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flightgear/src/Scenery/scenery.cxx
Edward d'Auvergne 97f8cdaaea Fix for the particle system. 
The problem was that the change to make FGScenery a standard subsystem caused
the particle OSG group to no longer be inserted into the scene graph.  The
solution was to convert the particle group to be set up as a standard branch of
the scene graph, alongside the terrain, models, aircraft, and interior branches.
The particle system is now set up as part of the init() subsystem function call,
so it is compatible with the new subsystem design.
2016-02-16 17:33:40 +01:00

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// scenery.cxx -- data structures and routines for managing scenery.
//
// Written by Curtis Olson, started May 1997.
//
// 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 <stdio.h>
#include <string.h>
#include <osg/Camera>
#include <osg/Transform>
#include <osg/MatrixTransform>
#include <osg/PositionAttitudeTransform>
#include <osg/CameraView>
#include <osg/LOD>
#include <osgViewer/Viewer>
#include <simgear/constants.h>
#include <simgear/sg_inlines.h>
#include <simgear/debug/logstream.hxx>
#include <simgear/scene/tgdb/userdata.hxx>
#include <simgear/scene/material/matlib.hxx>
#include <simgear/scene/material/mat.hxx>
#include <simgear/scene/util/SGNodeMasks.hxx>
#include <simgear/scene/util/OsgMath.hxx>
#include <simgear/scene/util/SGSceneUserData.hxx>
#include <simgear/scene/model/CheckSceneryVisitor.hxx>
#include <simgear/scene/sky/sky.hxx>
#include <simgear/bvh/BVHNode.hxx>
#include <simgear/bvh/BVHLineSegmentVisitor.hxx>
#include <simgear/structure/commands.hxx>
#include <Viewer/renderer.hxx>
#include <Main/fg_props.hxx>
#include <GUI/MouseCursor.hxx>
#include "tilemgr.hxx"
#include "scenery.hxx"
using namespace flightgear;
using namespace simgear;
class FGGroundPickCallback : public SGPickCallback {
public:
FGGroundPickCallback() : SGPickCallback(PriorityScenery)
{ }
virtual bool buttonPressed( int button,
const osgGA::GUIEventAdapter&,
const Info& info )
{
// only on left mouse button
if (button != 0)
return false;
SGGeod geod = SGGeod::fromCart(info.wgs84);
SG_LOG( SG_TERRAIN, SG_INFO, "Got ground pick at " << geod );
SGPropertyNode *c = fgGetNode("/sim/input/click", true);
c->setDoubleValue("longitude-deg", geod.getLongitudeDeg());
c->setDoubleValue("latitude-deg", geod.getLatitudeDeg());
c->setDoubleValue("elevation-m", geod.getElevationM());
c->setDoubleValue("elevation-ft", geod.getElevationFt());
fgSetBool("/sim/signals/click", 1);
return true;
}
};
class FGSceneryIntersect : public osg::NodeVisitor {
public:
FGSceneryIntersect(const SGLineSegmentd& lineSegment,
const osg::Node* skipNode) :
osg::NodeVisitor(osg::NodeVisitor::TRAVERSE_ACTIVE_CHILDREN),
_lineSegment(lineSegment),
_skipNode(skipNode),
_material(0),
_haveHit(false)
{ }
bool getHaveHit() const
{ return _haveHit; }
const SGLineSegmentd& getLineSegment() const
{ return _lineSegment; }
const simgear::BVHMaterial* getMaterial() const
{ return _material; }
virtual void apply(osg::Node& node)
{
if (&node == _skipNode)
return;
if (!testBoundingSphere(node.getBound()))
return;
addBoundingVolume(node);
}
virtual void apply(osg::Group& group)
{
if (&group == _skipNode)
return;
if (!testBoundingSphere(group.getBound()))
return;
traverse(group);
addBoundingVolume(group);
}
virtual void apply(osg::Transform& transform)
{ handleTransform(transform); }
virtual void apply(osg::Camera& camera)
{
if (camera.getRenderOrder() != osg::Camera::NESTED_RENDER)
return;
handleTransform(camera);
}
virtual void apply(osg::CameraView& transform)
{ handleTransform(transform); }
virtual void apply(osg::MatrixTransform& transform)
{ handleTransform(transform); }
virtual void apply(osg::PositionAttitudeTransform& transform)
{ handleTransform(transform); }
private:
void handleTransform(osg::Transform& transform)
{
if (&transform == _skipNode)
return;
// Hmm, may be this needs to be refined somehow ...
