panda3d/panda/src/pgraph/renderEffect.I

// Filename: renderEffect.I
// Created by:  drose (14Mar02)
//
////////////////////////////////////////////////////////////////////
//
// PANDA 3D SOFTWARE
// Copyright (c) 2001 - 2004, Disney Enterprises, Inc.  All rights reserved
//
// All use of this software is subject to the terms of the Panda 3d
// Software license.  You should have received a copy of this license
// along with this source code; you will also find a current copy of
// the license at http://etc.cmu.edu/panda3d/docs/license/ .
//
// To contact the maintainers of this program write to
// [email protected] .
//
////////////////////////////////////////////////////////////////////


////////////////////////////////////////////////////////////////////
//     Function: RenderEffect::compare_to
//       Access: Published
//  Description: Provides an arbitrary ordering among all unique
//               RenderEffects, so we can store the essentially
//               different ones in a big set and throw away the rest.
//
//               This method is not needed outside of the RenderEffect
//               class because all equivalent RenderEffect objects are
//               guaranteed to share the same pointer; thus, a pointer
//               comparison is always sufficient.
////////////////////////////////////////////////////////////////////
INLINE int RenderEffect::
compare_to(const RenderEffect &other) const {
  // First, we compare the types; if they are of different types then
  // they sort differently.
  TypeHandle type = get_type();
  TypeHandle other_type = other.get_type();
  if (type != other_type) {
    return type.get_index() - other_type.get_index();
  }

  // We only call compare_to_impl() if they have the same type.
  return compare_to_impl(&other);
}