OpenTTD/src/timer/timer_game_tick.h

60 lines
2.7 KiB
C++

/*
* This file is part of OpenTTD.
* 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.
* 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.
* 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/>.
*/
/** @file timer_game_tick.h Definition of the tick-based game-timer */
#ifndef TIMER_GAME_TICK_H
#define TIMER_GAME_TICK_H
#include "gfx_type.h"
#include <chrono>
/**
* Timer that represents the game-ticks. It will pause when the game is paused.
*
* @note Callbacks are executed in the game-thread.
*/
class TimerGameTick {
public:
using Ticks = int32_t; ///< The type to store ticks in
using TPeriod = uint;
using TElapsed = uint;
struct TStorage {
uint elapsed;
};
static uint64_t counter; ///< Monotonic counter, in ticks, since start of game.
};
/**
* Storage class for Ticks constants.
*/
class Ticks {
public:
static constexpr TimerGameTick::Ticks INVALID_TICKS = -1; ///< Representation of an invalid number of ticks.
/**
* 1 day is 74 ticks; TimerGameCalendar::date_fract used to be uint16_t and incremented by 885. On an overflow the new day begun and 65535 / 885 = 74.
* 1 tick is approximately 27 ms.
* 1 day is thus about 2 seconds (74 * 27 = 1998) on a machine that can run OpenTTD normally
*/
static constexpr TimerGameTick::Ticks DAY_TICKS = 74; ///< ticks per day
static constexpr TimerGameTick::Ticks TICKS_PER_SECOND = 1000 / MILLISECONDS_PER_TICK; ///< Estimation of how many ticks fit in a single second.
static constexpr TimerGameTick::Ticks STATION_RATING_TICKS = 185; ///< Cycle duration for updating station rating.
static constexpr TimerGameTick::Ticks STATION_ACCEPTANCE_TICKS = 250; ///< Cycle duration for updating station acceptance.
static constexpr TimerGameTick::Ticks STATION_LINKGRAPH_TICKS = 504; ///< Cycle duration for cleaning dead links.
static constexpr TimerGameTick::Ticks CARGO_AGING_TICKS = 185; ///< Cycle duration for aging cargo.
static constexpr TimerGameTick::Ticks INDUSTRY_PRODUCE_TICKS = 256; ///< Cycle duration for industry production.
static constexpr TimerGameTick::Ticks TOWN_GROWTH_TICKS = 70; ///< Cycle duration for towns trying to grow (this originates from the size of the town array in TTD).
static constexpr TimerGameTick::Ticks INDUSTRY_CUT_TREE_TICKS = INDUSTRY_PRODUCE_TICKS * 2; ///< Cycle duration for lumber mill's extra action.
};
#endif /* TIMER_GAME_TICK_H */