src/common/mesh.c

#ifndef lint
static const char RCSid[] = "$Id: mesh.c,v 2.25 2012/11/06 01:56:37 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 unsigned long
cvhash(const char *p)                   /* hash an encoded vertex */
{
        const MCVERT    *cvp = (const MCVERT *)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(const char *vv1, const char *vv2)         /* compare encoded vertices */
{
        const MCVERT    *v1 = (const MCVERT *)vv1, *v2 = (const MCVERT *)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(                                /* get new mesh data reference */
        char    *mname,
        int     flags
)
{
        char  *pathname;
        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(                            /* create mesh instance */
        OBJREC  *o,
        int     flags
)
{
        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
nextmeshtri(                            /* get next triangle ID */
        OBJECT *tip,
        MESH *mp
)
{
        int             pn;
        MESHPATCH       *pp;

        pn = ++(*tip) >> 10;                    /* next triangle (OVOID init) */
        while (pn < mp->npatches) {
                pp = &mp->patch[pn];
                if (!(*tip & 0x200)) {          /* local triangle? */
                        if ((*tip & 0x1ff) < pp->ntris)
                                return(1);
                        *tip &= ~0x1ff;         /* move on to single-joiners */
                        *tip |= 0x200;
                }
                if (!(*tip & 0x100)) {          /* single joiner? */
                        if ((*tip & 0xff) < pp->nj1tris)
                                return(1);
                        *tip &= ~0xff;          /* move on to double-joiners */
                        *tip |= 0x100;
                }
                if ((*tip & 0xff) < pp->nj2tris)
                        return(1);
                *tip = ++pn << 10;              /* first in next patch */
        }
        return(0);                              /* out of patches */
}

int
getmeshtrivid(                          /* 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(                            /* get triangle vertex from ID */
        MESHVERT        *vp,
        MESH            *mp,
        int32           vid,
        int             what
)
{
        int             pn = vid >> 8;
        MESHPATCH       *pp;
        double          vres;
        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(                  /* 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) {
                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(                     /* 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(                    /* find/add a mesh vertex */
        MESH    *mp,
        MESHVERT        *vp
)
{
        LUENT           *lvp;
        MCVERT          cv;
        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 */
                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(                     /* add a new mesh triangle */
        MESH            *mp,
        MESHVERT        tv[3],
