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/* SPDX-License-Identifier: GPL-2.0-or-later
* Copyright Blender Foundation. All rights reserved. */
#pragma once
/** \file
* \ingroup bke
*/
#ifdef __cplusplus
extern "C" {
#endif
struct BVHTree;
struct Collection;
struct CollisionModifierData;
struct Depsgraph;
struct MVertTri;
struct Object;
struct Scene;
////////////////////////////////////////
// used for collisions in collision.c
////////////////////////////////////////
/* COLLISION FLAGS */
typedef enum {
COLLISION_IN_FUTURE = (1 << 1),
#ifdef WITH_ELTOPO
COLLISION_USE_COLLFACE = (1 << 2),
COLLISION_IS_EDGES = (1 << 3),
#endif
COLLISION_INACTIVE = (1 << 4),
} COLLISION_FLAGS;
////////////////////////////////////////
// used for collisions in collision.c
////////////////////////////////////////
/* used for collisions in collision.c */
typedef struct CollPair {
unsigned int face1; /* cloth face */
unsigned int face2; /* object face */
float distance;
float normal[3];
float vector[3]; /* unnormalized collision vector: p2-p1 */
float pa[3], pb[3]; /* collision point p1 on face1, p2 on face2 */
int flag;
float time; /* collision time, from 0 up to 1 */
/* mesh-mesh collision */
#ifdef WITH_ELTOPO /* Either ap* or bp* can be set, but not both. */
float bary[3];
int ap1, ap2, ap3, collp, bp1, bp2, bp3;
int collface;
#else
int ap1, ap2, ap3, bp1, bp2, bp3;
#endif
int pointsb[4];
} CollPair;
/* used for collisions in collision.c */
typedef struct EdgeCollPair {
unsigned int p11, p12, p21, p22;
float normal[3];
float vector[3];
float time;
int lastsign;
float pa[3], pb[3]; /* collision point p1 on face1, p2 on face2 */
} EdgeCollPair;
/* used for collisions in collision.c */
typedef struct FaceCollPair {
unsigned int p11, p12, p13, p21;
float normal[3];
float vector[3];
float time;
int lastsign;
float pa[3], pb[3]; /* collision point p1 on face1, p2 on face2 */
} FaceCollPair;
////////////////////////////////////////
/////////////////////////////////////////////////
// forward declarations
/////////////////////////////////////////////////
/////////////////////////////////////////////////
// used in modifier.cc from collision.c
/////////////////////////////////////////////////
struct BVHTree *bvhtree_build_from_mvert(const float (*positions)[3],
const struct MVertTri *tri,
int tri_num,
float epsilon);
void bvhtree_update_from_mvert(struct BVHTree *bvhtree,
const float (*positions)[3],
const float (*positions_moving)[3],
const struct MVertTri *tri,
int tri_num,
bool moving);
/////////////////////////////////////////////////
/**
* Move Collision modifier object inter-frame with step = [0,1]
*
* \param step: is limited from 0 (frame start position) to 1 (frame end position).
*/
void collision_move_object(struct CollisionModifierData *collmd,
float step,
float prevstep,
bool moving_bvh);
void collision_get_collider_velocity(float vel_old[3],
float vel_new[3],
struct CollisionModifierData *collmd,
struct CollPair *collpair);
/* Collision relations for dependency graph build. */
typedef struct CollisionRelation {
struct CollisionRelation *next, *prev;
struct Object *ob;
} CollisionRelation;
/**
* Create list of collision relations in the collection or entire scene.
* This is used by the depsgraph to build relations, as well as faster
* lookup of colliders during evaluation.
*/
struct ListBase *BKE_collision_relations_create(struct Depsgraph *depsgraph,
struct Collection *collection,
unsigned int modifier_type);
void BKE_collision_relations_free(struct ListBase *relations);
/* Collision object lists for physics simulation evaluation. */
/**
* Create effective list of colliders from relations built beforehand.
* Self will be excluded.
*/
struct Object **BKE_collision_objects_create(struct Depsgraph *depsgraph,
struct Object *self,
struct Collection *collection,
unsigned int *numcollobj,
unsigned int modifier_type);
void BKE_collision_objects_free(struct Object **objects);
typedef struct ColliderCache {
struct ColliderCache *next, *prev;
struct Object *ob;
struct CollisionModifierData *collmd;
} ColliderCache;
/**
* Create effective list of colliders from relations built beforehand.
* Self will be excluded.
*/
struct ListBase *BKE_collider_cache_create(struct Depsgraph *depsgraph,
struct Object *self,
struct Collection *collection);
void BKE_collider_cache_free(struct ListBase **colliders);
/////////////////////////////////////////////////
/////////////////////////////////////////////////
#ifdef __cplusplus
}
#endif
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