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root/radiance/ray/src/ot/wfconv.c
Revision: 2.8
Committed: Sat Mar 27 12:41:45 2004 UTC (20 years ago) by schorsch
Content type: text/plain
Branch: MAIN
Changes since 2.7: +50 -35 lines
Log Message:
Continued ANSIfication. Renamed local initotypes() to ot_initotypes().

File Contents

# Content
1 #ifndef lint
2 static const char RCSid[] = "$Id: wfconv.c,v 2.7 2004/01/29 22:21:34 greg Exp $";
3 #endif
4 /*
5 * Load Wavefront .OBJ file and convert to triangles with mesh info.
6 * Code borrowed largely from obj2rad.c
7 */
8
9 #include "copyright.h"
10 #include "standard.h"
11 #include "cvmesh.h"
12 #include <ctype.h>
13
14 typedef int VNDX[3]; /* vertex index (point,map,normal) */
15
16 #define CHUNKSIZ 1024 /* vertex allocation chunk size */
17
18 #define MAXARG 64 /* maximum # arguments in a statement */
19
20 static FVECT *vlist; /* our vertex list */
21 static int nvs; /* number of vertices in our list */
22 static FVECT *vnlist; /* vertex normal list */
23 static int nvns;
24 static RREAL (*vtlist)[2]; /* map vertex list */
25 static int nvts;
26
27 static char *inpfile; /* input file name */
28 static int havemats; /* materials available? */
29 static char material[64]; /* current material name */
30 static char group[64]; /* current group name */
31 static int lineno; /* current line number */
32 static int faceno; /* current face number */
33
34 static int getstmt(char *av[MAXARG], FILE *fp);
35 static int cvtndx(VNDX vi, char *vs);
36 static int putface(int ac, char **av);
37 static OBJECT getmod(void);
38 static int puttri(char *v1, char *v2, char *v3);
39 static void freeverts(void);
40 static int newv(double x, double y, double z);
41 static int newvn(double x, double y, double z);
42 static int newvt(double x, double y);
43 static void syntax(char *er);
44
45
46 void
47 wfreadobj( /* read in .OBJ file and convert */
48 char *objfn
49 )
50 {
51 FILE *fp;
52 char *argv[MAXARG];
53 int argc;
54 int nstats, nunknown;
55
56 if (objfn == NULL) {
57 inpfile = "<stdin>";
58 fp = stdin;
59 } else if ((fp = fopen(inpfile=objfn, "r")) == NULL) {
60 sprintf(errmsg, "cannot open \"%s\"", inpfile);
61 error(USER, errmsg);
62 }
63 havemats = (nobjects > 0);
64 nstats = nunknown = 0;
65 material[0] = '\0';
66 group[0] = '\0';
67 lineno = 0; faceno = 0;
68 /* scan until EOF */
69 while ( (argc = getstmt(argv, fp)) ) {
70 switch (argv[0][0]) {
71 case 'v': /* vertex */
72 switch (argv[0][1]) {
73 case '\0': /* point */
74 if (badarg(argc-1,argv+1,"fff"))
75 syntax("bad vertex");
76 newv(atof(argv[1]), atof(argv[2]),
77 atof(argv[3]));
78 break;
79 case 'n': /* normal */
80 if (argv[0][2])
81 goto unknown;
82 if (badarg(argc-1,argv+1,"fff"))
83 syntax("bad normal");
84 if (!newvn(atof(argv[1]), atof(argv[2]),
85 atof(argv[3])))
86 syntax("zero normal");
87 break;
88 case 't': /* coordinate */
89 if (argv[0][2])
90 goto unknown;
91 if (badarg(argc-1,argv+1,"ff"))
92 goto unknown;
93 newvt(atof(argv[1]), atof(argv[2]));
94 break;
95 default:
96 goto unknown;
97 }
98 break;
99 case 'f': /* face */
100 if (argv[0][1])
101 goto unknown;
102 faceno++;
103 switch (argc-1) {
104 case 0: case 1: case 2:
