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 **************************************************************************/
39 #include <Scenery/scenery.h>
40 #include <Scenery/obj.h>
41 #include <Scenery/tilecache.hxx>
43 #include <Aircraft/aircraft.h>
44 #include <Bucket/bucketutils.h>
45 #include <Debug/fg_debug.h>
46 #include <Include/fg_constants.h>
47 #include <Include/fg_types.h>
50 #define FG_LOCAL_X 7 /* should be odd */
51 #define FG_LOCAL_Y 7 /* should be odd */
52 #define FG_LOCAL_X_Y 49 /* At least FG_LOCAL_X times FG_LOCAL_Y */
55 /* closest (potentially viewable) tiles, centered on current tile.
56 * This is an array of pointers to cache indexes. */
57 int tiles[FG_LOCAL_X_Y];
60 /* Initialize the Tile Manager subsystem */
61 int fgTileMgrInit( void ) {
62 fgPrintf( FG_TERRAIN, FG_INFO, "Initializing Tile Manager subsystem.\n");
68 void fgTileMgrLoadTile( struct fgBUCKET *p, int *index) {
69 fgPrintf( FG_TERRAIN, FG_DEBUG, "Updating for bucket %d %d %d %d\n",
70 p->lon, p->lat, p->x, p->y);
72 /* if not in cache, load tile into the next available slot */
73 if ( (*index = fgTileCacheExists(p)) < 0 ) {
74 *index = fgTileCacheNextAvail();
75 fgTileCacheEntryFillIn(*index, p);
78 fgPrintf( FG_TERRAIN, FG_DEBUG, "Selected cache index of %d\n", *index);
82 /* given the current lon/lat, fill in the array of local chunks. If
83 * the chunk isn't already in the cache, then read it from disk. */
84 int fgTileMgrUpdate( void ) {
86 struct fgBUCKET p1, p2;
87 static struct fgBUCKET p_last = {-1000, 0, 0, 0};
90 f = current_aircraft.flight;
92 fgBucketFind(FG_Longitude * RAD_TO_DEG, FG_Latitude * RAD_TO_DEG, &p1);
96 if ( (p1.lon == p_last.lon) && (p1.lat == p_last.lat) &&
97 (p1.x == p_last.x) && (p1.y == p_last.y) ) {
98 /* same bucket as last time */
99 fgPrintf( FG_TERRAIN, FG_DEBUG, "Same bucket as last time\n");
100 } else if ( p_last.lon == -1000 ) {
101 /* First time through, initialize the system and load all
104 fgPrintf( FG_TERRAIN, FG_DEBUG, "First time through ... \n");
105 fgPrintf( FG_TERRAIN, FG_DEBUG, "Updating Tile list for %d,%d %d,%d\n",
106 p1.lon, p1.lat, p1.x, p1.y);
108 /* wipe tile cache */
111 /* build the local area list and update cache */
112 for ( j = 0; j < FG_LOCAL_Y; j++ ) {
113 for ( i = 0; i < FG_LOCAL_X; i++ ) {
114 fgBucketOffset(&p1, &p2, i - dw, j - dh);
115 fgTileMgrLoadTile(&p2, &tiles[(j*FG_LOCAL_Y) + i]);
119 /* We've moved to a new bucket, we need to scroll our
120 * structures, and load in the new tiles */
122 /* CURRENTLY THIS ASSUMES WE CAN ONLY MOVE TO ADJACENT TILES.
