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flightgear/src/Scenery/tileentry.cxx
frohlich 4317dbf729 Modified Files: 
src/Scenery/tileentry.cxx: Jonathan Wagner:
	Removes black dots by accounting for radius of nodes
	when calculating visible nodes for traversal without removing the
	optimization.  Confirmed fix with a few people on IRC.
2007-05-26 13:51:23 +00:00

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// tileentry.cxx -- routines to handle a scenery tile
//
// Written by Curtis Olson, started May 1998.
//
// Copyright (C) 1998 - 2001 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 <simgear/compiler.h>
#include <plib/ul.h>
#include <Main/main.hxx>
#include STL_STRING
#include <osg/Array>
#include <osg/Geometry>
#include <osg/Geode>
#include <osg/LOD>
#include <osg/MatrixTransform>
#include <osg/NodeCallback>
#include <osg/Switch>
#include <simgear/bucket/newbucket.hxx>
#include <simgear/debug/logstream.hxx>
#include <simgear/math/polar3d.hxx>
#include <simgear/math/sg_geodesy.hxx>
#include <simgear/math/sg_random.h>
#include <simgear/misc/sgstream.hxx>
#include <simgear/scene/material/mat.hxx>
#include <simgear/scene/material/matlib.hxx>
#include <simgear/scene/tgdb/apt_signs.hxx>
#include <simgear/scene/tgdb/obj.hxx>
#include <simgear/scene/model/placementtrans.hxx>
#include <simgear/scene/util/SGUpdateVisitor.hxx>
#include <Aircraft/aircraft.hxx>
#include <Include/general.hxx>
#include <Main/fg_props.hxx>
#include <Main/globals.hxx>
#include <Main/viewer.hxx>
#include <Scenery/scenery.hxx>
#include <Time/light.hxx>
#include "tileentry.hxx"
#include "tilemgr.hxx"
SG_USING_STD(string);
// FIXME: investigate what huge update flood is clamped away here ...
class FGTileUpdateCallback : public osg::NodeCallback {
public:
virtual void operator()(osg::Node* node, osg::NodeVisitor* nv)
{
assert(dynamic_cast<SGUpdateVisitor*>(nv));
SGUpdateVisitor* updateVisitor = static_cast<SGUpdateVisitor*>(nv);
osg::Vec3 center = node->getBound().center();
double distance = dist(updateVisitor->getGlobalEyePos(),
SGVec3d(center[0], center[1], center[2]));
if (updateVisitor->getVisibility() + node->getBound().radius() < distance)
return;
traverse(node, nv);
}
};
// Constructor
FGTileEntry::FGTileEntry ( const SGBucket& b )
: tile_bucket( b ),
terra_transform( new osg::Group ),
terra_range( new osg::LOD ),
loaded(false),
pending_models(0),
is_inner_ring(false),
free_tracker(0)
{
terra_transform->setUpdateCallback(new FGTileUpdateCallback);
}
// Destructor
FGTileEntry::~FGTileEntry () {
}
static void WorldCoordinate( osg::Matrix& obj_pos, double lat,
double lon, double elev, double hdg )
{
double lon_rad = lon * SGD_DEGREES_TO_RADIANS;
double lat_rad = lat * SGD_DEGREES_TO_RADIANS;
