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"

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 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();


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, "%ld 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, "%ld rays, %4.2f%% done after %5.4f hours\n",
                        nrays, pctdone, (tlastrept-tstart)/3600.0);
        eputs(errmsg);
        signal(SIGALRM, 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];
        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 && errno != ENOENT) {
                                sprintf(errmsg,
                                        "cannot rename \"%s\" to \"%s\"",
                                                fbuf, prvr);
                                error(SYSTEM, errmsg);
                        }
                }
        }
                                        /* render sequence */
        do {
                if (seq && nextview(stdin) == EOF)
                        break;
                if (pout != NULL) {
                        sprintf(fbuf, pout, seq);
                        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;
        } while (seq++);
}


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(SIGALRM, 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(SIGALRM, 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(SIGALRM, report);
#endif
        }
                                                /* clean up */
        signal(SIGALRM, 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();
        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\"", 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:	2.21
Committed:	Wed Jan 20 15:19:47 1993 UTC (31 years, 3 months ago) by greg
Content type:	text/plain
Branch:	MAIN
Changes since 2.20:	+5 -39 lines
Log Message:	added -P and -PP persist options
#	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	1.25	int dimlist[MAXDIM]; /* sampling dimensions */
33			int ndims = 0; /* number of sampling dimensions */
34			int samplendx; /* sample index number */
35
36	greg	1.12	VIEW ourview = STDVIEW; /* view parameters */
37			int hresolu = 512; /* horizontal resolution */
38			int vresolu = 512; /* vertical resolution */
39	greg	2.14	double pixaspect = 1.0; /* pixel aspect ratio */
40	greg	1.1
41			int psample = 4; /* pixel sample size */
42	greg	2.14	double maxdiff = .05; /* max. difference for interpolation */
43			double dstrpix = 0.67; /* square pixel distribution */
44	greg	1.1
45	greg	2.14	double dstrsrc = 0.0; /* square source distribution */
46			double shadthresh = .05; /* shadow threshold */
47			double shadcert = .5; /* shadow certainty */
48	greg	1.35	int directrelay = 1; /* number of source relays */
49	greg	1.29	int vspretest = 512; /* virtual source pretest density */
50	greg	2.20	int directvis = 1; /* sources visible? */
51	greg	2.14	double srcsizerat = .25; /* maximum ratio source size/dist. */
52	greg	1.1
53	greg	2.14	double specthresh = .15; /* specular sampling threshold */
54			double specjitter = 1.; /* specular sampling jitter */
55	greg	2.5
56	greg	1.1	int maxdepth = 6; /* maximum recursion depth */
57	greg	2.14	double minweight = 5e-3; /* minimum ray weight */
58	greg	1.1
59			COLOR ambval = BLKCOLOR; /* ambient value */
60	greg	2.14	double ambacc = 0.2; /* ambient accuracy */
61	greg	1.6	int ambres = 32; /* ambient resolution */
