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.
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>
39 #include <Main/globals.hxx>
40 #include <Main/fg_props.hxx>
41 #include <Main/viewer.hxx>
43 #include "newcache.hxx"
44 #include "scenery.hxx"
45 #include "tilemgr.hxx"
47 #define TEST_LAST_HIT_CACHE
50 SGLockedQueue<FGTileEntry *> FGTileMgr::attach_queue;
51 SGLockedQueue<FGDeferredModel *> FGTileMgr::model_queue;
53 queue<FGTileEntry *> FGTileMgr::attach_queue;
54 queue<FGDeferredModel *> FGTileMgr::model_queue;
55 #endif // ENABLE_THREADS
56 queue<FGTileEntry *> FGTileMgr::delete_queue;
60 FGTileMgr::FGTileMgr():
70 FGTileMgr::~FGTileMgr() {
74 // Initialize the Tile Manager subsystem
75 int FGTileMgr::init() {
76 SG_LOG( SG_TERRAIN, SG_INFO, "Initializing Tile Manager subsystem." );
82 // instead it's just a lot easier to let any pending work flush
83 // through, rather than trying to arrest the queue and nuke all
84 // the various work at all the various stages and get everything
85 // cleaned up properly.
87 while ( ! attach_queue.empty() ) {
91 while ( ! model_queue.empty() ) {
93 FGDeferredModel* dm = model_queue.pop();
95 FGDeferredModel* dm = model_queue.front();
107 previous_bucket.make_bad();
108 current_bucket.make_bad();
110 longitude = latitude = -1000.0;
116 // schedule a tile for loading
117 void FGTileMgr::sched_tile( const SGBucket& b, const bool is_inner_ring ) {
118 // see if tile already exists in the cache
119 FGTileEntry *t = tile_cache.get_tile( b );
122 // make space in the cache
123 while ( (int)tile_cache.get_size() > tile_cache.get_max_cache_size() ) {
124 long index = tile_cache.get_oldest_tile();
126 FGTileEntry *old = tile_cache.get_tile( index );
127 old->disconnect_ssg_nodes();
128 delete_queue.push( old );
129 tile_cache.clear_entry( index );
131 // nothing to free ?!? forge ahead
136 // create a new entry
137 FGTileEntry *e = new FGTileEntry( b );
139 // insert the tile into the cache
140 if ( tile_cache.insert_tile( e ) ) {
141 // Schedule tile for loading
144 // insert failed (cache full with no available entries to
145 // delete.) Try again later
149 t->set_inner_ring( is_inner_ring );
154 // schedule a needed buckets for loading
155 void FGTileMgr::schedule_needed( double vis, SGBucket curr_bucket) {
156 // sanity check (unfortunately needed!)
157 if ( longitude < -180.0 || longitude > 180.0
158 || latitude < -90.0 || latitude > 90.0 )
160 SG_LOG( SG_TERRAIN, SG_ALERT,
161 "Attempting to schedule tiles for bogus lon and lat = ("
162 << longitude << "," << latitude << ")" );
163 SG_LOG( SG_TERRAIN, SG_ALERT,
164 "This is a FATAL error. Exiting!" );
168 SG_LOG( SG_TERRAIN, SG_INFO,
169 "scheduling needed tiles for " << longitude << " " << latitude );
171 // vis = fgGetDouble("/environment/visibility-m");
173 double tile_width = curr_bucket.get_width_m();
174 double tile_height = curr_bucket.get_height_m();
175 // cout << "tile width = " << tile_width << " tile_height = "
176 // << tile_height !<< endl;
178 xrange = (int)(vis / tile_width) + 1;
179 yrange = (int)(vis / tile_height) + 1;
180 if ( xrange < 1 ) { xrange = 1; }
181 if ( yrange < 1 ) { yrange = 1; }
183 // note * 2 at end doubles cache size (for fdm and viewer)
184 tile_cache.set_max_cache_size( (2*xrange + 2) * (2*yrange + 2) * 2 );
186 cout << "xrange = " << xrange << " yrange = " << yrange << endl;
187 cout << "max cache size = " << tile_cache.get_max_cache_size()
188 << " current cache size = " << tile_cache.get_size() << endl;
191 // clear the inner ring flags so we can set them below. This
192 // prevents us from having "true" entries we aren't able to find
193 // to get rid of if we teleport a long ways away from the current
195 tile_cache.clear_inner_ring_flags();
199 // schedule center tile first so it can be loaded first
200 b = sgBucketOffset( longitude, latitude, 0, 0 );
201 sched_tile( b, true );
205 // schedule next ring of 8 tiles
206 for ( x = -1; x <= 1; ++x ) {
207 for ( y = -1; y <= 1; ++y ) {
208 if ( x != 0 || y != 0 ) {
209 b = sgBucketOffset( longitude, latitude, x, y );
210 sched_tile( b, true );
215 // schedule remaining tiles
216 for ( x = -xrange; x <= xrange; ++x ) {
217 for ( y = -yrange; y <= yrange; ++y ) {
218 if ( x < -1 || x > 1 || y < -1 || y > 1 ) {
219 SGBucket b = sgBucketOffset( longitude, latitude, x, y );
220 sched_tile( b, false );
227 void FGTileMgr::initialize_queue()
229 // First time through or we have teleported, initialize the
230 // system and load all relavant tiles
232 SG_LOG( SG_TERRAIN, SG_INFO, "Updating Tile list for " << current_bucket );
233 // cout << "tile cache size = " << tile_cache.get_size() << endl;
235 // wipe/initialize tile cache
236 // tile_cache.init();
237 previous_bucket.make_bad();
239 // build the local area list and schedule tiles for loading
241 // start with the center tile and work out in concentric
244 double visibility_meters = fgGetDouble("/environment/visibility-m");
245 schedule_needed(visibility_meters, current_bucket);
247 // do we really want to lose this? CLO
249 // Now force a load of the center tile and inner ring so we
250 // have something to see in our first frame.