        OBJECT          mo
)
{
        int32                   vid[3], t;
        int                     pn[3], i;
        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(MESH *mp)                     /* validate mesh data */
{
        static char     embuf[128];
        int             nouvbounds = 1;
        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++) {
                        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(                    /* tally octree size */
        OCTREE  ot,
        int     *ecp,
        int     *lcp,
        int     *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(                 /* 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++) {
                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", (long)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(MESH *ms)              /* free mesh data */
{
        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) {
                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(OBJREC *o)         /* free mesh instance */
{
        if (o->os == NULL)
                return;
        freemesh((*(MESHINST *)o->os).msh);
        free((void *)o->os);
        o->os = NULL;
}
Revision:	2.26
Committed:	Tue Nov 6 17:12:35 2012 UTC (13 years ago) by greg
Content type:	text/plain
Branch:	MAIN
CVS Tags:	rad5R0, rad4R2P2, rad4R2P1, rad4R2
Changes since 2.25:	+5 -19 lines
Log Message:	Simplified nextmeshtri() logic considerably
#	User	Rev	Content
1	greg	2.1	#ifndef lint
2	greg	2.26	static const char RCSid[] = "$Id: mesh.c,v 2.25 2012/11/06 01:56:37 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
34			static unsigned long
35	greg	2.23	cvhash(const char p) / hash an encoded vertex */
36	greg	2.1	{
37	greg	2.20	const MCVERT cvp = (const MCVERT )p;
38	greg	2.1	unsigned long hval;
39
40			if (!(cvp->fl & MT_V))
41			return(0);
42			hval = cvp->xyz[0] ^ cvp->xyz[1] << 11 ^ cvp->xyz[2] << 22;
43			if (cvp->fl & MT_N)
44			hval ^= cvp->norm;
45			if (cvp->fl & MT_UV)
46			hval ^= cvp->uv[0] ^ cvp->uv[1] << 16;
47			return(hval);
48			}
49
50
51			static int
52	greg	2.23	cvcmp(const char vv1, const char vv2) /* compare encoded vertices */
53	greg	2.1	{
54	greg	2.23	const MCVERT v1 = (const MCVERT )vv1, v2 = (const MCVERT )vv2;
55	greg	2.1	if (v1->fl != v2->fl)
56			return(1);
57			if (v1->xyz[0] != v2->xyz[0])
58			return(1);
59			if (v1->xyz[1] != v2->xyz[1])
60			return(1);
61			if (v1->xyz[2] != v2->xyz[2])
62			return(1);
63			if (v1->fl & MT_N && v1->norm != v2->norm)
64			return(1);
65			if (v1->fl & MT_UV) {
66			if (v1->uv[0] != v2->uv[0])
67			return(1);
68			if (v1->uv[1] != v2->uv[1])
69			return(1);
70			}
71			return(0);
72			}
73
74
75			MESH *
76	greg	2.24	getmesh( /* get new mesh data reference */
77			char *mname,
78			int flags
79			)
80	greg	2.1	{
81			char *pathname;
82	greg	2.24	MESH *ms;
83	greg	2.1
84			flags &= IO_LEGAL;
85			for (ms = mlist; ms != NULL; ms = ms->next)
86	greg	2.11	if (!strcmp(mname, ms->name)) {
87			ms->nref++; /* increase reference count */
88	greg	2.10	break;
89	greg	2.11	}
90	greg	2.10	if (ms == NULL) { /* load first time */
91	greg	2.1	ms = (MESH *)calloc(1, sizeof(MESH));
