src/util/vwrays.c

#ifndef lint
static const char       RCSid[] = "$Id: vwrays.c,v 3.18 2016/08/18 00:52:48 greg Exp $";
#endif
/*
 * Compute rays corresponding to a given picture or view.
 */

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

typedef void putfunc(FVECT ro, FVECT rd);
static putfunc puta;
static putfunc putf;
static putfunc putd;
static void pix2rays(FILE *fp);
static void putrays(void);

static putfunc *putr = puta;

VIEW    vw = STDVIEW;

RESOLU  rs = {PIXSTANDARD, 512, 512};

double  pa = 1.;

double  pj = 0.;

int     zfd = -1;

int     fromstdin = 0;

int     unbuffered = 0;

int     repeatcnt = 1;

char    *progname;


int
main(
        int     argc,
        char    *argv[]
)
{
        char    *err;
        int     rval, getdim = 0;
        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;
                                SET_FILE_BINARY(stdout);
                                break;
                        case 'd':                       /* double */
                                putr = putd;
                                SET_FILE_BINARY(stdout);
                                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 'c':                       /* repeat count */
                        repeatcnt = atoi(argv[++i]);
                        break;
                case 'p':                       /* pixel aspect or jitter */
                        if (argv[i][2] == 'a')
                                pa = atof(argv[++i]);
                        else if (argv[i][2] == 'j')
                                pj = atof(argv[++i]);
                        else
                                goto userr;
                        break;
                case 'i':                       /* get pixels from stdin */
                        fromstdin = 1;
                        break;
                case 'u':                       /* unbuffered output */
                        unbuffered = 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 -u -f{a|f|d} -c rept | -d ] { view opts .. | picture [zbuf] }\n",
                        progname);
        exit(1);
}


static void
jitterloc(
        RREAL   loc[2]
)
{
        if (pj > FTINY) {
                loc[0] += pj*(.5 - frandom())/rs.xr;
                loc[1] += pj*(.5 - frandom())/rs.yr;
        }
}


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

        while (fscanf(fp, "%lf %lf", &px, &py) == 2) {
                px += .5; py += .5;
                loc[0] = px/rs.xr; loc[1] = py/rs.yr;
                if (zfd >= 0) {
                        if ((loc[0] < 0) | (loc[0] >= 1) |
                                        (loc[1] < 0) | (loc[1] >= 1)) {
                                fprintf(stderr, "%s: input pixel outside image\n",
                                                progname);
                                exit(1);
                        }
                        loc2pix(pp, &rs, loc[0], loc[1]);
                        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);
                        }
                }
                jitterloc(loc);
                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]*zval;
                                rdir[i] = -rdir[i];
                        }
                else if (d > FTINY) {
                        rdir[0] *= d; rdir[1] *= d; rdir[2] *= d;
                }
                (*putr)(rorg, rdir);
                if (unbuffered)
                        fflush(stdout);
        }
        if (!feof(fp)) {
                fprintf(stderr, "%s: expected px py on input\n", progname);
                exit(1);
        }
}


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

        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++) {
                    for (c = repeatcnt; c-- > 0; ) {
                        pix2loc(loc, &rs, si, sc);
                        jitterloc(loc);
                        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);
}


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


static void
putf(           /* put out ray in float format */
        FVECT   ro,
        FVECT   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];
        putbinary(v, sizeof(float), 6, stdout);
}


