/*
 * ***** 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 *
 * The Original Code is Copyright (C) 2009 Blender Foundation, Joshua Leung
 * All rights reserved.
 *
 * The Original Code is: all of this file.
 *
 * Contributor(s): Joshua Leung (full recode)
 *
 * ***** END GPL LICENSE BLOCK *****
 */

/** \file blender/blenkernel/nla_private.h
 *  \ingroup bke
 */


#ifndef __NLA_PRIVATE_H__
#define __NLA_PRIVATE_H__

/* --------------- NLA Evaluation DataTypes ----------------------- */

/* used for list of strips to accumulate at current time */
typedef struct NlaEvalStrip {
	struct NlaEvalStrip *next, *prev;
	
	NlaTrack *track;            /* track that this strip belongs to */
	NlaStrip *strip;            /* strip that's being used */
	
	short track_index;          /* the index of the track within the list */
	short strip_mode;           /* which end of the strip are we looking at */
	
	float strip_time;           /* time at which which strip is being evaluated */
} NlaEvalStrip;

/* NlaEvalStrip->strip_mode */
enum {
	/* standard evaluation */
	NES_TIME_BEFORE = -1,
	NES_TIME_WITHIN,
	NES_TIME_AFTER,
	
	/* transition-strip evaluations */
	NES_TIME_TRANSITION_START,
	NES_TIME_TRANSITION_END,
} eNlaEvalStrip_StripMode;


/* temp channel for accumulating data from NLA (avoids needing to clear all values first) */
// TODO: maybe this will be used as the 'cache' stuff needed for editable values too?
typedef struct NlaEvalChannel {
	struct NlaEvalChannel *next, *prev;
	
	PointerRNA ptr;         /* pointer to struct containing property to use */
	PropertyRNA *prop;      /* RNA-property type to use (should be in the struct given) */
	int index;              /* array index (where applicable) */
	
	float value;            /* value of this channel */
} NlaEvalChannel;

/* --------------- NLA Functions (not to be used as a proper API) ----------------------- */

/* convert from strip time <-> global time */
float nlastrip_get_frame(NlaStrip *strip, float cframe, short mode);

/* --------------- NLA Evaluation (very-private stuff) ----------------------- */
/* these functions are only defined here to avoid problems with the order in which they get defined... */

NlaEvalStrip *nlastrips_ctime_get_strip(ListBase *list, ListBase *strips, short index, float ctime);
void nlastrip_evaluate(PointerRNA *ptr, ListBase *channels, ListBase *modifiers, NlaEvalStrip *nes);
void nladata_flush_channels(ListBase *channels);

#endif  /* __NLA_PRIVATE_H__ */
