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occlusionQueryContext.h
1 // Filename: occlusionQueryContext.h
2 // Created by: drose (27Mar06)
3 //
4 ////////////////////////////////////////////////////////////////////
5 //
6 // PANDA 3D SOFTWARE
7 // Copyright (c) Carnegie Mellon University. All rights reserved.
8 //
9 // All use of this software is subject to the terms of the revised BSD
10 // license. You should have received a copy of this license along
11 // with this source code in a file named "LICENSE."
12 //
13 ////////////////////////////////////////////////////////////////////
14 
15 #ifndef OCCLUSIONQUERYCONTEXT_H
16 #define OCCLUSIONQUERYCONTEXT_H
17 
18 #include "pandabase.h"
19 #include "queryContext.h"
20 
21 ////////////////////////////////////////////////////////////////////
22 // Class : OcclusionQueryContext
23 // Description : Returned from a GSG in response to
24 // begin_occlusion_query() .. end_occlusion_query(),
25 // this records the number of fragments (pixels) that
26 // passed the depth test between the bracketing calls.
27 ////////////////////////////////////////////////////////////////////
28 class EXPCL_PANDA_GOBJ OcclusionQueryContext : public QueryContext {
29 public:
30  INLINE OcclusionQueryContext();
31 
32  virtual int get_num_fragments() const=0;
33 
34 public:
35  static TypeHandle get_class_type() {
36  return _type_handle;
37  }
38  static void init_type() {
39  QueryContext::init_type();
40  register_type(_type_handle, "OcclusionQueryContext",
41  QueryContext::get_class_type());
42  }
43  virtual TypeHandle get_type() const {
44  return get_class_type();
45  }
46  virtual TypeHandle force_init_type() {init_type(); return get_class_type();}
47 
48 private:
49  static TypeHandle _type_handle;
50 
51  friend class PreparedGraphicsObjects;
52 };
53 
54 #include "occlusionQueryContext.I"
55 
56 #endif
57 
A table of objects that are saved within the graphics context for reference by handle later...
This is a base class for queries that might require a round-trip to the graphics engine.
Definition: queryContext.h:38
Returned from a GSG in response to begin_occlusion_query() .
TypeHandle is the identifier used to differentiate C++ class types.
Definition: typeHandle.h:85