3 * tilemgr.c -- routines to handle dynamic management of scenery tiles
5 * Written by Curtis Olson, started January 1998.
7 * Copyright (C) 1997 Curtis L. Olson - curt@infoplane.com
9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License as
11 * published by the Free Software Foundation; either version 2 of the
12 * License, or (at your option) any later version.
14 * This program is distributed in the hope that it will be useful, but
15 * WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 * General Public License for more details.
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
24 * (Log is kept at end of this file)
25 **************************************************************************/
37 #include <Scenery/scenery.h>
38 #include <Scenery/obj.h>
39 #include <Scenery/tilecache.h>
41 #include <Aircraft/aircraft.h>
42 #include <Bucket/bucketutils.h>
43 #include <Debug/fg_debug.h>
44 #include <Include/fg_constants.h>
45 #include <Include/fg_types.h>
48 #define FG_LOCAL_X 7 /* should be odd */
49 #define FG_LOCAL_Y 7 /* should be odd */
50 #define FG_LOCAL_X_Y 49 /* At least FG_LOCAL_X times FG_LOCAL_Y */
53 /* closest (potentially viewable) tiles, centered on current tile.
54 * This is an array of pointers to cache indexes. */
55 int tiles[FG_LOCAL_X_Y];
58 /* Initialize the Tile Manager subsystem */
59 int fgTileMgrInit( void ) {
60 fgPrintf( FG_TERRAIN, FG_INFO, "Initializing Tile Manager subsystem.\n");
66 void fgTileMgrLoadTile( struct fgBUCKET *p, int *index) {
67 fgPrintf( FG_TERRAIN, FG_DEBUG, "Updating for bucket %d %d %d %d\n",
68 p->lon, p->lat, p->x, p->y);
70 /* if not in cache, load tile into the next available slot */
71 if ( (*index = fgTileCacheExists(p)) < 0 ) {
72 *index = fgTileCacheNextAvail();
73 fgTileCacheEntryFillIn(*index, p);
76 fgPrintf( FG_TERRAIN, FG_DEBUG, "Selected cache index of %d\n", *index);
80 /* given the current lon/lat, fill in the array of local chunks. If
81 * the chunk isn't already in the cache, then read it from disk. */
82 int fgTileMgrUpdate( void ) {
84 struct fgBUCKET p1, p2;
85 static struct fgBUCKET p_last = {-1000, 0, 0, 0};
88 f = current_aircraft.flight;
90 fgBucketFind(FG_Longitude * RAD_TO_DEG, FG_Latitude * RAD_TO_DEG, &p1);
94 if ( (p1.lon == p_last.lon) && (p1.lat == p_last.lat) &&
95 (p1.x == p_last.x) && (p1.y == p_last.y) ) {
96 /* same bucket as last time */
97 fgPrintf( FG_TERRAIN, FG_DEBUG, "Same bucket as last time\n");
98 } else if ( p_last.lon == -1000 ) {
99 /* First time through, initialize the system and load all
102 fgPrintf( FG_TERRAIN, FG_DEBUG, "First time through ... \n");
103 fgPrintf( FG_TERRAIN, FG_DEBUG, "Updating Tile list for %d,%d %d,%d\n",
104 p1.lon, p1.lat, p1.x, p1.y);
106 /* wipe tile cache */
109 /* build the local area list and update cache */
110 for ( j = 0; j < FG_LOCAL_Y; j++ ) {
111 for ( i = 0; i < FG_LOCAL_X; i++ ) {
112 fgBucketOffset(&p1, &p2, i - dw, j - dh);
113 fgTileMgrLoadTile(&p2, &tiles[(j*FG_LOCAL_Y) + i]);
117 /* We've moved to a new bucket, we need to scroll our
118 * structures, and load in the new tiles */
120 /* CURRENTLY THIS ASSUMES WE CAN ONLY MOVE TO ADJACENT TILES.
