *zline;
register char  *sd;
int  xres, y, xstep;
{
        static int  nc = 0;             /* number of calls */
        int  bl = xstep, b = xstep;
        double  z;
        register int  i;
        
        z = pixvalue(scanline[0], 0, y);
        if (zline) zline[0] = z;
                                /* zig-zag start for quincunx pattern */
        for (i = ++nc & 1 ? xstep : xstep/2; i < xres-1+xstep; i += xstep) {
                if (i >= xres) {
                        xstep += xres-1-i;
                        i = xres-1;
                }
                z = pixvalue(scanline[i], i, y);
                if (zline) zline[i] = z;
                if (sd) b = sd[0] > sd[1] ? sd[0] : sd[1];
                if (i <= xstep)
                        b = fillsample(scanline, zline, 0, y, i, 0, b/2);
                else
                        b = fillsample(scanline+i-xstep,
                                        zline ? zline+i-xstep : NULL,
                                        i-xstep, y, xstep, 0, b/2);
                if (sd) *sd++ = nc & 1 ? bl : b;
                bl = b;
        }
        if (sd && nc & 1) *sd = bl;
}


fillscanbar(scanbar, zbar, xres, y, ysize)      /* fill interior */
register COLOR  *scanbar[];
register float  *zbar[];
int  xres, y, ysize;
{
        COLOR  vline[MAXDIV+1];
        float  zline[MAXDIV+1];
        int  b = ysize;
        register int  i, j;
        
        for (i = 0; i < xres; i++) {
                
                copycolor(vline[0], scanbar[0][i]);
                copycolor(vline[ysize], scanbar[ysize][i]);
                if (zbar[0]) {
                        zline[0] = zbar[0][i];
                        zline[ysize] = zbar[ysize][i];
                }
                
                b = fillsample(vline, zbar[0] ? zline : NULL,
                                i, y, 0, ysize, b/2);
                
                for (j = 1; j < ysize; j++)
                        copycolor(scanbar[j][i], vline[j]);
                if (zbar[0])
                        for (j = 1; j < ysize; j++)
                                zbar[j][i] = zline[j];
        }
}


int
fillsample(colline, zline, x, y, xlen, ylen, b) /* fill interior points */
register COLOR  *colline;
register float  *zline;
int  x, y;
int  xlen, ylen;
int  b;
{
        double  ratio;
        double  z;
        COLOR  ctmp;
        int  ncut;
        register int  len;
        
        if (xlen > 0)                   /* x or y length is zero */
                len = xlen;
        else
                len = ylen;
                
        if (len <= 1)                   /* limit recursion */
                return(0);
        
        if (b > 0
        || (zline && 2.*fabs(zline[0]-zline[len]) > maxdiff*(zline[0]+zline[len]))
                        || bigdiff(colline[0], colline[len], maxdiff)) {
        
                z = pixvalue(colline[len>>1], x + (xlen>>1), y + (ylen>>1));
                if (zline) zline[len>>1] = z;
                ncut = 1;
                
        } else {                                        /* interpolate */
        
                copycolor(colline[len>>1], colline[len]);
                ratio = (double)(len>>1) / len;
                scalecolor(colline[len>>1], ratio);
                if (zline) zline[len>>1] = zline[len] * ratio;
                ratio = 1.0 - ratio;
                copycolor(ctmp, colline[0]);
                scalecolor(ctmp, ratio);
                addcolor(colline[len>>1], ctmp);
                if (zline) zline[len>>1] += zline[0] * ratio;
                ncut = 0;
        }
                                                        /* recurse */
        ncut += fillsample(colline, zline, x, y, xlen>>1, ylen>>1, (b-1)/2);
        
        ncut += fillsample(colline+(len>>1), zline ? zline+(len>>1) : NULL,
                        x+(xlen>>1), y+(ylen>>1),
                        xlen-(xlen>>1), ylen-(ylen>>1), b/2);

        return(ncut);
}


double
pixvalue(col, x, y)             /* compute pixel value */
COLOR  col;                     /* returned color */
int  x, y;                      /* pixel position */
{
        static RAY  thisray;

        if (viewray(thisray.rorg, thisray.rdir, &ourview,
                        (x+pixjitter())/hres, (y+pixjitter())/vres) < 0) {
                setcolor(col, 0.0, 0.0, 0.0);
                return(0.0);
        }

