1 |
#ifndef lint |
2 |
static const char RCSid[] = "$Id: readmesh.c,v 2.5 2003/06/08 12:03:09 schorsch Exp $"; |
3 |
#endif |
4 |
/* |
5 |
* Routines for reading a compiled mesh from a file |
6 |
*/ |
7 |
|
8 |
#include "standard.h" |
9 |
#include "platform.h" |
10 |
#include "octree.h" |
11 |
#include "object.h" |
12 |
#include "mesh.h" |
13 |
#include "resolu.h" |
14 |
|
15 |
static char *meshfn; /* input file name */ |
16 |
static FILE *meshfp; /* mesh file pointer */ |
17 |
static int objsize; /* sizeof(OBJECT) from writer */ |
18 |
|
19 |
|
20 |
static void |
21 |
mesherror(etyp, msg) /* mesh read error */ |
22 |
int etyp; |
23 |
char *msg; |
24 |
{ |
25 |
char msgbuf[128]; |
26 |
|
27 |
sprintf(msgbuf, "(%s): %s", meshfn, msg); |
28 |
error(etyp, msgbuf); |
29 |
} |
30 |
|
31 |
|
32 |
static long |
33 |
mgetint(siz) /* get a siz-byte integer */ |
34 |
int siz; |
35 |
{ |
36 |
register long r; |
37 |
|
38 |
r = getint(siz, meshfp); |
39 |
if (feof(meshfp)) |
40 |
mesherror(USER, "truncated mesh file"); |
41 |
return(r); |
42 |
} |
43 |
|
44 |
|
45 |
static double |
46 |
mgetflt() /* get a floating point number */ |
47 |
{ |
48 |
double r; |
49 |
|
50 |
r = getflt(meshfp); |
51 |
if (feof(meshfp)) |
52 |
mesherror(USER, "truncated mesh file"); |
53 |
return(r); |
54 |
} |
55 |
|
56 |
|
57 |
static OCTREE |
58 |
getfullnode() /* get a set, return fullnode */ |
59 |
{ |
60 |
OBJECT set[MAXSET+1]; |
61 |
register int i; |
62 |
|
63 |
if ((set[0] = mgetint(objsize)) > MAXSET) |
64 |
mesherror(USER, "bad set in getfullnode"); |
65 |
for (i = 1; i <= set[0]; i++) |
66 |
set[i] = mgetint(objsize); |
67 |
return(fullnode(set)); |
68 |
} |
69 |
|
70 |
|
71 |
static OCTREE |
72 |
gettree() /* get a pre-ordered octree */ |
73 |
{ |
74 |
register OCTREE ot; |
75 |
register int i; |
76 |
|
77 |
switch (getc(meshfp)) { |
78 |
case OT_EMPTY: |
79 |
return(EMPTY); |
80 |
case OT_FULL: |
81 |
return(getfullnode()); |
82 |
case OT_TREE: |
83 |
if ((ot = octalloc()) == EMPTY) |
84 |
mesherror(SYSTEM, "out of tree space in readmesh"); |
85 |
for (i = 0; i < 8; i++) |
86 |
octkid(ot, i) = gettree(); |
87 |
return(ot); |
88 |
case EOF: |
89 |
mesherror(USER, "truncated mesh octree"); |
90 |
default: |
91 |
mesherror(USER, "damaged mesh octree"); |
92 |
} |
93 |
return NULL; /* pro forma return */ |
94 |
} |
95 |
|
96 |
|
97 |
static void |
98 |
skiptree() /* skip octree on input */ |
99 |
{ |
100 |
register int i; |
101 |
|
102 |
switch (getc(meshfp)) { |
103 |
case OT_EMPTY: |
104 |
return; |
105 |
case OT_FULL: |
106 |
for (i = mgetint(objsize)*objsize; i-- > 0; ) |
107 |
if (getc(meshfp) == EOF) |
108 |
mesherror(USER, "truncated mesh octree"); |
109 |
return; |
110 |
case OT_TREE: |
111 |
for (i = 0; i < 8; i++) |
112 |
skiptree(); |
113 |
return; |
114 |
case EOF: |
115 |
mesherror(USER, "truncated mesh octree"); |
116 |
default: |
117 |
mesherror(USER, "damaged mesh octree"); |
