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flightgear/src/Scenery/tilemgr.cxx
timoore fd492a297a model paging patch from Till Busch 
From Till:
i started the project at the end of february with a simple idea: move all
3d-model loading to the DatabasePager-thread. my first attempts looked
promising, though they were a little too optimistic (or naive?). the patch
has evolved a lot since.

currently it does the following things:
1. revive SGModelLib, move functions for xml-model-loading there

2. replace all calls to sgLoad3dModel with calls to either
SGModelLib::loadModel() or SGModelLib::loadPagedModel()
almost all models will be loaded by the DatabasePager. the few exceptions are:
your own plane, shared models in scenery, random objects, AIBallistic models.

3. simplify mode-loading functions (avoid passing around fg_root)

4. avoid supurious MatrixTransform nodes in loaded models

5. fix some memory leaks
2008-03-22 09:31:06 +00:00

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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 <simgear/constants.h>
#include <simgear/debug/logstream.hxx>
#include <simgear/math/point3d.hxx>
#include <simgear/math/polar3d.hxx>
#include <simgear/math/sg_geodesy.hxx>
#include <simgear/math/vector.hxx>
#include <simgear/structure/exception.hxx>
#include <simgear/scene/model/modellib.hxx>
#include <Main/globals.hxx>
#include <Main/fg_props.hxx>
#include <Main/renderer.hxx>
#include <Main/viewer.hxx>
#include <Scripting/NasalSys.hxx>
#include "newcache.hxx"
#include "scenery.hxx"
#include "SceneryPager.hxx"
#include "tilemgr.hxx"
using std::for_each;
using flightgear::SceneryPager;
using simgear::SGModelLib;
#define TEST_LAST_HIT_CACHE
// Constructor
FGTileMgr::FGTileMgr():
state( Start ),
current_tile( NULL ),
vis( 16000 )
{
}
// Destructor
FGTileMgr::~FGTileMgr() {
}
// Initialize the Tile Manager subsystem
int FGTileMgr::init() {
SG_LOG( SG_TERRAIN, SG_INFO, "Initializing Tile Manager subsystem." );
tile_cache.init();
state = Inited;
previous_bucket.make_bad();
current_bucket.make_bad();
longitude = latitude = -1000.0;
return 1;
}
// schedule a tile for loading
void FGTileMgr::sched_tile( const SGBucket& b, const bool is_inner_ring ) {
// see if tile already exists in the cache
FGTileEntry *t = tile_cache.get_tile( b );
if ( t == NULL ) {
// make space in the cache
SceneryPager* pager = FGScenery::getPagerSingleton();
while ( (int)tile_cache.get_size() > tile_cache.get_max_cache_size() ) {
long index = tile_cache.get_oldest_tile();
if ( index >= 0 ) {
FGTileEntry *old = tile_cache.get_tile( index );
tile_cache.clear_entry( index );
osg::ref_ptr<osg::Object> subgraph = old->getNode();
old->disconnect_ssg_nodes();
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);
} else {
// nothing to free ?!? forge ahead
break;
}
}
// create a new entry
FGTileEntry *e = new FGTileEntry( b );
// insert the tile into the cache
if ( tile_cache.insert_tile( e ) ) {
// update_queues will generate load request
} else {
// insert failed (cache full with no available entries to
// delete.) Try again later
delete e;
}
// Attach to scene graph
e->add_ssg_nodes(globals->get_scenery()->get_terrain_branch());
} else {
t->set_inner_ring( is_inner_ring );
}
}
// schedule a needed buckets for loading
void FGTileMgr::schedule_needed( double vis, const SGBucket& curr_bucket) {
// 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; // FIXME
SG_LOG( SG_TERRAIN, SG_ALERT,
