1 // tilemgr.cxx -- routines to handle dynamic management of scenery tiles
3 // Written by Curtis Olson, started January 1998.
5 // Copyright (C) 1997 Curtis L. Olson - curt@infoplane.com
7 // This program is free software; you can redistribute it and/or
8 // modify it under the terms of the GNU General Public License as
9 // published by the Free Software Foundation; either version 2 of the
10 // License, or (at your option) any later version.
12 // This program is distributed in the hope that it will be useful, but
13 // WITHOUT ANY WARRANTY; without even the implied warranty of
14 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 // General Public License for more details.
17 // You should have received a copy of the GNU General Public License
18 // along with this program; if not, write to the Free Software
19 // Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
22 // (Log is kept at end of this file)
36 #include <Scenery/obj.hxx>
37 #include <Scenery/scenery.hxx>
38 #include <Scenery/tilecache.hxx>
40 #include <Aircraft/aircraft.h>
41 #include <Bucket/bucketutils.h>
42 #include <Debug/fg_debug.h>
43 #include <Include/fg_constants.h>
44 #include <Include/fg_types.h>
45 #include <Main/options.hxx>
46 #include <Main/views.hxx>
47 #include <Math/mat3.h>
50 #define FG_LOCAL_X_Y 81 // max(o->tile_diameter) ** 2
53 // closest (potentially viewable) tiles, centered on current tile.
54 // This is an array of pointers to cache indexes.
55 int tiles[FG_LOCAL_X_Y];
58 // Initialize the Tile Manager subsystem
59 int fgTileMgrInit( void ) {
60 fgPrintf( FG_TERRAIN, FG_INFO, "Initializing Tile Manager subsystem.\n");
66 void fgTileMgrLoadTile( struct fgBUCKET *p, int *index) {
69 c = &global_tile_cache;
71 fgPrintf( FG_TERRAIN, FG_DEBUG, "Updating for bucket %d %d %d %d\n",
72 p->lon, p->lat, p->x, p->y);
74 // if not in cache, load tile into the next available slot
75 if ( (*index = c->Exists(p)) < 0 ) {
76 *index = c->NextAvail();
77 c->EntryFillIn(*index, p);
80 fgPrintf( FG_TERRAIN, FG_DEBUG, "Selected cache index of %d\n", *index);
84 // given the current lon/lat, fill in the array of local chunks. If
85 // the chunk isn't already in the cache, then read it from disk.
86 int fgTileMgrUpdate( void ) {
90 struct fgBUCKET p1, p2;
91 static struct fgBUCKET p_last = {-1000, 0, 0, 0};
94 c = &global_tile_cache;
95 f = current_aircraft.flight;
98 fgBucketFind(FG_Longitude * RAD_TO_DEG, FG_Latitude * RAD_TO_DEG, &p1);
99 dw = o->tile_diameter / 2;
100 dh = o->tile_diameter / 2;
102 if ( (p1.lon == p_last.lon) && (p1.lat == p_last.lat) &&
103 (p1.x == p_last.x) && (p1.y == p_last.y) ) {
104 // same bucket as last time
105 fgPrintf( FG_TERRAIN, FG_DEBUG, "Same bucket as last time\n");
106 } else if ( p_last.lon == -1000 ) {
107 // First time through, initialize the system and load all
110 fgPrintf( FG_TERRAIN, FG_INFO, " First time through ... ");
111 fgPrintf( FG_TERRAIN, FG_INFO, " Updating Tile list for %d,%d %d,%d\n",
112 p1.lon, p1.lat, p1.x, p1.y);
113 fgPrintf( FG_TERRAIN, FG_INFO, " Loading %d tiles\n",
114 o->tile_diameter * o->tile_diameter);
116 // wipe/initialize tile cache
119 // build the local area list and update cache
120 for ( j = 0; j < o->tile_diameter; j++ ) {
121 for ( i = 0; i < o->tile_diameter; i++ ) {
122 fgBucketOffset(&p1, &p2, i - dw, j - dh);
123 fgTileMgrLoadTile(&p2, &tiles[(j*o->tile_diameter) + i]);
127 // We've moved to a new bucket, we need to scroll our
128 // structures, and load in the new tiles
130 // CURRENTLY THIS ASSUMES WE CAN ONLY MOVE TO ADJACENT TILES.
131 // AT ULTRA HIGH SPEEDS THIS ASSUMPTION MAY NOT BE VALID IF
132 // THE AIRCRAFT CAN SKIP A TILE IN A SINGLE ITERATION.
