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>
40 #include <simgear/misc/strutils.hxx>
41 #include <simgear/scene/material/matlib.hxx>
43 #include <Main/globals.hxx>
44 #include <Main/fg_props.hxx>
45 #include <Viewer/renderer.hxx>
46 #include <Viewer/splash.hxx>
47 #include <Scripting/NasalSys.hxx>
48 #include <Scripting/NasalModelData.hxx>
50 #include "scenery.hxx"
51 #include "SceneryPager.hxx"
52 #include "tilemgr.hxx"
54 using flightgear::SceneryPager;
56 class FGTileMgr::TileManagerListener : public SGPropertyChangeListener
59 TileManagerListener(FGTileMgr* manager) :
61 _useVBOsProp(fgGetNode("/sim/rendering/use-vbos", true)),
62 _enableCacheProp(fgGetNode("/sim/tile-cache/enable", true)),
63 _pagedLODMaximumProp(fgGetNode("/sim/rendering/max-paged-lod", true))
65 _useVBOsProp->addChangeListener(this, true);
67 _enableCacheProp->addChangeListener(this, true);
68 if (_enableCacheProp->getType() == simgear::props::NONE) {
69 _enableCacheProp->setBoolValue(true);
72 if (_pagedLODMaximumProp->getType() == simgear::props::NONE) {
73 // not set, use OSG default / environment value variable
74 osg::ref_ptr<osgViewer::Viewer> viewer(globals->get_renderer()->getViewer());
75 int current = viewer->getDatabasePager()->getTargetMaximumNumberOfPageLOD();
76 _pagedLODMaximumProp->setIntValue(current);
78 _pagedLODMaximumProp->addChangeListener(this, true);
81 ~TileManagerListener()
83 _useVBOsProp->removeChangeListener(this);
84 _enableCacheProp->removeChangeListener(this);
85 _pagedLODMaximumProp->removeChangeListener(this);
88 virtual void valueChanged(SGPropertyNode* prop)
90 if (prop == _useVBOsProp) {
91 bool useVBOs = prop->getBoolValue();
92 _manager->_options->setPluginStringData("SimGear::USE_VBOS",
93 useVBOs ? "ON" : "OFF");
94 } else if (prop == _enableCacheProp) {
95 _manager->_enableCache = prop->getBoolValue();
96 } else if (prop == _pagedLODMaximumProp) {
97 int v = prop->getIntValue();
98 osg::ref_ptr<osgViewer::Viewer> viewer(globals->get_renderer()->getViewer());
99 viewer->getDatabasePager()->setTargetMaximumNumberOfPageLOD(v);
105 SGPropertyNode_ptr _useVBOsProp,
107 _pagedLODMaximumProp;
110 FGTileMgr::FGTileMgr():
112 last_state( Running ),
113 scheduled_visibility(100.0),
116 _visibilityMeters(fgGetNode("/environment/visibility-m", true)),
117 _maxTileRangeM(fgGetNode("/sim/rendering/static-lod/bare", true)),
118 _disableNasalHooks(fgGetNode("/sim/temp/disable-scenery-nasal", true)),
119 _scenery_loaded(fgGetNode("/sim/sceneryloaded", true)),
120 _scenery_override(fgGetNode("/sim/sceneryloaded-override", true)),
121 _pager(FGScenery::getPagerSingleton()),
127 FGTileMgr::~FGTileMgr()
131 // remove all nodes we might have left behind
132 osg::Group* group = globals->get_scenery()->get_terrain_branch();
133 group->removeChildren(0, group->getNumChildren());
135 osgDB::Registry::instance()->clearObjectCache();
139 // Initialize the Tile Manager subsystem
140 void FGTileMgr::init()
145 void FGTileMgr::reinit()
147 SG_LOG( SG_TERRAIN, SG_INFO, "Initializing Tile Manager subsystem." );
148 _terra_sync = static_cast<simgear::SGTerraSync*> (globals->get_subsystem("terrasync"));
150 // drops the previous options reference
151 _options = new simgear::SGReaderWriterOptions;
152 _listener = new TileManagerListener(this);
154 materialLibChanged();
155 _options->setPropertyNode(globals->get_props());
157 osgDB::FilePathList &fp = _options->getDatabasePathList();
158 const string_list &sc = globals->get_fg_scenery();
160 std::copy(sc.begin(), sc.end(), back_inserter(fp));
161 _options->setPluginStringData("SimGear::FG_ROOT", globals->get_fg_root());
164 _options->setPluginStringData("SimGear::TERRASYNC_ROOT", fgGetString("/sim/terrasync/scenery-dir"));
167 if (!_disableNasalHooks->getBoolValue())
168 _options->setModelData(new FGNasalModelDataProxy);
173 // protect against multiple scenery reloads and properly reset flags,
