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 - curt@infoplane.com
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>
38 #include <simgear/bucket/newbucket.hxx>
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)
54 // forward declaration
56 class FGDeferredModel;
72 // initialize the cache
73 void initialize_queue();
75 // schedule a tile for loading
76 void sched_tile( const SGBucket& b );
78 // schedule a needed buckets for loading
79 void schedule_needed();
81 // see comment at prep_ssg_nodes()
82 void prep_ssg_node( int idx );
86 SGBucket previous_bucket;
87 SGBucket current_bucket;
90 FGTileEntry *current_tile;
92 // x and y distance of tiles to load/draw
96 // current longitude latitude
99 double last_longitude;
100 double last_latitude;
105 FGNewCache tile_cache;
108 * Queue tiles for loading.
116 * attach_queue is the tiles that have been loaded [by the pager]
117 * that can be attached to the scene graph by the render thread.
119 * model_queue is the set of models that need to be loaded by the
120 * primary render thread.
122 #ifdef ENABLE_THREADS
123 static SGLockedQueue<FGTileEntry *> attach_queue;
124 static SGLockedQueue<FGDeferredModel *> model_queue;
126 static queue<FGTileEntry *> attach_queue;
127 static queue<FGDeferredModel *> model_queue;
128 #endif // ENABLE_THREADS
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 ); }
137 #ifdef WISH_PLIB_WAS_THREADED // but it isn't
139 * Tile is detatched from scene graph and is ready to delete
141 inline void ready_to_delete( FGTileEntry *t ) { loader.remove( t ); }
145 * Add a pending model to the 'deferred model load' queue
147 static void model_ready( FGDeferredModel *dm ) { model_queue.push( dm ); }
157 // Initialize the Tile Manager subsystem
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 lon, double lat );
165 // Determine scenery altitude. Normally this just happens when we
166 // render the scene, but we'd also like to be able to do this
167 // explicitely. lat & lon are in radians. abs_view_pos in
168 // meters. Returns result in meters.
169 void my_ssg_los( string s, ssgBranch *branch, sgdMat4 m,
170 const sgdVec3 p, const sgdVec3 dir, sgdVec3 normal );
172 void my_ssg_los( ssgBranch *branch, sgdMat4 m,
173 const sgdVec3 p, const sgdVec3 dir,
177 // Prepare the ssg nodes ... for each tile, set it's proper
178 // transform and update it's range selector based on current
180 void prep_ssg_nodes();
185 extern FGTileMgr global_tile_mgr;
188 #endif // _TILEMGR_HXX