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;
73 // initialize the cache
74 void initialize_queue();
76 // schedule a tile for loading
77 void sched_tile( const SGBucket& b, const bool is_inner_ring );
79 // schedule a needed buckets for loading
80 void schedule_needed(double visibility_meters, const SGBucket& curr_bucket);
82 SGBucket previous_bucket;
83 SGBucket current_bucket;
86 FGTileEntry *current_tile;
88 // x and y distance of tiles to load/draw
92 // current longitude latitude
100 FGNewCache tile_cache;
103 * Queue tiles for loading.
110 * attach_queue is the tiles that have been loaded [by the pager]
111 * that can be attached to the scene graph by the render thread.
113 * model_queue is the set of models that need to be loaded by the
114 * primary render thread.
116 #if defined(ENABLE_THREADS)
117 static SGLockedQueue<FGTileEntry *> attach_queue;
118 static SGLockedQueue<FGDeferredModel *> model_queue;
120 static queue<FGTileEntry *> attach_queue;
121 static queue<FGDeferredModel *> model_queue;
122 #endif // ENABLE_THREADS
123 static queue<FGTileEntry *> delete_queue;
126 * Tile filter indicator, to implement multipass rendering
128 static bool tile_filter;
133 * Add a loaded tile to the 'attach to the scene graph' queue.
135 static void ready_to_attach( FGTileEntry *t ) { attach_queue.push( t ); }
138 * Add a pending model to the 'deferred model load' queue
140 static void model_ready( FGDeferredModel *dm ) { model_queue.push( dm ); }
150 // Initialize the Tile Manager subsystem
153 // Update the various queues maintained by the tilemagr (private
154 // internal function, do not call directly.)
155 void update_queues();
157 // get state of all the scenery loading queues
158 bool all_queues_empty();
160 // given the current lon/lat (in degrees), fill in the array of
161 // local chunks. If the chunk isn't already in the cache, then
162 // read it from disk.
163 int update( double visibility_meters );
164 int update( SGLocation *location, double visibility_meters);
166 // Prepare the ssg nodes corresponding to each tile. For each
167 // tile, set the ssg transform and update it's range selector
168 // based on current visibilty void prep_ssg_nodes( float
169 // visibility_meters );
170 void prep_ssg_nodes(float visibility_meters );
172 // Set flag with event manager so that non-moving view refreshes
174 void refresh_view_timestamps();
176 const SGBucket& get_current_bucket () const { return current_bucket; }
178 static bool set_tile_filter( bool f );
180 /// Returns true if scenery is avaliable for the given lat, lon position
181 /// within a range of range_m.
182 /// lat and lon are expected to be in degrees.
183 bool scenery_available(double lat, double lon, double range_m);
187 #endif // _TILEMGR_HXX