// Filename: transformTable.I
// Created by:  drose (23Mar05)
//
////////////////////////////////////////////////////////////////////
//
// 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: TransformTable::is_registered
//       Access: Published
//  Description: Returns true if this table has been registered.
//               Once it has been registered, the set of transforms in
//               a TransformTable may not be further modified; but
//               it must be registered before it can be assigned to a
//               Geom.
////////////////////////////////////////////////////////////////////
INLINE bool TransformTable::
is_registered() const {
  return _is_registered;
}

////////////////////////////////////////////////////////////////////
//     Function: TransformTable::register_table
//       Access: Published, Static
//  Description: Registers a TransformTable for use.  This is
//               similar to GeomVertexFormat::register_format().  Once
//               registered, a TransformTable may no longer be
//               modified (although the individual VertexTransform
//               objects may modify their reported transforms).
//
//               This must be called before a table may be used in a
//               Geom.  After this call, you should discard the
//               original pointer you passed in (which may or may not
//               now be invalid) and let its reference count decrement
//               normally; you should use only the returned value from
//               this point on.
////////////////////////////////////////////////////////////////////
INLINE CPT(TransformTable) TransformTable::
register_table(const TransformTable *table) {
  // We don't actually bother adding the table object to a registry.
  // This means there may be multiple copies of identical registered
  // TransformTables.  Big deal.  We can always go back and make a
  // registry later if we really need it.
  if (table->is_registered()) {
    return table;
  }

  ((TransformTable *)table)->do_register();
  return table;
}

////////////////////////////////////////////////////////////////////
//     Function: TransformTable::get_num_transforms
//       Access: Published
//  Description: Returns the number of transforms in the table.
////////////////////////////////////////////////////////////////////
INLINE int TransformTable::
get_num_transforms() const {
  return _transforms.size();
}

////////////////////////////////////////////////////////////////////
//     Function: TransformTable::get_transform
//       Access: Published
//  Description: Returns the nth transform in the table.
////////////////////////////////////////////////////////////////////
INLINE const VertexTransform *TransformTable::
get_transform(int n) const {
  nassertr(n >= 0 && n < (int)_transforms.size(), NULL);
  return _transforms[n];
}

////////////////////////////////////////////////////////////////////
//     Function: TransformTable::get_modified
//       Access: Published
//  Description: Returns a sequence number that's guaranteed to change
//               at least when any VertexTransforms in the table
//               change.  (However, this is only true for a registered
//               table.  An unregistered table may or may not
//               reflect an update here when a VertexTransform
//               changes.)
////////////////////////////////////////////////////////////////////
INLINE UpdateSeq TransformTable::
get_modified(Thread *current_thread) const {
  CDReader cdata(_cycler, current_thread);
  return cdata->_modified;
}

////////////////////////////////////////////////////////////////////
//     Function: TransformTable::update_modified
//       Access: Private
//  Description: Called internally whenever a nested VertexTransform
//               reports that it has been modified.
////////////////////////////////////////////////////////////////////
INLINE void TransformTable::
update_modified(UpdateSeq modified, Thread *current_thread) {
  CDWriter cdata(_cycler, true, current_thread);
  cdata->_modified = modified;
}

////////////////////////////////////////////////////////////////////
//     Function: TransformTable::CData::Constructor
//       Access: Public
//  Description:
////////////////////////////////////////////////////////////////////
INLINE TransformTable::CData::
CData() {
}

////////////////////////////////////////////////////////////////////
//     Function: TransformTable::CData::Copy Constructor
//       Access: Public
//  Description:
////////////////////////////////////////////////////////////////////
INLINE TransformTable::CData::
CData(const TransformTable::CData &copy) :
  _modified(copy._modified)
{
}