include/vamos/geometry/Material.h

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//      Vamos Automotive Simulator
//  Copyright (C) 2001--2002 Sam Varner
//
//  This program is free software; you can redistribute it and/or modify
//  it under the terms of the GNU General Public License as published by
//  the Free Software Foundation; either version 2 of the License, or
//  (at your option) any later version.
//
//  This program 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 General Public License for more details.
//
//  You should have received a copy of the GNU General Public License
//  along with this program; if not, write to the Free Software
//  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

#ifndef _SURFACE_H_
#define _SURFACE_H_

#include <vamos/geometry/Gl_Texture_Image.h>
#include <vamos/geometry/Handle.h>

#include <string>

namespace Vamos_Geometry
{
  class Material;
  typedef Handle <Material> Material_Handle;

  class Material
  {
  public:
        enum Material_Type
          {
                RUBBER,
                METAL,
                ASPHALT,
                CONCRETE,
                GRASS,
                GRAVEL,
                DIRT,
                UNKNOWN
          };

  private:
        Material_Type m_type;

        // The frictional properties of the car are muliplied by these factors
        // for this particular surface.  They should all be 1.0 for pavement.
        double m_friction_factor;
        double m_restitution_factor;
        double m_rolling_resistance_factor;
        double m_drag_factor;

        double m_bump_amplitude;
        double m_bump_wavelength;

        // The texture that gets mapped to this surface.
        Gl_Texture_Image* mp_texture_image;

  public:
        Material (Material_Type type, double friction, double restitution,
                          double rolling = 0.0, double drag = 0.0, 
                          double bump_amplitude = 0.0, double bump_wavelength = 0.0,
                          Gl_Texture_Image* image = 0);
        Material ();
        Material (const Material& material);
        ~Material ();

        const Material& operator = (const Material& material);

        Gl_Texture_Image* texture_image () { return mp_texture_image; }
        double friction_factor () const { return m_friction_factor; }
        double rolling_resistance_factor () const 
        { return m_rolling_resistance_factor; }
        double drag_factor () const { return m_drag_factor; }
        double restitution_factor () const { return m_restitution_factor; }
        double bump (double distance) const;
        Material_Type type () const { return m_type; }
  };
}

#endif

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