105 syntax("too few vertices");
106 break;
107 case 3:
108 if (!puttri(argv[1], argv[2], argv[3]))
109 syntax("bad triangle");
110 break;
111 default:
112 if (!putface(argc-1, argv+1))
113 syntax("bad face");
114 break;
115 }
116 break;
117 case 'u': /* usemtl/usemap */
118 if (!strcmp(argv[0], "usemap"))
119 break;
120 if (strcmp(argv[0], "usemtl"))
121 goto unknown;
122 if (argc > 1)
123 strcpy(material, argv[1]);
124 else
125 material[0] = '\0';
126 break;
127 case 'o': /* object name */
128 if (argv[0][1])
129 goto unknown;
130 break;
131 case 'g': /* group name */
132 if (argv[0][1])
133 goto unknown;
134 if (argc > 1)
135 strcpy(group, argv[1]);
136 else
137 group[0] = '\0';
138 break;
139 case '#': /* comment */
140 break;
141 default:; /* something we don't deal with */
142 unknown:
143 nunknown++;
144 break;
145 }
146 nstats++;
147 }
148 /* clean up */
149 freeverts();
150 fclose(fp);
151 if (nunknown > 0) {
152 sprintf(errmsg, "%d of %d statements unrecognized",
153 nunknown, nstats);
154 error(WARNING, errmsg);
155 }
156 }
157
158
159 static int
160 getstmt( /* read the next statement from fp */
161 register char *av[MAXARG],
162 FILE *fp
163 )
164 {
165 static char sbuf[MAXARG*16];
166 register char *cp;
167 register int i;
168
169 do {
170 if (fgetline(cp=sbuf, sizeof(sbuf), fp) == NULL)
171 return(0);
172 i = 0;
173 for ( ; ; ) {
174 while (isspace(*cp) || *cp == '\\') {
175 if (*cp == '\n')
176 lineno++;
177 *cp++ = '\0';
178 }
179 if (!*cp || i >= MAXARG-1)
180 break;
181 av[i++] = cp;
182 while (*++cp && !isspace(*cp))
183 ;
184 }
185 av[i] = NULL;
186 lineno++;
187 } while (!i);
188
189 return(i);
190 }
191
192
193 static int
194 cvtndx( /* convert vertex string to index */
195 register VNDX vi,
196 register char *vs
197 )
198 {
199 /* get point */
200 vi[0] = atoi(vs);
201 if (vi[0] > 0) {
202 if (vi[0]-- > nvs)
203 return(0);
204 } else if (vi[0] < 0) {
205 vi[0] += nvs;
206 if (vi[0] < 0)
207 return(0);
208 } else
209 return(0);
210 /* get map coord. */
211 while (*vs)
212 if (*vs++ == '/')
213 break;
214 vi[1] = atoi(vs);
215 if (vi[1] > 0) {
216 if (vi[1]-- > nvts)
217 return(0);
218 } else if (vi[1] < 0) {
219 vi[1] += nvts;
220 if (vi[1] < 0)
221 return(0);
222 } else
223 vi[1] = -1;
224 /* get normal */
225 while (*vs)
226 if (*vs++ == '/')
227 break;
228 vi[2] = atoi(vs);
229 if (vi[2] > 0) {
230 if (vi[2]-- > nvns)
231 return(0);
232 } else if (vi[2] < 0) {
233 vi[2] += nvns;
234 if (vi[2] < 0)
235 return(0);
236 } else
237 vi[2] = -1;
238 return(1);
239 }
240
241
242 static int
243 putface( /* put out an N-sided polygon */
244 int ac,
245 register char **av
246 )
247 {
248 char *cp;
249 register int i;
250
251 while (ac > 3) { /* break into triangles */
252 if (!puttri(av[0], av[1], av[2]))
253 return(0);
254 ac--; /* remove vertex & rotate */
255 cp = av[0];
256 for (i = 0; i < ac-1; i++)
257 av[i] = av[i+2];
258 av[i] = cp;
259 }
260 return(puttri(av[0], av[1], av[2]));
261 }
262
263
264 static OBJECT
265 getmod(void) /* get current modifier ID */
266 {
267 char *mnam;
268 OBJECT mod;
269
270 if (!havemats)
271 return(OVOID);
272 if (!strcmp(material, VOIDID))
273 return(OVOID);
274 if (material[0]) /* prefer usemtl statements */
