/* Copyright (c) 1997 Silicon Graphics, Inc. */

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

/*
 * Copy data into a holodeck file
 */

#include "holo.h"
#include "view.h"
#include "resolu.h"

int	frompicz;		/* input from pictures & depth-buffers? */
int	noutsects;		/* number of output sections */
int	obstructions = -1;	/* interior obstructions allowed? */

char	*progname;		/* global argv[0] */


main(argc, argv)
int	argc;
char	*argv[];
{
	int	i;

	progname = argv[0];
	if (argc < 4)
		goto userr;
	if (!strcmp(argv[2], "-h"))
		frompicz = 0;
	else if (!strcmp(argv[2], "-pz"))
		frompicz = 1;
	else
		goto userr;
	if (frompicz && (argc-3)%2)
		goto userr;
	noutsects = openholo(argv[1], 1);
	if (frompicz)
		for (i = 3; i < argc; i += 2)
			addpicz(argv[i], argv[i+1]);
	else
		for (i = 3; i < argc; i++)
			addholo(argv[i]);
	quit(0);
userr:
	fprintf(stderr, "Usage: %s output.hdk -h inp1.hdk ..\n", progname);
	fprintf(stderr, "   Or: %s output.hdk -pz inp1.pic inp1.zbf ..\n",
			progname);
	exit(1);
}


holheadline(s, bf)		/* check holodeck header line */
register char	*s;
int	*bf;
{
	char	fmt[32];

	if (formatval(fmt, s)) {
		*bf = strcmp(fmt, HOLOFMT);
		return;
	}
	if (!strncmp(s, "OBSTRUCTIONS=", 13)) {
		s += 13;
		while (*s == ' ') s++;
		if (*s == 't' | *s == 'T')
			obstructions = 1;
		else if (*s == 'f' | *s == 'F')
			obstructions = 0;
		else
			error(WARNING, "bad OBSTRUCTIONS value in holodeck");
		return;
	}
}


int
openholo(fname, append)		/* open existing holodeck file for i/o */
char	*fname;
int	append;
{
	extern long	ftell();
	FILE	*fp;
	int	fd;
	int	badfmt = 0;
	int4	nextloc;
	int	n;
					/* open holodeck file */
	if ((fp = fopen(fname, append ? "r+" : "r")) == NULL) {
		sprintf(errmsg, "cannot open \"%s\" for %s", fname,
				append ? "appending" : "reading");
		error(SYSTEM, errmsg);
	}
					/* check header and magic number */
	if (append)
		badfmt |= getheader(fp, holheadline, &badfmt) < 0;
	else
		badfmt = checkheader(fp, HOLOFMT, NULL) < 0;
	if (badfmt || getw(fp) != HOLOMAGIC) {
		sprintf(errmsg, "file \"%s\" not in holodeck format", fname);
		error(USER, errmsg);
	}
	fd = dup(fileno(fp));			/* dup file handle */
	nextloc = ftell(fp);			/* get stdio position */
	fclose(fp);				/* done with stdio */
	for (n = 0; nextloc > 0L; n++) {	/* initialize each section */
		lseek(fd, (long)nextloc, 0);
		read(fd, (char *)&nextloc, sizeof(nextloc));
		hdinit(fd, NULL);
	}
	return(n);
}


addray(ro, rd, d, cv)		/* add a ray to our output holodeck */
FVECT	ro, rd;
double	d;
COLR	cv;
{
	int	sn;
	register HOLO	*hp;
	GCOORD	gc[2];
	BYTE	rr[2][2];
	double	d0, d1;
	register RAYVAL	*rv;
				/* check each output section */
	for (sn = noutsects; sn--; ) {
		hp = hdlist[sn];
		d0 = hdinter(gc, rr, &d1, hp, ro, rd);
		if (d <= d0 || d1 < -0.001)
			continue;	/* missed section */
		if (obstructions > 0 && d0 < -0.001)
			continue;	/* ray starts too late */
		if (!obstructions && d < 0.999*d1)
			continue;	/* ray ends too soon */
					/* should we check for duplicates? */
		rv = hdnewrays(hp, hdbindex(hp, gc), 1);
		rv->r[0][0] = rr[0][0]; rv->r[0][1] = rr[0][1];
		rv->r[1][0] = rr[1][0]; rv->r[1][1] = rr[1][1];
		copycolr(rv->v, cv);
		rv->d = hdcode(hp, d-d0);
	}
}


addholo(hdf)			/* add a holodeck file */
char	*hdf;
{
	int	fd;
	register HOLO	*hp;
	register BEAM	*bp;
	GCOORD	gc[2];
	FVECT	ro, rd;
	double	d;
	int	i, j;
	register int	k;

	openholo(hdf, 0);		/* open the holodeck for reading */
	fd = hdlist[noutsects]->fd;	/* remember the file handle */
	while ((hp = hdlist[noutsects]) != NULL) {	/* load each section */
		for (j = nbeams(hp); j > 0; j--)	/* load each beam */
			if ((bp = hdgetbeam(hp, j)) != NULL) {
				hdbcoord(gc, hp, j);
				for (k = bp->nrm; k--; ) {
					hdray(ro, rd, hp, gc, hdbray(bp)[k].r);
					d = hddepth(hp, hdbray(bp)[k].d);
					addray(ro, rd, d, hdbray(bp)[k].v);
				}
				hdfreebeam(hp, j);	/* free the beam */
			}
		hddone(hp);				/* free the section */
	}
	close(fd);			/* close the file */
}


