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/fg_constants.h>
41 #include <Include/fg_types.h>
42 #include <Main/fg_debug.h>
45 #define FG_LOCAL_X 3 /* should be odd */
46 #define FG_LOCAL_Y 3 /* should be odd */
47 #define FG_LOCAL_X_Y 9 /* At least FG_LOCAL_X times FG_LOCAL_Y */
50 /* closest (potentially viewable) tiles, centered on current tile.
51 * This is an array of pointers to cache indexes. */
52 int tiles[FG_LOCAL_X_Y];
55 /* Initialize the Tile Manager subsystem */
56 void fgTileMgrInit( void ) {
57 fgPrintf( FG_TERRAIN, FG_INFO, "Initializing Tile Manager subsystem.\n");
62 void fgTileMgrLoadTile( struct fgBUCKET *p, int *index) {
63 fgPrintf( FG_TERRAIN, FG_DEBUG, "Updating for bucket %d %d %d %d\n",
64 p->lon, p->lat, p->x, p->y);
66 /* if not in cache, load tile into the next available slot */
67 if ( (*index = fgTileCacheExists(p)) < 0 ) {
68 *index = fgTileCacheNextAvail();
69 fgTileCacheEntryFillIn(*index, p);
72 fgPrintf( FG_TERRAIN, FG_DEBUG, "Selected cache index of %d\n", *index);
76 /* given the current lon/lat, fill in the array of local chunks. If
77 * the chunk isn't already in the cache, then read it from disk. */
78 void fgTileMgrUpdate( void ) {
80 struct fgBUCKET p1, p2;
81 static struct fgBUCKET p_last = {-1000, 0, 0, 0};
84 f = current_aircraft.flight;
86 fgBucketFind(FG_Longitude * RAD_TO_DEG, FG_Latitude * RAD_TO_DEG, &p1);
90 if ( (p1.lon == p_last.lon) && (p1.lat == p_last.lat) &&
91 (p1.x == p_last.x) && (p1.y == p_last.y) ) {
92 /* same bucket as last time */
93 fgPrintf( FG_TERRAIN, FG_DEBUG, "Same bucket as last time\n");
94 } else if ( p_last.lon == -1000 ) {
95 /* First time through, initialize the system and load all
98 fgPrintf( FG_TERRAIN, FG_DEBUG, "First time through ... \n");
99 fgPrintf( FG_TERRAIN, FG_DEBUG, "Updating Tile list for %d,%d %d,%d\n",
100 p1.lon, p1.lat, p1.x, p1.y);
102 /* wipe tile cache */
105 /* build the local area list and update cache */
106 for ( j = 0; j < FG_LOCAL_Y; j++ ) {
107 for ( i = 0; i < FG_LOCAL_X; i++ ) {
108 fgBucketOffset(&p1, &p2, i - dw, j - dh);
109 fgTileMgrLoadTile(&p2, &tiles[(j*FG_LOCAL_Y) + i]);
113 /* We've moved to a new bucket, we need to scroll our
114 * structures, and load in the new tiles */
116 /* CURRENTLY THIS ASSUMES WE CAN ONLY MOVE TO ADJACENT TILES.
117 AT ULTRA HIGH SPEEDS THIS ASSUMPTION MAY NOT BE VALID IF
118 THE AIRCRAFT CAN SKIP A TILE IN A SINGLE ITERATION. */
120 if ( (p1.lon > p_last.lon) ||
121 ( (p1.lon == p_last.lon) && (p1.x > p_last.x) ) ) {
122 for ( j = 0; j < FG_LOCAL_Y; j++ ) {
124 for ( i = 0; i < FG_LOCAL_X - 1; i++ ) {
125 tiles[(j*FG_LOCAL_Y) + i] = tiles[(j*FG_LOCAL_Y) + i + 1];
127 /* load in new column */
128 fgBucketOffset(&p_last, &p2, dw + 1, j - dh);
129 fgTileMgrLoadTile(&p2, &tiles[(j*FG_LOCAL_Y) + FG_LOCAL_X - 1]);
131 } else if ( (p1.lon < p_last.lon) ||
132 ( (p1.lon == p_last.lon) && (p1.x < p_last.x) ) ) {
133 for ( j = 0; j < FG_LOCAL_Y; j++ ) {
135 for ( i = FG_LOCAL_X - 1; i > 0; i-- ) {
136 tiles[(j*FG_LOCAL_Y) + i] = tiles[(j*FG_LOCAL_Y) + i - 1];
138 /* load in new column */
139 fgBucketOffset(&p_last, &p2, -dw - 1, j - dh);
140 fgTileMgrLoadTile(&p2, &tiles[(j*FG_LOCAL_Y) + 0]);
144 if ( (p1.lat > p_last.lat) ||
145 ( (p1.lat == p_last.lat) && (p1.y > p_last.y) ) ) {
146 for ( i = 0; i < FG_LOCAL_X; i++ ) {
147 /* scrolling North */
148 for ( j = 0; j < FG_LOCAL_Y - 1; j++ ) {
149 tiles[(j * FG_LOCAL_Y) + i] =
150 tiles[((j+1) * FG_LOCAL_Y) + i];
152 /* load in new column */
153 fgBucketOffset(&p_last, &p2, i - dw, dh + 1);
154 fgTileMgrLoadTile(&p2,
155 &tiles[((FG_LOCAL_Y-1)*FG_LOCAL_Y) + i]);
