src/common/mesh.c

#ifndef lint
static const char RCSid[] = "$Id: mesh.c,v 2.24 2012/11/06 01:04:23 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             advance = 1;
        int             pn;
        MESHPATCH       *pp;

        if (*tip == OVOID) {                    /* check for first index */
                *tip = 0;
                advance = 0;
        }
        pn = *tip >> 10;
        while (pn < mp->npatches) {
                pp = &mp->patch[pn];
                if (!(*tip & 0x200)) {          /* local triangle? */
                        if ((*tip & 0x1ff) < pp->ntris - advance) {
                                *tip += advance;
                                return(1);
                        }
                        *tip &= ~0x1ff;         /* move on to single-joiners */
                        *tip |= 0x200;
                        advance = 0;
                }
                if (!(*tip & 0x100)) {          /* single joiner? */
                        if ((*tip & 0xff) < pp->nj1tris - advance) {
                                *tip += advance;
                                return(1);
                        }
                        *tip &= ~0xff;          /* move on to double-joiners */
                        *tip |= 0x100;
                        advance = 0;
                }
                if ((*tip & 0xff) < pp->nj2tris - advance) {
                        *tip += advance;
                        return(1);
                }
                *tip = ++pn << 10;              /* first in next patch */
                advance = 0;
        }
        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:	2.25
Committed:	Tue Nov 6 01:56:37 2012 UTC (11 years, 5 months ago) by greg
Content type:	text/plain
Branch:	MAIN
Changes since 2.24:	+27 -27 lines
Log Message:	Fixed potential bugs in new routine -- still untested
#	User	Rev	Content
1	greg	2.1	#ifndef lint
2	greg	2.25	static const char RCSid[] = "$Id: mesh.c,v 2.24 2012/11/06 01:04:23 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	greg	2.25	int advance = 1;
152	greg	2.24	int pn;
153			MESHPATCH *pp;
154
155			if (tip == OVOID) { / check for first index */
156			*tip = 0;
157	greg	2.25	advance = 0;
158	greg	2.24	}
159			pn = *tip >> 10;
160	greg	2.25	while (pn < mp->npatches) {
161			pp = &mp->patch[pn];
162			if (!(tip & 0x200)) { / local triangle? */
163			if ((*tip & 0x1ff) < pp->ntris - advance) {
164			*tip += advance;
165			return(1);
166			}
167			tip &= ~0x1ff; / move on to single-joiners */
168			*tip \|= 0x200;
169			advance = 0;
170			}
171			if (!(tip & 0x100)) { / single joiner? */
172			if ((*tip & 0xff) < pp->nj1tris - advance) {
173			*tip += advance;
174			return(1);
175			}
176			tip &= ~0xff; / move on to double-joiners */
177			*tip \|= 0x100;
