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/* SPDX-License-Identifier: GPL-2.0-or-later */
/** \file
* \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, round_fl_to_int(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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