static void
putd(           /* put out ray in double format */
        FVECT   ro,
        FVECT   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];
        putbinary(v, sizeof(double), 6, stdout);
}
Revision:	3.19
Committed:	Mon Mar 4 22:41:20 2019 UTC (5 years, 1 month ago) by greg
Content type:	text/plain
Branch:	MAIN
Changes since 3.18:	+7 -1 lines
Log Message:	Added check for out-of-range input pixels when reading from depth buffer
#	User	Rev	Content
1	gregl	3.1	#ifndef lint
2	greg	3.19	static const char RCSid[] = "$Id: vwrays.c,v 3.18 2016/08/18 00:52:48 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	greg	3.12	#include "random.h"
11	gregl	3.1	#include "view.h"
12
13	schorsch	3.10	typedef void putfunc(FVECT ro, FVECT rd);
14			static putfunc puta;
15			static putfunc putf;
16			static putfunc putd;
17			static void pix2rays(FILE *fp);
18			static void putrays(void);
19	gregl	3.1
20	schorsch	3.10	static putfunc *putr = puta;
21	gregl	3.1
22			VIEW vw = STDVIEW;
23
24			RESOLU rs = {PIXSTANDARD, 512, 512};
25
26			double pa = 1.;
27
28	greg	3.12	double pj = 0.;
29
30	gregl	3.1	int zfd = -1;
31
32	greg	3.4	int fromstdin = 0;
33
34	greg	3.16	int unbuffered = 0;
35
36	greg	3.17	int repeatcnt = 1;
37
38	gregl	3.1	char *progname;
39
40
41	schorsch	3.10	int
42			main(
43			int argc,
44			char *argv[]
45			)
46	gregl	3.1	{
47			char *err;
48			int rval, getdim = 0;
49	greg	3.17	int i;
50	gregl	3.1
51			progname = argv[0];
52			if (argc < 2)
53			goto userr;
54			for (i = 1; i < argc && argv[i][0] == '-'; i++)
55			switch (argv[i][1]) {
56			case 'f': /* output format */
57			switch (argv[i][2]) {
58			case 'a': /* ASCII */
59			putr = puta;
60			break;
61			case 'f': /* float */
62			putr = putf;
63	greg	3.13	SET_FILE_BINARY(stdout);
64	gregl	3.1	break;
65			case 'd': /* double */
66			putr = putd;
67	greg	3.13	SET_FILE_BINARY(stdout);
68	gregl	3.1	break;
69			default:
70			goto userr;
71			}
72			break;
73			case 'v': /* view file or option */
74			if (argv[i][2] == 'f') {
75			rval = viewfile(argv[++i], &vw, NULL);
76			if (rval <= 0) {
77			fprintf(stderr,
78			"%s: no view in file\n",
79			argv[i]);
80			exit(1);
81			}
82			break;
83			}
84			rval = getviewopt(&vw, argc-i, argv+i);
85			if (rval < 0)
86			goto userr;
87			i += rval;
88			break;
89			case 'd': /* report dimensions only */
90			getdim++;
91			break;
92			case 'x': /* x resolution */
93			rs.xr = atoi(argv[++i]);
94			if (rs.xr <= 0) {
95			fprintf(stderr, "%s: bad x resolution\n",
96			progname);
97			exit(1);
98			}
99			break;
100			case 'y': /* y resolution */
101			rs.yr = atoi(argv[++i]);
102			if (rs.yr <= 0) {
103			fprintf(stderr, "%s: bad y resolution\n",
104			progname);
105			exit(1);
106			}
107			break;
108	greg	3.17	case 'c': /* repeat count */
109			repeatcnt = atoi(argv[++i]);
110			break;
111	greg	3.12	case 'p': /* pixel aspect or jitter */
112			if (argv[i][2] == 'a')
113			pa = atof(argv[++i]);
114			else if (argv[i][2] == 'j')
115	greg	3.15	pj = atof(argv[++i]);
116	greg	3.12	else
117			goto userr;
118	gregl	3.1	break;
119	greg	3.4	case 'i': /* get pixels from stdin */
120			fromstdin = 1;
121			break;
122	greg	3.16	case 'u': /* unbuffered output */
123			unbuffered = 1;
124			break;
125	gregl	3.1	default:
126			goto userr;
127			}
128	schorsch	3.7	if ((i > argc) \| (i+2 < argc))
129	gregl	3.1	goto userr;
130			if (i < argc) {
131			rval = viewfile(argv[i], &vw, &rs);
132			if (rval <= 0) {
133			fprintf(stderr, "%s: no view in picture\n", argv[i]);
134			exit(1);
135			}
136			if (i+1 < argc) {
137			zfd = open(argv[i+1], O_RDONLY);
138			if (zfd < 0) {
139			fprintf(stderr,
140			"%s: cannot open depth buffer\n",
141			argv[i+1]);
142			exit(1);
143			}
144			}
145			}
146			if ((err = setview(&vw)) != NULL) {
147			fprintf(stderr, "%s: %s\n", progname, err);
148			exit(1);
149			}
150			if (i == argc)
151			normaspect(viewaspect(&vw), &pa, &rs.xr, &rs.yr);
152			if (getdim) {
153	gregl	3.3	printf("-x %d -y %d -ld%c\n", rs.xr, rs.yr,
154			vw.vaft > FTINY ? '+' : '-');
155	gregl	3.1	exit(0);
156			}
157	greg	3.4	if (fromstdin)
158			pix2rays(stdin);
159			else
160			putrays();
161	gregl	3.1	exit(0);
162			userr:
163			fprintf(stderr,