        rayorigin(&thisray, NULL, PRIMARY, 1.0);

        samplendx = pixnumber(x,y,hres,vres);   /* set pixel index */

        rayvalue(&thisray);                     /* trace ray */

        copycolor(col, thisray.rcol);           /* return color */
        
        return(thisray.rt);                     /* return distance */
}


int
salvage(oldfile)                /* salvage scanlines from killed program */
char  *oldfile;
{
        COLR  *scanline;
        FILE  *fp;
        int  x, y;

        if (oldfile == NULL)
                return(0);
        
        if ((fp = fopen(oldfile, "r")) == NULL) {
                sprintf(errmsg, "cannot open recover file \"%s\"", oldfile);
                error(WARNING, errmsg);
                return(0);
        }
#ifdef MSDOS
        setmode(fileno(fp), O_BINARY);
#endif
                                /* discard header */
        getheader(fp, NULL, NULL);
                                /* get picture size */
        if (!fscnresolu(&x, &y, fp)) {
                sprintf(errmsg, "bad recover file \"%s\" - not removed",
                                oldfile);
                error(WARNING, errmsg);
                fclose(fp);
                return(0);
        }

        if (x != hres || y != vres) {
                sprintf(errmsg, "resolution mismatch in recover file \"%s\"",
                                oldfile);
                error(USER, errmsg);
        }

        scanline = (COLR *)malloc(hres*sizeof(COLR));
        if (scanline == NULL)
                error(SYSTEM, "out of memory in salvage");
        for (y = 0; y < vres; y++) {
                if (freadcolrs(scanline, hres, fp) < 0)
                        break;
                if (fwritecolrs(scanline, hres, stdout) < 0)
                        goto writerr;
        }
        if (fflush(stdout) == EOF)
                goto writerr;
        free((char *)scanline);
        fclose(fp);
        unlink(oldfile);
        return(y);
writerr:
        sprintf(errmsg, "write error during recovery of \"%s\"", oldfile);
        error(SYSTEM, errmsg);
}