123 AT ULTRA HIGH SPEEDS THIS ASSUMPTION MAY NOT BE VALID IF
124 THE AIRCRAFT CAN SKIP A TILE IN A SINGLE ITERATION. */
126 if ( (p1.lon > p_last.lon) ||
127 ( (p1.lon == p_last.lon) && (p1.x > p_last.x) ) ) {
128 for ( j = 0; j < FG_LOCAL_Y; j++ ) {
130 for ( i = 0; i < FG_LOCAL_X - 1; i++ ) {
131 tiles[(j*FG_LOCAL_Y) + i] = tiles[(j*FG_LOCAL_Y) + i + 1];
133 /* load in new column */
134 fgBucketOffset(&p_last, &p2, dw + 1, j - dh);
135 fgTileMgrLoadTile(&p2, &tiles[(j*FG_LOCAL_Y) + FG_LOCAL_X - 1]);
137 } else if ( (p1.lon < p_last.lon) ||
138 ( (p1.lon == p_last.lon) && (p1.x < p_last.x) ) ) {
139 for ( j = 0; j < FG_LOCAL_Y; j++ ) {
141 for ( i = FG_LOCAL_X - 1; i > 0; i-- ) {
142 tiles[(j*FG_LOCAL_Y) + i] = tiles[(j*FG_LOCAL_Y) + i - 1];
144 /* load in new column */
145 fgBucketOffset(&p_last, &p2, -dw - 1, j - dh);
146 fgTileMgrLoadTile(&p2, &tiles[(j*FG_LOCAL_Y) + 0]);
150 if ( (p1.lat > p_last.lat) ||
151 ( (p1.lat == p_last.lat) && (p1.y > p_last.y) ) ) {
152 for ( i = 0; i < FG_LOCAL_X; i++ ) {
153 /* scrolling North */
154 for ( j = 0; j < FG_LOCAL_Y - 1; j++ ) {
155 tiles[(j * FG_LOCAL_Y) + i] =
156 tiles[((j+1) * FG_LOCAL_Y) + i];
158 /* load in new column */
159 fgBucketOffset(&p_last, &p2, i - dw, dh + 1);
160 fgTileMgrLoadTile(&p2, &tiles[((FG_LOCAL_Y-1)*FG_LOCAL_Y) + i]);
162 } else if ( (p1.lat < p_last.lat) ||
163 ( (p1.lat == p_last.lat) && (p1.y < p_last.y) ) ) {
164 for ( i = 0; i < FG_LOCAL_X; i++ ) {
165 /* scrolling South */
166 for ( j = FG_LOCAL_Y - 1; j > 0; j-- ) {
167 tiles[(j * FG_LOCAL_Y) + i] =
168 tiles[((j-1) * FG_LOCAL_Y) + i];
170 /* load in new column */
171 fgBucketOffset(&p_last, &p2, i - dw, -dh - 1);
172 fgTileMgrLoadTile(&p2, &tiles[0 + i]);
184 /* Render the local tiles */
185 void fgTileMgrRender( void ) {
188 struct fgCartesianPoint local_ref;
193 f = current_aircraft.flight;
195 /* Find current translation offset */
196 fgBucketFind(FG_Longitude * RAD_TO_DEG, FG_Latitude * RAD_TO_DEG, &p);
197 index = fgTileCacheExists(&p);
198 fgTileCacheEntryInfo(index, &display_list, &scenery.next_center );
200 printf("Pos = (%.2f, %.2f) Current bucket = %d %d %d %d Index = %ld\n",
201 FG_Longitude * RAD_TO_DEG, FG_Latitude * RAD_TO_DEG,
202 p.lon, p.lat, p.x, p.y, fgBucketGenIndex(&p) );
204 for ( i = 0; i < FG_LOCAL_X_Y; i++ ) {
206 /* fgPrintf( FG_TERRAIN, FG_DEBUG, "Index = %d\n", index); */
207 fgTileCacheEntryInfo(index, &display_list, &local_ref );
209 if ( display_list >= 0 ) {
211 /* xglTranslatef(local_ref.x - scenery.center.x,
212 local_ref.y - scenery.center.y,
213 local_ref.z - scenery.center.z); */
214 xglTranslatef(-scenery.center.x, -scenery.center.y,
216 xglCallList(display_list);
224 /* Revision 1.2 1998/04/24 00:51:09 curt
225 /* Wrapped "#include <config.h>" in "#ifdef HAVE_CONFIG_H"
226 /* Tweaked the scenery file extentions to be "file.obj" (uncompressed)
227 /* or "file.obz" (compressed.)
