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"

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  directinvis = 0;                   /* sources invisible? */
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()))

#define  RFTEMPLATE     "rfXXXXXX"
#define  HFTEMPLATE     TEMPLATE

static char  *hfname = NULL;            /* header file name */
static FILE  *hfp = NULL;               /* header file pointer */

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

extern char  *mktemp();

double  pixvalue();


quit(code)                      /* quit program */
int  code;
{
        if (code)                       /* report status */
                report();
        if (hfname != NULL) {           /* delete header file */
                if (hfp != NULL)
                        fclose(hfp);
                unlink(hfname);
        }
        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


openheader()                    /* save standard output to header file */
{
        hfname = mktemp(HFTEMPLATE);
        if (freopen(hfname, "w", stdout) == NULL) {
                sprintf(errmsg, "cannot open header file \"%s\"", hfname);
                error(SYSTEM, errmsg);
        }
}


dupheader()                     /* repeat header on standard output */
{
        register int  c;

        if (hfp == NULL) {
                if ((hfp = fopen(hfname, "r")) == NULL)
                        error(SYSTEM, "error reopening header file");
#ifdef MSDOS
                setmode(fileno(hfp), O_BINARY);
#endif
        } else if (fseek(hfp, 0L, 0) < 0)
                error(SYSTEM, "seek error on header file");
        while ((c = getc(hfp)) != EOF)
                putchar(c);
}


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();
        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:	2.19
Committed:	Thu Nov 12 10:11:53 1992 UTC (31 years, 5 months ago) by greg
Content type:	text/plain
Branch:	MAIN
Changes since 2.18:	+1 -1 lines
Log Message:	fixed call to getheader() to pass 3 arguments always (DOS bug fix)
#	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	1.25	int dimlist[MAXDIM]; /* sampling dimensions */
31			int ndims = 0; /* number of sampling dimensions */
32			int samplendx; /* sample index number */
33
34	greg	1.12	VIEW ourview = STDVIEW; /* view parameters */
35			int hresolu = 512; /* horizontal resolution */
36			int vresolu = 512; /* vertical resolution */
37	greg	2.14	double pixaspect = 1.0; /* pixel aspect ratio */
38	greg	1.1
39			int psample = 4; /* pixel sample size */
40	greg	2.14	double maxdiff = .05; /* max. difference for interpolation */
41			double dstrpix = 0.67; /* square pixel distribution */
42	greg	1.1
43	greg	2.14	double dstrsrc = 0.0; /* square source distribution */
44			double shadthresh = .05; /* shadow threshold */
45			double shadcert = .5; /* shadow certainty */
46	greg	1.35	int directrelay = 1; /* number of source relays */
47	greg	1.29	int vspretest = 512; /* virtual source pretest density */
48	greg	1.30	int directinvis = 0; /* sources invisible? */
49	greg	2.14	double srcsizerat = .25; /* maximum ratio source size/dist. */
50	greg	1.1
51	greg	2.14	double specthresh = .15; /* specular sampling threshold */
52			double specjitter = 1.; /* specular sampling jitter */
53	greg	2.5
54	greg	1.1	int maxdepth = 6; /* maximum recursion depth */
55	greg	2.14	double minweight = 5e-3; /* minimum ray weight */
56	greg	1.1
57			COLOR ambval = BLKCOLOR; /* ambient value */
58	greg	2.14	double ambacc = 0.2; /* ambient accuracy */