if (transform.getReferenceFrame() != osg::Transform::RELATIVE_RF)
return;
if (!testBoundingSphere(transform.getBound()))
return;
osg::Matrix inverseMatrix;
if (!transform.computeWorldToLocalMatrix(inverseMatrix, this))
return;
osg::Matrix matrix;
if (!transform.computeLocalToWorldMatrix(matrix, this))
return;
SGLineSegmentd lineSegment = _lineSegment;
bool haveHit = _haveHit;
const simgear::BVHMaterial* material = _material;
_haveHit = false;
_lineSegment = lineSegment.transform(SGMatrixd(inverseMatrix.ptr()));
addBoundingVolume(transform);
traverse(transform);
if (_haveHit) {
_lineSegment = _lineSegment.transform(SGMatrixd(matrix.ptr()));
} else {
_lineSegment = lineSegment;
_material = material;
_haveHit = haveHit;
}
}
simgear::BVHNode* getNodeBoundingVolume(osg::Node& node)
{
SGSceneUserData* userData = SGSceneUserData::getSceneUserData(&node);
if (!userData)
return 0;
return userData->getBVHNode();
}
void addBoundingVolume(osg::Node& node)
{
simgear::BVHNode* bvNode = getNodeBoundingVolume(node);
if (!bvNode)
return;
// Find ground intersection on the bvh nodes
simgear::BVHLineSegmentVisitor lineSegmentVisitor(_lineSegment,
0/*startTime*/);
bvNode->accept(lineSegmentVisitor);
if (!lineSegmentVisitor.empty()) {
_lineSegment = lineSegmentVisitor.getLineSegment();
_material = lineSegmentVisitor.getMaterial();
_haveHit = true;
}
}
bool testBoundingSphere(const osg::BoundingSphere& bound) const
{
if (!bound.valid())
return false;
SGSphered sphere(toVec3d(toSG(bound._center)), bound._radius);
return intersects(_lineSegment, sphere);
}
SGLineSegmentd _lineSegment;
const osg::Node* _skipNode;
const simgear::BVHMaterial* _material;
bool _haveHit;
};
class FGScenery::ScenerySwitchListener : public SGPropertyChangeListener
{
public:
ScenerySwitchListener(FGScenery* scenery) :
_scenery(scenery)
{
SGPropertyNode_ptr maskNode = fgGetNode("/sim/rendering/draw-mask", true);
maskNode->getChild("terrain", 0, true)->addChangeListener(this, true);
maskNode->getChild("models", 0, true)->addChangeListener(this, true);
maskNode->getChild("aircraft", 0, true)->addChangeListener(this, true);
maskNode->getChild("clouds", 0, true)->addChangeListener(this, true);
// legacy compatability option
fgGetNode("/sim/rendering/draw-otw")->addChangeListener(this);
// badly named property, this is what is set by --enable/disable-clouds
fgGetNode("/environment/clouds/status")->addChangeListener(this);
}
~ScenerySwitchListener()
{
SGPropertyNode_ptr maskNode = fgGetNode("/sim/rendering/draw-mask");
for (int i=0; i < maskNode->nChildren(); ++i) {
maskNode->getChild(i)->removeChangeListener(this);
}
fgGetNode("/sim/rendering/draw-otw")->removeChangeListener(this);
fgGetNode("/environment/clouds/status")->removeChangeListener(this);
}
virtual void valueChanged (SGPropertyNode * node)
{
bool b = node->getBoolValue();
std::string name(node->getNameString());
if (name == "terrain") {
_scenery->scene_graph->setChildValue(_scenery->terrain_branch, b);
} else if (name == "models") {
_scenery->scene_graph->setChildValue(_scenery->models_branch, b);
} else if (name == "aircraft") {
_scenery->scene_graph->setChildValue(_scenery->aircraft_branch, b);
} else if (name == "clouds") {
// clouds live elsewhere in the scene, but we handle them here
globals->get_renderer()->getSky()->set_clouds_enabled(b);
} else if (name == "draw-otw") {
// legacy setting but let's keep it working
fgGetNode("/sim/rendering/draw-mask")->setBoolValue("terrain", b);
fgGetNode("/sim/rendering/draw-mask")->setBoolValue("models", b);
} else if (name == "status") {
fgGetNode("/sim/rendering/draw-mask")->setBoolValue("clouds", b);
}
}
private:
FGScenery* _scenery;
};
////////////////////////////////////////////////////////////////////////////
// Scenery Management system
FGScenery::FGScenery() :
_listener(NULL)
{
// keep reference to pager singleton, so it cannot be destroyed while FGScenery lives
_pager = FGScenery::getPagerSingleton();
}
FGScenery::~FGScenery()
{
delete _listener;
}
// Initialize the Scenery Management system
void FGScenery::init() {
// Scene graph root
scene_graph = new osg::Switch;
scene_graph->setName( "FGScenery" );
// Terrain branch
terrain_branch = new osg::Group;
terrain_branch->setName( "Terrain" );
scene_graph->addChild( terrain_branch.get() );
SGSceneUserData* userData;
userData = SGSceneUserData::getOrCreateSceneUserData(terrain_branch.get());
userData->setPickCallback(new FGGroundPickCallback);
models_branch = new osg::Group;
models_branch->setName( "Models" );
scene_graph->addChild( models_branch.get() );
aircraft_branch = new osg::Group;
aircraft_branch->setName( "Aircraft" );
scene_graph->addChild( aircraft_branch.get() );
// choosing to make the interior branch a child of the main
// aircraft group, for the moment. This simplifes places which
// assume all aircraft elements are within this group - principally
// FGODGuage::set_aircraft_texture.
