src/common/readmesh.c

#ifndef lint
static const char RCSid[] = "$Id: readmesh.c,v 2.11 2004/01/30 00:08:31 greg Exp $";
#endif
/*
 *  Routines for reading a compiled mesh from a file
 */

#include  <time.h>

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

#ifdef getc_unlocked            /* avoid horrendous overhead of flockfile */
#define getc    getc_unlocked
#endif

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 (OCTREE)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:	2.12
Committed:	Thu Apr 29 14:36:49 2004 UTC (20 years ago) by greg
Content type:	text/plain
Branch:	MAIN
Changes since 2.11:	+5 -1 lines
Log Message:	Added macros to avoid flockfile(3) overhead
#	User	Rev	Content
1	greg	2.1	#ifndef lint
2	greg	2.12	static const char RCSid[] = "$Id: readmesh.c,v 2.11 2004/01/30 00:08:31 greg Exp $";
3	greg	2.1	#endif
4			/*
5			* Routines for reading a compiled mesh from a file
6			*/
7	greg	2.7
8			#include <time.h>
9	greg	2.1
10	greg	2.10	#include "platform.h"
11	greg	2.1	#include "standard.h"
12			#include "octree.h"
13			#include "object.h"
14			#include "mesh.h"
15	schorsch	2.4	#include "resolu.h"
16	greg	2.1
17	greg	2.12	#ifdef getc_unlocked /* avoid horrendous overhead of flockfile */
18			#define getc getc_unlocked
19			#endif
20
21	greg	2.1	static char meshfn; / input file name */
22			static FILE meshfp; / mesh file pointer */
23			static int objsize; /* sizeof(OBJECT) from writer */
24
25
26			static void
27			mesherror(etyp, msg) /* mesh read error */
28			int etyp;
29			char *msg;
30			{
31			char msgbuf[128];
32
33			sprintf(msgbuf, "(%s): %s", meshfn, msg);
34			error(etyp, msgbuf);
35			}
36
37
38			static long
39			mgetint(siz) /* get a siz-byte integer */
40			int siz;
41			{
42			register long r;
43
44			r = getint(siz, meshfp);
45			if (feof(meshfp))
46			mesherror(USER, "truncated mesh file");
47			return(r);
48			}
49
50
51			static double
52			mgetflt() /* get a floating point number */
53			{
54			double r;
55
56			r = getflt(meshfp);
57			if (feof(meshfp))
58			mesherror(USER, "truncated mesh file");
59			return(r);
60			}
61
62
63			static OCTREE
64			getfullnode() /* get a set, return fullnode */
65			{
66			OBJECT set[MAXSET+1];
67			register int i;
68
69			if ((set[0] = mgetint(objsize)) > MAXSET)
70			mesherror(USER, "bad set in getfullnode");
71			for (i = 1; i <= set[0]; i++)
72			set[i] = mgetint(objsize);
73			return(fullnode(set));
74			}
75
76
77			static OCTREE
78			gettree() /* get a pre-ordered octree */
79			{
80			register OCTREE ot;
81			register int i;
82
83			switch (getc(meshfp)) {
84	schorsch	2.4	case OT_EMPTY:
85			return(EMPTY);
86			case OT_FULL:
87			return(getfullnode());
88			case OT_TREE:
89			if ((ot = octalloc()) == EMPTY)
90			mesherror(SYSTEM, "out of tree space in readmesh");
91			for (i = 0; i < 8; i++)
92			octkid(ot, i) = gettree();
93			return(ot);
94			case EOF:
95			mesherror(USER, "truncated mesh octree");
96			default:
97			mesherror(USER, "damaged mesh octree");
98	greg	2.1	}
99	schorsch	2.8	return (OCTREE)NULL; /* pro forma return */
100	greg	2.1	}