178			advance = 0;
179	greg	2.24	}
180	greg	2.25	if ((*tip & 0xff) < pp->nj2tris - advance) {
181			*tip += advance;
182	greg	2.24	return(1);
183			}
184	greg	2.25	tip = ++pn << 10; / first in next patch */
185			advance = 0;
186	greg	2.24	}
187	greg	2.25	return(0); /* out of patches */
188	greg	2.24	}
189
190			int
191			getmeshtrivid( /* get triangle vertex ID's */
192			int32 tvid[3],
193			OBJECT *mo,
194			MESH *mp,
195			OBJECT ti
196			)
197	greg	2.1	{
198			int pn = ti >> 10;
199	greg	2.4	MESHPATCH *pp;
200	greg	2.1
201			if (pn >= mp->npatches)
202			return(0);
203	greg	2.4	pp = &mp->patch[pn];
204	greg	2.1	ti &= 0x3ff;
205			if (!(ti & 0x200)) { /* local triangle */
206			struct PTri *tp;
207	greg	2.4	if (ti >= pp->ntris)
208	greg	2.1	return(0);
209	greg	2.4	tp = &pp->tri[ti];
210	greg	2.1	tvid[0] = tvid[1] = tvid[2] = pn << 8;
211			tvid[0] \|= tp->v1;
212			tvid[1] \|= tp->v2;
213			tvid[2] \|= tp->v3;
214	greg	2.4	if (pp->trimat != NULL)
215			*mo = pp->trimat[ti];
216			else
217			*mo = pp->solemat;
218			if (*mo != OVOID)
219			*mo += mp->mat0;
220	greg	2.1	return(1);
221			}
222			ti &= ~0x200;
223			if (!(ti & 0x100)) { /* single link vertex */
224			struct PJoin1 *tp1;
225	greg	2.4	if (ti >= pp->nj1tris)
226	greg	2.1	return(0);
227	greg	2.4	tp1 = &pp->j1tri[ti];
228	greg	2.1	tvid[0] = tp1->v1j;
229			tvid[1] = tvid[2] = pn << 8;
230			tvid[1] \|= tp1->v2;
231			tvid[2] \|= tp1->v3;
232	greg	2.4	if ((*mo = tp1->mat) != OVOID)
233			*mo += mp->mat0;
234	greg	2.1	return(1);
235			}
236			ti &= ~0x100;
237			{ /* double link vertex */
238			struct PJoin2 *tp2;
239	greg	2.4	if (ti >= pp->nj2tris)
240	greg	2.1	return(0);
241	greg	2.4	tp2 = &pp->j2tri[ti];
242	greg	2.1	tvid[0] = tp2->v1j;
243			tvid[1] = tp2->v2j;
244			tvid[2] = pn << 8 \| tp2->v3;
245	greg	2.4	if ((*mo = tp2->mat) != OVOID)
246			*mo += mp->mat0;
247	greg	2.1	}
248			return(1);
249			}
250
251
252			int
253	greg	2.24	getmeshvert( /* get triangle vertex from ID */
254			MESHVERT *vp,
255			MESH *mp,
256			int32 vid,
257			int what
258			)
259	greg	2.1	{
260			int pn = vid >> 8;
261			MESHPATCH *pp;
262			double vres;
263	greg	2.24	int i;
264	greg	2.1
265			vp->fl = 0;
266			if (pn >= mp->npatches)
267			return(0);
268			pp = &mp->patch[pn];
269			vid &= 0xff;
270			if (vid >= pp->nverts)
271			return(0);
272			/* get location */
273			if (what & MT_V) {
274			vres = (1./4294967296.)*mp->mcube.cusize;
275			for (i = 0; i < 3; i++)
276			vp->v[i] = mp->mcube.cuorg[i] +
277			(pp->xyz[vid][i] + .5)*vres;
278			vp->fl \|= MT_V;
279			}
280			/* get normal */
281			if (what & MT_N && pp->norm != NULL && pp->norm[vid]) {
282			decodedir(vp->n, pp->norm[vid]);
283			vp->fl \|= MT_N;
284			}
285			/* get (u,v) */
286			if (what & MT_UV && pp->uv != NULL && pp->uv[vid][0]) {
