src/common/readmesh.c

#ifndef lint
static const char RCSid[] = "$Id: readmesh.c,v 2.8 2003/07/30 10:11:06 schorsch Exp $";
#endif
/*
 *  Routines for reading a compiled mesh from a file
 */

#include  <time.h>

#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 (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 = (uint16 (*)[2])calloc(pp->nverts, 2*sizeof(uint16));
                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(2);
                                        /* 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:	2.9
Committed:	Thu Sep 18 16:53:53 2003 UTC (20 years, 7 months ago) by greg
Content type:	text/plain
Branch:	MAIN
Changes since 2.8:	+3 -3 lines
Log Message:	Reduced texture coordinate size to 16-bits/sample
#	User	Rev	Content
1	greg	2.1	#ifndef lint
2	greg	2.9	static const char RCSid[] = "$Id: readmesh.c,v 2.8 2003/07/30 10:11:06 schorsch 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			#include "standard.h"
11	schorsch	2.5	#include "platform.h"
12	greg	2.1	#include "octree.h"
13			#include "object.h"
14			#include "mesh.h"
15	schorsch	2.4	#include "resolu.h"
16	greg	2.1
17			static char meshfn; / input file name */
18			static FILE meshfp; / mesh file pointer */
19			static int objsize; /* sizeof(OBJECT) from writer */
20
21
22			static void
23			mesherror(etyp, msg) /* mesh read error */
24			int etyp;
25			char *msg;
26			{
27			char msgbuf[128];
28
29			sprintf(msgbuf, "(%s): %s", meshfn, msg);
30			error(etyp, msgbuf);
31			}
32
33
34			static long
35			mgetint(siz) /* get a siz-byte integer */
36			int siz;
37			{
38			register long r;
39
40			r = getint(siz, meshfp);
41			if (feof(meshfp))
42			mesherror(USER, "truncated mesh file");
43			return(r);
44			}
45
46
47			static double
48			mgetflt() /* get a floating point number */
49			{
50			double r;
51
52			r = getflt(meshfp);
53			if (feof(meshfp))
54			mesherror(USER, "truncated mesh file");
55			return(r);
56			}
57
58
59			static OCTREE
60			getfullnode() /* get a set, return fullnode */
61			{
62			OBJECT set[MAXSET+1];
63			register int i;
64
65			if ((set[0] = mgetint(objsize)) > MAXSET)
66			mesherror(USER, "bad set in getfullnode");
67			for (i = 1; i <= set[0]; i++)
68			set[i] = mgetint(objsize);
69			return(fullnode(set));
70			}
71
72
73			static OCTREE
74			gettree() /* get a pre-ordered octree */
75			{
76			register OCTREE ot;
77			register int i;
78
79			switch (getc(meshfp)) {
80	schorsch	2.4	case OT_EMPTY:
81			return(EMPTY);
82			case OT_FULL:
83			return(getfullnode());
84			case OT_TREE:
85			if ((ot = octalloc()) == EMPTY)
86			mesherror(SYSTEM, "out of tree space in readmesh");
87			for (i = 0; i < 8; i++)
88			octkid(ot, i) = gettree();
89			return(ot);
90			case EOF:
91			mesherror(USER, "truncated mesh octree");
92			default:
93			mesherror(USER, "damaged mesh octree");
94	greg	2.1	}
95	schorsch	2.8	return (OCTREE)NULL; /* pro forma return */
96	greg	2.1	}
97
98
99			static void
100			skiptree() /* skip octree on input */
101			{
102			register int i;
