1 |
greg |
2.1 |
#ifndef lint |
2 |
|
|
static const char RCSid[] = "$Id$"; |
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 |
|
|
FVECT *vlist; /* our vertex list */ |
15 |
|
|
int nvs; /* number of vertices in our list */ |
16 |
|
|
FVECT *vnlist; /* vertex normal list */ |
17 |
|
|
int nvns; |
18 |
|
|
FLOAT (*vtlist)[2]; /* map vertex list */ |
19 |
|
|
int nvts; |
20 |
|
|
|
21 |
|
|
typedef int VNDX[3]; /* vertex index (point,map,normal) */ |
22 |
|
|
|
23 |
|
|
#define CHUNKSIZ 1024 /* vertex allocation chunk size */ |
24 |
|
|
|
25 |
|
|
#define MAXARG 64 /* maximum # arguments in a statement */ |
26 |
|
|
|
27 |
|
|
char *inpfile; /* input file name */ |
28 |
|
|
int lineno; /* current line number */ |
29 |
|
|
int faceno; /* current face number */ |
30 |
|
|
|
31 |
|
|
|
32 |
|
|
wfreadobj(objfn) /* read in .OBJ file and convert */ |
33 |
|
|
char *objfn; |
34 |
|
|
{ |
35 |
|
|
FILE *fp; |
36 |
|
|
char *argv[MAXARG]; |
37 |
|
|
int argc; |
38 |
|
|
int nstats, nunknown; |
39 |
|
|
int i; |
40 |
|
|
|
41 |
|
|
if (objfn == NULL) { |
42 |
|
|
inpfile = "<stdin>"; |
43 |
|
|
fp = stdin; |
44 |
|
|
} else if ((fp = fopen(inpfile=objfn, "r")) == NULL) { |
45 |
|
|
sprintf(errmsg, "cannot open \"%s\"", inpfile); |
46 |
|
|
error(USER, errmsg); |
47 |
|
|
} |
48 |
|
|
nstats = nunknown = 0; |
49 |
|
|
lineno = 0; faceno = 0; |
50 |
|
|
/* scan until EOF */ |
51 |
|
|
while (argc = getstmt(argv, fp)) { |
52 |
|
|
switch (argv[0][0]) { |
53 |
|
|
case 'v': /* vertex */ |
54 |
|
|
switch (argv[0][1]) { |
55 |
|
|
case '\0': /* point */ |
56 |
|
|
if (badarg(argc-1,argv+1,"fff")) |
57 |
greg |
2.2 |
syntax("bad vertex"); |
58 |
greg |
2.1 |
newv(atof(argv[1]), atof(argv[2]), |
59 |
|
|
atof(argv[3])); |
60 |
|
|
break; |
61 |
|
|
case 'n': /* normal */ |
62 |
|
|
if (argv[0][2]) |
63 |
|
|
goto unknown; |
64 |
|
|
if (badarg(argc-1,argv+1,"fff")) |
65 |
greg |
2.2 |
syntax("bad normal"); |
66 |
greg |
2.1 |
if (!newvn(atof(argv[1]), atof(argv[2]), |
67 |
|
|
atof(argv[3]))) |
68 |
greg |
2.2 |
syntax("zero normal"); |
69 |
greg |
2.1 |
break; |
70 |
greg |
2.2 |
case 't': /* coordinate */ |
71 |
greg |
2.1 |
if (argv[0][2]) |
72 |
|
|
goto unknown; |
73 |
|
|
if (badarg(argc-1,argv+1,"ff")) |
74 |
|
|
goto unknown; |
75 |
|
|
newvt(atof(argv[1]), atof(argv[2])); |
76 |
|
|
break; |
77 |
|
|
default: |
78 |
|
|
goto unknown; |
79 |
|
|
} |
80 |
|
|
break; |
81 |
|
|
case 'f': /* face */ |
82 |
|
|
if (argv[0][1]) |
83 |
|
|
goto unknown; |
84 |
|
|
faceno++; |
85 |
|
|
switch (argc-1) { |
86 |
|
|
case 0: case 1: case 2: |
