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root/radiance/ray/src/px/pinterp.c

Comparing ray/src/px/pinterp.c (file contents):
Revision 1.19 by greg, Tue Jan 16 11:29:14 1990 UTC vs.
Revision 2.41 by schorsch, Sun Mar 28 20:33:14 2004 UTC

#	Line 1 | Line 1
1		#ifndef lint
2	<	static char SCCSid[] = "$SunId$ LBL";
2	>	static const char       RCSid[] = "$Id$";
3		#endif
4	–
4		/*
5		* Interpolate and extrapolate pictures with different view parameters.
6		*
7		*      Greg Ward       09Dec89
8		*/
9
10	<	#include "standard.h"
10	>	#include "copyright.h"
11
12	<	#include <sys/fcntl.h>
12	>	#include <ctype.h>
13	>	#include <string.h>
14
15	+	#include "platform.h"
16	+	#include "standard.h"
17	+	#include "rtprocess.h" /* Windows: must come before color.h */
18		#include "view.h"
16	–
19		#include "color.h"
20
21	+	#define LOG2            0.69314718055994530942
22	+
23		#define pscan(y)        (ourpict+(y)*hresolu)
24	+	#define sscan(y)        (ourspict+(y)*hresolu)
25	+	#define wscan(y)        (ourweigh+(y)*hresolu)
26		#define zscan(y)        (ourzbuf+(y)*hresolu)
27	+	#define bscan(y)        (ourbpict+(y)*hresolu)
28	+	#define averaging       (ourweigh != NULL)
29	+	#define blurring        (ourbpict != NULL)
30	+	#define usematrix       (hasmatrix & !averaging)
31	+	#define zisnorm         ((!usematrix) | (ourview.type != VT_PER))
32
33	+	#define MAXWT           1000.           /* maximum pixel weight (averaging) */
34	+
35		#define F_FORE          1               /* fill foreground */
36		#define F_BACK          2               /* fill background */
37
38	<	#define PACKSIZ         42              /* calculation packet size */
38	>	#define PACKSIZ         256             /* max. calculation packet size */
39
40	<	#define RTCOM           "rtrace -h -ovl -fff -x %d %s"
40	>	#define RTCOM           "rtrace -h- -ovl -fff -ld- -i- -I- "
41
42		#define ABS(x)          ((x)>0?(x):-(x))
43
44		struct position {int x,y; float z;};
45
46	+	#define NSTEPS          64              /* number steps in overlap prescan */
47	+	#define MINSTEP         4               /* minimum worthwhile preview step */
48	+
49	+	struct bound {int min,max;};
50	+
51		VIEW    ourview = STDVIEW;              /* desired view */
52		int     hresolu = 512;                  /* horizontal resolution */
53		int     vresolu = 512;                  /* vertical resolution */
#	Line 37 | Line 55 | double pixaspect = 1.0;                /* pixel aspect ratio */
55
56		double  zeps = .02;                     /* allowed z epsilon */
57
58	<	COLR    *ourpict;                       /* output picture */
58	>	COLR    *ourpict;                       /* output picture (COLR's) */
59	>	COLOR   *ourspict;                      /* output pixel sums (averaging) */
60	>	float   *ourweigh = NULL;               /* output pixel weights (averaging) */
61		float   *ourzbuf;                       /* corresponding z-buffer */
62	+	COLOR   *ourbpict = NULL;               /* blurred picture (view averaging) */
63
64	+	VIEW    avgview;                        /* average view for -B option */
65	+	int     nvavg;                          /* number of views averaged */
66	+
67		char    *progname;
68
69	<	int     fill = F_FORE|F_BACK;           /* selected fill algorithm */
70	<	extern int      backfill(), rcalfill(); /* fill functions */
47	<	int     (*deffill)() = backfill;        /* selected fill function */
69	>	int     fillo = F_FORE|F_BACK;          /* selected fill options */
70	>	int     fillsamp = 0;                   /* sample separation (0 == inf) */
71		COLR    backcolr = BLKCOLR;             /* background color */
72	+	COLOR   backcolor = BLKCOLOR;           /* background color (float) */
73		double  backz = 0.0;                    /* background z value */
74	<	int     normdist = 1;                   /* normalized distance? */
75	<	double  ourexp = -1;                    /* output picture exposure */
74	>	int     normdist = 1;                   /* i/o normalized distance? */
75	>	char    ourfmt[LPICFMT+1] = PICFMT;     /* original picture format */
76	>	double  ourexp = -1;                    /* original picture exposure */
77	>	int     expadj = 0;                     /* exposure adjustment (f-stops) */
78	>	double  rexpadj = 1;                    /* real exposure adjustment */
79
80	<	VIEW    theirview = STDVIEW;            /* input view */
80	>	VIEW    theirview;                      /* input view */
81		int     gotview;                        /* got input view? */
82	<	int     thresolu, tvresolu;             /* input resolution */
82	>	int     wrongformat = 0;                /* input in another format? */
83	>	RESOLU  tresolu;                        /* input resolution */
84		double  theirexp;                       /* input picture exposure */
85	<	double  theirs2ours[4][4];              /* transformation matrix */
85	>	MAT4    theirs2ours;                    /* transformation matrix */
86	>	int     hasmatrix = 0;                  /* has transformation matrix */
87
88	<	int     childpid = -1;                  /* id of fill process */
89	<	FILE    *psend, *precv;                 /* pipes to/from fill calculation */
90	<	int     queue[PACKSIZ][2];              /* pending pixels */
91	<	int     queuesiz;                       /* number of pixels pending */
88	>	static SUBPROC PDesc = SP_INACTIVE; /* rtrace process descriptor */
89	>	unsigned short  queue[PACKSIZ][2];      /* pending pixels */
90	>	int     packsiz;                        /* actual packet size */
91	>	int     queuesiz = 0;                   /* number of pixels pending */
92
93	+	typedef void fillfunc_t(int x, int y);
94
95	<	main(argc, argv)                        /* interpolate pictures */
96	<	int     argc;
97	<	char    *argv[];
95	>	static gethfunc headline;
96	>	static int nextview(FILE *fp);
97	>	static void compavgview(void);
98	>	static void addpicture(char *pfile, char *zspec);
99	>	static int pixform(MAT4 xfmat, VIEW *vw1, VIEW *vw2);
100	>	static void addscanline(struct bound *xl, int y,
101	>	COLR *pline, float *zline, struct position *lasty);
102	>	static void addpixel(struct position *p0, struct position *p1,
103	>	struct position *p2, COLR pix, double w, double z);