62	greg	1.1	int ambdiv = 128; /* ambient divisions */
63			int ambssamp = 0; /* ambient super-samples */
64			int ambounce = 0; /* ambient bounces */
65			char amblist[128]; / ambient include/exclude list */
66			int ambincl = -1; /* include == 1, exclude == 0 */
67
68	greg	2.16	#ifdef MSDOS
69			int ralrm = 60; /* seconds between reports */
70			#else
71	greg	1.1	int ralrm = 0; /* seconds between reports */
72	greg	2.16	#endif
73	greg	1.1
74	greg	2.14	double pctdone = 0.0; /* percentage done */
75	greg	1.1
76	greg	1.24	long tlastrept = 0L; /* time at last report */
77
78			extern long time();
79			extern long tstart; /* starting time */
80
81	greg	1.1	extern long nrays; /* number of rays traced */
82
83	greg	2.14	#define MAXDIV 16 /* maximum sample size */
84	greg	1.1
85	greg	2.14	#define pixjitter() (.5+dstrpix*(.5-frandom()))
86	greg	1.1
87	greg	2.8	static int hres, vres; /* resolution for this frame */
88
89			extern char *mktemp();
90
91	greg	2.14	double pixvalue();
92	greg	1.1
93	greg	1.11
94	greg	1.1	quit(code) /* quit program */
95			int code;
96			{
97	greg	2.8	if (code) /* report status */
98	greg	1.1	report();
99	greg	2.21	headclean(); /* delete header file */
100			pfclean(); /* clean up persist files */
101	greg	1.1	exit(code);
102			}
103
104
105	greg	1.24	#ifdef BSD
106	greg	1.1	report() /* report progress */
107			{
108			struct rusage rubuf;
109	greg	2.14	double t;
110	greg	1.1
111			getrusage(RUSAGE_SELF, &rubuf);
112			t = (rubuf.ru_utime.tv_usec + rubuf.ru_stime.tv_usec) / 1e6;
113			t += rubuf.ru_utime.tv_sec + rubuf.ru_stime.tv_sec;
114			getrusage(RUSAGE_CHILDREN, &rubuf);
115			t += (rubuf.ru_utime.tv_usec + rubuf.ru_stime.tv_usec) / 1e6;
116			t += rubuf.ru_utime.tv_sec + rubuf.ru_stime.tv_sec;
117
118			sprintf(errmsg, "%ld rays, %4.2f%% done after %5.4f CPU hours\n",
119			nrays, pctdone, t/3600.0);
120	greg	1.24	eputs(errmsg);
121			tlastrept = time((long *)0);
122			}
123	greg	1.1	#else
124	greg	1.24	report() /* report progress */
125			{
126			tlastrept = time((long *)0);
127			sprintf(errmsg, "%ld rays, %4.2f%% done after %5.4f hours\n",
128			nrays, pctdone, (tlastrept-tstart)/3600.0);
129	greg	1.1	eputs(errmsg);
130	greg	2.4	signal(SIGALRM, report);
131	greg	1.1	}
132	greg	1.24	#endif
133	greg	1.1
134
135	greg	2.8	rpict(seq, pout, zout, prvr) /* generate image(s) */
136			int seq;
137			char pout, zout, *prvr;
138			/*
139			* If seq is greater than zero, then we will render a sequence of
140			* images based on view parameter strings read from the standard input.
141			* If pout is NULL, then all images will be sent to the standard ouput.
142			* If seq is greater than zero and prvr is an integer, then it is the
143			* frame number at which rendering should begin. Preceeding view parameter
144			* strings will be skipped in the input.
145			* If pout and prvr are the same, prvr is renamed to avoid overwriting.
146			* Note that pout and zout should contain %d format specifications for
147			* sequenced file naming.
148			*/
149			{
150	greg	2.21	extern char rindex(), strncpy(), strcat(), strcpy();
151	greg	2.9	char fbuf[128], fbuf2[128];
152			register char *cp;
153	greg	2.14	RESOLU rs;
154			double pa;
155	greg	2.8	/* check sampling */
156			if (psample < 1)
157			psample = 1;
158			else if (psample > MAXDIV) {
159			sprintf(errmsg, "pixel sampling reduced from %d to %d",
160			psample, MAXDIV);
161			error(WARNING, errmsg);
