src/environment.cpp

   1 /*
   2 Minetest
   3 Copyright (C) 2010-2013 celeron55, Perttu Ahola <celeron55@gmail.com>
   4
   5 This program is free software; you can redistribute it and/or modify
   6 it under the terms of the GNU Lesser General Public License as published by
   7 the Free Software Foundation; either version 2.1 of the License, or
   8 (at your option) any later version.
   9
  10 This program is distributed in the hope that it will be useful,
  11 but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 GNU Lesser General Public License for more details.
  14
  15 You should have received a copy of the GNU Lesser General Public License along
  16 with this program; if not, write to the Free Software Foundation, Inc.,
  17 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  18 */
  19
  20 #include <fstream>
  21 #include "environment.h"
  22 #include "collision.h"
  23 #include "serverobject.h"
  24 #include "scripting_server.h"
  25 #include "server.h"
  26 #include "daynightratio.h"
  27 #include "emerge.h"
  28
  29
  30 Environment::Environment(IGameDef *gamedef):
  31         m_time_of_day_speed(0),
  32         m_time_of_day(9000),
  33         m_time_of_day_f(9000./24000),
  34         m_time_conversion_skew(0.0f),
  35         m_enable_day_night_ratio_override(false),
  36         m_day_night_ratio_override(0.0f),
  37         m_gamedef(gamedef)
  38 {
  39         m_cache_enable_shaders = g_settings->getBool("enable_shaders");
  40         m_cache_active_block_mgmt_interval = g_settings->getFloat("active_block_mgmt_interval");
  41         m_cache_abm_interval = g_settings->getFloat("abm_interval");
  42         m_cache_nodetimer_interval = g_settings->getFloat("nodetimer_interval");
  43 }
  44
  45 Environment::~Environment()
  46 {
  47 }
  48
  49 u32 Environment::getDayNightRatio()
  50 {
  51         MutexAutoLock lock(this->m_time_lock);
  52         if (m_enable_day_night_ratio_override)
  53                 return m_day_night_ratio_override;
  54         return time_to_daynight_ratio(m_time_of_day_f * 24000, m_cache_enable_shaders);
  55 }
  56
  57 void Environment::setTimeOfDaySpeed(float speed)
  58 {
  59         m_time_of_day_speed = speed;
  60 }
  61
  62 void Environment::setDayNightRatioOverride(bool enable, u32 value)
  63 {
  64         MutexAutoLock lock(this->m_time_lock);
  65         m_enable_day_night_ratio_override = enable;
  66         m_day_night_ratio_override = value;
  67 }
  68
  69 void Environment::setTimeOfDay(u32 time)
  70 {
  71         MutexAutoLock lock(this->m_time_lock);
  72         if (m_time_of_day > time)
  73                 ++m_day_count;
  74         m_time_of_day = time;
  75         m_time_of_day_f = (float)time / 24000.0;
  76 }
  77
  78 u32 Environment::getTimeOfDay()
  79 {
  80         MutexAutoLock lock(this->m_time_lock);
  81         return m_time_of_day;
  82 }
  83
  84 float Environment::getTimeOfDayF()
  85 {
  86         MutexAutoLock lock(this->m_time_lock);
  87         return m_time_of_day_f;
  88 }
  89
  90 void Environment::stepTimeOfDay(float dtime)
  91 {
  92         MutexAutoLock lock(this->m_time_lock);
  93
  94         // Cached in order to prevent the two reads we do to give
  95         // different results (can be written by code not under the lock)
  96         f32 cached_time_of_day_speed = m_time_of_day_speed;
  97
  98         f32 speed = cached_time_of_day_speed * 24000. / (24. * 3600);
  99         m_time_conversion_skew += dtime;
 100         u32 units = (u32)(m_time_conversion_skew * speed);
 101         bool sync_f = false;
 102         if (units > 0) {
 103                 // Sync at overflow
 104                 if (m_time_of_day + units >= 24000) {
 105                         sync_f = true;
 106                         ++m_day_count;
 107                 }
 108                 m_time_of_day = (m_time_of_day + units) % 24000;
 109                 if (sync_f)
 110                         m_time_of_day_f = (float)m_time_of_day / 24000.0;
 111         }
 112         if (speed > 0) {
 113                 m_time_conversion_skew -= (f32)units / speed;
 114         }
 115         if (!sync_f) {
 116                 m_time_of_day_f += cached_time_of_day_speed / 24 / 3600 * dtime;
 117                 if (m_time_of_day_f > 1.0)
 118                         m_time_of_day_f -= 1.0;
 119                 if (m_time_of_day_f < 0.0)
 120                         m_time_of_day_f += 1.0;
 121         }
 122 }
 123
 124 u32 Environment::getDayCount()
 125 {
 126         // Atomic<u32> counter
 127         return m_day_count;
 128 }