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root/radiance/ray/src/util/vwrays.c
Revision: 3.10
Committed: Fri Mar 26 23:34:23 2004 UTC (20 years, 8 months ago) by schorsch
Content type: text/plain
Branch: MAIN
CVS Tags: rad3R6, rad3R6P1
Changes since 3.9: +35 -15 lines
Log Message:
Continued ANSIfication.

File Contents

# User Rev Content
1 gregl 3.1 #ifndef lint
2 schorsch 3.10 static const char RCSid[] = "$Id: vwrays.c,v 3.9 2003/10/22 02:06:35 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 schorsch 3.10 typedef void putfunc(FVECT ro, FVECT rd);
13     static putfunc puta;
14     static putfunc putf;
15     static putfunc putd;
16     static void pix2rays(FILE *fp);
17     static void putrays(void);
18 gregl 3.1
19 schorsch 3.10 static putfunc *putr = puta;
20 gregl 3.1
21     VIEW vw = STDVIEW;
22    
23     RESOLU rs = {PIXSTANDARD, 512, 512};
24    
25     double pa = 1.;
26    
27     int zfd = -1;
28    
29 greg 3.4 int fromstdin = 0;
30    
31 gregl 3.1 char *progname;
32    
33    
34 schorsch 3.10 int
35     main(
36     int argc,
37     char *argv[]
38     )
39 gregl 3.1 {
40     char *err;
41     int rval, getdim = 0;
42     register int i;
43    
44     progname = argv[0];
45     if (argc < 2)
46     goto userr;
47     for (i = 1; i < argc && argv[i][0] == '-'; i++)
48     switch (argv[i][1]) {
49     case 'f': /* output format */
50     switch (argv[i][2]) {
51     case 'a': /* ASCII */
52     putr = puta;
53     break;
54     case 'f': /* float */
55     putr = putf;
56     break;
57     case 'd': /* double */
58     putr = putd;
59     break;
60     default:
61     goto userr;
62     }
63     break;
64     case 'v': /* view file or option */
65     if (argv[i][2] == 'f') {
66     rval = viewfile(argv[++i], &vw, NULL);
67     if (rval <= 0) {
68     fprintf(stderr,
69     "%s: no view in file\n",
70     argv[i]);
71     exit(1);
72     }
73     break;
74     }
75     rval = getviewopt(&vw, argc-i, argv+i);
76     if (rval < 0)
77     goto userr;
78     i += rval;
79     break;
80     case 'd': /* report dimensions only */
81     getdim++;
82     break;
83     case 'x': /* x resolution */
84     rs.xr = atoi(argv[++i]);
85     if (rs.xr <= 0) {
86     fprintf(stderr, "%s: bad x resolution\n",
87     progname);
88     exit(1);
89     }
90     break;
91     case 'y': /* y resolution */
92     rs.yr = atoi(argv[++i]);
93     if (rs.yr <= 0) {
94     fprintf(stderr, "%s: bad y resolution\n",
95     progname);
96     exit(1);
97     }
98     break;
99     case 'p': /* pixel aspect ratio */
100     pa = atof(argv[++i]);
101     break;
102 greg 3.4 case 'i': /* get pixels from stdin */
103     fromstdin = 1;
104     break;
105 gregl 3.1 default:
106     goto userr;
107     }
108 schorsch 3.7 if ((i > argc) | (i+2 < argc))
109 gregl 3.1 goto userr;
110     if (i < argc) {
111     rval = viewfile(argv[i], &vw, &rs);
112     if (rval <= 0) {
113     fprintf(stderr, "%s: no view in picture\n", argv[i]);
114     exit(1);
115     }
116     if (i+1 < argc) {
117     zfd = open(argv[i+1], O_RDONLY);
118     if (zfd < 0) {
119     fprintf(stderr,
120     "%s: cannot open depth buffer\n",
121     argv[i+1]);
122     exit(1);
123     }
124     }
125     }
126     if ((err = setview(&vw)) != NULL) {
127     fprintf(stderr, "%s: %s\n", progname, err);
128     exit(1);
129     }
130     if (i == argc)
131     normaspect(viewaspect(&vw), &pa, &rs.xr, &rs.yr);
132     if (getdim) {
133 gregl 3.3 printf("-x %d -y %d -ld%c\n", rs.xr, rs.yr,
134     vw.vaft > FTINY ? '+' : '-');
135 gregl 3.1 exit(0);
136     }
137 greg 3.4 if (fromstdin)
138     pix2rays(stdin);
139     else
140     putrays();
141 gregl 3.1 exit(0);
142     userr:
143     fprintf(stderr,
144 greg 3.4 "Usage: %s [ -i -f{a|f|d} | -d ] { view opts .. | picture [zbuf] }\n",
