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 **************************************************************************/
35 #include <Scenery/scenery.h>
36 #include <Scenery/bucketutils.h>
37 #include <Scenery/obj.h>
38 #include <Scenery/tilecache.h>
40 #include <Aircraft/aircraft.h>
41 #include <Include/fg_constants.h>
42 #include <Include/fg_types.h>
43 #include <Main/fg_debug.h>
46 #define FG_LOCAL_X 7 /* should be odd */
47 #define FG_LOCAL_Y 7 /* should be odd */
48 #define FG_LOCAL_X_Y 49 /* At least FG_LOCAL_X times FG_LOCAL_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 /* Initialize the Tile Manager subsystem */
57 int fgTileMgrInit( void ) {
58 fgPrintf( FG_TERRAIN, FG_INFO, "Initializing Tile Manager subsystem.\n");
64 void fgTileMgrLoadTile( struct fgBUCKET *p, int *index) {
65 fgPrintf( FG_TERRAIN, FG_DEBUG, "Updating for bucket %d %d %d %d\n",
66 p->lon, p->lat, p->x, p->y);
68 /* if not in cache, load tile into the next available slot */
69 if ( (*index = fgTileCacheExists(p)) < 0 ) {
70 *index = fgTileCacheNextAvail();
71 fgTileCacheEntryFillIn(*index, p);
74 fgPrintf( FG_TERRAIN, FG_DEBUG, "Selected cache index of %d\n", *index);
78 /* given the current lon/lat, fill in the array of local chunks. If
79 * the chunk isn't already in the cache, then read it from disk. */
80 int fgTileMgrUpdate( void ) {
82 struct fgBUCKET p1, p2;
83 static struct fgBUCKET p_last = {-1000, 0, 0, 0};
86 f = current_aircraft.flight;
88 fgBucketFind(FG_Longitude * RAD_TO_DEG, FG_Latitude * RAD_TO_DEG, &p1);
92 if ( (p1.lon == p_last.lon) && (p1.lat == p_last.lat) &&
93 (p1.x == p_last.x) && (p1.y == p_last.y) ) {
94 /* same bucket as last time */
95 fgPrintf( FG_TERRAIN, FG_DEBUG, "Same bucket as last time\n");
96 } else if ( p_last.lon == -1000 ) {
97 /* First time through, initialize the system and load all
100 fgPrintf( FG_TERRAIN, FG_DEBUG, "First time through ... \n");
101 fgPrintf( FG_TERRAIN, FG_DEBUG, "Updating Tile list for %d,%d %d,%d\n",
102 p1.lon, p1.lat, p1.x, p1.y);
104 /* wipe tile cache */
107 /* build the local area list and update cache */
108 for ( j = 0; j < FG_LOCAL_Y; j++ ) {
109 for ( i = 0; i < FG_LOCAL_X; i++ ) {
110 fgBucketOffset(&p1, &p2, i - dw, j - dh);
111 fgTileMgrLoadTile(&p2, &tiles[(j*FG_LOCAL_Y) + i]);
115 /* We've moved to a new bucket, we need to scroll our
116 * structures, and load in the new tiles */
118 /* CURRENTLY THIS ASSUMES WE CAN ONLY MOVE TO ADJACENT TILES.
119 AT ULTRA HIGH SPEEDS THIS ASSUMPTION MAY NOT BE VALID IF
120 THE AIRCRAFT CAN SKIP A TILE IN A SINGLE ITERATION. */
122 if ( (p1.lon > p_last.lon) ||
123 ( (p1.lon == p_last.lon) && (p1.x > p_last.x) ) ) {
124 for ( j = 0; j < FG_LOCAL_Y; j++ ) {
126 for ( i = 0; i < FG_LOCAL_X - 1; i++ ) {
127 tiles[(j*FG_LOCAL_Y) + i] = tiles[(j*FG_LOCAL_Y) + i + 1];
129 /* load in new column */
130 fgBucketOffset(&p_last, &p2, dw + 1, j - dh);
131 fgTileMgrLoadTile(&p2, &tiles[(j*FG_LOCAL_Y) + FG_LOCAL_X - 1]);
133 } else if ( (p1.lon < p_last.lon) ||
134 ( (p1.lon == p_last.lon) && (p1.x < p_last.x) ) ) {
135 for ( j = 0; j < FG_LOCAL_Y; j++ ) {
137 for ( i = FG_LOCAL_X - 1; i > 0; i-- ) {
138 tiles[(j*FG_LOCAL_Y) + i] = tiles[(j*FG_LOCAL_Y) + i - 1];
140 /* load in new column */
141 fgBucketOffset(&p_last, &p2, -dw - 1, j - dh);
142 fgTileMgrLoadTile(&p2, &tiles[(j*FG_LOCAL_Y) + 0]);
146 if ( (p1.lat > p_last.lat) ||
147 ( (p1.lat == p_last.lat) && (p1.y > p_last.y) ) ) {
148 for ( i = 0; i < FG_LOCAL_X; i++ ) {
149 /* scrolling North */
150 for ( j = 0; j < FG_LOCAL_Y - 1; j++ ) {
151 tiles[(j * FG_LOCAL_Y) + i] =
152 tiles[((j+1) * FG_LOCAL_Y) + i];
154 /* load in new column */
155 fgBucketOffset(&p_last, &p2, i - dw, dh + 1);
156 fgTileMgrLoadTile(&p2, &tiles[((FG_LOCAL_Y-1)*FG_LOCAL_Y) + i]);
158 } else if ( (p1.lat < p_last.lat) ||
