src/common/readmesh.c

#ifndef lint
static const char RCSid[] = "$Id: readmesh.c,v 2.5 2003/06/08 12:03:09 schorsch Exp $";
#endif
/*
 *  Routines for reading a compiled mesh from a file
 */

#include  "standard.h"
#include  "platform.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 = (uint32 (*)[3])malloc(pp->nverts*3*sizeof(uint32));
        if (pp->xyz == NULL)
                goto nomem;
        if (flags & MT_N) {
                pp->norm = (int32 *)calloc(pp->nverts, sizeof(int32));
                if (pp->norm == NULL)
                        goto nomem;
        } else
                pp->norm = NULL;
        if (flags & MT_UV) {
                pp->uv = (uint32 (*)[2])calloc(pp->nverts, 2*sizeof(uint32));
                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 = (int16 *)malloc(pp->ntris*sizeof(int16));
                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:	2.6
Committed:	Fri Jun 20 00:25:49 2003 UTC (22 years, 4 months ago) by greg
Content type:	text/plain
Branch:	MAIN
Changes since 2.5:	+5 -5 lines
Log Message:	Changed instances of "int4" to "int32" and "int2" to "int16"
#	User	Rev	Content
1	greg	2.1	#ifndef lint
2	greg	2.6	static const char RCSid[] = "$Id: readmesh.c,v 2.5 2003/06/08 12:03:09 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	schorsch	2.5	#include "platform.h"
10	greg	2.1	#include "octree.h"
11			#include "object.h"
12			#include "mesh.h"
13	schorsch	2.4	#include "resolu.h"
14	greg	2.1
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	schorsch	2.4	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	greg	2.1	}
93	schorsch	2.4	return NULL; /* pro forma return */
94	greg	2.1	}
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	greg	2.6	pp->xyz = (uint32 ()[3])malloc(pp->nverts3*sizeof(uint32));
137	greg	2.1	if (pp->xyz == NULL)
138			goto nomem;
139			if (flags & MT_N) {
140	greg	2.6	pp->norm = (int32 *)calloc(pp->nverts, sizeof(int32));
141	greg	2.1	if (pp->norm == NULL)
142			goto nomem;
143			} else
144			pp->norm = NULL;
145			if (flags & MT_UV) {
146	greg	2.6	pp->uv = (uint32 ()[2])calloc(pp->nverts, 2sizeof(uint32));
147	greg	2.1	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	greg	2.2	/* local triangle material(s) */
181			if (mgetint(2) > 1) {
182	greg	2.6	pp->trimat = (int16 )malloc(pp->ntrissizeof(int16));
183	greg	2.2	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	greg	2.1	/* 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	greg	2.2	pp->j1tri[i].mat = mgetint(2);
205	greg	2.1	}
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	greg	2.2	pp->j2tri[i].mat = mgetint(2);
222	greg	2.1	}
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	greg	2.2	char *err;
238	greg	2.1	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	schorsch	2.3	SET_FILE_BINARY(meshfp);
251	greg	2.1	/* 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	greg	2.2	/* read materials and patches */
278	greg	2.1	if (flags & IO_SCENE) {
279	greg	2.2	mp->mat0 = nobjects;
280			readscene(meshfp, objsize);
281			mp->nmats = nobjects - mp->mat0;
282	greg	2.1	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	greg	2.2	/* verify data */
294			if ((err = checkmesh(mp)) != NULL)
295			mesherror(USER, err);
296	greg	2.1	}