double hdg_rad = hdg * SGD_DEGREES_TO_RADIANS;
// setup transforms
Point3D geod( lon_rad, lat_rad, elev );
Point3D world_pos = sgGeodToCart( geod );
Point3D offset = world_pos;
sgdMat4 mat;
double sin_lat = sin( lat_rad );
double cos_lat = cos( lat_rad );
double cos_lon = cos( lon_rad );
double sin_lon = sin( lon_rad );
double sin_hdg = sin( hdg_rad ) ;
double cos_hdg = cos( hdg_rad ) ;
mat[0][0] = cos_hdg * sin_lat * cos_lon - sin_hdg * sin_lon;
mat[0][1] = cos_hdg * sin_lat * sin_lon + sin_hdg * cos_lon;
mat[0][2] = -cos_hdg * cos_lat;
mat[0][3] = SG_ZERO;
mat[1][0] = -sin_hdg * sin_lat * cos_lon - cos_hdg * sin_lon;
mat[1][1] = -sin_hdg * sin_lat * sin_lon + cos_hdg * cos_lon;
mat[1][2] = sin_hdg * cos_lat;
mat[1][3] = SG_ZERO;
mat[2][0] = cos_lat * cos_lon;
mat[2][1] = cos_lat * sin_lon;
mat[2][2] = sin_lat;
mat[2][3] = SG_ZERO;
mat[3][0] = offset.x();
mat[3][1] = offset.y();
mat[3][2] = offset.z();
mat[3][3] = SG_ONE ;
for (unsigned i = 0; i < 4; ++i)
for (unsigned j = 0; j < 4; ++j)
obj_pos(i, j) = mat[i][j];
}
// Free "n" leaf elements of an ssg tree. returns the number of
// elements freed. An empty branch node is considered a leaf. This
// is intended to spread the load of freeing a complex tile out over
// several frames.
static int fgPartialFreeSSGtree( osg::Group *b, int n ) {
int num_deletes = b->getNumChildren();
b->removeChildren(0, b->getNumChildren());
return num_deletes;
}
// Clean up the memory used by this tile and delete the arrays used by
// ssg as well as the whole ssg branch
bool FGTileEntry::free_tile() {
int delete_size = 100;
SG_LOG( SG_TERRAIN, SG_DEBUG,
"FREEING TILE = (" << tile_bucket << ")" );
SG_LOG( SG_TERRAIN, SG_DEBUG, "(start) free_tracker = " << free_tracker );
if ( !(free_tracker & NODES) ) {
free_tracker |= NODES;
} else if ( !(free_tracker & VEC_PTRS) ) {
free_tracker |= VEC_PTRS;
} else if ( !(free_tracker & TERRA_NODE) ) {
// delete the terrain branch (this should already have been
// disconnected from the scene graph)
SG_LOG( SG_TERRAIN, SG_DEBUG, "FREEING terra_transform" );
if ( fgPartialFreeSSGtree( terra_transform.get(), delete_size ) == 0 ) {
terra_transform = 0;
free_tracker |= TERRA_NODE;
}
} else if ( !(free_tracker & LIGHTMAPS) ) {
free_tracker |= LIGHTMAPS;
} else {
return true;
}
SG_LOG( SG_TERRAIN, SG_DEBUG, "(end) free_tracker = " << free_tracker );
// if we fall down to here, we still have work todo, return false
return false;
}
// Update the ssg transform node for this tile so it can be
// properly drawn relative to our (0,0,0) point
void FGTileEntry::prep_ssg_node(float vis) {
if ( !loaded ) return;
// visibility can change from frame to frame so we update the
// range selector cutoff's each time.
