physxTriangleMeshDesc.cxx

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/**
 * 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 physxTriangleMeshDesc.cxx
 * @author enn0x
 * @date 2009-10-11
 */

#include "physxTriangleMeshDesc.h"
#include "physxManager.h"

#include "nodePathCollection.h"
#include "geomNode.h"
#include "geomVertexReader.h"

/**
 * Sets the number of vertices to be stored within this triangle 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 PhysxTriangleMeshDesc::
set_num_vertices(unsigned int numVertices) {

  if (_desc.points) {
    delete [] _vertices;
  }

  _vertices = new NxVec3[numVertices];

  _desc.numVertices = numVertices;
  _desc.points = _vertices;
}

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

  nassertv(_desc.numVertices > idx);
  _vertices[idx] = PhysxManager::point3_to_nxVec3(vert);
}

/**
 * Sets the number of triangles to be stored in this triangle mesh.
 *
 * This method must be called before any calls to set_triangle are done!
 */
void PhysxTriangleMeshDesc::
set_num_triangles(unsigned int numTriangles, bool use_material_indices) {

  if (_desc.triangles) {
    delete [] _triangles;
  }

  if (_desc.materialIndices) {
    delete [] _materials;
  }

  _triangles = new NxU32[3 * numTriangles];

  _desc.numTriangles = numTriangles;
  _desc.triangles = _triangles;

  if (use_material_indices == true) {
    _materials = new NxMaterialIndex[numTriangles];
    _desc.materialIndices = _materials;
  }
}

/**
 * Sets a single triangle, by providing the three indices i1, i2, i3.
 */
void PhysxTriangleMeshDesc::
set_triangle(unsigned int idx,
             unsigned int i1, unsigned int i2, unsigned int i3,
             unsigned int material_index) {

  nassertv(_desc.numTriangles > idx);

  if (_desc.materialIndices) {
    _materials[idx] = (NxMaterialIndex) material_index;
  }

  idx = 3 * idx;
  _triangles[idx] = i1;
  _triangles[idx + 1] = i2;
  _triangles[idx + 2] = i3;
}

/**
 *
 */
const NxTriangleMeshDesc &PhysxTriangleMeshDesc::
get_desc() const {

  return _desc;
}

/**
 * A convenience method to set the mesh data from a NodePath in a single call.
 * The method iterates over the NodePath geoms and collects data for the
 * triangle mesh.
 *
 * Do not use the following function when using this one: - set_num_vertices -
 * set_vertex - set_num_triangles - set_triangle
 */
void PhysxTriangleMeshDesc::
set_from_node_path(const NodePath &np) {

  pvector<LPoint3f> dataVertices;
  pvector<int> dataIndices;

  // Collect data from NodePath
  NodePathCollection npc = np.find_all_matches( "**/+GeomNode" );
  for (int i=0; i<npc.get_num_paths(); i++) {
    NodePath gnp = npc.get_path(i);
    GeomNode *gnode = DCAST(GeomNode, gnp.node());

    for (int j=0; j<gnode->get_num_geoms(); j++) {
      CPT(Geom) geom = gnode->get_geom(j);

      // Vertices
      CPT(GeomVertexData) vdata = geom->get_vertex_data();
      GeomVertexReader reader = GeomVertexReader(vdata, InternalName::get_vertex());

      while (!reader.is_at_end()) {
        dataVertices.push_back(reader.get_data3f());
      }

      // Indices
      for (int k=0; k<geom->get_num_primitives(); k++) {

        CPT(GeomPrimitive) prim = geom->get_primitive(k);
        prim = prim->decompose();

        for (int l=0; l<prim->get_num_primitives(); l++) {

          int s = prim->get_primitive_start(l);
          int e = prim->get_primitive_end(l);

          for (int l=s; l<e; l++) {
            dataIndices.push_back(prim->get_vertex(l));
          }
        }
      }
    }
  }

  // Set descriptor members
  int i;

  NxU32 numVertices = dataVertices.size();
  NxU32 numTriangles = dataIndices.size() / 3;

  _vertices = new NxVec3[numVertices];
  _triangles = new NxU32[3 * numTriangles];

  i = 0;
  pvector<LPoint3f>::const_iterator vit;
  for (vit=dataVertices.begin(); vit!=dataVertices.end(); vit++) {
    LPoint3f v = *vit;

    _vertices[i].x = v.get_x();
    _vertices[i].y = v.get_y();
    _vertices[i].z = v.get_z();
    i++;
  }

  i = 0;
  pvector<int>::const_iterator iit;
  for(iit=dataIndices.begin(); iit!=dataIndices.end(); iit++) {
    NxU32 idx = *iit;

    _triangles[i] = idx;
    i++;
  }

  _desc.numVertices = numVertices;
  _desc.points = _vertices;
  _desc.numTriangles = numTriangles;
  _desc.triangles = _triangles;
}