287			for (i = 0; i < 2; i++)
288	greg	2.2	vp->uv[i] = mp->uvlim[0][i] +
289			(mp->uvlim[1][i] - mp->uvlim[0][i])*
290	greg	2.16	(pp->uv[vid][i] + .5)*(1./4294967296.);
291	greg	2.1	vp->fl \|= MT_UV;
292			}
293			return(vp->fl);
294			}
295
296
297	greg	2.4	OBJREC *
298	greg	2.24	getmeshpseudo( /* get mesh pseudo object for material */
299			MESH *mp,
300			OBJECT mo
301			)
302	greg	2.4	{
303			if (mo < mp->mat0 \|\| mo >= mp->mat0 + mp->nmats)
304			error(INTERNAL, "modifier out of range in getmeshpseudo");
305			if (mp->pseudo == NULL) {
306	greg	2.24	int i;
307	greg	2.4	mp->pseudo = (OBJREC *)calloc(mp->nmats, sizeof(OBJREC));
308			if (mp->pseudo == NULL)
309			error(SYSTEM, "out of memory in getmeshpseudo");
310			for (i = mp->nmats; i--; ) {
311			mp->pseudo[i].omod = mp->mat0 + i;
312			mp->pseudo[i].otype = OBJ_FACE;
313			mp->pseudo[i].oname = "M-Tri";
314			}
315			}
316			return(&mp->pseudo[mo - mp->mat0]);
317			}
318
319
320	greg	2.1	int
321	greg	2.24	getmeshtri( /* get triangle vertices */
322			MESHVERT tv[3],
323			OBJECT *mo,
324			MESH *mp,
325			OBJECT ti,
326			int wha
327			)
328	greg	2.1	{
329	greg	2.8	int32 tvid[3];
330	greg	2.1
331	greg	2.4	if (!getmeshtrivid(tvid, mo, mp, ti))
332	greg	2.1	return(0);
333
334	greg	2.4	getmeshvert(&tv[0], mp, tvid[0], wha);
335			getmeshvert(&tv[1], mp, tvid[1], wha);
336			getmeshvert(&tv[2], mp, tvid[2], wha);
337	greg	2.1
338			return(tv[0].fl & tv[1].fl & tv[2].fl);
339			}
340
341
342	greg	2.8	int32
343	greg	2.24	addmeshvert( /* find/add a mesh vertex */
344			MESH *mp,
345			MESHVERT *vp
346			)
347	greg	2.1	{
348			LUENT *lvp;
349			MCVERT cv;
350	greg	2.24	int i;
351	greg	2.1
352			if (!(vp->fl & MT_V))
353			return(-1);
354			/* encode vertex */
355			for (i = 0; i < 3; i++) {
356			if (vp->v[i] < mp->mcube.cuorg[i])
357			return(-1);
358			if (vp->v[i] >= mp->mcube.cuorg[i] + mp->mcube.cusize)
359			return(-1);
360	greg	2.8	cv.xyz[i] = (uint32)(4294967296. *
361	greg	2.1	(vp->v[i] - mp->mcube.cuorg[i]) /
362			mp->mcube.cusize);
363			}
364	greg	2.16	if (vp->fl & MT_N) /* assumes normalized! */
365	greg	2.1	cv.norm = encodedir(vp->n);
366			if (vp->fl & MT_UV)
367			for (i = 0; i < 2; i++) {
368	greg	2.2	if (vp->uv[i] <= mp->uvlim[0][i])
369	greg	2.1	return(-1);
370	greg	2.2	if (vp->uv[i] >= mp->uvlim[1][i])
371	greg	2.1	return(-1);
372	greg	2.16	cv.uv[i] = (uint32)(4294967296. *
373	greg	2.2	(vp->uv[i] - mp->uvlim[0][i]) /
374			(mp->uvlim[1][i] - mp->uvlim[0][i]));
375	greg	2.1	}
376			cv.fl = vp->fl;
377	greg	2.4	if (mp->lut.tsiz == 0) {
378			mp->lut.hashf = cvhash;
379			mp->lut.keycmp = cvcmp;
380			mp->lut.freek = free;
381			if (!lu_init(&mp->lut, 50000))
382	greg	2.1	goto nomem;
383			}
384			/* find entry */
385	greg	2.4	lvp = lu_find(&mp->lut, (char *)&cv);
386	greg	2.1	if (lvp == NULL)
