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 - http://www.flightgear.org/~curt
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.
30 #include <simgear/constants.h>
31 #include <simgear/debug/logstream.hxx>
32 #include <simgear/math/point3d.hxx>
33 #include <simgear/math/polar3d.hxx>
34 #include <simgear/math/sg_geodesy.hxx>
35 #include <simgear/math/vector.hxx>
36 #include <simgear/structure/exception.hxx>
37 #include <simgear/scene/model/modellib.hxx>
38 #include <simgear/scene/model/shadowvolume.hxx>
40 #include <Main/globals.hxx>
41 #include <Main/fg_props.hxx>
42 #include <Main/viewer.hxx>
44 #include "newcache.hxx"
45 #include "scenery.hxx"
46 #include "tilemgr.hxx"
48 #define TEST_LAST_HIT_CACHE
50 #if defined(ENABLE_THREADS) && ENABLE_THREADS
51 SGLockedQueue<FGTileEntry *> FGTileMgr::attach_queue;
52 SGLockedQueue<FGDeferredModel *> FGTileMgr::model_queue;
54 queue<FGTileEntry *> FGTileMgr::attach_queue;
55 queue<FGDeferredModel *> FGTileMgr::model_queue;
56 #endif // ENABLE_THREADS
57 queue<FGTileEntry *> FGTileMgr::delete_queue;
59 bool FGTileMgr::tile_filter = true;
61 extern SGShadowVolume *shadows;
64 FGTileMgr::FGTileMgr():
73 FGTileMgr::~FGTileMgr() {
77 // Initialize the Tile Manager subsystem
78 int FGTileMgr::init() {
79 SG_LOG( SG_TERRAIN, SG_INFO, "Initializing Tile Manager subsystem." );
85 // instead it's just a lot easier to let any pending work flush
86 // through, rather than trying to arrest the queue and nuke all
87 // the various work at all the various stages and get everything
88 // cleaned up properly.
90 while ( ! attach_queue.empty() ) {
94 while ( ! model_queue.empty() ) {
95 #if defined(ENABLE_THREADS) && ENABLE_THREADS
96 FGDeferredModel* dm = model_queue.pop();
98 FGDeferredModel* dm = model_queue.front();
110 previous_bucket.make_bad();
111 current_bucket.make_bad();
113 longitude = latitude = -1000.0;
119 // schedule a tile for loading
120 void FGTileMgr::sched_tile( const SGBucket& b, const bool is_inner_ring ) {
121 // see if tile already exists in the cache
122 FGTileEntry *t = tile_cache.get_tile( b );
125 // make space in the cache
126 while ( (int)tile_cache.get_size() > tile_cache.get_max_cache_size() ) {
127 long index = tile_cache.get_oldest_tile();
129 FGTileEntry *old = tile_cache.get_tile( index );
130 shadows->deleteOccluderFromTile( (ssgBranch *) old->get_terra_transform() );
131 old->disconnect_ssg_nodes();
132 delete_queue.push( old );
133 tile_cache.clear_entry( index );
135 // nothing to free ?!? forge ahead
140 // create a new entry
141 FGTileEntry *e = new FGTileEntry( b );
143 // insert the tile into the cache
144 if ( tile_cache.insert_tile( e ) ) {
145 // Schedule tile for loading
148 // insert failed (cache full with no available entries to
149 // delete.) Try again later
153 t->set_inner_ring( is_inner_ring );
158 // schedule a needed buckets for loading
159 void FGTileMgr::schedule_needed( double vis, SGBucket curr_bucket) {
160 // sanity check (unfortunately needed!)
161 if ( longitude < -180.0 || longitude > 180.0
162 || latitude < -90.0 || latitude > 90.0 )
164 SG_LOG( SG_TERRAIN, SG_ALERT,
165 "Attempting to schedule tiles for bogus lon and lat = ("
166 << longitude << "," << latitude << ")" );
167 SG_LOG( SG_TERRAIN, SG_ALERT,
168 "This is a FATAL error. Exiting!" );
172 SG_LOG( SG_TERRAIN, SG_INFO,
173 "scheduling needed tiles for " << longitude << " " << latitude );
175 // vis = fgGetDouble("/environment/visibility-m");
177 double tile_width = curr_bucket.get_width_m();
178 double tile_height = curr_bucket.get_height_m();
179 // cout << "tile width = " << tile_width << " tile_height = "
180 // << tile_height << endl;
182 xrange = (int)(vis / tile_width) + 1;
183 yrange = (int)(vis / tile_height) + 1;
184 if ( xrange < 1 ) { xrange = 1; }
185 if ( yrange < 1 ) { yrange = 1; }
187 // note * 2 at end doubles cache size (for fdm and viewer)
188 tile_cache.set_max_cache_size( (2*xrange + 2) * (2*yrange + 2) * 2 );
189 // cout << "xrange = " << xrange << " yrange = " << yrange << endl;
190 // cout << "max cache size = " << tile_cache.get_max_cache_size()
191 // << " current cache size = " << tile_cache.get_size() << endl;
193 // clear the inner ring flags so we can set them below. This
194 // prevents us from having "true" entries we aren't able to find
195 // to get rid of if we teleport a long ways away from the current
197 tile_cache.clear_inner_ring_flags();
201 // schedule center tile first so it can be loaded first
