Panda3D
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00001 // Filename: renderEffect.I 00002 // Created by: drose (14Mar02) 00003 // 00004 //////////////////////////////////////////////////////////////////// 00005 // 00006 // PANDA 3D SOFTWARE 00007 // Copyright (c) Carnegie Mellon University. All rights reserved. 00008 // 00009 // All use of this software is subject to the terms of the revised BSD 00010 // license. You should have received a copy of this license along 00011 // with this source code in a file named "LICENSE." 00012 // 00013 //////////////////////////////////////////////////////////////////// 00014 00015 00016 //////////////////////////////////////////////////////////////////// 00017 // Function: RenderEffect::compare_to 00018 // Access: Published 00019 // Description: Provides an arbitrary ordering among all unique 00020 // RenderEffects, so we can store the essentially 00021 // different ones in a big set and throw away the rest. 00022 // 00023 // This method is not needed outside of the RenderEffect 00024 // class because all equivalent RenderEffect objects are 00025 // guaranteed to share the same pointer; thus, a pointer 00026 // comparison is always sufficient. 00027 //////////////////////////////////////////////////////////////////// 00028 INLINE int RenderEffect:: 00029 compare_to(const RenderEffect &other) const { 00030 // First, we compare the types; if they are of different types then 00031 // they sort differently. 00032 TypeHandle type = get_type(); 00033 TypeHandle other_type = other.get_type(); 00034 if (type != other_type) { 00035 return type.get_index() - other_type.get_index(); 00036 } 00037 00038 // We only call compare_to_impl() if they have the same type. 00039 return compare_to_impl(&other); 00040 }