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#ifndef lint
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static const char RCSid[] = "$Id: readmesh.c,v 2.10 2003/10/22 02:06:34 greg Exp $";
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#endif
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/*
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* Routines for reading a compiled mesh from a file
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*/
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#include <time.h>
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#include "platform.h"
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#include "standard.h"
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#include "octree.h"
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#include "object.h"
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#include "mesh.h"
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#include "resolu.h"
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static char *meshfn; /* input file name */
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static FILE *meshfp; /* mesh file pointer */
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static int objsize; /* sizeof(OBJECT) from writer */
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static void
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mesherror(etyp, msg) /* mesh read error */
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int etyp;
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char *msg;
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{
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char msgbuf[128];
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sprintf(msgbuf, "(%s): %s", meshfn, msg);
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error(etyp, msgbuf);
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}
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static long
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mgetint(siz) /* get a siz-byte integer */
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int siz;
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{
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register long r;
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r = getint(siz, meshfp);
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if (feof(meshfp))
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mesherror(USER, "truncated mesh file");
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return(r);
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}
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static double
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mgetflt() /* get a floating point number */
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{
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double r;
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r = getflt(meshfp);
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if (feof(meshfp))
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mesherror(USER, "truncated mesh file");
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return(r);
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}
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static OCTREE
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getfullnode() /* get a set, return fullnode */
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{
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OBJECT set[MAXSET+1];
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register int i;
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if ((set[0] = mgetint(objsize)) > MAXSET)
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mesherror(USER, "bad set in getfullnode");
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for (i = 1; i <= set[0]; i++)
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set[i] = mgetint(objsize);
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return(fullnode(set));
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}
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static OCTREE
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gettree() /* get a pre-ordered octree */
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{
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register OCTREE ot;
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register int i;
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switch (getc(meshfp)) {
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case OT_EMPTY:
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return(EMPTY);
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case OT_FULL:
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return(getfullnode());
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case OT_TREE:
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if ((ot = octalloc()) == EMPTY)
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mesherror(SYSTEM, "out of tree space in readmesh");
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for (i = 0; i < 8; i++)
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octkid(ot, i) = gettree();
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return(ot);
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case EOF:
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mesherror(USER, "truncated mesh octree");
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default:
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mesherror(USER, "damaged mesh octree");
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}
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return (OCTREE)NULL; /* pro forma return */
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}
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static void
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skiptree() /* skip octree on input */
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{
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register int i;
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switch (getc(meshfp)) {
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case OT_EMPTY:
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return;
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case OT_FULL:
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for (i = mgetint(objsize)*objsize; i-- > 0; )
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if (getc(meshfp) == EOF)
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mesherror(USER, "truncated mesh octree");
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return;
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case OT_TREE:
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for (i = 0; i < 8; i++)
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skiptree();
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return;
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case EOF:
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mesherror(USER, "truncated mesh octree");
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default:
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mesherror(USER, "damaged mesh octree");
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}
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}
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static void
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getpatch(pp) /* load a mesh patch */
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register MESHPATCH *pp;
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{
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int flags;
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int i, j;
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/* vertex flags */
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flags = mgetint(1);
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if (!(flags & MT_V) || flags & ~(MT_V|MT_N|MT_UV))
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mesherror(USER, "bad patch flags");
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/* allocate vertices */
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pp->nverts = mgetint(2);
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if (pp->nverts <= 0 || pp->nverts > 256)
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mesherror(USER, "bad number of patch vertices");
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pp->xyz = (uint32 (*)[3])malloc(pp->nverts*3*sizeof(uint32));
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if (pp->xyz == NULL)
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goto nomem;
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if (flags & MT_N) {
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pp->norm = (int32 *)calloc(pp->nverts, sizeof(int32));
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if (pp->norm == NULL)
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goto nomem;
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} else
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pp->norm = NULL;
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if (flags & MT_UV) {
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pp->uv = (uint32 (*)[2])calloc(pp->nverts, 2*sizeof(uint32));
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if (pp->uv == NULL)
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goto nomem;
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} else
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pp->uv = NULL;
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/* vertex xyz locations */
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for (i = 0; i < pp->nverts; i++)
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for (j = 0; j < 3; j++)
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pp->xyz[i][j] = mgetint(4);
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/* vertex normals */
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if (flags & MT_N)
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for (i = 0; i < pp->nverts; i++)
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pp->norm[i] = mgetint(4);
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/* uv coordinates */
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if (flags & MT_UV)
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for (i = 0; i < pp->nverts; i++)