202 b = sgBucketOffset( longitude, latitude, 0, 0 );
203 sched_tile( b, true );
207 // schedule next ring of 8 tiles
208 for ( x = -1; x <= 1; ++x ) {
209 for ( y = -1; y <= 1; ++y ) {
210 if ( x != 0 || y != 0 ) {
211 b = sgBucketOffset( longitude, latitude, x, y );
212 sched_tile( b, true );
217 // schedule remaining tiles
218 for ( x = -xrange; x <= xrange; ++x ) {
219 for ( y = -yrange; y <= yrange; ++y ) {
220 if ( x < -1 || x > 1 || y < -1 || y > 1 ) {
221 SGBucket b = sgBucketOffset( longitude, latitude, x, y );
222 sched_tile( b, false );
229 void FGTileMgr::initialize_queue()
231 // First time through or we have teleported, initialize the
232 // system and load all relavant tiles
234 SG_LOG( SG_TERRAIN, SG_INFO, "Initialize_queue(): Updating Tile list for "
236 // cout << "tile cache size = " << tile_cache.get_size() << endl;
238 // wipe/initialize tile cache
239 // tile_cache.init();
240 previous_bucket.make_bad();
242 // build the local area list and schedule tiles for loading
244 // start with the center tile and work out in concentric
247 double visibility_meters = fgGetDouble("/environment/visibility-m");
248 schedule_needed(visibility_meters, current_bucket);
250 // do we really want to lose this? CLO
252 // Now force a load of the center tile and inner ring so we
253 // have something to see in our first frame.
255 for ( i = 0; i < 9; ++i ) {
256 if ( load_queue.size() ) {
257 SG_LOG( SG_TERRAIN, SG_DEBUG,
258 "Load queue not empty, loading a tile" );
260 SGBucket pending = load_queue.front();
261 load_queue.pop_front();
262 load_tile( pending );
269 * return current status of queues
273 bool FGTileMgr::all_queues_empty() {
274 return attach_queue.empty() && model_queue.empty();
279 * Update the various queues maintained by the tilemagr (private
280 * internal function, do not call directly.)
282 void FGTileMgr::update_queues()
284 // load the next model in the load queue. Currently this must
285 // happen in the render thread because model loading can trigger
286 // texture loading which involves use of the opengl api. Skip any
287 // models belonging to not loaded tiles (i.e. the tile was removed
288 // before we were able to load some of the associated models.)
289 if ( !model_queue.empty() ) {
290 bool processed_one = false;
292 while ( model_queue.size() > 200 || processed_one == false ) {
293 processed_one = true;
295 if ( model_queue.size() > 200 ) {
296 SG_LOG( SG_TERRAIN, SG_INFO,
297 "Alert: catching up on model load queue" );
300 // cout << "loading next model ..." << endl;
301 // load the next tile in the queue
302 #if defined(ENABLE_THREADS) && ENABLE_THREADS
303 FGDeferredModel* dm = model_queue.pop();
305 FGDeferredModel* dm = model_queue.front();
309 // only load the model if the tile still exists in the
311 FGTileEntry *t = tile_cache.get_tile( dm->get_bucket() );
313 ssgTexturePath( (char *)(dm->get_texture_path().c_str()) );
315 ssgEntity *obj_model =
316 globals->get_model_lib()->load_model( ".",
317 dm->get_model_path(),
318 globals->get_props(),
319 globals->get_sim_time_sec() );
320 if ( obj_model != NULL ) {
321 dm->get_obj_trans()->addKid( obj_model );
322 shadows->addOccluder( (ssgBranch *) obj_model->getParent(0),
323 SGShadowVolume::occluderTypeTileObject,
324 (ssgBranch *) dm->get_tile()->get_terra_transform());
326 } catch (const sg_exception& exc) {
327 SG_LOG( SG_ALL, SG_ALERT, exc.getMessage() );
330 dm->get_tile()->dec_pending_models();
336 // Notify the tile loader that it can load another tile
339 if ( !attach_queue.empty() ) {
340 #if defined(ENABLE_THREADS) && ENABLE_THREADS
341 FGTileEntry* e = attach_queue.pop();
343 FGTileEntry* e = attach_queue.front();
346 e->add_ssg_nodes( globals->get_scenery()->get_terrain_branch(),
347 globals->get_scenery()->get_gnd_lights_root(),
348 globals->get_scenery()->get_vasi_lights_root(),
349 globals->get_scenery()->get_rwy_lights_root(),
350 globals->get_scenery()->get_taxi_lights_root() );
351 // cout << "Adding ssg nodes for "
354 if ( !delete_queue.empty() ) {
355 // cout << "delete queue = " << delete_queue.size() << endl;
356 bool processed_one = false;
358 while ( delete_queue.size() > 30 || processed_one == false ) {
359 processed_one = true;
361 if ( delete_queue.size() > 30 ) {
362 // uh oh, delete queue is blowing up, we aren't clearing
363 // it fast enough. Let's just panic, well not panic, but
364 // get real serious and agressively free up some tiles so
365 // we don't explode our memory usage.