159 ( (p1.lat == p_last.lat) && (p1.y < p_last.y) ) ) {
160 for ( i = 0; i < FG_LOCAL_X; i++ ) {
161 /* scrolling South */
162 for ( j = FG_LOCAL_Y - 1; j > 0; j-- ) {
163 tiles[(j * FG_LOCAL_Y) + i] =
164 tiles[((j-1) * FG_LOCAL_Y) + i];
166 /* load in new column */
167 fgBucketOffset(&p_last, &p2, i - dw, -dh - 1);
168 fgTileMgrLoadTile(&p2, &tiles[0 + i]);
180 /* Render the local tiles */
181 void fgTileMgrRender( void ) {
184 struct fgCartesianPoint local_ref;
189 f = current_aircraft.flight;
191 /* Find current translation offset */
192 fgBucketFind(FG_Longitude * RAD_TO_DEG, FG_Latitude * RAD_TO_DEG, &p);
193 index = fgTileCacheExists(&p);
194 fgTileCacheEntryInfo(index, &display_list, &scenery.next_center );
196 printf("Current bucket = %d %d %d %d\n", p.lon, p.lat, p.x, p.y );
198 for ( i = 0; i < FG_LOCAL_X_Y; i++ ) {
200 /* fgPrintf( FG_TERRAIN, FG_DEBUG, "Index = %d\n", index); */
201 fgTileCacheEntryInfo(index, &display_list, &local_ref );
203 if ( display_list >= 0 ) {
205 /* xglTranslatef(local_ref.x - scenery.center.x,
206 local_ref.y - scenery.center.y,
207 local_ref.z - scenery.center.z); */
208 xglTranslatef(-scenery.center.x, -scenery.center.y,
210 xglCallList(display_list);
218 /* Revision 1.20 1998/03/14 00:30:51 curt
219 /* Beginning initial terrain texturing experiments.
221 * Revision 1.19 1998/02/20 00:16:25 curt
224 * Revision 1.18 1998/02/19 13:05:54 curt
225 * Incorporated some HUD tweaks from Michelle America.
226 * Tweaked the sky's sunset/rise colors.
227 * Other misc. tweaks.
229 * Revision 1.17 1998/02/16 13:39:46 curt
230 * Miscellaneous weekend tweaks. Fixed? a cache problem that caused whole
231 * tiles to occasionally be missing.
233 * Revision 1.16 1998/02/12 21:59:53 curt
234 * Incorporated code changes contributed by Charlie Hotchkiss
235 * <chotchkiss@namg.us.anritsu.com>
237 * Revision 1.14 1998/02/09 21:30:19 curt
238 * Fixed a nagging problem with terrain tiles not "quite" matching up perfectly.
240 * Revision 1.13 1998/02/07 15:29:46 curt
241 * Incorporated HUD changes and struct/typedef changes from Charlie Hotchkiss
242 * <chotchkiss@namg.us.anritsu.com>
244 * Revision 1.12 1998/02/01 03:39:55 curt
247 * Revision 1.11 1998/01/31 00:43:27 curt
248 * Added MetroWorks patches from Carmen Volpe.
250 * Revision 1.10 1998/01/29 00:51:40 curt
251 * First pass at tile cache, dynamic tile loading and tile unloading now works.
253 * Revision 1.9 1998/01/27 03:26:44 curt
254 * Playing with new fgPrintf command.
256 * Revision 1.8 1998/01/27 00:48:04 curt
257 * Incorporated Paul Bleisch's <bleisch@chromatic.com> new debug message
258 * system and commandline/config file processing code.
260 * Revision 1.7 1998/01/26 15:55:25 curt
261 * Progressing on building dynamic scenery system.
263 * Revision 1.6 1998/01/24 00:03:30 curt
266 * Revision 1.5 1998/01/19 19:27:18 curt
267 * Merged in make system changes from Bob Kuehne <rpk@sgi.com>
268 * This should simplify things tremendously.
270 * Revision 1.4 1998/01/19 18:40:38 curt
271 * Tons of little changes to clean up the code and to remove fatal errors
272 * when building with the c++ compiler.
274 * Revision 1.3 1998/01/13 00:23:11 curt
275 * Initial changes to support loading and management of scenery tiles. Note,
276 * there's still a fair amount of work left to be done.
278 * Revision 1.2 1998/01/08 02:22:27 curt
279 * Continue working on basic features.
281 * Revision 1.1 1998/01/07 23:50:51 curt
282 * "area" renamed to "tile"
284 * Revision 1.2 1998/01/07 03:29:29 curt
285 * Given an arbitrary lat/lon, we can now:
286 * generate a unique index for the chunk containing the lat/lon
287 * generate a path name to the chunk file
288 * build a list of the indexes of all the nearby areas.
290 * Revision 1.1 1998/01/07 02:05:48 curt