src/common/mesh.c

#ifndef lint
static const char RCSid[] = "$Id: mesh.c,v 2.18 2004/03/16 19:56:27 greg Exp $";
#endif
/*
 * Mesh support routines
 */

#include <string.h>

#include "rtio.h"
#include "rtmath.h"
#include "rterror.h"
#include "paths.h"
#include "octree.h"
#include "object.h"
#include "otypes.h"
#include "mesh.h"

/* An encoded mesh vertex */
typedef struct {
        int             fl;
        uint32          xyz[3];
        int32           norm;
        uint32          uv[2];
} MCVERT;

#define  MPATCHBLKSIZ   128             /* patch allocation block size */

#define  IO_LEGAL       (IO_BOUNDS|IO_TREE|IO_SCENE)

static MESH     *mlist = NULL;          /* list of loaded meshes */

static lut_keycmpf_t cvcmp;
static lut_hashf_t cvhash;


static unsigned long
cvhash(p)                               /* hash an encoded vertex */
//MCVERT        *cvp;
void    *p;
{
        MCVERT  *cvp = p;
        unsigned long   hval;
        
        if (!(cvp->fl & MT_V))
                return(0);
        hval = cvp->xyz[0] ^ cvp->xyz[1] << 11 ^ cvp->xyz[2] << 22;
        if (cvp->fl & MT_N)
                hval ^= cvp->norm;
        if (cvp->fl & MT_UV)
                hval ^= cvp->uv[0] ^ cvp->uv[1] << 16;
        return(hval);
}


static int
cvcmp(vv1, vv2)                         /* compare encoded vertices */
//register MCVERT       *v1, *v2;
const void      *vv1, *vv2;
{
        const MCVERT    *v1 = vv1, *v2 = vv2;
        if (v1->fl != v2->fl)
                return(1);
        if (v1->xyz[0] != v2->xyz[0])
                return(1);
        if (v1->xyz[1] != v2->xyz[1])
                return(1);
        if (v1->xyz[2] != v2->xyz[2])
                return(1);
        if (v1->fl & MT_N && v1->norm != v2->norm)
                return(1);
        if (v1->fl & MT_UV) {
                if (v1->uv[0] != v2->uv[0])
                        return(1);
                if (v1->uv[1] != v2->uv[1])
                        return(1);
        }
        return(0);
}


MESH *
getmesh(mname, flags)                   /* get new mesh data reference */
char    *mname;
int     flags;
{
        char  *pathname;
        register MESH  *ms;

        flags &= IO_LEGAL;
        for (ms = mlist; ms != NULL; ms = ms->next)
                if (!strcmp(mname, ms->name)) {
                        ms->nref++;     /* increase reference count */
                        break;
                }
        if (ms == NULL) {               /* load first time */
                ms = (MESH *)calloc(1, sizeof(MESH));
                if (ms == NULL)
                        error(SYSTEM, "out of memory in getmesh");
                ms->name = savestr(mname);
                ms->nref = 1;
                ms->mcube.cutree = EMPTY;
                ms->next = mlist;
                mlist = ms;
        }
        if ((pathname = getpath(mname, getrlibpath(), R_OK)) == NULL) {
                sprintf(errmsg, "cannot find mesh file \"%s\"", mname);
                error(USER, errmsg);
        }
        flags &= ~ms->ldflags;
        if (flags)
                readmesh(ms, pathname, flags);
        return(ms);
}


MESHINST *
getmeshinst(o, flags)                   /* create mesh instance */
OBJREC  *o;
int     flags;
{
        register MESHINST  *ins;

        flags &= IO_LEGAL;
        if ((ins = (MESHINST *)o->os) == NULL) {
                if ((ins = (MESHINST *)malloc(sizeof(MESHINST))) == NULL)
                        error(SYSTEM, "out of memory in getmeshinst");
                if (o->oargs.nsargs < 1)
                        objerror(o, USER, "bad # of arguments");
                if (fullxf(&ins->x, o->oargs.nsargs-1,
                                o->oargs.sarg+1) != o->oargs.nsargs-1)
                        objerror(o, USER, "bad transform");
                if (ins->x.f.sca < 0.0) {
                        ins->x.f.sca = -ins->x.f.sca;
                        ins->x.b.sca = -ins->x.b.sca;
                }
                ins->msh = NULL;
                o->os = (char *)ins;
        }
        if (ins->msh == NULL)
                ins->msh = getmesh(o->oargs.sarg[0], flags);
        else if ((flags &= ~ins->msh->ldflags))
                readmesh(ins->msh,
                        getpath(o->oargs.sarg[0], getrlibpath(), R_OK),
                                flags);
        return(ins);
}


int
getmeshtrivid(tvid, mo, mp, ti)         /* get triangle vertex ID's */
int32   tvid[3];
OBJECT  *mo;
MESH    *mp;
OBJECT  ti;
{
        int             pn = ti >> 10;
        MESHPATCH       *pp;

        if (pn >= mp->npatches)
                return(0);
        pp = &mp->patch[pn];
        ti &= 0x3ff;
        if (!(ti & 0x200)) {            /* local triangle */
                struct PTri     *tp;
                if (ti >= pp->ntris)
                        return(0);
                tp = &pp->tri[ti];
                tvid[0] = tvid[1] = tvid[2] = pn << 8;
                tvid[0] |= tp->v1;
                tvid[1] |= tp->v2;
                tvid[2] |= tp->v3;
                if (pp->trimat != NULL)
                        *mo = pp->trimat[ti];
                else
                        *mo = pp->solemat;
                if (*mo != OVOID)
                        *mo += mp->mat0;
                return(1);
        }
        ti &= ~0x200;
        if (!(ti & 0x100)) {            /* single link vertex */
                struct PJoin1   *tp1;
                if (ti >= pp->nj1tris)
                        return(0);
                tp1 = &pp->j1tri[ti];
                tvid[0] = tp1->v1j;
                tvid[1] = tvid[2] = pn << 8;
                tvid[1] |= tp1->v2;
                tvid[2] |= tp1->v3;
                if ((*mo = tp1->mat) != OVOID)
                        *mo += mp->mat0;
                return(1);
        }
        ti &= ~0x100;
        {                               /* double link vertex */
                struct PJoin2   *tp2;
                if (ti >= pp->nj2tris)
                        return(0);
                tp2 = &pp->j2tri[ti];
                tvid[0] = tp2->v1j;
                tvid[1] = tp2->v2j;
                tvid[2] = pn << 8 | tp2->v3;
                if ((*mo = tp2->mat) != OVOID)
                        *mo += mp->mat0;
        }
        return(1);
}


int
getmeshvert(vp, mp, vid, what)  /* get triangle vertex from ID */
MESHVERT        *vp;
MESH            *mp;
int32           vid;
int             what;
{
        int             pn = vid >> 8;
        MESHPATCH       *pp;
        double          vres;
        register int    i;
        