229 * Revision 1.1 1998/04/22 13:22:48 curt
230 * C++ - ifing the code a bit.
232 * Revision 1.25 1998/04/18 04:14:07 curt
233 * Moved fg_debug.c to it's own library.
235 * Revision 1.24 1998/04/14 02:23:18 curt
236 * Code reorganizations. Added a Lib/ directory for more general libraries.
238 * Revision 1.23 1998/04/08 23:30:08 curt
239 * Adopted Gnu automake/autoconf system.
241 * Revision 1.22 1998/04/03 22:11:38 curt
242 * Converting to Gnu autoconf system.
244 * Revision 1.21 1998/03/23 21:23:05 curt
245 * Debugging output tweaks.
247 * Revision 1.20 1998/03/14 00:30:51 curt
248 * Beginning initial terrain texturing experiments.
250 * Revision 1.19 1998/02/20 00:16:25 curt
253 * Revision 1.18 1998/02/19 13:05:54 curt
254 * Incorporated some HUD tweaks from Michelle America.
255 * Tweaked the sky's sunset/rise colors.
256 * Other misc. tweaks.
258 * Revision 1.17 1998/02/16 13:39:46 curt
259 * Miscellaneous weekend tweaks. Fixed? a cache problem that caused whole
260 * tiles to occasionally be missing.
262 * Revision 1.16 1998/02/12 21:59:53 curt
263 * Incorporated code changes contributed by Charlie Hotchkiss
264 * <chotchkiss@namg.us.anritsu.com>
266 * Revision 1.14 1998/02/09 21:30:19 curt
267 * Fixed a nagging problem with terrain tiles not "quite" matching up perfectly.
269 * Revision 1.13 1998/02/07 15:29:46 curt
270 * Incorporated HUD changes and struct/typedef changes from Charlie Hotchkiss
271 * <chotchkiss@namg.us.anritsu.com>
273 * Revision 1.12 1998/02/01 03:39:55 curt
276 * Revision 1.11 1998/01/31 00:43:27 curt
277 * Added MetroWorks patches from Carmen Volpe.
279 * Revision 1.10 1998/01/29 00:51:40 curt
280 * First pass at tile cache, dynamic tile loading and tile unloading now works.
282 * Revision 1.9 1998/01/27 03:26:44 curt
283 * Playing with new fgPrintf command.
285 * Revision 1.8 1998/01/27 00:48:04 curt
286 * Incorporated Paul Bleisch's <bleisch@chromatic.com> new debug message
287 * system and commandline/config file processing code.
289 * Revision 1.7 1998/01/26 15:55:25 curt
290 * Progressing on building dynamic scenery system.
292 * Revision 1.6 1998/01/24 00:03:30 curt
295 * Revision 1.5 1998/01/19 19:27:18 curt
296 * Merged in make system changes from Bob Kuehne <rpk@sgi.com>
297 * This should simplify things tremendously.
299 * Revision 1.4 1998/01/19 18:40:38 curt
300 * Tons of little changes to clean up the code and to remove fatal errors
301 * when building with the c++ compiler.
303 * Revision 1.3 1998/01/13 00:23:11 curt
304 * Initial changes to support loading and management of scenery tiles. Note,
305 * there's still a fair amount of work left to be done.
307 * Revision 1.2 1998/01/08 02:22:27 curt
308 * Continue working on basic features.
310 * Revision 1.1 1998/01/07 23:50:51 curt
311 * "area" renamed to "tile"
313 * Revision 1.2 1998/01/07 03:29:29 curt
314 * Given an arbitrary lat/lon, we can now:
315 * generate a unique index for the chunk containing the lat/lon
316 * generate a path name to the chunk file
317 * build a list of the indexes of all the nearby areas.
319 * Revision 1.1 1998/01/07 02:05:48 curt