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 "serverscripting.h"
  25 #include "server.h"
  26 #include "daynightratio.h"
  27 #include "emerge.h"
  28
  29 Environment::Environment(IGameDef *gamedef):
  30         m_time_of_day_speed(0),
  31         m_time_of_day(9000),
  32         m_time_of_day_f(9000./24000),
  33         m_time_conversion_skew(0.0f),
  34         m_enable_day_night_ratio_override(false),
  35         m_day_night_ratio_override(0.0f),
  36         m_gamedef(gamedef)
  37 {
  38         m_cache_enable_shaders = g_settings->getBool("enable_shaders");
  39         m_cache_active_block_mgmt_interval = g_settings->getFloat("active_block_mgmt_interval");
  40         m_cache_abm_interval = g_settings->getFloat("abm_interval");
  41         m_cache_nodetimer_interval = g_settings->getFloat("nodetimer_interval");
  42 }
  43
  44 Environment::~Environment()
  45 {
  46 }
  47
  48 u32 Environment::getDayNightRatio()
  49 {
  50         MutexAutoLock lock(this->m_time_lock);
  51         if (m_enable_day_night_ratio_override)
  52                 return m_day_night_ratio_override;
  53         return time_to_daynight_ratio(m_time_of_day_f * 24000, m_cache_enable_shaders);
  54 }
  55
  56 void Environment::setTimeOfDaySpeed(float speed)
  57 {
  58         m_time_of_day_speed = speed;
  59 }
  60
  61 void Environment::setDayNightRatioOverride(bool enable, u32 value)
  62 {
  63         MutexAutoLock lock(this->m_time_lock);
  64         m_enable_day_night_ratio_override = enable;
  65         m_day_night_ratio_override = value;
  66 }
  67
  68 void Environment::setTimeOfDay(u32 time)
  69 {
  70         MutexAutoLock lock(this->m_time_lock);
  71         if (m_time_of_day > time)
  72                 m_day_count++;
  73         m_time_of_day = time;
  74         m_time_of_day_f = (float)time / 24000.0;
  75 }
  76
  77 u32 Environment::getTimeOfDay()
  78 {
  79         MutexAutoLock lock(this->m_time_lock);
  80         return m_time_of_day;
  81 }
  82
  83 float Environment::getTimeOfDayF()
  84 {
  85         MutexAutoLock lock(this->m_time_lock);
  86         return m_time_of_day_f;
  87 }
  88
  89 void Environment::stepTimeOfDay(float dtime)
  90 {
  91         MutexAutoLock lock(this->m_time_lock);
  92
  93         // Cached in order to prevent the two reads we do to give
  94         // different results (can be written by code not under the lock)
  95         f32 cached_time_of_day_speed = m_time_of_day_speed;
  96
  97         f32 speed = cached_time_of_day_speed * 24000. / (24. * 3600);
  98         m_time_conversion_skew += dtime;
  99         u32 units = (u32)(m_time_conversion_skew * speed);
 100         bool sync_f = false;
 101         if (units > 0) {
 102                 // Sync at overflow
 103                 if (m_time_of_day + units >= 24000) {
 104                         sync_f = true;
 105                         m_day_count++;
 106                 }
 107                 m_time_of_day = (m_time_of_day + units) % 24000;
 108                 if (sync_f)
 109                         m_time_of_day_f = (float)m_time_of_day / 24000.0;
 110         }
 111         if (speed > 0) {
 112                 m_time_conversion_skew -= (f32)units / speed;
 113         }
 114         if (!sync_f) {
 115                 m_time_of_day_f += cached_time_of_day_speed / 24 / 3600 * dtime;
 116                 if (m_time_of_day_f > 1.0)
 117                         m_time_of_day_f -= 1.0;
 118                 if (m_time_of_day_f < 0.0)
 119                         m_time_of_day_f += 1.0;
 120         }
 121 }
 122
 123 u32 Environment::getDayCount()
 124 {
 125         // Atomic<u32> counter
 126         return m_day_count;
 127 }