2 * tilemgr.cxx -- 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 **************************************************************************/
38 #include <Scenery/obj.hxx>
39 #include <Scenery/scenery.hxx>
40 #include <Scenery/tilecache.hxx>
42 #include <Aircraft/aircraft.h>
43 #include <Bucket/bucketutils.h>
44 #include <Debug/fg_debug.h>
45 #include <Include/fg_constants.h>
46 #include <Include/fg_types.h>
47 #include <Main/options.hxx>
48 #include <Main/views.hxx>
49 #include <Math/mat3.h>
52 #define FG_LOCAL_X_Y 81 /* max(o->tile_diameter) ** 2 */
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 ) {
87 struct fgBUCKET p1, p2;
88 static struct fgBUCKET p_last = {-1000, 0, 0, 0};
91 f = current_aircraft.flight;
94 fgBucketFind(FG_Longitude * RAD_TO_DEG, FG_Latitude * RAD_TO_DEG, &p1);
95 dw = o->tile_diameter / 2;
96 dh = o->tile_diameter / 2;
98 if ( (p1.lon == p_last.lon) && (p1.lat == p_last.lat) &&
99 (p1.x == p_last.x) && (p1.y == p_last.y) ) {
100 /* same bucket as last time */
101 fgPrintf( FG_TERRAIN, FG_DEBUG, "Same bucket as last time\n");
102 } else if ( p_last.lon == -1000 ) {
103 /* First time through, initialize the system and load all
106 fgPrintf( FG_TERRAIN, FG_INFO, " First time through ... ");
107 fgPrintf( FG_TERRAIN, FG_INFO, " Updating Tile list for %d,%d %d,%d\n",
108 p1.lon, p1.lat, p1.x, p1.y);
109 fgPrintf( FG_TERRAIN, FG_INFO, " Loading %d tiles\n",
110 o->tile_diameter * o->tile_diameter);
112 /* wipe tile cache */
115 /* build the local area list and update cache */
116 for ( j = 0; j < o->tile_diameter; j++ ) {
117 for ( i = 0; i < o->tile_diameter; i++ ) {
118 fgBucketOffset(&p1, &p2, i - dw, j - dh);
119 fgTileMgrLoadTile(&p2, &tiles[(j*o->tile_diameter) + i]);
123 /* We've moved to a new bucket, we need to scroll our
124 * structures, and load in the new tiles */
126 /* CURRENTLY THIS ASSUMES WE CAN ONLY MOVE TO ADJACENT TILES.
127 AT ULTRA HIGH SPEEDS THIS ASSUMPTION MAY NOT BE VALID IF
128 THE AIRCRAFT CAN SKIP A TILE IN A SINGLE ITERATION. */
130 fgPrintf( FG_TERRAIN, FG_INFO, "Updating Tile list for %d,%d %d,%d\n",
131 p1.lon, p1.lat, p1.x, p1.y);
133 if ( (p1.lon > p_last.lon) ||
134 ( (p1.lon == p_last.lon) && (p1.x > p_last.x) ) ) {
135 fgPrintf( FG_TERRAIN, FG_INFO, " Loading %d tiles\n",
137 for ( j = 0; j < o->tile_diameter; j++ ) {
139 for ( i = 0; i < o->tile_diameter - 1; i++ ) {
140 tiles[(j*o->tile_diameter) + i] = tiles[(j*o->tile_diameter) + i + 1];
142 /* load in new column */
143 fgBucketOffset(&p_last, &p2, dw + 1, j - dh);
144 fgTileMgrLoadTile(&p2, &tiles[(j*o->tile_diameter) + o->tile_diameter - 1]);
146 } else if ( (p1.lon < p_last.lon) ||
147 ( (p1.lon == p_last.lon) && (p1.x < p_last.x) ) ) {
148 fgPrintf( FG_TERRAIN, FG_INFO, " Loading %d tiles\n",
150 for ( j = 0; j < o->tile_diameter; j++ ) {
152 for ( i = o->tile_diameter - 1; i > 0; i-- ) {