int
pixnumber(x, y, xres, yres)             /* compute pixel index (brushed) */
register int  x, y;
int  xres, yres;
{
        x -= y;
        while (x < 0)
                x += xres;
        return((((x>>2)*yres + y) << 2) + (x & 3));
}
Revision:	2.29
Committed:	Wed Aug 11 09:46:15 1993 UTC (30 years, 8 months ago) by greg
Content type:	text/plain
Branch:	MAIN
Changes since 2.28:	+2 -1 lines
Log Message:	improved error reporting on bad recover files
#	User	Rev	Content
1	greg	2.8	/* Copyright (c) 1992 Regents of the University of California */
2	greg	1.1
3			#ifndef lint
4			static char SCCSid[] = "$SunId$ LBL";
5			#endif
6
7			/*
8			* rpict.c - routines and variables for picture generation.
9			*
10			* 8/14/85
11			*/
12
13			#include "ray.h"
14
15			#ifdef BSD
16			#include <sys/time.h>
17			#include <sys/resource.h>
18	greg	1.34	#endif
19
20	greg	1.14	#include <signal.h>
21	greg	1.1
22			#include "view.h"
23
24	greg	1.36	#include "resolu.h"
25
26	greg	1.1	#include "random.h"
27
28	greg	2.12	#include "paths.h"
29
30	greg	2.21	#define RFTEMPLATE "rfXXXXXX"
31
32	greg	2.22	#ifndef SIGCONT
33			#define SIGCONT SIGIO
34			#endif
35
36	greg	1.25	int dimlist[MAXDIM]; /* sampling dimensions */
37			int ndims = 0; /* number of sampling dimensions */
38			int samplendx; /* sample index number */
39
40	greg	1.12	VIEW ourview = STDVIEW; /* view parameters */
41			int hresolu = 512; /* horizontal resolution */
42			int vresolu = 512; /* vertical resolution */
43	greg	2.14	double pixaspect = 1.0; /* pixel aspect ratio */
44	greg	1.1
45			int psample = 4; /* pixel sample size */
46	greg	2.14	double maxdiff = .05; /* max. difference for interpolation */
47			double dstrpix = 0.67; /* square pixel distribution */
48	greg	1.1
49	greg	2.14	double dstrsrc = 0.0; /* square source distribution */
50			double shadthresh = .05; /* shadow threshold */
51			double shadcert = .5; /* shadow certainty */
52	greg	1.35	int directrelay = 1; /* number of source relays */
53	greg	1.29	int vspretest = 512; /* virtual source pretest density */
54	greg	2.20	int directvis = 1; /* sources visible? */
55	greg	2.14	double srcsizerat = .25; /* maximum ratio source size/dist. */
56	greg	1.1
57	greg	2.14	double specthresh = .15; /* specular sampling threshold */
58			double specjitter = 1.; /* specular sampling jitter */
59	greg	2.5
60	greg	1.1	int maxdepth = 6; /* maximum recursion depth */
61	greg	2.14	double minweight = 5e-3; /* minimum ray weight */
62	greg	1.1
63			COLOR ambval = BLKCOLOR; /* ambient value */
64	greg	2.14	double ambacc = 0.2; /* ambient accuracy */
65	greg	1.6	int ambres = 32; /* ambient resolution */
66	greg	1.1	int ambdiv = 128; /* ambient divisions */
67			int ambssamp = 0; /* ambient super-samples */
68			int ambounce = 0; /* ambient bounces */
69			char amblist[128]; / ambient include/exclude list */
70			int ambincl = -1; /* include == 1, exclude == 0 */
71
72	greg	2.16	#ifdef MSDOS
73			int ralrm = 60; /* seconds between reports */
74			#else
75	greg	1.1	int ralrm = 0; /* seconds between reports */
76	greg	2.16	#endif
77	greg	1.1
78	greg	2.14	double pctdone = 0.0; /* percentage done */
79	greg	1.1
80	greg	1.24	long tlastrept = 0L; /* time at last report */
81
82			extern long time();
83			extern long tstart; /* starting time */
84
85	greg	2.24	extern unsigned long nrays; /* number of rays traced */
86	greg	1.1
87	greg	2.14	#define MAXDIV 16 /* maximum sample size */
88	greg	1.1
89	greg	2.14	#define pixjitter() (.5+dstrpix*(.5-frandom()))
90	greg	1.1