87 |
greg |
2.2 |
syntax("too few vertices"); |
88 |
greg |
2.1 |
break; |
89 |
|
|
case 3: |
90 |
|
|
if (!puttri(argv[1], argv[2], argv[3])) |
91 |
greg |
2.2 |
syntax("bad triangle"); |
92 |
greg |
2.1 |
break; |
93 |
|
|
default: |
94 |
|
|
if (!putface(argc-1, argv+1)) |
95 |
greg |
2.2 |
syntax("bad face"); |
96 |
greg |
2.1 |
break; |
97 |
|
|
} |
98 |
|
|
break; |
99 |
|
|
case 'u': |
100 |
|
|
if (strcmp(argv[0], "usemtl") && |
101 |
|
|
strcmp(argv[0], "usemap")) |
102 |
|
|
goto unknown; |
103 |
|
|
break; |
104 |
|
|
case 'o': /* object name */ |
105 |
|
|
if (argv[0][1]) |
106 |
|
|
goto unknown; |
107 |
|
|
break; |
108 |
|
|
case 'g': /* group name(s) */ |
109 |
|
|
if (argv[0][1]) |
110 |
|
|
goto unknown; |
111 |
|
|
break; |
112 |
|
|
case '#': /* comment */ |
113 |
|
|
break; |
114 |
|
|
default:; /* something we don't deal with */ |
115 |
|
|
unknown: |
116 |
|
|
nunknown++; |
117 |
|
|
break; |
118 |
|
|
} |
119 |
|
|
nstats++; |
120 |
|
|
} |
121 |
|
|
/* clean up */ |
122 |
|
|
freeverts(); |
123 |
|
|
fclose(fp); |
124 |
|
|
if (nunknown > 0) { |
125 |
|
|
sprintf(errmsg, "%d of %d statements unrecognized", |
126 |
|
|
nunknown, nstats); |
127 |
|
|
error(WARNING, errmsg); |
128 |
|
|
} |
129 |
|
|
} |
130 |
|
|
|
131 |
|
|
|
132 |
|
|
int |
133 |
|
|
getstmt(av, fp) /* read the next statement from fp */ |
134 |
|
|
register char *av[MAXARG]; |
135 |
|
|
FILE *fp; |
136 |
|
|
{ |
137 |
|
|
static char sbuf[MAXARG*10]; |
138 |
|
|
register char *cp; |
139 |
|
|
register int i; |
140 |
|
|
|
141 |
|
|
do { |
142 |
|
|
if (fgetline(cp=sbuf, sizeof(sbuf), fp) == NULL) |
143 |
|
|
return(0); |
144 |
|
|
i = 0; |
145 |
|
|
for ( ; ; ) { |
146 |
|
|
while (isspace(*cp) || *cp == '\\') { |
147 |
|
|
if (*cp == '\n') |
148 |
|
|
lineno++; |
149 |
|
|
*cp++ = '\0'; |
150 |
|
|
} |
151 |
|
|
if (!*cp || i >= MAXARG-1) |
152 |
|
|
break; |
153 |
|
|
av[i++] = cp; |
154 |
|
|
while (*++cp && !isspace(*cp)) |
155 |
|
|
; |
156 |
|
|
} |
157 |
|
|
av[i] = NULL; |
158 |
|
|
lineno++; |
159 |
|
|
} while (!i); |
160 |
|
|
|
161 |
|
|
return(i); |
162 |
|
|
} |
163 |
|
|
|
164 |
|
|
|
165 |
|
|
cvtndx(vi, vs) /* convert vertex string to index */ |
166 |
|
|
register VNDX vi; |
167 |
|
|
register char *vs; |
168 |
|
|
{ |
169 |
|
|
/* get point */ |
170 |
|
|
vi[0] = atoi(vs); |
171 |
|
|
if (vi[0] > 0) { |
172 |
|
|
if (vi[0]-- > nvs) |
173 |
|
|
return(0); |
174 |
|
|
} else if (vi[0] < 0) { |
175 |
|
|
vi[0] += nvs; |
176 |
|
|
if (vi[0] < 0) |
177 |
|
|
return(0); |
178 |
|
|
} else |
179 |
|
|
return(0); |