153 tiles[(j*o->tile_diameter) + i] = tiles[(j*o->tile_diameter) + i - 1];
155 /* load in new column */
156 fgBucketOffset(&p_last, &p2, -dw - 1, j - dh);
157 fgTileMgrLoadTile(&p2, &tiles[(j*o->tile_diameter) + 0]);
161 if ( (p1.lat > p_last.lat) ||
162 ( (p1.lat == p_last.lat) && (p1.y > p_last.y) ) ) {
163 fgPrintf( FG_TERRAIN, FG_INFO, " Loading %d tiles\n",
165 for ( i = 0; i < o->tile_diameter; i++ ) {
166 /* scrolling North */
167 for ( j = 0; j < o->tile_diameter - 1; j++ ) {
168 tiles[(j * o->tile_diameter) + i] =
169 tiles[((j+1) * o->tile_diameter) + i];
171 /* load in new column */
172 fgBucketOffset(&p_last, &p2, i - dw, dh + 1);
173 fgTileMgrLoadTile(&p2, &tiles[((o->tile_diameter-1)*o->tile_diameter) + i]);
175 } else if ( (p1.lat < p_last.lat) ||
176 ( (p1.lat == p_last.lat) && (p1.y < p_last.y) ) ) {
177 fgPrintf( FG_TERRAIN, FG_INFO, " Loading %d tiles\n",
179 for ( i = 0; i < o->tile_diameter; i++ ) {
180 /* scrolling South */
181 for ( j = o->tile_diameter - 1; j > 0; j-- ) {
182 tiles[(j * o->tile_diameter) + i] =
183 tiles[((j-1) * o->tile_diameter) + i];
185 /* load in new column */
186 fgBucketOffset(&p_last, &p2, i - dw, -dh - 1);
187 fgTileMgrLoadTile(&p2, &tiles[0 + i]);
199 // Calculate if point/radius is inside view frustum
201 static int viewable( fgCartesianPoint3d *cp, double radius ) {
204 int viewable = 1; // start by assuming it's viewable
205 double x0, x1, y1, slope;
209 MAT3_SET_HVEC(world, cp->x, cp->y, cp->z, 1.0);
210 MAT3mult_vec(eye, world, v->WORLD_TO_EYE);
211 // printf( "\nworld -> eye = %.2f %.2f %.2f radius = %.2f\n",
212 // eye[0], eye[1], eye[2], radius);
214 // Check near clip plane
215 if ( eye[2] - radius > 0.0 ) {
219 // check right clip plane (from eye perspective)
220 // y = m * (x - x0) = equation of a line intercepting X axis at x0
221 x1 = v->cos_fov_x * radius;
222 y1 = v->sin_fov_x * radius;
223 slope = -1.0 / v->slope_x;
224 x0 = x1 - y1 / slope;
226 // printf("(r) x1 = %.2f y1 = %.2f\n", x1, y1);
227 // printf("eye[0] = %.2f eye[2] = %.2f\n", eye[0], eye[2]);
228 // printf("(r) x0 = %.2f slope_x = %.2f radius = %.2f\n",
229 // x0, slope, radius);
231 if ( eye[2] > slope * (eye[0] - x0) ) {
235 // check left clip plane (from eye perspective)
238 x0 = x1 - y1 / slope;
240 // printf("(r) x1 = %.2f y1 = %.2f\n", x1, y1);
241 // printf("eye[0] = %.2f eye[2] = %.2f\n", eye[0], eye[2]);
242 // printf("(r) x0 = %.2f slope_x = %.2f radius = %.2f\n",
243 // x0, slope, radius);
245 if ( eye[2] > slope * (eye[0] - x0) ) {
249 // check bottom clip plane (from eye perspective)
250 x1 = -(v->cos_fov_y) * radius;
251 y1 = v->sin_fov_y * radius;
252 slope = 1.0 / v->slope_y;
253 x0 = x1 - y1 / slope;
255 // printf("(r) x1 = %.2f y1 = %.2f\n", x1, y1);
256 // printf("eye[1] = %.2f eye[2] = %.2f\n", eye[1], eye[2]);
257 // printf("(r) x0 = %.2f slope_y = %.2f radius = %.2f\n",
258 // x0, slope, radius);