387			goto nomem;
388			if (lvp->key == NULL) {
389	greg	2.8	lvp->key = (char *)malloc(sizeof(MCVERT)+sizeof(int32));
390	schorsch	2.9	memcpy((void )lvp->key, (void )&cv, sizeof(MCVERT));
391	greg	2.1	}
392			if (lvp->data == NULL) { /* new vertex */
393	greg	2.24	MESHPATCH *pp;
394	greg	2.1	if (mp->npatches <= 0) {
395			mp->patch = (MESHPATCH *)calloc(MPATCHBLKSIZ,
396			sizeof(MESHPATCH));
397			if (mp->patch == NULL)
398			goto nomem;
399			mp->npatches = 1;
400			} else if (mp->patch[mp->npatches-1].nverts >= 256) {
401			if (mp->npatches % MPATCHBLKSIZ == 0) {
402			mp->patch = (MESHPATCH *)realloc(
403			(void *)mp->patch,
404			(mp->npatches + MPATCHBLKSIZ)*
405			sizeof(MESHPATCH));
406	schorsch	2.9	memset((void *)(mp->patch + mp->npatches), '\0',
407	greg	2.1	MPATCHBLKSIZ*sizeof(MESHPATCH));
408			}
409	greg	2.2	if (mp->npatches++ >= 1L<<22)
410	greg	2.1	error(INTERNAL, "too many mesh patches");
411			}
412			pp = &mp->patch[mp->npatches-1];
413			if (pp->xyz == NULL) {
414	greg	2.8	pp->xyz = (uint32 ()[3])calloc(256, 3sizeof(int32));
415	greg	2.1	if (pp->xyz == NULL)
416			goto nomem;
417			}
418			for (i = 0; i < 3; i++)
419			pp->xyz[pp->nverts][i] = cv.xyz[i];
420			if (cv.fl & MT_N) {
421			if (pp->norm == NULL) {
422	greg	2.8	pp->norm = (int32 *)calloc(256, sizeof(int32));
423	greg	2.1	if (pp->norm == NULL)
424			goto nomem;
425			}
426			pp->norm[pp->nverts] = cv.norm;
427			}
428			if (cv.fl & MT_UV) {
429			if (pp->uv == NULL) {
430	greg	2.16	pp->uv = (uint32 (*)[2])calloc(256,
431			2*sizeof(uint32));
432	greg	2.1	if (pp->uv == NULL)
433			goto nomem;
434			}
435			for (i = 0; i < 2; i++)
436			pp->uv[pp->nverts][i] = cv.uv[i];
437			}
438			pp->nverts++;
439			lvp->data = lvp->key + sizeof(MCVERT);
440	greg	2.8	(int32 )lvp->data = (mp->npatches-1) << 8 \| (pp->nverts-1);
441	greg	2.1	}
442	greg	2.8	return((int32 )lvp->data);
443	greg	2.1	nomem:
444			error(SYSTEM, "out of memory in addmeshvert");
445			return(-1);
446			}
447
448
449			OBJECT
450	greg	2.24	addmeshtri( /* add a new mesh triangle */
451			MESH *mp,
452			MESHVERT tv[3],
453			OBJECT mo
454			)
455	greg	2.1	{
456	greg	2.8	int32 vid[3], t;
457	greg	2.1	int pn[3], i;
458	greg	2.24	MESHPATCH *pp;
459	greg	2.1
460			if (!(tv[0].fl & tv[1].fl & tv[2].fl & MT_V))
461			return(OVOID);
462			/* find/allocate patch vertices */
463			for (i = 0; i < 3; i++) {
464			if ((vid[i] = addmeshvert(mp, &tv[i])) < 0)
465			return(OVOID);
466			pn[i] = vid[i] >> 8;
467			}
468	greg	2.4	/* normalize material index */
469	schorsch	2.13	if (mo != OVOID) {
470	greg	2.4	if ((mo -= mp->mat0) >= mp->nmats)
471			mp->nmats = mo+1;
472			else if (mo < 0)
473			error(INTERNAL, "modifier range error in addmeshtri");
474	schorsch	2.13	}
475	greg	2.1	/* assign triangle */
