616b2bf4f6
Make an OSG file reader for .stg files. New class flightgear::SceneryPager, which is a subclass osg::DatabasePager to handle explicit delete requests. Modify FGNewCache, FGTileEntry, and FGTileManager to use SceneryPager. Mostly this involved removing the queues that talked to FGTileLoader. Calculate accurate tile timestamps from the time they are traversed in the cull stage (which means that they are visible) instead of updating them periodically. Replace tile entry transform and range node with one LOD node
113 lines
4.3 KiB
C++
113 lines
4.3 KiB
C++
// scenery.hxx -- data structures and routines for managing scenery.
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//
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// Written by Curtis Olson, started May 1997.
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//
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// Copyright (C) 1997 Curtis L. Olson - http://www.flightgear.org/~curt
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//
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// This program is free software; you can redistribute it and/or
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// modify it under the terms of the GNU General Public License as
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// published by the Free Software Foundation; either version 2 of the
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// License, or (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful, but
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// WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program; if not, write to the Free Software
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// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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//
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// $Id$
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#ifndef _SCENERY_HXX
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#define _SCENERY_HXX
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#ifndef __cplusplus
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# error This library requires C++
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#endif
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#include <osg/ref_ptr>
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#include <osg/Group>
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#include <simgear/compiler.h>
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#include <simgear/math/SGMath.hxx>
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#include <simgear/structure/subsystem_mgr.hxx>
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#include "SceneryPager.hxx"
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class SGMaterial;
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// Define a structure containing global scenery parameters
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class FGScenery : public SGSubsystem {
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// scene graph
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osg::ref_ptr<osg::Group> scene_graph;
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osg::ref_ptr<osg::Group> terrain_branch;
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osg::ref_ptr<osg::Group> models_branch;
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osg::ref_ptr<osg::Group> aircraft_branch;
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public:
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FGScenery();
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~FGScenery();
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// Implementation of SGSubsystem.
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void init ();
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void bind ();
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void unbind ();
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void update (double dt);
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/// Compute the elevation of the scenery at geodetic latitude lat,
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/// geodetic longitude lon and not higher than max_alt.
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/// If the exact flag is set to true, the scenery center is moved to
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/// gain a higher accuracy of that query. The center is restored past
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/// that to the original value.
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/// The altitude hit is returned in the alt argument.
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/// The method returns true if the scenery is available for the given
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/// lat/lon pair. If there is no scenery for that point, the altitude
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/// value is undefined.
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/// All values are meant to be in meters or degrees.
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bool get_elevation_m(double lat, double lon, double max_alt,
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double& alt, const SGMaterial** material);
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bool get_elevation_m(const SGGeod& geod, double& alt,
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const SGMaterial** material);
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/// Compute the elevation of the scenery beow the cartesian point pos.
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/// you the returned scenery altitude is not higher than the position
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/// pos plus an ofset given with max_altoff.
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/// If the exact flag is set to true, the scenery center is moved to
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/// gain a higher accuracy of that query. The center is restored past
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/// that to the original value.
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/// The altitude hit is returned in the alt argument.
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/// The method returns true if the scenery is available for the given
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/// lat/lon pair. If there is no scenery for that point, the altitude
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/// value is undefined.
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/// All values are meant to be in meters.
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bool get_cart_elevation_m(const SGVec3d& pos, double max_altoff,
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double& radius, const SGMaterial** material);
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/// Compute the nearest intersection point of the line starting from
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/// start going in direction dir with the terrain.
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/// The input and output values should be in cartesian coordinates in the
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/// usual earth centered wgs84 coordiante system. Units are meters.
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/// On success, true is returned.
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bool get_cart_ground_intersection(const SGVec3d& start, const SGVec3d& dir,
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SGVec3d& nearestHit);
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osg::Group *get_scene_graph () const { return scene_graph.get(); }
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osg::Group *get_terrain_branch () const { return terrain_branch.get(); }
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osg::Group *get_models_branch () const { return models_branch.get(); }
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osg::Group *get_aircraft_branch () const { return aircraft_branch.get(); }
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// Static because access to the pager is needed before the rest of
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// the scenery is initialized.
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static flightgear::SceneryPager* getPagerSingleton();
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};
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#endif // _SCENERY_HXX
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