260 if ( eye[2] > slope * (eye[1] - x0) ) {
264 // check top clip plane (from eye perspective)
267 x0 = x1 - y1 / slope;
269 // printf("(r) x1 = %.2f y1 = %.2f\n", x1, y1);
270 // printf("eye[1] = %.2f eye[2] = %.2f\n", eye[1], eye[2]);
271 // printf("(r) x0 = %.2f slope_y = %.2f radius = %.2f\n",
272 // x0, slope, radius);
274 if ( eye[2] > slope * (eye[1] - x0) ) {
282 /* Render the local tiles */
283 void fgTileMgrRender( void ) {
288 fgCartesianPoint3d local_ref, offset;
296 f = current_aircraft.flight;
297 o = ¤t_options;
300 /* Find current translation offset */
301 fgBucketFind(FG_Longitude * RAD_TO_DEG, FG_Latitude * RAD_TO_DEG, &p);
302 index = fgTileCacheExists(&p);
303 fgTileCacheEntryInfo(index, &display_list, &scenery.next_center, &radius );
305 fgPrintf( FG_TERRAIN, FG_DEBUG,
306 "Pos = (%.2f, %.2f) Current bucket = %d %d %d %d Index = %ld\n",
307 FG_Longitude * RAD_TO_DEG, FG_Latitude * RAD_TO_DEG,
308 p.lon, p.lat, p.x, p.y, fgBucketGenIndex(&p) );
310 for ( i = 0; i < (o->tile_diameter * o->tile_diameter); i++ ) {
312 /* fgPrintf( FG_TERRAIN, FG_DEBUG, "Index = %d\n", index); */
313 fgTileCacheEntryInfo(index, &display_list, &local_ref, &radius );
315 if ( display_list >= 0 ) {
317 offset.x = local_ref.x - scenery.center.x;
318 offset.y = local_ref.y - scenery.center.y;
319 offset.z = local_ref.z - scenery.center.z;
321 if ( viewable(&offset, radius) ) {
324 xglTranslatef(offset.x, offset.y, offset.z);
325 xglCallList(display_list);
333 v->vfc_ratio = (double)culled / (double)(drawn + culled);
334 // printf("drawn = %d culled = %d saved = %.2f\n", drawn, culled,
340 /* Revision 1.10 1998/05/17 16:59:34 curt
341 /* Frist pass at view frustum culling now operational.
343 * Revision 1.9 1998/05/16 13:09:58 curt
344 * Beginning to add support for view frustum culling.
345 * Added some temporary code to calculate bouding radius, until the
346 * scenery generation tools and scenery can be updated.
348 * Revision 1.8 1998/05/07 23:15:21 curt
349 * Fixed a glTexImage2D() usage bug where width and height were mis-swapped.
350 * Added support for --tile-radius=n option.
352 * Revision 1.7 1998/05/06 03:16:42 curt
353 * Added an option to control square tile radius.
355 * Revision 1.6 1998/05/02 01:52:18 curt
356 * Playing around with texture coordinates.
358 * Revision 1.5 1998/04/30 12:35:32 curt
359 * Added a command line rendering option specify smooth/flat shading.
361 * Revision 1.4 1998/04/27 03:30:14 curt
362 * Minor transformation adjustments to try to keep scenery tiles closer to
363 * (0, 0, 0) GLfloats run out of precision at the distances we need to model
364 * the earth, but we can do a bunch of pre-transformations using double math
365 * and then cast to GLfloat once everything is close in where we have less
366 * precision problems.
368 * Revision 1.3 1998/04/25 22:06:32 curt
369 * Edited cvs log messages in source files ... bad bad bad!