104	>	static double movepixel(FVECT pos);
105	>	static int getperim(struct bound *xl, struct bound *yl, float *zline, int zfd);
106	>	static void backpicture(fillfunc_t *fill, int samp);
107	>	static void fillpicture(fillfunc_t *fill);
108	>	static int clipaft(void);
109	>	static int addblur(void);
110	>	static void writepicture(void);
111	>	static void writedistance(char *fname);
112	>	static fillfunc_t backfill;
113	>	static fillfunc_t rcalfill;
114	>	static void calstart(char *prog, char *args);
115	>	static void caldone(void);
116	>	static void clearqueue(void);
117	>	static void syserror(char *s);
118	>
119	>	fillfunc_t *fillfunc = backfill;        /* selected fill function */
120	>
121	>	int
122	>	main(                   /* interpolate pictures */
123	>	int     argc,
124	>	char    *argv[]
125	>	)
126		{
127	<	#define check(olen,narg)        if (argv[i][olen] || narg >= argc-i) goto badopt
128	<	extern double   atof();
127	>	#define  check(ol,al)           if (argv[an][ol] || \
128	>	badarg(argc-an-1,argv+an+1,al)) \
129	>	goto badopt
130		int     gotvfile = 0;
131	+	int     doavg = -1;
132	+	int     doblur = 0;
133		char    *zfile = NULL;
134	<	char    *err;
135	<	int     i, rval;
134	>	char    *expcomp = NULL;
135	>	int     i, an, rval;
136
137		progname = argv[0];
138
139	<	for (i = 1; i < argc && argv[i][0] == '-'; i++) {
140	<	rval = getviewopt(&ourview, argc-i, argv+i);
139	>	for (an = 1; an < argc && argv[an][0] == '-'; an++) {
140	>	rval = getviewopt(&ourview, argc-an, argv+an);
141		if (rval >= 0) {
142	<	i += rval;
142	>	an += rval;
143		continue;
144		}
145	<	switch (argv[i][1]) {
145	>	switch (argv[an][1]) {
146	>	case 'e':                               /* exposure */
147	>	check(2,"f");
148	>	expcomp = argv[++an];
149	>	break;
150		case 't':                               /* threshold */
151	<	check(2,1);
152	<	zeps = atof(argv[++i]);
151	>	check(2,"f");
152	>	zeps = atof(argv[++an]);
153		break;
154	+	case 'a':                               /* average */
155	+	check(2,NULL);
156	+	doavg = 1;
157	+	break;
158	+	case 'B':                               /* blur views */
159	+	check(2,NULL);
160	+	doblur = 1;
161	+	break;
162	+	case 'q':                               /* quick (no avg.) */
163	+	check(2,NULL);
164	+	doavg = 0;
165	+	break;
166		case 'n':                               /* dist. normalized? */
167	<	check(2,0);
167	>	check(2,NULL);
168		normdist = !normdist;
169		break;
170		case 'f':                               /* fill type */
171	<	switch (argv[i][2]) {
171	>	switch (argv[an][2]) {
172		case '0':                               /* none */
173	<	check(3,0);
174	<	fill = 0;
173	>	check(3,NULL);
174	>	fillo = 0;
175		break;
176		case 'f':                               /* foreground */
177	<	check(3,0);
178	<	fill = F_FORE;
177	>	check(3,NULL);
178	>	fillo = F_FORE;
179		break;
180		case 'b':                               /* background */
181	<	check(3,0);
182	<	fill = F_BACK;
181	>	check(3,NULL);
182	>	fillo = F_BACK;
183		break;
184		case 'a':                               /* all */
185	<	check(3,0);
186	<	fill = F_FORE|F_BACK;
185	>	check(3,NULL);
186	>	fillo = F_FORE|F_BACK;
187		break;
188	+	case 's':                               /* sample */
189	+	check(3,"i");
190	+	fillsamp = atoi(argv[++an]);
191	+	break;
192		case 'c':                               /* color */
193	<	check(3,3);
194	<	deffill = backfill;
195	<	setcolr(backcolr, atof(argv[i+1]),
196	<	atof(argv[i+2]), atof(argv[i+3]));
197	<	i += 3;
193	>	check(3,"fff");
194	>	fillfunc = backfill;
195	>	setcolor(backcolor, atof(argv[an+1]),
196	>	atof(argv[an+2]), atof(argv[an+3]));
197	>	setcolr(backcolr, colval(backcolor,RED),
198	>	colval(backcolor,GRN),
199	>	colval(backcolor,BLU));
200	>	an += 3;
201		break;
202		case 'z':                               /* z value */
203	<	check(3,1);
204	<	deffill = backfill;
205	<	backz = atof(argv[++i]);
203	>	check(3,"f");
204	>	fillfunc = backfill;
205	>	backz = atof(argv[++an]);
206		break;
207		case 'r':                               /* rtrace */
208	<	check(3,1);
209	<	deffill = rcalfill;
210	<	calstart(RTCOM, argv[++i]);
208	>	check(3,"s");
209	>	fillfunc = rcalfill;
210	>	calstart(RTCOM, argv[++an]);
211		break;
212		default:
213		goto badopt;
214		}
215		break;
216		case 'z':                               /* z file */
217	<	check(2,1);
218	<	zfile = argv[++i];
217	>	check(2,"s");
218	>	zfile = argv[++an];
219		break;
220		case 'x':                               /* x resolution */
221	<	check(2,1);
222	<	hresolu = atoi(argv[++i]);
221	>	check(2,"i");
222	>	hresolu = atoi(argv[++an]);
223		break;
224		case 'y':                               /* y resolution */
225	<	check(2,1);
226	<	vresolu = atoi(argv[++i]);
225	>	check(2,"i");
226	>	vresolu = atoi(argv[++an]);
227		break;
228		case 'p':                               /* pixel aspect */
229	<	check(2,1);
230	<	pixaspect = atof(argv[++i]);
229	>	if (argv[an][2] != 'a')
230	>	goto badopt;
231	>	check(3,"f");
232	>	pixaspect = atof(argv[++an]);
233		break;
234		case 'v':                               /* view file */
235	<	if (argv[i][2] != 'f')
235	>	if (argv[an][2] != 'f')
236		goto badopt;
237	<	check(3,1);
238	<	gotvfile = viewfile(argv[++i], &ourview, 0, 0);
239	<	if (gotvfile < 0) {
240	<	perror(argv[i]);
241	<	exit(1);
156	<	} else if (gotvfile == 0) {
237	>	check(3,"s");
238	>	gotvfile = viewfile(argv[++an], &ourview, NULL);
239	>	if (gotvfile < 0)
240	>	syserror(argv[an]);
241	>	else if (gotvfile == 0) {
242		fprintf(stderr, "%s: bad view file\n",
243	<	argv[i]);
243	>	argv[an]);
244		exit(1);
245		}
246		break;
247		default:
248		badopt:
249		fprintf(stderr, "%s: command line error at '%s'\n",
250	<	progname, argv[i]);
250	>	progname, argv[an]);
251		goto userr;
252		}
253		}
254		/* check arguments */
255	<	if ((argc-i)%2)
255	>	if ((argc-an)%2)
256		goto userr;
257	+	if (fillsamp == 1)
258	+	fillo &= ~F_BACK;
259	+	if (doavg < 0)
260	+	doavg = (argc-an) > 2;
261	+	if (expcomp != NULL) {
262	+	if ((expcomp[0] == '+') | (expcomp[0] == '-')) {
263	+	expadj = atof(expcomp) + (expcomp[0]=='+' ? .5 : -.5);
264	+	if (doavg | doblur)
265	+	rexpadj = pow(2.0, atof(expcomp));
266	+	else
267	+	rexpadj = pow(2.0, (double)expadj);
