// Filename: cullableObject.I
// Created by:  drose (04Mar02)
//
////////////////////////////////////////////////////////////////////
//
// 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: CullableObject::Constructor
//       Access: Public
//  Description: Creates an empty CullableObject whose pointers can be
//               filled in later.
////////////////////////////////////////////////////////////////////
INLINE CullableObject::
CullableObject() :
  _fancy(false)
{
}

////////////////////////////////////////////////////////////////////
//     Function: CullableObject::Constructor
//       Access: Public
//  Description: Creates a CullableObject based the indicated geom,
//               with the indicated render state and transform.
////////////////////////////////////////////////////////////////////
INLINE CullableObject::
CullableObject(const Geom *geom, const RenderState *state,
               const TransformState *net_transform,
               const TransformState *modelview_transform,
               const GraphicsStateGuardianBase *gsg) :
  _geom(geom),
  _state(state),
  _net_transform(net_transform),
  _modelview_transform(modelview_transform),
  _internal_transform(gsg->get_cs_transform()->compose(modelview_transform)),
  _fancy(false)
{
}

////////////////////////////////////////////////////////////////////
//     Function: CullableObject::Constructor
//       Access: Public
//  Description: Creates a CullableObject based the indicated geom,
//               with the indicated render state and transform.
////////////////////////////////////////////////////////////////////
INLINE CullableObject::
CullableObject(const Geom *geom, const RenderState *state,
               const TransformState *net_transform,
               const TransformState *modelview_transform,
               const TransformState *internal_transform) :
  _geom(geom),
  _state(state),
  _net_transform(net_transform),
  _modelview_transform(modelview_transform),
  _internal_transform(internal_transform),
  _fancy(false)
{
}
  

////////////////////////////////////////////////////////////////////
//     Function: CullableObject::Copy Constructor
//       Access: Public
//  Description: Copies the CullableObject, but does not copy its
//               children (decals).
////////////////////////////////////////////////////////////////////
INLINE CullableObject::
CullableObject(const CullableObject &copy) :
  _geom(copy._geom),
  _munger(copy._munger),
  _munged_data(copy._munged_data),
  _state(copy._state),
  _net_transform(copy._net_transform),
  _modelview_transform(copy._modelview_transform),
  _internal_transform(copy._internal_transform),
  _fancy(false)
{
}

////////////////////////////////////////////////////////////////////
//     Function: CullableObject::Copy Assignment Operator
//       Access: Public
//  Description: Copies the CullableObject, but does not copy its
//               children (decals).
////////////////////////////////////////////////////////////////////
INLINE void CullableObject::
operator = (const CullableObject &copy) {
  nassertv(!_fancy);
  _geom = copy._geom;
  _munger = copy._munger;
  _munged_data = copy._munged_data;
  _state = copy._state;
  _net_transform = copy._net_transform;
  _modelview_transform = copy._modelview_transform;
  _internal_transform = copy._internal_transform;
}

////////////////////////////////////////////////////////////////////
//     Function: CullableObject::is_fancy
//       Access: Public
//  Description: Returns true if the object has something fancy to it:
//               decals, maybe, or a draw_callback, that prevents it
//               from being rendered inline.
////////////////////////////////////////////////////////////////////
INLINE bool CullableObject::
is_fancy() const {
  return _fancy;
}

////////////////////////////////////////////////////////////////////
//     Function: CullableObject::has_decals
//       Access: Public
//  Description: Returns true if the object has decals associated with
//               it.
////////////////////////////////////////////////////////////////////
INLINE bool CullableObject::
has_decals() const {
  return _fancy && (_next != (CullableObject *)NULL);
}

////////////////////////////////////////////////////////////////////
//     Function: CullableObject::draw
//       Access: Public
//  Description: Draws the cullable object on the GSG immediately, in
//               the GSG's current state.  This should only be called
//               from the draw thread.
////////////////////////////////////////////////////////////////////
INLINE void CullableObject::
draw(GraphicsStateGuardianBase *gsg, bool force, Thread *current_thread) {
  if (_fancy) {
    draw_fancy(gsg, force, current_thread);
  } else {
    nassertv(_geom != (Geom *)NULL);
    gsg->set_state_and_transform(_state, _internal_transform);
    draw_inline(gsg, force, current_thread);
  }
}

