GeoSphere.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 _GEOSPHERE_H
#define _GEOSPHERE_H
 
#include <SDL_stdinc.h>
 
#include "BaseSphere.h"
#include "Camera.h"
#include "vector3.h"
 
#include <deque>
 
namespace Graphics {
    class Renderer;
    class Texture;
}
 
class SystemBody;
class GeoPatch;
class GeoPatchContext;
class SQuadSplitRequest;
class SQuadSplitResult;
class SSingleSplitResult;
 
#define NUM_PATCHES 6
 
class GeoSphere : public BaseSphere {
public:
    GeoSphere(const SystemBody *body);
    virtual ~GeoSphere();
 
    virtual void Update() override;
    virtual void Render(Graphics::Renderer *renderer, const matrix4x4d &modelView, vector3d campos, const float radius, const std::vector<Camera::Shadow> &shadows) override;
 
    virtual double GetHeight(const vector3d &p) const override final
    {
        const double h = m_terrain->GetHeight(p);
#ifdef DEBUG
        // XXX don't remove this. Fix your fractals instead
        // Fractals absolutely MUST return heights >= 0.0 (one planet radius)
        // otherwise atmosphere and other things break.
        if (h < 0.0) {
            Output("GetHeight({ %f, %f, %f }) returned %f\n", p.x, p.y, p.z, h);
            m_terrain->DebugDump();
            assert(h >= 0.0);
        }
#endif /* DEBUG */
        return h;
    }
 
    static void Init();
    static void Uninit();
    static void UpdateAllGeoSpheres();
    static void OnChangeDetailLevel();
    static bool OnAddQuadSplitResult(const SystemPath &path, SQuadSplitResult *res);
    static bool OnAddSingleSplitResult(const SystemPath &path, SSingleSplitResult *res);
    // in sbody radii
    virtual double GetMaxFeatureHeight() const override final { return m_terrain->GetMaxHeight(); }
 
    bool AddQuadSplitResult(SQuadSplitResult *res);
    bool AddSingleSplitResult(SSingleSplitResult *res);
    void ProcessSplitResults();
 
    virtual void Reset() override;
 
    inline Sint32 GetMaxDepth() const { return m_maxDepth; }
 
    void AddQuadSplitRequest(double, SQuadSplitRequest *, GeoPatch *);
 
private:
    void BuildFirstPatches();
    void CalculateMaxPatchDepth();
    inline vector3d GetColor(const vector3d &p, double height, const vector3d &norm) const
    {
        return m_terrain->GetColor(p, height, norm);
    }
    void ProcessQuadSplitRequests();
 
    std::unique_ptr<GeoPatch> m_patches[6];
    struct TDistanceRequest {
        TDistanceRequest(double dist, SQuadSplitRequest *pRequest, GeoPatch *pRequester) :
            mDistance(dist),
            mpRequest(pRequest),
            mpRequester(pRequester) {}
        double mDistance;
        SQuadSplitRequest *mpRequest;
        GeoPatch *mpRequester;
    };
    std::deque<TDistanceRequest> mQuadSplitRequests;
 
    static const uint32_t MAX_SPLIT_OPERATIONS = 128;
    std::deque<SQuadSplitResult *> mQuadSplitResults;
    std::deque<SSingleSplitResult *> mSingleSplitResults;
 
    bool m_hasTempCampos;
    vector3d m_tempCampos;
    Graphics::Frustum m_tempFrustum;
 
    static RefCountedPtr<GeoPatchContext> s_patchContext;
 
    virtual void SetUpMaterials() override;
 
    RefCountedPtr<Graphics::Texture> m_texHi;
    RefCountedPtr<Graphics::Texture> m_texLo;
 
    enum EGSInitialisationStage {
        eBuildFirstPatches = 0,
        eRequestedFirstPatches,
        eReceivedFirstPatches,
        eDefaultUpdateState
    };
    EGSInitialisationStage m_initStage;
 
    Sint32 m_maxDepth;
};
 
#endif /* _GEOSPHERE_H */