174 // otherwise aircraft fall through the ground while reloading scenery
175 if (_scenery_loaded->getBoolValue() == false)
179 _scenery_loaded->setBoolValue(false);
180 fgSetDouble("/sim/startup/splash-alpha", 1.0);
182 materialLibChanged();
184 // remove all old scenery nodes from scenegraph and clear cache
185 osg::Group* group = globals->get_scenery()->get_terrain_branch();
186 group->removeChildren(0, group->getNumChildren());
189 // clear OSG cache, except on initial start-up
192 osgDB::Registry::instance()->clearObjectCache();
197 previous_bucket.make_bad();
198 current_bucket.make_bad();
199 scheduled_visibility = 100.0;
201 // force an update now
205 void FGTileMgr::materialLibChanged()
207 _options->setMaterialLib(globals->get_matlib());
210 /* schedule a tile for loading, keep request for given amount of time.
211 * Returns true if tile is already loaded. */
212 bool FGTileMgr::sched_tile( const SGBucket& b, double priority, bool current_view, double duration)
214 // see if tile already exists in the cache
215 TileEntry *t = tile_cache.get_tile( b );
218 // create a new entry
219 t = new TileEntry( b );
220 // insert the tile into the cache, update will generate load request
221 if ( tile_cache.insert_tile( t ) )
223 // Attach to scene graph
225 t->addToSceneGraph(globals->get_scenery()->get_terrain_branch());
228 // insert failed (cache full with no available entries to
229 // delete.) Try again later
234 SG_LOG( SG_TERRAIN, SG_DEBUG, " New tile cache size " << (int)tile_cache.get_size() );
237 // update tile's properties
238 tile_cache.request_tile(t,priority,current_view,duration);
240 return t->is_loaded();
243 /* schedule needed buckets for the current view position for loading,
244 * keep request for given amount of time */
245 void FGTileMgr::schedule_needed(const SGBucket& curr_bucket, double vis)
247 // sanity check (unfortunately needed!)
248 if (!curr_bucket.isValid() )
250 SG_LOG( SG_TERRAIN, SG_ALERT,
251 "Attempting to schedule tiles for invalid bucket" );
255 double tile_width = curr_bucket.get_width_m();
256 double tile_height = curr_bucket.get_height_m();
257 SG_LOG( SG_TERRAIN, SG_INFO,
258 "scheduling needed tiles for " << curr_bucket
259 << ", tile-width-m:" << tile_width << ", tile-height-m:" << tile_height);
262 // cout << "tile width = " << tile_width << " tile_height = "
263 // << tile_height << endl;
265 double tileRangeM = std::min(vis,_maxTileRangeM->getDoubleValue());
266 int xrange = (int)(tileRangeM / tile_width) + 1;
267 int yrange = (int)(tileRangeM / tile_height) + 1;
268 if ( xrange < 1 ) { xrange = 1; }
269 if ( yrange < 1 ) { yrange = 1; }
271 // make the cache twice as large to avoid losing terrain when switching
272 // between aircraft and tower views
273 tile_cache.set_max_cache_size( (2*xrange + 2) * (2*yrange + 2) * 2 );
274 // cout << "xrange = " << xrange << " yrange = " << yrange << endl;
275 // cout << "max cache size = " << tile_cache.get_max_cache_size()
276 // << " current cache size = " << tile_cache.get_size() << endl;
278 // clear flags of all tiles belonging to the previous view set
279 tile_cache.clear_current_view();
281 // update timestamps, so all tiles scheduled now are *newer* than any tile previously loaded
282 osg::FrameStamp* framestamp
283 = globals->get_renderer()->getViewer()->getFrameStamp();
284 tile_cache.set_current_time(framestamp->getReferenceTime());
290 /* schedule all tiles, use distance-based loading priority,
291 * so tiles are loaded in innermost-to-outermost sequence. */
292 for ( x = -xrange; x <= xrange; ++x )
294 for ( y = -yrange; y <= yrange; ++y )
296 SGBucket b = curr_bucket.sibling(x, y);
301 float priority = (-1.0) * (x*x+y*y);
302 sched_tile( b, priority, true, 0.0 );
305 _terra_sync->scheduleTile(b);
312 * Update the various queues maintained by the tilemgr (private
313 * internal function, do not call directly.)
