trace.cpp

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/*
Copyright (C) 1997-2001 Id Software, Inc.

This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.

*/


#include "shared.h"
#include "../bsp.h"
#include "bspfile.h"

void MakeTracingNodes (int levels)
{
    /* Release any memory we have for existing tnodes, just in case. */
    CloseTracingNodes();

    /* allocate memory for the tnodes structure */
    tnode_t* tnode = curTile->tnodes = Mem_AllocTypeN(tnode_t, curTile->numnodes + 1);
    curTile->numtheads = 0;

    for (int i = 0; i < levels; i++) {
        const dBspModel_t* model = &curTile->models[i];
        if (!model->numfaces && i != LEVEL_LIGHTCLIP && i != LEVEL_ACTORCLIP)
            continue;
        if (model->headnode < 0)    /* empty models have headnode -1 */
            continue;
        curTile->thead[curTile->numtheads] = tnode - curTile->tnodes;
        curTile->theadlevel[curTile->numtheads] = i;
        curTile->numtheads++;
        assert(curTile->numtheads < LEVEL_MAX);
        TR_BuildTracingNode_r(curTile, &tnode, model->headnode, i);
    }
}

void CloseTracingNodes (void)
{
    Mem_Free(curTile->tnodes);
    curTile->tnodes = nullptr;
}