180 |
|
|
/* get map coord. */ |
181 |
|
|
while (*vs) |
182 |
|
|
if (*vs++ == '/') |
183 |
|
|
break; |
184 |
|
|
vi[1] = atoi(vs); |
185 |
|
|
if (vi[1] > 0) { |
186 |
|
|
if (vi[1]-- > nvts) |
187 |
|
|
return(0); |
188 |
|
|
} else if (vi[1] < 0) { |
189 |
|
|
vi[1] += nvts; |
190 |
|
|
if (vi[1] < 0) |
191 |
|
|
return(0); |
192 |
|
|
} else |
193 |
|
|
vi[1] = -1; |
194 |
|
|
/* get normal */ |
195 |
|
|
while (*vs) |
196 |
|
|
if (*vs++ == '/') |
197 |
|
|
break; |
198 |
|
|
vi[2] = atoi(vs); |
199 |
|
|
if (vi[2] > 0) { |
200 |
|
|
if (vi[2]-- > nvns) |
201 |
|
|
return(0); |
202 |
|
|
} else if (vi[2] < 0) { |
203 |
|
|
vi[2] += nvns; |
204 |
|
|
if (vi[2] < 0) |
205 |
|
|
return(0); |
206 |
|
|
} else |
207 |
|
|
vi[2] = -1; |
208 |
|
|
return(1); |
209 |
|
|
} |
210 |
|
|
|
211 |
|
|
|
212 |
|
|
putface(ac, av) /* put out an N-sided polygon */ |
213 |
|
|
int ac; |
214 |
|
|
register char **av; |
215 |
|
|
{ |
216 |
|
|
char *cp; |
217 |
|
|
register int i; |
218 |
|
|
|
219 |
|
|
while (ac > 3) { /* break into triangles */ |
220 |
|
|
if (!puttri(av[0], av[1], av[2])) |
221 |
|
|
return(0); |
222 |
|
|
ac--; /* remove vertex & rotate */ |
223 |
|
|
cp = av[0]; |
224 |
|
|
for (i = 0; i < ac-1; i++) |
225 |
|
|
av[i] = av[i+2]; |
226 |
|
|
av[i] = cp; |
227 |
|
|
} |
228 |
|
|
return(puttri(av[0], av[1], av[2])); |
229 |
|
|
} |
230 |
|
|
|
231 |
|
|
|
232 |
|
|
puttri(v1, v2, v3) /* convert a triangle */ |
233 |
|
|
char *v1, *v2, *v3; |
234 |
|
|
{ |
235 |
|
|
VNDX v1i, v2i, v3i; |
236 |
|
|
FLOAT *v1c, *v2c, *v3c; |
237 |
|
|
FLOAT *v1n, *v2n, *v3n; |
238 |
greg |
2.2 |
|
239 |
greg |
2.1 |
if (!cvtndx(v1i, v1) || !cvtndx(v2i, v2) || !cvtndx(v3i, v3)) |
240 |
|
|
return(0); |
241 |
|
|
|
242 |
|
|
if (v1i[1]>=0 && v2i[1]>=0 && v3i[1]>=0) { |
243 |
|
|
v1c = vtlist[v1i[1]]; |
244 |
|
|
v2c = vtlist[v2i[1]]; |
245 |
|
|
v3c = vtlist[v3i[1]]; |
246 |
|
|
} else |
247 |
|
|
v1c = v2c = v3c = NULL; |
248 |
|
|
|
249 |
|
|
if (v1i[2]>=0 && v2i[2]>=0 && v3i[2]>=0) { |
250 |
|
|
v1n = vnlist[v1i[2]]; |
251 |
|
|
v2n = vnlist[v2i[2]]; |
252 |
|
|
v3n = vnlist[v3i[2]]; |
253 |
|
|
} else |
254 |
|
|
v1n = v2n = v3n = NULL; |
255 |
|
|
|
256 |
|
|
return(cvtri(vlist[v1i[0]], vlist[v2i[0]], vlist[v3i[0]], |
257 |
|
|
v1n, v2n, v3n, v1c, v2c, v3c) >= 0); |
258 |
|
|
} |
259 |
|
|
|
260 |
|
|
|
261 |
|
|
freeverts() /* free all vertices */ |
262 |
|
|
{ |
263 |
|
|
if (nvs) { |
264 |
|
|
free((void *)vlist); |
265 |
|
|
nvs = 0; |
266 |
|
|
} |
267 |
|
|
if (nvts) { |
268 |
|
|
free((void *)vtlist); |
269 |
|
|
nvts = 0; |