59	greg	1.6	int ambres = 32; /* ambient resolution */
60	greg	1.1	int ambdiv = 128; /* ambient divisions */
61			int ambssamp = 0; /* ambient super-samples */
62			int ambounce = 0; /* ambient bounces */
63			char amblist[128]; / ambient include/exclude list */
64			int ambincl = -1; /* include == 1, exclude == 0 */
65
66	greg	2.16	#ifdef MSDOS
67			int ralrm = 60; /* seconds between reports */
68			#else
69	greg	1.1	int ralrm = 0; /* seconds between reports */
70	greg	2.16	#endif
71	greg	1.1
72	greg	2.14	double pctdone = 0.0; /* percentage done */
73	greg	1.1
74	greg	1.24	long tlastrept = 0L; /* time at last report */
75
76			extern long time();
77			extern long tstart; /* starting time */
78
79	greg	1.1	extern long nrays; /* number of rays traced */
80
81	greg	2.14	#define MAXDIV 16 /* maximum sample size */
82	greg	1.1
83	greg	2.14	#define pixjitter() (.5+dstrpix*(.5-frandom()))
84	greg	1.1
85	greg	2.14	#define RFTEMPLATE "rfXXXXXX"
86			#define HFTEMPLATE TEMPLATE
87	greg	2.8
88			static char hfname = NULL; / header file name */
89			static FILE hfp = NULL; / header file pointer */
90
91			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	1.11
98	greg	1.1	quit(code) /* quit program */
99			int code;
100			{
101	greg	2.8	if (code) /* report status */
102	greg	1.1	report();
103	greg	2.8	if (hfname != NULL) { /* delete header file */
104			if (hfp != NULL)
105			fclose(hfp);
106			unlink(hfname);
107			}
108	greg	1.1	exit(code);
109			}
110
111
112	greg	1.24	#ifdef BSD
113	greg	1.1	report() /* report progress */
114			{
115			struct rusage rubuf;
116	greg	2.14	double t;
117	greg	1.1
118			getrusage(RUSAGE_SELF, &rubuf);
119			t = (rubuf.ru_utime.tv_usec + rubuf.ru_stime.tv_usec) / 1e6;
120			t += rubuf.ru_utime.tv_sec + rubuf.ru_stime.tv_sec;
121			getrusage(RUSAGE_CHILDREN, &rubuf);
122			t += (rubuf.ru_utime.tv_usec + rubuf.ru_stime.tv_usec) / 1e6;
123			t += rubuf.ru_utime.tv_sec + rubuf.ru_stime.tv_sec;
124
125			sprintf(errmsg, "%ld rays, %4.2f%% done after %5.4f CPU hours\n",
126			nrays, pctdone, t/3600.0);
127	greg	1.24	eputs(errmsg);
128			tlastrept = time((long *)0);
129			}
130	greg	1.1	#else
131	greg	1.24	report() /* report progress */
132			{
133			tlastrept = time((long *)0);
134			sprintf(errmsg, "%ld rays, %4.2f%% done after %5.4f hours\n",
135			nrays, pctdone, (tlastrept-tstart)/3600.0);
136	greg	1.1	eputs(errmsg);
137	greg	2.4	signal(SIGALRM, report);
138	greg	1.1	}
139	greg	1.24	#endif
140	greg	1.1
141
142	greg	2.8	openheader() /* save standard output to header file */
143			{
144			hfname = mktemp(HFTEMPLATE);
145			if (freopen(hfname, "w", stdout) == NULL) {
146			sprintf(errmsg, "cannot open header file \"%s\"", hfname);
147			error(SYSTEM, errmsg);
148			}
149			}
150
151
152			dupheader() /* repeat header on standard output */
153			{
154			register int c;
155
156	greg	2.18	if (hfp == NULL) {
157			if ((hfp = fopen(hfname, "r")) == NULL)
158			error(SYSTEM, "error reopening header file");
159			#ifdef MSDOS
160			setmode(fileno(hfp), O_BINARY);
161			#endif
162			} else if (fseek(hfp, 0L, 0) < 0)
163	greg	2.8	error(SYSTEM, "seek error on header file");
164			while ((c = getc(hfp)) != EOF)
165			putchar(c);
166			}
167
168
169			rpict(seq, pout, zout, prvr) /* generate image(s) */
170			int seq;
171			char pout, zout, *prvr;
172			/*
173			* If seq is greater than zero, then we will render a sequence of
174			* images based on view parameter strings read from the standard input.
175			* If pout is NULL, then all images will be sent to the standard ouput.