struct phead {
	VIEW	vw;
	double	expos;
	short	gotview;
	short	badfmt;
	short	altprims;
};


picheadline(s, ph)		/* process picture header line */
char	*s;
struct phead	*ph;
{
	char	fmt[32];

	if (formatval(fmt, s)) {
		ph->badfmt = strcmp(fmt, COLRFMT);
		return;
	}
	if (isprims(s)) {
		ph->altprims++;		/* don't want to deal with this */
		return;
	}
	if (isexpos(s)) {
		ph->expos *= exposval(s);
		return;
	}
	if (isview(s)) {
		ph->gotview += sscanview(&ph->vw, s);
		return;
	}
}


addpicz(pcf, zbf)		/* add a picture + depth-buffer */
char	*pcf, *zbf;
{
	FILE	*pfp;
	int	zfd;
	COLR	*cscn;
	float	*zscn;
	struct phead	phd;
	int	eshft;
	double	emult;
	RESOLU	prs;
	FLOAT	vl[2];
	FVECT	ro, rd;
	double	aftd;
	COLOR	ctmp;
	int	j;
	register int	i;
				/* open files */
	if ((pfp = fopen(pcf, "r")) == NULL) {
		sprintf(errmsg, "cannot open picture file \"%s\"", pcf);
		error(SYSTEM, pcf);
	}
	if ((zfd = open(zbf, O_RDONLY)) < 0) {
		sprintf(errmsg, "cannot open depth file \"%s\"", zbf);
		error(SYSTEM, pcf);
	}
				/* load picture header */
	copystruct(&phd.vw, &stdview);
	phd.expos = 1.0;
	phd.badfmt = phd.gotview = phd.altprims = 0;
	if (getheader(pfp, picheadline, &phd) < 0 ||
			phd.badfmt || !fgetsresolu(&prs, pfp)) {
		sprintf(errmsg, "bad format for picture file \"%s\"", pcf);
		error(USER, errmsg);
	}
	if (!phd.gotview || setview(&phd.vw) != NULL) {
		sprintf(errmsg, "missing/illegal view in picture \"%s\"",
				pcf);
		error(USER, errmsg);
	}
	if (phd.altprims) {
		sprintf(errmsg, "ignoring primary values in picture \"%s\"",
				pcf);
		error(WARNING, errmsg);
	}
				/* figure out what to do about exposure */
	if (phd.expos < 0.99 | phd.expos > 1.01) {
		emult = -log(phd.expos)/log(2.);
		eshft = emult >= 0. ? emult+.5 : emult-.5;
		emult -= (double)eshft;
		if (emult <= 0.01 & emult >= -0.01)
			emult = -1.;
		else {
			emult = 1./phd.expos;
			eshft = 0;
		}
	} else {
		emult = -1.;
		eshft = 0;
	}
				/* allocate buffers */
	cscn = (COLR *)malloc(scanlen(&prs)*sizeof(COLR));
	zscn = (float *)malloc(scanlen(&prs)*sizeof(float));
	if (cscn == NULL | zscn == NULL)
		error(SYSTEM, "out of memory in addpicz");
				/* read and process each scanline */
	for (j = 0; j < numscans(&prs); j++) {
		i = scanlen(&prs);			/* read colrs */
		if (freadcolrs(cscn, i, pfp) < 0) {
			sprintf(errmsg, "error reading picture \"%s\"", pcf);
			error(USER, errmsg);
		}
		if (eshft)				/* shift exposure */
			shiftcolrs(cscn, i, eshft);
		i *= sizeof(float);			/* read depth */
		if (read(zfd, (char *)zscn, i) != i) {
			sprintf(errmsg, "error reading depth file \"%s\"", zbf);
			error(USER, errmsg);
		}
		for (i = scanlen(&prs); i--; ) {	/* do each pixel */
			pix2loc(vl, &prs, i, j);
			aftd = viewray(ro, rd, &phd.vw, vl[0], vl[1]);
			if (aftd < -FTINY)
				continue;		/* off view */
			if (aftd > FTINY && zscn[i] > aftd)
				continue;		/* aft clipped */
			if (emult > 0.) {		/* whatta pain */
				colr_color(ctmp, cscn[i]);
				scalecolor(ctmp, emult);
				setcolr(cscn[i], colval(ctmp,RED),
					colval(ctmp,GRN), colval(ctmp,BLU));
			}
			addray(ro, rd, (double)zscn[i], cscn[i]);
		}
	}
				/* clean up */
	free((char *)cscn);
	free((char *)zscn);
	fclose(pfp);
	close(zfd);
}


eputs(s)			/* put error message to stderr */
register char  *s;
{
	static int  midline = 0;

	if (!*s)
		return;
	if (!midline++) {	/* prepend line with program name */
		fputs(progname, stderr);
		fputs(": ", stderr);
	}
	fputs(s, stderr);
	if (s[strlen(s)-1] == '\n') {
		fflush(stderr);
		midline = 0;
	}
}


quit(code)			/* exit the program gracefully */
int	code;
{
	hdsync(NULL, 1);	/* write out any buffered data */
	exit(code);
}