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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
31 #include <osgViewer/Viewer>
32 #include <osgDB/Registry>
34 #include <simgear/constants.h>
35 #include <simgear/debug/logstream.hxx>
36 #include <simgear/structure/exception.hxx>
37 #include <simgear/scene/model/modellib.hxx>
38 #include <simgear/scene/util/SGReaderWriterOptions.hxx>
39 #include <simgear/scene/tsync/terrasync.hxx>
41 #include <Main/globals.hxx>
42 #include <Main/fg_props.hxx>
43 #include <Viewer/renderer.hxx>
44 #include <Viewer/splash.hxx>
45 #include <Scripting/NasalSys.hxx>
47 #include "scenery.hxx"
48 #include "SceneryPager.hxx"
49 #include "tilemgr.hxx"
51 using flightgear::SceneryPager;
54 FGTileMgr::FGTileMgr():
56 last_state( Running ),
59 scheduled_visibility(100.0),
61 _visibilityMeters(fgGetNode("/environment/visibility-m", true)),
62 _maxTileRangeM(fgGetNode("/sim/rendering/static-lod/bare", true)),
63 _disableNasalHooks(fgGetNode("/sim/temp/disable-scenery-nasal", true)),
64 _scenery_loaded(fgGetNode("/sim/sceneryloaded", true)),
65 _scenery_override(fgGetNode("/sim/sceneryloaded-override", true)),
66 _pager(FGScenery::getPagerSingleton())
71 FGTileMgr::~FGTileMgr()
73 // remove all nodes we might have left behind
74 osg::Group* group = globals->get_scenery()->get_terrain_branch();
75 group->removeChildren(0, group->getNumChildren());
77 osgDB::Registry::instance()->clearObjectCache();
81 // Initialize the Tile Manager subsystem
82 void FGTileMgr::init() {
83 SG_LOG( SG_TERRAIN, SG_INFO, "Initializing Tile Manager subsystem." );
85 _options = new simgear::SGReaderWriterOptions;
86 _options->setMaterialLib(globals->get_matlib());
87 _options->setPropertyNode(globals->get_props());
89 osgDB::FilePathList &fp = _options->getDatabasePathList();
90 const string_list &sc = globals->get_fg_scenery();
92 std::copy(sc.begin(), sc.end(), back_inserter(fp));
93 _options->setPluginStringData("SimGear::FG_ROOT", globals->get_fg_root());
94 if (!_disableNasalHooks->getBoolValue())
95 _options->setModelData(new FGNasalModelDataProxy);
100 void FGTileMgr::refresh_tile(void* tileMgr, long tileIndex)
102 ((FGTileMgr*) tileMgr)->tile_cache.refresh_tile(tileIndex);
105 void FGTileMgr::reinit()
107 // protect against multiple scenery reloads and properly reset flags,
108 // otherwise aircraft fall through the ground while reloading scenery
109 if (!fgGetBool("/sim/sceneryloaded",true))
111 fgSetBool("/sim/sceneryloaded",false);
112 fgSetDouble("/sim/startup/splash-alpha", 1.0);
114 // Reload the materials definitions
115 _options->setMaterialLib(globals->get_matlib());
117 // remove all old scenery nodes from scenegraph and clear cache
118 osg::Group* group = globals->get_scenery()->get_terrain_branch();
119 group->removeChildren(0, group->getNumChildren());
122 // clear OSG cache, except on initial start-up
125 osgDB::Registry::instance()->clearObjectCache();
130 previous_bucket.make_bad();
131 current_bucket.make_bad();
132 longitude = latitude = -1000.0;
133 scheduled_visibility = 100.0;
135 _terra_sync = (simgear::SGTerraSync*) globals->get_subsystem("terrasync");
137 _terra_sync->setTileRefreshCb(&refresh_tile, this);
139 // force an update now
143 /* schedule a tile for loading, keep request for given amount of time.
144 * Returns true if tile is already loaded. */
145 bool FGTileMgr::sched_tile( const SGBucket& b, double priority, bool current_view, double duration)
147 // see if tile already exists in the cache
148 TileEntry *t = tile_cache.get_tile( b );
151 // create a new entry
152 t = new TileEntry( b );
153 // insert the tile into the cache, update will generate load request
154 if ( tile_cache.insert_tile( t ) )
156 // Attach to scene graph
158 t->addToSceneGraph(globals->get_scenery()->get_terrain_branch());
161 // insert failed (cache full with no available entries to
162 // delete.) Try again later
167 SG_LOG( SG_TERRAIN, SG_DEBUG, " New tile cache size " << (int)tile_cache.get_size() );
170 // update tile's properties
171 tile_cache.request_tile(t,priority,current_view,duration);
173 return t->is_loaded();
176 /* schedule needed buckets for the current view position for loading,
177 * keep request for given amount of time */
178 void FGTileMgr::schedule_needed(const SGBucket& curr_bucket, double vis)
180 // sanity check (unfortunately needed!)