103
104			switch (getc(meshfp)) {
105			case OT_EMPTY:
106			return;
107			case OT_FULL:
108			for (i = mgetint(objsize)*objsize; i-- > 0; )
109			if (getc(meshfp) == EOF)
110			mesherror(USER, "truncated mesh octree");
111			return;
112			case OT_TREE:
113			for (i = 0; i < 8; i++)
114			skiptree();
115			return;
116			case EOF:
117			mesherror(USER, "truncated mesh octree");
118			default:
119			mesherror(USER, "damaged mesh octree");
120			}
121			}
122
123
124			static void
125			getpatch(pp) /* load a mesh patch */
126			register MESHPATCH *pp;
127			{
128			int flags;
129			int i, j;
130			/* vertex flags */
131			flags = mgetint(1);
132			if (!(flags & MT_V) \|\| flags & ~(MT_V\|MT_N\|MT_UV))
133			mesherror(USER, "bad patch flags");
134			/* allocate vertices */
135			pp->nverts = mgetint(2);
136			if (pp->nverts <= 0 \|\| pp->nverts > 256)
137			mesherror(USER, "bad number of patch vertices");
138	greg	2.6	pp->xyz = (uint32 ()[3])malloc(pp->nverts3*sizeof(uint32));
139	greg	2.1	if (pp->xyz == NULL)
140			goto nomem;
141			if (flags & MT_N) {
142	greg	2.6	pp->norm = (int32 *)calloc(pp->nverts, sizeof(int32));
143	greg	2.1	if (pp->norm == NULL)
144			goto nomem;
145			} else
146			pp->norm = NULL;
147			if (flags & MT_UV) {
148	greg	2.9	pp->uv = (uint16 ()[2])calloc(pp->nverts, 2sizeof(uint16));
149	greg	2.1	if (pp->uv == NULL)
150			goto nomem;
151			} else
152			pp->uv = NULL;
153			/* vertex xyz locations */
154			for (i = 0; i < pp->nverts; i++)
155			for (j = 0; j < 3; j++)
156			pp->xyz[i][j] = mgetint(4);
157			/* vertex normals */
158			if (flags & MT_N)
159			for (i = 0; i < pp->nverts; i++)
160			pp->norm[i] = mgetint(4);
161			/* uv coordinates */
162			if (flags & MT_UV)
163			for (i = 0; i < pp->nverts; i++)
164			for (j = 0; j < 2; j++)
165	greg	2.9	pp->uv[i][j] = mgetint(2);
166	greg	2.1	/* local triangles */
167			pp->ntris = mgetint(2);
168			if (pp->ntris < 0 \|\| pp->ntris > 512)
169			mesherror(USER, "bad number of local triangles");
170			if (pp->ntris) {
171			pp->tri = (struct PTri )malloc(pp->ntris
172			sizeof(struct PTri));
173			if (pp->tri == NULL)
174			goto nomem;
175			for (i = 0; i < pp->ntris; i++) {
176			pp->tri[i].v1 = mgetint(1);
177			pp->tri[i].v2 = mgetint(1);
178			pp->tri[i].v3 = mgetint(1);
179			}
180			} else
181			pp->tri = NULL;
182	greg	2.2	/* local triangle material(s) */
183			if (mgetint(2) > 1) {
184	greg	2.6	pp->trimat = (int16 )malloc(pp->ntrissizeof(int16));
185	greg	2.2	if (pp->trimat == NULL)
186			goto nomem;
187			for (i = 0; i < pp->ntris; i++)
188			pp->trimat[i] = mgetint(2);
189			} else {
190			pp->solemat = mgetint(2);
191			pp->trimat = NULL;
192			}
193	greg	2.1	/* joiner triangles */
194			pp->nj1tris = mgetint(2);
195			if (pp->nj1tris < 0 \|\| pp->nj1tris > 512)
196			mesherror(USER, "bad number of joiner triangles");
197			if (pp->nj1tris) {
198			pp->j1tri = (struct PJoin1 )malloc(pp->nj1tris
199			sizeof(struct PJoin1));
200			if (pp->j1tri == NULL)
201			goto nomem;
202			for (i = 0; i < pp->nj1tris; i++) {
