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