1 /**************************************************************************
2 * tilecache.c -- routines to handle scenery tile caching
4 * Written by Curtis Olson, started January 1998.
6 * Copyright (C) 1997 Curtis L. Olson - curt@infoplane.com
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License as
10 * published by the Free Software Foundation; either version 2 of the
11 * License, or (at your option) any later version.
13 * This program is distributed in the hope that it will be useful, but
14 * WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * General Public License for more details.
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
23 * (Log is kept at end of this file)
24 **************************************************************************/
34 #include <Include/general.h>
35 #include <Scenery/bucketutils.h>
36 #include <Scenery/obj.h>
37 #include <Scenery/tilecache.h>
38 #include <Main/fg_debug.h>
42 struct fgTILE tile_cache[FG_TILE_CACHE_SIZE];
45 /* Initialize the tile cache subsystem */
46 void fgTileCacheInit( void ) {
49 fgPrintf(FG_TERRAIN, FG_INFO, "Initializing the tile cache.\n");
51 for ( i = 0; i < FG_TILE_CACHE_SIZE; i++ ) {
52 tile_cache[i].used = 0;
57 /* Return index of next available slot in tile cache */
58 int fgTileCacheNextAvail( void ) {
61 for ( i = 0; i < FG_TILE_CACHE_SIZE; i++ ) {
62 if ( tile_cache[i].used == 0 ) {
71 /* Fill in a tile cache entry with real data for the specified bucket */
72 void fgTileCacheEntryFillIn( int index, struct fgBUCKET *p ) {
79 /* Mark this cache entry as used */
80 tile_cache[index].used = 1;
82 /* Update the bucket */
83 tile_cache[index].tile_bucket.lon = p->lon;
84 tile_cache[index].tile_bucket.lat = p->lat;
85 tile_cache[index].tile_bucket.x = p->x;
86 tile_cache[index].tile_bucket.y = p->y;
88 /* Load the appropriate area and get the display list pointer */
89 fgBucketGenBasePath(p, base_path);
90 sprintf(file_name, "%s/Scenery/%s/%ld.obj", g->root_dir,
91 base_path, fgBucketGenIndex(p));
92 tile_cache[index].display_list =
93 fgObjLoad(file_name, &tile_cache[index].local_ref);
97 /* Return info for a tile cache entry */
98 void fgTileCacheEntryInfo( int index, GLint *display_list,
99 struct fgCartesianPoint *local_ref ) {
100 *display_list = tile_cache[index].display_list;
101 /* fgPrintf(FG_TERRAIN, FG_DEBUG, "Display list = %d\n", *display_list); */
103 local_ref->x = tile_cache[index].local_ref.x;
104 local_ref->y = tile_cache[index].local_ref.y;
105 local_ref->z = tile_cache[index].local_ref.z;
109 /* Free the specified cache entry
110 void fgTileCacheEntryFree( in index ) {
116 /* Revision 1.4 1998/01/27 03:26:43 curt
117 /* Playing with new fgPrintf command.
119 * Revision 1.3 1998/01/27 00:48:03 curt
120 * Incorporated Paul Bleisch's <bleisch@chromatic.com> new debug message
121 * system and commandline/config file processing code.
123 * Revision 1.2 1998/01/26 15:55:24 curt
124 * Progressing on building dynamic scenery system.
126 * Revision 1.1 1998/01/24 00:03:29 curt