268	+	} else {
269	+	if (!isflt(expcomp))
270	+	goto userr;
271	+	rexpadj = atof(expcomp);
272	+	expadj = log(rexpadj)/LOG2 + (rexpadj>1 ? .5 : -.5);
273	+	if (!(doavg | doblur))
274	+	rexpadj = pow(2.0, (double)expadj);
275	+	}
276	+	}
277		/* set view */
278	<	if (err = setview(&ourview)) {
279	<	fprintf(stderr, "%s: %s\n", progname, err);
278	>	if (nextview(doblur ? stdin : (FILE *)NULL) == EOF) {
279	>	fprintf(stderr, "%s: no view on standard input!\n",
280	>	progname);
281		exit(1);
282		}
283		normaspect(viewaspect(&ourview), &pixaspect, &hresolu, &vresolu);
284		/* allocate frame */
285	<	ourpict = (COLR *)malloc(hresolu*vresolu*sizeof(COLR));
286	<	ourzbuf = (float *)calloc(hresolu*vresolu,sizeof(float));
287	<	if (ourpict == NULL || ourzbuf == NULL)
288	<	syserror();
289	<	/* get input */
290	<	for ( ; i < argc; i += 2)
291	<	addpicture(argv[i], argv[i+1]);
292	<	/* fill in spaces */
293	<	if (fill&F_BACK)
294	<	backpicture();
295	<	else
296	<	fillpicture();
285	>	if (doavg) {
286	>	ourspict = (COLOR *)bmalloc(hresolu*vresolu*sizeof(COLOR));
287	>	ourweigh = (float *)bmalloc(hresolu*vresolu*sizeof(float));
288	>	if ((ourspict == NULL) | (ourweigh == NULL))
289	>	syserror(progname);
290	>	} else {
291	>	ourpict = (COLR *)bmalloc(hresolu*vresolu*sizeof(COLR));
292	>	if (ourpict == NULL)
293	>	syserror(progname);
294	>	}
295	>	if (doblur) {
296	>	ourbpict = (COLOR *)bmalloc(hresolu*vresolu*sizeof(COLOR));
297	>	if (ourbpict == NULL)
298	>	syserror(progname);
299	>	}
300	>	ourzbuf = (float *)bmalloc(hresolu*vresolu*sizeof(float));
301	>	if (ourzbuf == NULL)
302	>	syserror(progname);
303	>	/* new header */
304	>	newheader("RADIANCE", stdout);
305	>	fputnow(stdout);
306	>	/* run pictures */
307	>	do {
308	>	memset((char *)ourzbuf, '\0', hresolu*vresolu*sizeof(float));
309	>	for (i = an; i < argc; i += 2)
310	>	addpicture(argv[i], argv[i+1]);
311	>	if (fillo&F_BACK)                       /* fill in spaces */
312	>	backpicture(fillfunc, fillsamp);
313	>	else
314	>	fillpicture(fillfunc);
315	>	/* aft clipping */
316	>	clipaft();
317	>	} while (addblur() && nextview(stdin) != EOF);
318		/* close calculation */
319		caldone();
320		/* add to header */
321		printargs(argc, argv, stdout);
322	<	if (gotvfile) {
323	<	printf(VIEWSTR);
324	<	fprintview(&ourview, stdout);
325	<	printf("\n");
322	>	compavgview();
323	>	if (doblur | gotvfile) {
324	>	fputs(VIEWSTR, stdout);
325	>	fprintview(&avgview, stdout);
326	>	putc('\n', stdout);
327		}
328	<	if (pixaspect < .99 || pixaspect > 1.01)
328	>	if ((pixaspect < .99) | (pixaspect > 1.01))
329		fputaspect(pixaspect, stdout);
330	<	if (ourexp > 0 && (ourexp < .995 || ourexp > 1.005))
330	>	if (ourexp > 0)
331	>	ourexp *= rexpadj;
332	>	else
333	>	ourexp = rexpadj;
334	>	if ((ourexp < .995) | (ourexp > 1.005))
335		fputexpos(ourexp, stdout);
336	<	printf("\n");
336	>	if (strcmp(ourfmt, PICFMT))             /* print format if known */
337	>	fputformat(ourfmt, stdout);
338	>	putc('\n', stdout);
339		/* write picture */
340		writepicture();
341		/* write z file */
#	Line 211 | Line 345 | char   *argv[];
345		exit(0);
346		userr:
347		fprintf(stderr,
348	<	"Usage: %s [view opts][-t eps][-z zout][-fT][-n] pfile zspec ..\n",
348	>	"Usage: %s [view opts][-t eps][-z zout][-e spec][-B][-a|-q][-fT][-n] pfile zspec ..\n",
349		progname);
350		exit(1);
351		#undef check
352		}
353
354
355	<	headline(s)                             /* process header string */
356	<	char    *s;
355	>	static int
356	>	headline(                               /* process header string */
357	>	char    *s,
358	>	void    *p
359	>	)
360		{
361	<	static char     *altname[] = {"rview","rpict","pinterp",VIEWSTR,NULL};
225	<	register char   **an;
361	>	char    fmt[32];
362
363	<	printf("\t%s", s);
364	<
363	>	if (isheadid(s))
364	>	return(0);
365	>	if (formatval(fmt, s)) {
366	>	if (globmatch(ourfmt, fmt)) {
367	>	wrongformat = 0;
368	>	strcpy(ourfmt, fmt);
369	>	} else
370	>	wrongformat = 1;
371	>	return(0);
372	>	}
373	>	if (nvavg < 2) {
374	>	putc('\t', stdout);
375	>	fputs(s, stdout);
376	>	}
377		if (isexpos(s)) {
378		theirexp *= exposval(s);
379	+	return(0);
380	+	}
381	+	if (isview(s) && sscanview(&theirview, s) > 0)
382	+	gotview++;
383	+	return(0);
384	+	}
385	+
386	+
387	+	static int
388	+	nextview(                               /* get and set next view */
389	+	FILE    *fp
390	+	)
391	+	{
392	+	char    linebuf[256];
393	+	char    *err;
394	+	register int    i;
395	+
396	+	if (fp != NULL) {
397	+	do                      /* get new view */
398	+	if (fgets(linebuf, sizeof(linebuf), fp) == NULL)
399	+	return(EOF);
400	+	while (!isview(linebuf) || !sscanview(&ourview, linebuf));
401	+	}
402	+	/* set new view */
403	+	if ((err = setview(&ourview)) != NULL) {
404	+	fprintf(stderr, "%s: %s\n", progname, err);
405	+	exit(1);
406	+	}
407	+	if (!nvavg) {                   /* first view */
408	+	avgview = ourview;
409	+	return(nvavg++);
410	+	}
411	+	/* add to average view */
412	+	for (i = 0; i < 3; i++) {
413	+	avgview.vp[i] += ourview.vp[i];
414	+	avgview.vdir[i] += ourview.vdir[i];
415	+	avgview.vup[i] += ourview.vup[i];
416	+	}
417	+	avgview.horiz += ourview.horiz;
418	+	avgview.vert += ourview.vert;
419	+	avgview.hoff += ourview.hoff;
420	+	avgview.voff += ourview.voff;
421	+	avgview.vfore += ourview.vfore;
422	+	avgview.vaft += ourview.vaft;
423	+	return(nvavg++);
424	+	}
425	+
426	+
427	+	static void
428	+	compavgview(void)                               /* compute average view */
429	+	{
430	+	register int    i;
431	+	double  f;
432	+
433	+	if (nvavg < 2)
434		return;
435	+	f = 1.0/nvavg;
436	+	for (i = 0; i < 3; i++) {
437	+	avgview.vp[i] *= f;
438	+	avgview.vdir[i] *= f;
439	+	avgview.vup[i] *= f;
440		}
441	<	for (an = altname; *an != NULL; an++)
442	<	if (!strncmp(*an, s, strlen(*an))) {
443	<	if (sscanview(&theirview, s+strlen(*an)) > 0)
444	<	gotview++;
445	<	break;
446	<	}
441	>	avgview.horiz *= f;
442	>	avgview.vert *= f;
443	>	avgview.hoff *= f;
444	>	avgview.voff *= f;
445	>	avgview.vfore *= f;
446	>	avgview.vaft *= f;
447	>	if (setview(&avgview) != NULL)          /* in case of emergency... */
448	>	avgview = ourview;
449	>	pixaspect = viewaspect(&avgview) * hresolu / vresolu;
