src/common/readmesh.c

#ifndef lint
static const char RCSid[] = "$Id: readmesh.c,v 2.3 2003/06/05 19:29:34 schorsch Exp $";
#endif
/*
 *  Routines for reading a compiled mesh from a file
 */

#include  "standard.h"
#include  "octree.h"
#include  "object.h"
#include  "mesh.h"
#include  "resolu.h"

static char     *meshfn;        /* input file name */
static FILE     *meshfp;        /* mesh file pointer */
static int      objsize;        /* sizeof(OBJECT) from writer */


static void
mesherror(etyp, msg)                    /* mesh read error */
int  etyp;
char  *msg;
{
        char  msgbuf[128];

        sprintf(msgbuf, "(%s): %s", meshfn, msg);
        error(etyp, msgbuf);
}


static long
mgetint(siz)                            /* get a siz-byte integer */
int  siz;
{
        register long  r;

        r = getint(siz, meshfp);
        if (feof(meshfp))
                mesherror(USER, "truncated mesh file");
        return(r);
}


static double
mgetflt()                               /* get a floating point number */
{
        double  r;

        r = getflt(meshfp);
        if (feof(meshfp))
                mesherror(USER, "truncated mesh file");
        return(r);
}
        

static OCTREE
getfullnode()                           /* get a set, return fullnode */
{
        OBJECT  set[MAXSET+1];
        register int  i;

        if ((set[0] = mgetint(objsize)) > MAXSET)
                mesherror(USER, "bad set in getfullnode");
        for (i = 1; i <= set[0]; i++)
                set[i] = mgetint(objsize);
        return(fullnode(set));
}       


static OCTREE
gettree()                               /* get a pre-ordered octree */
{
        register OCTREE  ot;
        register int  i;
        
        switch (getc(meshfp)) {
                case OT_EMPTY:
                        return(EMPTY);
                case OT_FULL:
                        return(getfullnode());
                case OT_TREE:
                        if ((ot = octalloc()) == EMPTY)
                                mesherror(SYSTEM, "out of tree space in readmesh");
                        for (i = 0; i < 8; i++)
                                octkid(ot, i) = gettree();
                        return(ot);
                case EOF:
                        mesherror(USER, "truncated mesh octree");
                default:
                        mesherror(USER, "damaged mesh octree");
        }
        return NULL; /* pro forma return */
}


static void
skiptree()                              /* skip octree on input */
{
        register int  i;
        
        switch (getc(meshfp)) {
        case OT_EMPTY:
                return;
        case OT_FULL:
                for (i = mgetint(objsize)*objsize; i-- > 0; )
                        if (getc(meshfp) == EOF)
                                mesherror(USER, "truncated mesh octree");
                return;
        case OT_TREE:
                for (i = 0; i < 8; i++)
                        skiptree();
                return;
        case EOF:
                mesherror(USER, "truncated mesh octree");
        default:
                mesherror(USER, "damaged mesh octree");
        }
}