134 fgPrintf( FG_TERRAIN, FG_INFO, "Updating Tile list for %d,%d %d,%d\n",
135 p1.lon, p1.lat, p1.x, p1.y);
137 if ( (p1.lon > p_last.lon) ||
138 ( (p1.lon == p_last.lon) && (p1.x > p_last.x) ) ) {
139 fgPrintf( FG_TERRAIN, FG_INFO, " Loading %d tiles\n",
141 for ( j = 0; j < o->tile_diameter; j++ ) {
143 for ( i = 0; i < o->tile_diameter - 1; i++ ) {
144 tiles[(j*o->tile_diameter) + i] =
145 tiles[(j*o->tile_diameter) + i + 1];
147 // load in new column
148 fgBucketOffset(&p_last, &p2, dw + 1, j - dh);
149 fgTileMgrLoadTile(&p2, &tiles[(j*o->tile_diameter) +
150 o->tile_diameter - 1]);
152 } else if ( (p1.lon < p_last.lon) ||
153 ( (p1.lon == p_last.lon) && (p1.x < p_last.x) ) ) {
154 fgPrintf( FG_TERRAIN, FG_INFO, " Loading %d tiles\n",
156 for ( j = 0; j < o->tile_diameter; j++ ) {
158 for ( i = o->tile_diameter - 1; i > 0; i-- ) {
159 tiles[(j*o->tile_diameter) + i] =
160 tiles[(j*o->tile_diameter) + i - 1];
162 // load in new column
163 fgBucketOffset(&p_last, &p2, -dw - 1, j - dh);
164 fgTileMgrLoadTile(&p2, &tiles[(j*o->tile_diameter) + 0]);
168 if ( (p1.lat > p_last.lat) ||
169 ( (p1.lat == p_last.lat) && (p1.y > p_last.y) ) ) {
170 fgPrintf( FG_TERRAIN, FG_INFO, " Loading %d tiles\n",
172 for ( i = 0; i < o->tile_diameter; i++ ) {
174 for ( j = 0; j < o->tile_diameter - 1; j++ ) {
175 tiles[(j * o->tile_diameter) + i] =
176 tiles[((j+1) * o->tile_diameter) + i];
178 // load in new column
179 fgBucketOffset(&p_last, &p2, i - dw, dh + 1);
180 fgTileMgrLoadTile(&p2, &tiles[((o->tile_diameter-1) *
181 o->tile_diameter) + i]);
183 } else if ( (p1.lat < p_last.lat) ||
184 ( (p1.lat == p_last.lat) && (p1.y < p_last.y) ) ) {
185 fgPrintf( FG_TERRAIN, FG_INFO, " Loading %d tiles\n",
187 for ( i = 0; i < o->tile_diameter; i++ ) {
189 for ( j = o->tile_diameter - 1; j > 0; j-- ) {
190 tiles[(j * o->tile_diameter) + i] =
191 tiles[((j-1) * o->tile_diameter) + i];
193 // load in new column
194 fgBucketOffset(&p_last, &p2, i - dw, -dh - 1);
195 fgTileMgrLoadTile(&p2, &tiles[0 + i]);
207 // Calculate if point/radius is inside view frustum
208 static int viewable( fgCartesianPoint3d *cp, double radius ) {
211 int viewable = 1; // start by assuming it's viewable
212 double x0, x1, y1, slope;
216 MAT3_SET_HVEC(world, cp->x, cp->y, cp->z, 1.0);
217 MAT3mult_vec(eye, world, v->WORLD_TO_EYE);
218 // printf( "\nworld -> eye = %.2f %.2f %.2f radius = %.2f\n",
219 // eye[0], eye[1], eye[2], radius);
221 // Check near clip plane
222 if ( eye[2] - radius > 0.0 ) {
226 // check right clip plane (from eye perspective)
227 // y = m * (x - x0) = equation of a line intercepting X axis at x0
228 x1 = v->cos_fov_x * radius;
229 y1 = v->sin_fov_x * radius;
230 slope = -1.0 / v->slope_x;
231 x0 = x1 - y1 / slope;
233 // printf("(r) x1 = %.2f y1 = %.2f\n", x1, y1);
234 // printf("eye[0] = %.2f eye[2] = %.2f\n", eye[0], eye[2]);
235 // printf("(r) x0 = %.2f slope_x = %.2f radius = %.2f\n",
236 // x0, slope, radius);
238 if ( eye[2] > slope * (eye[0] - x0) ) {
242 // check left clip plane (from eye perspective)
245 x0 = x1 - y1 / slope;
247 // printf("(r) x1 = %.2f y1 = %.2f\n", x1, y1);
248 // printf("eye[0] = %.2f eye[2] = %.2f\n", eye[0], eye[2]);
249 // printf("(r) x0 = %.2f slope_x = %.2f radius = %.2f\n",