450		}
451
452
453	<	addpicture(pfile, zspec)                /* add picture to output */
454	<	char    *pfile, *zspec;
453	>	static void
454	>	addpicture(             /* add picture to output */
455	>	char    *pfile,
456	>	char    *zspec
457	>	)
458		{
245	–	extern double   atof();
459		FILE    *pfp;
460		int     zfd;
461		char    *err;
462		COLR    *scanin;
463		float   *zin;
464		struct position *plast;
465	+	struct bound    *xlim, ylim;
466		int     y;
467		/* open picture file */
468	<	if ((pfp = fopen(pfile, "r")) == NULL) {
469	<	perror(pfile);
256	<	exit(1);
257	<	}
468	>	if ((pfp = fopen(pfile, "r")) == NULL)
469	>	syserror(pfile);
470		/* get header with exposure and view */
471		theirexp = 1.0;
472	+	theirview = stdview;
473		gotview = 0;
474	<	printf("%s:\n", pfile);
475	<	getheader(pfp, headline);
476	<	if (!gotview || fgetresolu(&thresolu, &tvresolu, pfp)
477	<	!= (YMAJOR|YDECR)) {
478	<	fprintf(stderr, "%s: picture view error\n", pfile);
474	>	if (nvavg < 2)
475	>	printf("%s:\n", pfile);
476	>	getheader(pfp, headline, NULL);
477	>	if (wrongformat || !gotview || !fgetsresolu(&tresolu, pfp)) {
478	>	fprintf(stderr, "%s: picture format error\n", pfile);
479		exit(1);
480		}
481		if (ourexp <= 0)
482		ourexp = theirexp;
483		else if (ABS(theirexp-ourexp) > .01*ourexp)
484		fprintf(stderr, "%s: different exposure (warning)\n", pfile);
485	<	if (err = setview(&theirview)) {
485	>	if ( (err = setview(&theirview)) ) {
486		fprintf(stderr, "%s: %s\n", pfile, err);
487		exit(1);
488		}
489		/* compute transformation */
490	<	pixform(theirs2ours, &theirview, &ourview);
278	<	/* allocate scanlines */
279	<	scanin = (COLR *)malloc(thresolu*sizeof(COLR));
280	<	zin = (float *)malloc(thresolu*sizeof(float));
281	<	plast = (struct position *)calloc(thresolu, sizeof(struct position));
282	<	if (scanin == NULL || zin == NULL || plast == NULL)
283	<	syserror();
490	>	hasmatrix = pixform(theirs2ours, &theirview, &ourview);
491		/* get z specification or file */
492	+	zin = (float *)malloc(scanlen(&tresolu)*sizeof(float));
493	+	if (zin == NULL)
494	+	syserror(progname);
495		if ((zfd = open(zspec, O_RDONLY)) == -1) {
496		double  zvalue;
497		register int    x;
498	<	if (!isfloat(zspec) || (zvalue = atof(zspec)) <= 0.0) {
499	<	perror(zspec);
500	<	exit(1);
291	<	}
292	<	for (x = 0; x < thresolu; x++)
498	>	if (!isflt(zspec) || (zvalue = atof(zspec)) <= 0.0)
499	>	syserror(zspec);
500	>	for (x = scanlen(&tresolu); x-- > 0; )
501		zin[x] = zvalue;
502		}
503	<	/* load image */
504	<	for (y = tvresolu-1; y >= 0; y--) {
505	<	if (freadcolrs(scanin, thresolu, pfp) < 0) {
503	>	/* compute transferrable perimeter */
504	>	xlim = (struct bound *)malloc(numscans(&tresolu)*sizeof(struct bound));
505	>	if (xlim == NULL)
506	>	syserror(progname);
507	>	if (!getperim(xlim, &ylim, zin, zfd)) { /* overlapping area? */
508	>	free((void *)zin);
509	>	free((void *)xlim);
510	>	if (zfd != -1)
511	>	close(zfd);
512	>	fclose(pfp);
513	>	return;
514	>	}
515	>	/* allocate scanlines */
516	>	scanin = (COLR *)malloc(scanlen(&tresolu)*sizeof(COLR));
517	>	plast = (struct position *)calloc(scanlen(&tresolu),
518	>	sizeof(struct position));
519	>	if ((scanin == NULL) | (plast == NULL))
520	>	syserror(progname);
521	>	/* skip to starting point */
522	>	for (y = 0; y < ylim.min; y++)
523	>	if (freadcolrs(scanin, scanlen(&tresolu), pfp) < 0) {
524		fprintf(stderr, "%s: read error\n", pfile);
525		exit(1);
526		}
527	<	if (zfd != -1 && read(zfd,zin,thresolu*sizeof(float))
528	<	< thresolu*sizeof(float)) {
529	<	fprintf(stderr, "%s: read error\n", zspec);
527	>	if (zfd != -1 && lseek(zfd,
528	>	(off_t)ylim.min*scanlen(&tresolu)*sizeof(float),
529	>	SEEK_SET) < 0)
530	>	syserror(zspec);
531	>	/* load image */
532	>	for (y = ylim.min; y <= ylim.max; y++) {
533	>	if (freadcolrs(scanin, scanlen(&tresolu), pfp) < 0) {
534	>	fprintf(stderr, "%s: read error\n", pfile);
535		exit(1);
536		}
537	<	addscanline(y, scanin, zin, plast);
537	>	if (zfd != -1 && read(zfd, (char *)zin,
538	>	scanlen(&tresolu)*sizeof(float))
539	>	< scanlen(&tresolu)*sizeof(float))
540	>	syserror(zspec);
541	>	addscanline(xlim+y, y, scanin, zin, plast);
542		}
543		/* clean up */
544	<	free((char *)scanin);
545	<	free((char *)zin);
546	<	free((char *)plast);
544	>	free((void *)xlim);
545	>	free((void *)scanin);
546	>	free((void *)zin);
547	>	free((void *)plast);
548		fclose(pfp);
549		if (zfd != -1)
550		close(zfd);
551		}
552
553
554	<	pixform(xfmat, vw1, vw2)                /* compute view1 to view2 matrix */
555	<	register double xfmat[4][4];
556	<	register VIEW   *vw1, *vw2;
554	>	static int
555	>	pixform(                /* compute view1 to view2 matrix */
556	>	register MAT4   xfmat,
557	>	register VIEW   *vw1,
558	>	register VIEW   *vw2
559	>	)
560		{
561		double  m4t[4][4];
562
563	+	if ((vw1->type != VT_PER) & (vw1->type != VT_PAR))
564	+	return(0);
565	+	if ((vw2->type != VT_PER) & (vw2->type != VT_PAR))
566	+	return(0);
567		setident4(xfmat);
568		xfmat[0][0] = vw1->hvec[0];
569		xfmat[0][1] = vw1->hvec[1];
#	Line 348 | Line 591 | register VIEW  *vw1, *vw2;
591		m4t[2][2] = vw2->vdir[2];
592		m4t[3][2] = -DOT(vw2->vp,vw2->vdir);
593		multmat4(xfmat, xfmat, m4t);
594	+	return(1);
595		}
596
597
598	<	addscanline(y, pline, zline, lasty)     /* add scanline to output */
599	<	int     y;
600	<	COLR    *pline;
601	<	float   *zline;
602	<	struct position *lasty;         /* input/output */
598	>	static void
599	>	addscanline(    /* add scanline to output */
600	>	struct bound    *xl,
601	>	int     y,
602	>	COLR    *pline,
603	>	float   *zline,
604	>	struct position *lasty          /* input/output */
605	>	)
606		{
607	<	extern double   sqrt();
361	<	double  pos[3];
607	>	FVECT   pos;
608		struct position lastx, newpos;
609	+	double  wt;
610		register int    x;
611
612	<	for (x = thresolu-1; x >= 0; x--) {
613	<	pos[0] = (x+.5)/thresolu + theirview.hoff - .5;
614	<	pos[1] = (y+.5)/tvresolu + theirview.voff - .5;
612	>	lastx.z = 0;
613	>	for (x = xl->max; x >= xl->min; x--) {
614	>	pix2loc(pos, &tresolu, x, y);
615		pos[2] = zline[x];
616	<	if (theirview.type == VT_PER) {
370	<	if (normdist)   /* adjust for eye-ray distance */
371	<	pos[2] /= sqrt( 1.
