BKE_effect.h

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/* SPDX-FileCopyrightText: 2001-2002 NaN Holding BV. All rights reserved.
 *
 * SPDX-License-Identifier: GPL-2.0-or-later */
#pragma once

 
struct Collection;
struct Depsgraph;
struct ListBase;
struct RNG;
struct Object;
struct ParticleData;
struct ParticleKey;
struct ParticleSimulationData;
struct Scene;
struct ViewLayer;
 
struct EffectorWeights *BKE_effector_add_weights(struct Collection *collection);
 
/* Input to effector code */
typedef struct EffectedPoint {
  float *loc;
  float *vel;
  float *ave; /* angular velocity for particles with dynamic rotation */
  float *rot; /* rotation quaternion for particles with dynamic rotation */
  float vel_to_frame;
  float vel_to_sec;
 
  /* only for particles */
  float size, charge;
 
  unsigned int flag;
  int index;
 
  struct ParticleSystem *psys; /* particle system the point belongs to */
} EffectedPoint;
 
typedef struct GuideEffectorData {
  float vec_to_point[3];
  float strength;
} GuideEffectorData;
 
typedef struct EffectorData {
  /* Effector point */
  float loc[3];
  float nor[3];
  float vel[3];
 
  float vec_to_point[3];
  float distance, falloff;
 
  /* only for effector particles */
  float size, charge;
 
  /* only for vortex effector with surface falloff */
  float nor2[3], vec_to_point2[3];
 
  int *index; /* point index */
} EffectorData;
 
/* used for calculating the effector force */
typedef struct EffectorCache {
  struct EffectorCache *next, *prev;
 
  struct Depsgraph *depsgraph;
  struct Scene *scene;
  struct Object *ob;
  struct ParticleSystem *psys;
  struct SurfaceModifierData *surmd;
 
  struct PartDeflect *pd;

  struct RNG *rng;
 
  /* precalculated for guides */
  struct GuideEffectorData *guide_data;
  float guide_loc[4], guide_dir[3], guide_radius;
 
  float frame;
  int flag;
} EffectorCache;
 
typedef struct EffectorRelation {
  struct EffectorRelation *next, *prev;
 
  struct Object *ob;
  struct ParticleSystem *psys;
  struct PartDeflect *pd;
} EffectorRelation;
 
struct PartDeflect *BKE_partdeflect_new(int type);
struct PartDeflect *BKE_partdeflect_copy(const struct PartDeflect *pd_src);
void BKE_partdeflect_free(struct PartDeflect *pd);

struct ListBase *BKE_effector_relations_create(struct Depsgraph *depsgraph,
                                               const struct Scene *scene,
                                               struct ViewLayer *view_layer,
                                               struct Collection *collection);
void BKE_effector_relations_free(struct ListBase *lb);

struct ListBase *BKE_effectors_create(struct Depsgraph *depsgraph,
                                      struct Object *ob_src,
                                      struct ParticleSystem *psys_src,
                                      struct EffectorWeights *weights,
                                      bool use_rotation);
void BKE_effectors_apply(struct ListBase *effectors,
                         struct ListBase *colliders,
                         struct EffectorWeights *weights,
                         struct EffectedPoint *point,
                         float *force,
                         float *wind_force,
                         float *impulse);
void BKE_effectors_free(struct ListBase *lb);
 
void pd_point_from_particle(struct ParticleSimulationData *sim,
                            struct ParticleData *pa,
                            struct ParticleKey *state,
                            struct EffectedPoint *point);
void pd_point_from_loc(
    struct Scene *scene, float *loc, float *vel, int index, struct EffectedPoint *point);
void pd_point_from_soft(
    struct Scene *scene, float *loc, float *vel, int index, struct EffectedPoint *point);
 
/* needed for boids */
float effector_falloff(struct EffectorCache *eff,
                       struct EffectorData *efd,
                       struct EffectedPoint *point,
                       struct EffectorWeights *weights);
bool closest_point_on_surface(struct SurfaceModifierData *surmd,
                              const float co[3],
                              float surface_co[3],
                              float surface_nor[3],
                              float surface_vel[3]);
bool get_effector_data(struct EffectorCache *eff,
                       struct EffectorData *efd,
                       struct EffectedPoint *point,
                       int real_velocity);
 
/* Required for `particle_system.cc`. */
#if 0
void do_physical_effector(struct EffectorData *eff,
                          struct EffectorPoint *point,
                          float *total_force);
float effector_falloff(struct EffectorData *eff,
                       struct EffectorPoint *point,
                       struct EffectorWeights *weights);
#endif
 
/* EffectedPoint->flag */
#define PE_WIND_AS_SPEED 1
#define PE_USE_NORMAL_DATA 4
 
/* EffectorData->flag */
#define PE_VELOCITY_TO_IMPULSE 1
 
/* ======== Simulation Debugging ======== */
 
unsigned int BKE_sim_debug_data_hash(int i);
unsigned int BKE_sim_debug_data_hash_combine(unsigned int kx, unsigned int ky);
 
