CityOnPlanet.h

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// Copyright © 2008-2023 Pioneer Developers. See AUTHORS.txt for details
// Licensed under the terms of the GPL v3. See licenses/GPL-3.txt
 
#ifndef _CITYONPLANET_H
#define _CITYONPLANET_H
 
#include "CollMesh.h"
#include "FrameId.h"
#include "Random.h"
#include "JsonFwd.h"
 
#include <set>
 
class Geom;
class Planet;
class SpaceStation;
class Frame;
class SystemPath;
class SystemBody;
 
namespace Graphics {
    class Renderer;
    class Frustum;
    class Material;
} // namespace Graphics
 
namespace FileSystem {
    struct FileInfo;
} // namespace FileSystem
 
namespace SceneGraph {
    class Model;
    class Animation;
} // namespace SceneGraph
 
class CityOnPlanet {
public:
    CityOnPlanet() = delete;
    CityOnPlanet(Planet *planet, SpaceStation *station, const Uint32 seed);
    virtual ~CityOnPlanet();
 
    void Render(Graphics::Renderer *r, const Graphics::Frustum &camera, const SpaceStation *station, const vector3d &viewCoords, const matrix4x4d &viewTransform);
    inline Planet *GetPlanet() const { return m_planet; }
    float GetClipRadius() const { return m_clipRadius; }
 
    static void Init();
    static void Uninit();
 
    static void SetCityModelPatterns(const SystemPath &path);
 
    static constexpr double RADIUS = 5000.0;
    // size of a city grid cell
    static constexpr uint32_t CELLSIZE = 50;
    // maximum number of cells a single building may take up
    static constexpr uint32_t CELLMAX = 32;
    static constexpr uint32_t CELLMASK = CELLMAX - 1;
 
private:
 
    // Defines which "city sector" a building should optimally be placed in
    enum class SectorKind : uint32_t {
        None,       // no specific sector for a building
        Storage,    // warehouses and personal storage buildings
        Industry,   // industrial buildings with high pollution or power draw
        Monument,   // civic / recreational buildings
        Habitat,    // living spaces and office buildings
        Frontier,   // general buildings scattered at the edge of the city
    };
 
    // Building type definition
    struct BuildingType {
        uint8_t cellSize[2] = {1, 1};
 
        float rarityAirless = 0;
        float rarityAtmo = 0;
 
        SectorKind buildingKind = SectorKind::None;
 
        SceneGraph::Model *model;
        SceneGraph::Animation *idleAnimation;
    };
 
    struct CityRadiusDef {
        double population = 0.0;    // billions of people
        float baseSize = 0.0;       // base size of the city (meters)
        float atmoSize = 0.0;       // additional size from atmosphere (meters)
        float randomSize = 0.0;     // random additional size (meters)
        float density = 0.0;        // density of buildings within the city
    };
 
    struct CityFlavourType {
        std::string flavourName;
        std::vector<CityRadiusDef> sizeDefs;
        std::vector<BuildingType> buildingTypes;
    };
 
private:
 
    void Generate(SpaceStation *station);
    void CalcCityRadius(const SystemBody *body);
 
    void SetGridOccupancy(uint32_t x, uint32_t y, const uint8_t size[2]);
    bool TestGridOccupancy(uint32_t x, uint32_t y, const uint8_t size[2]);
 
    // Quickly check if the given single grid cell is set.
    // It is expected as a precondition that the position is valid and within
    // the extents of the grid.
    inline bool TestGridQuick(uint32_t x, uint32_t y) const
    {
        // bitset is stored in lsb order with 8 cells per byte
        return m_gridBitset[y * m_gridPitch + x / 8] & (1 << (x & 7));
    }
 
    void AddStaticGeomsToCollisionSpace();
    void RemoveStaticGeomsFromCollisionSpace();
 
    struct BuildingInstance {
        Uint32 instIndex;
        float clipRadius;
        int rotation; // 0-3
        vector3d pos;
        Geom *geom;
    };
 
    const SystemBody *m_body;
    Planet *m_planet;
 
    double m_cityRadius;
    double m_cityDensity;
    uint32_t m_citySize;
 
    FrameId m_frame;
    Random m_rand;
 
    std::vector<BuildingInstance> m_buildings;
    std::vector<BuildingInstance> m_enabledBuildings;
    std::vector<Uint32> m_buildingCounts;
 
    // bitmask occupancy grid for quick population of the city
    std::unique_ptr<uint8_t[]> m_gridBitset;
    // width of a single grid row in bytes
    uint32_t m_gridPitch;
    uint32_t m_gridLen;
 
    int m_detailLevel;
    float m_clipRadius;
    vector3d m_realCentre;
    vector3d m_gridOrigin;
 
    CityFlavourType *m_cityType;
 
    // --------------------------------------------------------
    // statics
private:
 
    static std::vector<CityFlavourType> s_cityFlavours;
 
    static std::unique_ptr<Graphics::Material> s_debugMat;
 
    static void LoadCityFlavour(const FileSystem::FileInfo &file);
    static void LoadBuildingType(std::string_view key, const Json &buildingDef, BuildingType &out);
    static void GetModelSize(const Aabb &aabb, uint8_t size[2]);
};
 
#endif /* _CITYONPLANET_H */