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>
46 #include <Scripting/NasalModelData.hxx>
48 #include "scenery.hxx"
49 #include "SceneryPager.hxx"
50 #include "tilemgr.hxx"
52 using flightgear::SceneryPager;
55 FGTileMgr::FGTileMgr():
57 last_state( Running ),
60 scheduled_visibility(100.0),
62 _visibilityMeters(fgGetNode("/environment/visibility-m", true)),
63 _maxTileRangeM(fgGetNode("/sim/rendering/static-lod/bare", true)),
64 _disableNasalHooks(fgGetNode("/sim/temp/disable-scenery-nasal", true)),
65 _scenery_loaded(fgGetNode("/sim/sceneryloaded", true)),
66 _scenery_override(fgGetNode("/sim/sceneryloaded-override", true)),
67 _pager(FGScenery::getPagerSingleton())
72 FGTileMgr::~FGTileMgr()
74 // remove all nodes we might have left behind
75 osg::Group* group = globals->get_scenery()->get_terrain_branch();
76 group->removeChildren(0, group->getNumChildren());
78 osgDB::Registry::instance()->clearObjectCache();
82 // Initialize the Tile Manager subsystem
83 void FGTileMgr::init() {
84 SG_LOG( SG_TERRAIN, SG_INFO, "Initializing Tile Manager subsystem." );
86 _options = new simgear::SGReaderWriterOptions;
87 _options->setMaterialLib(globals->get_matlib());
88 _options->setPropertyNode(globals->get_props());
90 osgDB::FilePathList &fp = _options->getDatabasePathList();
91 const string_list &sc = globals->get_fg_scenery();
93 std::copy(sc.begin(), sc.end(), back_inserter(fp));
94 _options->setPluginStringData("SimGear::FG_ROOT", globals->get_fg_root());
96 if (globals->get_subsystem("terrasync")) {
97 _options->setPluginStringData("SimGear::TERRASYNC_ROOT", fgGetString("/sim/terrasync/scenery-dir"));
100 if (!_disableNasalHooks->getBoolValue())
101 _options->setModelData(new FGNasalModelDataProxy);
106 void FGTileMgr::refresh_tile(void* tileMgr, long tileIndex)
108 ((FGTileMgr*) tileMgr)->tile_cache.refresh_tile(tileIndex);
111 void FGTileMgr::reinit()
113 _terra_sync = static_cast<simgear::SGTerraSync*> (globals->get_subsystem("terrasync"));
115 _terra_sync->setTileRefreshCb(&refresh_tile, this);
117 // protect against multiple scenery reloads and properly reset flags,
118 // otherwise aircraft fall through the ground while reloading scenery
119 if (!fgGetBool("/sim/sceneryloaded",true))
121 fgSetBool("/sim/sceneryloaded",false);
122 fgSetDouble("/sim/startup/splash-alpha", 1.0);
124 // Reload the materials definitions
125 _options->setMaterialLib(globals->get_matlib());
127 // remove all old scenery nodes from scenegraph and clear cache
128 osg::Group* group = globals->get_scenery()->get_terrain_branch();
129 group->removeChildren(0, group->getNumChildren());
132 // clear OSG cache, except on initial start-up
135 osgDB::Registry::instance()->clearObjectCache();
140 previous_bucket.make_bad();
141 current_bucket.make_bad();
142 longitude = latitude = -1000.0;
143 scheduled_visibility = 100.0;
145 // force an update now
149 /* schedule a tile for loading, keep request for given amount of time.
150 * Returns true if tile is already loaded. */
151 bool FGTileMgr::sched_tile( const SGBucket& b, double priority, bool current_view, double duration)
153 // see if tile already exists in the cache
154 TileEntry *t = tile_cache.get_tile( b );
157 // create a new entry
158 t = new TileEntry( b );
159 // insert the tile into the cache, update will generate load request
160 if ( tile_cache.insert_tile( t ) )
162 // Attach to scene graph
164 t->addToSceneGraph(globals->get_scenery()->get_terrain_branch());
167 // insert failed (cache full with no available entries to
168 // delete.) Try again later
173 SG_LOG( SG_TERRAIN, SG_DEBUG, " New tile cache size " << (int)tile_cache.get_size() );
176 // update tile's properties
177 tile_cache.request_tile(t,priority,current_view,duration);
179 return t->is_loaded();
182 /* schedule needed buckets for the current view position for loading,
183 * keep request for given amount of time */
184 void FGTileMgr::schedule_needed(const SGBucket& curr_bucket, double vis)
186 // sanity check (unfortunately needed!)