162			psample = MAXDIV;
163			}
164			/* get starting frame */
165			if (seq <= 0)
166			seq = 0;
167			else if (prvr != NULL && isint(prvr)) {
168	greg	2.9	register int rn; /* skip to specified view */
169	greg	2.8	if ((rn = atoi(prvr)) < seq)
170			error(USER, "recover frame less than start frame");
171			if (pout == NULL)
172			error(USER, "missing output file specification");
173			for ( ; seq < rn; seq++)
174			if (nextview(stdin) == EOF)
175			error(USER, "unexpected EOF on view input");
176			prvr = fbuf; /* mark for renaming */
177			}
178	greg	2.18	if (pout != NULL & prvr != NULL) {
179	greg	2.8	sprintf(fbuf, pout, seq);
180	greg	2.18	if (!strcmp(prvr, fbuf)) { /* rename */
181			strcpy(fbuf2, fbuf);
182			for (cp = fbuf2; *cp; cp++)
183			;
184			while (cp > fbuf2 && !ISDIRSEP(cp[-1]))
185			cp--;
186			strcpy(cp, RFTEMPLATE);
187	greg	2.8	prvr = mktemp(fbuf2);
188			if (rename(fbuf, prvr) < 0 && errno != ENOENT) {
189			sprintf(errmsg,
190			"cannot rename \"%s\" to \"%s\"",
191			fbuf, prvr);
192			error(SYSTEM, errmsg);
193			}
194			}
195			}
196			/* render sequence */
197			do {
198			if (seq && nextview(stdin) == EOF)
199			break;
200			if (pout != NULL) {
201			sprintf(fbuf, pout, seq);
202			if (freopen(fbuf, "w", stdout) == NULL) {
203			sprintf(errmsg,
204			"cannot open output file \"%s\"", fbuf);
205			error(SYSTEM, errmsg);
206			}
207	greg	2.17	#ifdef MSDOS
208			setmode(fileno(stdout), O_BINARY);
209			#endif
210	greg	2.8	dupheader();
211			}
212			hres = hresolu; vres = vresolu; pa = pixaspect;
213			if (prvr != NULL)
214			if (viewfile(prvr, &ourview, &rs) <= 0
215			\|\| rs.or != PIXSTANDARD) {
216			sprintf(errmsg,
217			"cannot recover view parameters from \"%s\"", prvr);
218			error(WARNING, errmsg);
219			} else {
220			pa = 0.0;
221			hres = scanlen(&rs);
222			vres = numscans(&rs);
223			}
224	greg	2.9	if ((cp = setview(&ourview)) != NULL)
225			error(USER, cp);
226	greg	2.8	normaspect(viewaspect(&ourview), &pa, &hres, &vres);
227			if (seq) {
228			if (ralrm > 0) {
229	greg	2.11	fprintf(stderr, "FRAME %d:", seq);
230			fprintview(&ourview, stderr);
231			putc('\n', stderr);
232			fflush(stderr);
233	greg	2.8	}
234			printf("FRAME=%d\n", seq);
235			}
236			fputs(VIEWSTR, stdout);
237			fprintview(&ourview, stdout);
238			putchar('\n');
239			if (pa < .99 \|\| pa > 1.01)
240			fputaspect(pa, stdout);
241			fputformat(COLRFMT, stdout);
242			putchar('\n');
243			if (zout != NULL)
244	greg	2.9	sprintf(cp=fbuf, zout, seq);
245	greg	2.8	else
246	greg	2.9	cp = NULL;
247			render(cp, prvr);
248	greg	2.8	prvr = NULL;
249			} while (seq++);
250			}
251
252
253			nextview(fp) /* get next view from fp */
254			FILE *fp;
255			{
256	greg	2.9	char linebuf[256];
257	greg	2.8
258			while (fgets(linebuf, sizeof(linebuf), fp) != NULL)
259	greg	2.9	if (isview(linebuf) && sscanview(&ourview, linebuf) > 0)
260	greg	2.8	return(0);
261			return(EOF);
262			}
263
264
265	greg	1.11	render(zfile, oldfile) /* render the scene */
266			char zfile, oldfile;
267	greg	1.1	{
268	greg	1.16	extern long lseek();
269	greg	1.1	COLOR scanbar[MAXDIV+1]; / scanline arrays of pixel values */
270	greg	1.11	float zbar[MAXDIV+1]; / z values */
271	greg	2.2	char sampdens; / previous sample density */
272	greg	1.1	int ypos; /* current scanline */
273	greg	1.15	int ystep; /* current y step size */
274	greg	1.33	int hstep; /* h step size */
275	greg	1.16	int zfd;
276	greg	1.1	COLOR *colptr;
