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/*
* ***** 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.
*
* Contributor(s): Campbell Barton
*
* ***** END GPL LICENSE BLOCK *****
*/
/** \file blender/modifiers/intern/MOD_meshcache_util.c
* \ingroup modifiers
*/
#include "BLI_utildefines.h"
#include "BLI_math.h"
#include "DNA_modifier_types.h"
#include "MOD_meshcache_util.h"
void MOD_meshcache_calc_range(const float frame, const char interp,
const int frame_tot,
int r_index_range[2], float *r_factor)
{
if (interp == MOD_MESHCACHE_INTERP_NONE) {
r_index_range[0] = r_index_range[1] = max_ii(0, min_ii(frame_tot - 1, iroundf(frame)));
*r_factor = 1.0f; /* dummy */
}
else {
const float tframe = floorf(frame);
const float range = frame - tframe;
r_index_range[0] = (int)tframe;
if (range <= FRAME_SNAP_EPS) {
/* we're close enough not to need blending */
r_index_range[1] = r_index_range[0];
*r_factor = 1.0f; /* dummy */
}
else {
/* blend between 2 frames */
r_index_range[1] = r_index_range[0] + 1;
*r_factor = range;
}
/* clamp */
if ((r_index_range[0] >= frame_tot) ||
(r_index_range[1] >= frame_tot))
{
r_index_range[0] = r_index_range[1] = frame_tot - 1;
*r_factor = 1.0f; /* dummy */
}
else if ((r_index_range[0] < 0) ||
(r_index_range[1] < 0))
{
r_index_range[0] = r_index_range[1] = 0;
*r_factor = 1.0f; /* dummy */
}
}
}
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