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sglSpotLight.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: sglSpotLight.hpp
 *   Author: Scott McMillan
 *  Created: 9 December 2000
 *  Summary: a positional light subclass with spot characteristics
 *****************************************************************************/

#ifndef __SGL_SPOT_LIGHT_HPP
#define __SGL_SPOT_LIGHT_HPP

#include <sgl.h>
#include <sglPositionalLight.hpp>

class SGL_DLL_API sglSpotLight : public sglPositionalLight
{
public:
   sglSpotLight();
   virtual ~sglSpotLight();

   void setDirection(const sglVec3f &dir);

   const sglVec3f &getDirection() const { return m_direction; }

   void setCutoff(float cutoff);  // in radians

   float getCutoff() const { return m_cutoff; }

   void setExponent(float exponent);

   float getExponent() const { return m_exponent; }

   // See sglLight::setup() for details.
   virtual void setup(GLenum gl_light_number) 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:
   void copyTo(sglSpotLight *dst, unsigned int mode) const;

private: // methods - not implemented
   sglSpotLight(const sglLight &);
   sglSpotLight &operator=(const sglSpotLight &);

protected: // variables
   sglVec3f m_direction;
   float    m_exponent;
   float    m_cutoff;
};

#endif

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