1 // tilemgr.hxx -- routines to handle dynamic management of scenery tiles
3 // Written by Curtis Olson, started January 1998.
5 // Copyright (C) 1997 Curtis L. Olson - http://www.flightgear.org/~curt
7 // This program is free software; you can redistribute it and/or
8 // modify it under the terms of the GNU General Public License as
9 // published by the Free Software Foundation; either version 2 of the
10 // License, or (at your option) any later version.
12 // This program is distributed in the hope that it will be useful, but
13 // WITHOUT ANY WARRANTY; without even the implied warranty of
14 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 // General Public License for more details.
17 // You should have received a copy of the GNU General Public License
18 // along with this program; if not, write to the Free Software
19 // Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
29 # error This library requires C++
32 #include <simgear/compiler.h>
33 #include <simgear/math/point3d.hxx>
34 #include <simgear/scene/model/location.hxx>
38 #include <simgear/bucket/newbucket.hxx>
39 #if defined(ENABLE_THREADS)
40 # include <simgear/threads/SGQueue.hxx>
41 #endif // ENABLE_THREADS
43 #include "FGTileLoader.hxx"
44 #include "newcache.hxx"
46 #if defined(USE_MEM) || defined(WIN32)
47 # define FG_MEM_COPY(to,from,n) memcpy(to, from, n)
49 # define FG_MEM_COPY(to,from,n) bcopy(from, to, n)
52 SG_USING_STD( queue );
55 // forward declaration
57 class FGDeferredModel;
74 // initialize the cache
75 void initialize_queue();
77 // schedule a tile for loading
78 void sched_tile( const SGBucket& b, const bool is_inner_ring );
80 // schedule a needed buckets for loading
81 void schedule_needed(double visibility_meters, const SGBucket& curr_bucket);
83 SGBucket previous_bucket;
84 SGBucket current_bucket;
87 FGTileEntry *current_tile;
89 // x and y distance of tiles to load/draw
93 // current longitude latitude
101 FGNewCache tile_cache;
104 * Queue tiles for loading.
111 * attach_queue is the tiles that have been loaded [by the pager]
112 * that can be attached to the scene graph by the render thread.
114 * model_queue is the set of models that need to be loaded by the
115 * primary render thread.
117 #if defined(ENABLE_THREADS)
118 static SGLockedQueue<FGTileEntry *> attach_queue;
119 static SGLockedQueue<FGDeferredModel *> model_queue;
121 static queue<FGTileEntry *> attach_queue;
122 static queue<FGDeferredModel *> model_queue;
123 #endif // ENABLE_THREADS
124 static queue<FGTileEntry *> delete_queue;
129 * Add a loaded tile to the 'attach to the scene graph' queue.
131 static void ready_to_attach( FGTileEntry *t ) { attach_queue.push( t ); }
134 * Add a pending model to the 'deferred model load' queue
136 static void model_ready( FGDeferredModel *dm ) { model_queue.push( dm ); }
146 // Initialize the Tile Manager subsystem
149 // Update the various queues maintained by the tilemagr (private
150 // internal function, do not call directly.)
151 void update_queues();
153 // get state of all the scenery loading queues
154 bool all_queues_empty();
156 // given the current lon/lat (in degrees), fill in the array of
157 // local chunks. If the chunk isn't already in the cache, then
158 // read it from disk.
159 int update( double visibility_meters );
160 int update( SGLocation *location, double visibility_meters);
162 // Prepare the ssg nodes corresponding to each tile. For each
163 // tile, set the ssg transform and update it's range selector
164 // based on current visibilty void prep_ssg_nodes( float
165 // visibility_meters );
166 void prep_ssg_nodes(float visibility_meters );
168 // Set flag with event manager so that non-moving view refreshes
170 void refresh_view_timestamps();
172 const SGBucket& get_current_bucket () const { return current_bucket; }
174 /// Returns true if scenery is avaliable for the given lat, lon position
175 /// within a range of range_m.
176 /// lat and lon are expected to be in degrees.
177 bool scenery_available(double lat, double lon, double range_m);
179 // Load a model for a tile
180 static osg::Node* loadTileModel(const string& modelPath, bool cacheModel);
184 #endif // _TILEMGR_HXX