176			* If seq is greater than zero and prvr is an integer, then it is the
177			* frame number at which rendering should begin. Preceeding view parameter
178			* strings will be skipped in the input.
179			* If pout and prvr are the same, prvr is renamed to avoid overwriting.
180			* Note that pout and zout should contain %d format specifications for
181			* sequenced file naming.
182			*/
183			{
184			extern char rindex(), strncpy(), *strcat();
185	greg	2.9	char fbuf[128], fbuf2[128];
186			register char *cp;
187	greg	2.14	RESOLU rs;
188			double pa;
189	greg	2.8	/* check sampling */
190			if (psample < 1)
191			psample = 1;
192			else if (psample > MAXDIV) {
193			sprintf(errmsg, "pixel sampling reduced from %d to %d",
194			psample, MAXDIV);
195			error(WARNING, errmsg);
196			psample = MAXDIV;
197			}
198			/* get starting frame */
199			if (seq <= 0)
200			seq = 0;
201			else if (prvr != NULL && isint(prvr)) {
202	greg	2.9	register int rn; /* skip to specified view */
203	greg	2.8	if ((rn = atoi(prvr)) < seq)
204			error(USER, "recover frame less than start frame");
205			if (pout == NULL)
206			error(USER, "missing output file specification");
207			for ( ; seq < rn; seq++)
208			if (nextview(stdin) == EOF)
209			error(USER, "unexpected EOF on view input");
210			prvr = fbuf; /* mark for renaming */
211			}
212	greg	2.18	if (pout != NULL & prvr != NULL) {
213	greg	2.8	sprintf(fbuf, pout, seq);
214	greg	2.18	if (!strcmp(prvr, fbuf)) { /* rename */
215			strcpy(fbuf2, fbuf);
216			for (cp = fbuf2; *cp; cp++)
217			;
218			while (cp > fbuf2 && !ISDIRSEP(cp[-1]))
219			cp--;
220			strcpy(cp, RFTEMPLATE);
221	greg	2.8	prvr = mktemp(fbuf2);
222			if (rename(fbuf, prvr) < 0 && errno != ENOENT) {
223			sprintf(errmsg,
224			"cannot rename \"%s\" to \"%s\"",
225			fbuf, prvr);
226			error(SYSTEM, errmsg);
227			}
228			}
229			}
230			/* render sequence */
231			do {
232			if (seq && nextview(stdin) == EOF)
233			break;
234			if (pout != NULL) {
235			sprintf(fbuf, pout, seq);
236			if (freopen(fbuf, "w", stdout) == NULL) {
237			sprintf(errmsg,
238			"cannot open output file \"%s\"", fbuf);
239			error(SYSTEM, errmsg);
240			}
241	greg	2.17	#ifdef MSDOS
242			setmode(fileno(stdout), O_BINARY);
243			#endif
244	greg	2.8	dupheader();
245			}
246			hres = hresolu; vres = vresolu; pa = pixaspect;
247			if (prvr != NULL)
248			if (viewfile(prvr, &ourview, &rs) <= 0
249			\|\| rs.or != PIXSTANDARD) {
250			sprintf(errmsg,
251			"cannot recover view parameters from \"%s\"", prvr);
252			error(WARNING, errmsg);
253			} else {
254			pa = 0.0;
255			hres = scanlen(&rs);
256			vres = numscans(&rs);
257			}
258	greg	2.9	if ((cp = setview(&ourview)) != NULL)
259			error(USER, cp);
260	greg	2.8	normaspect(viewaspect(&ourview), &pa, &hres, &vres);
261			if (seq) {
262			if (ralrm > 0) {
263	greg	2.11	fprintf(stderr, "FRAME %d:", seq);
264			fprintview(&ourview, stderr);
