DtIndirectIndicesHelper.h

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/******************************************************************************
** Copyright (c) 2023 MAK Technologies, Inc.
** All rights reserved.
******************************************************************************/


#pragma once

#include <vrvOsg/vrvOsg.h>

#include <vrvMath/DtAssert.h>

#include <vector>
#include <string>

namespace osg
{
   class Geometry;
   class PrimitiveSet;
}

namespace makVrv
{
   class DtDe;

   class DT_DLL_VRVOSG DtIndirectIndicesHelper
   {
   public:
      DtIndirectIndicesHelper(DtDe& de);

      virtual ~DtIndirectIndicesHelper();

      DtIndirectIndicesHelper(const DtIndirectIndicesHelper&) = delete;

      DtIndirectIndicesHelper& operator=(const DtIndirectIndicesHelper&) = delete;

   public:
      virtual void copyIndices(std::vector<int>& indices, const osg::Geometry& srcGeometry) const;

      virtual int calculateNumIndices(const osg::Geometry& srcGeometry) const;

      virtual void setModelName(const std::string& modelname);

      virtual bool isModeSupported(int mode) const;

      virtual std::string toModeString(int mode) const;

      virtual void setCopyRange(int primitiveSetIndex, int startIndex, int endIndex, int startVertex);

   protected:
      virtual bool checkSrcIndicesOk(const osg::Geometry& srcGeometry) const;

      virtual bool checkAndCopyIndicesIfTriangleElements(std::vector<int>& indices, const osg::PrimitiveSet* primitiveSet) const;

      virtual bool checkAndCopyIndicesIfDrawArrays(std::vector<int>& indices, const osg::PrimitiveSet* primitiveSet) const;

      virtual void printDetailsPrimitiveSets(const osg::Geometry& geometry) const;

      virtual int calculateNumIndices(const osg::PrimitiveSet* primitiveSet) const;

   protected:
      // used only for outputting debug messages
      std::string myModelFileName;

      DtDe& myDe;

      int myPrimitiveSetIndex = -1;
      
      int myStartIndex = -1;
      
      int myEndIndex = -1;
      
      int myStartVertex = -1;
   };
}