372	<	+ pos[0]*pos[0]*theirview.hn2
373	<	+ pos[1]*pos[1]*theirview.vn2 );
374	<	pos[0] *= pos[2];
375	<	pos[1] *= pos[2];
376	<	}
377	<	multp3(pos, pos, theirs2ours);
378	<	if (pos[2] <= 0) {
616	>	if ((wt = movepixel(pos)) <= FTINY) {
617		lasty[x].z = lastx.z = 0;       /* mark invalid */
618		continue;
619		}
620	<	if (ourview.type == VT_PER) {
383	<	pos[0] /= pos[2];
384	<	pos[1] /= pos[2];
385	<	}
386	<	pos[0] += .5 - ourview.hoff;
387	<	pos[1] += .5 - ourview.voff;
620	>	/* add pixel to our image */
621		newpos.x = pos[0] * hresolu;
622		newpos.y = pos[1] * vresolu;
623		newpos.z = zline[x];
624	<	/* add pixel to our image */
625	<	if (pos[0] >= 0 && newpos.x < hresolu
626	<	&& pos[1] >= 0 && newpos.y < vresolu) {
627	<	addpixel(&newpos, &lastx, &lasty[x], pline[x], pos[2]);
395	<	lasty[x].x = lastx.x = newpos.x;
396	<	lasty[x].y = lastx.y = newpos.y;
397	<	lasty[x].z = lastx.z = newpos.z;
398	<	} else
399	<	lasty[x].z = lastx.z = 0;       /* mark invalid */
624	>	addpixel(&newpos, &lastx, &lasty[x], pline[x], wt, pos[2]);
625	>	lasty[x].x = lastx.x = newpos.x;
626	>	lasty[x].y = lastx.y = newpos.y;
627	>	lasty[x].z = lastx.z = newpos.z;
628		}
629		}
630
631
632	<	addpixel(p0, p1, p2, pix, z)            /* fill in pixel parallelogram */
633	<	struct position *p0, *p1, *p2;
634	<	COLR    pix;
635	<	double  z;
632	>	static void
633	>	addpixel(               /* fill in pixel parallelogram */
634	>	struct position *p0,
635	>	struct position *p1,
636	>	struct position *p2,
637	>	COLR    pix,
638	>	double  w,
639	>	double  z
640	>	)
641		{
642		double  zt = 2.*zeps*p0->z;             /* threshold */
643	+	COLOR   pval;                           /* converted+weighted pixel */
644		int     s1x, s1y, s2x, s2y;             /* step sizes */
645		int     l1, l2, c1, c2;                 /* side lengths and counters */
646		int     p1isy;                          /* p0p1 along y? */
#	Line 414 | Line 648 | double z;
648		register int    x, y;                   /* final position */
649
650		/* compute vector p0p1 */
651	<	if (fill&F_FORE && ABS(p1->z-p0->z) <= zt) {
651	>	if (fillo&F_FORE && ABS(p1->z-p0->z) <= zt) {
652		s1x = p1->x - p0->x;
653		s1y = p1->y - p0->y;
654		l1 = ABS(s1x);
655	<	if (p1isy = (ABS(s1y) > l1))
655	>	if ( (p1isy = (ABS(s1y) > l1)) )
656		l1 = ABS(s1y);
657	+	else if (l1 < 1)
658	+	l1 = 1;
659		} else {
660		l1 = s1x = s1y = 1;
661		p1isy = -1;
662		}
663		/* compute vector p0p2 */
664	<	if (fill&F_FORE && ABS(p2->z-p0->z) <= zt) {
664	>	if (fillo&F_FORE && ABS(p2->z-p0->z) <= zt) {
665		s2x = p2->x - p0->x;
666		s2y = p2->y - p0->y;
667		if (p1isy == 1)
#	Line 435 | Line 671 | double z;
671		if (p1isy != 0 && ABS(s2x) > l2)
672		l2 = ABS(s2x);
673		}
674	+	if (l2 < 1)
675	+	l2 = 1;
676		} else
677		l2 = s2x = s2y = 1;
678		/* fill the parallelogram */
679	+	if (averaging) {
680	+	colr_color(pval, pix);
681	+	scalecolor(pval, w);
682	+	}
683		for (c1 = l1; c1-- > 0; ) {
684		x1 = p0->x + c1*s1x/l1;
685		y1 = p0->y + c1*s1y/l1;
686		for (c2 = l2; c2-- > 0; ) {
687		x = x1 + c2*s2x/l2;
688	+	if ((x < 0) | (x >= hresolu))
689	+	continue;
690		y = y1 + c2*s2y/l2;
691	<	if (zscan(y)[x] <= 0 || zscan(y)[x]-z
691	>	if ((y < 0) | (y >= vresolu))
692	>	continue;
693	>	if (averaging) {
694	>	if (zscan(y)[x] <= 0 || zscan(y)[x]-z
695		> zeps*zscan(y)[x]) {
696	<	zscan(y)[x] = z;
696	>	copycolor(sscan(y)[x], pval);
697	>	wscan(y)[x] = w;
698	>	zscan(y)[x] = z;
699	>	} else if (z-zscan(y)[x] <= zeps*zscan(y)[x]) {
700	>	addcolor(sscan(y)[x], pval);
701	>	wscan(y)[x] += w;
702	>	}
703	>	} else if (zscan(y)[x] <= 0 || zscan(y)[x]-z
704	>	> zeps*zscan(y)[x]) {
705		copycolr(pscan(y)[x], pix);
706	+	zscan(y)[x] = z;
707		}
708		}
709		}
710		}
711
712
713	<	backpicture()                           /* background fill algorithm */
713	>	static double
714	>	movepixel(                              /* reposition image point */
715	>	register FVECT  pos
716	>	)
717		{
718	+	FVECT   pt, tdir, odir;
719	+	double  d;
720	+
721	+	if (pos[2] <= 0)                /* empty pixel */
722	+	return(0);
723	+	if (usematrix) {
724	+	pos[0] += theirview.hoff - .5;
725	+	pos[1] += theirview.voff - .5;
726	+	if (normdist & (theirview.type == VT_PER))
727	+	d = sqrt(1. + pos[0]*pos[0]*theirview.hn2
728	+	+ pos[1]*pos[1]*theirview.vn2);
729	+	else
730	+	d = 1.;
731	+	pos[2] += d*theirview.vfore;
732	+	if (theirview.type == VT_PER) {
733	+	pos[2] /= d;
734	+	pos[0] *= pos[2];
735	+	pos[1] *= pos[2];
736	+	}
737	+	multp3(pos, pos, theirs2ours);
738	+	if (pos[2] <= ourview.vfore)
739	+	return(0);
740	+	if (ourview.type == VT_PER) {
741	+	pos[0] /= pos[2];
742	+	pos[1] /= pos[2];
743	+	}
744	+	pos[0] += .5 - ourview.hoff;
745	+	pos[1] += .5 - ourview.voff;
746	+	pos[2] -= ourview.vfore;
747	+	} else {
748	+	if (viewray(pt, tdir, &theirview, pos[0], pos[1]) < -FTINY)
749	+	return(0);
750	+	if ((!normdist) & (theirview.type == VT_PER))   /* adjust */
751	+	pos[2] *= sqrt(1. + pos[0]*pos[0]*theirview.hn2
752	+	+ pos[1]*pos[1]*theirview.vn2);
753	+	pt[0] += tdir[0]*pos[2];
754	+	pt[1] += tdir[1]*pos[2];
755	+	pt[2] += tdir[2]*pos[2];
756	+	viewloc(pos, &ourview, pt);
757	+	if (pos[2] <= 0)
758	+	return(0);
759	+	}
760	+	if ((pos[0] < 0) | (pos[0] >= 1-FTINY) | (pos[1] < 0) | (pos[1] >= 1-FTINY))
761	+	return(0);
762	+	if (!averaging)
763	+	return(1);
764	+	/* compute pixel weight */
765	+	if (ourview.type == VT_PAR) {
766	+	d = DOT(ourview.vdir,tdir);
767	+	d = 1. - d*d;
768	+	} else {
769	+	VSUB(odir, pt, ourview.vp);
770	+	d = DOT(odir,tdir);
771	+	d = 1. - d*d/DOT(odir,odir);
772	+	}
773	+	if (d <= 1./MAXWT/MAXWT)
774	+	return(MAXWT);          /* clip to maximum weight */
775	+	return(1./sqrt(d));