static void
getpatch(pp)                            /* load a mesh patch */
register MESHPATCH      *pp;
{
        int     flags;
        int     i, j;
                                        /* vertex flags */
        flags = mgetint(1);
        if (!(flags & MT_V) || flags & ~(MT_V|MT_N|MT_UV))
                mesherror(USER, "bad patch flags");
                                        /* allocate vertices */
        pp->nverts = mgetint(2);
        if (pp->nverts <= 0 || pp->nverts > 256)
                mesherror(USER, "bad number of patch vertices");
        pp->xyz = (uint4 (*)[3])malloc(pp->nverts*3*sizeof(uint4));
        if (pp->xyz == NULL)
                goto nomem;
        if (flags & MT_N) {
                pp->norm = (int4 *)calloc(pp->nverts, sizeof(int4));
                if (pp->norm == NULL)
                        goto nomem;
        } else
                pp->norm = NULL;
        if (flags & MT_UV) {
                pp->uv = (uint4 (*)[2])calloc(pp->nverts, 2*sizeof(uint4));
                if (pp->uv == NULL)
                        goto nomem;
        } else
                pp->uv = NULL;
                                        /* vertex xyz locations */
        for (i = 0; i < pp->nverts; i++)
                for (j = 0; j < 3; j++)
                        pp->xyz[i][j] = mgetint(4);
                                        /* vertex normals */
        if (flags & MT_N)
                for (i = 0; i < pp->nverts; i++)
                        pp->norm[i] = mgetint(4);
                                        /* uv coordinates */
        if (flags & MT_UV)
                for (i = 0; i < pp->nverts; i++)
                        for (j = 0; j < 2; j++)
                                pp->uv[i][j] = mgetint(4);
                                        /* local triangles */
        pp->ntris = mgetint(2);
        if (pp->ntris < 0 || pp->ntris > 512)
                mesherror(USER, "bad number of local triangles");
        if (pp->ntris) {
                pp->tri = (struct PTri *)malloc(pp->ntris *
                                                sizeof(struct PTri));
                if (pp->tri == NULL)
                        goto nomem;
                for (i = 0; i < pp->ntris; i++) {
                        pp->tri[i].v1 = mgetint(1);
                        pp->tri[i].v2 = mgetint(1);
                        pp->tri[i].v3 = mgetint(1);
                }
        } else
                pp->tri = NULL;
                                        /* local triangle material(s) */
        if (mgetint(2) > 1) {
                pp->trimat = (int2 *)malloc(pp->ntris*sizeof(int2));
                if (pp->trimat == NULL)
                        goto nomem;
                for (i = 0; i < pp->ntris; i++)
                        pp->trimat[i] = mgetint(2);
        } else {
                pp->solemat = mgetint(2);
                pp->trimat = NULL;
        }
                                        /* joiner triangles */
        pp->nj1tris = mgetint(2);
        if (pp->nj1tris < 0 || pp->nj1tris > 512)
                mesherror(USER, "bad number of joiner triangles");
        if (pp->nj1tris) {
                pp->j1tri = (struct PJoin1 *)malloc(pp->nj1tris *
                                                sizeof(struct PJoin1));
                if (pp->j1tri == NULL)
                        goto nomem;
                for (i = 0; i < pp->nj1tris; i++) {
                        pp->j1tri[i].v1j = mgetint(4);
                        pp->j1tri[i].v2 = mgetint(1);
                        pp->j1tri[i].v3 = mgetint(1);
                        pp->j1tri[i].mat = mgetint(2);
                }
        } else
                pp->j1tri = NULL;
                                        /* double joiner triangles */
        pp->nj2tris = mgetint(2);
        if (pp->nj2tris < 0 || pp->nj2tris > 256)
                mesherror(USER, "bad number of double joiner triangles");
        if (pp->nj2tris) {
                pp->j2tri = (struct PJoin2 *)malloc(pp->nj2tris *
                                                sizeof(struct PJoin2));
                if (pp->j2tri == NULL)
                        goto nomem;
                for (i = 0; i < pp->nj2tris; i++) {
                        pp->j2tri[i].v1j = mgetint(4);
                        pp->j2tri[i].v2j = mgetint(4);
                        pp->j2tri[i].v3 = mgetint(1);
                        pp->j2tri[i].mat = mgetint(2);
                }
        } else
                pp->j2tri = NULL;
        return;
nomem:
        error(SYSTEM, "out of mesh memory in getpatch");
}