92			if (ms == NULL)
93			error(SYSTEM, "out of memory in getmesh");
94			ms->name = savestr(mname);
95	greg	2.11	ms->nref = 1;
96	greg	2.1	ms->mcube.cutree = EMPTY;
97			ms->next = mlist;
98			mlist = ms;
99			}
100	greg	2.7	if ((pathname = getpath(mname, getrlibpath(), R_OK)) == NULL) {
101	greg	2.1	sprintf(errmsg, "cannot find mesh file \"%s\"", mname);
102			error(USER, errmsg);
103			}
104			flags &= ~ms->ldflags;
105			if (flags)
106			readmesh(ms, pathname, flags);
107			return(ms);
108			}
109
110
111			MESHINST *
112	greg	2.24	getmeshinst( /* create mesh instance */
113			OBJREC *o,
114			int flags
115			)
116	greg	2.1	{
117	greg	2.24	MESHINST *ins;
118	greg	2.1
119			flags &= IO_LEGAL;
120			if ((ins = (MESHINST *)o->os) == NULL) {
121			if ((ins = (MESHINST *)malloc(sizeof(MESHINST))) == NULL)
122			error(SYSTEM, "out of memory in getmeshinst");
123			if (o->oargs.nsargs < 1)
124			objerror(o, USER, "bad # of arguments");
125			if (fullxf(&ins->x, o->oargs.nsargs-1,
126			o->oargs.sarg+1) != o->oargs.nsargs-1)
127			objerror(o, USER, "bad transform");
128			if (ins->x.f.sca < 0.0) {
129			ins->x.f.sca = -ins->x.f.sca;
130			ins->x.b.sca = -ins->x.b.sca;
131			}
132			ins->msh = NULL;
133			o->os = (char *)ins;
134			}
135	greg	2.10	if (ins->msh == NULL)
136	greg	2.1	ins->msh = getmesh(o->oargs.sarg[0], flags);
137	greg	2.10	else if ((flags &= ~ins->msh->ldflags))
138			readmesh(ins->msh,
139			getpath(o->oargs.sarg[0], getrlibpath(), R_OK),
140			flags);
141	greg	2.1	return(ins);
142			}
143
144
145			int
146	greg	2.24	nextmeshtri( /* get next triangle ID */
147			OBJECT *tip,
148			MESH *mp
149			)
150			{
151			int pn;
152			MESHPATCH *pp;
153
154	greg	2.26	pn = ++(tip) >> 10; / next triangle (OVOID init) */
155	greg	2.25	while (pn < mp->npatches) {
156			pp = &mp->patch[pn];
157			if (!(tip & 0x200)) { / local triangle? */
158	greg	2.26	if ((*tip & 0x1ff) < pp->ntris)
159	greg	2.25	return(1);
160			tip &= ~0x1ff; / move on to single-joiners */
161			*tip \|= 0x200;
162			}
163			if (!(tip & 0x100)) { / single joiner? */
164	greg	2.26	if ((*tip & 0xff) < pp->nj1tris)
165	greg	2.25	return(1);
166			tip &= ~0xff; / move on to double-joiners */
167			*tip \|= 0x100;
168	greg	2.24	}
169	greg	2.26	if ((*tip & 0xff) < pp->nj2tris)
170	greg	2.24	return(1);
171	greg	2.25	tip = ++pn << 10; / first in next patch */
172	greg	2.24	}
173	greg	2.25	return(0); /* out of patches */
174	greg	2.24	}
175
176			int
177			getmeshtrivid( /* get triangle vertex ID's */
178			int32 tvid[3],
179			OBJECT *mo,
180			MESH *mp,
181			OBJECT ti
182			)
183	greg	2.1	{
184			int pn = ti >> 10;
185	greg	2.4	MESHPATCH *pp;
186	greg	2.1
187			if (pn >= mp->npatches)
188			return(0);
189	greg	2.4	pp = &mp->patch[pn];
190	greg	2.1	ti &= 0x3ff;
191			if (!(ti & 0x200)) { /* local triangle */
192			struct PTri *tp;
193	greg	2.4	if (ti >= pp->ntris)
194	greg	2.1	return(0);
195	greg	2.4	tp = &pp->tri[ti];
196	greg	2.1	tvid[0] = tvid[1] = tvid[2] = pn << 8;
197			tvid[0] \|= tp->v1;
198			tvid[1] \|= tp->v2;
199			tvid[2] \|= tp->v3;
200	greg	2.4	if (pp->trimat != NULL)
201			*mo = pp->trimat[ti];
202			else