250 // x0, slope, radius);
252 if ( eye[2] > slope * (eye[0] - x0) ) {
256 // check bottom clip plane (from eye perspective)
257 x1 = -(v->cos_fov_y) * radius;
258 y1 = v->sin_fov_y * radius;
259 slope = 1.0 / v->slope_y;
260 x0 = x1 - y1 / slope;
262 // printf("(r) x1 = %.2f y1 = %.2f\n", x1, y1);
263 // printf("eye[1] = %.2f eye[2] = %.2f\n", eye[1], eye[2]);
264 // printf("(r) x0 = %.2f slope_y = %.2f radius = %.2f\n",
265 // x0, slope, radius);
267 if ( eye[2] > slope * (eye[1] - x0) ) {
271 // check top clip plane (from eye perspective)
274 x0 = x1 - y1 / slope;
276 // printf("(r) x1 = %.2f y1 = %.2f\n", x1, y1);
277 // printf("eye[1] = %.2f eye[2] = %.2f\n", eye[1], eye[2]);
278 // printf("(r) x0 = %.2f slope_y = %.2f radius = %.2f\n",
279 // x0, slope, radius);
281 if ( eye[2] > slope * (eye[1] - x0) ) {
289 // Render the local tiles
290 void fgTileMgrRender( void ) {
296 fgCartesianPoint3d local_ref, offset;
304 c = &global_tile_cache;
305 f = current_aircraft.flight;
306 o = ¤t_options;
309 // Find current translation offset
310 fgBucketFind(FG_Longitude * RAD_TO_DEG, FG_Latitude * RAD_TO_DEG, &p);
311 index = c->Exists(&p);
312 c->EntryInfo(index, &display_list, &scenery.next_center, &radius );
314 fgPrintf( FG_TERRAIN, FG_DEBUG,
315 "Pos = (%.2f, %.2f) Current bucket = %d %d %d %d Index = %ld\n",
316 FG_Longitude * RAD_TO_DEG, FG_Latitude * RAD_TO_DEG,
317 p.lon, p.lat, p.x, p.y, fgBucketGenIndex(&p) );
319 for ( i = 0; i < (o->tile_diameter * o->tile_diameter); i++ ) {
321 // fgPrintf( FG_TERRAIN, FG_DEBUG, "Index = %d\n", index);
322 c->EntryInfo(index, &display_list, &local_ref, &radius );
324 if ( display_list >= 0 ) {
326 offset.x = local_ref.x - scenery.center.x;
327 offset.y = local_ref.y - scenery.center.y;
328 offset.z = local_ref.z - scenery.center.z;
330 if ( viewable(&offset, radius) ) {
333 xglTranslatef(offset.x, offset.y, offset.z);
334 xglCallList(display_list);
342 v->vfc_ratio = (double)culled / (double)(drawn + culled);
343 // printf("drawn = %d culled = %d saved = %.2f\n", drawn, culled,
349 // Revision 1.11 1998/05/20 20:53:55 curt
350 // Moved global ref point and radius (bounding sphere info, and offset) to
351 // data file rather than calculating it on the fly.
352 // Fixed polygon winding problem in scenery generation stage rather than
353 // compensating for it on the fly.
354 // Made a fgTILECACHE class.
356 // Revision 1.10 1998/05/17 16:59:34 curt
357 // Frist pass at view frustum culling now operational.
359 // Revision 1.9 1998/05/16 13:09:58 curt
360 // Beginning to add support for view frustum culling.
361 // Added some temporary code to calculate bouding radius, until the
362 // scenery generation tools and scenery can be updated.
364 // Revision 1.8 1998/05/07 23:15:21 curt
365 // Fixed a glTexImage2D() usage bug where width and height were mis-swapped.
366 // Added support for --tile-radius=n option.
368 // Revision 1.7 1998/05/06 03:16:42 curt
369 // Added an option to control square tile radius.
371 // Revision 1.6 1998/05/02 01:52:18 curt
372 // Playing around with texture coordinates.
374 // Revision 1.5 1998/04/30 12:35:32 curt
375 // Added a command line rendering option specify smooth/flat shading.