157 } else if ( (p1.lat < p_last.lat) ||
158 ( (p1.lat == p_last.lat) && (p1.y < p_last.y) ) ) {
159 for ( i = 0; i < FG_LOCAL_X; i++ ) {
160 /* scrolling South */
161 for ( j = FG_LOCAL_Y - 1; j > 0; j-- ) {
162 tiles[(j * FG_LOCAL_Y) + i] =
163 tiles[((j-1) * FG_LOCAL_Y) + i];
165 /* load in new column */
166 fgBucketOffset(&p_last, &p2, i - dw, -dh - 1);
167 fgTileMgrLoadTile(&p2, &tiles[0 + i]);
178 /* Render the local tiles */
179 void fgTileMgrRender( void ) {
182 static GLfloat terrain_color[4] = { 0.6, 0.8, 0.4, 1.0 };
183 static GLfloat terrain_ambient[4];
184 static GLfloat terrain_diffuse[4];
185 struct fgCartesianPoint local_ref;
190 f = current_aircraft.flight;
192 for ( i = 0; i < 4; i++ ) {
193 terrain_ambient[i] = terrain_color[i] * 0.5;
194 terrain_diffuse[i] = terrain_color[i];
197 xglMaterialfv(GL_FRONT, GL_AMBIENT, terrain_ambient);
198 xglMaterialfv(GL_FRONT, GL_DIFFUSE, terrain_diffuse);
200 /* Find current translation offset */
201 fgBucketFind(FG_Longitude * RAD_TO_DEG, FG_Latitude * RAD_TO_DEG, &p);
202 index = fgTileCacheExists(&p);
203 fgTileCacheEntryInfo(index, &display_list, &scenery.center );
205 printf("Current bucket = %d %d %d %d\n", p.lon, p.lat, p.x, p.y );
207 for ( i = 0; i < FG_LOCAL_X_Y; i++ ) {
209 /* fgPrintf( FG_TERRAIN, FG_DEBUG, "Index = %d\n", index); */
210 fgTileCacheEntryInfo(index, &display_list, &local_ref );
212 if ( display_list >= 0 ) {
214 /* xglTranslatef(local_ref.x - scenery.center.x,
215 local_ref.y - scenery.center.y,
216 local_ref.z - scenery.center.z); */
217 xglTranslatef(-scenery.center.x, -scenery.center.y,
219 xglCallList(display_list);
227 /* Revision 1.15 1998/02/11 02:50:44 curt
230 * Revision 1.14 1998/02/09 21:30:19 curt
231 * Fixed a nagging problem with terrain tiles not "quite" matching up perfectly.
233 * Revision 1.13 1998/02/07 15:29:46 curt
234 * Incorporated HUD changes and struct/typedef changes from Charlie Hotchkiss
235 * <chotchkiss@namg.us.anritsu.com>
237 * Revision 1.12 1998/02/01 03:39:55 curt
240 * Revision 1.11 1998/01/31 00:43:27 curt
241 * Added MetroWorks patches from Carmen Volpe.
243 * Revision 1.10 1998/01/29 00:51:40 curt
244 * First pass at tile cache, dynamic tile loading and tile unloading now works.
246 * Revision 1.9 1998/01/27 03:26:44 curt
247 * Playing with new fgPrintf command.
249 * Revision 1.8 1998/01/27 00:48:04 curt
250 * Incorporated Paul Bleisch's <bleisch@chromatic.com> new debug message
251 * system and commandline/config file processing code.
253 * Revision 1.7 1998/01/26 15:55:25 curt
254 * Progressing on building dynamic scenery system.
256 * Revision 1.6 1998/01/24 00:03:30 curt
259 * Revision 1.5 1998/01/19 19:27:18 curt
260 * Merged in make system changes from Bob Kuehne <rpk@sgi.com>
261 * This should simplify things tremendously.
263 * Revision 1.4 1998/01/19 18:40:38 curt
264 * Tons of little changes to clean up the code and to remove fatal errors
265 * when building with the c++ compiler.
267 * Revision 1.3 1998/01/13 00:23:11 curt
268 * Initial changes to support loading and management of scenery tiles. Note,
269 * there's still a fair amount of work left to be done.
271 * Revision 1.2 1998/01/08 02:22:27 curt
272 * Continue working on basic features.
274 * Revision 1.1 1998/01/07 23:50:51 curt
275 * "area" renamed to "tile"
277 * Revision 1.2 1998/01/07 03:29:29 curt
278 * Given an arbitrary lat/lon, we can now:
279 * generate a unique index for the chunk containing the lat/lon
280 * generate a path name to the chunk file
281 * build a list of the indexes of all the nearby areas.
283 * Revision 1.1 1998/01/07 02:05:48 curt