interior_branch = new osg::Group;
interior_branch->setName( "Interior" );
osg::LOD* interiorLOD = new osg::LOD;
interiorLOD->addChild(interior_branch.get(), 0.0, 50.0);
aircraft_branch->addChild( interiorLOD );
// Set up the particle system as a directly accessible branch of the scene graph.
particles_branch = simgear::Particles::getCommonRoot();
particles_branch->setName("Particles");
scene_graph->addChild(particles_branch.get());
simgear::GlobalParticleCallback::setSwitch(fgGetNode("/sim/rendering/particles", true));
// Initials values needed by the draw-time object loader
sgUserDataInit( globals->get_props() );
_listener = new ScenerySwitchListener(this);
}
void FGScenery::shutdown()
{
sgUserDataInit( NULL );
scene_graph = NULL;
terrain_branch = NULL;
models_branch = NULL;
aircraft_branch = NULL;
particles_branch = NULL;
}
void FGScenery::update(double dt)
{
SG_UNUSED(dt);
// nothing here, don't call again
suspend();
}
void FGScenery::bind() {
}
void FGScenery::unbind() {
}
bool
FGScenery::get_cart_elevation_m(const SGVec3d& pos, double max_altoff,
double& alt,
const simgear::BVHMaterial** material,
const osg::Node* butNotFrom)
{
SGGeod geod = SGGeod::fromCart(pos);
geod.setElevationM(geod.getElevationM() + max_altoff);
return get_elevation_m(geod, alt, material, butNotFrom);
}
bool
FGScenery::get_elevation_m(const SGGeod& geod, double& alt,
const simgear::BVHMaterial** material,
const osg::Node* butNotFrom)
{
SGVec3d start = SGVec3d::fromGeod(geod);
SGGeod geodEnd = geod;
geodEnd.setElevationM(SGMiscd::min(geod.getElevationM() - 10, -10000));
SGVec3d end = SGVec3d::fromGeod(geodEnd);
FGSceneryIntersect intersectVisitor(SGLineSegmentd(start, end), butNotFrom);
intersectVisitor.setTraversalMask(SG_NODEMASK_TERRAIN_BIT);
get_scene_graph()->accept(intersectVisitor);
if (!intersectVisitor.getHaveHit())
return false;
geodEnd = SGGeod::fromCart(intersectVisitor.getLineSegment().getEnd());
alt = geodEnd.getElevationM();
if (material)
*material = intersectVisitor.getMaterial();
return true;
}
bool
FGScenery::get_cart_ground_intersection(const SGVec3d& pos, const SGVec3d& dir,
SGVec3d& nearestHit,
const osg::Node* butNotFrom)
{
// We assume that starting positions in the center of the earth are invalid
if ( norm1(pos) < 1 )
return false;
// Make really sure the direction is normalized, is really cheap compared to
// computation of ground intersection.
SGVec3d start = pos;
SGVec3d end = start + 1e5*normalize(dir); // FIXME visibility ???
FGSceneryIntersect intersectVisitor(SGLineSegmentd(start, end), butNotFrom);
intersectVisitor.setTraversalMask(SG_NODEMASK_TERRAIN_BIT);
get_scene_graph()->accept(intersectVisitor);
if (!intersectVisitor.getHaveHit())
return false;
nearestHit = intersectVisitor.getLineSegment().getEnd();
return true;
}
bool FGScenery::scenery_available(const SGGeod& position, double range_m)
{
if(globals->get_tile_mgr()->schedule_scenery(position, range_m, 0.0))
{
double elev;
if (!get_elevation_m(SGGeod::fromGeodM(position, SG_MAX_ELEVATION_M), elev, 0, 0))
return false;
SGVec3f p = SGVec3f::fromGeod(SGGeod::fromGeodM(position, elev));
osg::FrameStamp* framestamp
= globals->get_renderer()->getViewer()->getFrameStamp();
simgear::CheckSceneryVisitor csnv(_pager, toOsg(p), range_m, framestamp);
// currently the PagedLODs will not be loaded by the DatabasePager
// while the splashscreen is there, so CheckSceneryVisitor force-loads
// missing objects in the main thread
get_scene_graph()->accept(csnv);
if(!csnv.isLoaded()) {
SG_LOG(SG_TERRAIN, SG_DEBUG, "FGScenery::scenery_available: waiting on CheckSceneryVisitor");
return false;
}
return true;
} else {
SG_LOG(SG_TERRAIN, SG_DEBUG, "FGScenery::scenery_available: waiting on tile manager");
}
return false;
}
static osg::ref_ptr<SceneryPager> pager;
SceneryPager* FGScenery::getPagerSingleton()
{
if (!pager)
pager = new SceneryPager;
return pager.get();
}
void FGScenery::resetPagerSingleton()
{
pager = NULL;
}
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