275 mnam = material;
276 else if (group[0]) /* else use group name */
277 mnam = group;
278 else
279 return(OVOID);
280 mod = modifier(mnam);
281 if (mod == OVOID) {
282 sprintf(errmsg, "%s: undefined modifier \"%s\"",
283 inpfile, mnam);
284 error(USER, errmsg);
285 }
286 return(mod);
287 }
288
289
290 static int
291 puttri( /* convert a triangle */
292 char *v1,
293 char *v2,
294 char *v3
295 )
296 {
297 VNDX v1i, v2i, v3i;
298 RREAL *v1c, *v2c, *v3c;
299 RREAL *v1n, *v2n, *v3n;
300
301 if (!cvtndx(v1i, v1) || !cvtndx(v2i, v2) || !cvtndx(v3i, v3)) {
302 error(WARNING, "bad vertex reference");
303 return(0);
304 }
305 if (v1i[1]>=0 && v2i[1]>=0 && v3i[1]>=0) {
306 v1c = vtlist[v1i[1]];
307 v2c = vtlist[v2i[1]];
308 v3c = vtlist[v3i[1]];
309 } else
310 v1c = v2c = v3c = NULL;
311
312 if (v1i[2]>=0 && v2i[2]>=0 && v3i[2]>=0) {
313 v1n = vnlist[v1i[2]];
314 v2n = vnlist[v2i[2]];
315 v3n = vnlist[v3i[2]];
316 } else
317 v1n = v2n = v3n = NULL;
318
319 return(cvtri(getmod(), vlist[v1i[0]], vlist[v2i[0]], vlist[v3i[0]],
320 v1n, v2n, v3n, v1c, v2c, v3c) >= 0);
321 }
322
323
324 static void
325 freeverts(void) /* free all vertices */
326 {
327 if (nvs) {
328 free((void *)vlist);
329 nvs = 0;
330 }
331 if (nvts) {
332 free((void *)vtlist);
333 nvts = 0;
334 }
335 if (nvns) {
336 free((void *)vnlist);
337 nvns = 0;
338 }
339 }
340
341
342 static int
343 newv( /* create a new vertex */
344 double x,
345 double y,
346 double z
347 )
348 {
349 if (!(nvs%CHUNKSIZ)) { /* allocate next block */
350 if (nvs == 0)
351 vlist = (FVECT *)malloc(CHUNKSIZ*sizeof(FVECT));
352 else
353 vlist = (FVECT *)realloc((void *)vlist,
354 (nvs+CHUNKSIZ)*sizeof(FVECT));
355 if (vlist == NULL)
356 error(SYSTEM, "out of memory in newv");
357 }
358 /* assign new vertex */
359 vlist[nvs][0] = x;
360 vlist[nvs][1] = y;
361 vlist[nvs][2] = z;
362 return(++nvs);
363 }
364
365
366 static int
367 newvn( /* create a new vertex normal */
368 double x,
369 double y,
370 double z
371 )
372 {
373 if (!(nvns%CHUNKSIZ)) { /* allocate next block */
374 if (nvns == 0)
375 vnlist = (FVECT *)malloc(CHUNKSIZ*sizeof(FVECT));
376 else
377 vnlist = (FVECT *)realloc((void *)vnlist,
378 (nvns+CHUNKSIZ)*sizeof(FVECT));
379 if (vnlist == NULL)
380 error(SYSTEM, "out of memory in newvn");
381 }
382 /* assign new normal */
383 vnlist[nvns][0] = x;
384 vnlist[nvns][1] = y;
385 vnlist[nvns][2] = z;
386 if (normalize(vnlist[nvns]) == 0.0)
387 return(0);
388 return(++nvns);
389 }
390
391
392 static int
393 newvt( /* create a new texture map vertex */
394 double x,
395 double y
396 )
397 {
398 if (!(nvts%CHUNKSIZ)) { /* allocate next block */
399 if (nvts == 0)
400 vtlist = (RREAL (*)[2])malloc(CHUNKSIZ*2*sizeof(RREAL));
401 else
402 vtlist = (RREAL (*)[2])realloc((void *)vtlist,
403 (nvts+CHUNKSIZ)*2*sizeof(RREAL));
404 if (vtlist == NULL)
405 error(SYSTEM, "out of memory in newvt");
406 }
407 /* assign new vertex */
408 vtlist[nvts][0] = x;
409 vtlist[nvts][1] = y;
410 return(++nvts);
411 }
412
413
414 static void
415 syntax( /* report syntax error and exit */
416 char *er
417 )
418 {
419 sprintf(errmsg, "%s: Wavefront syntax error near line %d: %s\n",
420 inpfile, lineno, er);
421 error(USER, errmsg);
422 }