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))
64 _useVBOsProp->addChangeListener(this, true);
65 _enableCacheProp->addChangeListener(this, true);
68 ~TileManagerListener()
70 _useVBOsProp->removeChangeListener(this);
71 _enableCacheProp->removeChangeListener(this);
74 virtual void valueChanged(SGPropertyNode* prop)
76 if (prop == _useVBOsProp) {
77 bool useVBOs = prop->getBoolValue();
78 _manager->_options->setPluginStringData("SimGear::USE_VBOS",
79 useVBOs ? "ON" : "OFF");
80 } else if (prop == _enableCacheProp) {
81 _manager->_enableCache = prop->getBoolValue();
87 SGPropertyNode_ptr _useVBOsProp,
91 FGTileMgr::FGTileMgr():
93 last_state( Running ),
94 scheduled_visibility(100.0),
97 _visibilityMeters(fgGetNode("/environment/visibility-m", true)),
98 _maxTileRangeM(fgGetNode("/sim/rendering/static-lod/bare", true)),
99 _disableNasalHooks(fgGetNode("/sim/temp/disable-scenery-nasal", true)),
100 _scenery_loaded(fgGetNode("/sim/sceneryloaded", true)),
101 _scenery_override(fgGetNode("/sim/sceneryloaded-override", true)),
102 _pager(FGScenery::getPagerSingleton()),
108 FGTileMgr::~FGTileMgr()
112 // remove all nodes we might have left behind
113 osg::Group* group = globals->get_scenery()->get_terrain_branch();
114 group->removeChildren(0, group->getNumChildren());
116 osgDB::Registry::instance()->clearObjectCache();
120 // Initialize the Tile Manager subsystem
121 void FGTileMgr::init() {
122 SG_LOG( SG_TERRAIN, SG_INFO, "Initializing Tile Manager subsystem." );
124 _options = new simgear::SGReaderWriterOptions;
125 _listener = new TileManagerListener(this);
127 materialLibChanged();
128 _options->setPropertyNode(globals->get_props());
130 osgDB::FilePathList &fp = _options->getDatabasePathList();
131 const string_list &sc = globals->get_fg_scenery();
133 std::copy(sc.begin(), sc.end(), back_inserter(fp));
134 _options->setPluginStringData("SimGear::FG_ROOT", globals->get_fg_root());
136 if (globals->get_subsystem("terrasync")) {
137 _options->setPluginStringData("SimGear::TERRASYNC_ROOT", fgGetString("/sim/terrasync/scenery-dir"));
140 if (!_disableNasalHooks->getBoolValue())
141 _options->setModelData(new FGNasalModelDataProxy);
146 void FGTileMgr::reinit()
148 _terra_sync = static_cast<simgear::SGTerraSync*> (globals->get_subsystem("terrasync"));
150 // protect against multiple scenery reloads and properly reset flags,
151 // otherwise aircraft fall through the ground while reloading scenery
152 if (!fgGetBool("/sim/sceneryloaded",true))
154 fgSetBool("/sim/sceneryloaded",false);
155 fgSetDouble("/sim/startup/splash-alpha", 1.0);
157 materialLibChanged();
159 // remove all old scenery nodes from scenegraph and clear cache
160 osg::Group* group = globals->get_scenery()->get_terrain_branch();
161 group->removeChildren(0, group->getNumChildren());
164 // clear OSG cache, except on initial start-up
167 osgDB::Registry::instance()->clearObjectCache();
172 previous_bucket.make_bad();
173 current_bucket.make_bad();
174 scheduled_visibility = 100.0;
176 // force an update now
180 void FGTileMgr::materialLibChanged()
182 _options->setMaterialLib(globals->get_matlib());
183 _options->getMaterialLib()->refreshActiveMaterials();
186 /* schedule a tile for loading, keep request for given amount of time.
187 * Returns true if tile is already loaded. */
188 bool FGTileMgr::sched_tile( const SGBucket& b, double priority, bool current_view, double duration)
190 // see if tile already exists in the cache
191 TileEntry *t = tile_cache.get_tile( b );
194 // create a new entry
195 t = new TileEntry( b );
196 // insert the tile into the cache, update will generate load request
197 if ( tile_cache.insert_tile( t ) )
199 // Attach to scene graph
201 t->addToSceneGraph(globals->get_scenery()->get_terrain_branch());
204 // insert failed (cache full with no available entries to
205 // delete.) Try again later
210 SG_LOG( SG_TERRAIN, SG_DEBUG, " New tile cache size " << (int)tile_cache.get_size() );
213 // update tile's properties
214 tile_cache.request_tile(t,priority,current_view,duration);
216 return t->is_loaded();
219 /* schedule needed buckets for the current view position for loading,
220 * keep request for given amount of time */
221 void FGTileMgr::schedule_needed(const SGBucket& curr_bucket, double vis)
223 // sanity check (unfortunately needed!)