371 * Revision 1.2 1998/04/24 00:51:09 curt
372 * Wrapped "#include <config.h>" in "#ifdef HAVE_CONFIG_H"
373 * Tweaked the scenery file extentions to be "file.obj" (uncompressed)
374 * or "file.obz" (compressed.)
376 * Revision 1.1 1998/04/22 13:22:48 curt
377 * C++ - ifing the code a bit.
379 * Revision 1.25 1998/04/18 04:14:07 curt
380 * Moved fg_debug.c to it's own library.
382 * Revision 1.24 1998/04/14 02:23:18 curt
383 * Code reorganizations. Added a Lib/ directory for more general libraries.
385 * Revision 1.23 1998/04/08 23:30:08 curt
386 * Adopted Gnu automake/autoconf system.
388 * Revision 1.22 1998/04/03 22:11:38 curt
389 * Converting to Gnu autoconf system.
391 * Revision 1.21 1998/03/23 21:23:05 curt
392 * Debugging output tweaks.
394 * Revision 1.20 1998/03/14 00:30:51 curt
395 * Beginning initial terrain texturing experiments.
397 * Revision 1.19 1998/02/20 00:16:25 curt
400 * Revision 1.18 1998/02/19 13:05:54 curt
401 * Incorporated some HUD tweaks from Michelle America.
402 * Tweaked the sky's sunset/rise colors.
403 * Other misc. tweaks.
405 * Revision 1.17 1998/02/16 13:39:46 curt
406 * Miscellaneous weekend tweaks. Fixed? a cache problem that caused whole
407 * tiles to occasionally be missing.
409 * Revision 1.16 1998/02/12 21:59:53 curt
410 * Incorporated code changes contributed by Charlie Hotchkiss
411 * <chotchkiss@namg.us.anritsu.com>
413 * Revision 1.14 1998/02/09 21:30:19 curt
414 * Fixed a nagging problem with terrain tiles not "quite" matching up perfectly.
416 * Revision 1.13 1998/02/07 15:29:46 curt
417 * Incorporated HUD changes and struct/typedef changes from Charlie Hotchkiss
418 * <chotchkiss@namg.us.anritsu.com>
420 * Revision 1.12 1998/02/01 03:39:55 curt
423 * Revision 1.11 1998/01/31 00:43:27 curt
424 * Added MetroWorks patches from Carmen Volpe.
426 * Revision 1.10 1998/01/29 00:51:40 curt
427 * First pass at tile cache, dynamic tile loading and tile unloading now works.
429 * Revision 1.9 1998/01/27 03:26:44 curt
430 * Playing with new fgPrintf command.
432 * Revision 1.8 1998/01/27 00:48:04 curt
433 * Incorporated Paul Bleisch's <pbleisch@acm.org> new debug message
434 * system and commandline/config file processing code.
436 * Revision 1.7 1998/01/26 15:55:25 curt
437 * Progressing on building dynamic scenery system.
439 * Revision 1.6 1998/01/24 00:03:30 curt
442 * Revision 1.5 1998/01/19 19:27:18 curt
443 * Merged in make system changes from Bob Kuehne <rpk@sgi.com>
444 * This should simplify things tremendously.
446 * Revision 1.4 1998/01/19 18:40:38 curt
447 * Tons of little changes to clean up the code and to remove fatal errors
448 * when building with the c++ compiler.
450 * Revision 1.3 1998/01/13 00:23:11 curt
451 * Initial changes to support loading and management of scenery tiles. Note,
452 * there's still a fair amount of work left to be done.
454 * Revision 1.2 1998/01/08 02:22:27 curt
455 * Continue working on basic features.
457 * Revision 1.1 1998/01/07 23:50:51 curt
458 * "area" renamed to "tile"
460 * Revision 1.2 1998/01/07 03:29:29 curt
461 * Given an arbitrary lat/lon, we can now:
462 * generate a unique index for the chunk containing the lat/lon
463 * generate a path name to the chunk file
464 * build a list of the indexes of all the nearby areas.
466 * Revision 1.1 1998/01/07 02:05:48 curt