OpenTTD
date.cpp
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1 /* $Id: date.cpp 26482 2014-04-23 20:13:33Z rubidium $ */
2 
3 /*
4  * This file is part of OpenTTD.
5  * OpenTTD is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2.
6  * OpenTTD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
7  * See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
8  */
9 
12 #include "stdafx.h"
13 #include "network/network.h"
14 #include "network/network_func.h"
15 #include "currency.h"
16 #include "window_func.h"
17 #include "settings_type.h"
18 #include "date_func.h"
19 #include "vehicle_base.h"
20 #include "rail_gui.h"
21 #include "linkgraph/linkgraph.h"
22 #include "saveload/saveload.h"
23 
24 #include "safeguards.h"
25 
30 uint16 _tick_counter;
31 
37 void SetDate(Date date, DateFract fract)
38 {
39  assert(fract < DAY_TICKS);
40 
41  YearMonthDay ymd;
42 
43  _date = date;
44  _date_fract = fract;
45  ConvertDateToYMD(date, &ymd);
46  _cur_year = ymd.year;
47  _cur_month = ymd.month;
48 }
49 
50 #define M(a, b) ((a << 5) | b)
51 static const uint16 _month_date_from_year_day[] = {
52  M( 0, 1), M( 0, 2), M( 0, 3), M( 0, 4), M( 0, 5), M( 0, 6), M( 0, 7), M( 0, 8), M( 0, 9), M( 0, 10), M( 0, 11), M( 0, 12), M( 0, 13), M( 0, 14), M( 0, 15), M( 0, 16), M( 0, 17), M( 0, 18), M( 0, 19), M( 0, 20), M( 0, 21), M( 0, 22), M( 0, 23), M( 0, 24), M( 0, 25), M( 0, 26), M( 0, 27), M( 0, 28), M( 0, 29), M( 0, 30), M( 0, 31),
53  M( 1, 1), M( 1, 2), M( 1, 3), M( 1, 4), M( 1, 5), M( 1, 6), M( 1, 7), M( 1, 8), M( 1, 9), M( 1, 10), M( 1, 11), M( 1, 12), M( 1, 13), M( 1, 14), M( 1, 15), M( 1, 16), M( 1, 17), M( 1, 18), M( 1, 19), M( 1, 20), M( 1, 21), M( 1, 22), M( 1, 23), M( 1, 24), M( 1, 25), M( 1, 26), M( 1, 27), M( 1, 28), M( 1, 29),
54  M( 2, 1), M( 2, 2), M( 2, 3), M( 2, 4), M( 2, 5), M( 2, 6), M( 2, 7), M( 2, 8), M( 2, 9), M( 2, 10), M( 2, 11), M( 2, 12), M( 2, 13), M( 2, 14), M( 2, 15), M( 2, 16), M( 2, 17), M( 2, 18), M( 2, 19), M( 2, 20), M( 2, 21), M( 2, 22), M( 2, 23), M( 2, 24), M( 2, 25), M( 2, 26), M( 2, 27), M( 2, 28), M( 2, 29), M( 2, 30), M( 2, 31),
55  M( 3, 1), M( 3, 2), M( 3, 3), M( 3, 4), M( 3, 5), M( 3, 6), M( 3, 7), M( 3, 8), M( 3, 9), M( 3, 10), M( 3, 11), M( 3, 12), M( 3, 13), M( 3, 14), M( 3, 15), M( 3, 16), M( 3, 17), M( 3, 18), M( 3, 19), M( 3, 20), M( 3, 21), M( 3, 22), M( 3, 23), M( 3, 24), M( 3, 25), M( 3, 26), M( 3, 27), M( 3, 28), M( 3, 29), M( 3, 30),
56  M( 4, 1), M( 4, 2), M( 4, 3), M( 4, 4), M( 4, 5), M( 4, 6), M( 4, 7), M( 4, 8), M( 4, 9), M( 4, 10), M( 4, 11), M( 4, 12), M( 4, 13), M( 4, 14), M( 4, 15), M( 4, 16), M( 4, 17), M( 4, 18), M( 4, 19), M( 4, 20), M( 4, 21), M( 4, 22), M( 4, 23), M( 4, 24), M( 4, 25), M( 4, 26), M( 4, 27), M( 4, 28), M( 4, 29), M( 4, 30), M( 4, 31),
