/**
 * PANDA 3D SOFTWARE
 * Copyright (c) Carnegie Mellon University.  All rights reserved.
 *
 * All use of this software is subject to the terms of the revised BSD
 * license.  You should have received a copy of this license along
 * with this source code in a file named "LICENSE."
 *
 * @file physxSoftBodyMeshDesc.cxx
 * @author enn0x
 * @date 2010-09-12
 */

#include "physxSoftBodyMeshDesc.h"
#include "physxManager.h"

/**
 * Sets the number of vertices to be stored within this soft body mesh.  The
 * function allocates memory for the vertices, but it does not set any
 * vertices.
 *
 * This method must be called before any calls to set_vertex are done!
 */
void PhysxSoftBodyMeshDesc::
set_num_vertices(unsigned int numVertices) {

  // Vertices
  if (_desc.vertices) {
    delete [] _vertices;
  }

  _vertices = new NxVec3[numVertices];

  _desc.numVertices = numVertices;
  _desc.vertices = _vertices;
}

/**
 * Sets a single vertex.  You have to call the function set_num_vertices
 * before you can call this function.
 */
void PhysxSoftBodyMeshDesc::
set_vertex(unsigned int idx, const LPoint3f &vert) {

  nassertv(_desc.numVertices > idx);

  _vertices[idx] = PhysxManager::point3_to_nxVec3(vert);
}

/**
 * Sets the number of tetrahedra to be stored in this soft body mesh.
 *
 * This method must be called before any calls to set_tetrahedron are done!
 */
void PhysxSoftBodyMeshDesc::
set_num_tetrahedra(unsigned int numTetrahedra) {

  if (_desc.tetrahedra) {
    delete [] _tetrahedra;
  }

  _tetrahedra = new NxU32[4 * numTetrahedra];

  _desc.numTetrahedra = numTetrahedra;
  _desc.tetrahedra = _tetrahedra;
}

/**
 * Sets a single tetrahedron, by providing the three indices i1, i2, i3, i4.
 */
void PhysxSoftBodyMeshDesc::
set_tetrahedron(unsigned int idx,
                unsigned int i1, unsigned int i2, unsigned int i3, unsigned int i4) {

  nassertv(_desc.numTetrahedra > idx);

  idx = 4 * idx;
  _tetrahedra[idx]     = i1;
  _tetrahedra[idx + 1] = i2;
  _tetrahedra[idx + 2] = i3;
  _tetrahedra[idx + 3] = i4;
}