| 1 |
#ifndef lint |
| 2 |
static const char RCSid[] = "$Id: readmesh.c,v 2.4 2003/06/07 12:50:20 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 = (uint4 (*)[3])malloc(pp->nverts*3*sizeof(uint4)); |
| 137 |
if (pp->xyz == NULL) |
| 138 |
goto nomem; |
| 139 |
if (flags & MT_N) { |
| 140 |
pp->norm = (int4 *)calloc(pp->nverts, sizeof(int4)); |
| 141 |
if (pp->norm == NULL) |
| 142 |
goto nomem; |
| 143 |
} else |
| 144 |
pp->norm = NULL; |
| 145 |
if (flags & MT_UV) { |
| 146 |
pp->uv = (uint4 (*)[2])calloc(pp->nverts, 2*sizeof(uint4)); |
| 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 = (int2 *)malloc(pp->ntris*sizeof(int2)); |
| 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 |
} |
