Panda3D
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00001 // Filename: geomContext.h 00002 // Created by: drose (19Mar04) 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 #ifndef GEOMCONTEXT_H 00016 #define GEOMCONTEXT_H 00017 00018 #include "pandabase.h" 00019 00020 #include "savedContext.h" 00021 #include "geom.h" 00022 00023 //////////////////////////////////////////////////////////////////// 00024 // Class : GeomContext 00025 // Description : This is a special class object that holds all the 00026 // information returned by a particular GSG to indicate 00027 // the geom's internal context identifier. 00028 // 00029 // Geoms typically have an immediate-mode and a 00030 // retained-mode operation. When using geoms in 00031 // retained-mode (in response to Geom::prepare()), 00032 // the GSG will create some internal handle for the 00033 // geom and store it here. The geom stores all of 00034 // these handles internally. 00035 // 00036 // In the case of OpenGL, for example, a GeomContext 00037 // corresponds to a display list identifier. 00038 //////////////////////////////////////////////////////////////////// 00039 class EXPCL_PANDA_GOBJ GeomContext : public SavedContext { 00040 public: 00041 INLINE GeomContext(Geom *geom); 00042 00043 PUBLISHED: 00044 INLINE Geom *get_geom() const; 00045 00046 public: 00047 // This cannot be a PT(Geom), because the geom and the GSG 00048 // both own their GeomContexts! That would create a circular 00049 // reference count. 00050 Geom *_geom; 00051 00052 public: 00053 static TypeHandle get_class_type() { 00054 return _type_handle; 00055 } 00056 static void init_type() { 00057 SavedContext::init_type(); 00058 register_type(_type_handle, "GeomContext", 00059 SavedContext::get_class_type()); 00060 } 00061 virtual TypeHandle get_type() const { 00062 return get_class_type(); 00063 } 00064 virtual TypeHandle force_init_type() {init_type(); return get_class_type();} 00065 00066 private: 00067 static TypeHandle _type_handle; 00068 }; 00069 00070 #include "geomContext.I" 00071 00072 #endif 00073