src/util/vwrays.c

#ifndef lint
static const char       RCSid[] = "$Id: vwrays.c,v 3.11 2005/01/20 23:52:02 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;

char    *progname;


int
main(
        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 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;
                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);
}


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;
        register int    i;

        while (fscanf(fp, "%lf %lf", &px, &py) == 2) {
                px += .5; py += .5;
                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);
                }
                loc[0] = px/rs.xr; loc[1] = py/rs.yr;
                if (zfd >= 0) {
                        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 (!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;
        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);
                        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];
        fwrite(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];
        fwrite(v, sizeof(double), 6, stdout);
}
Revision:	3.12
Committed:	Mon Sep 19 04:26:09 2005 UTC (18 years, 7 months ago) by greg
Content type:	text/plain
Branch:	MAIN
Changes since 3.11:	+31 -7 lines
Log Message:	Added -pj option to vwrays for ray jittering
#	User	Rev	Content
1	gregl	3.1	#ifndef lint
2	greg	3.12	static const char RCSid[] = "$Id: vwrays.c,v 3.11 2005/01/20 23:52:02 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	gregl	3.1	char *progname;
35
36
37	schorsch	3.10	int
38			main(
39			int argc,
40			char *argv[]
41			)
42	gregl	3.1	{
43			char *err;
44			int rval, getdim = 0;
45			register int i;
46
47			progname = argv[0];
48			if (argc < 2)
49			goto userr;
50			for (i = 1; i < argc && argv[i][0] == '-'; i++)
51			switch (argv[i][1]) {
52			case 'f': /* output format */
53			switch (argv[i][2]) {
54			case 'a': /* ASCII */
55			putr = puta;
56			break;
57			case 'f': /* float */
58			putr = putf;
59			break;
60			case 'd': /* double */
61			putr = putd;
62			break;
63			default:
64			goto userr;
65			}
66			break;
67			case 'v': /* view file or option */
68			if (argv[i][2] == 'f') {
69			rval = viewfile(argv[++i], &vw, NULL);
70			if (rval <= 0) {
71			fprintf(stderr,
72			"%s: no view in file\n",
73			argv[i]);
74			exit(1);
75			}
76			break;
77			}
78			rval = getviewopt(&vw, argc-i, argv+i);
79			if (rval < 0)
80			goto userr;
81			i += rval;
82			break;
83			case 'd': /* report dimensions only */
84			getdim++;
85			break;
86			case 'x': /* x resolution */
87			rs.xr = atoi(argv[++i]);
88			if (rs.xr <= 0) {
89			fprintf(stderr, "%s: bad x resolution\n",
90			progname);
91			exit(1);
92			}
93			break;
94			case 'y': /* y resolution */
95			rs.yr = atoi(argv[++i]);
96			if (rs.yr <= 0) {
97			fprintf(stderr, "%s: bad y resolution\n",
98			progname);
99			exit(1);
100			}
101			break;
102	greg	3.12	case 'p': /* pixel aspect or jitter */
103			if (argv[i][2] == 'a')
104			pa = atof(argv[++i]);
105			else if (argv[i][2] == 'j')
106			pj= atof(argv[++i]);
107			else
108			goto userr;
109	gregl	3.1	break;
110	greg	3.4	case 'i': /* get pixels from stdin */
111			fromstdin = 1;
112			break;
113	gregl	3.1	default:
114			goto userr;
115			}
116	schorsch	3.7	if ((i > argc) \| (i+2 < argc))
117	gregl	3.1	goto userr;
118			if (i < argc) {
119			rval = viewfile(argv[i], &vw, &rs);
120			if (rval <= 0) {
121			fprintf(stderr, "%s: no view in picture\n", argv[i]);
122			exit(1);
123			}
124			if (i+1 < argc) {
125			zfd = open(argv[i+1], O_RDONLY);
126			if (zfd < 0) {
127			fprintf(stderr,
128			"%s: cannot open depth buffer\n",
129			argv[i+1]);
130			exit(1);
131			}
132			}
133			}
134			if ((err = setview(&vw)) != NULL) {
135			fprintf(stderr, "%s: %s\n", progname, err);
136			exit(1);
137			}
138			if (i == argc)
139			normaspect(viewaspect(&vw), &pa, &rs.xr, &rs.yr);
140			if (getdim) {
141	gregl	3.3	printf("-x %d -y %d -ld%c\n", rs.xr, rs.yr,
142			vw.vaft > FTINY ? '+' : '-');
143	gregl	3.1	exit(0);
144			}
145	greg	3.4	if (fromstdin)
146			pix2rays(stdin);
147			else