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for (j = 0; j < 2; j++)
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pp->uv[i][j] = mgetint(4);
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/* local triangles */
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pp->ntris = mgetint(2);
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if (pp->ntris < 0 || pp->ntris > 512)
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mesherror(USER, "bad number of local triangles");
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if (pp->ntris) {
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pp->tri = (struct PTri *)malloc(pp->ntris *
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sizeof(struct PTri));
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if (pp->tri == NULL)
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goto nomem;
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for (i = 0; i < pp->ntris; i++) {
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pp->tri[i].v1 = mgetint(1);
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pp->tri[i].v2 = mgetint(1);
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pp->tri[i].v3 = mgetint(1);
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}
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} else
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pp->tri = NULL;
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/* local triangle material(s) */
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if (mgetint(2) > 1) {
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pp->trimat = (int16 *)malloc(pp->ntris*sizeof(int16));
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if (pp->trimat == NULL)
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goto nomem;
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for (i = 0; i < pp->ntris; i++)
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pp->trimat[i] = mgetint(2);
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} else {
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pp->solemat = mgetint(2);
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pp->trimat = NULL;
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}
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/* joiner triangles */
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pp->nj1tris = mgetint(2);
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if (pp->nj1tris < 0 || pp->nj1tris > 512)
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mesherror(USER, "bad number of joiner triangles");
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if (pp->nj1tris) {
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pp->j1tri = (struct PJoin1 *)malloc(pp->nj1tris *
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sizeof(struct PJoin1));
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if (pp->j1tri == NULL)
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goto nomem;
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for (i = 0; i < pp->nj1tris; i++) {
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pp->j1tri[i].v1j = mgetint(4);
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pp->j1tri[i].v2 = mgetint(1);
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pp->j1tri[i].v3 = mgetint(1);
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pp->j1tri[i].mat = mgetint(2);
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}
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} else
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pp->j1tri = NULL;
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/* double joiner triangles */
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pp->nj2tris = mgetint(2);
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if (pp->nj2tris < 0 || pp->nj2tris > 256)
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mesherror(USER, "bad number of double joiner triangles");
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if (pp->nj2tris) {
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pp->j2tri = (struct PJoin2 *)malloc(pp->nj2tris *
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sizeof(struct PJoin2));
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if (pp->j2tri == NULL)
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goto nomem;
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for (i = 0; i < pp->nj2tris; i++) {
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pp->j2tri[i].v1j = mgetint(4);
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pp->j2tri[i].v2j = mgetint(4);
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pp->j2tri[i].v3 = mgetint(1);
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pp->j2tri[i].mat = mgetint(2);
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}
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} else
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pp->j2tri = NULL;
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return;
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nomem:
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error(SYSTEM, "out of mesh memory in getpatch");
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}
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void
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readmesh(mp, path, flags) /* read in mesh structures */
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MESH *mp;
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char *path;
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int flags;
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{
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char *err;
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char sbuf[64];
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int i;
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/* check what's loaded */
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flags &= (IO_INFO|IO_BOUNDS|IO_TREE|IO_SCENE) & ~mp->ldflags;
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/* open input file */
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if (path == NULL) {
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meshfn = "standard input";
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meshfp = stdin;
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} else if ((meshfp = fopen(meshfn=path, "r")) == NULL) {
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sprintf(errmsg, "cannot open mesh file \"%s\"", path);
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error(SYSTEM, errmsg);
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}
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SET_FILE_BINARY(meshfp);
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/* read header */
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checkheader(meshfp, MESHFMT, flags&IO_INFO ? stdout : (FILE *)NULL);
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/* read format number */
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objsize = getint(2, meshfp) - MESHMAGIC;
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if (objsize <= 0 || objsize > MAXOBJSIZ || objsize > sizeof(long))
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mesherror(USER, "incompatible mesh format");
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/* read boundaries */
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if (flags & IO_BOUNDS) {
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for (i = 0; i < 3; i++)
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mp->mcube.cuorg[i] = atof(getstr(sbuf, meshfp));
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mp->mcube.cusize = atof(getstr(sbuf, meshfp));
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for (i = 0; i < 2; i++) {
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mp->uvlim[0][i] = mgetflt();
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mp->uvlim[1][i] = mgetflt();
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}
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} else {
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for (i = 0; i < 4; i++)
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getstr(sbuf, meshfp);
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for (i = 0; i < 4; i++)
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mgetflt();
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}
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/* read the octree */
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if (flags & IO_TREE)
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mp->mcube.cutree = gettree();
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else if (flags & IO_SCENE)
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skiptree();
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/* read materials and patches */
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if (flags & IO_SCENE) {
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mp->mat0 = nobjects;
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readscene(meshfp, objsize);
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mp->nmats = nobjects - mp->mat0;
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mp->npatches = mgetint(4);
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mp->patch = (MESHPATCH *)calloc(mp->npatches,
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sizeof(MESHPATCH));
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if (mp->patch == NULL)
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mesherror(SYSTEM, "out of patch memory");
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for (i = 0; i < mp->npatches; i++)
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getpatch(&mp->patch[i]);
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}
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/* clean up */
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fclose(meshfp);
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mp->ldflags |= flags;
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/* verify data */
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if ((err = checkmesh(mp)) != NULL)
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mesherror(USER, err);
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}
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