        vp->fl = 0;
        if (pn >= mp->npatches)
                return(0);
        pp = &mp->patch[pn];
        vid &= 0xff;
        if (vid >= pp->nverts)
                return(0);
                                        /* get location */
        if (what & MT_V) {
                vres = (1./4294967296.)*mp->mcube.cusize;
                for (i = 0; i < 3; i++)
                        vp->v[i] = mp->mcube.cuorg[i] +
                                        (pp->xyz[vid][i] + .5)*vres;
                vp->fl |= MT_V;
        }
                                        /* get normal */
        if (what & MT_N && pp->norm != NULL && pp->norm[vid]) {
                decodedir(vp->n, pp->norm[vid]);
                vp->fl |= MT_N;
        }
                                        /* get (u,v) */
        if (what & MT_UV && pp->uv != NULL && pp->uv[vid][0]) {
                for (i = 0; i < 2; i++)
                        vp->uv[i] = mp->uvlim[0][i] +
                                (mp->uvlim[1][i] - mp->uvlim[0][i])*
                                (pp->uv[vid][i] + .5)*(1./4294967296.);
                vp->fl |= MT_UV;
        }
        return(vp->fl);
}


OBJREC *
getmeshpseudo(mp, mo)           /* get mesh pseudo object for material */
MESH    *mp;
OBJECT  mo;
{
        if (mo < mp->mat0 || mo >= mp->mat0 + mp->nmats)
                error(INTERNAL, "modifier out of range in getmeshpseudo");
        if (mp->pseudo == NULL) {
                register int    i;
                mp->pseudo = (OBJREC *)calloc(mp->nmats, sizeof(OBJREC));
                if (mp->pseudo == NULL)
                        error(SYSTEM, "out of memory in getmeshpseudo");
                for (i = mp->nmats; i--; ) {
                        mp->pseudo[i].omod = mp->mat0 + i;
                        mp->pseudo[i].otype = OBJ_FACE;
                        mp->pseudo[i].oname = "M-Tri";
                }
        }
        return(&mp->pseudo[mo - mp->mat0]);
}


int
getmeshtri(tv, mo, mp, ti, wha) /* get triangle vertices */
MESHVERT        tv[3];
OBJECT          *mo;
MESH            *mp;
OBJECT          ti;
int             wha;
{
        int32   tvid[3];

        if (!getmeshtrivid(tvid, mo, mp, ti))
                return(0);

        getmeshvert(&tv[0], mp, tvid[0], wha);
        getmeshvert(&tv[1], mp, tvid[1], wha);
        getmeshvert(&tv[2], mp, tvid[2], wha);

        return(tv[0].fl & tv[1].fl & tv[2].fl);
}


int32
addmeshvert(mp, vp)             /* find/add a mesh vertex */
register MESH   *mp;
MESHVERT        *vp;
{
        LUENT           *lvp;
        MCVERT          cv;
        register int    i;

        if (!(vp->fl & MT_V))
                return(-1);
                                        /* encode vertex */
        for (i = 0; i < 3; i++) {
                if (vp->v[i] < mp->mcube.cuorg[i])
                        return(-1);
                if (vp->v[i] >= mp->mcube.cuorg[i] + mp->mcube.cusize)
                        return(-1);
                cv.xyz[i] = (uint32)(4294967296. *
                                (vp->v[i] - mp->mcube.cuorg[i]) /
                                mp->mcube.cusize);
        }
        if (vp->fl & MT_N)              /* assumes normalized! */
                cv.norm = encodedir(vp->n);
        if (vp->fl & MT_UV)
                for (i = 0; i < 2; i++) {
                        if (vp->uv[i] <= mp->uvlim[0][i])
                                return(-1);
                        if (vp->uv[i] >= mp->uvlim[1][i])
                                return(-1);
                        cv.uv[i] = (uint32)(4294967296. *
                                        (vp->uv[i] - mp->uvlim[0][i]) /
                                        (mp->uvlim[1][i] - mp->uvlim[0][i]));
                }
        cv.fl = vp->fl;
        if (mp->lut.tsiz == 0) {
                mp->lut.hashf = cvhash;
                mp->lut.keycmp = cvcmp;
                mp->lut.freek = free;
                if (!lu_init(&mp->lut, 50000))
                        goto nomem;
        }
                                        /* find entry */
        lvp = lu_find(&mp->lut, (char *)&cv);
        if (lvp == NULL)
                goto nomem;
        if (lvp->key == NULL) {
                lvp->key = (char *)malloc(sizeof(MCVERT)+sizeof(int32));
                memcpy((void *)lvp->key, (void *)&cv, sizeof(MCVERT));
        }
        if (lvp->data == NULL) {        /* new vertex */
                register MESHPATCH      *pp;
                if (mp->npatches <= 0) {
                        mp->patch = (MESHPATCH *)calloc(MPATCHBLKSIZ,
                                        sizeof(MESHPATCH));
                        if (mp->patch == NULL)
                                goto nomem;
                        mp->npatches = 1;
                } else if (mp->patch[mp->npatches-1].nverts >= 256) {
                        if (mp->npatches % MPATCHBLKSIZ == 0) {
                                mp->patch = (MESHPATCH *)realloc(
                                                (void *)mp->patch,
                                        (mp->npatches + MPATCHBLKSIZ)*
                                                sizeof(MESHPATCH));
                                memset((void *)(mp->patch + mp->npatches), '\0',
                                        MPATCHBLKSIZ*sizeof(MESHPATCH));
                        }
                        if (mp->npatches++ >= 1L<<22)
                                error(INTERNAL, "too many mesh patches");
                }
                pp = &mp->patch[mp->npatches-1];
                if (pp->xyz == NULL) {
                        pp->xyz = (uint32 (*)[3])calloc(256, 3*sizeof(int32));
                        if (pp->xyz == NULL)
                                goto nomem;
                }
                for (i = 0; i < 3; i++)
                        pp->xyz[pp->nverts][i] = cv.xyz[i];
                if (cv.fl & MT_N) {
                        if (pp->norm == NULL) {
                                pp->norm = (int32 *)calloc(256, sizeof(int32));
                                if (pp->norm == NULL)
                                        goto nomem;
                        }
                        pp->norm[pp->nverts] = cv.norm;
                }
                if (cv.fl & MT_UV) {
                        if (pp->uv == NULL) {
                                pp->uv = (uint32 (*)[2])calloc(256,
                                                2*sizeof(uint32));
                                if (pp->uv == NULL)
                                        goto nomem;
                        }
                        for (i = 0; i < 2; i++)
                                pp->uv[pp->nverts][i] = cv.uv[i];
                }
                pp->nverts++;
                lvp->data = lvp->key + sizeof(MCVERT);
                *(int32 *)lvp->data = (mp->npatches-1) << 8 | (pp->nverts-1);
        }
        return(*(int32 *)lvp->data);
nomem:
        error(SYSTEM, "out of memory in addmeshvert");
        return(-1);
}