181 if ( longitude < -180.0 || longitude > 180.0
182 || latitude < -90.0 || latitude > 90.0 )
184 SG_LOG( SG_TERRAIN, SG_ALERT,
185 "Attempting to schedule tiles for bogus lon and lat = ("
186 << longitude << "," << latitude << ")" );
190 SG_LOG( SG_TERRAIN, SG_INFO,
191 "scheduling needed tiles for " << longitude << " " << latitude );
193 double tile_width = curr_bucket.get_width_m();
194 double tile_height = curr_bucket.get_height_m();
195 // cout << "tile width = " << tile_width << " tile_height = "
196 // << tile_height << endl;
198 double tileRangeM = std::min(vis,_maxTileRangeM->getDoubleValue());
199 int xrange = (int)(tileRangeM / tile_width) + 1;
200 int yrange = (int)(tileRangeM / tile_height) + 1;
201 if ( xrange < 1 ) { xrange = 1; }
202 if ( yrange < 1 ) { yrange = 1; }
204 // make the cache twice as large to avoid losing terrain when switching
205 // between aircraft and tower views
206 tile_cache.set_max_cache_size( (2*xrange + 2) * (2*yrange + 2) * 2 );
207 // cout << "xrange = " << xrange << " yrange = " << yrange << endl;
208 // cout << "max cache size = " << tile_cache.get_max_cache_size()
209 // << " current cache size = " << tile_cache.get_size() << endl;
211 // clear flags of all tiles belonging to the previous view set
212 tile_cache.clear_current_view();
214 // update timestamps, so all tiles scheduled now are *newer* than any tile previously loaded
215 osg::FrameStamp* framestamp
216 = globals->get_renderer()->getViewer()->getFrameStamp();
217 tile_cache.set_current_time(framestamp->getReferenceTime());
223 /* schedule all tiles, use distance-based loading priority,
224 * so tiles are loaded in innermost-to-outermost sequence. */
225 for ( x = -xrange; x <= xrange; ++x )
227 for ( y = -yrange; y <= yrange; ++y )
229 SGBucket b = sgBucketOffset( longitude, latitude, x, y );
230 float priority = (-1.0) * (x*x+y*y);
231 sched_tile( b, priority, true, 0.0 );
237 * Update the various queues maintained by the tilemagr (private
238 * internal function, do not call directly.)
240 void FGTileMgr::update_queues()
242 osg::FrameStamp* framestamp
243 = globals->get_renderer()->getViewer()->getFrameStamp();
244 double current_time = framestamp->getReferenceTime();
245 double vis = _visibilityMeters->getDoubleValue();
250 tile_cache.set_current_time( current_time );
251 tile_cache.reset_traversal();
253 while ( ! tile_cache.at_end() )
255 e = tile_cache.get_current();
256 // cout << "processing a tile" << endl;
259 // Prepare the ssg nodes corresponding to each tile.
260 // Set the ssg transform and update it's range selector
261 // based on current visibilty
262 e->prep_ssg_node(vis);
264 if (( !e->is_loaded() )&&
265 ((!e->is_expired(current_time))||
266 e->is_current_view() ))
268 // schedule tile for loading with osg pager
269 _pager->queueRequest(e->tileFileName,
273 e->getDatabaseRequest(),
279 SG_LOG(SG_TERRAIN, SG_ALERT, "Warning: empty tile in cache!");
285 int drop_count = sz - tile_cache.get_max_cache_size();
286 if (( drop_count > 0 )&&
287 ((loading==0)||(drop_count > 10)))
289 long drop_index = tile_cache.get_drop_tile();
290 while ( drop_index > -1 )
292 // schedule tile for deletion with osg pager
293 TileEntry* old = tile_cache.get_tile(drop_index);
294 tile_cache.clear_entry(drop_index);
296 osg::ref_ptr<osg::Object> subgraph = old->getNode();
297 old->removeFromSceneGraph();
299 // zeros out subgraph ref_ptr, so subgraph is owned by
300 // the pager and will be deleted in the pager thread.
