environment.h

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// Luanti
// SPDX-License-Identifier: LGPL-2.1-or-later
// Copyright (C) 2010-2013 celeron55, Perttu Ahola <celeron55@gmail.com>
 
#pragma once
 
/*
        This class is the game's environment.
        It contains:
        - The map
        - Players
        - Other objects
        - The current time in the game
        - etc.
*/
 
#include <atomic>
#include <mutex>
#include <optional>
#include <vector>
#include "irr_v3d.h"
#include "util/basic_macros.h"
#include "line3d.h"
 
class IGameDef;
class Map;
struct PointedThing;
class RaycastState;
struct Pointabilities;
 
class Environment
{
public:
        // Environment will delete the map passed to the constructor
        Environment(IGameDef *gamedef);
        virtual ~Environment() = default;
        DISABLE_CLASS_COPY(Environment);
 
        /*
                Step everything in environment.
                - Move players
                - Step mobs
                - Run timers of map
        */
        virtual void step(f32 dtime) = 0;
 
        virtual Map &getMap() = 0;
 
        u32 getDayNightRatio();
 
        // 0-23999
        virtual void setTimeOfDay(u32 time);
        u32 getTimeOfDay();
        float getTimeOfDayF();
 
        void stepTimeOfDay(float dtime);
 
        void setTimeOfDaySpeed(float speed);
 
        void setDayNightRatioOverride(bool enable, u32 value);
 
        u32 getDayCount();

        bool line_of_sight(v3f pos1, v3f pos2, v3s16 *p = nullptr);

        virtual void getSelectedActiveObjects(const core::line3d<f32> &shootline_on_map,
                        std::vector<PointedThing> &objects,
                        const std::optional<Pointabilities> &pointabilities) = 0;

        void continueRaycast(RaycastState *state, PointedThing *result);
 
        // counter used internally when triggering ABMs
        u32 m_added_objects;
 
        IGameDef *getGameDef() { return m_gamedef; }
 
protected:
        std::atomic<float> m_time_of_day_speed;
 
        /*
         * Below: values managed by m_time_lock
         */
        // Time of day in milli-hours (0-23999), determines day and night
        u32 m_time_of_day;
        // Time of day in 0...1
        float m_time_of_day_f;
        // Stores the skew created by the float -> u32 conversion
        // to be applied at next conversion, so that there is no real skew.
        float m_time_conversion_skew = 0.0f;
        // Overriding the day-night ratio is useful for custom sky visuals
        bool m_enable_day_night_ratio_override = false;
        u32 m_day_night_ratio_override = 0.0f;
        // Days from the server start, accounts for time shift
        // in game (e.g. /time or bed usage)
        std::atomic<u32> m_day_count;
        /*
         * Above: values managed by m_time_lock
         */
 
        IGameDef *m_gamedef;
 
private:
        std::mutex m_time_lock;
};