text: /*
      Copyright (c) 2005-2018 Intel Corporation
  
      Licensed under the Apache License, Version 2.0 (the "License");
      you may not use this file except in compliance with the License.
      You may obtain a copy of the License at
  
          http://www.apache.org/licenses/LICENSE-2.0
  
      Unless required by applicable law or agreed to in writing, software
      distributed under the License is distributed on an "AS IS" BASIS,
      WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
      See the License for the specific language governing permissions and
      limitations under the License.
  
  
  
  
  */
  
  /*
      The original source for this example is
      Copyright (c) 1994-2008 John E. Stone
      All rights reserved.
  
      Redistribution and use in source and binary forms, with or without
      modification, are permitted provided that the following conditions
      are met:
      1. Redistributions of source code must retain the above copyright
         notice, this list of conditions and the following disclaimer.
      2. Redistributions in binary form must reproduce the above copyright
         notice, this list of conditions and the following disclaimer in the
         documentation and/or other materials provided with the distribution.
      3. The name of the author may not be used to endorse or promote products
         derived from this software without specific prior written permission.
  
      THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
      OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
      WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
      ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
      DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
      DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
      OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
      HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
      LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
      OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
      SUCH DAMAGE.
  */
  
  /* 
   * light.h - this file includes declarations and defines for light sources.
   *
   *  $Id: light.h,v 1.2 2007-02-22 17:54:15 Exp $
   */
  
  typedef struct {
    unsigned int id;                      /* Unique Object serial number    */
    void * nextobj;                       /* pointer to next object in list */
    object_methods * methods;             /* this object's methods          */
    texture * tex;                        /* object texture                 */
    vector ctr;
    flt rad;
  } point_light; 
  
  point_light * newlight(void *, vector, flt);
  
  #ifdef LIGHT_PRIVATE
  static int light_bbox(void * obj, vector * min, vector * max);
  static void light_intersect(point_light *, ray *);
  static void light_normal(point_light *, vector *, ray *, vector *);
  #endif
  