GeoPatch.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 _GEOPATCH_H
#define _GEOPATCH_H
 
#include <SDL_stdinc.h>
 
#include "Color.h"
#include "GeoPatchID.h"
#include "JobQueue.h"
#include "RefCounted.h"
#include "matrix4x4.h"
#include "vector3.h"
#include <deque>
#include <memory>
 
//#define DEBUG_BOUNDING_SPHERES
 
#ifdef DEBUG_BOUNDING_SPHERES
#include "graphics/Drawables.h"
namespace Graphics {
    class RenderState;
}
#endif
 
namespace Graphics {
    class Renderer;
    class Frustum;
    class VertexBuffer;
}
 
class GeoPatchContext;
class GeoSphere;
class BasePatchJob;
class SQuadSplitResult;
class SSingleSplitResult;
 
class GeoPatch {
public:
    GeoPatch(const RefCountedPtr<GeoPatchContext> &_ctx, GeoSphere *gs,
        const vector3d &v0_, const vector3d &v1_, const vector3d &v2_, const vector3d &v3_,
        const int depth, const GeoPatchID &ID_);
 
    ~GeoPatch();
 
    inline void NeedToUpdateVBOs()
    {
        m_needUpdateVBOs = (nullptr != m_heights);
    }
 
    void UpdateVBOs(Graphics::Renderer *renderer);
 
    int GetChildIdx(const GeoPatch *child) const
    {
        for (int i = 0; i < NUM_KIDS; i++) {
            if (m_kids[i].get() == child) return i;
        }
        abort();
        return -1;
    }
 
    // in patch surface coords, [0,1]
    inline vector3d GetSpherePoint(const double x, const double y) const
    {
        return (m_v0 + x * (1.0 - y) * (m_v1 - m_v0) + x * y * (m_v2 - m_v0) + (1.0 - x) * y * (m_v3 - m_v0)).Normalized();
    }
 
    void Render(Graphics::Renderer *r, const vector3d &campos, const matrix4x4d &modelView, const Graphics::Frustum &frustum);
 
    inline bool canBeMerged() const
    {
        bool merge = true;
        if (m_kids[0]) {
            for (int i = 0; i < NUM_KIDS; i++) {
                merge &= m_kids[i]->canBeMerged();
            }
        }
        merge &= !(m_HasJobRequest);
        return merge;
    }
 
    void LODUpdate(const vector3d &campos, const Graphics::Frustum &frustum);
 
    void RequestSinglePatch();
    void ReceiveHeightmaps(SQuadSplitResult *psr);
    void ReceiveHeightmap(const SSingleSplitResult *psr);
    void ReceiveJobHandle(Job::Handle job);
 
    inline bool HasHeightData() const { return (m_heights.get() != nullptr); }
private:
    static const int NUM_KIDS = 4;
 
    RefCountedPtr<GeoPatchContext> m_ctx;
    const vector3d m_v0, m_v1, m_v2, m_v3;
    std::unique_ptr<double[]> m_heights;
    std::unique_ptr<vector3f[]> m_normals;
    std::unique_ptr<Color3ub[]> m_colors;
    std::unique_ptr<Graphics::VertexBuffer> m_vertexBuffer;
    std::unique_ptr<GeoPatch> m_kids[NUM_KIDS];
    GeoPatch *m_parent;
    GeoSphere *m_geosphere;
    double m_roughLength;
    vector3d m_clipCentroid, m_centroid;
    double m_clipRadius;
    Sint32 m_depth;
    bool m_needUpdateVBOs;
 
    const GeoPatchID m_PatchID;
    Job::Handle m_job;
    bool m_HasJobRequest;
#ifdef DEBUG_BOUNDING_SPHERES
    std::unique_ptr<Graphics::Drawables::Sphere3D> m_boundsphere;
#endif
};
 
#endif /* _GEOPATCH_H */