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/*
Minetest
Copyright (C) 2010-2013 celeron55, Perttu Ahola <celeron55@gmail.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 "irr_v3d.h"
#include <iostream>
#include <map>
#include <vector>
/*
NodeTimer provides per-node timed callback functionality.
Can be used for:
- Furnaces, to keep the fire burnin'
- "activated" nodes that snap back to their original state
after a fixed amount of time (mesecons buttons, for example)
*/
class NodeTimer
{
public:
NodeTimer() = default;
NodeTimer(const v3s16 &position_):
position(position_) {}
NodeTimer(f32 timeout_, f32 elapsed_, v3s16 position_):
timeout(timeout_), elapsed(elapsed_), position(position_) {}
~NodeTimer() = default;
void serialize(std::ostream &os) const;
void deSerialize(std::istream &is);
f32 timeout = 0.0f;
f32 elapsed = 0.0f;
v3s16 position;
};
/*
List of timers of all the nodes of a block
*/
class NodeTimerList
{
public:
NodeTimerList() = default;
~NodeTimerList() = default;
void serialize(std::ostream &os, u8 map_format_version) const;
void deSerialize(std::istream &is, u8 map_format_version);
// Get timer
NodeTimer get(const v3s16 &p) {
std::map<v3s16, std::multimap<double, NodeTimer>::iterator>::iterator n =
m_iterators.find(p);
if (n == m_iterators.end())
return NodeTimer();
NodeTimer t = n->second->second;
t.elapsed = t.timeout - (n->second->first - m_time);
return t;
}
// Deletes timer
void remove(v3s16 p) {
std::map<v3s16, std::multimap<double, NodeTimer>::iterator>::iterator n =
m_iterators.find(p);
if(n != m_iterators.end()) {
double removed_time = n->second->first;
m_timers.erase(n->second);
m_iterators.erase(n);
// Yes, this is float equality, but it is not a problem
// since we only test equality of floats as an ordered type
// and thus we never lose precision
if (removed_time == m_next_trigger_time) {
if (m_timers.empty())
m_next_trigger_time = -1.;
else
m_next_trigger_time = m_timers.begin()->first;
}
}
}
// Undefined behaviour if there already is a timer
void insert(NodeTimer timer) {
v3s16 p = timer.position;
double trigger_time = m_time + (double)(timer.timeout - timer.elapsed);
std::multimap<double, NodeTimer>::iterator it =
m_timers.insert(std::pair<double, NodeTimer>(
trigger_time, timer
));
m_iterators.insert(
std::pair<v3s16, std::multimap<double, NodeTimer>::iterator>(p, it));
if (m_next_trigger_time == -1. || trigger_time < m_next_trigger_time)
m_next_trigger_time = trigger_time;
}
// Deletes old timer and sets a new one
inline void set(const NodeTimer &timer) {
remove(timer.position);
insert(timer);
}
// Deletes all timers
void clear() {
m_timers.clear();
m_iterators.clear();
m_next_trigger_time = -1.;
}
// Move forward in time, returns elapsed timers
std::vector<NodeTimer> step(float dtime);
private:
std::multimap<double, NodeTimer> m_timers;
std::map<v3s16, std::multimap<double, NodeTimer>::iterator> m_iterators;
double m_next_trigger_time = -1.0;
double m_time = 0.0;
};
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