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/*
Minetest
Copyright (C) 2018 numZero, Lobachevsky Vitaly <numzer0@yandex.com>
This program 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 2.1 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 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, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#pragma once
#include <unordered_set>
#include <unordered_map>
#include <vector>
#include "irr_v3d.h"
#include "irr_aabb3d.h"
class ServerActiveObject;
/*!
* The class to speed up collision tests.
*
* @note It stores any objects but only those that has valid collision box
* (`physical` Lua entities) are actually processed.
* @note It uses world coordinate units, i.e. node size is always BS.
*/
struct ServerActiveObjectMap
{
struct Wrapper
{
ServerActiveObject *object;
aabb3s16 box;
bool has_box;
};
/*!
* Adds object to the map. It must have valid ID.
*
* If an object with the same ID already exists in the map,
* std::logic_error is thrown.
*/
void addObject(ServerActiveObject *object);
/*!
* Removes object from the map. The pointer must be valid.
* See `removeObject(u16)` for details.
*/
void removeObject(ServerActiveObject *object);
/*!
* Removes object from the map.
*
* If the object is not found, the call is ignored.
* The function never throws, unless the underlying container throws.
*/
ServerActiveObject *removeObject(u16 id);
/*!
* Updates object metadata stored in the map.
* See `updateObject(u16)` for details.
*/
void updateObject(ServerActiveObject *object);
/*!
* Updates object metadata stored in the map.
*
* The metadata includes (approximate) absolute collision box and
* its existence (`physical` property for Lua entities).
* This function must be called after each change of these properties,
* including each object movement.
*/
void updateObject(u16 id);
/*!
* Returns the object with given ID, if any.
* Returns NULL otherwise.
*/
ServerActiveObject *getObject(u16 id) const;
/*!
* Checks if the given ID is free and valid (i.e. non-zero).
*/
bool isFreeId(u16 id);
/*!
* Returns a free ID, if any. Returns 0 in the case of failure.
*
* @note This function doesn't reserve the ID; it remains free until
* an object with that ID is added.
* @note This function tries to reclaim freed IDs as late as possible.
* However, there is no guarantee.
*/
u16 getFreeId();
/*!
* Returns a list of objects whose base position is at distance less
* than @p radius from @p pos.
*
* @note Due to inexact nature of floating-point computations, it is
* undefined whether an object lying exactly at the boundary is included
* in the list or not.
* @note Objects with base position outside of the collision box may not
* be returned.
* @note Objects without valid collision box are not returned.
*/
std::vector<u16> getObjectsInsideRadius(v3f pos, float radius);
/*!
* Returns a list of objects whose collision box intersects with @p box
*
* @note Due to inexact nature of floating-point computations, it is
* undefined whether an object lying exactly at the boundary is included
* in the list or not.
*/
std::vector<u16> getObjectsTouchingBox(const aabb3f &box);
/*!
* Returns count of objects in the map.
*/
std::size_t size() const { return objects.size(); }
/*!
* Returns reference to the underlying container.
*/
const std::unordered_map<u16, Wrapper> &getObjects() const { return objects; }
private:
void addObjectRefs(u16 id, const aabb3s16 &box);
void removeObjectRefs(u16 id, const aabb3s16 &box);
std::unordered_set<u16> getObjectsNearBox(const aabb3s16 &box);
std::unordered_map<u16, Wrapper> objects;
std::unordered_multimap<v3s16, u16> refmap;
};
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