CelestialBody.hpp

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#pragma once
 
#include "core/helpers.hpp"
#include "core/node.hpp"
 
#include <glm/mat4x4.hpp>
#include <glm/vec3.hpp>
 
struct SpinConfiguration
{
    float axial_tilt{0.0f}; 
    float speed{0.0f};      
};
 
struct OrbitConfiguration
{
    float radius{0.0f};      
    float inclination{0.0f}; 
    float speed{0.0f};       
};
 
class CelestialBody
{
public:
    CelestialBody(bonobo::mesh_data const& shape, GLuint const* program,
                  GLuint diffuse_texture_id);
 
    glm::mat4 render(std::chrono::microseconds elapsed_time,
                     glm::mat4 const& view_projection,
                     glm::mat4 const& parent_transform = glm::mat4(1.0f),
                     bool show_basis = false);
 
    void add_child(CelestialBody* child);
 
    std::vector<CelestialBody*> const& get_children() const;
 
    void set_orbit(OrbitConfiguration const& configuration);
 
    void set_scale(glm::vec3 const& scale);
 
    void set_spin(SpinConfiguration const& configuration);
 
    void set_ring(bonobo::mesh_data const& shape, GLuint const* program,
                  GLuint diffuse_texture_id,
                  glm::vec2 const& scale = glm::vec2(1.0f));
 
private:
    struct {
        Node node;
        struct {
            float radius{0.0f};         
            float inclination{0.0f};    
            float speed{0.0f};          
            float rotation_angle{0.0f}; 
        } orbit;
        glm::vec3 scale{1.0f};
        struct {
            float axial_tilt{0.0f};     
            float speed{0.0f};          
            float rotation_angle{0.0f}; 
        } spin;
    } _body;
 
    struct {
        Node node;
        glm::vec2 scale{1.0f};
        bool is_set{false};
    } _ring;
 
    std::vector<CelestialBody*> _children;
};