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., 675 Mass Ave, Cambridge, MA 02139, 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) && ENABLE_THREADS
40 # include <simgear/threads/SGQueue.hxx>
41 #endif // ENABLE_THREADS
43 #include "FGTileLoader.hxx"
44 #include "hitlist.hxx"
45 #include "newcache.hxx"
47 #if defined(USE_MEM) || defined(WIN32)
48 # define FG_MEM_COPY(to,from,n) memcpy(to, from, n)
50 # define FG_MEM_COPY(to,from,n) bcopy(from, to, n)
53 SG_USING_STD( queue );
56 // forward declaration
60 class FGDeferredModel;
76 // initialize the cache
77 void initialize_queue();
79 // schedule a tile for loading
80 void sched_tile( const SGBucket& b, const bool is_inner_ring );
82 // schedule a needed buckets for loading
83 void schedule_needed(double visibility_meters, SGBucket curr_bucket);
87 SGBucket previous_bucket;
88 SGBucket current_bucket;
91 FGTileEntry *current_tile;
93 // x and y distance of tiles to load/draw
97 // current longitude latitude
105 FGNewCache tile_cache;
108 * Queue tiles for loading.
115 * attach_queue is the tiles that have been loaded [by the pager]
116 * that can be attached to the scene graph by the render thread.
118 * model_queue is the set of models that need to be loaded by the
119 * primary render thread.
121 #if defined(ENABLE_THREADS) && ENABLE_THREADS
122 static SGLockedQueue<FGTileEntry *> attach_queue;
123 static SGLockedQueue<FGDeferredModel *> model_queue;
125 static queue<FGTileEntry *> attach_queue;
126 static queue<FGDeferredModel *> model_queue;
127 #endif // ENABLE_THREADS
128 static queue<FGTileEntry *> delete_queue;
131 * Tile filter indicator, to implement multipass rendering
133 static bool tile_filter;
138 * Add a loaded tile to the 'attach to the scene graph' queue.
140 static void ready_to_attach( FGTileEntry *t ) { attach_queue.push( t ); }
143 * Add a pending model to the 'deferred model load' queue
145 static void model_ready( FGDeferredModel *dm ) { model_queue.push( dm ); }
155 // Initialize the Tile Manager subsystem
158 // Update the various queues maintained by the tilemagr (private
159 // internal function, do not call directly.)
160 void update_queues();
162 // get state of all the scenery loading queues
163 bool all_queues_empty();
165 // given the current lon/lat (in degrees), fill in the array of
166 // local chunks. If the chunk isn't already in the cache, then
167 // read it from disk.
168 int update( double visibility_meters );
169 int update( SGLocation *location, double visibility_meters);
171 // Prepare the ssg nodes corresponding to each tile. For each
172 // tile, set the ssg transform and update it's range selector
173 // based on current visibilty void prep_ssg_nodes( float
174 // visibility_meters );
175 void prep_ssg_nodes( SGLocation *location, float visibility_meters );
177 // Set flag with event manager so that non-moving view refreshes
179 void refresh_view_timestamps();
181 inline SGBucket get_current_bucket () { return current_bucket; }
182 inline SGBucket get_previous_bucket () { return previous_bucket; }
184 static bool set_tile_filter( bool f );
185 static int tile_filter_cb( ssgEntity *, int );
187 /// Returns true if scenery is avaliable for the given lat, lon position
188 /// within a range of range_m.
189 /// lat and lon are expected to be in degrees.
190 bool scenery_available(double lat, double lon, double range_m);
194 #endif // _TILEMGR_HXX