68 lines
2.1 KiB
C++
68 lines
2.1 KiB
C++
// Filename: queryContext.h
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// Created by: drose (27Mar06)
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//
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////////////////////////////////////////////////////////////////////
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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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////////////////////////////////////////////////////////////////////
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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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// Class : QueryContext
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// Description : This is a base class for queries that might require a
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// round-trip to the graphics engine. The idea is that
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// when you ask the GSG to make a particular query, it
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// 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
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// reference-counted. It removes itself from the GSG
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// when the last reference goes away. You're
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// responsible for keeping the pointer to the
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// QueryContext as long as you are interested in the
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// 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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