src/util/vwrays.c

#ifndef lint
static const char       RCSid[] = "$Id: vwrays.c,v 3.8 2003/10/20 16:01:55 greg Exp $";
#endif
/*
 * Compute rays corresponding to a given picture or view.
 */

#include "platform.h"
#include "standard.h"
#include "view.h"

extern int      putf(), putd(), puta();

int     (*putr)() = puta;

VIEW    vw = STDVIEW;

RESOLU  rs = {PIXSTANDARD, 512, 512};

double  pa = 1.;

int     zfd = -1;

int     fromstdin = 0;

char    *progname;


main(argc, argv)
int     argc;
char    *argv[];
{
        char    *err;
        int     rval, getdim = 0;
        register int    i;

        progname = argv[0];
        if (argc < 2)
                goto userr;
        for (i = 1; i < argc && argv[i][0] == '-'; i++)
                switch (argv[i][1]) {
                case 'f':                       /* output format */
                        switch (argv[i][2]) {
                        case 'a':                       /* ASCII */
                                putr = puta;
                                break;
                        case 'f':                       /* float */
                                putr = putf;
                                break;
                        case 'd':                       /* double */
                                putr = putd;
                                break;
                        default:
                                goto userr;
                        }
                        break;
                case 'v':                       /* view file or option */
                        if (argv[i][2] == 'f') {
                                rval = viewfile(argv[++i], &vw, NULL);
                                if (rval <= 0) {
                                        fprintf(stderr,
                                                "%s: no view in file\n",
                                                        argv[i]);
                                        exit(1);
                                }
                                break;
                        }
                        rval = getviewopt(&vw, argc-i, argv+i);
                        if (rval < 0)
                                goto userr;
                        i += rval;
                        break;
                case 'd':                       /* report dimensions only */
                        getdim++;
                        break;
                case 'x':                       /* x resolution */
                        rs.xr = atoi(argv[++i]);
                        if (rs.xr <= 0) {
                                fprintf(stderr, "%s: bad x resolution\n",
                                                progname);
                                exit(1);
                        }
                        break;
                case 'y':                       /* y resolution */
                        rs.yr = atoi(argv[++i]);
                        if (rs.yr <= 0) {
                                fprintf(stderr, "%s: bad y resolution\n",
                                                progname);
                                exit(1);
                        }
                        break;
                case 'p':                       /* pixel aspect ratio */
                        pa = atof(argv[++i]);
                        break;
                case 'i':                       /* get pixels from stdin */
                        fromstdin = 1;
                        break;
                default:
                        goto userr;
                }
        if ((i > argc) | (i+2 < argc))
                goto userr;
        if (i < argc) {
                rval = viewfile(argv[i], &vw, &rs);
                if (rval <= 0) {
                        fprintf(stderr, "%s: no view in picture\n", argv[i]);
                        exit(1);
                }
                if (i+1 < argc) {
                        zfd = open(argv[i+1], O_RDONLY);
                        if (zfd < 0) {
                                fprintf(stderr,
                                        "%s: cannot open depth buffer\n",
                                                argv[i+1]);
                                exit(1);
                        }
                }
        }
        if ((err = setview(&vw)) != NULL) {
                fprintf(stderr, "%s: %s\n", progname, err);
                exit(1);
        }
        if (i == argc)
                normaspect(viewaspect(&vw), &pa, &rs.xr, &rs.yr);
        if (getdim) {
                printf("-x %d -y %d -ld%c\n", rs.xr, rs.yr,
                                vw.vaft > FTINY ? '+' : '-');
                exit(0);
        }
        if (fromstdin)
                pix2rays(stdin);
        else
                putrays();
        exit(0);
userr:
        fprintf(stderr,
        "Usage: %s [ -i -f{a|f|d} | -d ] { view opts .. | picture [zbuf] }\n",
                        progname);
        exit(1);
}


pix2rays(FILE *fp)
{
        static FVECT    rorg, rdir;
        float   zval;
        double  px, py;
        int     pp[2];
        double  d;
        register int    i;