118 |
} |
119 |
} |
120 |
|
121 |
|
122 |
static void |
123 |
getpatch(pp) /* load a mesh patch */ |
124 |
register MESHPATCH *pp; |
125 |
{ |
126 |
int flags; |
127 |
int i, j; |
128 |
/* vertex flags */ |
129 |
flags = mgetint(1); |
130 |
if (!(flags & MT_V) || flags & ~(MT_V|MT_N|MT_UV)) |
131 |
mesherror(USER, "bad patch flags"); |
132 |
/* allocate vertices */ |
133 |
pp->nverts = mgetint(2); |
134 |
if (pp->nverts <= 0 || pp->nverts > 256) |
135 |
mesherror(USER, "bad number of patch vertices"); |
136 |
pp->xyz = (uint32 (*)[3])malloc(pp->nverts*3*sizeof(uint32)); |
137 |
if (pp->xyz == NULL) |
138 |
goto nomem; |
139 |
if (flags & MT_N) { |
140 |
pp->norm = (int32 *)calloc(pp->nverts, sizeof(int32)); |
141 |
if (pp->norm == NULL) |
142 |
goto nomem; |
143 |
} else |
144 |
pp->norm = NULL; |
145 |
if (flags & MT_UV) { |
146 |
pp->uv = (uint32 (*)[2])calloc(pp->nverts, 2*sizeof(uint32)); |
147 |
if (pp->uv == NULL) |
148 |
goto nomem; |
149 |
} else |
150 |
pp->uv = NULL; |
151 |
/* vertex xyz locations */ |
152 |
for (i = 0; i < pp->nverts; i++) |
153 |
for (j = 0; j < 3; j++) |
154 |
pp->xyz[i][j] = mgetint(4); |
155 |
/* vertex normals */ |
156 |
if (flags & MT_N) |
157 |
for (i = 0; i < pp->nverts; i++) |
158 |
pp->norm[i] = mgetint(4); |
159 |
/* uv coordinates */ |
160 |
if (flags & MT_UV) |
161 |
for (i = 0; i < pp->nverts; i++) |
162 |
for (j = 0; j < 2; j++) |
163 |
pp->uv[i][j] = mgetint(4); |
164 |
/* local triangles */ |
165 |
pp->ntris = mgetint(2); |
166 |
if (pp->ntris < 0 || pp->ntris > 512) |
167 |
mesherror(USER, "bad number of local triangles"); |
168 |
if (pp->ntris) { |
169 |
pp->tri = (struct PTri *)malloc(pp->ntris * |
170 |
sizeof(struct PTri)); |
171 |
if (pp->tri == NULL) |
172 |
goto nomem; |
173 |
for (i = 0; i < pp->ntris; i++) { |
174 |
pp->tri[i].v1 = mgetint(1); |
175 |
pp->tri[i].v2 = mgetint(1); |
176 |
pp->tri[i].v3 = mgetint(1); |
177 |
} |
178 |
} else |
179 |
pp->tri = NULL; |
180 |
/* local triangle material(s) */ |
181 |
if (mgetint(2) > 1) { |
182 |
pp->trimat = (int16 *)malloc(pp->ntris*sizeof(int16)); |
183 |
if (pp->trimat == NULL) |
184 |
goto nomem; |
185 |
for (i = 0; i < pp->ntris; i++) |
186 |
pp->trimat[i] = mgetint(2); |
187 |
} else { |
188 |
pp->solemat = mgetint(2); |
189 |
pp->trimat = NULL; |
190 |
} |
191 |
/* joiner triangles */ |
192 |
pp->nj1tris = mgetint(2); |
193 |
if (pp->nj1tris < 0 || pp->nj1tris > 512) |
194 |
mesherror(USER, "bad number of joiner triangles"); |
195 |
if (pp->nj1tris) { |
196 |
pp->j1tri = (struct PJoin1 *)malloc(pp->nj1tris * |
197 |
sizeof(struct PJoin1)); |
198 |
if (pp->j1tri == NULL) |
199 |
goto nomem; |
200 |
for (i = 0; i < pp->nj1tris; i++) { |
201 |
pp->j1tri[i].v1j = mgetint(4); |
202 |
pp->j1tri[i].v2 = mgetint(1); |
203 |
pp->j1tri[i].v3 = mgetint(1); |
204 |
pp->j1tri[i].mat = mgetint(2); |
205 |
} |
206 |
} else |
207 |
pp->j1tri = NULL; |
208 |