101
102
103			static void
104			skiptree() /* skip octree on input */
105			{
106			register int i;
107
108			switch (getc(meshfp)) {
109			case OT_EMPTY:
110			return;
111			case OT_FULL:
112			for (i = mgetint(objsize)*objsize; i-- > 0; )
113			if (getc(meshfp) == EOF)
114			mesherror(USER, "truncated mesh octree");
115			return;
116			case OT_TREE:
117			for (i = 0; i < 8; i++)
118			skiptree();
119			return;
120			case EOF:
121			mesherror(USER, "truncated mesh octree");
122			default:
123			mesherror(USER, "damaged mesh octree");
124			}
125			}
126
127
128			static void
129			getpatch(pp) /* load a mesh patch */
130			register MESHPATCH *pp;
131			{
132			int flags;
133			int i, j;
134			/* vertex flags */
135			flags = mgetint(1);
136			if (!(flags & MT_V) \|\| flags & ~(MT_V\|MT_N\|MT_UV))
137			mesherror(USER, "bad patch flags");
138			/* allocate vertices */
139			pp->nverts = mgetint(2);
140			if (pp->nverts <= 0 \|\| pp->nverts > 256)
141			mesherror(USER, "bad number of patch vertices");
142	greg	2.6	pp->xyz = (uint32 ()[3])malloc(pp->nverts3*sizeof(uint32));
143	greg	2.1	if (pp->xyz == NULL)
144			goto nomem;
145			if (flags & MT_N) {
146	greg	2.6	pp->norm = (int32 *)calloc(pp->nverts, sizeof(int32));
147	greg	2.1	if (pp->norm == NULL)
148			goto nomem;
149			} else
150			pp->norm = NULL;
151			if (flags & MT_UV) {
152	greg	2.11	pp->uv = (uint32 ()[2])calloc(pp->nverts, 2sizeof(uint32));
153	greg	2.1	if (pp->uv == NULL)
154			goto nomem;
155			} else
156			pp->uv = NULL;
157			/* vertex xyz locations */
158			for (i = 0; i < pp->nverts; i++)
159			for (j = 0; j < 3; j++)
160			pp->xyz[i][j] = mgetint(4);
161			/* vertex normals */
162			if (flags & MT_N)
163			for (i = 0; i < pp->nverts; i++)
164			pp->norm[i] = mgetint(4);
165			/* uv coordinates */
166			if (flags & MT_UV)
167			for (i = 0; i < pp->nverts; i++)
168			for (j = 0; j < 2; j++)
169	greg	2.11	pp->uv[i][j] = mgetint(4);
170	greg	2.1	/* local triangles */
171			pp->ntris = mgetint(2);
172			if (pp->ntris < 0 \|\| pp->ntris > 512)
173			mesherror(USER, "bad number of local triangles");
174			if (pp->ntris) {
175			pp->tri = (struct PTri )malloc(pp->ntris
176			sizeof(struct PTri));
177			if (pp->tri == NULL)
178			goto nomem;
179			for (i = 0; i < pp->ntris; i++) {
180			pp->tri[i].v1 = mgetint(1);
181			pp->tri[i].v2 = mgetint(1);
182			pp->tri[i].v3 = mgetint(1);
183			}
184			} else
185			pp->tri = NULL;
186	greg	2.2	/* local triangle material(s) */
187			if (mgetint(2) > 1) {
188	greg	2.6	pp->trimat = (int16 )malloc(pp->ntrissizeof(int16));
189	greg	2.2	if (pp->trimat == NULL)
190			goto nomem;
191			for (i = 0; i < pp->ntris; i++)
192			pp->trimat[i] = mgetint(2);
193			} else {
194			pp->solemat = mgetint(2);
195			pp->trimat = NULL;
196			}
197	greg	2.1	/* joiner triangles */
198			pp->nj1tris = mgetint(2);
199			if (pp->nj1tris < 0 \|\| pp->nj1tris > 512)
200			mesherror(USER, "bad number of joiner triangles");
201			if (pp->nj1tris) {
202			pp->j1tri = (struct PJoin1 )malloc(pp->nj1tris
203			sizeof(struct PJoin1));
204			if (pp->j1tri == NULL)