315 void FGTileMgr::update_queues(bool& isDownloadingScenery)
317 osg::FrameStamp* framestamp
318 = globals->get_renderer()->getViewer()->getFrameStamp();
319 double current_time = framestamp->getReferenceTime();
320 double vis = _visibilityMeters->getDoubleValue();
325 tile_cache.set_current_time( current_time );
326 tile_cache.reset_traversal();
328 while ( ! tile_cache.at_end() )
330 e = tile_cache.get_current();
333 // Prepare the ssg nodes corresponding to each tile.
334 // Set the ssg transform and update it's range selector
335 // based on current visibilty
336 e->prep_ssg_node(vis);
338 if (!e->is_loaded()) {
339 bool nonExpiredOrCurrent = !e->is_expired(current_time) || e->is_current_view();
340 bool downloading = isTileDirSyncing(e->tileFileName);
341 isDownloadingScenery |= downloading;
342 if ( !downloading && nonExpiredOrCurrent) {
343 // schedule tile for loading with osg pager
344 _pager->queueRequest(e->tileFileName,
348 e->getDatabaseRequest(),
352 } // of tile not loaded case
354 SG_LOG(SG_TERRAIN, SG_ALERT, "Warning: empty tile in cache!");
360 int drop_count = sz - tile_cache.get_max_cache_size();
361 bool dropTiles = false;
363 dropTiles = ( drop_count > 0 ) && ((loading==0)||(drop_count > 10));
366 drop_count = sz; // no limit on tiles to drop
371 long drop_index = _enableCache ? tile_cache.get_drop_tile() :
372 tile_cache.get_first_expired_tile();
373 while ( drop_index > -1 )
375 // schedule tile for deletion with osg pager
376 TileEntry* old = tile_cache.get_tile(drop_index);
377 SG_LOG(SG_TERRAIN, SG_DEBUG, "Dropping:" << old->get_tile_bucket());
379 tile_cache.clear_entry(drop_index);
381 osg::ref_ptr<osg::Object> subgraph = old->getNode();
382 old->removeFromSceneGraph();
384 // zeros out subgraph ref_ptr, so subgraph is owned by
385 // the pager and will be deleted in the pager thread.
386 _pager->queueDeleteRequest(subgraph);
389 drop_index = tile_cache.get_first_expired_tile();
390 // limit tiles dropped to drop_count
391 else if (--drop_count > 0)
392 drop_index = tile_cache.get_drop_tile();
396 } // of dropping tiles loop
399 // given the current lon/lat (in degrees), fill in the array of local
400 // chunks. If the chunk isn't already in the cache, then read it from
402 void FGTileMgr::update(double)
404 double vis = _visibilityMeters->getDoubleValue();
405 schedule_tiles_at(globals->get_view_position(), vis);
407 bool waitingOnTerrasync = false;
408 update_queues(waitingOnTerrasync);
410 // scenery loading check, triggers after each sim (tile manager) reinit
411 if (!_scenery_loaded->getBoolValue())
413 bool fdmInited = fgGetBool("sim/fdm-initialized");
414 bool positionFinalized = fgGetBool("sim/position-finalized");
415 bool sceneryOverride = _scenery_override->getBoolValue();
418 // we are done if final position is set and the scenery & FDM are done.
419 // scenery-override can ignore the last two, but not position finalization.
