src/Instrumentation/groundradar.cxx

   1 //  groundradar.cxx - Background layer for the ATC radar.
   2 //
   3 //  Copyright (C) 2007 Csaba Halasz.
   4 //
   5 //  This program is free software; you can redistribute it and/or
   6 //  modify it under the terms of the GNU General Public License as
   7 //  published by the Free Software Foundation; either version 2 of the
   8 //  License, or (at your option) any later version.
   9 //
  10 //  This program is distributed in the hope that it will be useful, but
  11 //  WITHOUT ANY WARRANTY; without even the implied warranty of
  12 //  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13 //  General Public License for more details.
  14 //
  15 //  You should have received a copy of the GNU General Public License
  16 //  along with this program; if not, write to the Free Software
  17 //  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
  18
  19 #ifdef HAVE_CONFIG_H
  20 #  include "config.h"
  21 #endif
  22
  23 #include <osg/Node>
  24 #include <osg/Geode>
  25 #include <osg/Geometry>
  26 #include <osg/Camera>
  27 #include <osg/Texture2D>
  28 #include <osgViewer/Viewer>
  29
  30 #include <osgText/Text>
  31 #include <osgDB/Registry>
  32 #include <osgDB/ReaderWriter>
  33 #include <osgUtil/Tessellator>
  34
  35 #include <Main/fg_props.hxx>
  36 #include <Main/globals.hxx>
  37 #include <Main/renderer.hxx>
  38 #include <Cockpit/panel.hxx>
  39 #include <Airports/simple.hxx>
  40 #include <Airports/runways.hxx>
  41 #include <Airports/pavement.hxx>
  42 #include <simgear/math/sg_geodesy.hxx>
  43 #include <simgear/math/beziercurve.hxx>
  44
  45 #include "groundradar.hxx"
  46
  47 static const char* airport_source_node_name = "airport-id-source";
  48 static const char* default_airport_node_name = "/sim/tower/airport-id";
  49 static const char* texture_node_name = "texture-name";
  50 static const char* default_texture_name = "Aircraft/Instruments/Textures/od_groundradar.rgb";
  51 static const char* range_source_node_name = "range-source";
  52 static const char* default_range_node_name = "/instrumentation/radar/range";
  53
  54 struct SingleFrameCallback : public osg::Camera::DrawCallback
  55 {
  56     virtual void operator () (const osg::Camera& camera) const
  57     {
  58         const_cast<osg::Camera&>(camera).setNodeMask(0);
  59     }
  60 };
  61
  62 GroundRadar::GroundRadar(SGPropertyNode *node)
  63 {
  64     _airport_node = fgGetNode(node->getStringValue(airport_source_node_name, default_airport_node_name), true);
  65     _range_node = fgGetNode(node->getStringValue(range_source_node_name, default_range_node_name), true);
  66     createTexture(node->getStringValue(texture_node_name, default_texture_name));
  67     updateTexture();
  68     _airport_node->addChangeListener(this);
  69     _range_node->addChangeListener(this);
  70 }
  71
  72 GroundRadar::~GroundRadar()
  73 {
  74     _airport_node->removeChangeListener(this);
  75     _range_node->removeChangeListener(this);
  76 }
  77
  78 void GroundRadar::valueChanged(SGPropertyNode*)
  79 {
  80     updateTexture();
  81 }
  82
  83 inline static osg::Vec3 fromPolar(double fi, double r)
  84 {
  85     return osg::Vec3(sin(fi * SGD_DEGREES_TO_RADIANS) * r, cos(fi * SGD_DEGREES_TO_RADIANS) * r, 0);
  86 }
  87
  88 void GroundRadar::createTexture(const char* texture_name)
  89 {
  90     setSize(TextureHalfSize + TextureHalfSize);
  91     allocRT();
  92
  93     _geode = new osg::Geode();
  94     osg::StateSet* stateset = _geode->getOrCreateStateSet();
  95     stateset->setMode(GL_BLEND, osg::StateAttribute::OFF);
  96
  97     osg::Vec4Array* taxi_color = new osg::Vec4Array;
  98     taxi_color->push_back(osg::Vec4(0.0f, 0.5f, 0.0f, 1.0f));