203			pp->j1tri[i].v1j = mgetint(4);
204			pp->j1tri[i].v2 = mgetint(1);
205			pp->j1tri[i].v3 = mgetint(1);
206	greg	2.2	pp->j1tri[i].mat = mgetint(2);
207	greg	2.1	}
208			} else
209			pp->j1tri = NULL;
210			/* double joiner triangles */
211			pp->nj2tris = mgetint(2);
212			if (pp->nj2tris < 0 \|\| pp->nj2tris > 256)
213			mesherror(USER, "bad number of double joiner triangles");
214			if (pp->nj2tris) {
215			pp->j2tri = (struct PJoin2 )malloc(pp->nj2tris
216			sizeof(struct PJoin2));
217			if (pp->j2tri == NULL)
218			goto nomem;
219			for (i = 0; i < pp->nj2tris; i++) {
220			pp->j2tri[i].v1j = mgetint(4);
221			pp->j2tri[i].v2j = mgetint(4);
222			pp->j2tri[i].v3 = mgetint(1);
223	greg	2.2	pp->j2tri[i].mat = mgetint(2);
224	greg	2.1	}
225			} else
226			pp->j2tri = NULL;
227			return;
228			nomem:
229			error(SYSTEM, "out of mesh memory in getpatch");
230			}
231
232
233			void
234			readmesh(mp, path, flags) /* read in mesh structures */
235			MESH *mp;
236			char *path;
237			int flags;
238			{
239	greg	2.2	char *err;
240	greg	2.1	char sbuf[64];
241			int i;
242			/* check what's loaded */
243			flags &= (IO_INFO\|IO_BOUNDS\|IO_TREE\|IO_SCENE) & ~mp->ldflags;
244			/* open input file */
245			if (path == NULL) {
246			meshfn = "standard input";
247			meshfp = stdin;
248			} else if ((meshfp = fopen(meshfn=path, "r")) == NULL) {
249			sprintf(errmsg, "cannot open mesh file \"%s\"", path);
250			error(SYSTEM, errmsg);
251			}
252	schorsch	2.3	SET_FILE_BINARY(meshfp);
253	greg	2.1	/* read header */
254			checkheader(meshfp, MESHFMT, flags&IO_INFO ? stdout : (FILE *)NULL);
255			/* read format number */
256			objsize = getint(2, meshfp) - MESHMAGIC;
257			if (objsize <= 0 \|\| objsize > MAXOBJSIZ \|\| objsize > sizeof(long))
258			mesherror(USER, "incompatible mesh format");
259			/* read boundaries */
260			if (flags & IO_BOUNDS) {
261			for (i = 0; i < 3; i++)
262			mp->mcube.cuorg[i] = atof(getstr(sbuf, meshfp));
263			mp->mcube.cusize = atof(getstr(sbuf, meshfp));
264			for (i = 0; i < 2; i++) {
265			mp->uvlim[0][i] = mgetflt();
266			mp->uvlim[1][i] = mgetflt();
267			}
268			} else {
269			for (i = 0; i < 4; i++)
270			getstr(sbuf, meshfp);
271			for (i = 0; i < 4; i++)
272			mgetflt();
273			}
274			/* read the octree */
275			if (flags & IO_TREE)
276			mp->mcube.cutree = gettree();
277			else if (flags & IO_SCENE)
278			skiptree();
279	greg	2.2	/* read materials and patches */
280	greg	2.1	if (flags & IO_SCENE) {
281	greg	2.2	mp->mat0 = nobjects;
282			readscene(meshfp, objsize);
283			mp->nmats = nobjects - mp->mat0;
284	greg	2.1	mp->npatches = mgetint(4);
285			mp->patch = (MESHPATCH *)calloc(mp->npatches,
286			sizeof(MESHPATCH));
287			if (mp->patch == NULL)
288			mesherror(SYSTEM, "out of patch memory");
289			for (i = 0; i < mp->npatches; i++)
290			getpatch(&mp->patch[i]);
291			}
292			/* clean up */
293			fclose(meshfp);
294			mp->ldflags \|= flags;
295	greg	2.2	/* verify data */
296			if ((err = checkmesh(mp)) != NULL)
297			mesherror(USER, err);
298	greg	2.1	}