Panda3D
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queryContext.h
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1/**
2 * PANDA 3D SOFTWARE
3 * Copyright (c) Carnegie Mellon University. All rights reserved.
4 *
5 * All use of this software is subject to the terms of the revised BSD
6 * license. You should have received a copy of this license along
7 * with this source code in a file named "LICENSE."
8 *
9 * @file queryContext.h
10 * @author drose
11 * @date 2006-03-27
12 */
13
14#ifndef QUERYCONTEXT_H
15#define QUERYCONTEXT_H
16
17#include "pandabase.h"
18#include "typedReferenceCount.h"
19
21
22/**
23 * This is a base class for queries that might require a round-trip to the
24 * graphics engine. The idea is that when you ask the GSG to make a
25 * particular query, it returns a QueryContext, which does not necessarily
26 * have the answer right away (but it will eventually).
27 *
28 * Unlike SavedContext, QueryContext is reference-counted. It removes itself
29 * from the GSG when the last reference goes away. You're responsible for
30 * keeping the pointer to the QueryContext as long as you are interested in
31 * the answer.
32 */
33class EXPCL_PANDA_GOBJ QueryContext : public TypedReferenceCount {
34public:
35 INLINE QueryContext();
36 virtual ~QueryContext();
37
38 virtual bool is_answer_ready() const=0;
39 virtual void waiting_for_answer();
40
41public:
42 static TypeHandle get_class_type() {
43 return _type_handle;
44 }
45 static void init_type() {
46 TypedReferenceCount::init_type();
47 register_type(_type_handle, "QueryContext",
48 TypedReferenceCount::get_class_type());
49 }
50 virtual TypeHandle get_type() const {
51 return get_class_type();
52 }
53 virtual TypeHandle force_init_type() {init_type(); return get_class_type();}
54
55private:
56 static TypeHandle _type_handle;
57};
58
59#include "queryContext.I"
60
61#endif
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.
TypeHandle is the identifier used to differentiate C++ class types.
Definition typeHandle.h:81
A base class for things which need to inherit from both TypedObject and from ReferenceCount.
PANDA 3D SOFTWARE Copyright (c) Carnegie Mellon University.
PANDA 3D SOFTWARE Copyright (c) Carnegie Mellon University.
void register_type(TypeHandle &type_handle, const std::string &name)
This inline function is just a convenient way to call TypeRegistry::register_type(),...
PANDA 3D SOFTWARE Copyright (c) Carnegie Mellon University.