float bounding_radius = terra_range->getChild(0)->getBound().radius();
terra_range->setRange( 0, 0, vis + bounding_radius );
}
bool FGTileEntry::obj_load( const string& path,
osg::Group *geometry, bool is_base )
{
bool use_random_objects =
fgGetBool("/sim/rendering/random-objects", true);
// try loading binary format
osg::Node* node = SGLoadBTG(path, globals->get_matlib(), is_base, use_random_objects);
if (node)
geometry->addChild(node);
return node;
}
typedef enum {
OBJECT,
OBJECT_SHARED,
OBJECT_STATIC,
OBJECT_SIGN,
OBJECT_RUNWAY_SIGN
} object_type;
// storage class for deferred object processing in FGTileEntry::load()
struct Object {
Object(object_type t, const string& token, const SGPath& p, istream& in)
: type(t), path(p)
{
in >> name;
if (type != OBJECT)
in >> lon >> lat >> elev >> hdg;
in >> ::skipeol;
if (type == OBJECT)
SG_LOG(SG_TERRAIN, SG_INFO, " " << token << " " << name);
else
SG_LOG(SG_TERRAIN, SG_INFO, " " << token << " " << name << " lon=" <<
lon << " lat=" << lat << " elev=" << elev << " hdg=" << hdg);
}
object_type type;
string name;
SGPath path;
double lon, lat, elev, hdg;
};
void
FGTileEntry::load( const string_list &path_list, bool is_base )
{
bool found_tile_base = false;
SGPath object_base;
vector<const Object*> objects;
string index_str = tile_bucket.gen_index_str();
SG_LOG( SG_TERRAIN, SG_INFO, "Loading tile " << index_str );
// scan and parse all files and store information
for (unsigned int i = 0; i < path_list.size(); i++) {
// If we found a terrain tile in Terrain/, we have to process the
// Objects/ dir in the same group, too, before we can stop scanning.
// FGGlobals::set_fg_scenery() inserts an empty string to path_list
// as marker.
if (path_list[i].empty()) {
if (found_tile_base)
break;
else
continue;
}
bool has_base = false;
SGPath tile_path = path_list[i];
tile_path.append( tile_bucket.gen_base_path() );
SGPath basename = tile_path;
basename.append( index_str );
SG_LOG( SG_TERRAIN, SG_INFO, " Trying " << basename.str() );
// Check for master .stg (scene terra gear) file
SGPath stg_name = basename;
stg_name.concat( ".stg" );
sg_gzifstream in( stg_name.str() );
if ( !in.is_open() )
continue;
while ( ! in.eof() ) {
string token;
in >> token;
if ( token[0] == '#' ) {
in >> ::skipeol;
continue;
}
// Load only once (first found)
if ( token == "OBJECT_BASE" ) {
string name;
in >> name >> ::skipws;
SG_LOG( SG_TERRAIN, SG_INFO, " " << token << " " << name );
if (!found_tile_base) {
found_tile_base = true;
has_base = true;
object_base = tile_path;
object_base.append(name);
} else
SG_LOG(SG_TERRAIN, SG_INFO, " (skipped)");
// Load only if base is not in another file
} else if ( token == "OBJECT" ) {
if (!found_tile_base || has_base)
objects.push_back(new Object(OBJECT, token, tile_path, in));
else {
string name;
in >> name >> ::skipeol;
SG_LOG(SG_TERRAIN, SG_INFO, " " << token << " "
<< name << " (skipped)");
}
// Always OK to load
} else if ( token == "OBJECT_STATIC" ) {
objects.push_back(new Object(OBJECT_STATIC, token, tile_path, in));
} else if ( token == "OBJECT_SHARED" ) {
objects.push_back(new Object(OBJECT_SHARED, token, tile_path, in));
} else if ( token == "OBJECT_SIGN" ) {
objects.push_back(new Object(OBJECT_SIGN, token, tile_path, in));
} else if ( token == "OBJECT_RUNWAY_SIGN" ) {
objects.push_back(new Object(OBJECT_RUNWAY_SIGN, token, tile_path, in));
} else {
SG_LOG( SG_TERRAIN, SG_DEBUG,
"Unknown token '" << token << "' in " << stg_name.str() );
in >> ::skipws;
}
}
}
// obj_load() will generate ground lighting for us ...
osg::Group* new_tile = new osg::Group;
if (found_tile_base) {
// load tile if found ...
obj_load( object_base.str(), new_tile, true );
} else {
// ... or generate an ocean tile on the fly
SG_LOG(SG_TERRAIN, SG_INFO, " Generating ocean tile");
if ( !SGGenTile( path_list[0], tile_bucket,
globals->get_matlib(), new_tile ) ) {
SG_LOG( SG_TERRAIN, SG_ALERT,
"Warning: failed to generate ocean tile!" );
}
}
// now that we have a valid center, process all the objects
for (unsigned int j = 0; j < objects.size(); j++) {
const Object *obj = objects[j];
if (obj->type == OBJECT) {
SGPath custom_path = obj->path;
custom_path.append( obj->name );
obj_load( custom_path.str(), new_tile, false );
} else if (obj->type == OBJECT_SHARED || obj->type == OBJECT_STATIC) {
// object loading is deferred to main render thread,
// but lets figure out the paths right now.