OBJECT
addmeshtri(mp, tv, mo)          /* add a new mesh triangle */
MESH            *mp;
MESHVERT        tv[3];
OBJECT          mo;
{
        int32                   vid[3], t;
        int                     pn[3], i;
        register MESHPATCH      *pp;

        if (!(tv[0].fl & tv[1].fl & tv[2].fl & MT_V))
                return(OVOID);
                                /* find/allocate patch vertices */
        for (i = 0; i < 3; i++) {
                if ((vid[i] = addmeshvert(mp, &tv[i])) < 0)
                        return(OVOID);
                pn[i] = vid[i] >> 8;
        }
                                /* normalize material index */
        if (mo != OVOID) {
                if ((mo -= mp->mat0) >= mp->nmats)
                        mp->nmats = mo+1;
                else if (mo < 0)
                        error(INTERNAL, "modifier range error in addmeshtri");
        }
                                /* assign triangle */
        if (pn[0] == pn[1] && pn[1] == pn[2]) { /* local case */
                pp = &mp->patch[pn[0]];
                if (pp->tri == NULL) {
                        pp->tri = (struct PTri *)malloc(
                                        512*sizeof(struct PTri));
                        if (pp->tri == NULL)
                                goto nomem;
                }
                if (pp->ntris < 512) {
                        pp->tri[pp->ntris].v1 = vid[0] & 0xff;
                        pp->tri[pp->ntris].v2 = vid[1] & 0xff;
                        pp->tri[pp->ntris].v3 = vid[2] & 0xff;
                        if (pp->ntris == 0)
                                pp->solemat = mo;
                        else if (pp->trimat == NULL && mo != pp->solemat) {
                                pp->trimat = (int16 *)malloc(
                                                512*sizeof(int16));
                                if (pp->trimat == NULL)
                                        goto nomem;
                                for (i = pp->ntris; i--; )
                                        pp->trimat[i] = pp->solemat;
                        }
                        if (pp->trimat != NULL)
                                pp->trimat[pp->ntris] = mo;
                        return(pn[0] << 10 | pp->ntris++);
                }
        }
        if (pn[0] == pn[1]) {
                t = vid[2]; vid[2] = vid[1]; vid[1] = vid[0]; vid[0] = t;
                i = pn[2]; pn[2] = pn[1]; pn[1] = pn[0]; pn[0] = i;
        } else if (pn[0] == pn[2]) {
                t = vid[0]; vid[0] = vid[1]; vid[1] = vid[2]; vid[2] = t;
                i = pn[0]; pn[0] = pn[1]; pn[1] = pn[2]; pn[2] = i;
        }
        if (pn[1] == pn[2]) {                   /* single link */
                pp = &mp->patch[pn[1]];
                if (pp->j1tri == NULL) {
                        pp->j1tri = (struct PJoin1 *)malloc(
                                        256*sizeof(struct PJoin1));
                        if (pp->j1tri == NULL)
                                goto nomem;
                }
                if (pp->nj1tris < 256) {
                        pp->j1tri[pp->nj1tris].v1j = vid[0];
                        pp->j1tri[pp->nj1tris].v2 = vid[1] & 0xff;
                        pp->j1tri[pp->nj1tris].v3 = vid[2] & 0xff;
                        pp->j1tri[pp->nj1tris].mat = mo;
                        return(pn[1] << 10 | 0x200 | pp->nj1tris++);
                }
        }
                                                /* double link */
        pp = &mp->patch[pn[2]];
        if (pp->j2tri == NULL) {
                pp->j2tri = (struct PJoin2 *)malloc(
                                        256*sizeof(struct PJoin2));
                if (pp->j2tri == NULL)
                        goto nomem;
        }
        if (pp->nj2tris >= 256)
                error(INTERNAL, "too many patch triangles in addmeshtri");
        pp->j2tri[pp->nj2tris].v1j = vid[0];
        pp->j2tri[pp->nj2tris].v2j = vid[1];
        pp->j2tri[pp->nj2tris].v3 = vid[2] & 0xff;
        pp->j2tri[pp->nj2tris].mat = mo;
        return(pn[2] << 10 | 0x300 | pp->nj2tris++);
nomem:
        error(SYSTEM, "out of memory in addmeshtri");
        return(OVOID);
}


char *
checkmesh(mp)                           /* validate mesh data */
register MESH   *mp;
{
        static char     embuf[128];
        int             nouvbounds = 1;
        register int    i;
                                        /* basic checks */
        if (mp == NULL)
                return("NULL mesh pointer");
        if (!mp->ldflags)
                return("unassigned mesh");
        if (mp->name == NULL)
                return("missing mesh name");
        if (mp->nref <= 0)
                return("unreferenced mesh");
                                        /* check boundaries */
        if (mp->ldflags & IO_BOUNDS) {
                if (mp->mcube.cusize <= FTINY)
                        return("illegal octree bounds in mesh");
                nouvbounds = (mp->uvlim[1][0] - mp->uvlim[0][0] <= FTINY ||
                                mp->uvlim[1][1] - mp->uvlim[0][1] <= FTINY);
        }
                                        /* check octree */
        if (mp->ldflags & IO_TREE) {
                if (isempty(mp->mcube.cutree))
                        error(WARNING, "empty mesh octree");
        }
                                        /* check scene data */
        if (mp->ldflags & IO_SCENE) {
                if (!(mp->ldflags & IO_BOUNDS))
                        return("unbounded scene in mesh");
                if (mp->mat0 < 0 || mp->mat0+mp->nmats > nobjects)
                        return("bad mesh modifier range");
                for (i = mp->mat0+mp->nmats; i-- > mp->mat0; ) {
                        int     otyp = objptr(i)->otype;
                        if (!ismodifier(otyp)) {
                                sprintf(embuf,
                                        "non-modifier in mesh (%s \"%s\")",
                                        ofun[otyp].funame, objptr(i)->oname);
                                return(embuf);
                        }
                }
                if (mp->npatches <= 0)
                        error(WARNING, "no patches in mesh");
                for (i = 0; i < mp->npatches; i++) {
                        register MESHPATCH      *pp = &mp->patch[i];
                        if (pp->nverts <= 0)
                                error(WARNING, "no vertices in patch");
                        else {
                                if (pp->xyz == NULL)
                                        return("missing patch vertex list");
                                if (nouvbounds && pp->uv != NULL)
                                        return("unreferenced uv coordinates");
                        }
                        if (pp->ntris > 0 && pp->tri == NULL)
                                return("missing patch triangle list");
                        if (pp->nj1tris > 0 && pp->j1tri == NULL)
                                return("missing patch joiner triangle list");
                        if (pp->nj2tris > 0 && pp->j2tri == NULL)
                                return("missing patch double-joiner list");
                }
        }
        return(NULL);                   /* seems OK */
}


static void
tallyoctree(ot, ecp, lcp, ocp)  /* tally octree size */
OCTREE  ot;
int     *ecp, *lcp, *ocp;
{
        int     i;