91	greg	2.8	static int hres, vres; /* resolution for this frame */
92
93			extern char *mktemp();
94
95	greg	2.14	double pixvalue();
96	greg	1.1
97	greg	2.27	#ifdef NIX
98			#define file_exists(f) (access(f,F_OK)==0)
99			#else
100			#include <sys/types.h>
101			#include <sys/stat.h>
102			int
103			file_exists(fname) /* ordinary file exists? */
104			char *fname;
105			{
106			struct stat sbuf;
107			if (stat(fname, &sbuf) < 0) return(0);
108			return((sbuf.st_mode & S_IFREG) != 0);
109			}
110			#endif
111	greg	1.11
112	greg	2.27
113	greg	1.1	quit(code) /* quit program */
114			int code;
115			{
116	greg	2.8	if (code) /* report status */
117	greg	1.1	report();
118	greg	2.21	headclean(); /* delete header file */
119			pfclean(); /* clean up persist files */
120	greg	1.1	exit(code);
121			}
122
123
124	greg	1.24	#ifdef BSD
125	greg	1.1	report() /* report progress */
126			{
127			struct rusage rubuf;
128	greg	2.14	double t;
129	greg	1.1
130			getrusage(RUSAGE_SELF, &rubuf);
131			t = (rubuf.ru_utime.tv_usec + rubuf.ru_stime.tv_usec) / 1e6;
132			t += rubuf.ru_utime.tv_sec + rubuf.ru_stime.tv_sec;
133			getrusage(RUSAGE_CHILDREN, &rubuf);
134			t += (rubuf.ru_utime.tv_usec + rubuf.ru_stime.tv_usec) / 1e6;
135			t += rubuf.ru_utime.tv_sec + rubuf.ru_stime.tv_sec;
136
137	greg	2.24	sprintf(errmsg, "%lu rays, %4.2f%% done after %5.4f CPU hours\n",
138	greg	1.1	nrays, pctdone, t/3600.0);
139	greg	1.24	eputs(errmsg);
140			tlastrept = time((long *)0);
141			}
142	greg	1.1	#else
143	greg	1.24	report() /* report progress */
144			{
145			tlastrept = time((long *)0);
146	greg	2.24	sprintf(errmsg, "%lu rays, %4.2f%% done after %5.4f hours\n",
147	greg	1.24	nrays, pctdone, (tlastrept-tstart)/3600.0);
148	greg	1.1	eputs(errmsg);
149	greg	2.22	signal(SIGCONT, report);
150	greg	1.1	}
151	greg	1.24	#endif
152	greg	1.1
153
154	greg	2.8	rpict(seq, pout, zout, prvr) /* generate image(s) */
155			int seq;
156			char pout, zout, *prvr;
157			/*
158			* If seq is greater than zero, then we will render a sequence of
159			* images based on view parameter strings read from the standard input.
160			* If pout is NULL, then all images will be sent to the standard ouput.
161			* If seq is greater than zero and prvr is an integer, then it is the
162			* frame number at which rendering should begin. Preceeding view parameter
163			* strings will be skipped in the input.
164			* If pout and prvr are the same, prvr is renamed to avoid overwriting.
165			* Note that pout and zout should contain %d format specifications for
166			* sequenced file naming.
167			*/
168			{
169	greg	2.21	extern char rindex(), strncpy(), strcat(), strcpy();
170	greg	2.9	char fbuf[128], fbuf2[128];
171	greg	2.26	int npicts;
172	greg	2.9	register char *cp;
173	greg	2.14	RESOLU rs;
174			double pa;
175	greg	2.8	/* check sampling */
176			if (psample < 1)
177			psample = 1;
178			else if (psample > MAXDIV) {
179			sprintf(errmsg, "pixel sampling reduced from %d to %d",
180			psample, MAXDIV);
181			error(WARNING, errmsg);
182			psample = MAXDIV;
183			}
184			/* get starting frame */
185			if (seq <= 0)
186			seq = 0;
187			else if (prvr != NULL && isint(prvr)) {
188	greg	2.9	register int rn; /* skip to specified view */
189	greg	2.8	if ((rn = atoi(prvr)) < seq)
190			error(USER, "recover frame less than start frame");
191			if (pout == NULL)
192			error(USER, "missing output file specification");
193			for ( ; seq < rn; seq++)
194			if (nextview(stdin) == EOF)
195			error(USER, "unexpected EOF on view input");