277	greg	1.11	float *zptr;
278	greg	1.1	register int i;
279	greg	1.9	/* allocate scanlines */
280	greg	1.1	for (i = 0; i <= psample; i++) {
281	greg	2.8	scanbar[i] = (COLOR )malloc(hressizeof(COLOR));
282	greg	1.1	if (scanbar[i] == NULL)
283	greg	1.11	goto memerr;
284	greg	1.1	}
285	greg	2.2	hstep = (psample140+49)/99; / quincunx sampling */
286			ystep = (psample*99+70)/140;
287			if (hstep > 2) {
288	greg	2.8	i = hres/hstep + 2;
289	greg	2.2	if ((sampdens = malloc(i)) == NULL)
290			goto memerr;
291			while (i--)
292			sampdens[i] = hstep;
293			} else
294			sampdens = NULL;
295	greg	1.11	/* open z file */
296			if (zfile != NULL) {
297	greg	1.16	if ((zfd = open(zfile, O_WRONLY\|O_CREAT, 0666)) == -1) {
298	greg	1.11	sprintf(errmsg, "cannot open z file \"%s\"", zfile);
299			error(SYSTEM, errmsg);
300			}
301	greg	2.17	#ifdef MSDOS
302			setmode(zfd, O_BINARY);
303			#endif
304	greg	1.11	for (i = 0; i <= psample; i++) {
305	greg	2.8	zbar[i] = (float )malloc(hressizeof(float));
306	greg	1.11	if (zbar[i] == NULL)
307			goto memerr;
308			}
309			} else {
310	greg	1.16	zfd = -1;
311	greg	1.11	for (i = 0; i <= psample; i++)
312			zbar[i] = NULL;
313			}
314	greg	1.1	/* write out boundaries */
315	greg	2.8	fprtresolu(hres, vres, stdout);
316	greg	1.10	/* recover file and compute first */
317	greg	1.11	i = salvage(oldfile);
318	greg	1.23	if (zfd != -1 && i > 0 &&
319	greg	2.8	lseek(zfd, (long)ihressizeof(float), 0) == -1)
320	greg	1.11	error(SYSTEM, "z file seek error in render");
321	greg	2.8	pctdone = 100.0*i/vres;
322	greg	1.24	if (ralrm > 0) /* report init stats */
323			report();
324	greg	2.14	#ifndef BSD
325	greg	1.32	else
326			#endif
327			signal(SIGALRM, report);
328	greg	2.8	ypos = vres-1 - i;
329			fillscanline(scanbar[0], zbar[0], sampdens, hres, ypos, hstep);
330	greg	1.10	/* compute scanlines */
331	greg	1.15	for (ypos -= ystep; ypos > -ystep; ypos -= ystep) {
332			/* bottom adjust? */
333			if (ypos < 0) {
334			ystep += ypos;
335			ypos = 0;
336			}
337			colptr = scanbar[ystep]; /* move base to top */
338			scanbar[ystep] = scanbar[0];
339	greg	1.1	scanbar[0] = colptr;
340	greg	1.15	zptr = zbar[ystep];
341			zbar[ystep] = zbar[0];
342	greg	1.11	zbar[0] = zptr;
343	greg	1.10	/* fill base line */
344	greg	2.2	fillscanline(scanbar[0], zbar[0], sampdens,
345	greg	2.8	hres, ypos, hstep);
346	greg	1.10	/* fill bar */
347	greg	2.8	fillscanbar(scanbar, zbar, hres, ypos, ystep);
348	greg	1.10	/* write it out */
349	greg	2.14	#ifndef BSD
350	greg	1.32	signal(SIGALRM, SIG_IGN); /* don't interrupt writes */
351			#endif
352	greg	1.15	for (i = ystep; i > 0; i--) {
353	greg	1.17	if (zfd != -1 && write(zfd, (char *)zbar[i],
354	greg	2.8	hres*sizeof(float))
355			< hres*sizeof(float))
356	greg	1.1	goto writerr;
357	greg	2.8	if (fwritescan(scanbar[i], hres, stdout) < 0)
358	greg	1.11	goto writerr;
359			}
360	greg	1.1	if (fflush(stdout) == EOF)
361			goto writerr;
362	greg	1.24	/* record progress */
363	greg	2.8	pctdone = 100.0*(vres-1-ypos)/vres;
364	greg	1.24	if (ralrm > 0 && time((long *)0) >= tlastrept+ralrm)
365			report();
366	greg	2.14	#ifndef BSD
367	greg	1.32	else
368			signal(SIGALRM, report);
369			#endif
370	greg	1.1	}
371	greg	1.11	/* clean up */
372	greg	2.7	signal(SIGALRM, SIG_IGN);
373	greg	1.16	if (zfd != -1) {
374	greg	2.8	if (write(zfd, (char )zbar[0], hressizeof(float))
375			< hres*sizeof(float))
376	greg	1.11	goto writerr;
