FIFE 2008.0
timemanager.cpp
00001 /***************************************************************************
00002  *   Copyright (C) 2005-2008 by the FIFE team                              *
00003  *   http://www.fifengine.de                                               *
00004  *   This file is part of FIFE.                                            *
00005  *                                                                         *
00006  *   FIFE is free software; you can redistribute it and/or                 *
00007  *   modify it under the terms of the GNU Lesser General Public            *
00008  *   License as published by the Free Software Foundation; either          *
00009  *   version 2.1 of the License, or (at your option) any later version.    *
00010  *                                                                         *
00011  *   This library is distributed in the hope that it will be useful,       *
00012  *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
00013  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU     *
00014  *   Lesser General Public License for more details.                       *
00015  *                                                                         *
00016  *   You should have received a copy of the GNU Lesser General Public      *
00017  *   License along with this library; if not, write to the                 *
00018  *   Free Software Foundation, Inc.,                                       *
00019  *   51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA          *
00020  ***************************************************************************/
00021 
00022 // Standard C++ library includes
00023 #include <algorithm>
00024 #include <cassert>
00025 
00026 // 3rd party library includes
00027 #include <SDL.h>
00028 
00029 // FIFE includes
00030 // These includes are split up in two parts, separated by one empty line
00031 // First block: files included from the FIFE root src directory
00032 // Second block: files included from the same folder
00033 #include "util/log/logger.h"
00034 
00035 #include "timeevent.h"
00036 #include "timemanager.h"
00037 
00038 namespace FIFE {
00039     static const unsigned long UNDEFINED_TIME_DELTA = 999999;
00040     static Logger _log(LM_UTIL);
00041     
00042     TimeManager::TimeManager():
00043         m_current_time (0),
00044         m_time_delta(UNDEFINED_TIME_DELTA),
00045         m_average_frame_time(0) {
00046     }
00047 
00048     TimeManager::~TimeManager() {
00049     }
00050 
00051     void TimeManager::update() {
00052         // if first update...
00053         double avg_multiplier = 0.985;
00054         if (m_current_time == 0) {
00055             m_current_time = SDL_GetTicks();
00056             avg_multiplier = 0;
00057             m_time_delta = 0;
00058         } else {
00059             m_time_delta = m_current_time;
00060             m_current_time = SDL_GetTicks();
00061             m_time_delta = m_current_time - m_time_delta;
00062         }
00063         m_average_frame_time = m_average_frame_time * avg_multiplier +
00064             double(m_time_delta) * (1.0 - avg_multiplier);
00065 
00066         // Update live events.
00067         //
00068         // It is very important to NOT use iterators (over a vector)
00069         // here, as an event might add enough events to resize the vector.
00070         // -> Ugly segfault
00071         for (size_t i = 0; i < m_events_list.size(); ++i) {
00072             TimeEvent* event = m_events_list[ i ];
00073             if( event ) {
00074                 event->managerUpdateEvent(m_current_time);
00075             }
00076         }
00077 
00078         // Remove dead events
00079         std::vector<TimeEvent*>::iterator it;
00080         it = std::remove( m_events_list.begin(), m_events_list.end(), static_cast<TimeEvent*>(0));
00081         m_events_list.erase( it, m_events_list.end());
00082     }
00083 
00084     void TimeManager::registerEvent(TimeEvent* event) {
00085         // Register.
00086         m_events_list.push_back(event);
00087     }
00088 
00089     void TimeManager::unregisterEvent(TimeEvent* event) {
00090         // Unregister.
00091         for (size_t i = 0; i < m_events_list.size(); ++i) {
00092             TimeEvent*& event_i = m_events_list[ i ];
00093             if( event_i == event) {
00094                 event_i = 0;
00095                 return;
00096             }
00097         }
00098     }
00099 
00100     unsigned long TimeManager::getTime() const {
00101         return m_current_time;
00102     }
00103 
00104     unsigned long TimeManager::getTimeDelta() const {
00105         return m_time_delta;
00106     }
00107 
00108     double TimeManager::getAverageFrameTime() const {
00109         return m_average_frame_time;
00110     }
00111 
00112     void TimeManager::printStatistics() const {
00113         FL_LOG(_log, LMsg("Timers: ") << m_events_list.size());
00114     }
00115 
00116 } //FIFE
00117 
00118 
 All Classes Namespaces Functions Variables Enumerations Enumerator