  99     osg::Vec4Array* rwy_color = new osg::Vec4Array;
 100     rwy_color->push_back(osg::Vec4(0.0f, 0.5f, 0.5f, 1.0f));
 101
 102     osg::Geometry *taxi_geom = new osg::Geometry();
 103     taxi_geom->setColorArray(taxi_color);
 104     taxi_geom->setColorBinding(osg::Geometry::BIND_OVERALL);
 105     taxi_geom->addPrimitiveSet(new osg::DrawArrays(osg::PrimitiveSet::QUADS, 0, 0)); // Taxiways
 106     _geode->addDrawable(taxi_geom);
 107
 108     osg::Geometry *pvt_geom = new osg::Geometry();
 109     pvt_geom->setColorArray(taxi_color);
 110     pvt_geom->setColorBinding(osg::Geometry::BIND_OVERALL);
 111     // no primitive set for the moment. It needs tessellation
 112     _geode->addDrawable(pvt_geom);
 113
 114     osg::Geometry *rwy_geom = new osg::Geometry();
 115     rwy_geom->setColorArray(rwy_color);
 116     rwy_geom->setColorBinding(osg::Geometry::BIND_OVERALL);
 117     rwy_geom->addPrimitiveSet(new osg::DrawArrays(osg::PrimitiveSet::QUADS, 0, 0)); // Runways
 118     _geode->addDrawable(rwy_geom);
 119
 120     osg::Camera* camera = getCamera();
 121     camera->setPostDrawCallback(new SingleFrameCallback());
 122     camera->addChild(_geode.get());
 123     camera->setNodeMask(0);
 124     camera->setProjectionMatrixAsOrtho2D(0, getTexture()->getTextureWidth(), 0, getTexture()->getTextureHeight());
 125
 126     // Texture in the 2D panel system
 127     FGTextureManager::addTexture(texture_name, getTexture());
 128 }
 129
 130 void GroundRadar::addRunwayVertices(const FGRunwayBase* aRunway, double aTowerLat, double aTowerLon, double aScale, osg::Vec3Array* aVertices)
 131 {
 132   double az1, az2, dist_m;
 133   geo_inverse_wgs_84(aTowerLat, aTowerLon, aRunway->latitude(), aRunway->longitude(), &az1, &az2, &dist_m);
 134
 135   osg::Vec3 center = fromPolar(az1, dist_m * aScale) + osg::Vec3(TextureHalfSize, TextureHalfSize, 0);
 136   osg::Vec3 leftcenter = fromPolar(aRunway->headingDeg(), aRunway->lengthM() * aScale / 2) + center;
 137   osg::Vec3 lefttop = fromPolar(aRunway->headingDeg() - 90, aRunway->widthM() * aScale / 2) + leftcenter;
 138   osg::Vec3 leftbottom = leftcenter * 2 - lefttop;
 139   osg::Vec3 rightbottom = center * 2 - lefttop;
 140   osg::Vec3 righttop = center * 2 - leftbottom;
 141
 142   aVertices->push_back(lefttop);
 143   aVertices->push_back(leftbottom);
 144   aVertices->push_back(rightbottom);
 145   aVertices->push_back(righttop);
 146 }
 147
 148 osg::Geometry *GroundRadar::addPavementGeometry(const FGPavement* aPavement, double aTowerLat, double aTowerLon, double aScale)
 149 {
 150
 151   osg::ref_ptr<osgUtil::Tessellator> tess = new osgUtil::Tessellator;
 152   osg::ref_ptr<osg::Geometry> polygon = new osg::Geometry;
 153   osg::ref_ptr<osg::Vec3Array> pts = new osg::Vec3Array;
 154
 155   double az1, az2, dist_m;
 156   const FGPavement::NodeList &nodeLst = aPavement->getNodeList();
 157   FGPavement::NodeList::const_iterator it = nodeLst.begin(),
 158                                         loopBegin = it;
 159   while ( it != nodeLst.end() )
 160   {
 161     bool close = (*it)->mClose;
 162     geo_inverse_wgs_84(aTowerLat, aTowerLon, (*it)->mPos.getLatitudeDeg(), (*it)->mPos.getLongitudeDeg(), &az1, &az2, &dist_m);
 163     osg::Vec3 p1 = fromPolar(az1, dist_m * aScale) + osg::Vec3(TextureHalfSize, TextureHalfSize, 0);
 164     const FGPavement::BezierNode *bn = dynamic_cast<const FGPavement::BezierNode *>( it->ptr() );
 165     if ( bn != 0 )
 166     {
 167       geo_inverse_wgs_84(aTowerLat, aTowerLon, bn->mControl.getLatitudeDeg(), bn->mControl.getLongitudeDeg(), &az1, &az2, &dist_m);
 168       osg::Vec3 p2 = fromPolar(az1, dist_m * aScale) + osg::Vec3(TextureHalfSize, TextureHalfSize, 0),
 169                 p3;
 170       ++it;
 171       if ( it == nodeLst.end() || close )
