/* SPDX-License-Identifier: GPL-2.0-or-later
 * Copyright 2009 by Janne Karhu. All rights reserved. */

#pragma once

/** \file
 * \ingroup bke
 */

#ifdef __cplusplus
extern "C" {
#endif

struct BoidSettings;
struct BoidState;
struct Object;
struct ParticleData;
struct ParticleSettings;
struct ParticleSimulationData;
struct RNG;

typedef struct BoidBrainData {
  struct ParticleSimulationData *sim;
  struct ParticleSettings *part;
  float timestep, cfra, dfra;
  float wanted_co[3], wanted_speed;

  /* Goal stuff */
  struct Object *goal_ob;
  float goal_co[3];
  float goal_nor[3];
  float goal_priority;

  struct RNG *rng;
} BoidBrainData;

void boids_precalc_rules(struct ParticleSettings *part, float cfra);
/**
 * Determines the velocity the boid wants to have.
 */
void boid_brain(BoidBrainData *bbd, int p, struct ParticleData *pa);
/**
 * Tries to realize the wanted velocity taking all constraints into account.
 */
void boid_body(BoidBrainData *bbd, struct ParticleData *pa);
void boid_default_settings(struct BoidSettings *boids);
struct BoidRule *boid_new_rule(int type);
struct BoidState *boid_new_state(struct BoidSettings *boids);
struct BoidState *boid_duplicate_state(struct BoidSettings *boids, struct BoidState *state);
void boid_free_settings(struct BoidSettings *boids);
struct BoidSettings *boid_copy_settings(const struct BoidSettings *boids);
struct BoidState *boid_get_current_state(struct BoidSettings *boids);

#ifdef __cplusplus
}
#endif