57  M( 5, 1), M( 5, 2), M( 5, 3), M( 5, 4), M( 5, 5), M( 5, 6), M( 5, 7), M( 5, 8), M( 5, 9), M( 5, 10), M( 5, 11), M( 5, 12), M( 5, 13), M( 5, 14), M( 5, 15), M( 5, 16), M( 5, 17), M( 5, 18), M( 5, 19), M( 5, 20), M( 5, 21), M( 5, 22), M( 5, 23), M( 5, 24), M( 5, 25), M( 5, 26), M( 5, 27), M( 5, 28), M( 5, 29), M( 5, 30),
58  M( 6, 1), M( 6, 2), M( 6, 3), M( 6, 4), M( 6, 5), M( 6, 6), M( 6, 7), M( 6, 8), M( 6, 9), M( 6, 10), M( 6, 11), M( 6, 12), M( 6, 13), M( 6, 14), M( 6, 15), M( 6, 16), M( 6, 17), M( 6, 18), M( 6, 19), M( 6, 20), M( 6, 21), M( 6, 22), M( 6, 23), M( 6, 24), M( 6, 25), M( 6, 26), M( 6, 27), M( 6, 28), M( 6, 29), M( 6, 30), M( 6, 31),
59  M( 7, 1), M( 7, 2), M( 7, 3), M( 7, 4), M( 7, 5), M( 7, 6), M( 7, 7), M( 7, 8), M( 7, 9), M( 7, 10), M( 7, 11), M( 7, 12), M( 7, 13), M( 7, 14), M( 7, 15), M( 7, 16), M( 7, 17), M( 7, 18), M( 7, 19), M( 7, 20), M( 7, 21), M( 7, 22), M( 7, 23), M( 7, 24), M( 7, 25), M( 7, 26), M( 7, 27), M( 7, 28), M( 7, 29), M( 7, 30), M( 7, 31),
60  M( 8, 1), M( 8, 2), M( 8, 3), M( 8, 4), M( 8, 5), M( 8, 6), M( 8, 7), M( 8, 8), M( 8, 9), M( 8, 10), M( 8, 11), M( 8, 12), M( 8, 13), M( 8, 14), M( 8, 15), M( 8, 16), M( 8, 17), M( 8, 18), M( 8, 19), M( 8, 20), M( 8, 21), M( 8, 22), M( 8, 23), M( 8, 24), M( 8, 25), M( 8, 26), M( 8, 27), M( 8, 28), M( 8, 29), M( 8, 30),
61  M( 9, 1), M( 9, 2), M( 9, 3), M( 9, 4), M( 9, 5), M( 9, 6), M( 9, 7), M( 9, 8), M( 9, 9), M( 9, 10), M( 9, 11), M( 9, 12), M( 9, 13), M( 9, 14), M( 9, 15), M( 9, 16), M( 9, 17), M( 9, 18), M( 9, 19), M( 9, 20), M( 9, 21), M( 9, 22), M( 9, 23), M( 9, 24), M( 9, 25), M( 9, 26), M( 9, 27), M( 9, 28), M( 9, 29), M( 9, 30), M( 9, 31),
62  M(10, 1), M(10, 2), M(10, 3), M(10, 4), M(10, 5), M(10, 6), M(10, 7), M(10, 8), M(10, 9), M(10, 10), M(10, 11), M(10, 12), M(10, 13), M(10, 14), M(10, 15), M(10, 16), M(10, 17), M(10, 18), M(10, 19), M(10, 20), M(10, 21), M(10, 22), M(10, 23), M(10, 24), M(10, 25), M(10, 26), M(10, 27), M(10, 28), M(10, 29), M(10, 30),
63  M(11, 1), M(11, 2), M(11, 3), M(11, 4), M(11, 5), M(11, 6), M(11, 7), M(11, 8), M(11, 9), M(11, 10), M(11, 11), M(11, 12), M(11, 13), M(11, 14), M(11, 15), M(11, 16), M(11, 17), M(11, 18), M(11, 19), M(11, 20), M(11, 21), M(11, 22), M(11, 23), M(11, 24), M(11, 25), M(11, 26), M(11, 27), M(11, 28), M(11, 29), M(11, 30), M(11, 31),
64 };
65 #undef M
66 
67 enum DaysTillMonth {
68  ACCUM_JAN = 0,
69  ACCUM_FEB = ACCUM_JAN + 31,
70  ACCUM_MAR = ACCUM_FEB + 29,