        if (isempty(ot)) {
                (*ecp)++;
                return;
        }
        if (isfull(ot)) {
                OBJECT  oset[MAXSET+1];
                (*lcp)++;
                objset(oset, ot);
                *ocp += oset[0];
                return;
        }
        for (i = 0; i < 8; i++)
                tallyoctree(octkid(ot, i), ecp, lcp, ocp);
}


void
printmeshstats(ms, fp)          /* print out mesh statistics */
MESH    *ms;
FILE    *fp;
{
        int     lfcnt=0, lecnt=0, locnt=0;
        int     vcnt=0, ncnt=0, uvcnt=0;
        int     nscnt=0, uvscnt=0;
        int     tcnt=0, t1cnt=0, t2cnt=0;
        int     i, j;
        
        tallyoctree(ms->mcube.cutree, &lecnt, &lfcnt, &locnt);
        for (i = 0; i < ms->npatches; i++) {
                register MESHPATCH      *pp = &ms->patch[i];
                vcnt += pp->nverts;
                if (pp->norm != NULL) {
                        for (j = pp->nverts; j--; )
                                if (pp->norm[j])
                                        ncnt++;
                        nscnt += pp->nverts;
                }
                if (pp->uv != NULL) {
                        for (j = pp->nverts; j--; )
                                if (pp->uv[j][0])
                                        uvcnt++;
                        uvscnt += pp->nverts;
                }
                tcnt += pp->ntris;
                t1cnt += pp->nj1tris;
                t2cnt += pp->nj2tris;
        }
        fprintf(fp, "Mesh statistics:\n");
        fprintf(fp, "\t%ld materials\n", ms->nmats);
        fprintf(fp, "\t%d patches (%.2f MBytes)\n", ms->npatches,
                        (ms->npatches*sizeof(MESHPATCH) +
                        vcnt*3*sizeof(uint32) +
                        nscnt*sizeof(int32) +
                        uvscnt*2*sizeof(uint32) +
                        tcnt*sizeof(struct PTri) +
                        t1cnt*sizeof(struct PJoin1) +
                        t2cnt*sizeof(struct PJoin2))/(1024.*1024.));
        fprintf(fp, "\t%d vertices (%.1f%% w/ normals, %.1f%% w/ uv)\n",
                        vcnt, 100.*ncnt/vcnt, 100.*uvcnt/vcnt);
        fprintf(fp, "\t%d triangles (%.1f%% local, %.1f%% joiner)\n",
                        tcnt+t1cnt+t2cnt,
                        100.*tcnt/(tcnt+t1cnt+t2cnt),
                        100.*t1cnt/(tcnt+t1cnt+t2cnt));
        fprintf(fp,
        "\t%d leaves in octree (%.1f%% empty, %.2f avg. set size)\n",
                        lfcnt+lecnt, 100.*lecnt/(lfcnt+lecnt),
                        (double)locnt/lfcnt);
}


void
freemesh(ms)                    /* free mesh data */
register MESH   *ms;
{
        MESH    mhead;
        MESH    *msp;
        
        if (ms == NULL)
                return;
        if (ms->nref <= 0)
                error(CONSISTENCY, "unreferenced mesh in freemesh");
        ms->nref--;
        if (ms->nref)           /* still in use */
                return;
                                /* else remove from list */
        mhead.next = mlist;
        for (msp = &mhead; msp->next != NULL; msp = msp->next)
                if (msp->next == ms) {
                        msp->next = ms->next;
                        ms->next = NULL;
                        break;
                }
        if (ms->next != NULL)   /* can't be in list anymore */
                error(CONSISTENCY, "unlisted mesh in freemesh");
        mlist = mhead.next;
                                /* free mesh data */
        freestr(ms->name);
        octfree(ms->mcube.cutree);
        lu_done(&ms->lut);
        if (ms->npatches > 0) {
                register MESHPATCH      *pp = ms->patch + ms->npatches;
                while (pp-- > ms->patch) {
                        if (pp->j2tri != NULL)
                                free((void *)pp->j2tri);
                        if (pp->j1tri != NULL)
                                free((void *)pp->j1tri);
                        if (pp->tri != NULL)
                                free((void *)pp->tri);
                        if (pp->uv != NULL)
                                free((void *)pp->uv);
                        if (pp->norm != NULL)
                                free((void *)pp->norm);
                        if (pp->xyz != NULL)
                                free((void *)pp->xyz);
                }
                free((void *)ms->patch);
        }
        if (ms->pseudo != NULL)
                free((void *)ms->pseudo);
        free((void *)ms);
}


