1 // tilecache.hxx -- routines to handle scenery tile caching
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.
24 #ifndef _TILECACHE_HXX
25 #define _TILECACHE_HXX
29 # error This library requires C++
44 #include <Bucket/newbucket.hxx>
45 #include <Math/point3d.hxx>
50 // For best results ... i.e. to avoid tile load problems and blank areas
52 // FG_TILE_CACHE_SIZE >= (o->tile_diameter + 1) ** 2
53 #define FG_TILE_CACHE_SIZE 121
55 // A class to store and manage a pile of tiles
60 // // For best results... i.e. to avoid tile load problems and blank areas
61 // // FG_TILE_CACHE_SIZE >= (o->tile_diameter + 1) ** 2
62 // FG_TILE_CACHE_SIZE = 121
65 // cache storage space
66 fgTILE tile_cache[ FG_TILE_CACHE_SIZE ];
73 // Initialize the tile cache subsystem
76 // Search for the specified "bucket" in the cache
77 int exists( const FGBucket& p );
79 // Return index of next available slot in tile cache
80 int next_avail( void );
82 // Free a tile cache entry
83 void entry_free( int index );
85 // Fill in a tile cache entry with real data for the specified bucket
86 void fill_in( int index, FGBucket& p );
88 // Return a pointer to the specified tile cache entry
89 fgTILE *get_tile( int index ) {
90 return &tile_cache[index];
99 extern fgTILECACHE global_tile_cache;
102 #endif // _TILECACHE_HXX