void
readmesh(mp, path, flags)               /* read in mesh structures */
MESH    *mp;
char    *path;
int     flags;
{
        char    *err;
        char    sbuf[64];
        int     i;
                                        /* check what's loaded */
        flags &= (IO_INFO|IO_BOUNDS|IO_TREE|IO_SCENE) & ~mp->ldflags;
                                        /* open input file */
        if (path == NULL) {
                meshfn = "standard input";
                meshfp = stdin;
        } else if ((meshfp = fopen(meshfn=path, "r")) == NULL) {
                sprintf(errmsg, "cannot open mesh file \"%s\"", path);
                error(SYSTEM, errmsg);
        }
        SET_FILE_BINARY(meshfp);
                                        /* read header */
        checkheader(meshfp, MESHFMT, flags&IO_INFO ? stdout : (FILE *)NULL);
                                        /* read format number */
        objsize = getint(2, meshfp) - MESHMAGIC;
        if (objsize <= 0 || objsize > MAXOBJSIZ || objsize > sizeof(long))
                mesherror(USER, "incompatible mesh format");
                                        /* read boundaries */
        if (flags & IO_BOUNDS) {
                for (i = 0; i < 3; i++)
                        mp->mcube.cuorg[i] = atof(getstr(sbuf, meshfp));
                mp->mcube.cusize = atof(getstr(sbuf, meshfp));
                for (i = 0; i < 2; i++) {
                        mp->uvlim[0][i] = mgetflt();
                        mp->uvlim[1][i] = mgetflt();
                }
        } else {
                for (i = 0; i < 4; i++)
                        getstr(sbuf, meshfp);
                for (i = 0; i < 4; i++)
                        mgetflt();
        }
                                        /* read the octree */
        if (flags & IO_TREE)
                mp->mcube.cutree = gettree();
        else if (flags & IO_SCENE)
                skiptree();
                                        /* read materials and patches */
        if (flags & IO_SCENE) {
                mp->mat0 = nobjects;
                readscene(meshfp, objsize);
                mp->nmats = nobjects - mp->mat0;
                mp->npatches = mgetint(4);
                mp->patch = (MESHPATCH *)calloc(mp->npatches,
                                        sizeof(MESHPATCH));
                if (mp->patch == NULL)
                        mesherror(SYSTEM, "out of patch memory");
                for (i = 0; i < mp->npatches; i++)
                        getpatch(&mp->patch[i]);
        }
                                        /* clean up */
        fclose(meshfp);
        mp->ldflags |= flags;
                                        /* verify data */
        if ((err = checkmesh(mp)) != NULL)
                mesherror(USER, err);
}
Revision:	2.4
Committed:	Sat Jun 7 12:50:20 2003 UTC (20 years, 10 months ago) by schorsch
Content type:	text/plain
Branch:	MAIN
Changes since 2.3:	+17 -15 lines
Log Message:	Various small changes to reduce compile warnings/errors on Windows.
#	User	Rev	Content
1	greg	2.1	#ifndef lint
2	schorsch	2.4	static const char RCSid[] = "$Id: readmesh.c,v 2.3 2003/06/05 19:29:34 schorsch Exp $";
3	greg	2.1	#endif
4			/*
5			* Routines for reading a compiled mesh from a file
6			*/
7
8			#include "standard.h"
9			#include "octree.h"
10			#include "object.h"
11			#include "mesh.h"
12	schorsch	2.4	#include "resolu.h"
13	greg	2.1
14			static char meshfn; / input file name */
15			static FILE meshfp; / mesh file pointer */
16			static int objsize; /* sizeof(OBJECT) from writer */
17
18
19			static void
20			mesherror(etyp, msg) /* mesh read error */
21			int etyp;
22			char *msg;
23			{
24			char msgbuf[128];
25
26			sprintf(msgbuf, "(%s): %s", meshfn, msg);
27			error(etyp, msgbuf);