void
freemeshinst(o)                 /* free mesh instance */
OBJREC  *o;
{
        if (o->os == NULL)
                return;
        freemesh((*(MESHINST *)o->os).msh);
        free((void *)o->os);
        o->os = NULL;
}
Revision:	2.19
Committed:	Sun Mar 28 20:33:12 2004 UTC (20 years, 1 month ago) by schorsch
Content type:	text/plain
Branch:	MAIN
Changes since 2.18:	+12 -5 lines
Log Message:	Continued ANSIfication, and other fixes and clarifications.
#	User	Rev	Content
1	greg	2.1	#ifndef lint
2	schorsch	2.19	static const char RCSid[] = "$Id: mesh.c,v 2.18 2004/03/16 19:56:27 greg Exp $";
3	greg	2.1	#endif
4			/*
5			* Mesh support routines
6			*/
7
8	schorsch	2.9	#include <string.h>
9
10	schorsch	2.15	#include "rtio.h"
11			#include "rtmath.h"
12			#include "rterror.h"
13	greg	2.17	#include "paths.h"
14	greg	2.1	#include "octree.h"
15			#include "object.h"
16	greg	2.4	#include "otypes.h"
17	greg	2.1	#include "mesh.h"
18
19			/* An encoded mesh vertex */
20			typedef struct {
21			int fl;
22	greg	2.8	uint32 xyz[3];
23			int32 norm;
24	greg	2.16	uint32 uv[2];
25	greg	2.1	} MCVERT;
26
27			#define MPATCHBLKSIZ 128 /* patch allocation block size */
28
29			#define IO_LEGAL (IO_BOUNDS\|IO_TREE\|IO_SCENE)
30
31			static MESH mlist = NULL; / list of loaded meshes */
32
33	schorsch	2.19	static lut_keycmpf_t cvcmp;
34			static lut_hashf_t cvhash;
35
36	greg	2.1
37			static unsigned long
38	schorsch	2.19	cvhash(p) /* hash an encoded vertex */
39			//MCVERT *cvp;
40			void *p;
41	greg	2.1	{
42	schorsch	2.19	MCVERT *cvp = p;
43	greg	2.1	unsigned long hval;
44
45			if (!(cvp->fl & MT_V))
46			return(0);
47			hval = cvp->xyz[0] ^ cvp->xyz[1] << 11 ^ cvp->xyz[2] << 22;
48			if (cvp->fl & MT_N)
49			hval ^= cvp->norm;
50			if (cvp->fl & MT_UV)
51			hval ^= cvp->uv[0] ^ cvp->uv[1] << 16;
52			return(hval);
53			}
54
55
56			static int
57	schorsch	2.19	cvcmp(vv1, vv2) /* compare encoded vertices */
58			//register MCVERT v1, v2;
59			const void vv1, vv2;
60	greg	2.1	{
61	schorsch	2.19	const MCVERT v1 = vv1, v2 = vv2;
62	greg	2.1	if (v1->fl != v2->fl)
63			return(1);
64			if (v1->xyz[0] != v2->xyz[0])
65			return(1);
66			if (v1->xyz[1] != v2->xyz[1])
67			return(1);
68			if (v1->xyz[2] != v2->xyz[2])
69			return(1);
70			if (v1->fl & MT_N && v1->norm != v2->norm)
71			return(1);
72			if (v1->fl & MT_UV) {
73			if (v1->uv[0] != v2->uv[0])
74			return(1);
75			if (v1->uv[1] != v2->uv[1])
76			return(1);
77			}
78			return(0);
79			}
80
81
82			MESH *
83	greg	2.10	getmesh(mname, flags) /* get new mesh data reference */
84	greg	2.1	char *mname;
85			int flags;
86			{
87			char *pathname;
88			register MESH *ms;
89
90			flags &= IO_LEGAL;
91			for (ms = mlist; ms != NULL; ms = ms->next)
92	greg	2.11	if (!strcmp(mname, ms->name)) {
93			ms->nref++; /* increase reference count */
94	greg	2.10	break;
95	greg	2.11	}
96	greg	2.10	if (ms == NULL) { /* load first time */
97	greg	2.1	ms = (MESH *)calloc(1, sizeof(MESH));
98			if (ms == NULL)
99			error(SYSTEM, "out of memory in getmesh");
100			ms->name = savestr(mname);
101	greg	2.11	ms->nref = 1;
102	greg	2.1	ms->mcube.cutree = EMPTY;
103			ms->next = mlist;
104			mlist = ms;
105			}
106	greg	2.7	if ((pathname = getpath(mname, getrlibpath(), R_OK)) == NULL) {
107	greg	2.1	sprintf(errmsg, "cannot find mesh file \"%s\"", mname);
108			error(USER, errmsg);
109			}
110			flags &= ~ms->ldflags;
111			if (flags)
112			readmesh(ms, pathname, flags);
113			return(ms);
114			}
115
116
117			MESHINST *
118			getmeshinst(o, flags) /* create mesh instance */
119			OBJREC *o;
120			int flags;
121			{
122			register MESHINST *ins;
123
124			flags &= IO_LEGAL;
125			if ((ins = (MESHINST *)o->os) == NULL) {
126			if ((ins = (MESHINST *)malloc(sizeof(MESHINST))) == NULL)
127			error(SYSTEM, "out of memory in getmeshinst");
128			if (o->oargs.nsargs < 1)
129			objerror(o, USER, "bad # of arguments");
130			if (fullxf(&ins->x, o->oargs.nsargs-1,
131			o->oargs.sarg+1) != o->oargs.nsargs-1)
132			objerror(o, USER, "bad transform");
133			if (ins->x.f.sca < 0.0) {
134			ins->x.f.sca = -ins->x.f.sca;
135			ins->x.b.sca = -ins->x.b.sca;
136			}
137			ins->msh = NULL;
138			o->os = (char *)ins;
139			}
140	greg	2.10	if (ins->msh == NULL)
141	greg	2.1	ins->msh = getmesh(o->oargs.sarg[0], flags);
142	greg	2.10	else if ((flags &= ~ins->msh->ldflags))
143			readmesh(ins->msh,
144			getpath(o->oargs.sarg[0], getrlibpath(), R_OK),
145			flags);
146	greg	2.1	return(ins);
147			}
148
149
150			int
151	greg	2.4	getmeshtrivid(tvid, mo, mp, ti) /* get triangle vertex ID's */
152	greg	2.8	int32 tvid[3];
153	greg	2.4	OBJECT *mo;
154			MESH *mp;
155			OBJECT ti;
156	greg	2.1	{
157			int pn = ti >> 10;
158	greg	2.4	MESHPATCH *pp;
159	greg	2.1
160			if (pn >= mp->npatches)
161			return(0);
162	greg	2.4	pp = &mp->patch[pn];
163	greg	2.1	ti &= 0x3ff;
164			if (!(ti & 0x200)) { /* local triangle */
165			struct PTri *tp;
166	greg	2.4	if (ti >= pp->ntris)
167	greg	2.1	return(0);
168	greg	2.4	tp = &pp->tri[ti];
169	greg	2.1	tvid[0] = tvid[1] = tvid[2] = pn << 8;
170			tvid[0] \|= tp->v1;
171			tvid[1] \|= tp->v2;
172			tvid[2] \|= tp->v3;
173	greg	2.4	if (pp->trimat != NULL)
174			*mo = pp->trimat[ti];
175			else
176			*mo = pp->solemat;
177			if (*mo != OVOID)