224 if (!curr_bucket.isValid() )
226 SG_LOG( SG_TERRAIN, SG_ALERT,
227 "Attempting to schedule tiles for invalid bucket" );
231 double tile_width = curr_bucket.get_width_m();
232 double tile_height = curr_bucket.get_height_m();
233 SG_LOG( SG_TERRAIN, SG_INFO,
234 "scheduling needed tiles for " << curr_bucket
235 << ", tile-width-m:" << tile_width << ", tile-height-m:" << tile_height);
238 // cout << "tile width = " << tile_width << " tile_height = "
239 // << tile_height << endl;
241 double tileRangeM = std::min(vis,_maxTileRangeM->getDoubleValue());
242 int xrange = (int)(tileRangeM / tile_width) + 1;
243 int yrange = (int)(tileRangeM / tile_height) + 1;
244 if ( xrange < 1 ) { xrange = 1; }
245 if ( yrange < 1 ) { yrange = 1; }
247 // make the cache twice as large to avoid losing terrain when switching
248 // between aircraft and tower views
249 tile_cache.set_max_cache_size( (2*xrange + 2) * (2*yrange + 2) * 2 );
250 // cout << "xrange = " << xrange << " yrange = " << yrange << endl;
251 // cout << "max cache size = " << tile_cache.get_max_cache_size()
252 // << " current cache size = " << tile_cache.get_size() << endl;
254 // clear flags of all tiles belonging to the previous view set
255 tile_cache.clear_current_view();
257 // update timestamps, so all tiles scheduled now are *newer* than any tile previously loaded
258 osg::FrameStamp* framestamp
259 = globals->get_renderer()->getViewer()->getFrameStamp();
260 tile_cache.set_current_time(framestamp->getReferenceTime());
266 /* schedule all tiles, use distance-based loading priority,
267 * so tiles are loaded in innermost-to-outermost sequence. */
268 for ( x = -xrange; x <= xrange; ++x )
270 for ( y = -yrange; y <= yrange; ++y )
272 SGBucket b = curr_bucket.sibling(x, y);
277 float priority = (-1.0) * (x*x+y*y);
278 sched_tile( b, priority, true, 0.0 );
281 _terra_sync->scheduleTile(b);
288 * Update the various queues maintained by the tilemagr (private
289 * internal function, do not call directly.)
291 void FGTileMgr::update_queues(bool& isDownloadingScenery)
293 osg::FrameStamp* framestamp
294 = globals->get_renderer()->getViewer()->getFrameStamp();
295 double current_time = framestamp->getReferenceTime();
296 double vis = _visibilityMeters->getDoubleValue();
300 bool didRefreshMaterialCache = false;
302 tile_cache.set_current_time( current_time );
303 tile_cache.reset_traversal();
305 while ( ! tile_cache.at_end() )
307 e = tile_cache.get_current();
310 // Prepare the ssg nodes corresponding to each tile.
311 // Set the ssg transform and update it's range selector
312 // based on current visibilty
313 e->prep_ssg_node(vis);
315 if (!e->is_loaded()) {
316 if (!didRefreshMaterialCache) {
317 didRefreshMaterialCache = true;
318 globals->get_matlib()->refreshActiveMaterials();
321 bool nonExpiredOrCurrent = !e->is_expired(current_time) || e->is_current_view();
322 bool downloading = isTileDirSyncing(e->tileFileName);
323 isDownloadingScenery |= downloading;
324 if ( !downloading && nonExpiredOrCurrent) {
325 // schedule tile for loading with osg pager
326 _pager->queueRequest(e->tileFileName,
330 e->getDatabaseRequest(),
334 } // of tile not loaded case
336 SG_LOG(SG_TERRAIN, SG_ALERT, "Warning: empty tile in cache!");
342 int drop_count = sz - tile_cache.get_max_cache_size();
343 bool dropTiles = false;
345 dropTiles = ( drop_count > 0 ) && ((loading==0)||(drop_count > 10));
348 drop_count = sz; // no limit on tiles to drop
353 long drop_index = _enableCache ? tile_cache.get_drop_tile() :
354 tile_cache.get_first_invisible_tile();
355 while ( drop_index > -1 )
357 // schedule tile for deletion with osg pager
358 TileEntry* old = tile_cache.get_tile(drop_index);
359 SG_LOG(SG_TERRAIN, SG_ALERT, "Dropping:" << old->get_tile_bucket());
361 tile_cache.clear_entry(drop_index);
363 osg::ref_ptr<osg::Object> subgraph = old->getNode();
364 old->removeFromSceneGraph();
366 // zeros out subgraph ref_ptr, so subgraph is owned by
367 // the pager and will be deleted in the pager thread.
368 _pager->queueDeleteRequest(subgraph);
371 drop_index = tile_cache.get_first_invisible_tile();
372 // limit tiles dropped to drop_count
373 else if (--drop_count > 0)
374 drop_index = tile_cache.get_drop_tile();
378 } // of dropping tiles loop
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 void FGTileMgr::update(double)
386 double vis = _visibilityMeters->getDoubleValue();
387 schedule_tiles_at(globals->get_view_position(), vis);
389 bool waitingOnTerrasync = false;
390 update_queues(waitingOnTerrasync);
392 // scenery loading check, triggers after each sim (tile manager) reinit
393 if (!_scenery_loaded->getBoolValue())
395 bool fdmInited = fgGetBool("sim/fdm-initialized");
396 bool positionFinalized = fgGetBool("sim/position-finalized");
397 bool sceneryOverride = _scenery_override->getBoolValue();
400 // we are done if final position is set and the scenery & FDM are done.
