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#ifndef NBODY_H

#define NBODY_H


#include "nbody_types.h"

#include "sphere_types.h" /* Apporte la définition de SphereInstance */


/* --- Initialisation --- */

void nbody_init_preset(NBodySim* sim);


/* --- Boucle Principale (Run) --- */

void nbody_step(NBodySim* sim, float delta_time);


void nbody_update_time_scale(NBodySim* sim, float delta_time);


/* --- Rendu --- */

void nbody_write_instances(const NBodySim* sim, SphereInstance* out);


int nbody_get_count(const NBodySim* sim);


/* --- Diagnostiques / Debug --- */

float nbody_total_energy(const NBodySim* sim);


float nbody_kinetic_energy(const NBodySim* sim);


float nbody_energy_drift(const NBodySim* sim);


float nbody_energy_drift_signed(const NBodySim* sim);


#endif /* NBODY_H */

nbody_get_count
int nbody_get_count(const NBodySim *sim)
Returns the number of active bodies.

nbody_init_preset
void nbody_init_preset(NBodySim *sim)
Initializes the simulation with a preset solar system configuration.

nbody_energy_drift_signed
float nbody_energy_drift_signed(const NBodySim *sim)
Signed energy drift.

nbody_step
void nbody_step(NBodySim *sim, float delta_time)
Advances the simulation by the given wall-clock delta time.

nbody_total_energy
float nbody_total_energy(const NBodySim *sim)
Computes the total energy (kinetic + gravitational potential).

nbody_energy_drift
float nbody_energy_drift(const NBodySim *sim)
Returns the relative energy drift |E(t) - E₀| / |E₀|.

nbody_write_instances
void nbody_write_instances(const NBodySim *sim, SphereInstance *out)
Writes current body positions and materials into a SphereInstance array.

nbody_update_time_scale
void nbody_update_time_scale(NBodySim *sim, float delta_time)
Smoothly transitions time_scale toward target_time_scale.

nbody_kinetic_energy
float nbody_kinetic_energy(const NBodySim *sim)
Computes kinetic energy only: Σ ½ m v².

nbody_types.h

sphere_types.h
Pure-data type for per-instance sphere attributes.

NBodySim
State container for the N-body simulation.
Definition nbody_types.h:68

SphereInstance
Per-instance data sent to the shader via an instanced VBO.
Definition sphere_types.h:25