203			*mo = pp->solemat;
204			if (*mo != OVOID)
205			*mo += mp->mat0;
206	greg	2.1	return(1);
207			}
208			ti &= ~0x200;
209			if (!(ti & 0x100)) { /* single link vertex */
210			struct PJoin1 *tp1;
211	greg	2.4	if (ti >= pp->nj1tris)
212	greg	2.1	return(0);
213	greg	2.4	tp1 = &pp->j1tri[ti];
214	greg	2.1	tvid[0] = tp1->v1j;
215			tvid[1] = tvid[2] = pn << 8;
216			tvid[1] \|= tp1->v2;
217			tvid[2] \|= tp1->v3;
218	greg	2.4	if ((*mo = tp1->mat) != OVOID)
219			*mo += mp->mat0;
220	greg	2.1	return(1);
221			}
222			ti &= ~0x100;
223			{ /* double link vertex */
224			struct PJoin2 *tp2;
225	greg	2.4	if (ti >= pp->nj2tris)
226	greg	2.1	return(0);
227	greg	2.4	tp2 = &pp->j2tri[ti];
228	greg	2.1	tvid[0] = tp2->v1j;
229			tvid[1] = tp2->v2j;
230			tvid[2] = pn << 8 \| tp2->v3;
231	greg	2.4	if ((*mo = tp2->mat) != OVOID)
232			*mo += mp->mat0;
233	greg	2.1	}
234			return(1);
235			}
236
237
238			int
239	greg	2.24	getmeshvert( /* get triangle vertex from ID */
240			MESHVERT *vp,
241			MESH *mp,
242			int32 vid,
243			int what
244			)
245	greg	2.1	{
246			int pn = vid >> 8;
247			MESHPATCH *pp;
248			double vres;
249	greg	2.24	int i;
250	greg	2.1
251			vp->fl = 0;
252			if (pn >= mp->npatches)
253			return(0);
254			pp = &mp->patch[pn];
255			vid &= 0xff;
256			if (vid >= pp->nverts)
257			return(0);
258			/* get location */
259			if (what & MT_V) {
260			vres = (1./4294967296.)*mp->mcube.cusize;
261			for (i = 0; i < 3; i++)
262			vp->v[i] = mp->mcube.cuorg[i] +
263			(pp->xyz[vid][i] + .5)*vres;
264			vp->fl \|= MT_V;
265			}
266			/* get normal */
267			if (what & MT_N && pp->norm != NULL && pp->norm[vid]) {
268			decodedir(vp->n, pp->norm[vid]);
269			vp->fl \|= MT_N;
270			}
271			/* get (u,v) */
272			if (what & MT_UV && pp->uv != NULL && pp->uv[vid][0]) {
273			for (i = 0; i < 2; i++)
274	greg	2.2	vp->uv[i] = mp->uvlim[0][i] +
275			(mp->uvlim[1][i] - mp->uvlim[0][i])*
276	greg	2.16	(pp->uv[vid][i] + .5)*(1./4294967296.);
277	greg	2.1	vp->fl \|= MT_UV;
278			}
279			return(vp->fl);
280			}
281
282
283	greg	2.4	OBJREC *
284	greg	2.24	getmeshpseudo( /* get mesh pseudo object for material */
285			MESH *mp,
286			OBJECT mo
287			)
288	greg	2.4	{
289			if (mo < mp->mat0 \|\| mo >= mp->mat0 + mp->nmats)
290			error(INTERNAL, "modifier out of range in getmeshpseudo");
291			if (mp->pseudo == NULL) {
292	greg	2.24	int i;
293	greg	2.4	mp->pseudo = (OBJREC *)calloc(mp->nmats, sizeof(OBJREC));
294			if (mp->pseudo == NULL)
295			error(SYSTEM, "out of memory in getmeshpseudo");
296			for (i = mp->nmats; i--; ) {
297			mp->pseudo[i].omod = mp->mat0 + i;
298			mp->pseudo[i].otype = OBJ_FACE;
299			mp->pseudo[i].oname = "M-Tri";
300			}
301			}
302			return(&mp->pseudo[mo - mp->mat0]);
303			}
304
305
306	greg	2.1	int
307	greg	2.24	getmeshtri( /* get triangle vertices */
308			MESHVERT tv[3],
309			OBJECT *mo,
310			MESH *mp,
311			OBJECT ti,
312			int wha
313			)
314	greg	2.1	{
315	greg	2.8	int32 tvid[3];
316	greg	2.1
317	greg	2.4	if (!getmeshtrivid(tvid, mo, mp, ti))
318	greg	2.1	return(0);
319
320	greg	2.4	getmeshvert(&tv[0], mp, tvid[0], wha);
321			getmeshvert(&tv[1], mp, tvid[1], wha);
322			getmeshvert(&tv[2], mp, tvid[2], wha);
