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 // forced emptying of the queue. This is necessay to keep
76 // bookeeping straight for the tile_cache -- which actually
77 // handles all the (de)allocations
80 // schedule a tile for loading
81 void sched_tile( const SGBucket& b );
83 // schedule a needed buckets for loading
84 void schedule_needed();
86 // see comment at prep_ssg_nodes()
87 void prep_ssg_node( int idx );
90 // sgdVec3 hit_pts [ MAX_HITS ] ;
92 // ssgEntity *last_hit;
95 SGBucket previous_bucket;
96 SGBucket current_bucket;
99 FGTileEntry *current_tile;
101 // x and y distance of tiles to load/draw
105 // current longitude latitude
108 double last_longitude;
109 double last_latitude;
114 FGNewCache tile_cache;
117 * Queue tiles for loading.
125 * attach_queue is the tiles that have been loaded [by the pager]
126 * that can be attached to the scene graph by the render thread.
128 * model_queue is the set of models that need to be loaded by the
129 * primary render thread.
131 #ifdef ENABLE_THREADS
132 static SGLockedQueue<FGTileEntry *> attach_queue;
133 static SGLockedQueue<FGDeferredModel *> model_queue;
135 static queue<FGTileEntry *> attach_queue;
136 static queue<FGDeferredModel *> model_queue;
137 #endif // ENABLE_THREADS
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 * Tile is detatched from scene graph and is ready to delete
149 inline void ready_to_delete( FGTileEntry *t ) { loader.remove( t ); }
152 * Add a pending model to the 'deferred model load' queue
154 static void model_ready( FGDeferredModel *dm ) { model_queue.push( dm ); }
164 // Initialize the Tile Manager subsystem
167 // given the current lon/lat (in degrees), fill in the array of
168 // local chunks. If the chunk isn't already in the cache, then
169 // read it from disk.
170 int update( double lon, double lat );
172 // Determine scenery altitude. Normally this just happens when we
173 // render the scene, but we'd also like to be able to do this
174 // explicitely. lat & lon are in radians. abs_view_pos in
175 // meters. Returns result in meters.
176 void my_ssg_los( string s, ssgBranch *branch, sgdMat4 m,
177 const sgdVec3 p, const sgdVec3 dir, sgdVec3 normal );
179 void my_ssg_los( ssgBranch *branch, sgdMat4 m,
180 const sgdVec3 p, const sgdVec3 dir,
183 bool current_elev_ssg( sgdVec3 abs_view_pos, double *terrain_elev );
185 // Prepare the ssg nodes ... for each tile, set it's proper
186 // transform and update it's range selector based on current
188 void prep_ssg_nodes();
193 extern FGTileMgr global_tile_mgr;
196 #endif // _TILEMGR_HXX