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flightgear/src/Scenery/tilemgr.cxx

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// tilemgr.cxx -- routines to handle dynamic management of scenery tiles
//
// Written by Curtis Olson, started January 1998.
//
// Copyright (C) 1997 Curtis L. Olson - http://www.flightgear.org/~curt
//
// This program is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public License as
// published by the Free Software Foundation; either version 2 of the
// License, or (at your option) any later version.
//
// This program is distributed in the hope that it will be useful, but
// WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
// General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
//
// $Id$
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include <algorithm>
#include <functional>
#include <osgViewer/Viewer>
#include <osgDB/Registry>
#include <simgear/constants.h>
#include <simgear/debug/logstream.hxx>
#include <simgear/structure/exception.hxx>
#include <simgear/scene/model/modellib.hxx>
#include <simgear/scene/tgdb/SGReaderWriterBTGOptions.hxx>
#include <simgear/scene/tsync/terrasync.hxx>
#include <Main/globals.hxx>
#include <Main/fg_props.hxx>
#include <Main/renderer.hxx>
#include <Main/viewer.hxx>
#include <Scripting/NasalSys.hxx>
#include "scenery.hxx"
#include "SceneryPager.hxx"
#include "tilemgr.hxx"
using std::for_each;
using flightgear::SceneryPager;
using simgear::SGModelLib;
using simgear::TileEntry;
using simgear::TileCache;
// helper: listen to property changes affecting tile loading
class LoaderPropertyWatcher : public SGPropertyChangeListener
{
public:
LoaderPropertyWatcher(FGTileMgr* pTileMgr) :
_pTileMgr(pTileMgr)
{
}
virtual void valueChanged(SGPropertyNode*)
{
_pTileMgr->configChanged();
}
private:
FGTileMgr* _pTileMgr;
};
FGTileMgr::FGTileMgr():
state( Start ),
vis( 16000 ),
_terra_sync(NULL),
_propListener(new LoaderPropertyWatcher(this))
{
_randomObjects = fgGetNode("/sim/rendering/random-objects", true);
_randomVegetation = fgGetNode("/sim/rendering/random-vegetation", true);
_maxTileRangeM = fgGetNode("/sim/rendering/static-lod/bare", true);
}
FGTileMgr::~FGTileMgr()
{
// remove all nodes we might have left behind
osg::Group* group = globals->get_scenery()->get_terrain_branch();
group->removeChildren(0, group->getNumChildren());
delete _propListener;
_propListener = NULL;
// clear OSG cache
osgDB::Registry::instance()->clearObjectCache();
}
// Initialize the Tile Manager subsystem
void FGTileMgr::init() {
SG_LOG( SG_TERRAIN, SG_INFO, "Initializing Tile Manager subsystem." );
_options = new SGReaderWriterBTGOptions;
_options->setMatlib(globals->get_matlib());
_randomObjects.get()->addChangeListener(_propListener, false);
_randomVegetation.get()->addChangeListener(_propListener, false);
configChanged();
osgDB::FilePathList &fp = _options->getDatabasePathList();
const string_list &sc = globals->get_fg_scenery();
fp.clear();
std::copy(sc.begin(), sc.end(), back_inserter(fp));
TileEntry::setModelLoadHelper(this);
_visibilityMeters = fgGetNode("/environment/visibility-m", true);
reinit();
}
void FGTileMgr::refresh_tile(void* tileMgr, long tileIndex)
{
((FGTileMgr*) tileMgr)->tile_cache.refresh_tile(tileIndex);
}
void FGTileMgr::reinit()
{
// remove all old scenery nodes from scenegraph and clear cache
osg::Group* group = globals->get_scenery()->get_terrain_branch();
group->removeChildren(0, group->getNumChildren());
tile_cache.init();
// clear OSG cache, except on initial start-up
if (state != Start)
{
osgDB::Registry::instance()->clearObjectCache();
}
state = Inited;
previous_bucket.make_bad();
current_bucket.make_bad();
longitude = latitude = -1000.0;
_terra_sync = (simgear::SGTerraSync*) globals->get_subsystem("terrasync");
if (_terra_sync)
_terra_sync->setTileRefreshCb(&refresh_tile, this);
// force an update now
update(0.0);
}
void FGTileMgr::configChanged()
{
_options->setUseRandomObjects(_randomObjects.get()->getBoolValue());
_options->setUseRandomVegetation(_randomVegetation.get()->getBoolValue());
}
/* schedule a tile for loading, keep request for given amount of time.
