1 /**************************************************************************
2 * tilemgr.c -- routines to handle dynamic management of scenery tiles
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 <Scenery/scenery.h>
35 #include <Scenery/bucketutils.h>
36 #include <Scenery/obj.h>
37 #include <Scenery/tilecache.h>
39 #include <Aircraft/aircraft.h>
40 #include <Include/constants.h>
41 #include <Include/types.h>
44 #define FG_LOCAL_X 3 /* should be odd */
45 #define FG_LOCAL_Y 3 /* should be odd */
46 #define FG_LOCAL_X_Y 9 /* At least FG_LOCAL_X times FG_LOCAL_Y */
48 #define FG_TILE_CACHE_SIZE 100 /* Must be > FG_LOCAL_X_Y */
51 /* closest (potentially viewable) tiles, centered on current tile.
52 * This is an array of pointers to cache indexes. */
53 int tiles[FG_LOCAL_X_Y];
56 struct fgTILE tile_cache[FG_TILE_CACHE_SIZE];
59 /* Initialize the Tile Manager subsystem */
60 void fgTileMgrInit( void ) {
61 printf("Initializing Tile Manager subsystem.\n");
66 /* given the current lon/lat, fill in the array of local chunks. If
67 * the chunk isn't already in the cache, then read it from disk. */
68 void fgTileMgrUpdate( void ) {
70 struct fgBUCKET p1, p2;
71 static struct fgBUCKET p_last = {-1000, 0, 0, 0};
75 f = ¤t_aircraft.flight;
77 fgBucketFind(FG_Longitude * RAD_TO_DEG, FG_Latitude * RAD_TO_DEG, &p1);
79 if ( (p1.lon == p_last.lon) && (p1.lat == p_last.lat) &&
80 (p1.x == p_last.x) && (p1.y == p_last.y) ) {
81 /* same bucket as last time */
82 printf("Same bucket as last time\n");
86 if ( p_last.lon == -1000 ) {
87 printf("First time through ... \n");
88 printf("Updating Tile list for %d,%d %d,%d\n",
89 p1.lon, p1.lat, p1.x, p1.y);
94 /* build the local area list and update cache */
98 for ( j = 0; j < FG_LOCAL_Y; j++ ) {
99 for ( i = 0; i < FG_LOCAL_X; i++ ) {
100 fgBucketOffset(&p1, &p2, i - dw, j - dh);
101 printf("Updating for bucket %d %d %d %d\n",
102 p2.lon, p2.lat, p2.x, p2.y);
104 index = fgTileCacheNextAvail();
105 printf("Selected cache index of %d\n", index);
107 tiles[(j*FG_LOCAL_Y) + i] = index;
108 fgTileCacheEntryFillIn(index, &p2);
115 /* Render the local tiles --- hack, hack, hack */
116 void fgTileMgrRender( void ) {
117 static GLfloat terrain_color[4] = { 0.6, 0.8, 0.4, 1.0 };
118 static GLfloat terrain_ambient[4];
119 static GLfloat terrain_diffuse[4];
120 struct fgCartesianPoint local_ref;
125 for ( i = 0; i < 4; i++ ) {
126 terrain_ambient[i] = terrain_color[i] * 0.5;
127 terrain_diffuse[i] = terrain_color[i];
130 xglMaterialfv(GL_FRONT, GL_AMBIENT, terrain_ambient);
131 xglMaterialfv(GL_FRONT, GL_DIFFUSE, terrain_diffuse);
133 for ( i = 0; i < FG_LOCAL_X_Y; i++ ) {
135 /* printf("Index = %d\n", index); */
136 fgTileCacheEntryInfo(index, &display_list, &local_ref );
139 xglTranslatef(local_ref.x - scenery.center.x,
140 local_ref.y - scenery.center.y,
141 local_ref.z - scenery.center.z);
142 xglCallList(display_list);
149 /* Revision 1.6 1998/01/24 00:03:30 curt
152 * Revision 1.5 1998/01/19 19:27:18 curt
153 * Merged in make system changes from Bob Kuehne <rpk@sgi.com>
154 * This should simplify things tremendously.
156 * Revision 1.4 1998/01/19 18:40:38 curt
157 * Tons of little changes to clean up the code and to remove fatal errors
158 * when building with the c++ compiler.
160 * Revision 1.3 1998/01/13 00:23:11 curt
161 * Initial changes to support loading and management of scenery tiles. Note,
162 * there's still a fair amount of work left to be done.
164 * Revision 1.2 1998/01/08 02:22:27 curt
165 * Continue working on basic features.
167 * Revision 1.1 1998/01/07 23:50:51 curt
168 * "area" renamed to "tile"
170 * Revision 1.2 1998/01/07 03:29:29 curt
171 * Given an arbitrary lat/lon, we can now:
172 * generate a unique index for the chunk containing the lat/lon
173 * generate a path name to the chunk file
174 * build a list of the indexes of all the nearby areas.
176 * Revision 1.1 1998/01/07 02:05:48 curt