/* double joiner triangles */ |
209 |
pp->nj2tris = mgetint(2); |
210 |
if (pp->nj2tris < 0 || pp->nj2tris > 256) |
211 |
mesherror(USER, "bad number of double joiner triangles"); |
212 |
if (pp->nj2tris) { |
213 |
pp->j2tri = (struct PJoin2 *)malloc(pp->nj2tris * |
214 |
sizeof(struct PJoin2)); |
215 |
if (pp->j2tri == NULL) |
216 |
goto nomem; |
217 |
for (i = 0; i < pp->nj2tris; i++) { |
218 |
pp->j2tri[i].v1j = mgetint(4); |
219 |
pp->j2tri[i].v2j = mgetint(4); |
220 |
pp->j2tri[i].v3 = mgetint(1); |
221 |
pp->j2tri[i].mat = mgetint(2); |
222 |
} |
223 |
} else |
224 |
pp->j2tri = NULL; |
225 |
return; |
226 |
nomem: |
227 |
error(SYSTEM, "out of mesh memory in getpatch"); |
228 |
} |
229 |
|
230 |
|
231 |
void |
232 |
readmesh(mp, path, flags) /* read in mesh structures */ |
233 |
MESH *mp; |
234 |
char *path; |
235 |
int flags; |
236 |
{ |
237 |
char *err; |
238 |
char sbuf[64]; |
239 |
int i; |
240 |
/* check what's loaded */ |
241 |
flags &= (IO_INFO|IO_BOUNDS|IO_TREE|IO_SCENE) & ~mp->ldflags; |
242 |
/* open input file */ |
243 |
if (path == NULL) { |
244 |
meshfn = "standard input"; |
245 |
meshfp = stdin; |
246 |
} else if ((meshfp = fopen(meshfn=path, "r")) == NULL) { |
247 |
sprintf(errmsg, "cannot open mesh file \"%s\"", path); |
248 |
error(SYSTEM, errmsg); |
249 |
} |
250 |
SET_FILE_BINARY(meshfp); |
251 |
/* read header */ |
252 |
checkheader(meshfp, MESHFMT, flags&IO_INFO ? stdout : (FILE *)NULL); |
253 |
/* read format number */ |
254 |
objsize = getint(2, meshfp) - MESHMAGIC; |
255 |
if (objsize <= 0 || objsize > MAXOBJSIZ || objsize > sizeof(long)) |
256 |
mesherror(USER, "incompatible mesh format"); |
257 |
/* read boundaries */ |
258 |
if (flags & IO_BOUNDS) { |
259 |
for (i = 0; i < 3; i++) |
260 |
mp->mcube.cuorg[i] = atof(getstr(sbuf, meshfp)); |
261 |
mp->mcube.cusize = atof(getstr(sbuf, meshfp)); |
262 |
for (i = 0; i < 2; i++) { |
263 |
mp->uvlim[0][i] = mgetflt(); |
264 |
mp->uvlim[1][i] = mgetflt(); |
265 |
} |
266 |
} else { |
267 |
for (i = 0; i < 4; i++) |
268 |
getstr(sbuf, meshfp); |
269 |
for (i = 0; i < 4; i++) |
270 |
mgetflt(); |
271 |
} |
272 |
/* read the octree */ |
273 |
if (flags & IO_TREE) |
274 |
mp->mcube.cutree = gettree(); |
275 |
else if (flags & IO_SCENE) |
276 |
skiptree(); |
277 |
/* read materials and patches */ |
278 |
if (flags & IO_SCENE) { |
279 |
mp->mat0 = nobjects; |
280 |
readscene(meshfp, objsize); |
281 |
mp->nmats = nobjects - mp->mat0; |
282 |
mp->npatches = mgetint(4); |
283 |
mp->patch = (MESHPATCH *)calloc(mp->npatches, |
284 |
sizeof(MESHPATCH)); |
285 |
if (mp->patch == NULL) |
286 |
mesherror(SYSTEM, "out of patch memory"); |
287 |
for (i = 0; i < mp->npatches; i++) |
288 |
getpatch(&mp->patch[i]); |
289 |
} |
290 |
/* clean up */ |
291 |
fclose(meshfp); |
292 |
mp->ldflags |= flags; |
293 |
/* verify data */ |
294 |
if ((err = checkmesh(mp)) != NULL) |
295 |
mesherror(USER, err); |
296 |
} |