28			}
29
30
31			static long
32			mgetint(siz) /* get a siz-byte integer */
33			int siz;
34			{
35			register long r;
36
37			r = getint(siz, meshfp);
38			if (feof(meshfp))
39			mesherror(USER, "truncated mesh file");
40			return(r);
41			}
42
43
44			static double
45			mgetflt() /* get a floating point number */
46			{
47			double r;
48
49			r = getflt(meshfp);
50			if (feof(meshfp))
51			mesherror(USER, "truncated mesh file");
52			return(r);
53			}
54
55
56			static OCTREE
57			getfullnode() /* get a set, return fullnode */
58			{
59			OBJECT set[MAXSET+1];
60			register int i;
61
62			if ((set[0] = mgetint(objsize)) > MAXSET)
63			mesherror(USER, "bad set in getfullnode");
64			for (i = 1; i <= set[0]; i++)
65			set[i] = mgetint(objsize);
66			return(fullnode(set));
67			}
68
69
70			static OCTREE
71			gettree() /* get a pre-ordered octree */
72			{
73			register OCTREE ot;
74			register int i;
75
76			switch (getc(meshfp)) {
77	schorsch	2.4	case OT_EMPTY:
78			return(EMPTY);
79			case OT_FULL:
80			return(getfullnode());
81			case OT_TREE:
82			if ((ot = octalloc()) == EMPTY)
83			mesherror(SYSTEM, "out of tree space in readmesh");
84			for (i = 0; i < 8; i++)
85			octkid(ot, i) = gettree();
86			return(ot);
87			case EOF:
88			mesherror(USER, "truncated mesh octree");
89			default:
90			mesherror(USER, "damaged mesh octree");
91	greg	2.1	}
92	schorsch	2.4	return NULL; /* pro forma return */
93	greg	2.1	}
94
95
96			static void
97			skiptree() /* skip octree on input */
98			{
99			register int i;
100
101			switch (getc(meshfp)) {
102			case OT_EMPTY:
103			return;
104			case OT_FULL:
105			for (i = mgetint(objsize)*objsize; i-- > 0; )
106			if (getc(meshfp) == EOF)
107			mesherror(USER, "truncated mesh octree");
108			return;
109			case OT_TREE:
110			for (i = 0; i < 8; i++)
111			skiptree();
112			return;
113			case EOF:
114			mesherror(USER, "truncated mesh octree");
115			default:
116			mesherror(USER, "damaged mesh octree");
117			}
118			}
119
120
121			static void
122			getpatch(pp) /* load a mesh patch */
123			register MESHPATCH *pp;
124			{
125			int flags;
126			int i, j;
127			/* vertex flags */
128			flags = mgetint(1);
129			if (!(flags & MT_V) \|\| flags & ~(MT_V\|MT_N\|MT_UV))
130			mesherror(USER, "bad patch flags");
131			/* allocate vertices */
132			pp->nverts = mgetint(2);
133			if (pp->nverts <= 0 \|\| pp->nverts > 256)
134			mesherror(USER, "bad number of patch vertices");
135			pp->xyz = (uint4 ()[3])malloc(pp->nverts3*sizeof(uint4));
136			if (pp->xyz == NULL)
137			goto nomem;
138			if (flags & MT_N) {
139			pp->norm = (int4 *)calloc(pp->nverts, sizeof(int4));
140			if (pp->norm == NULL)
141			goto nomem;
142			} else
143			pp->norm = NULL;
144			if (flags & MT_UV) {
145			pp->uv = (uint4 ()[2])calloc(pp->nverts, 2sizeof(uint4));
146			if (pp->uv == NULL)
147			goto nomem;
148			} else
149			pp->uv = NULL;
150			/* vertex xyz locations */
151			for (i = 0; i < pp->nverts; i++)
152			for (j = 0; j < 3; j++)
153			pp->xyz[i][j] = mgetint(4);
154			/* vertex normals */
155			if (flags & MT_N)
156			for (i = 0; i < pp->nverts; i++)
157			pp->norm[i] = mgetint(4);
158			/* uv coordinates */
159			if (flags & MT_UV)
160			for (i = 0; i < pp->nverts; i++)
161			for (j = 0; j < 2; j++)
162			pp->uv[i][j] = mgetint(4);
163			/* local triangles */
164			pp->ntris = mgetint(2);
165			if (pp->ntris < 0 \|\| pp->ntris > 512)
166			mesherror(USER, "bad number of local triangles");
167			if (pp->ntris) {
168			pp->tri = (struct PTri )malloc(pp->ntris
169			sizeof(struct PTri));
170			if (pp->tri == NULL)
171			goto nomem;
172			for (i = 0; i < pp->ntris; i++) {
173			pp->tri[i].v1 = mgetint(1);
174			pp->tri[i].v2 = mgetint(1);
175			pp->tri[i].v3 = mgetint(1);
176			}
177			} else