265			putc('\n', stderr);
266			fflush(stderr);
267	greg	2.8	}
268			printf("FRAME=%d\n", seq);
269			}
270			fputs(VIEWSTR, stdout);
271			fprintview(&ourview, stdout);
272			putchar('\n');
273			if (pa < .99 \|\| pa > 1.01)
274			fputaspect(pa, stdout);
275			fputformat(COLRFMT, stdout);
276			putchar('\n');
277			if (zout != NULL)
278	greg	2.9	sprintf(cp=fbuf, zout, seq);
279	greg	2.8	else
280	greg	2.9	cp = NULL;
281			render(cp, prvr);
282	greg	2.8	prvr = NULL;
283			} while (seq++);
284			}
285
286
287			nextview(fp) /* get next view from fp */
288			FILE *fp;
289			{
290	greg	2.9	char linebuf[256];
291	greg	2.8
292			while (fgets(linebuf, sizeof(linebuf), fp) != NULL)
293	greg	2.9	if (isview(linebuf) && sscanview(&ourview, linebuf) > 0)
294	greg	2.8	return(0);
295			return(EOF);
296			}
297
298
299	greg	1.11	render(zfile, oldfile) /* render the scene */
300			char zfile, oldfile;
301	greg	1.1	{
302	greg	1.16	extern long lseek();
303	greg	1.1	COLOR scanbar[MAXDIV+1]; / scanline arrays of pixel values */
304	greg	1.11	float zbar[MAXDIV+1]; / z values */
305	greg	2.2	char sampdens; / previous sample density */
306	greg	1.1	int ypos; /* current scanline */
307	greg	1.15	int ystep; /* current y step size */
308	greg	1.33	int hstep; /* h step size */
309	greg	1.16	int zfd;
310	greg	1.1	COLOR *colptr;
311	greg	1.11	float *zptr;
312	greg	1.1	register int i;
313	greg	1.9	/* allocate scanlines */
314	greg	1.1	for (i = 0; i <= psample; i++) {
315	greg	2.8	scanbar[i] = (COLOR )malloc(hressizeof(COLOR));
316	greg	1.1	if (scanbar[i] == NULL)
317	greg	1.11	goto memerr;
318	greg	1.1	}
319	greg	2.2	hstep = (psample140+49)/99; / quincunx sampling */
320			ystep = (psample*99+70)/140;
321			if (hstep > 2) {
322	greg	2.8	i = hres/hstep + 2;
323	greg	2.2	if ((sampdens = malloc(i)) == NULL)
324			goto memerr;
325			while (i--)
326			sampdens[i] = hstep;
327			} else
328			sampdens = NULL;
329	greg	1.11	/* open z file */
330			if (zfile != NULL) {
331	greg	1.16	if ((zfd = open(zfile, O_WRONLY\|O_CREAT, 0666)) == -1) {
332	greg	1.11	sprintf(errmsg, "cannot open z file \"%s\"", zfile);
333			error(SYSTEM, errmsg);
334			}
335	greg	2.17	#ifdef MSDOS
336			setmode(zfd, O_BINARY);
337			#endif
338	greg	1.11	for (i = 0; i <= psample; i++) {
339	greg	2.8	zbar[i] = (float )malloc(hressizeof(float));
340	greg	1.11	if (zbar[i] == NULL)
341			goto memerr;
342			}
343			} else {
344	greg	1.16	zfd = -1;
345	greg	1.11	for (i = 0; i <= psample; i++)
346			zbar[i] = NULL;
347			}
348	greg	1.1	/* write out boundaries */
349	greg	2.8	fprtresolu(hres, vres, stdout);
350	greg	1.10	/* recover file and compute first */
351	greg	1.11	i = salvage(oldfile);
352	greg	1.23	if (zfd != -1 && i > 0 &&
353	greg	2.8	lseek(zfd, (long)ihressizeof(float), 0) == -1)
354	greg	1.11	error(SYSTEM, "z file seek error in render");
355	greg	2.8	pctdone = 100.0*i/vres;
356	greg	1.24	if (ralrm > 0) /* report init stats */