196			prvr = fbuf; /* mark for renaming */
197			}
198	greg	2.18	if (pout != NULL & prvr != NULL) {
199	greg	2.8	sprintf(fbuf, pout, seq);
200	greg	2.18	if (!strcmp(prvr, fbuf)) { /* rename */
201			strcpy(fbuf2, fbuf);
202			for (cp = fbuf2; *cp; cp++)
203			;
204			while (cp > fbuf2 && !ISDIRSEP(cp[-1]))
205			cp--;
206			strcpy(cp, RFTEMPLATE);
207	greg	2.8	prvr = mktemp(fbuf2);
208	greg	2.28	if (rename(fbuf, prvr) < 0)
209			if (errno == ENOENT) { /* ghost file */
210			sprintf(errmsg,
211			"new output file \"%s\"",
212			fbuf);
213			error(WARNING, errmsg);
214			prvr = NULL;
215			} else { /* serious error */
216			sprintf(errmsg,
217	greg	2.8	"cannot rename \"%s\" to \"%s\"",
218			fbuf, prvr);
219	greg	2.28	error(SYSTEM, errmsg);
220			}
221	greg	2.8	}
222			}
223	greg	2.26	npicts = 0; /* render sequence */
224	greg	2.8	do {
225			if (seq && nextview(stdin) == EOF)
226			break;
227	greg	2.25	pctdone = 0.0;
228	greg	2.8	if (pout != NULL) {
229			sprintf(fbuf, pout, seq);
230	greg	2.27	if (file_exists(fbuf)) {
231			if (prvr != NULL \|\| !strcmp(fbuf, pout)) {
232			sprintf(errmsg,
233			"output file \"%s\" exists",
234			fbuf);
235			error(USER, errmsg);
236			}
237	greg	2.26	continue; /* don't clobber */
238	greg	2.27	}
239	greg	2.8	if (freopen(fbuf, "w", stdout) == NULL) {
240			sprintf(errmsg,
241			"cannot open output file \"%s\"", fbuf);
242			error(SYSTEM, errmsg);
243			}
244	greg	2.17	#ifdef MSDOS
245			setmode(fileno(stdout), O_BINARY);
246			#endif
247	greg	2.8	dupheader();
248			}
249			hres = hresolu; vres = vresolu; pa = pixaspect;
250			if (prvr != NULL)
251			if (viewfile(prvr, &ourview, &rs) <= 0
252			\|\| rs.or != PIXSTANDARD) {
253			sprintf(errmsg,
254			"cannot recover view parameters from \"%s\"", prvr);
255			error(WARNING, errmsg);
256			} else {
257			pa = 0.0;
258			hres = scanlen(&rs);
259			vres = numscans(&rs);
260			}
261	greg	2.9	if ((cp = setview(&ourview)) != NULL)
262			error(USER, cp);
263	greg	2.8	normaspect(viewaspect(&ourview), &pa, &hres, &vres);
264			if (seq) {
265			if (ralrm > 0) {
266	greg	2.11	fprintf(stderr, "FRAME %d:", seq);
267			fprintview(&ourview, stderr);
268			putc('\n', stderr);
269			fflush(stderr);
270	greg	2.8	}
271			printf("FRAME=%d\n", seq);
272			}
273			fputs(VIEWSTR, stdout);
274			fprintview(&ourview, stdout);
275			putchar('\n');
276			if (pa < .99 \|\| pa > 1.01)
277			fputaspect(pa, stdout);
278			fputformat(COLRFMT, stdout);
279			putchar('\n');
280			if (zout != NULL)
281	greg	2.9	sprintf(cp=fbuf, zout, seq);
282	greg	2.8	else
283	greg	2.9	cp = NULL;
284			render(cp, prvr);
285	greg	2.8	prvr = NULL;
286	greg	2.26	npicts++;
287	greg	2.8	} while (seq++);
288	greg	2.26	/* check that we did something */
289			if (npicts == 0)
290			error(WARNING, "no output produced");
291	greg	2.8	}
292
293
294			nextview(fp) /* get next view from fp */
295			FILE *fp;
296			{
297	greg	2.9	char linebuf[256];
298	greg	2.8
299			while (fgets(linebuf, sizeof(linebuf), fp) != NULL)
300	greg	2.9	if (isview(linebuf) && sscanview(&ourview, linebuf) > 0)
301	greg	2.8	return(0);
302			return(EOF);
303			}
304
305
306	greg	1.11	render(zfile, oldfile) /* render the scene */
307			char zfile, oldfile;
308	greg	1.1	{
309	greg	1.16	extern long lseek();
310	greg	1.1	COLOR scanbar[MAXDIV+1]; / scanline arrays of pixel values */
311	greg	1.11	float zbar[MAXDIV+1]; / z values */
312	greg	2.2	char sampdens; / previous sample density */
313	greg	1.1	int ypos; /* current scanline */