"This is a FATAL error. Exiting!" );
exit(-1);
}
SG_LOG( SG_TERRAIN, SG_INFO,
"scheduling needed tiles for " << longitude << " " << latitude );
// vis = fgGetDouble("/environment/visibility-m");
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;
xrange = (int)(vis / tile_width) + 1;
yrange = (int)(vis / tile_height) + 1;
if ( xrange < 1 ) { xrange = 1; }
if ( yrange < 1 ) { yrange = 1; }
// note * 2 at end doubles cache size (for fdm and viewer)
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 the inner ring flags so we can set them below. This
// prevents us from having "true" entries we aren't able to find
// to get rid of if we teleport a long ways away from the current
// location.
tile_cache.clear_inner_ring_flags();
SGBucket b;
// schedule center tile first so it can be loaded first
b = sgBucketOffset( longitude, latitude, 0, 0 );
sched_tile( b, true );
int x, y;
// schedule next ring of 8 tiles
for ( x = -1; x <= 1; ++x ) {
for ( y = -1; y <= 1; ++y ) {
if ( x != 0 || y != 0 ) {
b = sgBucketOffset( longitude, latitude, x, y );
sched_tile( b, true );
}
}
}
// schedule remaining tiles
for ( x = -xrange; x <= xrange; ++x ) {
for ( y = -yrange; y <= yrange; ++y ) {
if ( x < -1 || x > 1 || y < -1 || y > 1 ) {
SGBucket b = sgBucketOffset( longitude, latitude, x, y );
sched_tile( b, false );
}
}
}
}
void FGTileMgr::initialize_queue()
{
// First time through or we have teleported, initialize the
// system and load all relavant tiles
SG_LOG( SG_TERRAIN, SG_INFO, "Initialize_queue(): Updating Tile list for "
<< current_bucket );
// cout << "tile cache size = " << tile_cache.get_size() << endl;
// wipe/initialize tile cache
// tile_cache.init();
previous_bucket.make_bad();
// build the local area list and schedule tiles for loading
// start with the center tile and work out in concentric
// "rings"
double visibility_meters = fgGetDouble("/environment/visibility-m");
schedule_needed(visibility_meters, current_bucket);
// do we really want to lose this? CLO
#if 0
// Now force a load of the center tile and inner ring so we
// have something to see in our first frame.
int i;
for ( i = 0; i < 9; ++i ) {
if ( load_queue.size() ) {
SG_LOG( SG_TERRAIN, SG_DEBUG,
"Load queue not empty, loading a tile" );
SGBucket pending = load_queue.front();
load_queue.pop_front();
load_tile( pending );
}
}
#endif
}
osg::Node*
FGTileMgr::loadTileModel(const string& modelPath, bool cacheModel)
{
osg::Node* result = 0;
try {
if(cacheModel)
{
result =
SGModelLib::loadModel(modelPath, globals->get_props(),
new FGNasalModelData);
}
else
{
result=
SGModelLib::loadPagedModel(modelPath, globals->get_props(),
new FGNasalModelData);
}
} catch (const sg_io_exception& exc) {
string m(exc.getMessage());
m += " ";
m += exc.getLocation().asString();
SG_LOG( SG_ALL, SG_ALERT, m );
} catch (const sg_exception& exc) { // XXX may be redundant
SG_LOG( SG_ALL, SG_ALERT, exc.getMessage());
}
return result;
}
// Helper class for STL fun
class TileLoad : public std::unary_function<FGNewCache::tile_map::value_type,
void>
{
public:
TileLoad(SceneryPager *pager, osg::FrameStamp* framestamp,
osg::Group* terrainBranch) :
_pager(pager), _framestamp(framestamp) {}
TileLoad(const TileLoad& rhs) :
_pager(rhs._pager), _framestamp(rhs._framestamp) {}
void operator()(FGNewCache::tile_map::value_type& tilePair)
{
FGTileEntry* entry = tilePair.second;
if (entry->getNode()->getNumChildren() == 0) {
_pager->queueRequest(entry->tileFileName,
entry->getNode(),
entry->get_inner_ring() ? 10.0f : 1.0f,