        while (fscanf(fp, "%lf %lf", &px, &py) == 2) {
                if (px < 0 || px >= rs.xr ||
                                py < 0 || py >= rs.yr) {
                        fprintf(stderr,
                                "%s: (x,y) pair (%.0f,%.0f) out of range\n",
                                        progname, px, py);
                        exit(1);
                }
                if (zfd >= 0) {
                        loc2pix(pp, &rs, px/rs.xr, py/rs.yr);
                        if (lseek(zfd,
                                (pp[1]*scanlen(&rs)+pp[0])*sizeof(float),
                                                SEEK_SET) < 0 ||
                                        read(zfd, &zval, sizeof(float))
                                                < sizeof(float)) {
                                fprintf(stderr, "%s: depth buffer read error\n",
                                                progname);
                                exit(1);
                        }
                }
                d = viewray(rorg, rdir, &vw, px/rs.xr, py/rs.yr);
                if (d < -FTINY)
                        rorg[0] = rorg[1] = rorg[2] =
                        rdir[0] = rdir[1] = rdir[2] = 0.;
                else if (zfd >= 0)
                        for (i = 0; i < 3; i++) {
                                rorg[i] += rdir[i]*zval;
                                rdir[i] = -rdir[i];
                        }
                else if (d > FTINY) {
                        rdir[0] *= d; rdir[1] *= d; rdir[2] *= d;
                }
                (*putr)(rorg, rdir);
        }
        if (!feof(fp)) {
                fprintf(stderr, "%s: expected px py on input\n", progname);
                exit(1);
        }
}


putrays()
{
        static RREAL    loc[2];
        static FVECT    rorg, rdir;
        float   *zbuf;
        int     sc;
        double  d;
        register int    si, i;

        if (zfd >= 0) {
                zbuf = (float *)malloc(scanlen(&rs)*sizeof(float));
                if (zbuf == NULL) {
                        fprintf(stderr, "%s: not enough memory\n", progname);
                        exit(1);
                }
        }
        for (sc = 0; sc < numscans(&rs); sc++) {
                if (zfd >= 0) {
                        if (read(zfd, zbuf, scanlen(&rs)*sizeof(float)) <
                                        scanlen(&rs)*sizeof(float)) {
                                fprintf(stderr, "%s: depth buffer read error\n",
                                                progname);
                                exit(1);
                        }
                }
                for (si = 0; si < scanlen(&rs); si++) {
                        pix2loc(loc, &rs, si, sc);
                        d = viewray(rorg, rdir, &vw, loc[0], loc[1]);
                        if (d < -FTINY)
                                rorg[0] = rorg[1] = rorg[2] =
                                rdir[0] = rdir[1] = rdir[2] = 0.;
                        else if (zfd >= 0)
                                for (i = 0; i < 3; i++) {
                                        rorg[i] += rdir[i]*zbuf[si];
                                        rdir[i] = -rdir[i];
                                }
                        else if (d > FTINY) {
                                rdir[0] *= d; rdir[1] *= d; rdir[2] *= d;
                        }
                        (*putr)(rorg, rdir);
                }
        }
        if (zfd >= 0)
                free((void *)zbuf);
}


puta(ro, rd)            /* put out ray in ASCII format */
FVECT   ro, rd;
{
        printf("%.5e %.5e %.5e %.5e %.5e %.5e\n",
                        ro[0], ro[1], ro[2],
                        rd[0], rd[1], rd[2]);
}


putf(ro, rd)            /* put out ray in float format */
FVECT   ro, rd;
{
        float v[6];

        v[0] = ro[0]; v[1] = ro[1]; v[2] = ro[2];
        v[3] = rd[0]; v[4] = rd[1]; v[5] = rd[2];
        fwrite(v, sizeof(float), 6, stdout);
}


putd(ro, rd)            /* put out ray in double format */
FVECT   ro, rd;
{
        double v[6];