367 SG_LOG( SG_TERRAIN, SG_WARN,
368 "Warning: catching up on tile delete queue" );
371 FGTileEntry* e = delete_queue.front();
372 if ( e->free_tile() ) {
381 // given the current lon/lat (in degrees), fill in the array of local
382 // chunks. If the chunk isn't already in the cache, then read it from
384 int FGTileMgr::update( double visibility_meters )
386 SGLocation *location = globals->get_current_view()->getSGLocation();
387 return update( location, visibility_meters );
391 int FGTileMgr::update( SGLocation *location, double visibility_meters )
393 SG_LOG( SG_TERRAIN, SG_DEBUG, "FGTileMgr::update()" );
395 longitude = location->getLongitude_deg();
396 latitude = location->getLatitude_deg();
397 // add 1.0m to the max altitude to give a little leeway to the
398 // ground reaction code.
399 altitude_m = location->getAltitudeASL_ft() * SG_FEET_TO_METER + 1.0;
401 // if current altitude is apparently not initialized, set max
402 // altitude to something big.
403 if ( altitude_m < -1000 ) {
406 // SG_LOG( SG_TERRAIN, SG_DEBUG, "FGTileMgr::update() for "
407 // << longitude << " " << latatitude );
409 current_bucket.set_bucket( longitude, latitude );
410 // SG_LOG( SG_TERRAIN, SG_DEBUG, "Updating tile list for "
411 // << current_bucket );
412 fgSetInt( "/environment/current-tile-id", current_bucket.gen_index() );
414 // do tile load scheduling.
415 // Note that we need keep track of both viewer buckets and fdm buckets.
416 if ( state == Running ) {
417 SG_LOG( SG_TERRAIN, SG_DEBUG, "State == Running" );
418 if (!(current_bucket == previous_bucket )) {
419 // We've moved to a new bucket, we need to schedule any
420 // needed tiles for loading.
421 SG_LOG( SG_TERRAIN, SG_INFO, "FGTileMgr::update()" );
422 schedule_needed(visibility_meters, current_bucket);
424 } else if ( state == Start || state == Inited ) {
425 SG_LOG( SG_TERRAIN, SG_INFO, "State == Start || Inited" );
426 // initialize_queue();
429 // load the next tile in the load queue (or authorize the next
430 // load in the case of the threaded tile pager)
437 previous_bucket = current_bucket;
443 // timer event driven call to scheduler for the purpose of refreshing the tile timestamps
444 void FGTileMgr::refresh_view_timestamps() {
445 SG_LOG( SG_TERRAIN, SG_INFO,
446 "Refreshing timestamps for " << current_bucket.get_center_lon()
447 << " " << current_bucket.get_center_lat() );
448 if ( longitude >= -180.0 && longitude <= 180.0
449 && latitude >= -90.0 && latitude <= 90.0 )
451 schedule_needed(fgGetDouble("/environment/visibility-m"), current_bucket);
455 void FGTileMgr::prep_ssg_nodes( SGLocation *location, float vis ) {
457 // traverse the potentially viewable tile list and update range
458 // selector and transform
460 float *up = location->get_world_up();
463 tile_cache.reset_traversal();
465 const double *vp = location->get_absolute_view_pos();
466 Point3D viewpos(vp[0], vp[1], vp[2]);
467 while ( ! tile_cache.at_end() ) {
468 // cout << "processing a tile" << endl;
469 if ( (e = tile_cache.get_current()) ) {
470 e->prep_ssg_node( viewpos, up, vis);
472 SG_LOG(SG_INPUT, SG_ALERT, "warning ... empty tile in cache");
478 bool FGTileMgr::set_tile_filter( bool f ) {
479 bool old = tile_filter;
484 int FGTileMgr::tile_filter_cb( ssgEntity *, int )
486 return tile_filter ? 1 : 0;
489 bool FGTileMgr::scenery_available(double lat, double lon, double range_m)
491 // sanity check (unfortunately needed!)
492 if ( lon < -180.0 || lon > 180.0 || lat < -90.0 || lat > 90.0 )
495 SGBucket bucket(lon, lat);
496 FGTileEntry *te = tile_cache.get_tile(bucket);
497 if (!te || !te->is_loaded())
500 // Traverse all tiles required to be there for the given visibility.
501 // This uses exactly the same algorithm like the tile scheduler.
502 double tile_width = bucket.get_width_m();
503 double tile_height = bucket.get_height_m();
505 int xrange = (int)fabs(range_m / tile_width) + 1;
506 int yrange = (int)fabs(range_m / tile_height) + 1;
508 for ( int x = -xrange; x <= xrange; ++x ) {
509 for ( int y = -yrange; y <= yrange; ++y ) {
510 // We have already checked for the center tile.
511 if ( x != 0 || y != 0 ) {
512 SGBucket b = sgBucketOffset( lon, lat, x, y );
513 FGTileEntry *te = tile_cache.get_tile(b);
514 if (!te || !te->is_loaded())
520 // Survived all tests.