71  ACCUM_APR = ACCUM_MAR + 31,
72  ACCUM_MAY = ACCUM_APR + 30,
73  ACCUM_JUN = ACCUM_MAY + 31,
74  ACCUM_JUL = ACCUM_JUN + 30,
75  ACCUM_AUG = ACCUM_JUL + 31,
76  ACCUM_SEP = ACCUM_AUG + 31,
77  ACCUM_OCT = ACCUM_SEP + 30,
78  ACCUM_NOV = ACCUM_OCT + 31,
79  ACCUM_DEC = ACCUM_NOV + 30,
80 };
81 
83 static const uint16 _accum_days_for_month[] = {
84  ACCUM_JAN, ACCUM_FEB, ACCUM_MAR, ACCUM_APR,
85  ACCUM_MAY, ACCUM_JUN, ACCUM_JUL, ACCUM_AUG,
86  ACCUM_SEP, ACCUM_OCT, ACCUM_NOV, ACCUM_DEC,
87 };
88 
95 {
96  /* Year determination in multiple steps to account for leap
97  * years. First do the large steps, then the smaller ones.
98  */
99 
100  /* There are 97 leap years in 400 years */
101  Year yr = 400 * (date / (DAYS_IN_YEAR * 400 + 97));
102  int rem = date % (DAYS_IN_YEAR * 400 + 97);
103  uint16 x;
104 
105  if (rem >= DAYS_IN_YEAR * 100 + 25) {
106  /* There are 25 leap years in the first 100 years after
107  * every 400th year, as every 400th year is a leap year */
108  yr += 100;
109  rem -= DAYS_IN_YEAR * 100 + 25;
110 
111  /* There are 24 leap years in the next couple of 100 years */
112  yr += 100 * (rem / (DAYS_IN_YEAR * 100 + 24));
113  rem = (rem % (DAYS_IN_YEAR * 100 + 24));
114  }
115 
116  if (!IsLeapYear(yr) && rem >= DAYS_IN_YEAR * 4) {
117  /* The first 4 year of the century are not always a leap year */
118  yr += 4;
119  rem -= DAYS_IN_YEAR * 4;
120  }
121 
122  /* There is 1 leap year every 4 years */
123  yr += 4 * (rem / (DAYS_IN_YEAR * 4 + 1));
124  rem = rem % (DAYS_IN_YEAR * 4 + 1);
125 
126  /* The last (max 3) years to account for; the first one
127  * can be, but is not necessarily a leap year */
128  while (rem >= (IsLeapYear(yr) ? DAYS_IN_LEAP_YEAR : DAYS_IN_YEAR)) {
130  yr++;
131  }
132 
133  /* Skip the 29th of February in non-leap years */
134  if (!IsLeapYear(yr) && rem >= ACCUM_MAR - 1) rem++;
135 
136  ymd->year = yr;
137 
138  x = _month_date_from_year_day[rem];
139  ymd->month = x >> 5;
140  ymd->day = x & 0x1F;
141 }
142 
149 Date ConvertYMDToDate(Year year, Month month, Day day)
150 {
151  /* Day-offset in a leap year */
152  int days = _accum_days_for_month[month] + day - 1;
153 
154  /* Account for the missing of the 29th of February in non-leap years */
155  if (!IsLeapYear(year) && days >= ACCUM_MAR) days--;
156 
157  return DAYS_TILL(year) + days;
158 }
159 
162 extern void EnginesDailyLoop();
163 extern void DisasterDailyLoop();
164 extern void IndustryDailyLoop();
165 
166 extern void CompaniesMonthlyLoop();
167 extern void EnginesMonthlyLoop();
168 extern void TownsMonthlyLoop();
169 extern void IndustryMonthlyLoop();
