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/**
* $Id$
*
* ***** BEGIN GPL LICENSE BLOCK *****
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
* The Original Code is Copyright (C) 2001-2002 by NaN Holding BV.
* All rights reserved.
*
* The Original Code is: all of this file.
*
* Contributor(s): 2007 - Joshua Leung (major recode)
*
* ***** END GPL LICENSE BLOCK *****
*/
#ifndef BKE_CONSTRAINT_H
#define BKE_CONSTRAINT_H
struct bConstraint;
struct bConstraintTarget;
struct ListBase;
struct Object;
struct bConstraintChannel;
struct bPoseChannel;
/* ---------------------------------------------------------------------------- */
/* special struct for use in constraint evaluation */
typedef struct bConstraintOb {
struct Object *ob; /* if pchan, then armature that it comes from, otherwise constraint owner */
struct bPoseChannel *pchan; /* pose channel that owns the constraints being evaluated */
float matrix[4][4]; /* matrix where constraints are accumulated + solved */
float startmat[4][4]; /* original matrix (before constraint solving) */
short type; /* type of owner */
} bConstraintOb;
/* ---------------------------------------------------------------------------- */
/* Constraint Type-Info (shorthand in code = cti):
* This struct provides function pointers for runtime, so that functions can be
* written more generally (with fewer/no special exceptions for various constraints).
*
* Callers of these functions must check that they actually point to something useful,
* as some constraints don't define some of these.
*
* Warning: it is not too advisable to reorder order of members of this struct,
* as you'll have to edit quite a few ($NUM_CONSTRAINT_TYPES) of these
* structs.
*/
typedef struct bConstraintTypeInfo {
/* admin/ident */
short type; /* CONSTRAINT_TYPE_### */
short size; /* size in bytes of the struct */
char name[32]; /* name constraint in interface */
char structName[32]; /* name of struct for SDNA */
/* data management function pointers - special handling */
/* free any data that is allocated separately (optional) */
void (*free_data)(struct bConstraint *con);
/* adjust pointer to other ID-data using ID_NEW(), but not to targets (optional) */
void (*relink_data)(struct bConstraint *con);
/* copy any special data that is allocated separately (optional) */
void (*copy_data)(struct bConstraint *con, struct bConstraint *src);
/* set settings for data that will be used for bConstraint.data (memory already allocated) */
void (*new_data)(void *cdata);
/* target handling function pointers */
/* for multi-target constraints: return that list; otherwise make a temporary list */
void (*get_constraint_targets)(struct bConstraint *con, struct ListBase *list);
/* for single-target constraints only: flush data back to source data, and the free memory used */
void (*flush_constraint_targets)(struct bConstraint *con, struct ListBase *list, short nocopy);
/* evaluation */
/* set the ct->matrix for the given constraint target (at the given ctime) */
void (*get_target_matrix)(struct bConstraint *con, struct bConstraintOb *cob, struct bConstraintTarget *ct, float ctime);
/* evaluate the constraint for the given time */
void (*evaluate_constraint)(struct bConstraint *con, struct bConstraintOb *cob, struct ListBase *targets);
} bConstraintTypeInfo;
/* Function Prototypes for bConstraintTypeInfo's */
bConstraintTypeInfo *constraint_get_typeinfo(struct bConstraint *con);
bConstraintTypeInfo *get_constraint_typeinfo(int type);
/* ---------------------------------------------------------------------------- */
/* Useful macros for testing various common flag combinations */
/* Constraint Target Macros */
#define VALID_CONS_TARGET(ct) ((ct) && (ct->tar))
/* ---------------------------------------------------------------------------- */
/* Constraint function prototypes */
void unique_constraint_name(struct bConstraint *con, struct ListBase *list);
void free_constraints(struct ListBase *conlist);
void copy_constraints(struct ListBase *dst, struct ListBase *src);
void relink_constraints(struct ListBase *list);
void free_constraint_data(struct bConstraint *con);
/* Constraint Channel function prototypes */
struct bConstraintChannel *get_constraint_channel(struct ListBase *list, const char *name);
struct bConstraintChannel *verify_constraint_channel(struct ListBase *list, const char *name);
void do_constraint_channels(struct ListBase *conbase, struct ListBase *chanbase, float ctime, short onlydrivers);
void copy_constraint_channels(struct ListBase *dst, struct ListBase *src);
void clone_constraint_channels(struct ListBase *dst, struct ListBase *src);
void free_constraint_channels(struct ListBase *chanbase);
/* Constraint Evaluation function prototypes */
struct bConstraintOb *constraints_make_evalob(struct Object *ob, void *subdata, short datatype);
void constraints_clear_evalob(struct bConstraintOb *cob);
void constraint_mat_convertspace(struct Object *ob, struct bPoseChannel *pchan, float mat[][4], short from, short to);
void get_constraint_target_matrix(struct bConstraint *con, int n, short ownertype, void *ownerdata, float mat[][4], float ctime);
void solve_constraints(struct ListBase *conlist, struct bConstraintOb *cob, float ctime);
#endif
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