776	+	}
777	+
778	+
779	+	static int
780	+	getperim(               /* compute overlapping image area */
781	+	register struct bound   *xl,
782	+	struct bound    *yl,
783	+	float   *zline,
784	+	int     zfd
785	+	)
786	+	{
787	+	int     step;
788	+	FVECT   pos;
789	+	register int    x, y;
790	+	/* set up step size */
791	+	if (scanlen(&tresolu) < numscans(&tresolu))
792	+	step = scanlen(&tresolu)/NSTEPS;
793	+	else
794	+	step = numscans(&tresolu)/NSTEPS;
795	+	if (step < MINSTEP) {                   /* not worth cropping? */
796	+	yl->min = 0;
797	+	yl->max = numscans(&tresolu) - 1;
798	+	x = scanlen(&tresolu) - 1;
799	+	for (y = numscans(&tresolu); y--; ) {
800	+	xl[y].min = 0;
801	+	xl[y].max = x;
802	+	}
803	+	return(1);
804	+	}
805	+	yl->min = 32000; yl->max = 0;           /* search for points on image */
806	+	for (y = step - 1; y < numscans(&tresolu); y += step) {
807	+	if (zfd != -1) {
808	+	if (lseek(zfd, (off_t)y*scanlen(&tresolu)*sizeof(float),
809	+	SEEK_SET) < 0)
810	+	syserror("lseek");
811	+	if (read(zfd, (char *)zline,
812	+	scanlen(&tresolu)*sizeof(float))
813	+	< scanlen(&tresolu)*sizeof(float))
814	+	syserror("read");
815	+	}
816	+	xl[y].min = 32000; xl[y].max = 0;               /* x max */
817	+	for (x = scanlen(&tresolu); (x -= step) > 0; ) {
818	+	pix2loc(pos, &tresolu, x, y);
819	+	pos[2] = zline[x];
820	+	if (movepixel(pos) > FTINY) {
821	+	xl[y].max = x + step - 1;
822	+	xl[y].min = x - step + 1;       /* x min */
823	+	if (xl[y].min < 0)
824	+	xl[y].min = 0;
825	+	for (x = step - 1; x < xl[y].max; x += step) {
826	+	pix2loc(pos, &tresolu, x, y);
827	+	pos[2] = zline[x];
828	+	if (movepixel(pos) > FTINY) {
829	+	xl[y].min = x - step + 1;
830	+	break;
831	+	}
832	+	}
833	+	if (y < yl->min)                /* y limits */
834	+	yl->min = y - step + 1;
835	+	yl->max = y + step - 1;
836	+	break;
837	+	}
838	+	}
839	+	/* fill in between */
840	+	if (y < step) {
841	+	xl[y-1].min = xl[y].min;
842	+	xl[y-1].max = xl[y].max;
843	+	} else {
844	+	if (xl[y].min < xl[y-step].min)
845	+	xl[y-1].min = xl[y].min;
846	+	else
847	+	xl[y-1].min = xl[y-step].min;
848	+	if (xl[y].max > xl[y-step].max)
849	+	xl[y-1].max = xl[y].max;
850	+	else
851	+	xl[y-1].max = xl[y-step].max;
852	+	}
853	+	for (x = 2; x < step; x++)
854	+	*(xl+y-x) = *(xl+y-1);
855	+	}
856	+	if (yl->max >= numscans(&tresolu))
857	+	yl->max = numscans(&tresolu) - 1;
858	+	y -= step;
859	+	for (x = numscans(&tresolu) - 1; x > y; x--)    /* fill bottom rows */
860	+	*(xl+x) = *(xl+y);
861	+	return(yl->max >= yl->min);
862	+	}
863	+
864	+
865	+	static void
866	+	backpicture(                    /* background fill algorithm */
867	+	fillfunc_t *fill,
868	+	int     samp
869	+	)
870	+	{
871		int     *yback, xback;
872		int     y;
461	–	COLR    pfill;
873		register int    x, i;
874		/* get back buffer */
875		yback = (int *)malloc(hresolu*sizeof(int));
876		if (yback == NULL)
877	<	syserror();
877	>	syserror(progname);
878		for (x = 0; x < hresolu; x++)
879		yback[x] = -2;
880		/*
#	Line 505 | Line 916 | backpicture()                          /* background fill algorithm */
916		xback = x-1;
917		}
918		/*
919	<	* Check to see if we have no background for
920	<	* this pixel.  If not, use background color.
919	>	* If we have no background for this pixel,
920	>	* use the given fill function.
921		*/
922	<	if (xback < 0 && yback[x] < 0) {
923	<	(*deffill)(x,y);
513	<	continue;
514	<	}
922	>	if (xback < 0 && yback[x] < 0)
923	>	goto fillit;
924		/*
925		* Compare, and use the background that is
926		* farther, unless one of them is next to us.
927	+	* If the background is too distant, call
928	+	* the fill function.
929		*/
930		if ( yback[x] < 0
931		|| (xback >= 0 && ABS(x-xback) <= 1)
932		|| ( ABS(y-yback[x]) > 1
933		&& zscan(yback[x])[x]
934		< zscan(y)[xback] ) ) {
935	<	copycolr(pscan(y)[x],pscan(y)[xback]);
935	>	if (samp > 0 && ABS(x-xback) >= samp)
936	>	goto fillit;
937	>	if (averaging) {
938	>	copycolor(sscan(y)[x],
939	>	sscan(y)[xback]);
940	>	wscan(y)[x] = wscan(y)[xback];
941	>	} else
942	>	copycolr(pscan(y)[x],
943	>	pscan(y)[xback]);
944		zscan(y)[x] = zscan(y)[xback];
945		} else {
946	<	copycolr(pscan(y)[x],pscan(yback[x])[x]);
946	>	if (samp > 0 && ABS(y-yback[x]) > samp)
947	>	goto fillit;
948	>	if (averaging) {
949	>	copycolor(sscan(y)[x],
950	>	sscan(yback[x])[x]);
951	>	wscan(y)[x] =
952	>	wscan(yback[x])[x];
953	>	} else
954	>	copycolr(pscan(y)[x],
955	>	pscan(yback[x])[x]);
956		zscan(y)[x] = zscan(yback[x])[x];
957		}
958	+	continue;
959	+	fillit:
960	+	(*fill)(x,y);
961	+	if (fill == rcalfill) {         /* use it */
962	+	clearqueue();
963	+	xback = x;
964	+	yback[x] = y;
965	+	}
966		} else {                                /* full pixel */
967		yback[x] = -2;
968		xback = -2;
969		}
970		}
971	<	free((char *)yback);
971	>	free((void *)yback);
972		}
973
974
975	<	fillpicture()                           /* paint in empty pixels with default */
975	>	static void
976	>	fillpicture(            /* paint in empty pixels using fill */
977	>	fillfunc_t *fill
978	>	)
979		{
980		register int    x, y;
981
982		for (y = 0; y < vresolu; y++)
983		for (x = 0; x < hresolu; x++)
984		if (zscan(y)[x] <= 0)
985	<	(*deffill)(x,y);
985	>	(*fill)(x,y);
986	>	if (fill == rcalfill)
987	>	clearqueue();
988		}
989
990
991	<	writepicture()                          /* write out picture */
991	>	static int
992	>	clipaft(void)                   /* perform aft clipping as indicated */
993		{
994	+	register int    x, y;
995	+	int     adjtest = (ourview.type == VT_PER) & zisnorm;
996	+	double  tstdist;
997	+	double  yzn2, vx;
998	+
999	+	if (ourview.vaft <= FTINY)
1000	+	return(0);
1001	+	tstdist = ourview.vaft - ourview.vfore;