* Returns true if tile is already loaded. */
bool FGTileMgr::sched_tile( const SGBucket& b, double priority, bool current_view, double duration)
{
// see if tile already exists in the cache
TileEntry *t = tile_cache.get_tile( b );
if (!t)
{
// create a new entry
t = new TileEntry( b );
// insert the tile into the cache, update will generate load request
if ( tile_cache.insert_tile( t ) )
{
// Attach to scene graph
t->addToSceneGraph(globals->get_scenery()->get_terrain_branch());
} else
{
// insert failed (cache full with no available entries to
// delete.) Try again later
delete t;
return false;
}
SG_LOG( SG_TERRAIN, SG_DEBUG, " New tile cache size " << (int)tile_cache.get_size() );
}
// update tile's properties
tile_cache.request_tile(t,priority,current_view,duration);
return t->is_loaded();
}
/* schedule needed buckets for the current view position for loading,
* keep request for given amount of time */
void FGTileMgr::schedule_needed(const SGBucket& curr_bucket, double vis)
{
// sanity check (unfortunately needed!)
if ( longitude < -180.0 || longitude > 180.0
|| latitude < -90.0 || latitude > 90.0 )
{
SG_LOG( SG_TERRAIN, SG_ALERT,
"Attempting to schedule tiles for bogus lon and lat = ("
<< longitude << "," << latitude << ")" );
return;
}
SG_LOG( SG_TERRAIN, SG_INFO,
"scheduling needed tiles for " << longitude << " " << latitude );
double tile_width = curr_bucket.get_width_m();
double tile_height = curr_bucket.get_height_m();
// cout << "tile width = " << tile_width << " tile_height = "
// << tile_height << endl;
double tileRangeM = std::min(vis,_maxTileRangeM->getDoubleValue());
xrange = (int)(tileRangeM / tile_width) + 1;
yrange = (int)(tileRangeM / tile_height) + 1;
if ( xrange < 1 ) { xrange = 1; }
if ( yrange < 1 ) { yrange = 1; }
// make the cache twice as large to avoid losing terrain when switching
// between aircraft and tower views
tile_cache.set_max_cache_size( (2*xrange + 2) * (2*yrange + 2) * 2 );
// cout << "xrange = " << xrange << " yrange = " << yrange << endl;
// cout << "max cache size = " << tile_cache.get_max_cache_size()
// << " current cache size = " << tile_cache.get_size() << endl;
// clear flags of all tiles belonging to the previous view set
tile_cache.clear_current_view();
// update timestamps, so all tiles scheduled now are *newer* than any tile previously loaded
osg::FrameStamp* framestamp
= globals->get_renderer()->getViewer()->getFrameStamp();
tile_cache.set_current_time(framestamp->getReferenceTime());
SGBucket b;
int x, y;
/* schedule all tiles, use distance-based loading priority,
* so tiles are loaded in innermost-to-outermost sequence. */
for ( x = -xrange; x <= xrange; ++x )
{
for ( y = -yrange; y <= yrange; ++y )
{
SGBucket b = sgBucketOffset( longitude, latitude, x, y );
float priority = (-1.0) * (x*x+y*y);
sched_tile( b, priority, true, 0.0 );
}
}
}
osg::Node*
FGTileMgr::loadTileModel(const string& modelPath, bool cacheModel)