187 if ( longitude < -180.0 || longitude > 180.0
188 || latitude < -90.0 || latitude > 90.0 )
190 SG_LOG( SG_TERRAIN, SG_ALERT,
191 "Attempting to schedule tiles for bogus lon and lat = ("
192 << longitude << "," << latitude << ")" );
196 SG_LOG( SG_TERRAIN, SG_INFO,
197 "scheduling needed tiles for " << longitude << " " << latitude );
199 double tile_width = curr_bucket.get_width_m();
200 double tile_height = curr_bucket.get_height_m();
201 // cout << "tile width = " << tile_width << " tile_height = "
202 // << tile_height << endl;
204 double tileRangeM = std::min(vis,_maxTileRangeM->getDoubleValue());
205 int xrange = (int)(tileRangeM / tile_width) + 1;
206 int yrange = (int)(tileRangeM / tile_height) + 1;
207 if ( xrange < 1 ) { xrange = 1; }
208 if ( yrange < 1 ) { yrange = 1; }
210 // make the cache twice as large to avoid losing terrain when switching
211 // between aircraft and tower views
212 tile_cache.set_max_cache_size( (2*xrange + 2) * (2*yrange + 2) * 2 );
213 // cout << "xrange = " << xrange << " yrange = " << yrange << endl;
214 // cout << "max cache size = " << tile_cache.get_max_cache_size()
215 // << " current cache size = " << tile_cache.get_size() << endl;
217 // clear flags of all tiles belonging to the previous view set
218 tile_cache.clear_current_view();
220 // update timestamps, so all tiles scheduled now are *newer* than any tile previously loaded
221 osg::FrameStamp* framestamp
222 = globals->get_renderer()->getViewer()->getFrameStamp();
223 tile_cache.set_current_time(framestamp->getReferenceTime());
229 /* schedule all tiles, use distance-based loading priority,
230 * so tiles are loaded in innermost-to-outermost sequence. */
231 for ( x = -xrange; x <= xrange; ++x )
233 for ( y = -yrange; y <= yrange; ++y )
235 SGBucket b = sgBucketOffset( longitude, latitude, x, y );
236 float priority = (-1.0) * (x*x+y*y);
237 sched_tile( b, priority, true, 0.0 );
243 * Update the various queues maintained by the tilemagr (private
244 * internal function, do not call directly.)
246 void FGTileMgr::update_queues()
248 osg::FrameStamp* framestamp
249 = globals->get_renderer()->getViewer()->getFrameStamp();
250 double current_time = framestamp->getReferenceTime();
251 double vis = _visibilityMeters->getDoubleValue();
256 tile_cache.set_current_time( current_time );
257 tile_cache.reset_traversal();
259 while ( ! tile_cache.at_end() )
261 e = tile_cache.get_current();
262 // cout << "processing a tile" << endl;
265 // Prepare the ssg nodes corresponding to each tile.
266 // Set the ssg transform and update it's range selector
267 // based on current visibilty
268 e->prep_ssg_node(vis);
270 if (( !e->is_loaded() )&&
271 ((!e->is_expired(current_time))||
272 e->is_current_view() ))
274 // schedule tile for loading with osg pager
275 _pager->queueRequest(e->tileFileName,
279 e->getDatabaseRequest(),
285 SG_LOG(SG_TERRAIN, SG_ALERT, "Warning: empty tile in cache!");
291 int drop_count = sz - tile_cache.get_max_cache_size();
292 if (( drop_count > 0 )&&
293 ((loading==0)||(drop_count > 10)))
295 long drop_index = tile_cache.get_drop_tile();
296 while ( drop_index > -1 )
298 // schedule tile for deletion with osg pager
299 TileEntry* old = tile_cache.get_tile(drop_index);
300 tile_cache.clear_entry(drop_index);
302 osg::ref_ptr<osg::Object> subgraph = old->getNode();
303 old->removeFromSceneGraph();
305 // zeros out subgraph ref_ptr, so subgraph is owned by
306 // the pager and will be deleted in the pager thread.
307 _pager->queueDeleteRequest(subgraph);
309 if (--drop_count > 0)
310 drop_index = tile_cache.get_drop_tile();
317 // given the current lon/lat (in degrees), fill in the array of local
318 // chunks. If the chunk isn't already in the cache, then read it from
320 void FGTileMgr::update(double)
322 double vis = _visibilityMeters->getDoubleValue();
323 schedule_tiles_at(globals->get_view_position(), vis);
327 // scenery loading check, triggers after each sim (tile manager) reinit
328 if (!_scenery_loaded->getBoolValue())
330 bool fdmInited = fgGetBool("sim/fdm-initialized");
331 bool positionFinalized = fgGetBool("sim/position-finalized");
332 bool sceneryOverride = _scenery_override->getBoolValue();
334 // we are done if final position is set and the scenery & FDM are done.