357			report();
358	greg	2.14	#ifndef BSD
359	greg	1.32	else
360			#endif
361			signal(SIGALRM, report);
362	greg	2.8	ypos = vres-1 - i;
363			fillscanline(scanbar[0], zbar[0], sampdens, hres, ypos, hstep);
364	greg	1.10	/* compute scanlines */
365	greg	1.15	for (ypos -= ystep; ypos > -ystep; ypos -= ystep) {
366			/* bottom adjust? */
367			if (ypos < 0) {
368			ystep += ypos;
369			ypos = 0;
370			}
371			colptr = scanbar[ystep]; /* move base to top */
372			scanbar[ystep] = scanbar[0];
373	greg	1.1	scanbar[0] = colptr;
374	greg	1.15	zptr = zbar[ystep];
375			zbar[ystep] = zbar[0];
376	greg	1.11	zbar[0] = zptr;
377	greg	1.10	/* fill base line */
378	greg	2.2	fillscanline(scanbar[0], zbar[0], sampdens,
379	greg	2.8	hres, ypos, hstep);
380	greg	1.10	/* fill bar */
381	greg	2.8	fillscanbar(scanbar, zbar, hres, ypos, ystep);
382	greg	1.10	/* write it out */
383	greg	2.14	#ifndef BSD
384	greg	1.32	signal(SIGALRM, SIG_IGN); /* don't interrupt writes */
385			#endif
386	greg	1.15	for (i = ystep; i > 0; i--) {
387	greg	1.17	if (zfd != -1 && write(zfd, (char *)zbar[i],
388	greg	2.8	hres*sizeof(float))
389			< hres*sizeof(float))
390	greg	1.1	goto writerr;
391	greg	2.8	if (fwritescan(scanbar[i], hres, stdout) < 0)
392	greg	1.11	goto writerr;
393			}
394	greg	1.1	if (fflush(stdout) == EOF)
395			goto writerr;
396	greg	1.24	/* record progress */
397	greg	2.8	pctdone = 100.0*(vres-1-ypos)/vres;
398	greg	1.24	if (ralrm > 0 && time((long *)0) >= tlastrept+ralrm)
399			report();
400	greg	2.14	#ifndef BSD
401	greg	1.32	else
402			signal(SIGALRM, report);
403			#endif
404	greg	1.1	}
405	greg	1.11	/* clean up */
406	greg	2.7	signal(SIGALRM, SIG_IGN);
407	greg	1.16	if (zfd != -1) {
408	greg	2.8	if (write(zfd, (char )zbar[0], hressizeof(float))
409			< hres*sizeof(float))
410	greg	1.11	goto writerr;
411	greg	1.20	if (close(zfd) == -1)
412			goto writerr;
413	greg	1.11	for (i = 0; i <= psample; i++)
414			free((char *)zbar[i]);
415			}
416	greg	2.8	fwritescan(scanbar[0], hres, stdout);
417	greg	1.10	if (fflush(stdout) == EOF)
418			goto writerr;
419	greg	1.1	for (i = 0; i <= psample; i++)
420			free((char *)scanbar[i]);
421	greg	2.2	if (sampdens != NULL)
422			free(sampdens);
423	greg	1.11	pctdone = 100.0;
424	greg	2.13	if (ralrm > 0)
425			report();
426	greg	1.1	return;
427			writerr:
428			error(SYSTEM, "write error in render");
429	greg	1.11	memerr:
430			error(SYSTEM, "out of memory in render");
431	greg	1.1	}
432
433
434	greg	2.2	fillscanline(scanline, zline, sd, xres, y, xstep) /* fill scan at y */
435	greg	2.14	register COLOR *scanline;
436			register float *zline;
437	greg	2.2	register char *sd;
438	greg	1.9	int xres, y, xstep;
439	greg	1.1	{
440	greg	1.33	static int nc = 0; /* number of calls */
441	greg	2.2	int bl = xstep, b = xstep;
442	greg	2.14	double z;
443	greg	1.1	register int i;
444
445	greg	1.11	z = pixvalue(scanline[0], 0, y);
