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/*************************************************************************
* Copyright (C) 2009 Tavian Barnes <tavianator@gmail.com> *
* *
* This file is part of The Dimension Library. *
* *
* The Dimension Library is free software; you can redistribute it and/ *
* or modify it under the terms of the GNU Lesser General Public License *
* as published by the Free Software Foundation; either version 3 of the *
* License, or (at your option) any later version. *
* *
* The Dimension Library 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 *
* Lesser General Public License for more details. *
* *
* You should have received a copy of the GNU Lesser General Public *
* License along with this program. If not, see *
* <http://www.gnu.org/licenses/>. *
*************************************************************************/
/*
* Bounding Volume Splay Trees for storing object bounding boxes.
* Each node's bounding box entirely contains the bounding boxes of the nodes
* to its left, and is entirely contained by the bounding boxes of the nodes to
* its right. Splay trees are used for the implementation, to bring commonly-
* used objects (the most recent object which a ray has hit) near the root of
* the tree for fast access. Object's bounding boxes are expanded as needed
* when inserted into the tree: if they intersect an existing bounding box, they
* are expanded to contain it.
*/
#ifndef DIMENSION_IMPL_BVST_H
#define DIMENSION_IMPL_BVST_H
typedef struct dmnsn_bvst dmnsn_bvst;
typedef struct dmnsn_bvst_node dmnsn_bvst_node;
struct dmnsn_bvst {
dmnsn_bvst_node *root;
};
struct dmnsn_bvst_node {
/* Tree children */
dmnsn_bvst_node *contains, *container;
/* Parent node for easy backtracking */
dmnsn_bvst_node *parent;
/* Bounding box corners */
dmnsn_vector min, max;
/* Node payload */
dmnsn_object *object;
};
dmnsn_bvst *dmnsn_new_bvst();
dmnsn_bvst *dmnsn_bvst_copy(dmnsn_bvst *tree);
void dmnsn_delete_bvst(dmnsn_bvst *tree);
void dmnsn_bvst_insert(dmnsn_bvst *tree, dmnsn_object *object);
void dmnsn_bvst_splay(dmnsn_bvst *tree, dmnsn_bvst_node *node);
dmnsn_intersection *dmnsn_bvst_search(dmnsn_bvst *tree, dmnsn_line ray);
#endif /* DIMENSION_IMPL_BVST_H */
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