377 // Revision 1.4 1998/04/27 03:30:14 curt
378 // Minor transformation adjustments to try to keep scenery tiles closer to
379 // (0, 0, 0) GLfloats run out of precision at the distances we need to model
380 // the earth, but we can do a bunch of pre-transformations using double math
381 // and then cast to GLfloat once everything is close in where we have less
382 // precision problems.
384 // Revision 1.3 1998/04/25 22:06:32 curt
385 // Edited cvs log messages in source files ... bad bad bad!
387 // Revision 1.2 1998/04/24 00:51:09 curt
388 // Wrapped "#include <config.h>" in "#ifdef HAVE_CONFIG_H"
389 // Tweaked the scenery file extentions to be "file.obj" (uncompressed)
390 // or "file.obz" (compressed.)
392 // Revision 1.1 1998/04/22 13:22:48 curt
393 // C++ - ifing the code a bit.
395 // Revision 1.25 1998/04/18 04:14:07 curt
396 // Moved fg_debug.c to it's own library.
398 // Revision 1.24 1998/04/14 02:23:18 curt
399 // Code reorganizations. Added a Lib/ directory for more general libraries.
401 // Revision 1.23 1998/04/08 23:30:08 curt
402 // Adopted Gnu automake/autoconf system.
404 // Revision 1.22 1998/04/03 22:11:38 curt
405 // Converting to Gnu autoconf system.
407 // Revision 1.21 1998/03/23 21:23:05 curt
408 // Debugging output tweaks.
410 // Revision 1.20 1998/03/14 00:30:51 curt
411 // Beginning initial terrain texturing experiments.
413 // Revision 1.19 1998/02/20 00:16:25 curt
414 // Thursday's tweaks.
416 // Revision 1.18 1998/02/19 13:05:54 curt
417 // Incorporated some HUD tweaks from Michelle America.
418 // Tweaked the sky's sunset/rise colors.
419 // Other misc. tweaks.
421 // Revision 1.17 1998/02/16 13:39:46 curt
422 // Miscellaneous weekend tweaks. Fixed? a cache problem that caused whole
423 // tiles to occasionally be missing.
425 // Revision 1.16 1998/02/12 21:59:53 curt
426 // Incorporated code changes contributed by Charlie Hotchkiss
427 // <chotchkiss@namg.us.anritsu.com>
429 // Revision 1.14 1998/02/09 21:30:19 curt
430 // Fixed a nagging problem with terrain tiles not "quite" matching up perfectly.
432 // Revision 1.13 1998/02/07 15:29:46 curt
433 // Incorporated HUD changes and struct/typedef changes from Charlie Hotchkiss
434 // <chotchkiss@namg.us.anritsu.com>
436 // Revision 1.12 1998/02/01 03:39:55 curt
439 // Revision 1.11 1998/01/31 00:43:27 curt
440 // Added MetroWorks patches from Carmen Volpe.
442 // Revision 1.10 1998/01/29 00:51:40 curt
443 // First pass at tile cache, dynamic tile loading and tile unloading now works.
445 // Revision 1.9 1998/01/27 03:26:44 curt
446 // Playing with new fgPrintf command.
448 // Revision 1.8 1998/01/27 00:48:04 curt
449 // Incorporated Paul Bleisch's <pbleisch@acm.org> new debug message
450 // system and commandline/config file processing code.
452 // Revision 1.7 1998/01/26 15:55:25 curt
453 // Progressing on building dynamic scenery system.
455 // Revision 1.6 1998/01/24 00:03:30 curt
458 // Revision 1.5 1998/01/19 19:27:18 curt
459 // Merged in make system changes from Bob Kuehne <rpk@sgi.com>
460 // This should simplify things tremendously.
462 // Revision 1.4 1998/01/19 18:40:38 curt
463 // Tons of little changes to clean up the code and to remove fatal errors
464 // when building with the c++ compiler.
466 // Revision 1.3 1998/01/13 00:23:11 curt
467 // Initial changes to support loading and management of scenery tiles. Note,
468 // there's still a fair amount of work left to be done.
470 // Revision 1.2 1998/01/08 02:22:27 curt
471 // Continue working on basic features.
473 // Revision 1.1 1998/01/07 23:50:51 curt
474 // "area" renamed to "tile"
476 // Revision 1.2 1998/01/07 03:29:29 curt
477 // Given an arbitrary lat/lon, we can now:
478 // generate a unique index for the chunk containing the lat/lon
479 // generate a path name to the chunk file
480 // build a list of the indexes of all the nearby areas.
482 // Revision 1.1 1998/01/07 02:05:48 curt