314	greg	1.15	int ystep; /* current y step size */
315	greg	1.33	int hstep; /* h step size */
316	greg	1.16	int zfd;
317	greg	1.1	COLOR *colptr;
318	greg	1.11	float *zptr;
319	greg	1.1	register int i;
320	greg	1.9	/* allocate scanlines */
321	greg	1.1	for (i = 0; i <= psample; i++) {
322	greg	2.8	scanbar[i] = (COLOR )malloc(hressizeof(COLOR));
323	greg	1.1	if (scanbar[i] == NULL)
324	greg	1.11	goto memerr;
325	greg	1.1	}
326	greg	2.2	hstep = (psample140+49)/99; / quincunx sampling */
327			ystep = (psample*99+70)/140;
328			if (hstep > 2) {
329	greg	2.8	i = hres/hstep + 2;
330	greg	2.2	if ((sampdens = malloc(i)) == NULL)
331			goto memerr;
332			while (i--)
333			sampdens[i] = hstep;
334			} else
335			sampdens = NULL;
336	greg	2.26	/* open z-file */
337	greg	1.11	if (zfile != NULL) {
338	greg	1.16	if ((zfd = open(zfile, O_WRONLY\|O_CREAT, 0666)) == -1) {
339	greg	2.26	sprintf(errmsg, "cannot open z-file \"%s\"", zfile);
340	greg	1.11	error(SYSTEM, errmsg);
341			}
342	greg	2.17	#ifdef MSDOS
343			setmode(zfd, O_BINARY);
344			#endif
345	greg	1.11	for (i = 0; i <= psample; i++) {
346	greg	2.8	zbar[i] = (float )malloc(hressizeof(float));
347	greg	1.11	if (zbar[i] == NULL)
348			goto memerr;
349			}
350			} else {
351	greg	1.16	zfd = -1;
352	greg	1.11	for (i = 0; i <= psample; i++)
353			zbar[i] = NULL;
354			}
355	greg	1.1	/* write out boundaries */
356	greg	2.8	fprtresolu(hres, vres, stdout);
357	greg	1.10	/* recover file and compute first */
358	greg	1.11	i = salvage(oldfile);
359	greg	1.23	if (zfd != -1 && i > 0 &&
360	greg	2.8	lseek(zfd, (long)ihressizeof(float), 0) == -1)
361	greg	2.26	error(SYSTEM, "z-file seek error in render");
362	greg	2.8	pctdone = 100.0*i/vres;
363	greg	1.24	if (ralrm > 0) /* report init stats */
364			report();
365	greg	2.14	#ifndef BSD
366	greg	1.32	else
367			#endif
368	greg	2.22	signal(SIGCONT, report);
369	greg	2.8	ypos = vres-1 - i;
370			fillscanline(scanbar[0], zbar[0], sampdens, hres, ypos, hstep);
371	greg	1.10	/* compute scanlines */
372	greg	1.15	for (ypos -= ystep; ypos > -ystep; ypos -= ystep) {
373			/* bottom adjust? */
374			if (ypos < 0) {
375			ystep += ypos;
376			ypos = 0;
377			}
378			colptr = scanbar[ystep]; /* move base to top */
379			scanbar[ystep] = scanbar[0];
380	greg	1.1	scanbar[0] = colptr;
381	greg	1.15	zptr = zbar[ystep];
382			zbar[ystep] = zbar[0];
383	greg	1.11	zbar[0] = zptr;
384	greg	1.10	/* fill base line */
385	greg	2.2	fillscanline(scanbar[0], zbar[0], sampdens,
386	greg	2.8	hres, ypos, hstep);
387	greg	1.10	/* fill bar */
388	greg	2.8	fillscanbar(scanbar, zbar, hres, ypos, ystep);
389	greg	1.10	/* write it out */
390	greg	2.14	#ifndef BSD
391	greg	2.22	signal(SIGCONT, SIG_IGN); /* don't interrupt writes */
392	greg	1.32	#endif
393	greg	1.15	for (i = ystep; i > 0; i--) {
394	greg	1.17	if (zfd != -1 && write(zfd, (char *)zbar[i],
395	greg	2.8	hres*sizeof(float))
396			< hres*sizeof(float))
397	greg	1.1	goto writerr;
398	greg	2.8	if (fwritescan(scanbar[i], hres, stdout) < 0)
399	greg	1.11	goto writerr;
400			}
401	greg	1.1	if (fflush(stdout) == EOF)
402			goto writerr;
403	greg	1.24	/* record progress */
404	greg	2.8	pctdone = 100.0*(vres-1-ypos)/vres;
405	greg	1.24	if (ralrm > 0 && time((long *)0) >= tlastrept+ralrm)
406			report();
407	greg	2.14	#ifndef BSD
408	greg	1.32	else
409	greg	2.22	signal(SIGCONT, report);
410	greg	1.32	#endif
411	greg	1.1	}
412	greg	1.11	/* clean up */
413	greg	2.22	signal(SIGCONT, SIG_IGN);
414	greg	1.16	if (zfd != -1) {
415	greg	2.8	if (write(zfd, (char )zbar[0], hressizeof(float))