323	greg	2.1
324			return(tv[0].fl & tv[1].fl & tv[2].fl);
325			}
326
327
328	greg	2.8	int32
329	greg	2.24	addmeshvert( /* find/add a mesh vertex */
330			MESH *mp,
331			MESHVERT *vp
332			)
333	greg	2.1	{
334			LUENT *lvp;
335			MCVERT cv;
336	greg	2.24	int i;
337	greg	2.1
338			if (!(vp->fl & MT_V))
339			return(-1);
340			/* encode vertex */
341			for (i = 0; i < 3; i++) {
342			if (vp->v[i] < mp->mcube.cuorg[i])
343			return(-1);
344			if (vp->v[i] >= mp->mcube.cuorg[i] + mp->mcube.cusize)
345			return(-1);
346	greg	2.8	cv.xyz[i] = (uint32)(4294967296. *
347	greg	2.1	(vp->v[i] - mp->mcube.cuorg[i]) /
348			mp->mcube.cusize);
349			}
350	greg	2.16	if (vp->fl & MT_N) /* assumes normalized! */
351	greg	2.1	cv.norm = encodedir(vp->n);
352			if (vp->fl & MT_UV)
353			for (i = 0; i < 2; i++) {
354	greg	2.2	if (vp->uv[i] <= mp->uvlim[0][i])
355	greg	2.1	return(-1);
356	greg	2.2	if (vp->uv[i] >= mp->uvlim[1][i])
357	greg	2.1	return(-1);
358	greg	2.16	cv.uv[i] = (uint32)(4294967296. *
359	greg	2.2	(vp->uv[i] - mp->uvlim[0][i]) /
360			(mp->uvlim[1][i] - mp->uvlim[0][i]));
361	greg	2.1	}
362			cv.fl = vp->fl;
363	greg	2.4	if (mp->lut.tsiz == 0) {
364			mp->lut.hashf = cvhash;
365			mp->lut.keycmp = cvcmp;
366			mp->lut.freek = free;
367			if (!lu_init(&mp->lut, 50000))
368	greg	2.1	goto nomem;
369			}
370			/* find entry */
371	greg	2.4	lvp = lu_find(&mp->lut, (char *)&cv);
372	greg	2.1	if (lvp == NULL)
373			goto nomem;
374			if (lvp->key == NULL) {
375	greg	2.8	lvp->key = (char *)malloc(sizeof(MCVERT)+sizeof(int32));
376	schorsch	2.9	memcpy((void )lvp->key, (void )&cv, sizeof(MCVERT));
377	greg	2.1	}
378			if (lvp->data == NULL) { /* new vertex */
379	greg	2.24	MESHPATCH *pp;
380	greg	2.1	if (mp->npatches <= 0) {
381			mp->patch = (MESHPATCH *)calloc(MPATCHBLKSIZ,
382			sizeof(MESHPATCH));
383			if (mp->patch == NULL)
384			goto nomem;
385			mp->npatches = 1;
386			} else if (mp->patch[mp->npatches-1].nverts >= 256) {
387			if (mp->npatches % MPATCHBLKSIZ == 0) {
388			mp->patch = (MESHPATCH *)realloc(
389			(void *)mp->patch,
390			(mp->npatches + MPATCHBLKSIZ)*
391			sizeof(MESHPATCH));
392	schorsch	2.9	memset((void *)(mp->patch + mp->npatches), '\0',
393	greg	2.1	MPATCHBLKSIZ*sizeof(MESHPATCH));
394			}
395	greg	2.2	if (mp->npatches++ >= 1L<<22)
396	greg	2.1	error(INTERNAL, "too many mesh patches");
397			}
398			pp = &mp->patch[mp->npatches-1];
399			if (pp->xyz == NULL) {
400	greg	2.8	pp->xyz = (uint32 ()[3])calloc(256, 3sizeof(int32));
401	greg	2.1	if (pp->xyz == NULL)
402			goto nomem;
403			}
404			for (i = 0; i < 3; i++)
405			pp->xyz[pp->nverts][i] = cv.xyz[i];
406			if (cv.fl & MT_N) {
407			if (pp->norm == NULL) {
408	greg	2.8	pp->norm = (int32 *)calloc(256, sizeof(int32));
409	greg	2.1	if (pp->norm == NULL)
410			goto nomem;
411			}
412			pp->norm[pp->nverts] = cv.norm;
413			}
414			if (cv.fl & MT_UV) {
415			if (pp->uv == NULL) {
416	greg	2.16	pp->uv = (uint32 (*)[2])calloc(256,
417			2*sizeof(uint32));
418	greg	2.1	if (pp->uv == NULL)
419			goto nomem;
420			}
421			for (i = 0; i < 2; i++)
422			pp->uv[pp->nverts][i] = cv.uv[i];
423			}
424			pp->nverts++;