178			pp->tri = NULL;
179	greg	2.2	/* local triangle material(s) */
180			if (mgetint(2) > 1) {
181			pp->trimat = (int2 )malloc(pp->ntrissizeof(int2));
182			if (pp->trimat == NULL)
183			goto nomem;
184			for (i = 0; i < pp->ntris; i++)
185			pp->trimat[i] = mgetint(2);
186			} else {
187			pp->solemat = mgetint(2);
188			pp->trimat = NULL;
189			}
190	greg	2.1	/* joiner triangles */
191			pp->nj1tris = mgetint(2);
192			if (pp->nj1tris < 0 \|\| pp->nj1tris > 512)
193			mesherror(USER, "bad number of joiner triangles");
194			if (pp->nj1tris) {
195			pp->j1tri = (struct PJoin1 )malloc(pp->nj1tris
196			sizeof(struct PJoin1));
197			if (pp->j1tri == NULL)
198			goto nomem;
199			for (i = 0; i < pp->nj1tris; i++) {
200			pp->j1tri[i].v1j = mgetint(4);
201			pp->j1tri[i].v2 = mgetint(1);
202			pp->j1tri[i].v3 = mgetint(1);
203	greg	2.2	pp->j1tri[i].mat = mgetint(2);
204	greg	2.1	}
205			} else
206			pp->j1tri = NULL;
207			/* double joiner triangles */
208			pp->nj2tris = mgetint(2);
209			if (pp->nj2tris < 0 \|\| pp->nj2tris > 256)
210			mesherror(USER, "bad number of double joiner triangles");
211			if (pp->nj2tris) {
212			pp->j2tri = (struct PJoin2 )malloc(pp->nj2tris
213			sizeof(struct PJoin2));
214			if (pp->j2tri == NULL)
215			goto nomem;
216			for (i = 0; i < pp->nj2tris; i++) {
217			pp->j2tri[i].v1j = mgetint(4);
218			pp->j2tri[i].v2j = mgetint(4);
219			pp->j2tri[i].v3 = mgetint(1);
220	greg	2.2	pp->j2tri[i].mat = mgetint(2);
221	greg	2.1	}
222			} else
223			pp->j2tri = NULL;
224			return;
225			nomem:
226			error(SYSTEM, "out of mesh memory in getpatch");
227			}
228
229
230			void
231			readmesh(mp, path, flags) /* read in mesh structures */
232			MESH *mp;
233			char *path;
234			int flags;
235			{
236	greg	2.2	char *err;
237	greg	2.1	char sbuf[64];
238			int i;
239			/* check what's loaded */
240			flags &= (IO_INFO\|IO_BOUNDS\|IO_TREE\|IO_SCENE) & ~mp->ldflags;
241			/* open input file */
242			if (path == NULL) {
243			meshfn = "standard input";
244			meshfp = stdin;
245			} else if ((meshfp = fopen(meshfn=path, "r")) == NULL) {
246			sprintf(errmsg, "cannot open mesh file \"%s\"", path);
247			error(SYSTEM, errmsg);
248			}
249	schorsch	2.3	SET_FILE_BINARY(meshfp);
250	greg	2.1	/* read header */
251			checkheader(meshfp, MESHFMT, flags&IO_INFO ? stdout : (FILE *)NULL);
252			/* read format number */
253			objsize = getint(2, meshfp) - MESHMAGIC;
254			if (objsize <= 0 \|\| objsize > MAXOBJSIZ \|\| objsize > sizeof(long))
255			mesherror(USER, "incompatible mesh format");
256			/* read boundaries */
257			if (flags & IO_BOUNDS) {
258			for (i = 0; i < 3; i++)
259			mp->mcube.cuorg[i] = atof(getstr(sbuf, meshfp));
260			mp->mcube.cusize = atof(getstr(sbuf, meshfp));
261			for (i = 0; i < 2; i++) {
262			mp->uvlim[0][i] = mgetflt();
263			mp->uvlim[1][i] = mgetflt();
264			}
265			} else {
266			for (i = 0; i < 4; i++)
267			getstr(sbuf, meshfp);
268			for (i = 0; i < 4; i++)
269			mgetflt();
270			}
271			/* read the octree */
272			if (flags & IO_TREE)
273			mp->mcube.cutree = gettree();
274			else if (flags & IO_SCENE)
275			skiptree();
276	greg	2.2	/* read materials and patches */
277	greg	2.1	if (flags & IO_SCENE) {
278	greg	2.2	mp->mat0 = nobjects;
279			readscene(meshfp, objsize);
280			mp->nmats = nobjects - mp->mat0;
281	greg	2.1	mp->npatches = mgetint(4);
282			mp->patch = (MESHPATCH *)calloc(mp->npatches,
283			sizeof(MESHPATCH));
284			if (mp->patch == NULL)
285			mesherror(SYSTEM, "out of patch memory");
286			for (i = 0; i < mp->npatches; i++)
287			getpatch(&mp->patch[i]);
288			}
289			/* clean up */
290			fclose(meshfp);
291			mp->ldflags \|= flags;
292	greg	2.2	/* verify data */
293			if ((err = checkmesh(mp)) != NULL)
294			mesherror(USER, err);
295	greg	2.1	}