416			< hres*sizeof(float))
417	greg	1.11	goto writerr;
418	greg	1.20	if (close(zfd) == -1)
419			goto writerr;
420	greg	1.11	for (i = 0; i <= psample; i++)
421			free((char *)zbar[i]);
422			}
423	greg	2.8	fwritescan(scanbar[0], hres, stdout);
424	greg	1.10	if (fflush(stdout) == EOF)
425			goto writerr;
426	greg	1.1	for (i = 0; i <= psample; i++)
427			free((char *)scanbar[i]);
428	greg	2.2	if (sampdens != NULL)
429			free(sampdens);
430	greg	1.11	pctdone = 100.0;
431	greg	2.13	if (ralrm > 0)
432			report();
433	greg	2.23	signal(SIGCONT, SIG_DFL);
434	greg	1.1	return;
435			writerr:
436			error(SYSTEM, "write error in render");
437	greg	1.11	memerr:
438			error(SYSTEM, "out of memory in render");
439	greg	1.1	}
440
441
442	greg	2.2	fillscanline(scanline, zline, sd, xres, y, xstep) /* fill scan at y */
443	greg	2.14	register COLOR *scanline;
444			register float *zline;
445	greg	2.2	register char *sd;
446	greg	1.9	int xres, y, xstep;
447	greg	1.1	{
448	greg	1.33	static int nc = 0; /* number of calls */
449	greg	2.2	int bl = xstep, b = xstep;
450	greg	2.14	double z;
451	greg	1.1	register int i;
452
453	greg	1.11	z = pixvalue(scanline[0], 0, y);
454			if (zline) zline[0] = z;
455	greg	1.33	/* zig-zag start for quincunx pattern */
456	greg	2.2	for (i = ++nc & 1 ? xstep : xstep/2; i < xres-1+xstep; i += xstep) {
457	greg	1.15	if (i >= xres) {
458			xstep += xres-1-i;
459			i = xres-1;
460			}
461	greg	1.11	z = pixvalue(scanline[i], i, y);
462			if (zline) zline[i] = z;
463	greg	2.2	if (sd) b = sd[0] > sd[1] ? sd[0] : sd[1];
464	greg	2.3	if (i <= xstep)
465			b = fillsample(scanline, zline, 0, y, i, 0, b/2);
466			else
467			b = fillsample(scanline+i-xstep,
468			zline ? zline+i-xstep : NULL,
469			i-xstep, y, xstep, 0, b/2);
470	greg	2.2	if (sd) *sd++ = nc & 1 ? bl : b;
471			bl = b;
472	greg	1.1	}
473	greg	2.2	if (sd && nc & 1) *sd = bl;
474	greg	1.1	}
475
476
477	greg	1.11	fillscanbar(scanbar, zbar, xres, y, ysize) /* fill interior */
478	greg	2.14	register COLOR *scanbar[];
479			register float *zbar[];
480	greg	1.9	int xres, y, ysize;
481	greg	1.1	{
482			COLOR vline[MAXDIV+1];
483	greg	1.11	float zline[MAXDIV+1];
484	greg	1.1	int b = ysize;
485			register int i, j;
486
487	greg	1.8	for (i = 0; i < xres; i++) {
488	greg	1.1
489			copycolor(vline[0], scanbar[0][i]);
490			copycolor(vline[ysize], scanbar[ysize][i]);
491	greg	1.11	if (zbar[0]) {
492			zline[0] = zbar[0][i];
493			zline[ysize] = zbar[ysize][i];
494			}
495	greg	1.1
496	greg	1.11	b = fillsample(vline, zbar[0] ? zline : NULL,
497			i, y, 0, ysize, b/2);
498	greg	1.1
499			for (j = 1; j < ysize; j++)
500			copycolor(scanbar[j][i], vline[j]);
501	greg	1.11	if (zbar[0])
502			for (j = 1; j < ysize; j++)
503			zbar[j][i] = zline[j];
504	greg	1.1	}
505			}
506
507
508			int
509	greg	2.14	fillsample(colline, zline, x, y, xlen, ylen, b) /* fill interior points */
510			register COLOR *colline;
511			register float *zline;
512	greg	1.1	int x, y;
513			int xlen, ylen;
514			int b;
515			{
516	greg	2.14	double ratio;
517			double z;
518	greg	1.1	COLOR ctmp;
519			int ncut;
520			register int len;
521
522			if (xlen > 0) /* x or y length is zero */
523			len = xlen;
524			else
525			len = ylen;
526
527			if (len <= 1) /* limit recursion */
528			return(0);
529
530	greg	1.11	if (b > 0
531			\|\| (zline && 2.fabs(zline[0]-zline[len]) > maxdiff(zline[0]+zline[len]))
532			\|\| bigdiff(colline[0], colline[len], maxdiff)) {
533	greg	1.1
534	greg	1.11	z = pixvalue(colline[len>>1], x + (xlen>>1), y + (ylen>>1));