 172       {
 173         geo_inverse_wgs_84(aTowerLat, aTowerLon, (*loopBegin)->mPos.getLatitudeDeg(), (*loopBegin)->mPos.getLongitudeDeg(), &az1, &az2, &dist_m);
 174       }
 175       else
 176       {
 177         geo_inverse_wgs_84(aTowerLat, aTowerLon, (*it)->mPos.getLatitudeDeg(), (*it)->mPos.getLongitudeDeg(), &az1, &az2, &dist_m);
 178       }
 179       p3 = fromPolar(az1, dist_m * aScale) + osg::Vec3(TextureHalfSize, TextureHalfSize, 0);
 180       simgear::BezierCurve<osg::Vec3> bCurv( p1, p2, p3 );
 181       simgear::BezierCurve<osg::Vec3>::PointList &ptList = bCurv.pointList();
 182       for ( simgear::BezierCurve<osg::Vec3>::PointList::iterator ii = ptList.begin(); ii != ptList.end(); ++ii )
 183       {
 184         pts->push_back( *ii );
 185       }
 186       pts->pop_back(); // Last point belongs to next segment
 187     }
 188     else
 189     {
 190       pts->push_back( p1 );
 191       ++it;
 192     }
 193
 194     if ( close ) // One loop for the moment
 195       break;
 196   }
 197   geo_inverse_wgs_84(aTowerLat, aTowerLon, (*loopBegin)->mPos.getLatitudeDeg(), (*loopBegin)->mPos.getLongitudeDeg(), &az1, &az2, &dist_m);
 198   osg::Vec3 p1 = fromPolar(az1, dist_m * aScale) + osg::Vec3(TextureHalfSize, TextureHalfSize, 0);
 199   pts->push_back( p1 );
 200   polygon->setVertexArray( pts.get() );
 201
 202   polygon->addPrimitiveSet( new osg::DrawArrays( osg::PrimitiveSet::POLYGON, 0, pts->size() ) );
 203
 204   tess->setTessellationType( osgUtil::Tessellator::TESS_TYPE_GEOMETRY );
 205   tess->setBoundaryOnly( false );
 206   tess->setWindingType( osgUtil::Tessellator::TESS_WINDING_ODD );
 207   tess->retessellatePolygons( *polygon );
 208   return polygon.release();
 209 }
 210
 211 void GroundRadar::updateTexture()
 212 {
 213     osg::ref_ptr<osg::Vec3Array> rwy_vertices = new osg::Vec3Array;
 214     osg::ref_ptr<osg::Vec3Array> taxi_vertices = new osg::Vec3Array;
 215     osg::ref_ptr<osg::Vec3Array> pvt_vertices = new osg::Vec3Array;
 216
 217     const string airport_name = _airport_node->getStringValue();
 218
 219     const FGAirport* airport = fgFindAirportID(airport_name);
 220     if (airport == 0)
 221         return;
 222
 223     const SGGeod& tower_location = airport->getTowerLocation();
 224     const double tower_lat = tower_location.getLatitudeDeg();
 225     const double tower_lon = tower_location.getLongitudeDeg();
 226     double scale = SG_METER_TO_NM * 200 / _range_node->getDoubleValue();
 227
 228     const FGAirport* apt = fgFindAirportID(airport_name);
 229     assert(apt);
 230
 231     for (unsigned int i=0; i<apt->numTaxiways(); ++i)
 232     {
 233       FGTaxiway* txwy(apt->getTaxiwayByIndex(i));
 234       addRunwayVertices(txwy, tower_lat, tower_lon, scale, taxi_vertices.get());
 235     }
 236     osg::Geometry *taxi_geom = dynamic_cast<osg::Geometry *>(_geode->getDrawable(0));
 237     taxi_geom->setVertexArray(taxi_vertices.get());
 238     osg::DrawArrays* taxi = dynamic_cast<osg::DrawArrays*>(taxi_geom->getPrimitiveSet(0));
 239     taxi->setCount(taxi_vertices->size());
 240
 241     osg::Geometry *pvt_geom = dynamic_cast<osg::Geometry *>(_geode->getDrawable(1));
 242     osg::Geometry::PrimitiveSetList &pvt_prim_list = pvt_geom->getPrimitiveSetList();
 243     pvt_prim_list.clear();
 244     for (unsigned int i=0; i<apt->numPavements(); ++i)
 245     {
 246       FGPavement* pvt(apt->getPavementByIndex(i));
 247       osg::ref_ptr<osg::Geometry> geom = addPavementGeometry(pvt, tower_lat, tower_lon, scale);
 248       osg::Geometry::PrimitiveSetList &prim_list = geom->getPrimitiveSetList();
 249       osg::Vec3Array *vertices = dynamic_cast<osg::Vec3Array *>(geom->getVertexArray());
 250       size_t before = pvt_vertices->size(),