/* _VA_SIM_DEBUG_HASH#(i, ...): combined hash value of multiple integers */
/* Internal helpers. */
#define _VA_SIM_DEBUG_HASH1(a) (BKE_sim_debug_data_hash(a))
#define _VA_SIM_DEBUG_HASH2(a, b) \
  (BKE_sim_debug_data_hash_combine(BKE_sim_debug_data_hash(a), _VA_SIM_DEBUG_HASH1(b)))
#define _VA_SIM_DEBUG_HASH3(a, b, c) \
  (BKE_sim_debug_data_hash_combine(BKE_sim_debug_data_hash(a), _VA_SIM_DEBUG_HASH2(b, c)))
#define _VA_SIM_DEBUG_HASH4(a, b, c, d) \
  (BKE_sim_debug_data_hash_combine(BKE_sim_debug_data_hash(a), _VA_SIM_DEBUG_HASH3(b, c, d)))
#define _VA_SIM_DEBUG_HASH5(a, b, c, d, e) \
  (BKE_sim_debug_data_hash_combine(BKE_sim_debug_data_hash(a), _VA_SIM_DEBUG_HASH4(b, c, d, e)))
#define _VA_SIM_DEBUG_HASH6(a, b, c, d, e, f) \
  (BKE_sim_debug_data_hash_combine(BKE_sim_debug_data_hash(a), _VA_SIM_DEBUG_HASH5(b, c, d, e, f)))
#define _VA_SIM_DEBUG_HASH7(a, b, c, d, e, f, g) \
  (BKE_sim_debug_data_hash_combine(BKE_sim_debug_data_hash(a), \
                                   _VA_SIM_DEBUG_HASH6(b, c, d, e, f, g)))
#define _VA_SIM_DEBUG_HASH8(a, b, c, d, e, f, g, h) \
  (BKE_sim_debug_data_hash_combine(BKE_sim_debug_data_hash(a), \
                                   _VA_SIM_DEBUG_HASH7(b, c, d, e, f, g, h)))
 
#define SIM_DEBUG_HASH(...) VA_NARGS_CALL_OVERLOAD(_VA_SIM_DEBUG_HASH, __VA_ARGS__)
 
typedef struct SimDebugElement {
  unsigned int category_hash;
  unsigned int hash;
 
  int type;
  float color[3];
 
  float v1[3], v2[3];
  char str[64];
} SimDebugElement;
 
typedef enum eSimDebugElement_Type {
  SIM_DEBUG_ELEM_DOT,
  SIM_DEBUG_ELEM_CIRCLE,
  SIM_DEBUG_ELEM_LINE,
  SIM_DEBUG_ELEM_VECTOR,
  SIM_DEBUG_ELEM_STRING,
} eSimDebugElement_Type;
 
typedef struct SimDebugData {
  struct GHash *gh;
} SimDebugData;
 
extern SimDebugData *_sim_debug_data;
 
void BKE_sim_debug_data_set_enabled(bool enable);
bool BKE_sim_debug_data_get_enabled(void);
void BKE_sim_debug_data_free(void);
 
void BKE_sim_debug_data_add_element(int type,
                                    const float v1[3],
                                    const float v2[3],
                                    const char *str,
                                    float r,
                                    float g,
                                    float b,
                                    const char *category,
                                    unsigned int hash);
void BKE_sim_debug_data_remove_element(unsigned int hash);
 
#define BKE_sim_debug_data_add_dot(p, r, g, b, category, ...) \
  { \
    const float v2[3] = {0.0f, 0.0f, 0.0f}; \
    BKE_sim_debug_data_add_element( \
        SIM_DEBUG_ELEM_DOT, p, v2, NULL, r, g, b, category, SIM_DEBUG_HASH(__VA_ARGS__)); \
  }
 
#define BKE_sim_debug_data_add_circle(p, radius, r, g, b, category, ...) \
  { \
    const float v2[3] = {radius, 0.0f, 0.0f}; \
    BKE_sim_debug_data_add_element( \
        SIM_DEBUG_ELEM_CIRCLE, p, v2, NULL, r, g, b, category, SIM_DEBUG_HASH(__VA_ARGS__)); \
  }
 
#define BKE_sim_debug_data_add_line(p1, p2, r, g, b, category, ...) \
  { \
    BKE_sim_debug_data_add_element( \
        SIM_DEBUG_ELEM_LINE, p1, p2, NULL, r, g, b, category, SIM_DEBUG_HASH(__VA_ARGS__)); \
  }
 
#define BKE_sim_debug_data_add_vector(p, d, r, g, b, category, ...) \
  { \
    BKE_sim_debug_data_add_element( \
        SIM_DEBUG_ELEM_VECTOR, p, d, NULL, r, g, b, category, SIM_DEBUG_HASH(__VA_ARGS__)); \
  }
 
#define BKE_sim_debug_data_add_string(p, str, r, g, b, category, ...) \
  { \
    BKE_sim_debug_data_add_element( \
        SIM_DEBUG_ELEM_STRING, p, NULL, str, r, g, b, category, SIM_DEBUG_HASH(__VA_ARGS__)); \
  }
 
#define BKE_sim_debug_data_remove(...) \
  BKE_sim_debug_data_remove_element(SIM_DEBUG_HASH(__VA_ARGS__))
 
void BKE_sim_debug_data_clear(void);
void BKE_sim_debug_data_clear_category(const char *category);