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");
68 void fgTileMgrLoadTile( struct fgBUCKET *p, int *index) {
69 printf("Updating for bucket %d %d %d %d\n",
70 p->lon, p->lat, p->x, p->y);
72 *index = fgTileCacheNextAvail();
73 printf("Selected cache index of %d\n", *index);
75 fgTileCacheEntryFillIn(*index, p);
79 /* given the current lon/lat, fill in the array of local chunks. If
80 * the chunk isn't already in the cache, then read it from disk. */
81 void fgTileMgrUpdate( void ) {
83 struct fgBUCKET p1, p2;
84 static struct fgBUCKET p_last = {-1000, 0, 0, 0};
87 f = ¤t_aircraft.flight;
89 fgBucketFind(FG_Longitude * RAD_TO_DEG, FG_Latitude * RAD_TO_DEG, &p1);
93 if ( (p1.lon == p_last.lon) && (p1.lat == p_last.lat) &&
94 (p1.x == p_last.x) && (p1.y == p_last.y) ) {
95 /* same bucket as last time */
96 printf("Same bucket as last time\n");
97 } else if ( p_last.lon == -1000 ) {
98 /* First time through, initialize the system and load all
101 printf("First time through ... \n");
102 printf("Updating Tile list for %d,%d %d,%d\n",
103 p1.lon, p1.lat, p1.x, p1.y);
105 /* wipe tile cache */
108 /* build the local area list and update cache */
109 for ( j = 0; j < FG_LOCAL_Y; j++ ) {
110 for ( i = 0; i < FG_LOCAL_X; i++ ) {
111 fgBucketOffset(&p1, &p2, i - dw, j - dh);
112 fgTileMgrLoadTile(&p2, &tiles[(j*FG_LOCAL_Y) + i]);
116 /* We've moved to a new bucket, we need to scroll our
117 * structures, and load in the new tiles */
119 /* CURRENTLY THIS ASSUMES WE CAN ONLY MOVE TO ADJACENT TILES.
120 AT ULTRA HIGH SPEEDS THIS ASSUMPTION MAY NOT BE VALID IF
121 THE AIRCRAFT CAN SKIP A TILE IN A SINGLE ITERATION. */
123 if ( (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) || (p1.x < p_last.x) ) {
134 for ( j = 0; j < FG_LOCAL_Y; j++ ) {
136 for ( i = FG_LOCAL_X - 1; i > 0; i-- ) {
137 tiles[(j*FG_LOCAL_Y) + i] = tiles[(j*FG_LOCAL_Y) + i - 1];
139 /* load in new column */
140 fgBucketOffset(&p_last, &p2, -dw - 1, j - dh);
141 fgTileMgrLoadTile(&p2, &tiles[(j*FG_LOCAL_Y) + 0]);
145 if ( (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) || (p1.y < p_last.y) ) {
158 for ( i = 0; i < FG_LOCAL_X; i++ ) {
159 /* scrolling South */
160 for ( j = FG_LOCAL_Y - 1; j > 0; j-- ) {
161 tiles[(j * FG_LOCAL_Y) + i] =
162 tiles[((j-1) * FG_LOCAL_Y) + i];
164 /* load in new column */
165 fgBucketOffset(&p_last, &p2, i - dw, -dh - 1);
166 fgTileMgrLoadTile(&p2, &tiles[0 + i]);
177 /* Render the local tiles */
178 void fgTileMgrRender( void ) {
179 static GLfloat terrain_color[4] = { 0.6, 0.8, 0.4, 1.0 };
180 static GLfloat terrain_ambient[4];
181 static GLfloat terrain_diffuse[4];
182 struct fgCartesianPoint local_ref;
187 for ( i = 0; i < 4; i++ ) {
188 terrain_ambient[i] = terrain_color[i] * 0.5;
189 terrain_diffuse[i] = terrain_color[i];
192 xglMaterialfv(GL_FRONT, GL_AMBIENT, terrain_ambient);
193 xglMaterialfv(GL_FRONT, GL_DIFFUSE, terrain_diffuse);
195 for ( i = 0; i < FG_LOCAL_X_Y; i++ ) {
197 /* printf("Index = %d\n", index); */
198 fgTileCacheEntryInfo(index, &display_list, &local_ref );
201 xglTranslatef(local_ref.x - scenery.center.x,
202 local_ref.y - scenery.center.y,
203 local_ref.z - scenery.center.z);
204 xglCallList(display_list);
211 /* Revision 1.7 1998/01/26 15:55:25 curt
212 /* Progressing on building dynamic scenery system.
214 * Revision 1.6 1998/01/24 00:03:30 curt
217 * Revision 1.5 1998/01/19 19:27:18 curt
218 * Merged in make system changes from Bob Kuehne <rpk@sgi.com>
219 * This should simplify things tremendously.
221 * Revision 1.4 1998/01/19 18:40:38 curt
222 * Tons of little changes to clean up the code and to remove fatal errors
223 * when building with the c++ compiler.
225 * Revision 1.3 1998/01/13 00:23:11 curt
226 * Initial changes to support loading and management of scenery tiles. Note,
227 * there's still a fair amount of work left to be done.
229 * Revision 1.2 1998/01/08 02:22:27 curt
230 * Continue working on basic features.
232 * Revision 1.1 1998/01/07 23:50:51 curt
233 * "area" renamed to "tile"
235 * Revision 1.2 1998/01/07 03:29:29 curt
236 * Given an arbitrary lat/lon, we can now:
237 * generate a unique index for the chunk containing the lat/lon
238 * generate a path name to the chunk file
239 * build a list of the indexes of all the nearby areas.
241 * Revision 1.1 1998/01/07 02:05:48 curt