Panda3D
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occlusionQueryContext.h
00001 // Filename: occlusionQueryContext.h
00002 // Created by:  drose (27Mar06)
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 OCCLUSIONQUERYCONTEXT_H
00016 #define OCCLUSIONQUERYCONTEXT_H
00017 
00018 #include "pandabase.h"
00019 #include "queryContext.h"
00020 
00021 ////////////////////////////////////////////////////////////////////
00022 //       Class : OcclusionQueryContext
00023 // Description : Returned from a GSG in response to
00024 //               begin_occlusion_query() .. end_occlusion_query(),
00025 //               this records the number of fragments (pixels) that
00026 //               passed the depth test between the bracketing calls.
00027 ////////////////////////////////////////////////////////////////////
00028 class EXPCL_PANDA_GOBJ OcclusionQueryContext : public QueryContext {
00029 public:
00030   INLINE OcclusionQueryContext();
00031 
00032   virtual int get_num_fragments() const=0;
00033   
00034 public:
00035   static TypeHandle get_class_type() {
00036     return _type_handle;
00037   }
00038   static void init_type() {
00039     QueryContext::init_type();
00040     register_type(_type_handle, "OcclusionQueryContext",
00041                   QueryContext::get_class_type());
00042   }
00043   virtual TypeHandle get_type() const {
00044     return get_class_type();
00045   }
00046   virtual TypeHandle force_init_type() {init_type(); return get_class_type();}
00047 
00048 private:
00049   static TypeHandle _type_handle;
00050 
00051   friend class PreparedGraphicsObjects;
00052 };
00053 
00054 #include "occlusionQueryContext.I"
00055 
00056 #endif
00057 
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