178			*mo += mp->mat0;
179	greg	2.1	return(1);
180			}
181			ti &= ~0x200;
182			if (!(ti & 0x100)) { /* single link vertex */
183			struct PJoin1 *tp1;
184	greg	2.4	if (ti >= pp->nj1tris)
185	greg	2.1	return(0);
186	greg	2.4	tp1 = &pp->j1tri[ti];
187	greg	2.1	tvid[0] = tp1->v1j;
188			tvid[1] = tvid[2] = pn << 8;
189			tvid[1] \|= tp1->v2;
190			tvid[2] \|= tp1->v3;
191	greg	2.4	if ((*mo = tp1->mat) != OVOID)
192			*mo += mp->mat0;
193	greg	2.1	return(1);
194			}
195			ti &= ~0x100;
196			{ /* double link vertex */
197			struct PJoin2 *tp2;
198	greg	2.4	if (ti >= pp->nj2tris)
199	greg	2.1	return(0);
200	greg	2.4	tp2 = &pp->j2tri[ti];
201	greg	2.1	tvid[0] = tp2->v1j;
202			tvid[1] = tp2->v2j;
203			tvid[2] = pn << 8 \| tp2->v3;
204	greg	2.4	if ((*mo = tp2->mat) != OVOID)
205			*mo += mp->mat0;
206	greg	2.1	}
207			return(1);
208			}
209
210
211			int
212			getmeshvert(vp, mp, vid, what) /* get triangle vertex from ID */
213	greg	2.6	MESHVERT *vp;
214			MESH *mp;
215	greg	2.8	int32 vid;
216	greg	2.6	int what;
217	greg	2.1	{
218			int pn = vid >> 8;
219			MESHPATCH *pp;
220			double vres;
221			register int i;
222
223			vp->fl = 0;
224			if (pn >= mp->npatches)
225			return(0);
226			pp = &mp->patch[pn];
227			vid &= 0xff;
228			if (vid >= pp->nverts)
229			return(0);
230			/* get location */
231			if (what & MT_V) {
232			vres = (1./4294967296.)*mp->mcube.cusize;
233			for (i = 0; i < 3; i++)
234			vp->v[i] = mp->mcube.cuorg[i] +
235			(pp->xyz[vid][i] + .5)*vres;
236			vp->fl \|= MT_V;
237			}
238			/* get normal */
239			if (what & MT_N && pp->norm != NULL && pp->norm[vid]) {
240			decodedir(vp->n, pp->norm[vid]);
241			vp->fl \|= MT_N;
242			}
243			/* get (u,v) */
244			if (what & MT_UV && pp->uv != NULL && pp->uv[vid][0]) {
245			for (i = 0; i < 2; i++)
246	greg	2.2	vp->uv[i] = mp->uvlim[0][i] +
247			(mp->uvlim[1][i] - mp->uvlim[0][i])*
248	greg	2.16	(pp->uv[vid][i] + .5)*(1./4294967296.);
249	greg	2.1	vp->fl \|= MT_UV;
250			}
251			return(vp->fl);
252			}
253
254
255	greg	2.4	OBJREC *
256			getmeshpseudo(mp, mo) /* get mesh pseudo object for material */
257			MESH *mp;
258			OBJECT mo;
259			{
260			if (mo < mp->mat0 \|\| mo >= mp->mat0 + mp->nmats)
261			error(INTERNAL, "modifier out of range in getmeshpseudo");
262			if (mp->pseudo == NULL) {
263			register int i;
264			mp->pseudo = (OBJREC *)calloc(mp->nmats, sizeof(OBJREC));
265			if (mp->pseudo == NULL)
266			error(SYSTEM, "out of memory in getmeshpseudo");
267			for (i = mp->nmats; i--; ) {
268			mp->pseudo[i].omod = mp->mat0 + i;
269			mp->pseudo[i].otype = OBJ_FACE;
270			mp->pseudo[i].oname = "M-Tri";
271			}
272			}
273			return(&mp->pseudo[mo - mp->mat0]);
274			}
275
276
277	greg	2.1	int
278	greg	2.4	getmeshtri(tv, mo, mp, ti, wha) /* get triangle vertices */
279	greg	2.1	MESHVERT tv[3];
280	greg	2.4	OBJECT *mo;
281	greg	2.1	MESH *mp;
282			OBJECT ti;
283	greg	2.4	int wha;
284	greg	2.1	{
285	greg	2.8	int32 tvid[3];
286	greg	2.1
287	greg	2.4	if (!getmeshtrivid(tvid, mo, mp, ti))
288	greg	2.1	return(0);
289
290	greg	2.4	getmeshvert(&tv[0], mp, tvid[0], wha);
291			getmeshvert(&tv[1], mp, tvid[1], wha);
292			getmeshvert(&tv[2], mp, tvid[2], wha);
293	greg	2.1
294			return(tv[0].fl & tv[1].fl & tv[2].fl);
295			}
296
297
298	greg	2.8	int32
299	greg	2.1	addmeshvert(mp, vp) /* find/add a mesh vertex */
300			register MESH *mp;
301			MESHVERT *vp;
302			{
303			LUENT *lvp;
304			MCVERT cv;
305			register int i;
306
307			if (!(vp->fl & MT_V))
308			return(-1);
309			/* encode vertex */
310			for (i = 0; i < 3; i++) {
311			if (vp->v[i] < mp->mcube.cuorg[i])
312			return(-1);
313			if (vp->v[i] >= mp->mcube.cuorg[i] + mp->mcube.cusize)
314			return(-1);
315	greg	2.8	cv.xyz[i] = (uint32)(4294967296. *
316	greg	2.1	(vp->v[i] - mp->mcube.cuorg[i]) /
317			mp->mcube.cusize);
318			}
319	greg	2.16	if (vp->fl & MT_N) /* assumes normalized! */
320	greg	2.1	cv.norm = encodedir(vp->n);
321			if (vp->fl & MT_UV)
322			for (i = 0; i < 2; i++) {
323	greg	2.2	if (vp->uv[i] <= mp->uvlim[0][i])
324	greg	2.1	return(-1);
325	greg	2.2	if (vp->uv[i] >= mp->uvlim[1][i])
326	greg	2.1	return(-1);
327	greg	2.16	cv.uv[i] = (uint32)(4294967296. *
328	greg	2.2	(vp->uv[i] - mp->uvlim[0][i]) /
329			(mp->uvlim[1][i] - mp->uvlim[0][i]));
330	greg	2.1	}
331			cv.fl = vp->fl;
332	greg	2.4	if (mp->lut.tsiz == 0) {
333			mp->lut.hashf = cvhash;
334			mp->lut.keycmp = cvcmp;
335			mp->lut.freek = free;
336			if (!lu_init(&mp->lut, 50000))
337	greg	2.1	goto nomem;
338			}
339			/* find entry */
340	greg	2.4	lvp = lu_find(&mp->lut, (char *)&cv);
341	greg	2.1	if (lvp == NULL)
342			goto nomem;
343			if (lvp->key == NULL) {
344	greg	2.8	lvp->key = (char *)malloc(sizeof(MCVERT)+sizeof(int32));
345	schorsch	2.9	memcpy((void )lvp->key, (void )&cv, sizeof(MCVERT));
346	greg	2.1	}
347			if (lvp->data == NULL) { /* new vertex */
348			register MESHPATCH *pp;
349			if (mp->npatches <= 0) {
350			mp->patch = (MESHPATCH *)calloc(MPATCHBLKSIZ,
351			sizeof(MESHPATCH));
352			if (mp->patch == NULL)
353			goto nomem;
354			mp->npatches = 1;
355			} else if (mp->patch[mp->npatches-1].nverts >= 256) {
356			if (mp->npatches % MPATCHBLKSIZ == 0) {
357			mp->patch = (MESHPATCH *)realloc(
358			(void *)mp->patch,
359			(mp->npatches + MPATCHBLKSIZ)*