335 // scenery-override can ignore the last two, but not position finalization.
336 if (positionFinalized && (sceneryOverride || (isSceneryLoaded() && fdmInited)))
338 _scenery_loaded->setBoolValue(true);
339 fgSplashProgress("");
343 fgSplashProgress(positionFinalized ? "loading-scenery" : "finalize-position");
344 // be nice to loader threads while waiting for initial scenery, reduce to 20fps
345 SGTimeStamp::sleepForMSec(50);
350 // schedule tiles for the viewer bucket
351 // (FDM/AI/groundcache/... should use "schedule_scenery" instead)
352 void FGTileMgr::schedule_tiles_at(const SGGeod& location, double range_m)
354 longitude = location.getLongitudeDeg();
355 latitude = location.getLatitudeDeg();
357 // SG_LOG( SG_TERRAIN, SG_DEBUG, "FGTileMgr::update() for "
358 // << longitude << " " << latitude );
360 current_bucket.set_bucket( location );
362 // schedule more tiles when visibility increased considerably
363 // TODO Calculate tile size - instead of using fixed value (5000m)
364 if (range_m - scheduled_visibility > 5000.0)
365 previous_bucket.make_bad();
367 // SG_LOG( SG_TERRAIN, SG_DEBUG, "Updating tile list for "
368 // << current_bucket );
369 fgSetInt( "/environment/current-tile-id", current_bucket.gen_index() );
371 // do tile load scheduling.
372 // Note that we need keep track of both viewer buckets and fdm buckets.
373 if ( state == Running ) {
374 if (last_state != state)
376 SG_LOG( SG_TERRAIN, SG_DEBUG, "State == Running" );
378 if (current_bucket != previous_bucket) {
379 // We've moved to a new bucket, we need to schedule any
380 // needed tiles for loading.
381 SG_LOG( SG_TERRAIN, SG_INFO, "FGTileMgr::update()" );
382 scheduled_visibility = range_m;
383 schedule_needed(current_bucket, range_m);
385 _terra_sync->schedulePosition(latitude,longitude);
388 previous_bucket = current_bucket;
389 } else if ( state == Start || state == Inited ) {
390 SG_LOG( SG_TERRAIN, SG_DEBUG, "State == Start || Inited" );
391 // do not update bucket yet (position not valid in initial loop)
393 previous_bucket.make_bad();
398 /** Schedules scenery for given position. Load request remains valid for given duration
399 * (duration=0.0 => nothing is loaded).
400 * Used for FDM/AI/groundcache/... requests. Viewer uses "schedule_tiles_at" instead.
401 * Returns true when all tiles for the given position are already loaded, false otherwise.
403 bool FGTileMgr::schedule_scenery(const SGGeod& position, double range_m, double duration)
405 const float priority = 0.0;
406 double current_longitude = position.getLongitudeDeg();
407 double current_latitude = position.getLatitudeDeg();
408 bool available = true;
410 // sanity check (unfortunately needed!)
411 if (current_longitude < -180 || current_longitude > 180 ||
412 current_latitude < -90 || current_latitude > 90)
415 SGBucket bucket(position);
416 available = sched_tile( bucket, priority, false, duration );
418 if ((!available)&&(duration==0.0))
421 SGVec3d cartPos = SGVec3d::fromGeod(position);
423 // Traverse all tiles required to be there for the given visibility.
424 double tile_width = bucket.get_width_m();
425 double tile_height = bucket.get_height_m();
426 double tile_r = 0.5*sqrt(tile_width*tile_width + tile_height*tile_height);
427 double max_dist = tile_r + range_m;
428 double max_dist2 = max_dist*max_dist;
430 int xrange = (int)fabs(range_m / tile_width) + 1;
431 int yrange = (int)fabs(range_m / tile_height) + 1;
433 for ( int x = -xrange; x <= xrange; ++x )
435 for ( int y = -yrange; y <= yrange; ++y )
437 // We have already checked for the center tile.
438 if ( x != 0 || y != 0 )
440 SGBucket b = sgBucketOffset( current_longitude,
441 current_latitude, x, y );
442 double distance2 = distSqr(cartPos, SGVec3d::fromGeod(b.get_center()));
443 // Do not ask if it is just the next tile but way out of range.
444 if (distance2 <= max_dist2)
446 available &= sched_tile( b, priority, false, duration );
447 if ((!available)&&(duration==0.0))
457 // Returns true if tiles around current view position have been loaded
458 bool FGTileMgr::isSceneryLoaded()
460 double range_m = 100.0;
461 if (scheduled_visibility < range_m)
462 range_m = scheduled_visibility;
464 return schedule_scenery(SGGeod::fromDeg(longitude, latitude), range_m, 0.0);