text: /*
  * All or portions of this file Copyright (c) Amazon.com, Inc. or its affiliates or
  * its licensors.
  *
  * For complete copyright and license terms please see the LICENSE at the root of this
  * distribution (the "License"). All use of this software is governed by the License,
  * or, if provided, by the license below or the license accompanying this file. Do not
  * remove or modify any license notices. This file is distributed on an "AS IS" BASIS,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  *
  */
  // Original file Copyright Crytek GMBH or its affiliates, used under license.
  
  #pragma once
  ////////////////////////////////////////////////////////////////////////////
  //  Crytek Engine Source File.
  //  (c) 2001 - 2014 Crytek GmbH
  // -------------------------------------------------------------------------
  //  File name:   SubdivisionModifier.h
  //  Created:     Sep/4/2014 by Jaesik.
  ////////////////////////////////////////////////////////////////////////////
  
  #include "HalfEdgeMesh.h"
  
  namespace CD
  {
      struct SSubdivisionContext
      {
          _smart_ptr<HalfEdgeMesh> fullPatches;
          _smart_ptr<HalfEdgeMesh> transitionPatches;
      };
  };
  
  class SubdivisionModifier
      : public CRefCountBase
  {
  public:
  
      CD::SSubdivisionContext CreateSubdividedMesh(CD::Model* pModel, int nSubdivisionLevel, int nTessFactor);
  
  private:
  
      CD::SSubdivisionContext CreateSubdividedMesh(CD::SSubdivisionContext& sc);
  
      struct SPos
      {
          enum EVertexType
          {
              eVT_Valid = BIT(0),
              eVT_Corner = BIT(1)
          };
          SPos(int _pos_index, char _flag = eVT_Valid)
              : pos_index(_pos_index)
              , flag(_flag) {}
          int pos_index;
          char flag;
          bool IsValid() const { return flag & eVT_Valid; }
          bool IsCorner() const { return flag & eVT_Corner; }
      };
  
      void CalculateNextLocations(
          CD::HalfEdgeMesh* pHalfEdgeMesh,
          std::vector<CD::HE_Position>& outNextPosList,
          std::vector<SPos>& outNextFaceLocations,
          std::vector<SPos>& outNextEdgeLocations,
          std::vector<SPos>& outNextVertexLocations);
  };