51 lines
1.4 KiB
C++
51 lines
1.4 KiB
C++
/* SPDX-FileCopyrightText: 2023 Blender Authors
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*
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* SPDX-License-Identifier: GPL-2.0-or-later */
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/** \file
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* \ingroup modifiers
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*/
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#include "BLI_math_base.h"
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#include "DNA_modifier_types.h"
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#include "MOD_meshcache_util.hh"
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void MOD_meshcache_calc_range(const float frame,
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const char interp,
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const int frame_tot,
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int r_index_range[2],
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float *r_factor)
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{
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if (interp == MOD_MESHCACHE_INTERP_NONE) {
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r_index_range[0] = r_index_range[1] = max_ii(0, min_ii(frame_tot - 1, round_fl_to_int(frame)));
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*r_factor = 1.0f; /* dummy */
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}
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else {
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const float tframe = floorf(frame);
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const float range = frame - tframe;
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r_index_range[0] = int(tframe);
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if (range <= FRAME_SNAP_EPS) {
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/* we're close enough not to need blending */
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r_index_range[1] = r_index_range[0];
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*r_factor = 1.0f; /* dummy */
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}
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else {
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/* blend between 2 frames */
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r_index_range[1] = r_index_range[0] + 1;
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*r_factor = range;
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}
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/* clamp */
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if ((r_index_range[0] >= frame_tot) || (r_index_range[1] >= frame_tot)) {
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r_index_range[0] = r_index_range[1] = frame_tot - 1;
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*r_factor = 1.0f; /* dummy */
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}
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else if ((r_index_range[0] < 0) || (r_index_range[1] < 0)) {
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r_index_range[0] = r_index_range[1] = 0;
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*r_factor = 1.0f; /* dummy */
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}
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}
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}
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