145 gregl 3.1 progname);
146     exit(1);
147     }
148    
149    
150 schorsch 3.10 static void
151     pix2rays(
152     FILE *fp
153     )
154 greg 3.4 {
155     static FVECT rorg, rdir;
156     float zval;
157     double px, py;
158     int pp[2];
159     double d;
160     register int i;
161    
162     while (fscanf(fp, "%lf %lf", &px, &py) == 2) {
163     if (px < 0 || px >= rs.xr ||
164     py < 0 || py >= rs.yr) {
165     fprintf(stderr,
166     "%s: (x,y) pair (%.0f,%.0f) out of range\n",
167     progname, px, py);
168     exit(1);
169     }
170     if (zfd >= 0) {
171     loc2pix(pp, &rs, px/rs.xr, py/rs.yr);
172     if (lseek(zfd,
173 greg 3.8 (pp[1]*scanlen(&rs)+pp[0])*sizeof(float),
174     SEEK_SET) < 0 ||
175 greg 3.4 read(zfd, &zval, sizeof(float))
176 greg 3.8 < sizeof(float)) {
177 greg 3.4 fprintf(stderr, "%s: depth buffer read error\n",
178     progname);
179     exit(1);
180     }
181     }
182     d = viewray(rorg, rdir, &vw, px/rs.xr, py/rs.yr);
183     if (d < -FTINY)
184     rorg[0] = rorg[1] = rorg[2] =
185     rdir[0] = rdir[1] = rdir[2] = 0.;
186     else if (zfd >= 0)
187     for (i = 0; i < 3; i++) {
188     rorg[i] += rdir[i]*zval;
189     rdir[i] = -rdir[i];
190     }
191     else if (d > FTINY) {
192     rdir[0] *= d; rdir[1] *= d; rdir[2] *= d;
193     }
194     (*putr)(rorg, rdir);
195     }
196     if (!feof(fp)) {
197     fprintf(stderr, "%s: expected px py on input\n", progname);
198     exit(1);
199     }
200     }
201    
202    
203 schorsch 3.10 static void
204     putrays(void)
205 gregl 3.1 {
206 schorsch 3.5 static RREAL loc[2];
207 gregl 3.2 static FVECT rorg, rdir;
208 schorsch 3.10 float *zbuf = NULL;
209 gregl 3.1 int sc;
210 gregl 3.2 double d;
211 gregl 3.1 register int si, i;
212    
213     if (zfd >= 0) {
214     zbuf = (float *)malloc(scanlen(&rs)*sizeof(float));
215     if (zbuf == NULL) {
216     fprintf(stderr, "%s: not enough memory\n", progname);
217     exit(1);
218     }
219     }
220     for (sc = 0; sc < numscans(&rs); sc++) {
221     if (zfd >= 0) {
222     if (read(zfd, zbuf, scanlen(&rs)*sizeof(float)) <
223     scanlen(&rs)*sizeof(float)) {
224     fprintf(stderr, "%s: depth buffer read error\n",
225     progname);
226     exit(1);
227     }
228     }
229     for (si = 0; si < scanlen(&rs); si++) {
230     pix2loc(loc, &rs, si, sc);
231 gregl 3.2 d = viewray(rorg, rdir, &vw, loc[0], loc[1]);
232     if (d < -FTINY)
233 gregl 3.1 rorg[0] = rorg[1] = rorg[2] =
234     rdir[0] = rdir[1] = rdir[2] = 0.;
235     else if (zfd >= 0)
236     for (i = 0; i < 3; i++) {
237     rorg[i] += rdir[i]*zbuf[si];
238     rdir[i] = -rdir[i];
239     }
240 gregl 3.2 else if (d > FTINY) {
241     rdir[0] *= d; rdir[1] *= d; rdir[2] *= d;
242     }
243 gregl 3.1 (*putr)(rorg, rdir);
244     }
245     }
246     if (zfd >= 0)
247 greg 3.4 free((void *)zbuf);
248 gregl 3.1 }
249    
250    
251 schorsch 3.10 static void
252     puta( /* put out ray in ASCII format */
253     FVECT ro,
254     FVECT rd
255     )
256 gregl 3.1 {
257     printf("%.5e %.5e %.5e %.5e %.5e %.5e\n",
258     ro[0], ro[1], ro[2],
259     rd[0], rd[1], rd[2]);
260     }
261    
262    
263 schorsch 3.10 static void
264     putf( /* put out ray in float format */
265     FVECT ro,
266     FVECT rd
267     )
268 gregl 3.1 {
269     float v[6];
270    
271     v[0] = ro[0]; v[1] = ro[1]; v[2] = ro[2];
272     v[3] = rd[0]; v[4] = rd[1]; v[5] = rd[2];
273     fwrite(v, sizeof(float), 6, stdout);
274     }
275    
276    
277 schorsch 3.10 static void
278     putd( /* put out ray in double format */
279     FVECT ro,
280     FVECT rd
281     )
282 gregl 3.1 {
283     double v[6];
284    
285     v[0] = ro[0]; v[1] = ro[1]; v[2] = ro[2];
286     v[3] = rd[0]; v[4] = rd[1]; v[5] = rd[2];
287     fwrite(v, sizeof(double), 6, stdout);
288     }