205			goto nomem;
206			for (i = 0; i < pp->nj1tris; i++) {
207			pp->j1tri[i].v1j = mgetint(4);
208			pp->j1tri[i].v2 = mgetint(1);
209			pp->j1tri[i].v3 = mgetint(1);
210	greg	2.2	pp->j1tri[i].mat = mgetint(2);
211	greg	2.1	}
212			} else
213			pp->j1tri = NULL;
214			/* double joiner triangles */
215			pp->nj2tris = mgetint(2);
216			if (pp->nj2tris < 0 \|\| pp->nj2tris > 256)
217			mesherror(USER, "bad number of double joiner triangles");
218			if (pp->nj2tris) {
219			pp->j2tri = (struct PJoin2 )malloc(pp->nj2tris
220			sizeof(struct PJoin2));
221			if (pp->j2tri == NULL)
222			goto nomem;
223			for (i = 0; i < pp->nj2tris; i++) {
224			pp->j2tri[i].v1j = mgetint(4);
225			pp->j2tri[i].v2j = mgetint(4);
226			pp->j2tri[i].v3 = mgetint(1);
227	greg	2.2	pp->j2tri[i].mat = mgetint(2);
228	greg	2.1	}
229			} else
230			pp->j2tri = NULL;
231			return;
232			nomem:
233			error(SYSTEM, "out of mesh memory in getpatch");
234			}
235
236
237			void
238			readmesh(mp, path, flags) /* read in mesh structures */
239			MESH *mp;
240			char *path;
241			int flags;
242			{
243	greg	2.2	char *err;
244	greg	2.1	char sbuf[64];
245			int i;
246			/* check what's loaded */
247			flags &= (IO_INFO\|IO_BOUNDS\|IO_TREE\|IO_SCENE) & ~mp->ldflags;
248			/* open input file */
249			if (path == NULL) {
250			meshfn = "standard input";
251			meshfp = stdin;
252			} else if ((meshfp = fopen(meshfn=path, "r")) == NULL) {
253			sprintf(errmsg, "cannot open mesh file \"%s\"", path);
254			error(SYSTEM, errmsg);
255			}
256	schorsch	2.3	SET_FILE_BINARY(meshfp);
257	greg	2.1	/* read header */
258			checkheader(meshfp, MESHFMT, flags&IO_INFO ? stdout : (FILE *)NULL);
259			/* read format number */
260			objsize = getint(2, meshfp) - MESHMAGIC;
261			if (objsize <= 0 \|\| objsize > MAXOBJSIZ \|\| objsize > sizeof(long))
262			mesherror(USER, "incompatible mesh format");
263			/* read boundaries */
264			if (flags & IO_BOUNDS) {
265			for (i = 0; i < 3; i++)
266			mp->mcube.cuorg[i] = atof(getstr(sbuf, meshfp));
267			mp->mcube.cusize = atof(getstr(sbuf, meshfp));
268			for (i = 0; i < 2; i++) {
269			mp->uvlim[0][i] = mgetflt();
270			mp->uvlim[1][i] = mgetflt();
271			}
272			} else {
273			for (i = 0; i < 4; i++)
274			getstr(sbuf, meshfp);
275			for (i = 0; i < 4; i++)
276			mgetflt();
277			}
278			/* read the octree */
279			if (flags & IO_TREE)
280			mp->mcube.cutree = gettree();
281			else if (flags & IO_SCENE)
282			skiptree();
283	greg	2.2	/* read materials and patches */
284	greg	2.1	if (flags & IO_SCENE) {
285	greg	2.2	mp->mat0 = nobjects;
286			readscene(meshfp, objsize);
287			mp->nmats = nobjects - mp->mat0;
288	greg	2.1	mp->npatches = mgetint(4);
289			mp->patch = (MESHPATCH *)calloc(mp->npatches,
290			sizeof(MESHPATCH));
291			if (mp->patch == NULL)
292			mesherror(SYSTEM, "out of patch memory");
293			for (i = 0; i < mp->npatches; i++)
294			getpatch(&mp->patch[i]);
295			}
296			/* clean up */
297			fclose(meshfp);
298			mp->ldflags \|= flags;
299	greg	2.2	/* verify data */
300			if ((err = checkmesh(mp)) != NULL)
301			mesherror(USER, err);
302	greg	2.1	}