360			sizeof(MESHPATCH));
361	schorsch	2.9	memset((void *)(mp->patch + mp->npatches), '\0',
362	greg	2.1	MPATCHBLKSIZ*sizeof(MESHPATCH));
363			}
364	greg	2.2	if (mp->npatches++ >= 1L<<22)
365	greg	2.1	error(INTERNAL, "too many mesh patches");
366			}
367			pp = &mp->patch[mp->npatches-1];
368			if (pp->xyz == NULL) {
369	greg	2.8	pp->xyz = (uint32 ()[3])calloc(256, 3sizeof(int32));
370	greg	2.1	if (pp->xyz == NULL)
371			goto nomem;
372			}
373			for (i = 0; i < 3; i++)
374			pp->xyz[pp->nverts][i] = cv.xyz[i];
375			if (cv.fl & MT_N) {
376			if (pp->norm == NULL) {
377	greg	2.8	pp->norm = (int32 *)calloc(256, sizeof(int32));
378	greg	2.1	if (pp->norm == NULL)
379			goto nomem;
380			}
381			pp->norm[pp->nverts] = cv.norm;
382			}
383			if (cv.fl & MT_UV) {
384			if (pp->uv == NULL) {
385	greg	2.16	pp->uv = (uint32 (*)[2])calloc(256,
386			2*sizeof(uint32));
387	greg	2.1	if (pp->uv == NULL)
388			goto nomem;
389			}
390			for (i = 0; i < 2; i++)
391			pp->uv[pp->nverts][i] = cv.uv[i];
392			}
393			pp->nverts++;
394			lvp->data = lvp->key + sizeof(MCVERT);
395	greg	2.8	(int32 )lvp->data = (mp->npatches-1) << 8 \| (pp->nverts-1);
396	greg	2.1	}
397	greg	2.8	return((int32 )lvp->data);
398	greg	2.1	nomem:
399			error(SYSTEM, "out of memory in addmeshvert");
400			return(-1);
401			}
402
403
404			OBJECT
405	greg	2.4	addmeshtri(mp, tv, mo) /* add a new mesh triangle */
406	greg	2.1	MESH *mp;
407			MESHVERT tv[3];
408	greg	2.4	OBJECT mo;
409	greg	2.1	{
410	greg	2.8	int32 vid[3], t;
411	greg	2.1	int pn[3], i;
412			register MESHPATCH *pp;
413
414			if (!(tv[0].fl & tv[1].fl & tv[2].fl & MT_V))
415			return(OVOID);
416			/* find/allocate patch vertices */
417			for (i = 0; i < 3; i++) {
418			if ((vid[i] = addmeshvert(mp, &tv[i])) < 0)
419			return(OVOID);
420			pn[i] = vid[i] >> 8;
421			}
422	greg	2.4	/* normalize material index */
423	schorsch	2.13	if (mo != OVOID) {
424	greg	2.4	if ((mo -= mp->mat0) >= mp->nmats)
425			mp->nmats = mo+1;
426			else if (mo < 0)
427			error(INTERNAL, "modifier range error in addmeshtri");
428	schorsch	2.13	}
429	greg	2.1	/* assign triangle */
430			if (pn[0] == pn[1] && pn[1] == pn[2]) { /* local case */
431			pp = &mp->patch[pn[0]];
432			if (pp->tri == NULL) {
433			pp->tri = (struct PTri *)malloc(
434			512*sizeof(struct PTri));
435			if (pp->tri == NULL)
436			goto nomem;
437			}
438	greg	2.2	if (pp->ntris < 512) {
439			pp->tri[pp->ntris].v1 = vid[0] & 0xff;
440			pp->tri[pp->ntris].v2 = vid[1] & 0xff;
441			pp->tri[pp->ntris].v3 = vid[2] & 0xff;
442	greg	2.4	if (pp->ntris == 0)
443			pp->solemat = mo;
444			else if (pp->trimat == NULL && mo != pp->solemat) {
445	greg	2.8	pp->trimat = (int16 *)malloc(
446			512*sizeof(int16));
447	greg	2.4	if (pp->trimat == NULL)
448			goto nomem;
449			for (i = pp->ntris; i--; )
450			pp->trimat[i] = pp->solemat;
451			}
452			if (pp->trimat != NULL)
453			pp->trimat[pp->ntris] = mo;
454	greg	2.2	return(pn[0] << 10 \| pp->ntris++);
455			}
456	greg	2.1	}
457			if (pn[0] == pn[1]) {
458	greg	2.2	t = vid[2]; vid[2] = vid[1]; vid[1] = vid[0]; vid[0] = t;
459			i = pn[2]; pn[2] = pn[1]; pn[1] = pn[0]; pn[0] = i;
460	greg	2.1	} else if (pn[0] == pn[2]) {
461	greg	2.2	t = vid[0]; vid[0] = vid[1]; vid[1] = vid[2]; vid[2] = t;
462			i = pn[0]; pn[0] = pn[1]; pn[1] = pn[2]; pn[2] = i;
463	greg	2.1	}
464			if (pn[1] == pn[2]) { /* single link */
465			pp = &mp->patch[pn[1]];
466			if (pp->j1tri == NULL) {
467			pp->j1tri = (struct PJoin1 *)malloc(
468			256*sizeof(struct PJoin1));
469			if (pp->j1tri == NULL)
470			goto nomem;
471			}
472	greg	2.2	if (pp->nj1tris < 256) {
473			pp->j1tri[pp->nj1tris].v1j = vid[0];
474			pp->j1tri[pp->nj1tris].v2 = vid[1] & 0xff;
475			pp->j1tri[pp->nj1tris].v3 = vid[2] & 0xff;
476	greg	2.4	pp->j1tri[pp->nj1tris].mat = mo;
477	greg	2.2	return(pn[1] << 10 \| 0x200 \| pp->nj1tris++);
478			}
479	greg	2.1	}
480			/* double link */
481			pp = &mp->patch[pn[2]];
482			if (pp->j2tri == NULL) {
483			pp->j2tri = (struct PJoin2 *)malloc(
484			256*sizeof(struct PJoin2));
485			if (pp->j2tri == NULL)
486			goto nomem;
487			}
488			if (pp->nj2tris >= 256)
489	greg	2.2	error(INTERNAL, "too many patch triangles in addmeshtri");
490			pp->j2tri[pp->nj2tris].v1j = vid[0];
491			pp->j2tri[pp->nj2tris].v2j = vid[1];
492	greg	2.1	pp->j2tri[pp->nj2tris].v3 = vid[2] & 0xff;
493	greg	2.4	pp->j2tri[pp->nj2tris].mat = mo;
494	greg	2.1	return(pn[2] << 10 \| 0x300 \| pp->nj2tris++);
495			nomem:
496			error(SYSTEM, "out of memory in addmeshtri");
497			return(OVOID);
498			}
499
500
501	greg	2.4	char *
502			checkmesh(mp) /* validate mesh data */
503			register MESH *mp;
504			{
505			static char embuf[128];
506			int nouvbounds = 1;
507			register int i;
508			/* basic checks */
509			if (mp == NULL)
510			return("NULL mesh pointer");
511			if (!mp->ldflags)
512			return("unassigned mesh");
513			if (mp->name == NULL)
514			return("missing mesh name");
515			if (mp->nref <= 0)
516			return("unreferenced mesh");
517			/* check boundaries */
518			if (mp->ldflags & IO_BOUNDS) {
519			if (mp->mcube.cusize <= FTINY)
520			return("illegal octree bounds in mesh");
521	greg	2.5	nouvbounds = (mp->uvlim[1][0] - mp->uvlim[0][0] <= FTINY \|\|
522			mp->uvlim[1][1] - mp->uvlim[0][1] <= FTINY);