170 extern void StationMonthlyLoop();
171 extern void SubsidyMonthlyLoop();
172 
173 extern void CompaniesYearlyLoop();
174 extern void VehiclesYearlyLoop();
175 extern void TownsYearlyLoop();
176 
177 extern void ShowEndGameChart();
178 
179 
181 static const Month _autosave_months[] = {
182  0,
183  1,
184  3,
185  6,
186  12,
187 };
188 
192 static void OnNewYear()
193 {
195  VehiclesYearlyLoop();
196  TownsYearlyLoop();
198 #ifdef ENABLE_NETWORK
200 #endif /* ENABLE_NETWORK */
201 
203 
204  /* check if we reached end of the game */
205  if (_cur_year == ORIGINAL_END_YEAR) {
207  /* check if we reached the maximum year, decrement dates by a year */
208  } else if (_cur_year == MAX_YEAR + 1) {
209  Vehicle *v;
210  int days_this_year;
211 
212  _cur_year--;
213  days_this_year = IsLeapYear(_cur_year) ? DAYS_IN_LEAP_YEAR : DAYS_IN_YEAR;
214  _date -= days_this_year;
215  FOR_ALL_VEHICLES(v) v->date_of_last_service -= days_this_year;
216 
217  LinkGraph *lg;
218  FOR_ALL_LINK_GRAPHS(lg) lg->ShiftDates(-days_this_year);
219 
220 #ifdef ENABLE_NETWORK
221  /* Because the _date wraps here, and text-messages expire by game-days, we have to clean out
222  * all of them if the date is set back, else those messages will hang for ever */
224 #endif /* ENABLE_NETWORK */
225  }
226 
228 }
229 
233 static void OnNewMonth()
234 {
236  _do_autosave = true;
238  }
239 
243  TownsMonthlyLoop();
244  IndustryMonthlyLoop();
247 #ifdef ENABLE_NETWORK
249 #endif /* ENABLE_NETWORK */
250 }
251 
255 static void OnNewDay()
256 {
257 #ifdef ENABLE_NETWORK
259 #endif /* ENABLE_NETWORK */
260 
261  DisasterDailyLoop();
263 
266 
267  /* Refresh after possible snowline change */
269 }
270 
276 {
277  /* increase day, and check if a new day is there? */
278  _tick_counter++;
279 
280  if (_game_mode == GM_MENU) return;
281 
282  _date_fract++;
283  if (_date_fract < DAY_TICKS) return;
284  _date_fract = 0;
285 
286  /* increase day counter */
287  _date++;
288 
289  YearMonthDay ymd;
290  ConvertDateToYMD(_date, &ymd);
291 
292  /* check if we entered a new month? */
293  bool new_month = ymd.month != _cur_month;
294 
295  /* check if we entered a new year? */
296  bool new_year = ymd.year != _cur_year;
297 
298  /* update internal variables before calling the daily/monthly/yearly loops */
299  _cur_month = ymd.month;
300  _cur_year = ymd.year;
301 
302  /* yes, call various daily loops */
303  OnNewDay();
304 
305  /* yes, call various monthly loops */
306  if (new_month) OnNewMonth();
307 
308  /* yes, call various yearly loops */
309  if (new_year) OnNewYear();
310 }