121 AT ULTRA HIGH SPEEDS THIS ASSUMPTION MAY NOT BE VALID IF
122 THE AIRCRAFT CAN SKIP A TILE IN A SINGLE ITERATION. */
124 if ( (p1.lon > p_last.lon) ||
125 ( (p1.lon == p_last.lon) && (p1.x > p_last.x) ) ) {
126 for ( j = 0; j < FG_LOCAL_Y; j++ ) {
128 for ( i = 0; i < FG_LOCAL_X - 1; i++ ) {
129 tiles[(j*FG_LOCAL_Y) + i] = tiles[(j*FG_LOCAL_Y) + i + 1];
131 /* load in new column */
132 fgBucketOffset(&p_last, &p2, dw + 1, j - dh);
133 fgTileMgrLoadTile(&p2, &tiles[(j*FG_LOCAL_Y) + FG_LOCAL_X - 1]);
135 } else if ( (p1.lon < p_last.lon) ||
136 ( (p1.lon == p_last.lon) && (p1.x < p_last.x) ) ) {
137 for ( j = 0; j < FG_LOCAL_Y; j++ ) {
139 for ( i = FG_LOCAL_X - 1; i > 0; i-- ) {
140 tiles[(j*FG_LOCAL_Y) + i] = tiles[(j*FG_LOCAL_Y) + i - 1];
142 /* load in new column */
143 fgBucketOffset(&p_last, &p2, -dw - 1, j - dh);
144 fgTileMgrLoadTile(&p2, &tiles[(j*FG_LOCAL_Y) + 0]);
148 if ( (p1.lat > p_last.lat) ||
149 ( (p1.lat == p_last.lat) && (p1.y > p_last.y) ) ) {
150 for ( i = 0; i < FG_LOCAL_X; i++ ) {
151 /* scrolling North */
152 for ( j = 0; j < FG_LOCAL_Y - 1; j++ ) {
153 tiles[(j * FG_LOCAL_Y) + i] =
154 tiles[((j+1) * FG_LOCAL_Y) + i];
156 /* load in new column */
157 fgBucketOffset(&p_last, &p2, i - dw, dh + 1);
158 fgTileMgrLoadTile(&p2, &tiles[((FG_LOCAL_Y-1)*FG_LOCAL_Y) + i]);
160 } else if ( (p1.lat < p_last.lat) ||
161 ( (p1.lat == p_last.lat) && (p1.y < p_last.y) ) ) {
162 for ( i = 0; i < FG_LOCAL_X; i++ ) {
163 /* scrolling South */
164 for ( j = FG_LOCAL_Y - 1; j > 0; j-- ) {
165 tiles[(j * FG_LOCAL_Y) + i] =
166 tiles[((j-1) * FG_LOCAL_Y) + i];
168 /* load in new column */
169 fgBucketOffset(&p_last, &p2, i - dw, -dh - 1);
170 fgTileMgrLoadTile(&p2, &tiles[0 + i]);
182 /* Render the local tiles */
183 void fgTileMgrRender( void ) {
186 struct fgCartesianPoint local_ref;
191 f = current_aircraft.flight;
193 /* Find current translation offset */
194 fgBucketFind(FG_Longitude * RAD_TO_DEG, FG_Latitude * RAD_TO_DEG, &p);
195 index = fgTileCacheExists(&p);
196 fgTileCacheEntryInfo(index, &display_list, &scenery.next_center );
198 printf("Pos = (%.2f, %.2f) Current bucket = %d %d %d %d Index = %ld\n",
199 FG_Longitude * RAD_TO_DEG, FG_Latitude * RAD_TO_DEG,
200 p.lon, p.lat, p.x, p.y, fgBucketGenIndex(&p) );
202 for ( i = 0; i < FG_LOCAL_X_Y; i++ ) {
204 /* fgPrintf( FG_TERRAIN, FG_DEBUG, "Index = %d\n", index); */
205 fgTileCacheEntryInfo(index, &display_list, &local_ref );
207 if ( display_list >= 0 ) {
209 /* xglTranslatef(local_ref.x - scenery.center.x,
210 local_ref.y - scenery.center.y,
211 local_ref.z - scenery.center.z); */
212 xglTranslatef(-scenery.center.x, -scenery.center.y,
214 xglCallList(display_list);
222 /* Revision 1.25 1998/04/18 04:14:07 curt
223 /* Moved fg_debug.c to it's own library.