{
SGPath fullPath = modelPath;
if ((fullPath.isRelative())&&
(fgGetBool("/sim/paths/use-custom-scenery-data") == true)) {
string_list sc = globals->get_fg_scenery();
for (string_list_iterator it = sc.begin(); it != sc.end(); ++it) {
// fg_senery contains empty strings as "markers" (see FGGlobals::set_fg_scenery)
if (!it->empty()) {
SGPath tmpPath(*it);
tmpPath.append(modelPath);
if (tmpPath.exists()) {
fullPath = tmpPath;
break;
}
}
}
}
osg::Node* result = 0;
try {
if(cacheModel)
result =
SGModelLib::loadModel(fullPath.str(), globals->get_props(),
new FGNasalModelData);
else
result=
SGModelLib::loadDeferredModel(fullPath.str(), globals->get_props(),
new FGNasalModelData);
} catch (const sg_io_exception& exc) {
string m(exc.getMessage());
m += " ";
m += exc.getLocation().asString();
SG_LOG( SG_TERRAIN, SG_ALERT, m );
} catch (const sg_exception& exc) { // XXX may be redundant
SG_LOG( SG_TERRAIN, SG_ALERT, exc.getMessage());
}
return result;
}
/**
* Update the various queues maintained by the tilemagr (private
* internal function, do not call directly.)
*/
void FGTileMgr::update_queues()
{
SceneryPager* pager = FGScenery::getPagerSingleton();
osg::FrameStamp* framestamp
= globals->get_renderer()->getViewer()->getFrameStamp();
double current_time = framestamp->getReferenceTime();
double vis = _visibilityMeters->getDoubleValue();
TileEntry *e;
int loading=0;
int sz=0;
tile_cache.set_current_time( current_time );
tile_cache.reset_traversal();
while ( ! tile_cache.at_end() )
{
e = tile_cache.get_current();
// cout << "processing a tile" << endl;
if ( e )
{
// Prepare the ssg nodes corresponding to each tile.
// Set the ssg transform and update it's range selector
// based on current visibilty
e->prep_ssg_node(vis);
if (( !e->is_loaded() )&&
((!e->is_expired(current_time))||
e->is_current_view() ))
{
// schedule tile for loading with osg pager
pager->queueRequest(e->tileFileName,
e->getNode(),
e->get_priority(),
framestamp,
e->getDatabaseRequest(),
_options.get());
loading++;
}
} else
{
SG_LOG(SG_TERRAIN, SG_ALERT, "Warning: empty tile in cache!");
}
tile_cache.next();
sz++;
}
int drop_count = sz - tile_cache.get_max_cache_size();
if (( drop_count > 0 )&&
((loading==0)||(drop_count > 10)))
{
long drop_index = tile_cache.get_drop_tile();
while ( drop_index > -1 )
{
// schedule tile for deletion with osg pager
TileEntry* old = tile_cache.get_tile(drop_index);
tile_cache.clear_entry(drop_index);
osg::ref_ptr<osg::Object> subgraph = old->getNode();
old->removeFromSceneGraph();
delete old;
// zeros out subgraph ref_ptr, so subgraph is owned by
// the pager and will be deleted in the pager thread.
pager->queueDeleteRequest(subgraph);
if (--drop_count > 0)
drop_index = tile_cache.get_drop_tile();
else
drop_index = -1;
}
}
}
// given the current lon/lat (in degrees), fill in the array of local
// chunks. If the chunk isn't already in the cache, then read it from
// disk.