476			if (pn[0] == pn[1] && pn[1] == pn[2]) { /* local case */
477			pp = &mp->patch[pn[0]];
478			if (pp->tri == NULL) {
479			pp->tri = (struct PTri *)malloc(
480			512*sizeof(struct PTri));
481			if (pp->tri == NULL)
482			goto nomem;
483			}
484	greg	2.2	if (pp->ntris < 512) {
485			pp->tri[pp->ntris].v1 = vid[0] & 0xff;
486			pp->tri[pp->ntris].v2 = vid[1] & 0xff;
487			pp->tri[pp->ntris].v3 = vid[2] & 0xff;
488	greg	2.4	if (pp->ntris == 0)
489			pp->solemat = mo;
490			else if (pp->trimat == NULL && mo != pp->solemat) {
491	greg	2.8	pp->trimat = (int16 *)malloc(
492			512*sizeof(int16));
493	greg	2.4	if (pp->trimat == NULL)
494			goto nomem;
495			for (i = pp->ntris; i--; )
496			pp->trimat[i] = pp->solemat;
497			}
498			if (pp->trimat != NULL)
499			pp->trimat[pp->ntris] = mo;
500	greg	2.2	return(pn[0] << 10 \| pp->ntris++);
501			}
502	greg	2.1	}
503			if (pn[0] == pn[1]) {
504	greg	2.2	t = vid[2]; vid[2] = vid[1]; vid[1] = vid[0]; vid[0] = t;
505			i = pn[2]; pn[2] = pn[1]; pn[1] = pn[0]; pn[0] = i;
506	greg	2.1	} else if (pn[0] == pn[2]) {
507	greg	2.2	t = vid[0]; vid[0] = vid[1]; vid[1] = vid[2]; vid[2] = t;
508			i = pn[0]; pn[0] = pn[1]; pn[1] = pn[2]; pn[2] = i;
509	greg	2.1	}
510			if (pn[1] == pn[2]) { /* single link */
511			pp = &mp->patch[pn[1]];
512			if (pp->j1tri == NULL) {
513			pp->j1tri = (struct PJoin1 *)malloc(
514			256*sizeof(struct PJoin1));
515			if (pp->j1tri == NULL)
516			goto nomem;
517			}
518	greg	2.2	if (pp->nj1tris < 256) {
519			pp->j1tri[pp->nj1tris].v1j = vid[0];
520			pp->j1tri[pp->nj1tris].v2 = vid[1] & 0xff;
521			pp->j1tri[pp->nj1tris].v3 = vid[2] & 0xff;
522	greg	2.4	pp->j1tri[pp->nj1tris].mat = mo;
523	greg	2.2	return(pn[1] << 10 \| 0x200 \| pp->nj1tris++);
524			}
525	greg	2.1	}
526			/* double link */
527			pp = &mp->patch[pn[2]];
528			if (pp->j2tri == NULL) {
529			pp->j2tri = (struct PJoin2 *)malloc(
530			256*sizeof(struct PJoin2));
531			if (pp->j2tri == NULL)
532			goto nomem;
533			}
534			if (pp->nj2tris >= 256)
535	greg	2.2	error(INTERNAL, "too many patch triangles in addmeshtri");
536			pp->j2tri[pp->nj2tris].v1j = vid[0];
537			pp->j2tri[pp->nj2tris].v2j = vid[1];
538	greg	2.1	pp->j2tri[pp->nj2tris].v3 = vid[2] & 0xff;
539	greg	2.4	pp->j2tri[pp->nj2tris].mat = mo;
540	greg	2.1	return(pn[2] << 10 \| 0x300 \| pp->nj2tris++);
541			nomem:
542			error(SYSTEM, "out of memory in addmeshtri");
543			return(OVOID);
544			}
545
546
547	greg	2.4	char *
548	greg	2.24	checkmesh(MESH mp) / validate mesh data */
549	greg	2.4	{
550			static char embuf[128];
551			int nouvbounds = 1;
552	greg	2.24	int i;
553	greg	2.4	/* basic checks */
554			if (mp == NULL)
555			return("NULL mesh pointer");
556			if (!mp->ldflags)
557			return("unassigned mesh");
558			if (mp->name == NULL)
559			return("missing mesh name");
560			if (mp->nref <= 0)