425			lvp->data = lvp->key + sizeof(MCVERT);
426	greg	2.8	(int32 )lvp->data = (mp->npatches-1) << 8 \| (pp->nverts-1);
427	greg	2.1	}
428	greg	2.8	return((int32 )lvp->data);
429	greg	2.1	nomem:
430			error(SYSTEM, "out of memory in addmeshvert");
431			return(-1);
432			}
433
434
435			OBJECT
436	greg	2.24	addmeshtri( /* add a new mesh triangle */
437			MESH *mp,
438			MESHVERT tv[3],
439			OBJECT mo
440			)
441	greg	2.1	{
442	greg	2.8	int32 vid[3], t;
443	greg	2.1	int pn[3], i;
444	greg	2.24	MESHPATCH *pp;
445	greg	2.1
446			if (!(tv[0].fl & tv[1].fl & tv[2].fl & MT_V))
447			return(OVOID);
448			/* find/allocate patch vertices */
449			for (i = 0; i < 3; i++) {
450			if ((vid[i] = addmeshvert(mp, &tv[i])) < 0)
451			return(OVOID);
452			pn[i] = vid[i] >> 8;
453			}
454	greg	2.4	/* normalize material index */
455	schorsch	2.13	if (mo != OVOID) {
456	greg	2.4	if ((mo -= mp->mat0) >= mp->nmats)
457			mp->nmats = mo+1;
458			else if (mo < 0)
459			error(INTERNAL, "modifier range error in addmeshtri");
460	schorsch	2.13	}
461	greg	2.1	/* assign triangle */
462			if (pn[0] == pn[1] && pn[1] == pn[2]) { /* local case */
463			pp = &mp->patch[pn[0]];
464			if (pp->tri == NULL) {
465			pp->tri = (struct PTri *)malloc(
466			512*sizeof(struct PTri));
467			if (pp->tri == NULL)
468			goto nomem;
469			}
470	greg	2.2	if (pp->ntris < 512) {
471			pp->tri[pp->ntris].v1 = vid[0] & 0xff;
472			pp->tri[pp->ntris].v2 = vid[1] & 0xff;
473			pp->tri[pp->ntris].v3 = vid[2] & 0xff;
474	greg	2.4	if (pp->ntris == 0)
475			pp->solemat = mo;
476			else if (pp->trimat == NULL && mo != pp->solemat) {
477	greg	2.8	pp->trimat = (int16 *)malloc(
478			512*sizeof(int16));
479	greg	2.4	if (pp->trimat == NULL)
480			goto nomem;
481			for (i = pp->ntris; i--; )
482			pp->trimat[i] = pp->solemat;
483			}
484			if (pp->trimat != NULL)
485			pp->trimat[pp->ntris] = mo;
486	greg	2.2	return(pn[0] << 10 \| pp->ntris++);
487			}
488	greg	2.1	}
489			if (pn[0] == pn[1]) {
490	greg	2.2	t = vid[2]; vid[2] = vid[1]; vid[1] = vid[0]; vid[0] = t;
491			i = pn[2]; pn[2] = pn[1]; pn[1] = pn[0]; pn[0] = i;
492	greg	2.1	} else if (pn[0] == pn[2]) {
493	greg	2.2	t = vid[0]; vid[0] = vid[1]; vid[1] = vid[2]; vid[2] = t;
494			i = pn[0]; pn[0] = pn[1]; pn[1] = pn[2]; pn[2] = i;
495	greg	2.1	}
496			if (pn[1] == pn[2]) { /* single link */
497			pp = &mp->patch[pn[1]];
498			if (pp->j1tri == NULL) {
499			pp->j1tri = (struct PJoin1 *)malloc(
500			256*sizeof(struct PJoin1));
501			if (pp->j1tri == NULL)
502			goto nomem;
503			}
504	greg	2.2	if (pp->nj1tris < 256) {
505			pp->j1tri[pp->nj1tris].v1j = vid[0];
506			pp->j1tri[pp->nj1tris].v2 = vid[1] & 0xff;
507			pp->j1tri[pp->nj1tris].v3 = vid[2] & 0xff;
508	greg	2.4	pp->j1tri[pp->nj1tris].mat = mo;
509	greg	2.2	return(pn[1] << 10 \| 0x200 \| pp->nj1tris++);
510			}
511	greg	2.1	}
512			/* double link */
513			pp = &mp->patch[pn[2]];
514			if (pp->j2tri == NULL) {
515			pp->j2tri = (struct PJoin2 *)malloc(
516			256*sizeof(struct PJoin2));
517			if (pp->j2tri == NULL)
518			goto nomem;
519			}
520			if (pp->nj2tris >= 256)
521	greg	2.2	error(INTERNAL, "too many patch triangles in addmeshtri");
522			pp->j2tri[pp->nj2tris].v1j = vid[0];