301 _pager->queueDeleteRequest(subgraph);
303 if (--drop_count > 0)
304 drop_index = tile_cache.get_drop_tile();
311 // given the current lon/lat (in degrees), fill in the array of local
312 // chunks. If the chunk isn't already in the cache, then read it from
314 void FGTileMgr::update(double)
316 double vis = _visibilityMeters->getDoubleValue();
317 schedule_tiles_at(globals->get_view_position(), vis);
321 // scenery loading check, triggers after each sim (tile manager) reinit
322 if (!_scenery_loaded->getBoolValue())
324 bool fdmInited = fgGetBool("sim/fdm-initialized");
325 if (_scenery_override->getBoolValue() || (isSceneryLoaded() && fdmInited))
327 _scenery_loaded->setBoolValue(true);
328 fgSplashProgress("");
332 fgSplashProgress("loading-scenery");
333 // be nice to loader threads while waiting for initial scenery, reduce to 20fps
334 SGTimeStamp::sleepForMSec(50);
339 // schedule tiles for the viewer bucket
340 // (FDM/AI/groundcache/... should use "schedule_scenery" instead)
341 void FGTileMgr::schedule_tiles_at(const SGGeod& location, double range_m)
343 longitude = location.getLongitudeDeg();
344 latitude = location.getLatitudeDeg();
346 // SG_LOG( SG_TERRAIN, SG_DEBUG, "FGTileMgr::update() for "
347 // << longitude << " " << latitude );
349 current_bucket.set_bucket( location );
351 // schedule more tiles when visibility increased considerably
352 // TODO Calculate tile size - instead of using fixed value (5000m)
353 if (range_m - scheduled_visibility > 5000.0)
354 previous_bucket.make_bad();
356 // SG_LOG( SG_TERRAIN, SG_DEBUG, "Updating tile list for "
357 // << current_bucket );
358 fgSetInt( "/environment/current-tile-id", current_bucket.gen_index() );
360 // do tile load scheduling.
361 // Note that we need keep track of both viewer buckets and fdm buckets.
362 if ( state == Running ) {
363 if (last_state != state)
365 SG_LOG( SG_TERRAIN, SG_DEBUG, "State == Running" );
367 if (current_bucket != previous_bucket) {
368 // We've moved to a new bucket, we need to schedule any
369 // needed tiles for loading.
370 SG_LOG( SG_TERRAIN, SG_INFO, "FGTileMgr::update()" );
371 scheduled_visibility = range_m;
372 schedule_needed(current_bucket, range_m);
374 _terra_sync->schedulePosition(latitude,longitude);
377 previous_bucket = current_bucket;
378 } else if ( state == Start || state == Inited ) {
379 SG_LOG( SG_TERRAIN, SG_DEBUG, "State == Start || Inited" );
380 // do not update bucket yet (position not valid in initial loop)
382 previous_bucket.make_bad();
387 /** Schedules scenery for given position. Load request remains valid for given duration
388 * (duration=0.0 => nothing is loaded).
389 * Used for FDM/AI/groundcache/... requests. Viewer uses "schedule_tiles_at" instead.
390 * Returns true when all tiles for the given position are already loaded, false otherwise.
392 bool FGTileMgr::schedule_scenery(const SGGeod& position, double range_m, double duration)
394 const float priority = 0.0;
395 double current_longitude = position.getLongitudeDeg();
396 double current_latitude = position.getLatitudeDeg();
397 bool available = true;
399 // sanity check (unfortunately needed!)
400 if (current_longitude < -180 || current_longitude > 180 ||
401 current_latitude < -90 || current_latitude > 90)
404 SGBucket bucket(position);
405 available = sched_tile( bucket, priority, false, duration );
407 if ((!available)&&(duration==0.0))
410 SGVec3d cartPos = SGVec3d::fromGeod(position);
412 // Traverse all tiles required to be there for the given visibility.
413 double tile_width = bucket.get_width_m();
414 double tile_height = bucket.get_height_m();
415 double tile_r = 0.5*sqrt(tile_width*tile_width + tile_height*tile_height);
416 double max_dist = tile_r + range_m;
417 double max_dist2 = max_dist*max_dist;
419 int xrange = (int)fabs(range_m / tile_width) + 1;
420 int yrange = (int)fabs(range_m / tile_height) + 1;
422 for ( int x = -xrange; x <= xrange; ++x )
424 for ( int y = -yrange; y <= yrange; ++y )
426 // We have already checked for the center tile.
427 if ( x != 0 || y != 0 )
429 SGBucket b = sgBucketOffset( current_longitude,
430 current_latitude, x, y );
431 double distance2 = distSqr(cartPos, SGVec3d::fromGeod(b.get_center()));
432 // Do not ask if it is just the next tile but way out of range.
433 if (distance2 <= max_dist2)
435 available &= sched_tile( b, priority, false, duration );
436 if ((!available)&&(duration==0.0))
446 // Returns true if tiles around current view position have been loaded
447 bool FGTileMgr::isSceneryLoaded()
449 double range_m = 100.0;
450 if (scheduled_visibility < range_m)
451 range_m = scheduled_visibility;
453 return schedule_scenery(SGGeod::fromDeg(longitude, latitude), range_m, 0.0);