raytracer/LessfOperator.h at master · markuskr/raytracer · GitHub

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//----------------------------------------------------------------------
/// \author Group:    20
/// \brief The operator for the lessf function.
/// Last Changes: 22.06.2008
//----------------------------------------------------------------------

#ifndef LESSFOPERATOR_H_
#define LESSFOPERATOR_H_

#include "GMLOperator.h"
#include "GMLToken.h"
#include "TokenTypes.h"

#include <vector>
#include <string>
#include <memory>

#include <iostream>

class LessfOperator : public GMLOperator
{
public:
  //-------------------------------------------------------------------
  ///  \param stack execution stack of the interpreter

  LessfOperator(std::vector<GMLToken> &stack) :
    GMLOperator(stack)
  {
    m_name = "lessf";
  };

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

  ~LessfOperator()
  {};

  //-------------------------------------------------------------------
  /// \brief execution of the token

  void execute() const
  {
    GMLToken operand1;
    GMLToken operand2;

    if (m_stack.empty())
      throw std::runtime_error("ERROR lessf: Stack is empty");

    operand1 = m_stack.back();
    m_stack.pop_back();

    if (m_stack.empty())
      throw std::runtime_error("ERROR lessf: Stack is empty");

    operand2 = m_stack.back();
    m_stack.pop_back();

    if ((operand1.m_type == FLOAT) && (operand2.m_type == FLOAT))
    {
      int result = 0;
      if (operand2.m_float[0] > operand1.m_float[0])
        result = 1;

      GMLToken token;
      token.m_type = INTEGER;
      token.m_int[0] = result;

      m_stack.push_back(token);
    }
    else
      throw std::runtime_error("ERROR lessf: Wrong operand-type");
  };

};

#endif /*LESSFOPERATOR_H_*/