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sglLOD.hpp

/*****************************************************************************
 * SGL: A Scene Graph Library
 *
 * Copyright (C) 1997-2001  Scott McMillan   All Rights Reserved.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library 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
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public
 * License along with this library; if not, write to the Free
 * Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 *****************************************************************************
 *     File: sglLOD.hpp
 *  Created: 14 November 1998
 *  Summary: select (or not) the children to be traversed based on range
 *****************************************************************************/

#ifndef __SGL_LOD_HPP
#define __SGL_LOD_HPP

#include <sgl.h>
#include <vector>

#include <sglVector.hpp>
#include <sglGroup.hpp>
#include <sglLODState.hpp>

//----------------------------------------------------------------------------

class SGL_DLL_API sglLOD : public sglGroup
{
public:
   sglLOD();
   virtual ~sglLOD();

   unsigned int getNumRanges() const { return m_ranges.size(); }

   void  setRange(unsigned int index, float range);

   float getRange(unsigned int index) const;

   void setCenter(const sglVec3f &center) { m_center = center; }

   const sglVec3f &getCenter() const { return m_center; }

   static void setScaleFactor(float scale) { s_range_scale = scale; }

   static float getScaleFactor() { return s_range_scale; }

   void setLODState(sglLODState *lod_state);

   sglLODState *getLODState() const { return m_lod_state; }

   // see sglNode::intersect(f) for details.
   virtual sglBound::IntersectResultEnum intersect(
      sglIntersectf &isector) const;

   // see sglNode::intersect(d) for details.
   virtual sglBound::IntersectResultEnum intersect(
      sglIntersectd &isector) const;

   // see sglNode::pick(f) for details.
   virtual void pick(sglPickf &pick_state, unsigned int cull_flags) const;

   // see sglNode::pick(d) for details.
   virtual void pick(sglPickd &pick_state, unsigned int cull_flags) const;

   // See sglNode::clone() for details.
   virtual sglNode *clone(unsigned int mode) const;

   // See sglObject::printInfo() for details.
   virtual void printInfo(ostream &ostrm, const char *indent_string) const;

protected:
   // See sglNode::cull(f) for details
   virtual void cull(sglCull<float> &trav_state,
                     unsigned int cull_flags) const;

   // See sglNode::cull(d) for details
   virtual void cull(sglCull<double> &trav_state,
                     unsigned int cull_flags) const;

   // If a user wants to subclass this node and replace the equation used for
   // determining the range used in child selection, the following function
   // should be reimplemented in the subclass (one each for single and double
   // precision traversals.
   virtual float computeRange(float trav_lod_scale,
                              float trav_lod_offset,
                              const sglMat4f &view_matrix) const;
   virtual float computeRange(float trav_lod_scale,
                              float trav_lod_offset,
                              const sglMat4d &view_matrix) const;

   void copyTo(sglLOD *dst, unsigned int mode) const;

private: // not implemented
   sglLOD(const sglLOD &);
   sglLOD &operator=(const sglLOD &);

protected:
   static float s_range_scale;

   sglVec3f m_center;
   vector<float> m_ranges;

   sglLODState *m_lod_state;
};

#endif

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