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myGLRendererStateVariables.cpp

Go to the documentation of this file.

#include "myGLRendererStateVariables.h"
#include <GL/glut.h>

#include <iostream>
using std::cout;
using std::endl;

namespace X3DTK
{
  namespace GL
  {

    MyRendererStateVariables::MyRendererStateVariables()
        : StateVariables()
        , boundedObject(NULL)
    {}

    MyRendererStateVariables::~MyRendererStateVariables()
    {}

    void MyRendererStateVariables::initSelect(double , double )
    {
      glSelectBuffer(32768, _hits);
      glRenderMode(GL_SELECT);
      glInitNames();
      glPushName(0);
    }

    void MyRendererStateVariables::finishSelect()
    {
      glFlush();

      _shape = 0;

      // Get the results
      GLint nb_hits = glRenderMode(GL_RENDER);

      // Too many elements in selection buffer
      if (nb_hits <= 0)
      {
        cout << "found nothing" << endl;
        _shapeVector.clear();
        return;
      }
      else
        cout << nb_hits << " hits:" << endl;


      for (unsigned int i = 0; i < static_cast<unsigned int>(nb_hits*4 + 1); ++i)
        cout << _hits[i] << endl;

      //interpreting the results.
      unsigned zMin = _hits[2];
      int selectedId(_hits[3]);

      for (int j = 1; j < nb_hits; ++j)
      {
        // Prefer vertices over edges and edges over faces
        if (_hits[j*4 + 2] < zMin)
        {
          zMin = _hits[j*4 + 2];
          selectedId = _hits[j*4 + 3];
        }
      }

      cout << "found " << selectedId << " in " << _shapeVector.size() << endl;
      //_shape = _shapeVector[selectedId];

      /*  _matrixStack.clear();
        _matrixVector.clear();*/
      _shapeVector.clear();
    }

    void MyRendererStateVariables::storeShape(X3DShapeNode *S)
    {
      _shapeVector.push_back(S);
    }

    void MyRendererStateVariables::setSelectionMode(bool value)
    {
      _selectionMode = value;
    }


  }
}

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