523	greg	2.4	}
524			/* check octree */
525			if (mp->ldflags & IO_TREE) {
526			if (isempty(mp->mcube.cutree))
527			error(WARNING, "empty mesh octree");
528			}
529			/* check scene data */
530			if (mp->ldflags & IO_SCENE) {
531			if (!(mp->ldflags & IO_BOUNDS))
532			return("unbounded scene in mesh");
533			if (mp->mat0 < 0 \|\| mp->mat0+mp->nmats > nobjects)
534			return("bad mesh modifier range");
535			for (i = mp->mat0+mp->nmats; i-- > mp->mat0; ) {
536			int otyp = objptr(i)->otype;
537			if (!ismodifier(otyp)) {
538			sprintf(embuf,
539			"non-modifier in mesh (%s \"%s\")",
540			ofun[otyp].funame, objptr(i)->oname);
541			return(embuf);
542			}
543			}
544			if (mp->npatches <= 0)
545			error(WARNING, "no patches in mesh");
546			for (i = 0; i < mp->npatches; i++) {
547			register MESHPATCH *pp = &mp->patch[i];
548			if (pp->nverts <= 0)
549			error(WARNING, "no vertices in patch");
550			else {
551			if (pp->xyz == NULL)
552			return("missing patch vertex list");
553			if (nouvbounds && pp->uv != NULL)
554			return("unreferenced uv coordinates");
555			}
556			if (pp->ntris > 0 && pp->tri == NULL)
557			return("missing patch triangle list");
558			if (pp->nj1tris > 0 && pp->j1tri == NULL)
559			return("missing patch joiner triangle list");
560			if (pp->nj2tris > 0 && pp->j2tri == NULL)
561			return("missing patch double-joiner list");
562			}
563			}
564			return(NULL); /* seems OK */
565			}
566
567
568	greg	2.1	static void
569			tallyoctree(ot, ecp, lcp, ocp) /* tally octree size */
570			OCTREE ot;
571			int ecp, lcp, *ocp;
572			{
573			int i;
574
575			if (isempty(ot)) {
576			(*ecp)++;
577			return;
578			}
579			if (isfull(ot)) {
580			OBJECT oset[MAXSET+1];
581			(*lcp)++;
582			objset(oset, ot);
583			*ocp += oset[0];
584			return;
585			}
586			for (i = 0; i < 8; i++)
587			tallyoctree(octkid(ot, i), ecp, lcp, ocp);
588			}
589
590
591			void
592			printmeshstats(ms, fp) /* print out mesh statistics */
593			MESH *ms;
594			FILE *fp;
595			{
596			int lfcnt=0, lecnt=0, locnt=0;
597			int vcnt=0, ncnt=0, uvcnt=0;
598			int nscnt=0, uvscnt=0;
599			int tcnt=0, t1cnt=0, t2cnt=0;
600			int i, j;
601
602			tallyoctree(ms->mcube.cutree, &lecnt, &lfcnt, &locnt);
603			for (i = 0; i < ms->npatches; i++) {
604			register MESHPATCH *pp = &ms->patch[i];
605			vcnt += pp->nverts;
606			if (pp->norm != NULL) {
607			for (j = pp->nverts; j--; )
608			if (pp->norm[j])
609			ncnt++;
610			nscnt += pp->nverts;
611			}
612			if (pp->uv != NULL) {
613			for (j = pp->nverts; j--; )
614			if (pp->uv[j][0])
615			uvcnt++;
616			uvscnt += pp->nverts;
617			}
618			tcnt += pp->ntris;
619			t1cnt += pp->nj1tris;
620			t2cnt += pp->nj2tris;
621			}
622			fprintf(fp, "Mesh statistics:\n");
623	schorsch	2.12	fprintf(fp, "\t%ld materials\n", ms->nmats);
624	greg	2.1	fprintf(fp, "\t%d patches (%.2f MBytes)\n", ms->npatches,
625			(ms->npatches*sizeof(MESHPATCH) +
626	greg	2.8	vcnt3sizeof(uint32) +
627			nscnt*sizeof(int32) +
628	greg	2.16	uvscnt2sizeof(uint32) +
629	greg	2.1	tcnt*sizeof(struct PTri) +
630			t1cnt*sizeof(struct PJoin1) +
631			t2cntsizeof(struct PJoin2))/(1024.1024.));
632			fprintf(fp, "\t%d vertices (%.1f%% w/ normals, %.1f%% w/ uv)\n",
633			vcnt, 100.ncnt/vcnt, 100.uvcnt/vcnt);
634			fprintf(fp, "\t%d triangles (%.1f%% local, %.1f%% joiner)\n",
635			tcnt+t1cnt+t2cnt,
636			100.*tcnt/(tcnt+t1cnt+t2cnt),
637			100.*t1cnt/(tcnt+t1cnt+t2cnt));
638			fprintf(fp,
639			"\t%d leaves in octree (%.1f%% empty, %.2f avg. set size)\n",
640			lfcnt+lecnt, 100.*lecnt/(lfcnt+lecnt),
641			(double)locnt/lfcnt);
642			}
643
644
645			void
646			freemesh(ms) /* free mesh data */
647	greg	2.4	register MESH *ms;
648	greg	2.1	{
649			MESH mhead;
650			MESH *msp;
651
652			if (ms == NULL)
653			return;
654			if (ms->nref <= 0)
655			error(CONSISTENCY, "unreferenced mesh in freemesh");
656			ms->nref--;
657			if (ms->nref) /* still in use */
658			return;
659			/* else remove from list */
660			mhead.next = mlist;
661			for (msp = &mhead; msp->next != NULL; msp = msp->next)
662			if (msp->next == ms) {
663			msp->next = ms->next;
664			ms->next = NULL;
665			break;
666			}
667			if (ms->next != NULL) /* can't be in list anymore */
668			error(CONSISTENCY, "unlisted mesh in freemesh");
669			mlist = mhead.next;
670			/* free mesh data */
671			freestr(ms->name);
672			octfree(ms->mcube.cutree);
673	greg	2.4	lu_done(&ms->lut);
674	greg	2.1	if (ms->npatches > 0) {
675			register MESHPATCH *pp = ms->patch + ms->npatches;
676			while (pp-- > ms->patch) {
677			if (pp->j2tri != NULL)
678			free((void *)pp->j2tri);
679			if (pp->j1tri != NULL)
680			free((void *)pp->j1tri);
681			if (pp->tri != NULL)
682			free((void *)pp->tri);
683			if (pp->uv != NULL)
684			free((void *)pp->uv);
685			if (pp->norm != NULL)
686			free((void *)pp->norm);
687			if (pp->xyz != NULL)
688			free((void *)pp->xyz);
689			}
690			free((void *)ms->patch);
691			}
692	greg	2.4	if (ms->pseudo != NULL)
693			free((void *)ms->pseudo);
694	greg	2.1	free((void *)ms);
695			}
696
697
698			void
699			freemeshinst(o) /* free mesh instance */
700			OBJREC *o;
701			{
702			if (o->os == NULL)
703			return;
704			freemesh(((MESHINST )o->os).msh);
705			free((void *)o->os);
706			o->os = NULL;
707			}