void FGTileMgr::update(double)
{
SG_LOG( SG_TERRAIN, SG_DEBUG, "FGTileMgr::update()" );
SGVec3d viewPos = globals->get_current_view()->get_view_pos();
double vis = _visibilityMeters->getDoubleValue();
schedule_tiles_at(SGGeod::fromCart(viewPos), vis);
update_queues();
}
// schedule tiles for the viewer bucket (FDM/AI/groundcache/... use
// "schedule_scenery" instead
int FGTileMgr::schedule_tiles_at(const SGGeod& location, double range_m)
{
longitude = location.getLongitudeDeg();
latitude = location.getLatitudeDeg();
// SG_LOG( SG_TERRAIN, SG_DEBUG, "FGTileMgr::update() for "
// << longitude << " " << latatitude );
current_bucket.set_bucket( location );
// schedule more tiles when visibility increased considerably
// TODO Calculate tile size - instead of using fixed value (5000m)
if (range_m-scheduled_visibility > 5000.0)
previous_bucket.make_bad();
// SG_LOG( SG_TERRAIN, SG_DEBUG, "Updating tile list for "
// << current_bucket );
fgSetInt( "/environment/current-tile-id", current_bucket.gen_index() );
// do tile load scheduling.
// Note that we need keep track of both viewer buckets and fdm buckets.
if ( state == Running ) {
SG_LOG( SG_TERRAIN, SG_DEBUG, "State == Running" );
if (current_bucket != previous_bucket) {
// We've moved to a new bucket, we need to schedule any
// needed tiles for loading.
SG_LOG( SG_TERRAIN, SG_INFO, "FGTileMgr::update()" );
scheduled_visibility = range_m;
schedule_needed(current_bucket, range_m);
if (_terra_sync)
_terra_sync->schedulePosition(latitude,longitude);
}
// save bucket
previous_bucket = current_bucket;
} else if ( state == Start || state == Inited ) {
SG_LOG( SG_TERRAIN, SG_INFO, "State == Start || Inited" );
// do not update bucket yet (position not valid in initial loop)
state = Running;
previous_bucket.make_bad();
}
return 1;
}
/** Schedules scenery for given position. Load request remains valid for given duration
* (duration=0.0 => nothing is loaded).
* Used for FDM/AI/groundcache/... requests. Viewer uses "schedule_tiles_at" instead.
* Returns true when all tiles for the given position are already loaded, false otherwise.
*/
bool FGTileMgr::schedule_scenery(const SGGeod& position, double range_m, double duration)
{
const float priority = 0.0;
double current_longitude = position.getLongitudeDeg();
double current_latitude = position.getLatitudeDeg();
bool available = true;
// sanity check (unfortunately needed!)
if (current_longitude < -180 || current_longitude > 180 ||
current_latitude < -90 || current_latitude > 90)
return false;
SGBucket bucket(position);
available = sched_tile( bucket, priority, false, duration );
if ((!available)&&(duration==0.0))
return false;
SGVec3d cartPos = SGVec3d::fromGeod(position);
// Traverse all tiles required to be there for the given visibility.
double tile_width = bucket.get_width_m();
double tile_height = bucket.get_height_m();
double tile_r = 0.5*sqrt(tile_width*tile_width + tile_height*tile_height);
double max_dist = tile_r + range_m;
double max_dist2 = max_dist*max_dist;
int xrange = (int)fabs(range_m / tile_width) + 1;
int yrange = (int)fabs(range_m / tile_height) + 1;
for ( int x = -xrange; x <= xrange; ++x )
{
for ( int y = -yrange; y <= yrange; ++y )
{
// We have already checked for the center tile.
if ( x != 0 || y != 0 )
{
SGBucket b = sgBucketOffset( current_longitude,
current_latitude, x, y );
double distance2 = distSqr(cartPos, SGVec3d::fromGeod(b.get_center()));
// Do not ask if it is just the next tile but way out of range.
if (distance2 <= max_dist2)
{
available &= sched_tile( b, priority, false, duration );
if ((!available)&&(duration==0.0))
return false;
}
}
}
}
return available;
}
// Returns true if tiles around current view position have been loaded
bool FGTileMgr::isSceneryLoaded()
{
double range_m = 100.0;
if (scheduled_visibility < range_m)
range_m = scheduled_visibility;
return schedule_scenery(SGGeod::fromDeg(longitude, latitude), range_m, 0.0);
}
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