446			if (zline) zline[0] = z;
447	greg	1.33	/* zig-zag start for quincunx pattern */
448	greg	2.2	for (i = ++nc & 1 ? xstep : xstep/2; i < xres-1+xstep; i += xstep) {
449	greg	1.15	if (i >= xres) {
450			xstep += xres-1-i;
451			i = xres-1;
452			}
453	greg	1.11	z = pixvalue(scanline[i], i, y);
454			if (zline) zline[i] = z;
455	greg	2.2	if (sd) b = sd[0] > sd[1] ? sd[0] : sd[1];
456	greg	2.3	if (i <= xstep)
457			b = fillsample(scanline, zline, 0, y, i, 0, b/2);
458			else
459			b = fillsample(scanline+i-xstep,
460			zline ? zline+i-xstep : NULL,
461			i-xstep, y, xstep, 0, b/2);
462	greg	2.2	if (sd) *sd++ = nc & 1 ? bl : b;
463			bl = b;
464	greg	1.1	}
465	greg	2.2	if (sd && nc & 1) *sd = bl;
466	greg	1.1	}
467
468
469	greg	1.11	fillscanbar(scanbar, zbar, xres, y, ysize) /* fill interior */
470	greg	2.14	register COLOR *scanbar[];
471			register float *zbar[];
472	greg	1.9	int xres, y, ysize;
473	greg	1.1	{
474			COLOR vline[MAXDIV+1];
475	greg	1.11	float zline[MAXDIV+1];
476	greg	1.1	int b = ysize;
477			register int i, j;
478
479	greg	1.8	for (i = 0; i < xres; i++) {
480	greg	1.1
481			copycolor(vline[0], scanbar[0][i]);
482			copycolor(vline[ysize], scanbar[ysize][i]);
483	greg	1.11	if (zbar[0]) {
484			zline[0] = zbar[0][i];
485			zline[ysize] = zbar[ysize][i];
486			}
487	greg	1.1
488	greg	1.11	b = fillsample(vline, zbar[0] ? zline : NULL,
489			i, y, 0, ysize, b/2);
490	greg	1.1
491			for (j = 1; j < ysize; j++)
492			copycolor(scanbar[j][i], vline[j]);
493	greg	1.11	if (zbar[0])
494			for (j = 1; j < ysize; j++)
495			zbar[j][i] = zline[j];
496	greg	1.1	}
497			}
498
499
500			int
501	greg	2.14	fillsample(colline, zline, x, y, xlen, ylen, b) /* fill interior points */
502			register COLOR *colline;
503			register float *zline;
504	greg	1.1	int x, y;
505			int xlen, ylen;
506			int b;
507			{
508	greg	2.14	double ratio;
509			double z;
510	greg	1.1	COLOR ctmp;
511			int ncut;
512			register int len;
513
514			if (xlen > 0) /* x or y length is zero */
515			len = xlen;
516			else
517			len = ylen;
518
519			if (len <= 1) /* limit recursion */
520			return(0);
521
522	greg	1.11	if (b > 0
523			\|\| (zline && 2.fabs(zline[0]-zline[len]) > maxdiff(zline[0]+zline[len]))
524			\|\| bigdiff(colline[0], colline[len], maxdiff)) {
525	greg	1.1
526	greg	1.11	z = pixvalue(colline[len>>1], x + (xlen>>1), y + (ylen>>1));
527			if (zline) zline[len>>1] = z;
528	greg	1.1	ncut = 1;
529
530			} else { /* interpolate */
531
532			copycolor(colline[len>>1], colline[len]);
533			ratio = (double)(len>>1) / len;
534			scalecolor(colline[len>>1], ratio);
535	greg	1.11	if (zline) zline[len>>1] = zline[len] * ratio;
536			ratio = 1.0 - ratio;
537	greg	1.1	copycolor(ctmp, colline[0]);
538			scalecolor(ctmp, ratio);
539			addcolor(colline[len>>1], ctmp);
540	greg	1.11	if (zline) zline[len>>1] += zline[0] * ratio;
541	greg	1.1	ncut = 0;
542			}
543			/* recurse */
