Re: Fix to Inventor Loader for Large Databases

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Jim Helman (jimh++at++surreal)
Fri, 19 May 95 08:00:59 -0700

Whoops. The freeTris() routine needed to be changed as well,
since it makes assumptions about the chunksize. Here's the
complete fix.

rgds,

-jim helman

jimh++at++surreal.asd.sgi.com
415/390-1151

#define TRICHUNK 128 /* initial allocation size */
#define MAXTRICHUNK 8192 /* maximum allocation size */

static void
freeTris(pfdGeoBuilder *bldr)
{
    pfdPrim *tri;
    int chunkSize = TRICHUNK;
    static int FreedTris = 0;

    /* Free linked list of triangle chunks */
    tri = bldr->triList;
    do
    {
        pfdPrim *next;

        next = tri[chunkSize-1].next;
        pfFree(tri);
        FreedTris++;
        tri = next;

        chunkSize <<= 1;

        if (chunkSize > MAXTRICHUNK)
            chunkSize >>= 1;
    } while (tri != bldr->triList);
}

static pfdPrim *
getPrim(pfdGeoBuilder *bldr)
{
    pfdPrim *t = NULL;
    int chunkSize = TRICHUNK;
    int newChunkSize = 0;

    /*
     * Create and link in a new chunk of triangles whose size is twice
     * the size of the previous chunk. Use last triangle in chunk as link.
    */
    if (bldr->availTri->flags == LINK_TRI)
    {
            if (bldr->availTri->next == bldr->triList)
        {
            /* determine old chunk size */
            t = bldr->triList;
            while (&t[chunkSize-1] != bldr->availTri)
            {
                t = t[chunkSize-1].next;
                chunkSize <<= 1;

                if (chunkSize > MAXTRICHUNK)
                    chunkSize >>= 1;
            }

            /* determine new chunk size */
            newChunkSize = chunkSize << 1;

            if (newChunkSize > MAXTRICHUNK)
                newChunkSize >>= 1;

            bldr->availTri = t[chunkSize-1].next =
                pfCalloc(newChunkSize, sizeof(pfdPrim), NULL);
            pfAdd(bldr->mallocList,bldr->availTri);

            /* Point last tri in chunk to head of linked list */
            t = &bldr->availTri[newChunkSize-1];
            t->next = bldr->triList;
            t->flags = LINK_TRI;
        }
            else
            bldr->availTri = bldr->availTri->next;
    }

    t = bldr->availTri;
    bldr->availTri++;
    return t;
}

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