SGPath custom_path;
if ( obj->type == OBJECT_STATIC ) {
custom_path = obj->path;
} else {
custom_path = globals->get_fg_root();
}
custom_path.append( obj->name );
osg::Matrix obj_pos;
WorldCoordinate( obj_pos, obj->lat, obj->lon, obj->elev, obj->hdg );
osg::MatrixTransform *obj_trans = new osg::MatrixTransform;
obj_trans->setMatrix( obj_pos );
// wire as much of the scene graph together as we can
new_tile->addChild( obj_trans );
pending_models++;
// push an entry onto the model load queue
FGDeferredModel *dm
= new FGDeferredModel( custom_path.str(),
obj->path.str(),
tile_bucket,
this, obj_trans,
obj->type == OBJECT_SHARED );
FGTileMgr::model_ready( dm );
} else if (obj->type == OBJECT_SIGN || obj->type == OBJECT_RUNWAY_SIGN) {
// load the object itself
SGPath custom_path = obj->path;
custom_path.append( obj->name );
osg::Matrix obj_pos;
WorldCoordinate( obj_pos, obj->lat, obj->lon, obj->elev, obj->hdg );
osg::MatrixTransform *obj_trans = new osg::MatrixTransform;
obj_trans->setMatrix( obj_pos );
osg::Node *custom_obj = 0;
if (obj->type == OBJECT_SIGN)
custom_obj = SGMakeSign(globals->get_matlib(), custom_path.str(), obj->name);
else
custom_obj = SGMakeRunwaySign(globals->get_matlib(), custom_path.str(), obj->name);
// wire the pieces together
if ( custom_obj != NULL ) {
obj_trans -> addChild( custom_obj );
}
new_tile->addChild( obj_trans );
}
delete obj;
}
terra_range->addChild( new_tile );
terra_transform->addChild( terra_range.get() );
}
void
FGTileEntry::add_ssg_nodes( osg::Group *terrain_branch )
{
// bump up the ref count so we can remove this later without
// having ssg try to free the memory.
terrain_branch->addChild( terra_transform.get() );
SG_LOG( SG_TERRAIN, SG_DEBUG,
"connected a tile into scene graph. terra_transform = "
<< terra_transform.get() );
SG_LOG( SG_TERRAIN, SG_DEBUG, "num parents now = "
<< terra_transform->getNumParents() );
loaded = true;
}
void
FGTileEntry::disconnect_ssg_nodes()
{
SG_LOG( SG_TERRAIN, SG_DEBUG, "disconnecting ssg nodes" );
if ( ! loaded ) {
SG_LOG( SG_TERRAIN, SG_DEBUG, "removing a not-fully loaded tile!" );
} else {
SG_LOG( SG_TERRAIN, SG_DEBUG, "removing a fully loaded tile! terra_transform = " << terra_transform.get() );
}
// find the terrain branch parent
int pcount = terra_transform->getNumParents();
if ( pcount > 0 ) {
// find the first parent (should only be one)
osg::Group *parent = terra_transform->getParent( 0 ) ;
if( parent ) {
// disconnect the tile (we previously ref()'d it so it
// won't get freed now)
parent->removeChild( terra_transform.get() );
} else {
SG_LOG( SG_TERRAIN, SG_ALERT,
"parent pointer is NULL! Dying" );
exit(-1);
}
} else {
SG_LOG( SG_TERRAIN, SG_ALERT,
"Parent count is zero for an ssg tile! Dying" );
exit(-1);
}
}
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