544	greg	1.11	ncut += fillsample(colline, zline, x, y, xlen>>1, ylen>>1, (b-1)/2);
545	greg	1.1
546	greg	1.11	ncut += fillsample(colline+(len>>1), zline ? zline+(len>>1) : NULL,
547			x+(xlen>>1), y+(ylen>>1),
548			xlen-(xlen>>1), ylen-(ylen>>1), b/2);
549	greg	1.1
550			return(ncut);
551			}
552
553
554	greg	1.11	double
555	greg	1.1	pixvalue(col, x, y) /* compute pixel value */
556			COLOR col; /* returned color */
557			int x, y; /* pixel position */
558			{
559	greg	1.25	static RAY thisray;
560	greg	1.1
561	greg	1.22	if (viewray(thisray.rorg, thisray.rdir, &ourview,
562	greg	2.8	(x+pixjitter())/hres, (y+pixjitter())/vres) < 0) {
563	greg	1.22	setcolor(col, 0.0, 0.0, 0.0);
564			return(0.0);
565			}
566	greg	1.1
567			rayorigin(&thisray, NULL, PRIMARY, 1.0);
568	greg	1.25
569	greg	2.8	samplendx = pixnumber(x,y,hres,vres); /* set pixel index */
570	greg	1.25
571	greg	1.1	rayvalue(&thisray); /* trace ray */
572
573			copycolor(col, thisray.rcol); /* return color */
574	greg	1.11
575	greg	1.20	return(thisray.rt); /* return distance */
576	greg	1.1	}
577
578
579			int
580			salvage(oldfile) /* salvage scanlines from killed program */
581			char *oldfile;
582			{
583			COLR *scanline;
584			FILE *fp;
585			int x, y;
586
587			if (oldfile == NULL)
588			return(0);
589	greg	1.9
590			if ((fp = fopen(oldfile, "r")) == NULL) {
591	greg	1.1	sprintf(errmsg, "cannot open recover file \"%s\"", oldfile);
592			error(WARNING, errmsg);
593			return(0);
594			}
595	greg	2.17	#ifdef MSDOS
596			setmode(fileno(fp), O_BINARY);
597			#endif
598	greg	1.1	/* discard header */
599	greg	2.19	getheader(fp, NULL, NULL);
600	greg	1.1	/* get picture size */
601	greg	1.36	if (!fscnresolu(&x, &y, fp)) {
602	greg	1.2	sprintf(errmsg, "bad recover file \"%s\"", oldfile);
603			error(WARNING, errmsg);
604	greg	1.1	fclose(fp);
605			return(0);
606			}
607
608	greg	2.8	if (x != hres \|\| y != vres) {
609	greg	1.1	sprintf(errmsg, "resolution mismatch in recover file \"%s\"",
610			oldfile);
611			error(USER, errmsg);
612			}
613
614	greg	2.8	scanline = (COLR )malloc(hressizeof(COLR));
615	greg	1.1	if (scanline == NULL)
616			error(SYSTEM, "out of memory in salvage");
617	greg	2.8	for (y = 0; y < vres; y++) {
618			if (freadcolrs(scanline, hres, fp) < 0)
619	greg	1.1	break;
620	greg	2.8	if (fwritecolrs(scanline, hres, stdout) < 0)
621	greg	1.1	goto writerr;
622			}
623			if (fflush(stdout) == EOF)
624			goto writerr;
625			free((char *)scanline);
626			fclose(fp);
627			unlink(oldfile);
628			return(y);
629			writerr:
630	greg	2.9	sprintf(errmsg, "write error during recovery of \"%s\"", oldfile);
631			error(SYSTEM, errmsg);
632	greg	1.31	}
633
634
635			int
636			pixnumber(x, y, xres, yres) /* compute pixel index (brushed) */
637			register int x, y;
638			int xres, yres;
639			{
640			x -= y;
641			while (x < 0)
642			x += xres;
643			return((((x>>2)*yres + y) << 2) + (x & 3));
644	greg	1.1	}