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125 lines
3.6 KiB
C++
125 lines
3.6 KiB
C++
/*
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Minetest
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Copyright (C) 2010-2013 celeron55, Perttu Ahola <celeron55@gmail.com>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License along
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with this program; if not, write to the Free Software Foundation, Inc.,
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51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#pragma once
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#include "irr_v3d.h"
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#include <iostream>
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#include <map>
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#include <vector>
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/*
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NodeTimer provides per-node timed callback functionality.
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Can be used for:
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- Furnaces, to keep the fire burnin'
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- "activated" nodes that snap back to their original state
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after a fixed amount of time (mesecons buttons, for example)
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*/
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class NodeTimer
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{
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public:
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NodeTimer() = default;
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NodeTimer(const v3s16 &position_):
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position(position_) {}
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NodeTimer(f32 timeout_, f32 elapsed_, v3s16 position_):
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timeout(timeout_), elapsed(elapsed_), position(position_) {}
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~NodeTimer() = default;
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void serialize(std::ostream &os) const;
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void deSerialize(std::istream &is);
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f32 timeout = 0.0f;
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f32 elapsed = 0.0f;
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v3s16 position;
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};
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/*
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List of timers of all the nodes of a block
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*/
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class NodeTimerList
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{
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public:
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NodeTimerList() = default;
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~NodeTimerList() = default;
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void serialize(std::ostream &os, u8 map_format_version) const;
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void deSerialize(std::istream &is, u8 map_format_version);
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// Get timer
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NodeTimer get(const v3s16 &p) {
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std::map<v3s16, std::multimap<double, NodeTimer>::iterator>::iterator n =
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m_iterators.find(p);
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if (n == m_iterators.end())
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return NodeTimer();
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NodeTimer t = n->second->second;
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t.elapsed = t.timeout - (n->second->first - m_time);
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return t;
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}
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// Deletes timer
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void remove(v3s16 p) {
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std::map<v3s16, std::multimap<double, NodeTimer>::iterator>::iterator n =
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m_iterators.find(p);
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if(n != m_iterators.end()) {
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double removed_time = n->second->first;
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m_timers.erase(n->second);
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m_iterators.erase(n);
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// Yes, this is float equality, but it is not a problem
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// since we only test equality of floats as an ordered type
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// and thus we never lose precision
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if (removed_time == m_next_trigger_time) {
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if (m_timers.empty())
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m_next_trigger_time = -1.;
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else
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m_next_trigger_time = m_timers.begin()->first;
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}
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}
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}
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// Undefined behavior if there already is a timer
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void insert(const NodeTimer &timer) {
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v3s16 p = timer.position;
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double trigger_time = m_time + (double)(timer.timeout - timer.elapsed);
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std::multimap<double, NodeTimer>::iterator it = m_timers.emplace(trigger_time, timer);
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m_iterators.emplace(p, it);
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if (m_next_trigger_time == -1. || trigger_time < m_next_trigger_time)
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m_next_trigger_time = trigger_time;
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}
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// Deletes old timer and sets a new one
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inline void set(const NodeTimer &timer) {
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remove(timer.position);
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insert(timer);
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}
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// Deletes all timers
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void clear() {
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m_timers.clear();
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m_iterators.clear();
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m_next_trigger_time = -1.;
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}
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// Move forward in time, returns elapsed timers
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std::vector<NodeTimer> step(float dtime);
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private:
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std::multimap<double, NodeTimer> m_timers;
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std::map<v3s16, std::multimap<double, NodeTimer>::iterator> m_iterators;
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double m_next_trigger_time = -1.0;
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double m_time = 0.0;
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};
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