535			if (zline) zline[len>>1] = z;
536	greg	1.1	ncut = 1;
537
538			} else { /* interpolate */
539
540			copycolor(colline[len>>1], colline[len]);
541			ratio = (double)(len>>1) / len;
542			scalecolor(colline[len>>1], ratio);
543	greg	1.11	if (zline) zline[len>>1] = zline[len] * ratio;
544			ratio = 1.0 - ratio;
545	greg	1.1	copycolor(ctmp, colline[0]);
546			scalecolor(ctmp, ratio);
547			addcolor(colline[len>>1], ctmp);
548	greg	1.11	if (zline) zline[len>>1] += zline[0] * ratio;
549	greg	1.1	ncut = 0;
550			}
551			/* recurse */
552	greg	1.11	ncut += fillsample(colline, zline, x, y, xlen>>1, ylen>>1, (b-1)/2);
553	greg	1.1
554	greg	1.11	ncut += fillsample(colline+(len>>1), zline ? zline+(len>>1) : NULL,
555			x+(xlen>>1), y+(ylen>>1),
556			xlen-(xlen>>1), ylen-(ylen>>1), b/2);
557	greg	1.1
558			return(ncut);
559			}
560
561
562	greg	1.11	double
563	greg	1.1	pixvalue(col, x, y) /* compute pixel value */
564			COLOR col; /* returned color */
565			int x, y; /* pixel position */
566			{
567	greg	1.25	static RAY thisray;
568	greg	1.1
569	greg	1.22	if (viewray(thisray.rorg, thisray.rdir, &ourview,
570	greg	2.8	(x+pixjitter())/hres, (y+pixjitter())/vres) < 0) {
571	greg	1.22	setcolor(col, 0.0, 0.0, 0.0);
572			return(0.0);
573			}
574	greg	1.1
575			rayorigin(&thisray, NULL, PRIMARY, 1.0);
576	greg	1.25
577	greg	2.8	samplendx = pixnumber(x,y,hres,vres); /* set pixel index */
578	greg	1.25
579	greg	1.1	rayvalue(&thisray); /* trace ray */
580
581			copycolor(col, thisray.rcol); /* return color */
582	greg	1.11
583	greg	1.20	return(thisray.rt); /* return distance */
584	greg	1.1	}
585
586
587			int
588			salvage(oldfile) /* salvage scanlines from killed program */
589			char *oldfile;
590			{
591			COLR *scanline;
592			FILE *fp;
593			int x, y;
594
595			if (oldfile == NULL)
596			return(0);
597	greg	1.9
598			if ((fp = fopen(oldfile, "r")) == NULL) {
599	greg	1.1	sprintf(errmsg, "cannot open recover file \"%s\"", oldfile);
600			error(WARNING, errmsg);
601			return(0);
602			}
603	greg	2.17	#ifdef MSDOS
604			setmode(fileno(fp), O_BINARY);
605			#endif
606	greg	1.1	/* discard header */
607	greg	2.19	getheader(fp, NULL, NULL);
608	greg	1.1	/* get picture size */
609	greg	1.36	if (!fscnresolu(&x, &y, fp)) {
610	greg	2.29	sprintf(errmsg, "bad recover file \"%s\" - not removed",
611			oldfile);
612	greg	1.2	error(WARNING, errmsg);
613	greg	1.1	fclose(fp);
614			return(0);
615			}
616
617	greg	2.8	if (x != hres \|\| y != vres) {
618	greg	1.1	sprintf(errmsg, "resolution mismatch in recover file \"%s\"",
619			oldfile);
620			error(USER, errmsg);
621			}
622
623	greg	2.8	scanline = (COLR )malloc(hressizeof(COLR));
624	greg	1.1	if (scanline == NULL)
625			error(SYSTEM, "out of memory in salvage");
626	greg	2.8	for (y = 0; y < vres; y++) {
627			if (freadcolrs(scanline, hres, fp) < 0)
628	greg	1.1	break;
629	greg	2.8	if (fwritecolrs(scanline, hres, stdout) < 0)
630	greg	1.1	goto writerr;
631			}
632			if (fflush(stdout) == EOF)
633			goto writerr;
634			free((char *)scanline);
635			fclose(fp);
636			unlink(oldfile);
637			return(y);
638			writerr:
639	greg	2.9	sprintf(errmsg, "write error during recovery of \"%s\"", oldfile);
640			error(SYSTEM, errmsg);
641	greg	1.31	}
642
643
644			int
645			pixnumber(x, y, xres, yres) /* compute pixel index (brushed) */
646			register int x, y;
647			int xres, yres;
648			{
649			x -= y;
650			while (x < 0)
651			x += xres;
652			return((((x>>2)*yres + y) << 2) + (x & 3));
653	greg	1.1	}