////////////////////////////////////////////////////////////////////
//     Function: CullableObject::request_resident
//       Access: Public
//  Description: Returns true if all the data necessary to render this
//               object is currently resident in memory.  If this
//               returns false, the data will be brought back into
//               memory shortly; try again later.
////////////////////////////////////////////////////////////////////
INLINE bool CullableObject::
request_resident() const {
  bool resident = true;
  if (!_geom->request_resident()) {
    resident = false;
  }
  if (!_munged_data->request_resident()) {
    resident = false;
  }
  return resident;
}


////////////////////////////////////////////////////////////////////
//     Function: CullableObject::set_draw_callback
//       Access: Public
//  Description: Specifies a CallbackObject that will be responsible
//               for drawing this object.
////////////////////////////////////////////////////////////////////
INLINE void CullableObject::
set_draw_callback(CallbackObject *draw_callback) {
  make_fancy();
  if (draw_callback != _draw_callback) {
    if (_draw_callback != (CallbackObject *)NULL) {
      unref_delete(_draw_callback);
    }
    _draw_callback = draw_callback;
    if (_draw_callback != (CallbackObject *)NULL) {
      _draw_callback->ref();
    }
  }
}

////////////////////////////////////////////////////////////////////
//     Function: CullableObject::set_next
//       Access: Public
//  Description: Sets the next object in the decal chain.  This next
//               object will be destructed when this object destructs.
////////////////////////////////////////////////////////////////////
INLINE void CullableObject::
set_next(CullableObject *next) {
  make_fancy();
  nassertv(_next == (CullableObject *)NULL);
  _next = next;
}

////////////////////////////////////////////////////////////////////
//     Function: CullableObject::get_next
//       Access: Public
//  Description: Returns the next object in the decal chain, or NULL
//               for the end of the chain.
////////////////////////////////////////////////////////////////////
INLINE CullableObject *CullableObject::
get_next() const {
  if (_fancy) {
    return _next;
  }
  return NULL;
}

////////////////////////////////////////////////////////////////////
//     Function: CullableObject::flush_level
//       Access: Public, Static
//  Description: Flushes the PStatCollectors used during traversal.
////////////////////////////////////////////////////////////////////
INLINE void CullableObject::
flush_level() {
  _sw_sprites_pcollector.flush_level();
}

////////////////////////////////////////////////////////////////////
//     Function: CullableObject::make_fancy
//       Access: Private
//  Description: Elevates this object to "fancy" status.  This means
//               that the additional pointers, like _next and
//               _draw_callback, have meaningful values and should be
//               examined.
////////////////////////////////////////////////////////////////////
INLINE void CullableObject::
make_fancy() {
  if (!_fancy) {
    _fancy = true;
    _draw_callback = NULL;
    _next = NULL;
  }
}

////////////////////////////////////////////////////////////////////
//     Function: CullableObject::draw_inline
//       Access: Private
//  Description: Draws the cullable object on the GSG immediately, in
//               the GSG's current state.  This should only be called
//               from the draw thread.  Assumes the GSG has already
//               been set to the appropriate state.
////////////////////////////////////////////////////////////////////
INLINE void CullableObject::
draw_inline(GraphicsStateGuardianBase *gsg, bool force, Thread *current_thread) {
  _geom->draw(gsg, _munger, _munged_data, force, current_thread);
}

////////////////////////////////////////////////////////////////////
//     Function: CullableObject::SortPoints::Constructor
//       Access: Public
//  Description: 
////////////////////////////////////////////////////////////////////
INLINE CullableObject::SortPoints::
SortPoints(const CullableObject::PointData *array) :
  _array(array)
{
}

////////////////////////////////////////////////////////////////////
//     Function: CullableObject::SortPoints::operator ()
//       Access: Public
//  Description: Orders the points from back-to-front for correct
//               transparency sorting in munge_points_to_quads
////////////////////////////////////////////////////////////////////
INLINE bool CullableObject::SortPoints::
operator () (unsigned short a, unsigned short b) const {
  return _array[a]._dist > _array[b]._dist;
}

////////////////////////////////////////////////////////////////////
//     Function: CullableObject::SourceFormat::operator <
//       Access: Public
//  Description: 
////////////////////////////////////////////////////////////////////
INLINE bool CullableObject::SourceFormat::
operator < (const CullableObject::SourceFormat &other) const {
  if (_format != other._format) {
    return _format < other._format;
  }
  if (_sprite_texcoord != other._sprite_texcoord) {
    return (int)_sprite_texcoord < (int)other._sprite_texcoord;
  }
  if (_retransform_sprites != other._retransform_sprites) {
    return (int)_retransform_sprites < (int)other._retransform_sprites;
  }
  return false;
}