tree.c

/* -------------------------------------------------------------------------------

Copyright (C) 1999-2006 Id Software, Inc. and contributors.
For a list of contributors, see the accompanying CONTRIBUTORS file.

This file is part of GtkRadiant.

GtkRadiant 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.

GtkRadiant 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 GtkRadiant; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA

----------------------------------------------------------------------------------

This code has been altered significantly from its original form, to support
several games based on the Quake III Arena engine, in the form of "Q3Map2."

------------------------------------------------------------------------------- */



/* marker */
#define TREE_C



/* dependencies */
#include "kmap2.h"




void            RemovePortalFromNode(portal_t * portal, node_t * l);

node_t         *NodeForPoint(node_t * node, vec3_t origin)
{
	plane_t        *plane;
	vec_t           d;

	while(node->planenum != PLANENUM_LEAF)
	{
		plane = &mapplanes[node->planenum];
		d = DotProduct(origin, plane->normal) - plane->dist;
		if(d >= 0)
			node = node->children[0];
		else
			node = node->children[1];
	}

	return node;
}



/*
=============
FreeTreePortals_r
=============
*/
void FreeTreePortals_r(node_t * node)
{
	portal_t       *p, *nextp;
	int             s;

	// free children
	if(node->planenum != PLANENUM_LEAF)
	{
		FreeTreePortals_r(node->children[0]);
		FreeTreePortals_r(node->children[1]);
	}

	// free portals
	for(p = node->portals; p; p = nextp)
	{
		s = (p->nodes[1] == node);
		nextp = p->next[s];

		RemovePortalFromNode(p, p->nodes[!s]);
		FreePortal(p);
	}
	node->portals = NULL;
}

/*
=============
FreeTree_r
=============
*/
void FreeTree_r(node_t * node)
{
	// free children
	if(node->planenum != PLANENUM_LEAF)
	{
		FreeTree_r(node->children[0]);
		FreeTree_r(node->children[1]);
	}

	// free bspbrushes
	FreeBrushList(node->brushlist);

	// free the node
	if(node->volume)
		FreeBrush(node->volume);

	free(node);
}


/*
=============
FreeTree
=============
*/
void FreeTree(tree_t * tree)
{
	FreeTreePortals_r(tree->headnode);
	FreeTree_r(tree->headnode);
	free(tree);
}

//===============================================================

void PrintTree_r(node_t * node, int depth)
{
	int             i;
	plane_t        *plane;
	brush_t        *bb;

	for(i = 0; i < depth; i++)
		Sys_Printf("  ");
	if(node->planenum == PLANENUM_LEAF)
	{
		if(!node->brushlist)
			Sys_Printf("NULL\n");
		else
		{
			for(bb = node->brushlist; bb; bb = bb->next)
				Sys_Printf("%d ", bb->original->brushNum);
			Sys_Printf("\n");
		}
		return;
	}

	plane = &mapplanes[node->planenum];
	Sys_Printf("#%d (%5.2f %5.2f %5.2f):%5.2f\n", node->planenum,
			   plane->normal[0], plane->normal[1], plane->normal[2], plane->dist);
	PrintTree_r(node->children[0], depth + 1);
	PrintTree_r(node->children[1], depth + 1);
}