GeomTree.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 _GEOMTREE_H
#define _GEOMTREE_H
 
#include "libs.h"
 
namespace Serializer {
    class Reader;
    class Writer;
} // namespace Serializer
 
struct isect_t {
    // triIdx = -1 if no intersection
    int triIdx;
    float dist;
};
 
class BVHTree;
struct BVHNode;
 
class GeomTree {
public:
    GeomTree(const int numVerts, const int numTris, const std::vector<vector3f> &vertices, const std::vector<Uint32> indices, const std::vector<Uint32> triFlags);
    GeomTree(Serializer::Reader &rd);
    void Save(Serializer::Writer &wr) const;
 
    ~GeomTree();
 
    const Aabb &GetAabb() const { return m_aabb; }
    // dir should be unit length,
    // isect.dist should be ray length
    // isect.triIdx should be -1 unless repeat calls with same isect_t
    void TraceRay(const vector3f &start, const vector3f &dir, isect_t *isect) const;
    void TraceRay(const BVHNode *startNode, const vector3f &a_origin, const vector3f &a_dir, isect_t *isect) const;
    vector3f GetTriNormal(int triIdx) const;
    Uint32 GetTriFlag(int triIdx) const { return m_triFlags[triIdx]; }
    double GetRadius() const { return m_radius; }
 
#pragma pack(4)
    struct Edge {
        int v1i, v2i;
        float len;
        vector3f dir;
        // edge triFlag can be weird since edges may get merged and
        // intended flag lost
        int triFlag;
    };
#pragma pack()
 
    const Edge *GetEdges() const
    {
        return &m_edges[0];
    }
    int GetNumEdges() const { return m_numEdges; }
 
    BVHTree *GetTriTree() const { return m_triTree.get(); }
    BVHTree *GetEdgeTree() const { return m_edgeTree.get(); }
 
    const std::vector<vector3f> &GetVertices() const { return m_vertices; }
    const Uint32 *GetIndices() const { return &m_indices[0]; }
    const Uint32 *GetTriFlags() const { return &m_triFlags[0]; }
    int GetNumVertices() const { return m_numVertices; }
    int GetNumTris() const { return m_numTris; }
 
private:
    void RayTriIntersect(int numRays, const vector3f &origin, const vector3f *dirs, int triIdx, isect_t *isects) const;
 
    int m_numVertices;
    int m_numEdges;
    int m_numTris;
 
    double m_radius;
    Aabb m_aabb;
    std::vector<Aabb> m_aabbs;
 
    std::unique_ptr<BVHTree> m_triTree;
    std::unique_ptr<BVHTree> m_edgeTree;
 
    std::vector<Edge> m_edges;
 
    std::vector<vector3f> m_vertices;
    std::vector<Uint32> m_indices;
    std::vector<Uint32> m_triFlags;
};
 
#endif /* _GEOMTREE_H */