377	greg	1.20	if (close(zfd) == -1)
378			goto writerr;
379	greg	1.11	for (i = 0; i <= psample; i++)
380			free((char *)zbar[i]);
381			}
382	greg	2.8	fwritescan(scanbar[0], hres, stdout);
383	greg	1.10	if (fflush(stdout) == EOF)
384			goto writerr;
385	greg	1.1	for (i = 0; i <= psample; i++)
386			free((char *)scanbar[i]);
387	greg	2.2	if (sampdens != NULL)
388			free(sampdens);
389	greg	1.11	pctdone = 100.0;
390	greg	2.13	if (ralrm > 0)
391			report();
392	greg	1.1	return;
393			writerr:
394			error(SYSTEM, "write error in render");
395	greg	1.11	memerr:
396			error(SYSTEM, "out of memory in render");
397	greg	1.1	}
398
399
400	greg	2.2	fillscanline(scanline, zline, sd, xres, y, xstep) /* fill scan at y */
401	greg	2.14	register COLOR *scanline;
402			register float *zline;
403	greg	2.2	register char *sd;
404	greg	1.9	int xres, y, xstep;
405	greg	1.1	{
406	greg	1.33	static int nc = 0; /* number of calls */
407	greg	2.2	int bl = xstep, b = xstep;
408	greg	2.14	double z;
409	greg	1.1	register int i;
410
411	greg	1.11	z = pixvalue(scanline[0], 0, y);
412			if (zline) zline[0] = z;
413	greg	1.33	/* zig-zag start for quincunx pattern */
414	greg	2.2	for (i = ++nc & 1 ? xstep : xstep/2; i < xres-1+xstep; i += xstep) {
415	greg	1.15	if (i >= xres) {
416			xstep += xres-1-i;
417			i = xres-1;
418			}
419	greg	1.11	z = pixvalue(scanline[i], i, y);
420			if (zline) zline[i] = z;
421	greg	2.2	if (sd) b = sd[0] > sd[1] ? sd[0] : sd[1];
422	greg	2.3	if (i <= xstep)
423			b = fillsample(scanline, zline, 0, y, i, 0, b/2);
424			else
425			b = fillsample(scanline+i-xstep,
426			zline ? zline+i-xstep : NULL,
427			i-xstep, y, xstep, 0, b/2);
428	greg	2.2	if (sd) *sd++ = nc & 1 ? bl : b;
429			bl = b;
430	greg	1.1	}
431	greg	2.2	if (sd && nc & 1) *sd = bl;
432	greg	1.1	}
433
434
435	greg	1.11	fillscanbar(scanbar, zbar, xres, y, ysize) /* fill interior */
436	greg	2.14	register COLOR *scanbar[];
437			register float *zbar[];
438	greg	1.9	int xres, y, ysize;
439	greg	1.1	{
440			COLOR vline[MAXDIV+1];
441	greg	1.11	float zline[MAXDIV+1];
442	greg	1.1	int b = ysize;
443			register int i, j;
444
445	greg	1.8	for (i = 0; i < xres; i++) {
446	greg	1.1
447			copycolor(vline[0], scanbar[0][i]);
448			copycolor(vline[ysize], scanbar[ysize][i]);
449	greg	1.11	if (zbar[0]) {
450			zline[0] = zbar[0][i];
451			zline[ysize] = zbar[ysize][i];
452			}
453	greg	1.1
454	greg	1.11	b = fillsample(vline, zbar[0] ? zline : NULL,
455			i, y, 0, ysize, b/2);
456	greg	1.1
457			for (j = 1; j < ysize; j++)
458			copycolor(scanbar[j][i], vline[j]);
459	greg	1.11	if (zbar[0])
460			for (j = 1; j < ysize; j++)
461			zbar[j][i] = zline[j];
462	greg	1.1	}
463			}
464
465
466			int
467	greg	2.14	fillsample(colline, zline, x, y, xlen, ylen, b) /* fill interior points */
468			register COLOR *colline;
469			register float *zline;
470	greg	1.1	int x, y;
471			int xlen, ylen;
472			int b;
473			{
474	greg	2.14	double ratio;
475			double z;
476	greg	1.1	COLOR ctmp;
477			int ncut;
478			register int len;
479
480			if (xlen > 0) /* x or y length is zero */
481			len = xlen;
482			else
483			len = ylen;
484
485			if (len <= 1) /* limit recursion */
486			return(0);
487
488	greg	1.11	if (b > 0
489			\|\| (zline && 2.fabs(zline[0]-zline[len]) > maxdiff(zline[0]+zline[len]))
490			\|\| bigdiff(colline[0], colline[len], maxdiff)) {
491	greg	1.1
492	greg	1.11	z = pixvalue(colline[len>>1], x + (xlen>>1), y + (ylen>>1));
493			if (zline) zline[len>>1] = z;
