Light.h

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/* This file is part of the Zenipex Library (zenilib).
 * Copyright (C) 2011 Mitchell Keith Bloch (bazald).
 *
 * zenilib is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * zenilib 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 Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with zenilib.  If not, see <http://www.gnu.org/licenses/>.
 */

#ifndef ZENI_LIGHT_H
#define ZENI_LIGHT_H

#include <Zeni/Color.h>
#include <Zeni/Coordinate.h>
#include <Zeni/Vector3f.h>

#ifndef DISABLE_GL
#if defined(REQUIRE_GL_ES)
#include <GLES/gl.h>
#else
#include <GL/glew.h>
#endif
#endif

namespace Zeni {
  
  class Video_GL_Fixed;
  class Video_GL_Shader;
  class Video_DX9;

  enum LIGHT_TYPE {LIGHT_POINT = 1, LIGHT_SPOT = 2, LIGHT_DIRECTIONAL = 3};

  struct ZENI_GRAPHICS_DLL Light {
    Light(const Color &ambient = Color(1.0f, 0.0f, 0.0f, 0.0f), 
      const Color &diffuse = Color(1.0f, 1.0f, 1.0f, 1.0f), 
      const Color &specular = Color(1.0f, 1.0f, 1.0f, 1.0f), 
      const Point3f &position = Point3f(0.0f, 0.0f, 0.0f), 
      const Vector3f &spot_direction = Vector3f(0.0f, 0.0f, -1.0f));

    // Helpers
    inline void set_light_type(const LIGHT_TYPE &light_type); 
    inline void set_spot_theta(const float &spot_theta); 
    inline void set_spot_phi(const float &spot_phi); 
    
#ifndef DISABLE_GL_FIXED
    void set(const GLenum &number, Video_GL_Fixed &screen) const;
#endif

#ifndef DISABLE_GL_SHADER
    void set(const GLenum &number, Video_GL_Shader &screen) const;
#endif

#ifndef DISABLE_DX9
    void set(const DWORD &number, Video_DX9 &screen) const;
#endif

    LIGHT_TYPE light_type; 
    Color diffuse; 
    Color specular; 
    Color ambient; 
    Point3f position; 
    Point3f spot_direction; 
    float range; 
    float spot_exponent; 
    float constant_attenuation; 
    float linear_attenuation; 
    float quadratic_attenuation; 
    float spot_theta; 
    float spot_phi; 
  };

}

#endif