        v[0] = ro[0]; v[1] = ro[1]; v[2] = ro[2];
        v[3] = rd[0]; v[4] = rd[1]; v[5] = rd[2];
        fwrite(v, sizeof(double), 6, stdout);
}
Revision:	3.9
Committed:	Wed Oct 22 02:06:35 2003 UTC (20 years, 6 months ago) by greg
Content type:	text/plain
Branch:	MAIN
Changes since 3.8:	+2 -4 lines
Log Message:	Fewer complaints if "platform.h" precedes "standard.h"
#	User	Rev	Content
1	gregl	3.1	#ifndef lint
2	greg	3.9	static const char RCSid[] = "$Id: vwrays.c,v 3.8 2003/10/20 16:01:55 greg Exp $";
3	gregl	3.1	#endif
4			/*
5			* Compute rays corresponding to a given picture or view.
6			*/
7
8	greg	3.9	#include "platform.h"
9	gregl	3.1	#include "standard.h"
10			#include "view.h"
11
12			extern int putf(), putd(), puta();
13
14			int (*putr)() = puta;
15
16			VIEW vw = STDVIEW;
17
18			RESOLU rs = {PIXSTANDARD, 512, 512};
19
20			double pa = 1.;
21
22			int zfd = -1;
23
24	greg	3.4	int fromstdin = 0;
25
26	gregl	3.1	char *progname;
27
28
29			main(argc, argv)
30			int argc;
31			char *argv[];
32			{
33			char *err;
34			int rval, getdim = 0;
35			register int i;
36
37			progname = argv[0];
38			if (argc < 2)
39			goto userr;
40			for (i = 1; i < argc && argv[i][0] == '-'; i++)
41			switch (argv[i][1]) {
42			case 'f': /* output format */
43			switch (argv[i][2]) {
44			case 'a': /* ASCII */
45			putr = puta;
46			break;
47			case 'f': /* float */
48			putr = putf;
49			break;
50			case 'd': /* double */
51			putr = putd;
52			break;
53			default:
54			goto userr;
55			}
56			break;
57			case 'v': /* view file or option */
58			if (argv[i][2] == 'f') {
59			rval = viewfile(argv[++i], &vw, NULL);
60			if (rval <= 0) {
61			fprintf(stderr,
62			"%s: no view in file\n",
63			argv[i]);
64			exit(1);
65			}
66			break;
67			}
68			rval = getviewopt(&vw, argc-i, argv+i);
69			if (rval < 0)
70			goto userr;
71			i += rval;
72			break;
73			case 'd': /* report dimensions only */
74			getdim++;
75			break;
76			case 'x': /* x resolution */
77			rs.xr = atoi(argv[++i]);
78			if (rs.xr <= 0) {
79			fprintf(stderr, "%s: bad x resolution\n",
80			progname);
81			exit(1);
82			}
83			break;
84			case 'y': /* y resolution */
85			rs.yr = atoi(argv[++i]);
86			if (rs.yr <= 0) {
87			fprintf(stderr, "%s: bad y resolution\n",
88			progname);
89			exit(1);
90			}
91			break;
92			case 'p': /* pixel aspect ratio */
93			pa = atof(argv[++i]);
94			break;
95	greg	3.4	case 'i': /* get pixels from stdin */
96			fromstdin = 1;
97			break;
98	gregl	3.1	default:
99			goto userr;
100			}
101	schorsch	3.7	if ((i > argc) \| (i+2 < argc))
102	gregl	3.1	goto userr;
103			if (i < argc) {
104			rval = viewfile(argv[i], &vw, &rs);
105			if (rval <= 0) {
106			fprintf(stderr, "%s: no view in picture\n", argv[i]);
107			exit(1);
108			}
109			if (i+1 < argc) {
110			zfd = open(argv[i+1], O_RDONLY);
111			if (zfd < 0) {
112			fprintf(stderr,
113			"%s: cannot open depth buffer\n",
114			argv[i+1]);
115			exit(1);
116			}
117			}
118			}
119			if ((err = setview(&vw)) != NULL) {
120			fprintf(stderr, "%s: %s\n", progname, err);
121			exit(1);
122			}
123			if (i == argc)
124			normaspect(viewaspect(&vw), &pa, &rs.xr, &rs.yr);
125			if (getdim) {
126	gregl	3.3	printf("-x %d -y %d -ld%c\n", rs.xr, rs.yr,
127			vw.vaft > FTINY ? '+' : '-');
128	gregl	3.1	exit(0);
129			}
130	greg	3.4	if (fromstdin)
131			pix2rays(stdin);
132			else
133			putrays();
134	gregl	3.1	exit(0);
135			userr:
136			fprintf(stderr,
137	greg	3.4	"Usage: %s [ -i -f{a\|f\|d} \| -d ] { view opts .. \| picture [zbuf] }\n",
138	gregl	3.1	progname);
139			exit(1);
140			}
141
142
143	greg	3.4	pix2rays(FILE *fp)
144			{
145			static FVECT rorg, rdir;
146			float zval;
147			double px, py;
148			int pp[2];
149			double d;
150			register int i;
151
152			while (fscanf(fp, "%lf %lf", &px, &py) == 2) {
153			if (px < 0 \|\| px >= rs.xr \|\|
154			py < 0 \|\| py >= rs.yr) {
155			fprintf(stderr,
156			"%s: (x,y) pair (%.0f,%.0f) out of range\n",
157			progname, px, py);
158			exit(1);
159			}
160			if (zfd >= 0) {
161			loc2pix(pp, &rs, px/rs.xr, py/rs.yr);
162			if (lseek(zfd,
163	greg	3.8	(pp[1]scanlen(&rs)+pp[0])sizeof(float),
164			SEEK_SET) < 0 \|\|
165	greg	3.4	read(zfd, &zval, sizeof(float))
166	greg	3.8	< sizeof(float)) {
167	greg	3.4	fprintf(stderr, "%s: depth buffer read error\n",
168			progname);
169			exit(1);
170			}
171			}
172			d = viewray(rorg, rdir, &vw, px/rs.xr, py/rs.yr);
173			if (d < -FTINY)
174			rorg[0] = rorg[1] = rorg[2] =
175			rdir[0] = rdir[1] = rdir[2] = 0.;
176			else if (zfd >= 0)
177			for (i = 0; i < 3; i++) {
178			rorg[i] += rdir[i]*zval;
179			rdir[i] = -rdir[i];
180			}
181			else if (d > FTINY) {
182			rdir[0] = d; rdir[1] = d; rdir[2] *= d;
183			}
184			(*putr)(rorg, rdir);
185			}
186			if (!feof(fp)) {
187			fprintf(stderr, "%s: expected px py on input\n", progname);
188			exit(1);
189			}
190			}
191
192
193	gregl	3.1	putrays()
194			{
195	schorsch	3.5	static RREAL loc[2];
196	gregl	3.2	static FVECT rorg, rdir;
197	gregl	3.1	float *zbuf;
198			int sc;
199	gregl	3.2	double d;
200	gregl	3.1	register int si, i;
201
202			if (zfd >= 0) {
203			zbuf = (float )malloc(scanlen(&rs)sizeof(float));
204			if (zbuf == NULL) {
205			fprintf(stderr, "%s: not enough memory\n", progname);
206			exit(1);
207			}
208			}
209			for (sc = 0; sc < numscans(&rs); sc++) {
210			if (zfd >= 0) {
211			if (read(zfd, zbuf, scanlen(&rs)*sizeof(float)) <
212			scanlen(&rs)*sizeof(float)) {
213			fprintf(stderr, "%s: depth buffer read error\n",
214			progname);
215			exit(1);
216			}
217			}
218			for (si = 0; si < scanlen(&rs); si++) {
219			pix2loc(loc, &rs, si, sc);
220	gregl	3.2	d = viewray(rorg, rdir, &vw, loc[0], loc[1]);
221			if (d < -FTINY)
222	gregl	3.1	rorg[0] = rorg[1] = rorg[2] =
223			rdir[0] = rdir[1] = rdir[2] = 0.;
224			else if (zfd >= 0)
225			for (i = 0; i < 3; i++) {
226			rorg[i] += rdir[i]*zbuf[si];
227			rdir[i] = -rdir[i];
228			}
229	gregl	3.2	else if (d > FTINY) {
230			rdir[0] = d; rdir[1] = d; rdir[2] *= d;
231			}
232	gregl	3.1	(*putr)(rorg, rdir);
233			}
234			}
235			if (zfd >= 0)
236	greg	3.4	free((void *)zbuf);
237	gregl	3.1	}
238
239
240			puta(ro, rd) /* put out ray in ASCII format */
241			FVECT ro, rd;
242			{
243			printf("%.5e %.5e %.5e %.5e %.5e %.5e\n",
244			ro[0], ro[1], ro[2],
245			rd[0], rd[1], rd[2]);
246			}
247
248
249			putf(ro, rd) /* put out ray in float format */
250			FVECT ro, rd;
251			{
252			float v[6];
253
254			v[0] = ro[0]; v[1] = ro[1]; v[2] = ro[2];
255			v[3] = rd[0]; v[4] = rd[1]; v[5] = rd[2];
256			fwrite(v, sizeof(float), 6, stdout);
257			}
258
259
260			putd(ro, rd) /* put out ray in double format */
261			FVECT ro, rd;
262			{
263			double v[6];
264
265			v[0] = ro[0]; v[1] = ro[1]; v[2] = ro[2];
266			v[3] = rd[0]; v[4] = rd[1]; v[5] = rd[2];
267			fwrite(v, sizeof(double), 6, stdout);
268			}