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;
109 Point3D current_center;
112 * Queue tiles for loading.
119 * attach_queue is the tiles that have been loaded [by the pager]
120 * that can be attached to the scene graph by the render thread.
122 * model_queue is the set of models that need to be loaded by the
123 * primary render thread.
125 #if defined(ENABLE_THREADS) && ENABLE_THREADS
126 static SGLockedQueue<FGTileEntry *> attach_queue;
127 static SGLockedQueue<FGDeferredModel *> model_queue;
129 static queue<FGTileEntry *> attach_queue;
130 static queue<FGDeferredModel *> model_queue;
131 #endif // ENABLE_THREADS
132 static queue<FGTileEntry *> delete_queue;
135 * Tile filter indicator, to implement multipass rendering
137 static bool tile_filter;
142 * Add a loaded tile to the 'attach to the scene graph' queue.
144 static void ready_to_attach( FGTileEntry *t ) { attach_queue.push( t ); }
147 * Add a pending model to the 'deferred model load' queue
149 static void model_ready( FGDeferredModel *dm ) { model_queue.push( dm ); }
159 // Initialize the Tile Manager subsystem
162 // Update the various queues maintained by the tilemagr (private
163 // internal function, do not call directly.)
164 void update_queues();
166 // get state of all the scenery loading queues
167 bool all_queues_empty();
169 // given the current lon/lat (in degrees), fill in the array of
170 // local chunks. If the chunk isn't already in the cache, then
171 // read it from disk.
172 int update( double visibility_meters );
173 int update( SGLocation *location, double visibility_meters,
174 sgdVec3 abs_pos_vector );
176 int updateCurrentElevAtPos( sgdVec3 abs_pos_vector, double altitude_m,
179 // Determine scenery altitude. Normally this just happens when we
180 // render the scene, but we'd also like to be able to do this
181 // explicitely. lat & lon are in radians. abs_view_pos in
182 // meters. Returns result in meters.
183 void my_ssg_los( string s, ssgBranch *branch, sgdMat4 m,
184 const sgdVec3 p, const sgdVec3 dir, sgdVec3 normal );
186 void my_ssg_los( ssgBranch *branch, sgdMat4 m,
187 const sgdVec3 p, const sgdVec3 dir,
190 // Prepare the ssg nodes corresponding to each tile. For each
191 // tile, set the ssg transform and update it's range selector
192 // based on current visibilty void prep_ssg_nodes( float
193 // visibility_meters );
194 void prep_ssg_nodes( SGLocation *location, float visibility_meters );
195 const Point3D get_current_center(void) const { return current_center; }
197 // Set flag with event manager so that non-moving view refreshes
199 void refresh_view_timestamps();
201 inline SGBucket get_current_bucket () { return current_bucket; }
202 inline SGBucket get_previous_bucket () { return previous_bucket; }
204 static bool set_tile_filter( bool f );
205 static int tile_filter_cb( ssgEntity *, int );
209 #endif // _TILEMGR_HXX