252 for ( i = 0; i < 9; ++i ) {
253 if ( load_queue.size() ) {
254 SG_LOG( SG_TERRAIN, SG_DEBUG,
255 "Load queue not empty, loading a tile" );
257 SGBucket pending = load_queue.front();
258 load_queue.pop_front();
259 load_tile( pending );
267 * Update the various queues maintained by the tilemagr (private
268 * internal function, do not call directly.)
270 void FGTileMgr::update_queues()
272 // load the next model in the load queue. Currently this must
273 // happen in the render thread because model loading can trigger
274 // texture loading which involves use of the opengl api.
275 if ( !model_queue.empty() ) {
276 // cout << "loading next model ..." << endl;
277 // load the next tile in the queue
278 #ifdef ENABLE_THREADS
279 FGDeferredModel* dm = model_queue.pop();
281 FGDeferredModel* dm = model_queue.front();
285 ssgTexturePath( (char *)(dm->get_texture_path().c_str()) );
288 ssgEntity *obj_model =
289 globals->get_model_lib()->load_model( ".",
290 dm->get_model_path(),
291 globals->get_props(),
292 globals->get_sim_time_sec() );
293 if ( obj_model != NULL ) {
294 dm->get_obj_trans()->addKid( obj_model );
297 catch (const sg_exception& exc)
299 SG_LOG( SG_ALL, SG_ALERT, exc.getMessage() );
302 dm->get_tile()->dec_pending_models();
306 // cout << "current elevation (ssg) == " << scenery.get_cur_elev() << endl;
308 // activate loader thread one out of every 5 frames
309 if ( counter_hack == 0 ) {
310 // Notify the tile loader that it can load another tile
313 counter_hack = (counter_hack + 1) % 5;
316 if ( !attach_queue.empty() ) {
317 #ifdef ENABLE_THREADS
318 FGTileEntry* e = attach_queue.pop();
320 FGTileEntry* e = attach_queue.front();
323 e->add_ssg_nodes( globals->get_scenery()->get_terrain_branch(),
324 globals->get_scenery()->get_gnd_lights_root(),
325 globals->get_scenery()->get_vasi_lights_root(),
326 globals->get_scenery()->get_rwy_lights_root(),
327 globals->get_scenery()->get_taxi_lights_root() );
328 // cout << "Adding ssg nodes for "
331 if ( !delete_queue.empty() ) {
332 // cout << "delete queue = " << delete_queue.size() << endl;
334 while ( delete_queue.size() > 30 ) {
335 // uh oh, delete queue is blowing up, we aren't clearing
336 // it fast enough. Let's just panic, well not panic, but
337 // get real serious and agressively free up some tiles so
338 // we don't explode our memory usage.
340 SG_LOG( SG_TERRAIN, SG_ALERT,
341 "Alert: catching up on tile delete queue" );
343 FGTileEntry* e = delete_queue.front();
344 while ( !e->free_tile() );
349 FGTileEntry* e = delete_queue.front();
350 if ( e->free_tile() ) {
358 // given the current lon/lat (in degrees), fill in the array of local
359 // chunks. If the chunk isn't already in the cache, then read it from
361 int FGTileMgr::update( double visibility_meters )
363 SGLocation *location = globals->get_current_view()->getSGLocation();
364 sgdVec3 abs_pos_vector;
365 sgdCopyVec3( abs_pos_vector,
366 globals->get_current_view()->get_absolute_view_pos() );
367 return update( location, visibility_meters, abs_pos_vector );
371 int FGTileMgr::update( SGLocation *location, double visibility_meters,
372 sgdVec3 abs_pos_vector )
374 longitude = location->getLongitude_deg();
375 latitude = location->getLatitude_deg();
376 // add 1.0m to the max altitude to give a little leeway to the
377 // ground reaction code.
