Game.h

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// Copyright © 2008-2021 Pioneer Developers. See AUTHORS.txt for details
// Licensed under the terms of the GPL v3. See licenses/GPL-3.txt
 
#ifndef _GAME_H
#define _GAME_H
 
#include "JsonFwd.h"
#include "galaxy/Galaxy.h"
#include "galaxy/SystemPath.h"
#include "gameconsts.h"
#include <string>
 
class GameLog;
class HyperspaceCloud;
class Player;
class Space;
 
namespace Graphics {
    class Renderer;
}
 
struct CannotSaveCurrentGameState {};
struct CannotSaveInHyperspace : public CannotSaveCurrentGameState {};
struct CannotSaveDeadPlayer : public CannotSaveCurrentGameState {};
struct InvalidGameStartLocation {
    std::string error;
    InvalidGameStartLocation(const std::string &error_) :
        error(error_) {}
};
 
class View;
class SectorView;
class SystemInfoView;
class SystemView;
class WorldView;
class DeathView;
class ObjectViewerView;
 
class Game {
public:
    static Json LoadGameToJson(const std::string &filename);
    // LoadGame and SaveGame throw exceptions on failure
    static Game *LoadGame(const std::string &filename);
    static bool CanLoadGame(const std::string &filename);
    // XXX game arg should be const, and this should probably be a member function
    // (or LoadGame/SaveGame should be somewhere else entirely)
    static void SaveGame(const std::string &filename, Game *game);
 
    // start docked in station referenced by path or nearby to body if it is no station
    Game(const SystemPath &path, const double startDateTime = 0.0);
 
    // load game
    Game(const Json &jsonObj);
 
    ~Game();
 
    // save game
    void ToJson(Json &jsonObj);
 
    // various game states
    bool IsNormalSpace() const { return m_state == State::NORMAL; }
    bool IsHyperspace() const { return m_state == State::HYPERSPACE; }
 
    RefCountedPtr<Galaxy> GetGalaxy() const { return m_galaxy; }
    Space *GetSpace() const { return m_space.get(); }
    double GetTime() const { return m_time; }
    Player *GetPlayer() const { return m_player.get(); }
 
    // physics step
    void TimeStep(float step);
 
    // update time acceleration once per render frame
    // returns true if timeaccel was changed
    bool UpdateTimeAccel();
 
    // request switch to hyperspace
    void WantHyperspace();
 
    // hyperspace parameters. only meaningful when IsHyperspace() is true
    float GetHyperspaceProgress() const { return m_hyperspaceProgress; }
    double GetHyperspaceDuration() const { return m_hyperspaceDuration; }
    double GetHyperspaceEndTime() const { return m_hyperspaceEndTime; }
    double GetHyperspaceArrivalProbability() const;
    const SystemPath &GetHyperspaceDest() const { return m_hyperspaceDest; }
    const SystemPath &GetHyperspaceSource() const { return m_hyperspaceSource; }
    void RemoveHyperspaceCloud(HyperspaceCloud *);
 
    enum TimeAccel {
        TIMEACCEL_PAUSED,
        TIMEACCEL_1X,
        TIMEACCEL_10X,
        TIMEACCEL_100X,
        TIMEACCEL_1000X,
        TIMEACCEL_10000X,
        TIMEACCEL_HYPERSPACE
    };
 
    void SetTimeAccel(TimeAccel t);
    void RequestTimeAccel(TimeAccel t, bool force = false);
 
    void RequestTimeAccelInc(bool force = false);
    void RequestTimeAccelDec(bool force = false);
 
    TimeAccel GetTimeAccel() const { return m_timeAccel; }
    TimeAccel GetRequestedTimeAccel() const { return m_requestedTimeAccel; }
    bool IsPaused() const { return m_timeAccel == TIMEACCEL_PAUSED; }
 
    float GetTimeAccelRate() const { return s_timeAccelRates[m_timeAccel]; }
    float GetInvTimeAccelRate() const { return s_timeInvAccelRates[m_timeAccel]; }
 
    float GetTimeStep() const { return s_timeAccelRates[m_timeAccel] * (1.0f / PHYSICS_HZ); }
 
    SectorView *GetSectorView() const { return m_gameViews->m_sectorView; }
    SystemInfoView *GetSystemInfoView() const { return m_gameViews->m_systemInfoView; }
    SystemView *GetSystemView() const { return m_gameViews->m_systemView; }
    WorldView *GetWorldView() const { return m_gameViews->m_worldView; }
    DeathView *GetDeathView() const { return m_gameViews->m_deathView; }
    View *GetSpaceStationView() const { return m_gameViews->m_spaceStationView; }
    View *GetInfoView() const { return m_gameViews->m_infoView; }
 
    /* Only use #if WITH_OBJECTVIEWER */
    ObjectViewerView *GetObjectViewerView() const;
 
    GameLog *log;
 
private:
    class Views {
    public:
        Views();
        void Init(Game *game);
        void LoadFromJson(const Json &jsonObj, Game *game);
        ~Views();
 
        void SetRenderer(Graphics::Renderer *r);
 
        SectorView *m_sectorView;
        SystemInfoView *m_systemInfoView;
        SystemView *m_systemView;
        WorldView *m_worldView;
        DeathView *m_deathView;
        View *m_spaceStationView;
        View *m_infoView;
 
        /* Only use #if WITH_OBJECTVIEWER */
        ObjectViewerView *m_objectViewerView;
    };
 
    void CreateViews();
    void LoadViewsFromJson(const Json &jsonObj);
    void DestroyViews();
 
    static void EmitPauseState(bool paused);
 
    void SwitchToHyperspace();
    void SwitchToNormalSpace();
 
    RefCountedPtr<Galaxy> m_galaxy;
    std::unique_ptr<Views> m_gameViews;
    std::unique_ptr<Space> m_space;
    double m_time;
 
    std::unique_ptr<Player> m_player;
 
    enum class State {
        NORMAL,
        HYPERSPACE,
    };
    State m_state;
 
    bool m_wantHyperspace;
 
    std::list<HyperspaceCloud *> m_hyperspaceClouds;
    SystemPath m_hyperspaceSource;
    SystemPath m_hyperspaceDest;
    double m_hyperspaceProgress;
    double m_hyperspaceDuration;
    double m_hyperspaceEndTime;
 
    TimeAccel m_timeAccel;
    TimeAccel m_requestedTimeAccel;
    bool m_forceTimeAccel;
    static const float s_timeAccelRates[];
    static const float s_timeInvAccelRates[];
};
 
#endif