270 |
|
|
} |
271 |
|
|
if (nvns) { |
272 |
|
|
free((void *)vnlist); |
273 |
|
|
nvns = 0; |
274 |
|
|
} |
275 |
|
|
} |
276 |
|
|
|
277 |
|
|
|
278 |
|
|
int |
279 |
|
|
newv(x, y, z) /* create a new vertex */ |
280 |
|
|
double x, y, z; |
281 |
|
|
{ |
282 |
|
|
if (!(nvs%CHUNKSIZ)) { /* allocate next block */ |
283 |
|
|
if (nvs == 0) |
284 |
|
|
vlist = (FVECT *)malloc(CHUNKSIZ*sizeof(FVECT)); |
285 |
|
|
else |
286 |
|
|
vlist = (FVECT *)realloc((char *)vlist, |
287 |
|
|
(nvs+CHUNKSIZ)*sizeof(FVECT)); |
288 |
greg |
2.2 |
if (vlist == NULL) |
289 |
|
|
error(SYSTEM, "out of memory in newv"); |
290 |
greg |
2.1 |
} |
291 |
|
|
/* assign new vertex */ |
292 |
|
|
vlist[nvs][0] = x; |
293 |
|
|
vlist[nvs][1] = y; |
294 |
|
|
vlist[nvs][2] = z; |
295 |
|
|
return(++nvs); |
296 |
|
|
} |
297 |
|
|
|
298 |
|
|
|
299 |
|
|
int |
300 |
|
|
newvn(x, y, z) /* create a new vertex normal */ |
301 |
|
|
double x, y, z; |
302 |
|
|
{ |
303 |
|
|
if (!(nvns%CHUNKSIZ)) { /* allocate next block */ |
304 |
|
|
if (nvns == 0) |
305 |
|
|
vnlist = (FVECT *)malloc(CHUNKSIZ*sizeof(FVECT)); |
306 |
|
|
else |
307 |
|
|
vnlist = (FVECT *)realloc((char *)vnlist, |
308 |
|
|
(nvns+CHUNKSIZ)*sizeof(FVECT)); |
309 |
greg |
2.2 |
if (vnlist == NULL) |
310 |
|
|
error(SYSTEM, "out of memory in newvn"); |
311 |
greg |
2.1 |
} |
312 |
|
|
/* assign new normal */ |
313 |
|
|
vnlist[nvns][0] = x; |
314 |
|
|
vnlist[nvns][1] = y; |
315 |
|
|
vnlist[nvns][2] = z; |
316 |
|
|
if (normalize(vnlist[nvns]) == 0.0) |
317 |
|
|
return(0); |
318 |
|
|
return(++nvns); |
319 |
|
|
} |
320 |
|
|
|
321 |
|
|
|
322 |
|
|
int |
323 |
|
|
newvt(x, y) /* create a new texture map vertex */ |
324 |
|
|
double x, y; |
325 |
|
|
{ |
326 |
|
|
if (!(nvts%CHUNKSIZ)) { /* allocate next block */ |
327 |
|
|
if (nvts == 0) |
328 |
|
|
vtlist = (FLOAT (*)[2])malloc(CHUNKSIZ*2*sizeof(FLOAT)); |
329 |
|
|
else |
330 |
|
|
vtlist = (FLOAT (*)[2])realloc((char *)vtlist, |
331 |
|
|
(nvts+CHUNKSIZ)*2*sizeof(FLOAT)); |
332 |
greg |
2.2 |
if (vtlist == NULL) |
333 |
|
|
error(SYSTEM, "out of memory in newvt"); |
334 |
greg |
2.1 |
} |
335 |
|
|
/* assign new vertex */ |
336 |
|
|
vtlist[nvts][0] = x; |
337 |
|
|
vtlist[nvts][1] = y; |
338 |
|
|
return(++nvts); |
339 |
|
|
} |
340 |
|
|
|
341 |
|
|
|
342 |
|
|
syntax(er) /* report syntax error and exit */ |
343 |
|
|
char *er; |
344 |
|
|
{ |
345 |
greg |
2.2 |
sprintf(errmsg, "%s: Wavefront syntax error near line %d: %s\n", |
346 |
greg |
2.1 |
inpfile, lineno, er); |
347 |
greg |
2.2 |
error(USER, errmsg); |
348 |
greg |
2.1 |
} |