561			return("unreferenced mesh");
562			/* check boundaries */
563			if (mp->ldflags & IO_BOUNDS) {
564			if (mp->mcube.cusize <= FTINY)
565			return("illegal octree bounds in mesh");
566	greg	2.5	nouvbounds = (mp->uvlim[1][0] - mp->uvlim[0][0] <= FTINY \|\|
567			mp->uvlim[1][1] - mp->uvlim[0][1] <= FTINY);
568	greg	2.4	}
569			/* check octree */
570			if (mp->ldflags & IO_TREE) {
571			if (isempty(mp->mcube.cutree))
572			error(WARNING, "empty mesh octree");
573			}
574			/* check scene data */
575			if (mp->ldflags & IO_SCENE) {
576			if (!(mp->ldflags & IO_BOUNDS))
577			return("unbounded scene in mesh");
578			if (mp->mat0 < 0 \|\| mp->mat0+mp->nmats > nobjects)
579			return("bad mesh modifier range");
580			for (i = mp->mat0+mp->nmats; i-- > mp->mat0; ) {
581			int otyp = objptr(i)->otype;
582			if (!ismodifier(otyp)) {
583			sprintf(embuf,
584			"non-modifier in mesh (%s \"%s\")",
585			ofun[otyp].funame, objptr(i)->oname);
586			return(embuf);
587			}
588			}
589			if (mp->npatches <= 0)
590			error(WARNING, "no patches in mesh");
591			for (i = 0; i < mp->npatches; i++) {
592	greg	2.24	MESHPATCH *pp = &mp->patch[i];
593	greg	2.4	if (pp->nverts <= 0)
594			error(WARNING, "no vertices in patch");
595			else {
596			if (pp->xyz == NULL)
597			return("missing patch vertex list");
598			if (nouvbounds && pp->uv != NULL)
599			return("unreferenced uv coordinates");
600			}
601			if (pp->ntris > 0 && pp->tri == NULL)
602			return("missing patch triangle list");
603			if (pp->nj1tris > 0 && pp->j1tri == NULL)
604			return("missing patch joiner triangle list");
605			if (pp->nj2tris > 0 && pp->j2tri == NULL)
606			return("missing patch double-joiner list");
607			}
608			}
609			return(NULL); /* seems OK */
610			}
611
612
613	greg	2.1	static void
614	greg	2.24	tallyoctree( /* tally octree size */
615			OCTREE ot,
616			int *ecp,
617			int *lcp,
618			int *ocp
619			)
620	greg	2.1	{
621			int i;
622
623			if (isempty(ot)) {
624			(*ecp)++;
625			return;
626			}
627			if (isfull(ot)) {
628			OBJECT oset[MAXSET+1];
629			(*lcp)++;
630			objset(oset, ot);
631			*ocp += oset[0];
632			return;
633			}
634			for (i = 0; i < 8; i++)
635			tallyoctree(octkid(ot, i), ecp, lcp, ocp);
636			}
637
638
639			void
640	greg	2.24	printmeshstats( /* print out mesh statistics */
641			MESH *ms,
642			FILE *fp
643			)
644	greg	2.1	{
645			int lfcnt=0, lecnt=0, locnt=0;
646			int vcnt=0, ncnt=0, uvcnt=0;
647			int nscnt=0, uvscnt=0;
648			int tcnt=0, t1cnt=0, t2cnt=0;
649			int i, j;
650
651			tallyoctree(ms->mcube.cutree, &lecnt, &lfcnt, &locnt);
652			for (i = 0; i < ms->npatches; i++) {
653	greg	2.24	MESHPATCH *pp = &ms->patch[i];
654	greg	2.1	vcnt += pp->nverts;
655			if (pp->norm != NULL) {
656			for (j = pp->nverts; j--; )
657			if (pp->norm[j])
658			ncnt++;