523			pp->j2tri[pp->nj2tris].v2j = vid[1];
524	greg	2.1	pp->j2tri[pp->nj2tris].v3 = vid[2] & 0xff;
525	greg	2.4	pp->j2tri[pp->nj2tris].mat = mo;
526	greg	2.1	return(pn[2] << 10 \| 0x300 \| pp->nj2tris++);
527			nomem:
528			error(SYSTEM, "out of memory in addmeshtri");
529			return(OVOID);
530			}
531
532
533	greg	2.4	char *
534	greg	2.24	checkmesh(MESH mp) / validate mesh data */
535	greg	2.4	{
536			static char embuf[128];
537			int nouvbounds = 1;
538	greg	2.24	int i;
539	greg	2.4	/* basic checks */
540			if (mp == NULL)
541			return("NULL mesh pointer");
542			if (!mp->ldflags)
543			return("unassigned mesh");
544			if (mp->name == NULL)
545			return("missing mesh name");
546			if (mp->nref <= 0)
547			return("unreferenced mesh");
548			/* check boundaries */
549			if (mp->ldflags & IO_BOUNDS) {
550			if (mp->mcube.cusize <= FTINY)
551			return("illegal octree bounds in mesh");
552	greg	2.5	nouvbounds = (mp->uvlim[1][0] - mp->uvlim[0][0] <= FTINY \|\|
553			mp->uvlim[1][1] - mp->uvlim[0][1] <= FTINY);
554	greg	2.4	}
555			/* check octree */
556			if (mp->ldflags & IO_TREE) {
557			if (isempty(mp->mcube.cutree))
558			error(WARNING, "empty mesh octree");
559			}
560			/* check scene data */
561			if (mp->ldflags & IO_SCENE) {
562			if (!(mp->ldflags & IO_BOUNDS))
563			return("unbounded scene in mesh");
564			if (mp->mat0 < 0 \|\| mp->mat0+mp->nmats > nobjects)
565			return("bad mesh modifier range");
566			for (i = mp->mat0+mp->nmats; i-- > mp->mat0; ) {
567			int otyp = objptr(i)->otype;
568			if (!ismodifier(otyp)) {
569			sprintf(embuf,
570			"non-modifier in mesh (%s \"%s\")",
571			ofun[otyp].funame, objptr(i)->oname);
572			return(embuf);
573			}
574			}
575			if (mp->npatches <= 0)
576			error(WARNING, "no patches in mesh");
577			for (i = 0; i < mp->npatches; i++) {
578	greg	2.24	MESHPATCH *pp = &mp->patch[i];
579	greg	2.4	if (pp->nverts <= 0)
580			error(WARNING, "no vertices in patch");
581			else {
582			if (pp->xyz == NULL)
583			return("missing patch vertex list");
584			if (nouvbounds && pp->uv != NULL)
585			return("unreferenced uv coordinates");
586			}
587			if (pp->ntris > 0 && pp->tri == NULL)
588			return("missing patch triangle list");
589			if (pp->nj1tris > 0 && pp->j1tri == NULL)
590			return("missing patch joiner triangle list");
591			if (pp->nj2tris > 0 && pp->j2tri == NULL)
592			return("missing patch double-joiner list");
593			}
594			}
595			return(NULL); /* seems OK */
596			}
597
598
599	greg	2.1	static void
600	greg	2.24	tallyoctree( /* tally octree size */
601			OCTREE ot,
602			int *ecp,
603			int *lcp,
604			int *ocp
605			)
606	greg	2.1	{
607			int i;
608
609			if (isempty(ot)) {
610			(*ecp)++;
611			return;
612			}
613			if (isfull(ot)) {
614			OBJECT oset[MAXSET+1];
615			(*lcp)++;
616			objset(oset, ot);
617			*ocp += oset[0];
618			return;
619			}
620			for (i = 0; i < 8; i++)
621			tallyoctree(octkid(ot, i), ecp, lcp, ocp);
622			}
623
624
625			void
626	greg	2.24	printmeshstats( /* print out mesh statistics */
627			MESH *ms,
628			FILE *fp
629			)
630	greg	2.1	{
631			int lfcnt=0, lecnt=0, locnt=0;
632			int vcnt=0, ncnt=0, uvcnt=0;