225 * Revision 1.24 1998/04/14 02:23:18 curt
226 * Code reorganizations. Added a Lib/ directory for more general libraries.
228 * Revision 1.23 1998/04/08 23:30:08 curt
229 * Adopted Gnu automake/autoconf system.
231 * Revision 1.22 1998/04/03 22:11:38 curt
232 * Converting to Gnu autoconf system.
234 * Revision 1.21 1998/03/23 21:23:05 curt
235 * Debugging output tweaks.
237 * Revision 1.20 1998/03/14 00:30:51 curt
238 * Beginning initial terrain texturing experiments.
240 * Revision 1.19 1998/02/20 00:16:25 curt
243 * Revision 1.18 1998/02/19 13:05:54 curt
244 * Incorporated some HUD tweaks from Michelle America.
245 * Tweaked the sky's sunset/rise colors.
246 * Other misc. tweaks.
248 * Revision 1.17 1998/02/16 13:39:46 curt
249 * Miscellaneous weekend tweaks. Fixed? a cache problem that caused whole
250 * tiles to occasionally be missing.
252 * Revision 1.16 1998/02/12 21:59:53 curt
253 * Incorporated code changes contributed by Charlie Hotchkiss
254 * <chotchkiss@namg.us.anritsu.com>
256 * Revision 1.14 1998/02/09 21:30:19 curt
257 * Fixed a nagging problem with terrain tiles not "quite" matching up perfectly.
259 * Revision 1.13 1998/02/07 15:29:46 curt
260 * Incorporated HUD changes and struct/typedef changes from Charlie Hotchkiss
261 * <chotchkiss@namg.us.anritsu.com>
263 * Revision 1.12 1998/02/01 03:39:55 curt
266 * Revision 1.11 1998/01/31 00:43:27 curt
267 * Added MetroWorks patches from Carmen Volpe.
269 * Revision 1.10 1998/01/29 00:51:40 curt
270 * First pass at tile cache, dynamic tile loading and tile unloading now works.
272 * Revision 1.9 1998/01/27 03:26:44 curt
273 * Playing with new fgPrintf command.
275 * Revision 1.8 1998/01/27 00:48:04 curt
276 * Incorporated Paul Bleisch's <bleisch@chromatic.com> new debug message
277 * system and commandline/config file processing code.
279 * Revision 1.7 1998/01/26 15:55:25 curt
280 * Progressing on building dynamic scenery system.
282 * Revision 1.6 1998/01/24 00:03:30 curt
285 * Revision 1.5 1998/01/19 19:27:18 curt
286 * Merged in make system changes from Bob Kuehne <rpk@sgi.com>
287 * This should simplify things tremendously.
289 * Revision 1.4 1998/01/19 18:40:38 curt
290 * Tons of little changes to clean up the code and to remove fatal errors
291 * when building with the c++ compiler.
293 * Revision 1.3 1998/01/13 00:23:11 curt
294 * Initial changes to support loading and management of scenery tiles. Note,
295 * there's still a fair amount of work left to be done.
297 * Revision 1.2 1998/01/08 02:22:27 curt
298 * Continue working on basic features.
300 * Revision 1.1 1998/01/07 23:50:51 curt
301 * "area" renamed to "tile"
303 * Revision 1.2 1998/01/07 03:29:29 curt
304 * Given an arbitrary lat/lon, we can now:
305 * generate a unique index for the chunk containing the lat/lon
306 * generate a path name to the chunk file
307 * build a list of the indexes of all the nearby areas.
309 * Revision 1.1 1998/01/07 02:05:48 curt