659			nscnt += pp->nverts;
660			}
661			if (pp->uv != NULL) {
662			for (j = pp->nverts; j--; )
663			if (pp->uv[j][0])
664			uvcnt++;
665			uvscnt += pp->nverts;
666			}
667			tcnt += pp->ntris;
668			t1cnt += pp->nj1tris;
669			t2cnt += pp->nj2tris;
670			}
671			fprintf(fp, "Mesh statistics:\n");
672	greg	2.22	fprintf(fp, "\t%ld materials\n", (long)ms->nmats);
673	greg	2.1	fprintf(fp, "\t%d patches (%.2f MBytes)\n", ms->npatches,
674			(ms->npatches*sizeof(MESHPATCH) +
675	greg	2.8	vcnt3sizeof(uint32) +
676			nscnt*sizeof(int32) +
677	greg	2.16	uvscnt2sizeof(uint32) +
678	greg	2.1	tcnt*sizeof(struct PTri) +
679			t1cnt*sizeof(struct PJoin1) +
680			t2cntsizeof(struct PJoin2))/(1024.1024.));
681			fprintf(fp, "\t%d vertices (%.1f%% w/ normals, %.1f%% w/ uv)\n",
682			vcnt, 100.ncnt/vcnt, 100.uvcnt/vcnt);
683			fprintf(fp, "\t%d triangles (%.1f%% local, %.1f%% joiner)\n",
684			tcnt+t1cnt+t2cnt,
685			100.*tcnt/(tcnt+t1cnt+t2cnt),
686			100.*t1cnt/(tcnt+t1cnt+t2cnt));
687			fprintf(fp,
688			"\t%d leaves in octree (%.1f%% empty, %.2f avg. set size)\n",
689			lfcnt+lecnt, 100.*lecnt/(lfcnt+lecnt),
690			(double)locnt/lfcnt);
691			}
692
693
694			void
695	greg	2.24	freemesh(MESH ms) / free mesh data */
696	greg	2.1	{
697			MESH mhead;
698			MESH *msp;
699
700			if (ms == NULL)
701			return;
702			if (ms->nref <= 0)
703			error(CONSISTENCY, "unreferenced mesh in freemesh");
704			ms->nref--;
705			if (ms->nref) /* still in use */
706			return;
707			/* else remove from list */
708			mhead.next = mlist;
709			for (msp = &mhead; msp->next != NULL; msp = msp->next)
710			if (msp->next == ms) {
711			msp->next = ms->next;
712			ms->next = NULL;
713			break;
714			}
715			if (ms->next != NULL) /* can't be in list anymore */
716			error(CONSISTENCY, "unlisted mesh in freemesh");
717			mlist = mhead.next;
718			/* free mesh data */
719			freestr(ms->name);
720			octfree(ms->mcube.cutree);
721	greg	2.4	lu_done(&ms->lut);
722	greg	2.1	if (ms->npatches > 0) {
723	greg	2.24	MESHPATCH *pp = ms->patch + ms->npatches;
724	greg	2.1	while (pp-- > ms->patch) {
725			if (pp->j2tri != NULL)
726			free((void *)pp->j2tri);
727			if (pp->j1tri != NULL)
728			free((void *)pp->j1tri);
729			if (pp->tri != NULL)
730			free((void *)pp->tri);
731			if (pp->uv != NULL)
732			free((void *)pp->uv);
733			if (pp->norm != NULL)
734			free((void *)pp->norm);
735			if (pp->xyz != NULL)
736			free((void *)pp->xyz);
737			}
738			free((void *)ms->patch);
739			}
740	greg	2.4	if (ms->pseudo != NULL)
741			free((void *)ms->pseudo);
742	greg	2.1	free((void *)ms);
743			}
744
745
746			void
747	greg	2.24	freemeshinst(OBJREC o) / free mesh instance */
748	greg	2.1	{
749			if (o->os == NULL)
750			return;
751			freemesh(((MESHINST )o->os).msh);
752			free((void *)o->os);
753			o->os = NULL;
754			}