 251             count = vertices->size();
 252       for (size_t i = 0; i < count; ++i )
 253       {
 254         pvt_vertices->push_back( (*vertices)[i] );
 255       }
 256       for (osg::Geometry::PrimitiveSetList::iterator ii = prim_list.begin(); ii != prim_list.end(); ++ii )
 257       {
 258         osg::DrawArrays *da;
 259         osg::DrawElementsUByte *de1;
 260         osg::DrawElementsUShort *de2;
 261         osg::DrawElementsUInt *de3;
 262         if ((da = dynamic_cast<osg::DrawArrays *>(ii->get())) != 0)
 263         {
 264           osg::DrawArrays *ps = new osg::DrawArrays(*da);
 265           ps->setFirst(da->getFirst() + before);
 266           pvt_prim_list.push_back(ps);
 267         }
 268         else if ((de1 = dynamic_cast<osg::DrawElementsUByte *>(ii->get())) != 0)
 269         {
 270           if (before + count <= 255)
 271           {
 272             osg::DrawElementsUByte *ps = new osg::DrawElementsUByte(*de1);
 273             for (size_t j = 0; j < ps->size(); ++j)
 274             {
 275               (*ps)[j] += before;
 276             }
 277             pvt_prim_list.push_back(ps);
 278           }
 279           else if (before + count <= 65535)
 280           {
 281             osg::DrawElementsUShort *ps = new osg::DrawElementsUShort(de1->getMode(), de1->begin(), de1->end());
 282             for (size_t j = 0; j < ps->size(); ++j)
 283             {
 284               (*ps)[j] += before;
 285             }
 286             pvt_prim_list.push_back(ps);
 287           }
 288           else
 289           {
 290             osg::DrawElementsUInt *ps = new osg::DrawElementsUInt(de1->getMode(), de1->begin(), de1->end());
 291             for (size_t j = 0; j < ps->size(); ++j)
 292             {
 293               (*ps)[j] += before;
 294             }
 295             pvt_prim_list.push_back(ps);
 296           }
 297         }
 298         else if ((de2 = dynamic_cast<osg::DrawElementsUShort *>(ii->get())) != 0)
 299         {
 300           if (before + count <= 65535)
 301           {
 302             osg::DrawElementsUShort *ps = new osg::DrawElementsUShort(*de2);
 303             for (size_t j = 0; j < ps->size(); ++j)
 304             {
 305               (*ps)[j] += before;
 306             }
 307             pvt_prim_list.push_back(ps);
 308           }
 309           else
 310           {
 311             osg::DrawElementsUInt *ps = new osg::DrawElementsUInt(de2->getMode(), de2->begin(), de2->end());
 312             for (size_t j = 0; j < ps->size(); ++j)
 313             {
 314               (*ps)[j] += before;
 315             }
 316             pvt_prim_list.push_back(ps);
 317           }
 318         }
 319         else if ((de3 = dynamic_cast<osg::DrawElementsUInt *>(ii->get())) != 0)
 320         {
 321           osg::DrawElementsUInt *ps = new osg::DrawElementsUInt(*de3);
 322           for (size_t j = 0; j < ps->size(); ++j)
 323           {
 324             (*ps)[j] += before;
 325           }
 326           pvt_prim_list.push_back(ps);
 327         }
 328       }
 329     }
 330     pvt_geom->setVertexArray(pvt_vertices.get());
 331
 332     for (unsigned int i=0; i<apt->numRunways(); ++i)
 333     {
 334       FGRunway* runway(apt->getRunwayByIndex(i));
 335       if (runway->isReciprocal()) continue;
 336
 337       addRunwayVertices(runway, tower_lat, tower_lon, scale, rwy_vertices.get());
 338     }
 339     osg::Geometry *rwy_geom = dynamic_cast<osg::Geometry *>(_geode->getDrawable(2));
 340     rwy_geom->setVertexArray(rwy_vertices.get());
 341     osg::DrawArrays* rwy = dynamic_cast<osg::DrawArrays*>(rwy_geom->getPrimitiveSet(0));
 342     rwy->setCount(rwy_vertices->size());
 343
 344     getCamera()->setNodeMask(0xffffffff);
 345 }
 346
 347 // end of GroundRadar.cxx