494	greg	1.1	ncut = 1;
495
496			} else { /* interpolate */
497
498			copycolor(colline[len>>1], colline[len]);
499			ratio = (double)(len>>1) / len;
500			scalecolor(colline[len>>1], ratio);
501	greg	1.11	if (zline) zline[len>>1] = zline[len] * ratio;
502			ratio = 1.0 - ratio;
503	greg	1.1	copycolor(ctmp, colline[0]);
504			scalecolor(ctmp, ratio);
505			addcolor(colline[len>>1], ctmp);
506	greg	1.11	if (zline) zline[len>>1] += zline[0] * ratio;
507	greg	1.1	ncut = 0;
508			}
509			/* recurse */
510	greg	1.11	ncut += fillsample(colline, zline, x, y, xlen>>1, ylen>>1, (b-1)/2);
511	greg	1.1
512	greg	1.11	ncut += fillsample(colline+(len>>1), zline ? zline+(len>>1) : NULL,
513			x+(xlen>>1), y+(ylen>>1),
514			xlen-(xlen>>1), ylen-(ylen>>1), b/2);
515	greg	1.1
516			return(ncut);
517			}
518
519
520	greg	1.11	double
521	greg	1.1	pixvalue(col, x, y) /* compute pixel value */
522			COLOR col; /* returned color */
523			int x, y; /* pixel position */
524			{
525	greg	1.25	static RAY thisray;
526	greg	1.1
527	greg	1.22	if (viewray(thisray.rorg, thisray.rdir, &ourview,
528	greg	2.8	(x+pixjitter())/hres, (y+pixjitter())/vres) < 0) {
529	greg	1.22	setcolor(col, 0.0, 0.0, 0.0);
530			return(0.0);
531			}
532	greg	1.1
533			rayorigin(&thisray, NULL, PRIMARY, 1.0);
534	greg	1.25
535	greg	2.8	samplendx = pixnumber(x,y,hres,vres); /* set pixel index */
536	greg	1.25
537	greg	1.1	rayvalue(&thisray); /* trace ray */
538
539			copycolor(col, thisray.rcol); /* return color */
540	greg	1.11
541	greg	1.20	return(thisray.rt); /* return distance */
542	greg	1.1	}
543
544
545			int
546			salvage(oldfile) /* salvage scanlines from killed program */
547			char *oldfile;
548			{
549			COLR *scanline;
550			FILE *fp;
551			int x, y;
552
553			if (oldfile == NULL)
554			return(0);
555	greg	1.9
556			if ((fp = fopen(oldfile, "r")) == NULL) {
557	greg	1.1	sprintf(errmsg, "cannot open recover file \"%s\"", oldfile);
558			error(WARNING, errmsg);
559			return(0);
560			}
561	greg	2.17	#ifdef MSDOS
562			setmode(fileno(fp), O_BINARY);
563			#endif
564	greg	1.1	/* discard header */
565	greg	2.19	getheader(fp, NULL, NULL);
566	greg	1.1	/* get picture size */
567	greg	1.36	if (!fscnresolu(&x, &y, fp)) {
568	greg	1.2	sprintf(errmsg, "bad recover file \"%s\"", oldfile);
569			error(WARNING, errmsg);
570	greg	1.1	fclose(fp);
571			return(0);
572			}
573
574	greg	2.8	if (x != hres \|\| y != vres) {
575	greg	1.1	sprintf(errmsg, "resolution mismatch in recover file \"%s\"",
576			oldfile);
577			error(USER, errmsg);
578			}
579
580	greg	2.8	scanline = (COLR )malloc(hressizeof(COLR));
581	greg	1.1	if (scanline == NULL)
582			error(SYSTEM, "out of memory in salvage");
583	greg	2.8	for (y = 0; y < vres; y++) {
584			if (freadcolrs(scanline, hres, fp) < 0)
585	greg	1.1	break;
586	greg	2.8	if (fwritecolrs(scanline, hres, stdout) < 0)
587	greg	1.1	goto writerr;
588			}
589			if (fflush(stdout) == EOF)
590			goto writerr;
591			free((char *)scanline);
592			fclose(fp);
593			unlink(oldfile);
594			return(y);
595			writerr:
596	greg	2.9	sprintf(errmsg, "write error during recovery of \"%s\"", oldfile);
597			error(SYSTEM, errmsg);
598	greg	1.31	}
599
600
601			int
602			pixnumber(x, y, xres, yres) /* compute pixel index (brushed) */
603			register int x, y;
604			int xres, yres;
605			{
606			x -= y;
607			while (x < 0)
608			x += xres;
609			return((((x>>2)*yres + y) << 2) + (x & 3));
610	greg	1.1	}