401 // scenery-override can ignore the last two, but not position finalization.
402 if (positionFinalized && (sceneryOverride || (isSceneryLoaded() && fdmInited)))
404 _scenery_loaded->setBoolValue(true);
405 fgSplashProgress("");
409 if (!positionFinalized) {
410 fgSplashProgress("finalize-position");
411 } else if (waitingOnTerrasync) {
412 fgSplashProgress("downloading-scenery");
414 fgSplashProgress("loading-scenery");
417 // be nice to loader threads while waiting for initial scenery, reduce to 20fps
418 SGTimeStamp::sleepForMSec(50);
423 // schedule tiles for the viewer bucket
424 // (FDM/AI/groundcache/... should use "schedule_scenery" instead)
425 void FGTileMgr::schedule_tiles_at(const SGGeod& location, double range_m)
427 // SG_LOG( SG_TERRAIN, SG_DEBUG, "FGTileMgr::update() for "
428 // << longitude << " " << latitude );
430 current_bucket = SGBucket( location );
432 // schedule more tiles when visibility increased considerably
433 // TODO Calculate tile size - instead of using fixed value (5000m)
434 if (range_m - scheduled_visibility > 5000.0)
435 previous_bucket.make_bad();
437 // SG_LOG( SG_TERRAIN, SG_DEBUG, "Updating tile list for "
438 // << current_bucket );
439 fgSetInt( "/environment/current-tile-id", current_bucket.gen_index() );
441 // do tile load scheduling.
442 // Note that we need keep track of both viewer buckets and fdm buckets.
443 if ( state == Running ) {
444 if (last_state != state)
446 SG_LOG( SG_TERRAIN, SG_DEBUG, "State == Running" );
448 if (current_bucket != previous_bucket) {
449 // We've moved to a new bucket, we need to schedule any
450 // needed tiles for loading.
451 SG_LOG( SG_TERRAIN, SG_INFO, "FGTileMgr: at " << location << ", scheduling needed for:" << current_bucket
452 << ", visbility=" << range_m);
453 scheduled_visibility = range_m;
454 schedule_needed(current_bucket, range_m);
458 previous_bucket = current_bucket;
459 } else if ( state == Start || state == Inited ) {
460 SG_LOG( SG_TERRAIN, SG_DEBUG, "State == Start || Inited" );
461 // do not update bucket yet (position not valid in initial loop)
463 previous_bucket.make_bad();
468 /** Schedules scenery for given position. Load request remains valid for given duration
469 * (duration=0.0 => nothing is loaded).
470 * Used for FDM/AI/groundcache/... requests. Viewer uses "schedule_tiles_at" instead.
471 * Returns true when all tiles for the given position are already loaded, false otherwise.
473 bool FGTileMgr::schedule_scenery(const SGGeod& position, double range_m, double duration)
475 // sanity check (unfortunately needed!)
476 if (!position.isValid())
478 const float priority = 0.0;
479 bool available = true;
481 SGBucket bucket(position);
482 available = sched_tile( bucket, priority, false, duration );
484 if ((!available)&&(duration==0.0))
487 SGVec3d cartPos = SGVec3d::fromGeod(position);
489 // Traverse all tiles required to be there for the given visibility.
490 double tile_width = bucket.get_width_m();
491 double tile_height = bucket.get_height_m();
492 double tile_r = 0.5*sqrt(tile_width*tile_width + tile_height*tile_height);
493 double max_dist = tile_r + range_m;
494 double max_dist2 = max_dist*max_dist;
496 int xrange = (int)fabs(range_m / tile_width) + 1;
497 int yrange = (int)fabs(range_m / tile_height) + 1;
499 for ( int x = -xrange; x <= xrange; ++x )
501 for ( int y = -yrange; y <= yrange; ++y )
503 // We have already checked for the center tile.
504 if ( x != 0 || y != 0 )
506 SGBucket b = bucket.sibling(x, y );
511 double distance2 = distSqr(cartPos, SGVec3d::fromGeod(b.get_center()));
512 // Do not ask if it is just the next tile but way out of range.
513 if (distance2 <= max_dist2)
515 available &= sched_tile( b, priority, false, duration );
516 if ((!available)&&(duration==0.0))
526 // Returns true if tiles around current view position have been loaded
527 bool FGTileMgr::isSceneryLoaded()
529 double range_m = 100.0;
530 if (scheduled_visibility < range_m)
531 range_m = scheduled_visibility;
533 return schedule_scenery(globals->get_view_position(), range_m, 0.0);
536 bool FGTileMgr::isTileDirSyncing(const std::string& tileFileName) const
542 std::string nameWithoutExtension = tileFileName.substr(0, tileFileName.size() - 4);
543 long int bucketIndex = simgear::strutils::to_int(nameWithoutExtension);
544 SGBucket bucket(bucketIndex);
546 return _terra_sync->isTileDirPending(bucket.gen_base_path());