62 lines
1.7 KiB
C
62 lines
1.7 KiB
C
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/**
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* PANDA 3D SOFTWARE
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* Copyright (c) Carnegie Mellon University. All rights reserved.
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*
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* All use of this software is subject to the terms of the revised BSD
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* license. You should have received a copy of this license along
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* with this source code in a file named "LICENSE."
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*
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* @file queryContext.h
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* @author drose
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* @date 2006-03-27
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*/
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#ifndef QUERYCONTEXT_H
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#define QUERYCONTEXT_H
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#include "pandabase.h"
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#include "typedReferenceCount.h"
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class PreparedGraphicsObjects;
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/**
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* This is a base class for queries that might require a round-trip to the
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* graphics engine. The idea is that when you ask the GSG to make a
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* particular query, it returns a QueryContext, which does not necessarily
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* have the answer right away (but it will eventually).
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*
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* Unlike SavedContext, QueryContext is reference-counted. It removes itself
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* from the GSG when the last reference goes away. You're responsible for
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* keeping the pointer to the QueryContext as long as you are interested in
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* the answer.
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*/
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class EXPCL_PANDA_GOBJ QueryContext : public TypedReferenceCount {
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public:
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INLINE QueryContext();
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virtual ~QueryContext();
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virtual bool is_answer_ready() const=0;
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virtual void waiting_for_answer();
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public:
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static TypeHandle get_class_type() {
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return _type_handle;
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}
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static void init_type() {
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TypedReferenceCount::init_type();
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register_type(_type_handle, "QueryContext",
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TypedReferenceCount::get_class_type());
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}
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virtual TypeHandle get_type() const {
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return get_class_type();
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}
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virtual TypeHandle force_init_type() {init_type(); return get_class_type();}
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private:
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static TypeHandle _type_handle;
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};
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#include "queryContext.I"
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#endif
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