72 lines
2.3 KiB
C++
72 lines
2.3 KiB
C++
// Filename: queryContext.h
|
|
// Created by: drose (27Mar06)
|
|
//
|
|
////////////////////////////////////////////////////////////////////
|
|
//
|
|
// PANDA 3D SOFTWARE
|
|
// Copyright (c) 2001 - 2004, Disney Enterprises, Inc. All rights reserved
|
|
//
|
|
// All use of this software is subject to the terms of the Panda 3d
|
|
// Software license. You should have received a copy of this license
|
|
// along with this source code; you will also find a current copy of
|
|
// the license at http://etc.cmu.edu/panda3d/docs/license/ .
|
|
//
|
|
// To contact the maintainers of this program write to
|
|
// panda3d-general@lists.sourceforge.net .
|
|
//
|
|
////////////////////////////////////////////////////////////////////
|
|
|
|
#ifndef QUERYCONTEXT_H
|
|
#define QUERYCONTEXT_H
|
|
|
|
#include "pandabase.h"
|
|
#include "typedReferenceCount.h"
|
|
|
|
class PreparedGraphicsObjects;
|
|
|
|
////////////////////////////////////////////////////////////////////
|
|
// Class : QueryContext
|
|
// Description : This is a base class for queries that might require a
|
|
// round-trip to the graphics engine. The idea is that
|
|
// when you ask the GSG to make a particular query, it
|
|
// returns a QueryContext, which does not necessarily
|
|
// have the answer right away (but it will eventually).
|
|
//
|
|
// Unlike SavedContext, QueryContext is
|
|
// reference-counted. It removes itself from the GSG
|
|
// when the last reference goes away. You're
|
|
// responsible for keeping the pointer to the
|
|
// QueryContext as long as you are interested in the
|
|
// answer.
|
|
////////////////////////////////////////////////////////////////////
|
|
class EXPCL_PANDA QueryContext : public TypedReferenceCount {
|
|
public:
|
|
INLINE QueryContext();
|
|
virtual ~QueryContext();
|
|
|
|
virtual bool is_answer_ready() const=0;
|
|
virtual void waiting_for_answer();
|
|
|
|
public:
|
|
static TypeHandle get_class_type() {
|
|
return _type_handle;
|
|
}
|
|
static void init_type() {
|
|
TypedReferenceCount::init_type();
|
|
register_type(_type_handle, "QueryContext",
|
|
TypedReferenceCount::get_class_type());
|
|
}
|
|
virtual TypeHandle get_type() const {
|
|
return get_class_type();
|
|
}
|
|
virtual TypeHandle force_init_type() {init_type(); return get_class_type();}
|
|
|
|
private:
|
|
static TypeHandle _type_handle;
|
|
};
|
|
|
|
#include "queryContext.I"
|
|
|
|
#endif
|
|
|