1002	+	for (y = 0; y < vresolu; y++) {
1003	+	if (adjtest) {                          /* adjust test */
1004	+	yzn2 = (y+.5)/vresolu + ourview.voff - .5;
1005	+	yzn2 = 1. + yzn2*yzn2*ourview.vn2;
1006	+	tstdist = (ourview.vaft - ourview.vfore)*sqrt(yzn2);
1007	+	}
1008	+	for (x = 0; x < hresolu; x++)
1009	+	if (zscan(y)[x] > tstdist) {
1010	+	if (adjtest) {
1011	+	vx = (x+.5)/hresolu + ourview.hoff - .5;
1012	+	if (zscan(y)[x] <= (ourview.vaft -
1013	+	ourview.vfore) *
1014	+	sqrt(vx*vx*ourview.hn2 + yzn2))
1015	+	continue;
1016	+	}
1017	+	if (averaging)
1018	+	memset(sscan(y)[x], '\0', sizeof(COLOR));
1019	+	else
1020	+	memset(pscan(y)[x], '\0', sizeof(COLR));
1021	+	zscan(y)[x] = 0.0;
1022	+	}
1023	+	}
1024	+	return(1);
1025	+	}
1026	+
1027	+
1028	+	static int
1029	+	addblur(void)                           /* add to blurred picture */
1030	+	{
1031	+	COLOR   cval;
1032	+	double  d;
1033	+	register int    i;
1034	+
1035	+	if (!blurring)
1036	+	return(0);
1037	+	i = hresolu*vresolu;
1038	+	if (nvavg < 2)
1039	+	if (averaging)
1040	+	while (i--) {
1041	+	copycolor(ourbpict[i], ourspict[i]);
1042	+	d = 1.0/ourweigh[i];
1043	+	scalecolor(ourbpict[i], d);
1044	+	}
1045	+	else
1046	+	while (i--)
1047	+	colr_color(ourbpict[i], ourpict[i]);
1048	+	else
1049	+	if (averaging)
1050	+	while (i--) {
1051	+	copycolor(cval, ourspict[i]);
1052	+	d = 1.0/ourweigh[i];
1053	+	scalecolor(cval, d);
1054	+	addcolor(ourbpict[i], cval);
1055	+	}
1056	+	else
1057	+	while (i--) {
1058	+	colr_color(cval, ourpict[i]);
1059	+	addcolor(ourbpict[i], cval);
1060	+	}
1061	+	/* print view */
1062	+	printf("VIEW%d:", nvavg);
1063	+	fprintview(&ourview, stdout);
1064	+	putchar('\n');
1065	+	return(1);
1066	+	}
1067	+
1068	+
1069	+	static void
1070	+	writepicture(void)                              /* write out picture (alters buffer) */
1071	+	{
1072		int     y;
1073	+	register int    x;
1074	+	double  d;
1075
1076	<	fputresolu(YMAJOR|YDECR, hresolu, vresolu, stdout);
1076	>	fprtresolu(hresolu, vresolu, stdout);
1077		for (y = vresolu-1; y >= 0; y--)
1078	<	if (fwritecolrs(pscan(y), hresolu, stdout) < 0)
1079	<	syserror();
1078	>	if (blurring) {
1079	>	for (x = 0; x < hresolu; x++) { /* compute avg. */
1080	>	d = rexpadj/nvavg;
1081	>	scalecolor(bscan(y)[x], d);
1082	>	}
1083	>	if (fwritescan(bscan(y), hresolu, stdout) < 0)
1084	>	syserror(progname);
1085	>	} else if (averaging) {
1086	>	for (x = 0; x < hresolu; x++) { /* average pixels */
1087	>	d = rexpadj/wscan(y)[x];
1088	>	scalecolor(sscan(y)[x], d);
1089	>	}
1090	>	if (fwritescan(sscan(y), hresolu, stdout) < 0)
1091	>	syserror(progname);
1092	>	} else {
1093	>	if (expadj)
1094	>	shiftcolrs(pscan(y), hresolu, expadj);
1095	>	if (fwritecolrs(pscan(y), hresolu, stdout) < 0)
1096	>	syserror(progname);
1097	>	}
1098		}
1099
1100
1101	<	writedistance(fname)                    /* write out z file */
1102	<	char    *fname;
1101	>	static void
1102	>	writedistance(                  /* write out z file (alters buffer) */
1103	>	char    *fname
1104	>	)
1105		{
1106	<	extern double   sqrt();
1107	<	int     donorm = normdist && ourview.type == VT_PER;
1106	>	int     donorm = normdist & !zisnorm ? 1 :
1107	>	(ourview.type == VT_PER) & !normdist & zisnorm ? -1 : 0;
1108		int     fd;
1109		int     y;
568	–	float   *zout;
1110
1111	<	if ((fd = open(fname, O_WRONLY|O_CREAT|O_TRUNC, 0666)) == -1) {
1112	<	perror(fname);
572	<	exit(1);
573	<	}
574	<	if (donorm
575	<	&& (zout = (float *)malloc(hresolu*sizeof(float))) == NULL)
576	<	syserror();
1111	>	if ((fd = open(fname, O_WRONLY|O_CREAT|O_TRUNC, 0666)) == -1)
1112	>	syserror(fname);
1113		for (y = vresolu-1; y >= 0; y--) {
1114		if (donorm) {
1115	<	double  vx, yzn2;
1115	>	double  vx, yzn2, d;
1116		register int    x;
1117	<	yzn2 = y - .5*(vresolu-1);
1117	>	yzn2 = (y+.5)/vresolu + ourview.voff - .5;
1118		yzn2 = 1. + yzn2*yzn2*ourview.vn2;
1119		for (x = 0; x < hresolu; x++) {
1120	<	vx = x - .5*(hresolu-1);
1121	<	zout[x] = zscan(y)[x]
1122	<	* sqrt(vx*vx*ourview.hn2 + yzn2);
1120	>	vx = (x+.5)/hresolu + ourview.hoff - .5;
1121	>	d = sqrt(vx*vx*ourview.hn2 + yzn2);
1122	>	if (donorm > 0)
1123	>	zscan(y)[x] *= d;
1124	>	else
1125	>	zscan(y)[x] /= d;
1126		}
588	–	} else
589	–	zout = zscan(y);
590	–	if (write(fd, zout, hresolu*sizeof(float))
591	–	< hresolu*sizeof(float)) {
592	–	perror(fname);
593	–	exit(1);
1127		}
1128	+	if (write(fd, (char *)zscan(y), hresolu*sizeof(float))
1129	+	< hresolu*sizeof(float))
1130	+	syserror(fname);
1131		}
596	–	if (donorm)
597	–	free((char *)zout);
1132		close(fd);
1133		}
1134
1135
1136	<	isfloat(s)                              /* see if string is floating number */
1137	<	register char   *s;
1136	>	static void
1137	>	backfill(                               /* fill pixel with background */
1138	>	int     x,
1139	>	int     y
1140	>	)
1141		{
1142	<	for ( ; *s; s++)
1143	<	if ((*s < '0' || *s > '9') && *s != '.' && *s != '-'
1144	<	&& *s != 'e' && *s != 'E' && *s != '+')
1145	<	return(0);
1146	<	return(1);
610	<	}
611	<
612	<
613	<	backfill(x, y)                          /* fill pixel with background */
614	<	int     x, y;
615	<	{
616	<	register BYTE   *dest = pscan(y)[x];
617	<
618	<	copycolr(dest, backcolr);
1142	>	if (averaging) {
1143	>	copycolor(sscan(y)[x], backcolor);
1144	>	wscan(y)[x] = 1;
1145	>	} else
1146	>	copycolr(pscan(y)[x], backcolr);
1147		zscan(y)[x] = backz;
1148		}
1149
1150
1151	<	calstart(prog, args)                    /* start fill calculation */
1152	<	char    *prog, *args;
1151	>	static void
1152	>	calstart(                    /* start fill calculation */
1153	>	char    *prog,
1154	>	char    *args
1155	>	)
1156		{
1157		char    combuf[512];