420 if (positionFinalized && (sceneryOverride || (isSceneryLoaded() && fdmInited)))
422 _scenery_loaded->setBoolValue(true);
423 fgSplashProgress("");
427 if (!positionFinalized) {
428 fgSplashProgress("finalize-position");
429 } else if (waitingOnTerrasync) {
430 fgSplashProgress("downloading-scenery");
432 fgSplashProgress("loading-scenery");
435 // be nice to loader threads while waiting for initial scenery, reduce to 20fps
436 SGTimeStamp::sleepForMSec(50);
441 // schedule tiles for the viewer bucket
442 // (FDM/AI/groundcache/... should use "schedule_scenery" instead)
443 void FGTileMgr::schedule_tiles_at(const SGGeod& location, double range_m)
445 // SG_LOG( SG_TERRAIN, SG_DEBUG, "FGTileMgr::update() for "
446 // << longitude << " " << latitude );
448 current_bucket = SGBucket( location );
450 // schedule more tiles when visibility increased considerably
451 // TODO Calculate tile size - instead of using fixed value (5000m)
452 if (range_m - scheduled_visibility > 5000.0)
453 previous_bucket.make_bad();
455 // SG_LOG( SG_TERRAIN, SG_DEBUG, "Updating tile list for "
456 // << current_bucket );
457 fgSetInt( "/environment/current-tile-id", current_bucket.gen_index() );
459 // do tile load scheduling.
460 // Note that we need keep track of both viewer buckets and fdm buckets.
461 if ( state == Running ) {
462 if (last_state != state)
464 SG_LOG( SG_TERRAIN, SG_DEBUG, "State == Running" );
466 if (current_bucket != previous_bucket) {
467 // We've moved to a new bucket, we need to schedule any
468 // needed tiles for loading.
469 SG_LOG( SG_TERRAIN, SG_INFO, "FGTileMgr: at " << location << ", scheduling needed for:" << current_bucket
470 << ", visbility=" << range_m);
471 scheduled_visibility = range_m;
472 schedule_needed(current_bucket, range_m);
476 previous_bucket = current_bucket;
477 } else if ( state == Start || state == Inited ) {
478 SG_LOG( SG_TERRAIN, SG_DEBUG, "State == Start || Inited" );
479 // do not update bucket yet (position not valid in initial loop)
481 previous_bucket.make_bad();
486 /** Schedules scenery for given position. Load request remains valid for given duration
487 * (duration=0.0 => nothing is loaded).
488 * Used for FDM/AI/groundcache/... requests. Viewer uses "schedule_tiles_at" instead.
489 * Returns true when all tiles for the given position are already loaded, false otherwise.
491 bool FGTileMgr::schedule_scenery(const SGGeod& position, double range_m, double duration)
493 // sanity check (unfortunately needed!)
494 if (!position.isValid())
496 const float priority = 0.0;
497 bool available = true;
499 SGBucket bucket(position);
500 available = sched_tile( bucket, priority, false, duration );
502 if ((!available)&&(duration==0.0))
505 SGVec3d cartPos = SGVec3d::fromGeod(position);
507 // Traverse all tiles required to be there for the given visibility.
508 double tile_width = bucket.get_width_m();
509 double tile_height = bucket.get_height_m();
510 double tile_r = 0.5*sqrt(tile_width*tile_width + tile_height*tile_height);
511 double max_dist = tile_r + range_m;
512 double max_dist2 = max_dist*max_dist;
514 int xrange = (int)fabs(range_m / tile_width) + 1;
515 int yrange = (int)fabs(range_m / tile_height) + 1;
517 for ( int x = -xrange; x <= xrange; ++x )
519 for ( int y = -yrange; y <= yrange; ++y )
521 // We have already checked for the center tile.
522 if ( x != 0 || y != 0 )
524 SGBucket b = bucket.sibling(x, y );
529 double distance2 = distSqr(cartPos, SGVec3d::fromGeod(b.get_center()));
530 // Do not ask if it is just the next tile but way out of range.
531 if (distance2 <= max_dist2)
533 available &= sched_tile( b, priority, false, duration );
534 if ((!available)&&(duration==0.0))
544 // Returns true if tiles around current view position have been loaded
545 bool FGTileMgr::isSceneryLoaded()
547 double range_m = 100.0;
548 if (scheduled_visibility < range_m)
549 range_m = scheduled_visibility;
551 return schedule_scenery(globals->get_view_position(), range_m, 0.0);
554 bool FGTileMgr::isTileDirSyncing(const std::string& tileFileName) const
560 std::string nameWithoutExtension = tileFileName.substr(0, tileFileName.size() - 4);
561 long int bucketIndex = simgear::strutils::to_int(nameWithoutExtension);
562 SGBucket bucket(bucketIndex);
564 return _terra_sync->isTileDirPending(bucket.gen_base_path());