The Quake 2 tools as originally released under the GPL license.

bsp/qbsp3/tree.c

@@ -0,0 +1,219 @@
+/*
+===========================================================================
+Copyright (C) 1997-2006 Id Software, Inc.
+
+This file is part of Quake 2 Tools source code.
+
+Quake 2 Tools source code 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.
+
+Quake 2 Tools source code 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 Quake 2 Tools source code; if not, write to the Free Software
+Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+===========================================================================
+*/
+#include "qbsp.h"
+
+extern	int	c_nodes;
+
+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)
+{
+	face_t		*f, *nextf;
+
+	// free children
+	if (node->planenum != PLANENUM_LEAF)
+	{
+		FreeTree_r (node->children[0]);
+		FreeTree_r (node->children[1]);
+	}
+
+	// free bspbrushes
+	FreeBrushList (node->brushlist);
+
+	// free faces
+	for (f=node->faces ; f ; f=nextf)
+	{
+		nextf = f->next;
+		FreeFace (f);
+	}
+
+	// free the node
+	if (node->volume)
+		FreeBrush (node->volume);
+
+	if (numthreads == 1)
+		c_nodes--;
+	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;
+	bspbrush_t	*bb;
+
+	for (i=0 ; i<depth ; i++)
+		printf ("  ");
+	if (node->planenum == PLANENUM_LEAF)
+	{
+		if (!node->brushlist)
+			printf ("NULL\n");
+		else
+		{
+			for (bb=node->brushlist ; bb ; bb=bb->next)
+				printf ("%i ", bb->original->brushnum);
+			printf ("\n");
+		}
+		return;
+	}
+
+	plane = &mapplanes[node->planenum];
+	printf ("#%i (%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);
+}
+
+/*
+=========================================================
+
+NODES THAT DON'T SEPERATE DIFFERENT CONTENTS CAN BE PRUNED
+
+=========================================================
+*/
+
+int	c_pruned;
+
+/*
+============
+PruneNodes_r
+============
+*/
+void PruneNodes_r (node_t *node)
+{
+	bspbrush_t		*b, *next;
+
+	if (node->planenum == PLANENUM_LEAF)
+		return;
+	PruneNodes_r (node->children[0]);
+	PruneNodes_r (node->children[1]);
+
+	if ( (node->children[0]->contents & CONTENTS_SOLID)
+	&& (node->children[1]->contents & CONTENTS_SOLID) )
+	{
+		if (node->faces)
+			Error ("node->faces seperating CONTENTS_SOLID");
+		if (node->children[0]->faces || node->children[1]->faces)
+			Error ("!node->faces with children");
+
+		// FIXME: free stuff
+		node->planenum = PLANENUM_LEAF;
+		node->contents = CONTENTS_SOLID;
+		node->detail_seperator = false;
+
+		if (node->brushlist)
+			Error ("PruneNodes: node->brushlist");
+
+		// combine brush lists
+		node->brushlist = node->children[1]->brushlist;
+
+		for (b=node->children[0]->brushlist ; b ; b=next)
+		{
+			next = b->next;
+			b->next = node->brushlist;
+			node->brushlist = b;
+		}
+
+		c_pruned++;
+	}
+}
+
+
+void PruneNodes (node_t *node)
+{
+	qprintf ("--- PruneNodes ---\n");
+	c_pruned = 0;
+	PruneNodes_r (node);
+	qprintf ("%5i pruned nodes\n", c_pruned);
+}
+
+//===========================================================