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 "hitlist.hxx"
45 #define FG_LOCAL_X_Y 81 // max(o->tile_diameter) ** 2
47 #define FG_SQUARE( X ) ( (X) * (X) )
49 #if defined(USE_MEM) || defined(WIN32)
50 # define FG_MEM_COPY(to,from,n) memcpy(to, from, n)
52 # define FG_MEM_COPY(to,from,n) bcopy(from, to, n)
56 // forward declaration
82 enum SCROLL_DIRECTION {
91 SCROLL_DIRECTION scroll_direction;
93 // pending tile load queue
94 list < FGLoadRec > load_queue;
96 // initialize the cache
97 void initialize_queue();
99 // forced emptying of the queue. This is necessay to keep
100 // bookeeping straight for the tile_cache -- which actually
101 // handles all the (de)allocations
102 void destroy_queue();
104 FGBucket BucketOffset( int dx, int dy );
106 // schedule a tile for loading
107 int sched_tile( const FGBucket& b );
110 void load_tile( const FGBucket& b, int cache_index );
112 // schedule a tile row(column) for loading
115 // see comment at prep_ssg_nodes()
116 void prep_ssg_node( int idx );
119 // sgdVec3 hit_pts [ MAX_HITS ] ;
121 // ssgEntity *last_hit;
124 FGBucket previous_bucket;
125 FGBucket current_bucket;
128 FGTileEntry *current_tile;
130 // index of current tile in tile cache;
134 // current longitude latitude
137 double last_longitude;
138 double last_latitude;
148 // Initialize the Tile Manager subsystem
151 // given the current lon/lat (in degrees), fill in the array of
152 // local chunks. If the chunk isn't already in the cache, then
153 // read it from disk.
154 int update( double lon, double lat );
156 // Determine scenery altitude. Normally this just happens when we
157 // render the scene, but we'd also like to be able to do this
158 // explicitely. lat & lon are in radians. abs_view_pos in
159 // meters. Returns result in meters.
160 void my_ssg_los( string s, ssgBranch *branch, sgdMat4 m,
161 const sgdVec3 p, const sgdVec3 dir, sgdVec3 normal );
163 void my_ssg_los( ssgBranch *branch, sgdMat4 m,
164 const sgdVec3 p, const sgdVec3 dir,
167 bool current_elev_ssg( const Point3D& abs_view_pos,
168 const Point3D& view_pos );
170 // Prepare the ssg nodes ... for each tile, set it's proper
171 // transform and update it's range selector based on current
173 void prep_ssg_nodes( void );
178 extern FGTileMgr global_tile_mgr;
181 #endif // _TILEMGR_HXX