lod.hpp

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#pragma once
 
#include "lmgl/scene/mesh.hpp"
 
#include <glm/glm.hpp>
 
#include <memory>
#include <vector>
 
namespace lmgl {
 
namespace scene {

struct LODLevel {
    std::shared_ptr<Mesh> mesh;

    float max_distance_sq;

    LODLevel(std::shared_ptr<Mesh> m, float distance) : mesh(m), max_distance_sq(distance * distance) {}
};

class LOD {
  public:
    LOD() = default;

    ~LOD() = default;

    void add_level(std::shared_ptr<Mesh> mesh, float max_distance);

    std::shared_ptr<Mesh> get_mesh(float distance_sq) const;

    std::shared_ptr<Mesh> get_mesh(const glm::vec3 &camera_pos, const glm::vec3 &object_pos) const;

    inline size_t get_level_count() const { return m_levels.size(); }

    inline const LODLevel &get_level(size_t index) const { return m_levels[index]; }

    inline bool has_levels() const { return !m_levels.empty(); }

    inline void clear() { m_levels.clear(); }
 
  private:

    std::vector<LODLevel> m_levels;
};
 
} // namespace scene
 
} // namespace lmgl