1158	<	int     p0[2], p1[2];
1158	>	char    *argv[64];
1159	>	int     rval;
1160	>	register char   **wp, *cp;
1161
1162	<	if (childpid != -1) {
1162	>	if (PDesc.running) {
1163		fprintf(stderr, "%s: too many calculations\n", progname);
1164		exit(1);
1165		}
1166	<	sprintf(combuf, prog, PACKSIZ, args);
1167	<	if (pipe(p0) < 0 || pipe(p1) < 0)
1168	<	syserror();
1169	<	if ((childpid = vfork()) == 0) {        /* fork calculation */
1170	<	close(p0[1]);
1171	<	close(p1[0]);
1172	<	if (p0[0] != 0) {
1173	<	dup2(p0[0], 0);
1174	<	close(p0[0]);
1175	<	}
1176	<	if (p1[1] != 1) {
1177	<	dup2(p1[1], 1);
645	<	close(p1[1]);
646	<	}
647	<	execl("/bin/sh", "sh", "-c", combuf, 0);
648	<	perror("/bin/sh");
649	<	_exit(127);
1166	>	strcpy(combuf, prog);
1167	>	strcat(combuf, args);
1168	>	cp = combuf;
1169	>	wp = argv;
1170	>	for ( ; ; ) {
1171	>	while (isspace(*cp))    /* nullify spaces */
1172	>	*cp++ = '\0';
1173	>	if (!*cp)               /* all done? */
1174	>	break;
1175	>	*wp++ = cp;             /* add argument to list */
1176	>	while (*++cp && !isspace(*cp))
1177	>	;
1178		}
1179	<	if (childpid == -1)
1180	<	syserror();
1181	<	close(p0[0]);
1182	<	close(p1[1]);
1183	<	if ((psend = fdopen(p0[1], "w")) == NULL)
1184	<	syserror();
1185	<	if ((precv = fdopen(p1[0], "r")) == NULL)
1186	<	syserror();
1179	>	*wp = NULL;
1180	>	/* start process */
1181	>	if ((rval = open_process(&PDesc, argv)) < 0)
1182	>	syserror(progname);
1183	>	if (rval == 0) {
1184	>	fprintf(stderr, "%s: command not found\n", argv[0]);
1185	>	exit(1);
1186	>	}
1187	>	packsiz = rval/(6*sizeof(float)) - 1;
1188	>	if (packsiz > PACKSIZ)
1189	>	packsiz = PACKSIZ;
1190		queuesiz = 0;
1191		}
1192
1193
1194	<	caldone()                               /* done with calculation */
1194	>	static void
1195	>	caldone(void)                               /* done with calculation */
1196		{
1197	<	int     pid;
666	<
667	<	if (childpid == -1)
1197	>	if (!PDesc.running)
1198		return;
669	–	if (fclose(psend) == EOF)
670	–	syserror();
1199		clearqueue();
1200	<	fclose(precv);
673	<	while ((pid = wait(0)) != -1 && pid != childpid)
674	<	;
675	<	childpid = -1;
1200	>	close_process(&PDesc);
1201		}
1202
1203
1204	<	rcalfill(x, y)                          /* fill with ray-calculated pixel */
1205	<	int     x, y;
1204	>	static void
1205	>	rcalfill(                               /* fill with ray-calculated pixel */
1206	>	int     x,
1207	>	int     y
1208	>	)
1209		{
1210	<	FVECT   orig, dir;
683	<	float   outbuf[6];
684	<
685	<	if (queuesiz >= PACKSIZ) {      /* flush queue */
686	<	if (fflush(psend) == EOF)
687	<	syserror();
1210	>	if (queuesiz >= packsiz)        /* flush queue if needed */
1211		clearqueue();
1212	<	}
690	<	/* send new ray */
691	<	viewray(orig, dir, &ourview, (x+.5)/hresolu, (y+.5)/vresolu);
692	<	outbuf[0] = orig[0]; outbuf[1] = orig[1]; outbuf[2] = orig[2];
693	<	outbuf[3] = dir[0]; outbuf[4] = dir[1]; outbuf[5] = dir[2];
694	<	if (fwrite(outbuf, sizeof(float), 6, psend) < 6)
695	<	syserror();
696	<	/* remember it */
1212	>	/* add position to queue */
1213		queue[queuesiz][0] = x;
1214		queue[queuesiz][1] = y;
1215		queuesiz++;
1216		}
1217
1218
1219	<	clearqueue()                            /* get results from queue */
1219	>	static void
1220	>	clearqueue(void)                                /* process queue */
1221		{
1222	<	float   inbuf[4];
1222	>	FVECT   orig, dir;
1223	>	float   fbuf[6*(PACKSIZ+1)];
1224	>	register float  *fbp;
1225		register int    i;
1226	+	double  vx, vy;
1227
1228	+	if (queuesiz == 0)
1229	+	return;
1230	+	fbp = fbuf;
1231		for (i = 0; i < queuesiz; i++) {
1232	<	if (fread(inbuf, sizeof(float), 4, precv) < 4) {
1233	<	fprintf(stderr, "%s: read error in clearqueue\n",
1234	<	progname);
1235	<	exit(1);
1236	<	}
1232	>	viewray(orig, dir, &ourview,
1233	>	(queue[i][0]+.5)/hresolu,
1234	>	(queue[i][1]+.5)/vresolu);
1235	>	*fbp++ = orig[0]; *fbp++ = orig[1]; *fbp++ = orig[2];
1236	>	*fbp++ = dir[0]; *fbp++ = dir[1]; *fbp++ = dir[2];
1237	>	}
1238	>	/* mark end and get results */
1239	>	memset((char *)fbp, '\0', 6*sizeof(float));
1240	>	if (process(&PDesc, (char *)fbuf, (char *)fbuf,
1241	>	4*sizeof(float)*(queuesiz+1),
1242	>	6*sizeof(float)*(queuesiz+1)) !=
1243	>	4*sizeof(float)*(queuesiz+1)) {
1244	>	fprintf(stderr, "%s: error reading from rtrace process\n",
1245	>	progname);
1246	>	exit(1);
1247	>	}
1248	>	fbp = fbuf;
1249	>	for (i = 0; i < queuesiz; i++) {
1250		if (ourexp > 0 && ourexp != 1.0) {
1251	<	inbuf[0] *= ourexp;
1252	<	inbuf[1] *= ourexp;
1253	<	inbuf[2] *= ourexp;
1251	>	fbp[0] *= ourexp;
1252	>	fbp[1] *= ourexp;
1253	>	fbp[2] *= ourexp;
1254		}
1255	<	setcolr(pscan(queue[i][1])[queue[i][0]],
1256	<	inbuf[0], inbuf[1], inbuf[2]);
1257	<	zscan(queue[i][1])[queue[i][0]] = inbuf[3];
1255	>	if (averaging) {
1256	>	setcolor(sscan(queue[i][1])[queue[i][0]],
1257	>	fbp[0], fbp[1], fbp[2]);
1258	>	wscan(queue[i][1])[queue[i][0]] = 1;
1259	>	} else
1260	>	setcolr(pscan(queue[i][1])[queue[i][0]],
1261	>	fbp[0], fbp[1], fbp[2]);
1262	>	if (zisnorm)
1263	>	zscan(queue[i][1])[queue[i][0]] = fbp[3];
1264	>	else {
1265	>	vx = (queue[i][0]+.5)/hresolu + ourview.hoff - .5;
1266	>	vy = (queue[i][1]+.5)/vresolu + ourview.voff - .5;
1267	>	zscan(queue[i][1])[queue[i][0]] = fbp[3] / sqrt(1. +
1268	>	vx*vx*ourview.hn2 + vy*vy*ourview.vn2);
1269	>	}
1270	>	fbp += 4;
1271		}
1272		queuesiz = 0;
1273		}
1274
1275
1276	<	syserror()                      /* report error and exit */
1276	>	static void
1277	>	syserror(                       /* report error and exit */
1278	>	char    *s
1279	>	)
1280		{
1281	<	perror(progname);
1281	>	perror(s);
1282		exit(1);
1283		}

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