633			int nscnt=0, uvscnt=0;
634			int tcnt=0, t1cnt=0, t2cnt=0;
635			int i, j;
636
637			tallyoctree(ms->mcube.cutree, &lecnt, &lfcnt, &locnt);
638			for (i = 0; i < ms->npatches; i++) {
639	greg	2.24	MESHPATCH *pp = &ms->patch[i];
640	greg	2.1	vcnt += pp->nverts;
641			if (pp->norm != NULL) {
642			for (j = pp->nverts; j--; )
643			if (pp->norm[j])
644			ncnt++;
645			nscnt += pp->nverts;
646			}
647			if (pp->uv != NULL) {
648			for (j = pp->nverts; j--; )
649			if (pp->uv[j][0])
650			uvcnt++;
651			uvscnt += pp->nverts;
652			}
653			tcnt += pp->ntris;
654			t1cnt += pp->nj1tris;
655			t2cnt += pp->nj2tris;
656			}
657			fprintf(fp, "Mesh statistics:\n");
658	greg	2.22	fprintf(fp, "\t%ld materials\n", (long)ms->nmats);
659	greg	2.1	fprintf(fp, "\t%d patches (%.2f MBytes)\n", ms->npatches,
660			(ms->npatches*sizeof(MESHPATCH) +
661	greg	2.8	vcnt3sizeof(uint32) +
662			nscnt*sizeof(int32) +
663	greg	2.16	uvscnt2sizeof(uint32) +
664	greg	2.1	tcnt*sizeof(struct PTri) +
665			t1cnt*sizeof(struct PJoin1) +
666			t2cntsizeof(struct PJoin2))/(1024.1024.));
667			fprintf(fp, "\t%d vertices (%.1f%% w/ normals, %.1f%% w/ uv)\n",
668			vcnt, 100.ncnt/vcnt, 100.uvcnt/vcnt);
669			fprintf(fp, "\t%d triangles (%.1f%% local, %.1f%% joiner)\n",
670			tcnt+t1cnt+t2cnt,
671			100.*tcnt/(tcnt+t1cnt+t2cnt),
672			100.*t1cnt/(tcnt+t1cnt+t2cnt));
673			fprintf(fp,
674			"\t%d leaves in octree (%.1f%% empty, %.2f avg. set size)\n",
675			lfcnt+lecnt, 100.*lecnt/(lfcnt+lecnt),
676			(double)locnt/lfcnt);
677			}
678
679
680			void
681	greg	2.24	freemesh(MESH ms) / free mesh data */
682	greg	2.1	{
683			MESH mhead;
684			MESH *msp;
685
686			if (ms == NULL)
687			return;
688			if (ms->nref <= 0)
689			error(CONSISTENCY, "unreferenced mesh in freemesh");
690			ms->nref--;
691			if (ms->nref) /* still in use */
692			return;
693			/* else remove from list */
694			mhead.next = mlist;
695			for (msp = &mhead; msp->next != NULL; msp = msp->next)
696			if (msp->next == ms) {
697			msp->next = ms->next;
698			ms->next = NULL;
699			break;
700			}
701			if (ms->next != NULL) /* can't be in list anymore */
702			error(CONSISTENCY, "unlisted mesh in freemesh");
703			mlist = mhead.next;
704			/* free mesh data */
705			freestr(ms->name);
706			octfree(ms->mcube.cutree);
707	greg	2.4	lu_done(&ms->lut);
708	greg	2.1	if (ms->npatches > 0) {
709	greg	2.24	MESHPATCH *pp = ms->patch + ms->npatches;
710	greg	2.1	while (pp-- > ms->patch) {
711			if (pp->j2tri != NULL)
712			free((void *)pp->j2tri);
713			if (pp->j1tri != NULL)
714			free((void *)pp->j1tri);
715			if (pp->tri != NULL)
716			free((void *)pp->tri);
717			if (pp->uv != NULL)
718			free((void *)pp->uv);
719			if (pp->norm != NULL)
720			free((void *)pp->norm);
721			if (pp->xyz != NULL)
722			free((void *)pp->xyz);
723			}
724			free((void *)ms->patch);
725			}
726	greg	2.4	if (ms->pseudo != NULL)
727			free((void *)ms->pseudo);
728	greg	2.1	free((void *)ms);
729			}
730
731
732			void
733	greg	2.24	freemeshinst(OBJREC o) / free mesh instance */
734	greg	2.1	{
735			if (o->os == NULL)
736			return;
737			freemesh(((MESHINST )o->os).msh);
738			free((void *)o->os);
739			o->os = NULL;
740			}