/*
 * 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) Blender Foundation
 * All rights reserved.
 */

/** \file
 * \ingroup bke
 */

#include "MEM_guardedalloc.h"

#include "DNA_mesh_types.h"
#include "DNA_meshdata_types.h"
#include "DNA_object_types.h"

#include "BLI_math.h"

#include "BKE_customdata.h"
#include "BKE_fluidsim.h"
#include "BKE_library.h"
#include "BKE_mesh_runtime.h"

/* ************************* fluidsim bobj file handling **************************** */

//-------------------------------------------------------------------------------
// file handling
//-------------------------------------------------------------------------------

void initElbeemMesh(struct Depsgraph *depsgraph,
                    struct Scene *scene,
                    struct Object *ob,
                    int *numVertices,
                    float **vertices,
                    int *numTriangles,
                    int **triangles,
                    int useGlobalCoords,
                    int modifierIndex)
{
  Mesh *mesh;
  const MVert *mvert;
  const MLoop *mloop;
  const MLoopTri *looptri, *lt;
  int i, mvert_num, looptri_num;
  float *verts;
  int *tris;

  mesh = mesh_create_eval_final_index_render(
      depsgraph, scene, ob, &CD_MASK_BAREMESH, modifierIndex);

  mvert = mesh->mvert;
  mloop = mesh->mloop;
  looptri = BKE_mesh_runtime_looptri_ensure(mesh);
  mvert_num = mesh->totvert;
  looptri_num = mesh->runtime.looptris.len;

  *numVertices = mvert_num;
  verts = MEM_mallocN(mvert_num * sizeof(float[3]), "elbeemmesh_vertices");
  for (i = 0; i < mvert_num; i++) {
    copy_v3_v3(&verts[i * 3], mvert[i].co);
    if (useGlobalCoords) {
      mul_m4_v3(ob->obmat, &verts[i * 3]);
    }
  }
  *vertices = verts;

  *numTriangles = looptri_num;
  tris = MEM_mallocN(looptri_num * sizeof(int[3]), "elbeemmesh_triangles");
  for (i = 0, lt = looptri; i < looptri_num; i++, lt++) {
    tris[(i * 3) + 0] = mloop[lt->tri[0]].v;
    tris[(i * 3) + 1] = mloop[lt->tri[1]].v;
    tris[(i * 3) + 2] = mloop[lt->tri[2]].v;
  }
  *triangles = tris;

  BKE_id_free(NULL, mesh);
}