378 altitude_m = location->getAltitudeASL_ft() * SG_FEET_TO_METER + 1.0;
380 // if current altitude is apparently not initialized, set max
381 // altitude to something big.
382 if ( altitude_m < -1000 ) {
385 // SG_LOG( SG_TERRAIN, SG_DEBUG, "FGTileMgr::update() for "
386 // << longitude << " " << latatitude );
388 current_bucket.set_bucket( longitude, latitude );
389 // SG_LOG( SG_TERRAIN, SG_DEBUG, "Updating tile list for "
390 // << current_bucket );
391 fgSetInt( "/environment/current-tile-id", current_bucket.gen_index() );
393 // set global scenery center from current tile center
394 current_tile = tile_cache.get_tile( current_bucket );
395 if ( current_tile != NULL ) {
396 globals->get_scenery()->set_next_center( current_tile->center );
398 SG_LOG( SG_TERRAIN, SG_WARN, "Tile not found (Ok if initializing)" );
399 globals->get_scenery()->set_next_center( Point3D(0.0) );
402 // do tile load scheduling.
403 // Note that we need keep track of both viewer buckets and fdm buckets.
404 if ( state == Running ) {
405 SG_LOG( SG_TERRAIN, SG_DEBUG, "State == Running" );
406 if (!(current_bucket == previous_bucket )) {
407 // We've moved to a new bucket, we need to schedule any
408 // needed tiles for loading.
409 schedule_needed(visibility_meters, current_bucket);
411 } else if ( state == Start || state == Inited ) {
412 SG_LOG( SG_TERRAIN, SG_INFO, "State == Start || Inited" );
416 // load the next tile in the load queue (or authorize the next
417 // load in the case of the threaded tile pager)
424 previous_bucket = current_bucket;
426 updateCurrentElevAtPos( abs_pos_vector, altitude_m,
427 location->get_tile_center() );
433 // timer event driven call to scheduler for the purpose of refreshing the tile timestamps
434 void FGTileMgr::refresh_view_timestamps() {
435 SG_LOG( SG_TERRAIN, SG_INFO,
436 "Refreshing timestamps for " << current_bucket.get_center_lon()
437 << " " << current_bucket.get_center_lat() );
438 schedule_needed(fgGetDouble("/environment/visibility-m"), current_bucket);
442 int FGTileMgr::updateCurrentElevAtPos( sgdVec3 abs_pos_vector,
448 sgdSetVec3( sc, center[0], center[1], center[2]);
450 // overridden with actual values if a terrain intersection is
452 double hit_elev = -9999.0;
453 double hit_radius = 0.0;
454 sgdVec3 hit_normal = { 0.0, 0.0, 0.0 };
457 if ( fabs(sc[0]) > 1.0 || fabs(sc[1]) > 1.0 || fabs(sc[2]) > 1.0 ) {
458 // scenery center has been properly defined so any hit should
459 // be valid (and not just luck)
460 hit = fgCurrentElev(abs_pos_vector,
463 // uncomment next paramater to fly under
464 // bridges and a slightly faster algorithm
465 // but you won't be able to land on aircraft carriers
466 // current_tile->get_terra_transform(),
474 // cout << "elev = " << hit_elev << " " << hit_radius << endl;
475 globals->get_scenery()->set_cur_elev( hit_elev );
476 globals->get_scenery()->set_cur_radius( hit_radius );
477 globals->get_scenery()->set_cur_normal( hit_normal );
479 globals->get_scenery()->set_cur_elev( -9999.0 );
480 globals->get_scenery()->set_cur_radius( 0.0 );
481 globals->get_scenery()->set_cur_normal( hit_normal );
487 void FGTileMgr::prep_ssg_nodes( SGLocation *location, float vis ) {
489 // traverse the potentially viewable tile list and update range
490 // selector and transform
492 Point3D center = location->get_tile_center();
493 float *up = location->get_world_up();
496 tile_cache.reset_traversal();
498 while ( ! tile_cache.at_end() ) {
499 // cout << "processing a tile" << endl;
500 if ( (e = tile_cache.get_current()) ) {
501 e->prep_ssg_node( center, up, vis);
503 SG_LOG(SG_INPUT, SG_ALERT, "warning ... empty tile in cache");