MOD_meshcache_util.c

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/*
 * 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.
 */
 
#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 */
    }
  }
}