148			putrays();
149	gregl	3.1	exit(0);
150			userr:
151			fprintf(stderr,
152	greg	3.4	"Usage: %s [ -i -f{a\|f\|d} \| -d ] { view opts .. \| picture [zbuf] }\n",
153	gregl	3.1	progname);
154			exit(1);
155			}
156
157
158	schorsch	3.10	static void
159	greg	3.12	jitterloc(
160			RREAL loc[2]
161			)
162			{
163			if (pj > FTINY) {
164			loc[0] += pj*(.5 - frandom())/rs.xr;
165			loc[1] += pj*(.5 - frandom())/rs.yr;
166			}
167			}
168
169
170			static void
171	schorsch	3.10	pix2rays(
172			FILE *fp
173			)
174	greg	3.4	{
175			static FVECT rorg, rdir;
176			float zval;
177			double px, py;
178	greg	3.12	RREAL loc[2];
179	greg	3.4	int pp[2];
180			double d;
181			register int i;
182
183			while (fscanf(fp, "%lf %lf", &px, &py) == 2) {
184	greg	3.11	px += .5; py += .5;
185	greg	3.4	if (px < 0 \|\| px >= rs.xr \|\|
186			py < 0 \|\| py >= rs.yr) {
187			fprintf(stderr,
188			"%s: (x,y) pair (%.0f,%.0f) out of range\n",
189			progname, px, py);
190			exit(1);
191			}
192	greg	3.12	loc[0] = px/rs.xr; loc[1] = py/rs.yr;
193	greg	3.4	if (zfd >= 0) {
194	greg	3.12	loc2pix(pp, &rs, loc[0], loc[1]);
195	greg	3.4	if (lseek(zfd,
196	greg	3.8	(pp[1]scanlen(&rs)+pp[0])sizeof(float),
197			SEEK_SET) < 0 \|\|
198	greg	3.4	read(zfd, &zval, sizeof(float))
199	greg	3.8	< sizeof(float)) {
200	greg	3.4	fprintf(stderr, "%s: depth buffer read error\n",
201			progname);
202			exit(1);
203			}
204			}
205	greg	3.12	jitterloc(loc);
206			d = viewray(rorg, rdir, &vw, loc[0], loc[1]);
207	greg	3.4	if (d < -FTINY)
208			rorg[0] = rorg[1] = rorg[2] =
209			rdir[0] = rdir[1] = rdir[2] = 0.;
210			else if (zfd >= 0)
211			for (i = 0; i < 3; i++) {
212			rorg[i] += rdir[i]*zval;
213			rdir[i] = -rdir[i];
214			}
215			else if (d > FTINY) {
216			rdir[0] = d; rdir[1] = d; rdir[2] *= d;
217			}
218			(*putr)(rorg, rdir);
219			}
220			if (!feof(fp)) {
221			fprintf(stderr, "%s: expected px py on input\n", progname);
222			exit(1);
223			}
224			}
225
226
227	schorsch	3.10	static void
228			putrays(void)
229	gregl	3.1	{
230	greg	3.12	RREAL loc[2];
231			FVECT rorg, rdir;
232	schorsch	3.10	float *zbuf = NULL;
233	gregl	3.1	int sc;
234	gregl	3.2	double d;
235	gregl	3.1	register int si, i;
236
237			if (zfd >= 0) {
238			zbuf = (float )malloc(scanlen(&rs)sizeof(float));
239			if (zbuf == NULL) {
240			fprintf(stderr, "%s: not enough memory\n", progname);
241			exit(1);
242			}
243			}
244			for (sc = 0; sc < numscans(&rs); sc++) {
245			if (zfd >= 0) {
246			if (read(zfd, zbuf, scanlen(&rs)*sizeof(float)) <
247			scanlen(&rs)*sizeof(float)) {
248			fprintf(stderr, "%s: depth buffer read error\n",
249			progname);
250			exit(1);
251			}
252			}
253			for (si = 0; si < scanlen(&rs); si++) {
254			pix2loc(loc, &rs, si, sc);
255	greg	3.12	jitterloc(loc);
256	gregl	3.2	d = viewray(rorg, rdir, &vw, loc[0], loc[1]);
257			if (d < -FTINY)
258	gregl	3.1	rorg[0] = rorg[1] = rorg[2] =
259			rdir[0] = rdir[1] = rdir[2] = 0.;
260			else if (zfd >= 0)
261			for (i = 0; i < 3; i++) {
262			rorg[i] += rdir[i]*zbuf[si];
263			rdir[i] = -rdir[i];
264			}
265	gregl	3.2	else if (d > FTINY) {
266			rdir[0] = d; rdir[1] = d; rdir[2] *= d;
267			}
268	gregl	3.1	(*putr)(rorg, rdir);
269			}
270			}
271			if (zfd >= 0)
272	greg	3.4	free((void *)zbuf);
273	gregl	3.1	}
274
275
276	schorsch	3.10	static void
277			puta( /* put out ray in ASCII format */
278			FVECT ro,
279			FVECT rd
280			)
281	gregl	3.1	{
282			printf("%.5e %.5e %.5e %.5e %.5e %.5e\n",
283			ro[0], ro[1], ro[2],
284			rd[0], rd[1], rd[2]);
285			}
286
287
288	schorsch	3.10	static void
289			putf( /* put out ray in float format */
290			FVECT ro,
291			FVECT rd
292			)
293	gregl	3.1	{
294			float v[6];
295
296			v[0] = ro[0]; v[1] = ro[1]; v[2] = ro[2];
297			v[3] = rd[0]; v[4] = rd[1]; v[5] = rd[2];
298			fwrite(v, sizeof(float), 6, stdout);
299			}
300
301
302	schorsch	3.10	static void
303			putd( /* put out ray in double format */
304			FVECT ro,
305			FVECT rd
306			)
307	gregl	3.1	{
308			double v[6];
309
310			v[0] = ro[0]; v[1] = ro[1]; v[2] = ro[2];
311			v[3] = rd[0]; v[4] = rd[1]; v[5] = rd[2];
312			fwrite(v, sizeof(double), 6, stdout);
313			}