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 <Include/compiler.h>
36 #include <Bucket/newbucket.hxx>
42 #define FG_LOCAL_X_Y 81 // max(o->tile_diameter) ** 2
44 #define FG_SQUARE( X ) ( (X) * (X) )
46 #if defined(USE_MEM) || defined(WIN32)
47 # define FG_MEM_COPY(to,from,n) memcpy(to, from, n)
49 # define FG_MEM_COPY(to,from,n) bcopy(from, to, n)
66 // closest (potentially viewable) tiles, centered on current tile.
67 // This is an array of pointers to cache indexes.
68 int tiles[FG_LOCAL_X_Y];
79 // pending tile load queue
80 list < FGLoadRec > load_queue;
82 // schedule a tile for loading
83 void sched_tile( const FGBucket& b, int *index );
86 void load_tile( const FGBucket& b, int cache_index );
96 // Initialize the Tile Manager subsystem
99 // given the current lon/lat, fill in the array of local chunks.
100 // If the chunk isn't already in the cache, then read it from
104 // Determine scenery altitude. Normally this just happens when we
105 // render the scene, but we'd also like to be able to do this
106 // explicitely. lat & lon are in radians. abs_view_pos in
107 // meters. Returns result in meters.
108 double current_elev_new( const FGBucket& p );
109 double current_elev( double lon, double lat, const Point3D& abs_view_pos );
111 // Render the local tiles --- hack, hack, hack
117 extern FGTileMgr global_tile_mgr;
120 #endif // _TILEMGR_HXX