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
71 // initialize the cache
72 void initialize_queue();
74 // forced emptying of the queue. This is necessay to keep
75 // bookeeping straight for the tile_cache -- which actually
76 // handles all the (de)allocations
79 // schedule a tile for loading
80 void sched_tile( const SGBucket& b );
82 // schedule a needed buckets for loading
83 void schedule_needed();
85 // see comment at prep_ssg_nodes()
86 void prep_ssg_node( int idx );
89 // sgdVec3 hit_pts [ MAX_HITS ] ;
91 // ssgEntity *last_hit;
94 SGBucket previous_bucket;
95 SGBucket current_bucket;
98 FGTileEntry *current_tile;
100 // x and y distance of tiles to load/draw
104 // current longitude latitude
107 double last_longitude;
108 double last_latitude;
113 FGNewCache tile_cache;
116 * Queue tiles for loading.
122 * Tiles to add to scene graph.
124 #ifdef ENABLE_THREADS
125 static SGLockedQueue<FGTileEntry*> loaded_queue;
127 static queue<FGTileEntry*> loaded_queue;
128 #endif // ENABLE_THREADS
133 * Add a loaded tile to the scene graph queue.
135 static void loaded( FGTileEntry* t ) { loaded_queue.push(t); }
145 // Initialize the Tile Manager subsystem
148 // given the current lon/lat (in degrees), fill in the array of
149 // local chunks. If the chunk isn't already in the cache, then
150 // read it from disk.
151 int update( double lon, double lat );
153 // Determine scenery altitude. Normally this just happens when we
154 // render the scene, but we'd also like to be able to do this
155 // explicitely. lat & lon are in radians. abs_view_pos in
156 // meters. Returns result in meters.
157 void my_ssg_los( string s, ssgBranch *branch, sgdMat4 m,
158 const sgdVec3 p, const sgdVec3 dir, sgdVec3 normal );
160 void my_ssg_los( ssgBranch *branch, sgdMat4 m,
161 const sgdVec3 p, const sgdVec3 dir,
164 bool current_elev_ssg( sgdVec3 abs_view_pos, double *terrain_elev );
166 // Prepare the ssg nodes ... for each tile, set it's proper
167 // transform and update it's range selector based on current
169 void prep_ssg_nodes();
174 extern FGTileMgr global_tile_mgr;
177 #endif // _TILEMGR_HXX