164	greg	3.17	"Usage: %s [ -i -u -f{a\|f\|d} -c rept \| -d ] { view opts .. \| picture [zbuf] }\n",
165	gregl	3.1	progname);
166			exit(1);
167			}
168
169
170	schorsch	3.10	static void
171	greg	3.12	jitterloc(
172			RREAL loc[2]
173			)
174			{
175			if (pj > FTINY) {
176			loc[0] += pj*(.5 - frandom())/rs.xr;
177			loc[1] += pj*(.5 - frandom())/rs.yr;
178			}
179			}
180
181
182			static void
183	schorsch	3.10	pix2rays(
184			FILE *fp
185			)
186	greg	3.4	{
187			static FVECT rorg, rdir;
188			float zval;
189			double px, py;
190	greg	3.12	RREAL loc[2];
191	greg	3.4	int pp[2];
192			double d;
193	greg	3.17	int i;
194	greg	3.4
195			while (fscanf(fp, "%lf %lf", &px, &py) == 2) {
196	greg	3.11	px += .5; py += .5;
197	greg	3.12	loc[0] = px/rs.xr; loc[1] = py/rs.yr;
198	greg	3.4	if (zfd >= 0) {
199	greg	3.19	if ((loc[0] < 0) \| (loc[0] >= 1) \|
200			(loc[1] < 0) \| (loc[1] >= 1)) {
201			fprintf(stderr, "%s: input pixel outside image\n",
202			progname);
203			exit(1);
204			}
205	greg	3.12	loc2pix(pp, &rs, loc[0], loc[1]);
206	greg	3.4	if (lseek(zfd,
207	greg	3.8	(pp[1]scanlen(&rs)+pp[0])sizeof(float),
208			SEEK_SET) < 0 \|\|
209	greg	3.4	read(zfd, &zval, sizeof(float))
210	greg	3.8	< sizeof(float)) {
211	greg	3.4	fprintf(stderr, "%s: depth buffer read error\n",
212			progname);
213			exit(1);
214			}
215			}
216	greg	3.12	jitterloc(loc);
217			d = viewray(rorg, rdir, &vw, loc[0], loc[1]);
218	greg	3.4	if (d < -FTINY)
219			rorg[0] = rorg[1] = rorg[2] =
220			rdir[0] = rdir[1] = rdir[2] = 0.;
221			else if (zfd >= 0)
222			for (i = 0; i < 3; i++) {
223			rorg[i] += rdir[i]*zval;
224			rdir[i] = -rdir[i];
225			}
226			else if (d > FTINY) {
227			rdir[0] = d; rdir[1] = d; rdir[2] *= d;
228			}
229			(*putr)(rorg, rdir);
230	greg	3.16	if (unbuffered)
231			fflush(stdout);
232	greg	3.4	}
233			if (!feof(fp)) {
234			fprintf(stderr, "%s: expected px py on input\n", progname);
235			exit(1);
236			}
237			}
238
239
240	schorsch	3.10	static void
241			putrays(void)
242	gregl	3.1	{
243	greg	3.12	RREAL loc[2];
244			FVECT rorg, rdir;
245	schorsch	3.10	float *zbuf = NULL;
246	gregl	3.1	int sc;
247	gregl	3.2	double d;
248	greg	3.17	int si, i, c;
249	gregl	3.1
250			if (zfd >= 0) {
251			zbuf = (float )malloc(scanlen(&rs)sizeof(float));
252			if (zbuf == NULL) {
253			fprintf(stderr, "%s: not enough memory\n", progname);
254			exit(1);
255			}
256			}
257			for (sc = 0; sc < numscans(&rs); sc++) {
258			if (zfd >= 0) {
259			if (read(zfd, zbuf, scanlen(&rs)*sizeof(float)) <
260			scanlen(&rs)*sizeof(float)) {
261			fprintf(stderr, "%s: depth buffer read error\n",
262			progname);
263			exit(1);
264			}
265			}
266			for (si = 0; si < scanlen(&rs); si++) {
267	greg	3.17	for (c = repeatcnt; c-- > 0; ) {
268	gregl	3.1	pix2loc(loc, &rs, si, sc);
269	greg	3.12	jitterloc(loc);
270	gregl	3.2	d = viewray(rorg, rdir, &vw, loc[0], loc[1]);
271			if (d < -FTINY)
272	gregl	3.1	rorg[0] = rorg[1] = rorg[2] =
273			rdir[0] = rdir[1] = rdir[2] = 0.;
274			else if (zfd >= 0)
275			for (i = 0; i < 3; i++) {
276			rorg[i] += rdir[i]*zbuf[si];
277			rdir[i] = -rdir[i];
278			}
279	gregl	3.2	else if (d > FTINY) {
280			rdir[0] = d; rdir[1] = d; rdir[2] *= d;
281			}
282	gregl	3.1	(*putr)(rorg, rdir);
283	greg	3.17	}
284	gregl	3.1	}
285			}
286			if (zfd >= 0)
287	greg	3.4	free((void *)zbuf);
288	gregl	3.1	}
289
290
291	schorsch	3.10	static void
292			puta( /* put out ray in ASCII format */
293			FVECT ro,
294			FVECT rd
295			)
296	gregl	3.1	{
297			printf("%.5e %.5e %.5e %.5e %.5e %.5e\n",
298			ro[0], ro[1], ro[2],
299			rd[0], rd[1], rd[2]);
300			}
301
302
303	schorsch	3.10	static void
304			putf( /* put out ray in float format */
305			FVECT ro,
306			FVECT rd
307			)
308	gregl	3.1	{
309			float v[6];
310
311			v[0] = ro[0]; v[1] = ro[1]; v[2] = ro[2];
312			v[3] = rd[0]; v[4] = rd[1]; v[5] = rd[2];
313	greg	3.18	putbinary(v, sizeof(float), 6, stdout);
314	gregl	3.1	}
315
316
317	schorsch	3.10	static void
318			putd( /* put out ray in double format */
319			FVECT ro,
320			FVECT rd
321			)
322	gregl	3.1	{
323			double v[6];
324
325			v[0] = ro[0]; v[1] = ro[1]; v[2] = ro[2];
326			v[3] = rd[0]; v[4] = rd[1]; v[5] = rd[2];
327	greg	3.18	putbinary(v, sizeof(double), 6, stdout);
328	gregl	3.1	}