// Filename: lightAttrib.I
// Created by:  drose (26Mar02)
//
////////////////////////////////////////////////////////////////////
//
// PANDA 3D SOFTWARE
// Copyright (c) Carnegie Mellon University.  All rights reserved.
//
// All use of this software is subject to the terms of the revised BSD
// license.  You should have received a copy of this license along
// with this source code in a file named "LICENSE."
//
////////////////////////////////////////////////////////////////////


////////////////////////////////////////////////////////////////////
//     Function: LightAttrib::Constructor
//       Access: Protected
//  Description: Use LightAttrib::make() to construct a new
//               LightAttrib object.
////////////////////////////////////////////////////////////////////
INLINE LightAttrib::
LightAttrib() {
  _off_all_lights = false;
}

////////////////////////////////////////////////////////////////////
//     Function: LightAttrib::Copy Constructor
//       Access: Protected
//  Description: Use LightAttrib::make() to construct a new
//               LightAttrib object.  The copy constructor is only
//               defined to facilitate methods like add_on_light().
////////////////////////////////////////////////////////////////////
INLINE LightAttrib::
LightAttrib(const LightAttrib &copy) :
  _on_lights(copy._on_lights),
  _off_lights(copy._off_lights),
  _off_all_lights(copy._off_all_lights)
{
}

////////////////////////////////////////////////////////////////////
//     Function: LightAttrib::get_num_on_lights
//       Access: Published
//  Description: Returns the number of lights that are turned on by
//               the attribute.
////////////////////////////////////////////////////////////////////
INLINE int LightAttrib::
get_num_on_lights() const {
  return _on_lights.size();
}

////////////////////////////////////////////////////////////////////
//     Function: LightAttrib::get_on_light
//       Access: Published
//  Description: Returns the nth light turned on by the attribute,
//               sorted in render order.
////////////////////////////////////////////////////////////////////
INLINE NodePath LightAttrib::
get_on_light(int n) const {
  nassertr(n >= 0 && n < (int)_on_lights.size(), NodePath::fail());
  return _on_lights[n];
}

////////////////////////////////////////////////////////////////////
//     Function: LightAttrib::has_on_light
//       Access: Published
//  Description: Returns true if the indicated light is turned on by
//               the attrib, false otherwise.
////////////////////////////////////////////////////////////////////
INLINE bool LightAttrib::
has_on_light(const NodePath &light) const {
  return _on_lights.find(light) != _on_lights.end();
}

////////////////////////////////////////////////////////////////////
//     Function: LightAttrib::get_num_off_lights
//       Access: Published
//  Description: Returns the number of lights that are turned off by
//               the attribute.
////////////////////////////////////////////////////////////////////
INLINE int LightAttrib::
get_num_off_lights() const {
  return _off_lights.size();
}

////////////////////////////////////////////////////////////////////
//     Function: LightAttrib::get_off_light
//       Access: Published
//  Description: Returns the nth light turned off by the attribute,
//               sorted in arbitrary (pointer) order.
////////////////////////////////////////////////////////////////////
INLINE NodePath LightAttrib::
get_off_light(int n) const {
  nassertr(n >= 0 && n < (int)_off_lights.size(), NodePath::fail());
  return _off_lights[n];
}

////////////////////////////////////////////////////////////////////
//     Function: LightAttrib::has_off_light
//       Access: Published
//  Description: Returns true if the indicated light is turned off by
//               the attrib, false otherwise.
////////////////////////////////////////////////////////////////////
INLINE bool LightAttrib::
has_off_light(const NodePath &light) const {
  return _off_lights.find(light) != _off_lights.end() ||
    (_off_all_lights && !has_on_light(light));
}

////////////////////////////////////////////////////////////////////
//     Function: LightAttrib::has_all_off
//       Access: Published
//  Description: Returns true if this attrib turns off all lights
//               (although it may also turn some on).
////////////////////////////////////////////////////////////////////
INLINE bool LightAttrib::
has_all_off() const {
  return _off_all_lights;
}

////////////////////////////////////////////////////////////////////
//     Function: LightAttrib::is_identity
//       Access: Published
//  Description: Returns true if this is an identity attrib: it does
//               not change the set of lights in use.
////////////////////////////////////////////////////////////////////
INLINE bool LightAttrib::
is_identity() const {
  return _on_lights.empty() && _off_lights.empty() && !_off_all_lights;
}

////////////////////////////////////////////////////////////////////
//     Function: LightAttrib::check_filtered
//       Access: Private
//  Description: Confirms whether the _filtered table is still valid.
//               It may become invalid if someone calls
//               Light::set_priority().
//
//               If the table is invalid, transparently empties it
//               before returning.
////////////////////////////////////////////////////////////////////
INLINE void LightAttrib::
check_filtered() const {
  if (_sort_seq != Light::get_sort_seq()) {
    ((LightAttrib *)this)->sort_on_lights();
  }
}