_framestamp);
}
}
private:
SceneryPager* _pager;
osg::FrameStamp* _framestamp;
};
/**
* Update the various queues maintained by the tilemagr (private
* internal function, do not call directly.)
*/
void FGTileMgr::update_queues()
{
SceneryPager* pager = FGScenery::getPagerSingleton();
for_each(tile_cache.begin(), tile_cache.end(),
TileLoad(pager,
globals->get_renderer()->getViewer()->getFrameStamp(),
globals->get_scenery()->get_terrain_branch()));
}
// 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.
int FGTileMgr::update( double visibility_meters )
{
SGLocation *location = globals->get_current_view()->getSGLocation();
return update( location, visibility_meters );
}
int FGTileMgr::update( SGLocation *location, double visibility_meters )
{
SG_LOG( SG_TERRAIN, SG_DEBUG, "FGTileMgr::update()" );
longitude = location->getLongitude_deg();
latitude = location->getLatitude_deg();
// add 1.0m to the max altitude to give a little leeway to the
// ground reaction code.
altitude_m = location->getAltitudeASL_ft() * SG_FEET_TO_METER + 1.0;
// if current altitude is apparently not initialized, set max
// altitude to something big.
if ( altitude_m < -1000 ) {
altitude_m = 10000;
}
// SG_LOG( SG_TERRAIN, SG_DEBUG, "FGTileMgr::update() for "
// << longitude << " " << latatitude );
current_bucket.set_bucket( longitude, latitude );
// 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()" );
schedule_needed(visibility_meters, current_bucket);
}
} else if ( state == Start || state == Inited ) {
SG_LOG( SG_TERRAIN, SG_INFO, "State == Start || Inited" );
// initialize_queue();
state = Running;
if (current_bucket != previous_bucket
&& current_bucket.get_chunk_lon() != -1000) {
SG_LOG( SG_TERRAIN, SG_INFO, "FGTileMgr::update()" );
schedule_needed(visibility_meters, current_bucket);
}
}
update_queues();
// save bucket...
previous_bucket = current_bucket;
return 1;
}
void FGTileMgr::prep_ssg_nodes(float vis) {
// traverse the potentially viewable tile list and update range
// selector and transform
FGTileEntry *e;
tile_cache.reset_traversal();
while ( ! tile_cache.at_end() ) {
// cout << "processing a tile" << endl;
if ( (e = tile_cache.get_current()) ) {
e->prep_ssg_node(vis);
} else {
SG_LOG(SG_INPUT, SG_ALERT, "warning ... empty tile in cache");
}
tile_cache.next();
}
}
bool FGTileMgr::scenery_available(double lat, double lon, double range_m)
{
// sanity check (unfortunately needed!)
if ( lon <= -180.0 || lon >= 180.0 || lat <= -90.0 || lat >= 90.0 )
return false;
SGBucket bucket(lon, lat);
FGTileEntry *te = tile_cache.get_tile(bucket);
if (!te || !te->is_loaded())
return false;
// Traverse all tiles required to be there for the given visibility.
// This uses exactly the same algorithm like the tile scheduler.
double tile_width = bucket.get_width_m();
double tile_height = bucket.get_height_m();
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( lon, lat, x, y );
FGTileEntry *te = tile_cache.get_tile(b);
if (!te || !te->is_loaded())
return false;
}
}
}
// Survived all tests.
return true;
}
namespace
{
struct IsTileLoaded :
public std::unary_function<FGNewCache::tile_map::value_type, bool>
{
bool operator()(const FGNewCache::tile_map::value_type& tilePair) const
{
return tilePair.second->is_loaded();
}
};
}
bool FGTileMgr::isSceneryLoaded()
{
return (std::find_if(tile_cache.begin(), tile_cache.end(),
std::not1(IsTileLoaded()))
== tile_cache.end());
}
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