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 <cassert>
  24
  25 #include <osg/Node>
  26 #include <osg/Geode>
  27 #include <osg/Geometry>
  28 #include <osg/Camera>
  29 #include <osg/Texture2D>
  30 #include <osgViewer/Viewer>
  31
  32 #include <osgText/Text>
  33 #include <osgDB/Registry>
  34 #include <osgDB/ReaderWriter>
  35 #include <osgUtil/Tessellator>
  36
  37 #include <Main/fg_props.hxx>
  38 #include <Main/globals.hxx>
  39 #include <Main/renderer.hxx>
  40 #include <Cockpit/panel.hxx>
  41 #include <Airports/simple.hxx>
  42 #include <Airports/runways.hxx>
  43 #include <Airports/pavement.hxx>
  44 #include <simgear/math/sg_geodesy.hxx>
  45 #include <simgear/math/beziercurve.hxx>
  46
  47 #include "groundradar.hxx"
  48
  49 static const char* airport_source_node_name = "airport-id-source";
  50 static const char* default_airport_node_name = "/sim/airport/closest-airport-id";
  51 static const char* texture_node_name = "texture-name";
  52 static const char* default_texture_name = "Aircraft/Instruments/Textures/od_groundradar.rgb";
  53 static const char* range_source_node_name = "range-source";
  54 static const char* default_range_node_name = "/instrumentation/radar/range";
  55
  56 struct SingleFrameCallback : public osg::Camera::DrawCallback
  57 {
  58     virtual void operator () (const osg::Camera& camera) const
  59     {
  60         const_cast<osg::Camera&>(camera).setNodeMask(0);
  61     }
  62 };
  63
  64 GroundRadar::GroundRadar(SGPropertyNode *node)
  65 {
  66     _airport_node = fgGetNode(node->getStringValue(airport_source_node_name, default_airport_node_name), true);
  67     _range_node = fgGetNode(node->getStringValue(range_source_node_name, default_range_node_name), true);
  68     createTexture(node->getStringValue(texture_node_name, default_texture_name));
  69     updateTexture();
  70     _airport_node->addChangeListener(this);
  71     _range_node->addChangeListener(this);
  72 }
  73
  74 GroundRadar::~GroundRadar()
  75 {
  76     _airport_node->removeChangeListener(this);
  77     _range_node->removeChangeListener(this);
  78 }
  79
  80 void GroundRadar::valueChanged(SGPropertyNode*)
  81 {
  82     updateTexture();
  83 }
  84
  85 inline static osg::Vec3 fromPolar(double fi, double r)
  86 {
  87     return osg::Vec3(sin(fi * SGD_DEGREES_TO_RADIANS) * r, cos(fi * SGD_DEGREES_TO_RADIANS) * r, 0);
  88 }
  89
  90 void GroundRadar::createTexture(const char* texture_name)
  91 {
  92     setSize(TextureHalfSize + TextureHalfSize);
  93     allocRT();
  94
  95     _geode = new osg::Geode();
  96     osg::StateSet* stateset = _geode->getOrCreateStateSet();
  97     stateset->setMode(GL_BLEND, osg::StateAttribute::OFF);
  98
  99     osg::Vec4Array* taxi_color = new osg::Vec4Array;
 100     taxi_color->push_back(osg::Vec4(0.0f, 0.5f, 0.0f, 1.0f));
 101     osg::Vec4Array* rwy_color = new osg::Vec4Array;
 102     rwy_color->push_back(osg::Vec4(0.0f, 0.5f, 0.5f, 1.0f));
 103
 104     osg::Geometry *taxi_geom = new osg::Geometry();
 105     taxi_geom->setColorArray(taxi_color);
 106     taxi_geom->setColorBinding(osg::Geometry::BIND_OVERALL);
 107     taxi_geom->addPrimitiveSet(new osg::DrawArrays(osg::PrimitiveSet::QUADS, 0, 0)); // Taxiways
 108     _geode->addDrawable(taxi_geom);
 109
 110     osg::Geometry *pvt_geom = new osg::Geometry();
 111     pvt_geom->setColorArray(taxi_color);
 112     pvt_geom->setColorBinding(osg::Geometry::BIND_OVERALL);
 113     // no primitive set for the moment. It needs tessellation
 114     _geode->addDrawable(pvt_geom);
 115
 116     osg::Geometry *rwy_geom = new osg::Geometry();
 117     rwy_geom->setColorArray(rwy_color);
 118     rwy_geom->setColorBinding(osg::Geometry::BIND_OVERALL);
 119     rwy_geom->addPrimitiveSet(new osg::DrawArrays(osg::PrimitiveSet::QUADS, 0, 0)); // Runways
 120     _geode->addDrawable(rwy_geom);
 121
 122     osg::Camera* camera = getCamera();
 123     camera->setPostDrawCallback(new SingleFrameCallback());
 124     camera->addChild(_geode.get());
 125     camera->setNodeMask(0);
 126     camera->setProjectionMatrixAsOrtho2D(0, getTexture()->getTextureWidth(), 0, getTexture()->getTextureHeight());
 127
 128     // Texture in the 2D panel system
 129     FGTextureManager::addTexture(texture_name, getTexture());
 130 }
 131
 132 void GroundRadar::addRunwayVertices(const FGRunwayBase* aRunway, double aTowerLat, double aTowerLon, double aScale, osg::Vec3Array* aVertices)
 133 {
 134   double az1, az2, dist_m;
 135   geo_inverse_wgs_84(aTowerLat, aTowerLon, aRunway->latitude(), aRunway->longitude(), &az1, &az2, &dist_m);
 136
 137   osg::Vec3 center = fromPolar(az1, dist_m * aScale) + osg::Vec3(TextureHalfSize, TextureHalfSize, 0);
 138   osg::Vec3 leftcenter = fromPolar(aRunway->headingDeg(), aRunway->lengthM() * aScale / 2) + center;
 139   osg::Vec3 lefttop = fromPolar(aRunway->headingDeg() - 90, aRunway->widthM() * aScale / 2) + leftcenter;
 140   osg::Vec3 leftbottom = leftcenter * 2 - lefttop;
 141   osg::Vec3 rightbottom = center * 2 - lefttop;
 142   osg::Vec3 righttop = center * 2 - leftbottom;
 143
 144   aVertices->push_back(lefttop);
 145   aVertices->push_back(leftbottom);
 146   aVertices->push_back(rightbottom);
 147   aVertices->push_back(righttop);
 148 }
 149
 150 osg::Geometry *GroundRadar::addPavementGeometry(const FGPavement* aPavement, double aTowerLat, double aTowerLon, double aScale)
 151 {
 152
 153   osg::ref_ptr<osgUtil::Tessellator> tess = new osgUtil::Tessellator;
 154   osg::ref_ptr<osg::Geometry> polygon = new osg::Geometry;
 155   osg::ref_ptr<osg::Vec3Array> pts = new osg::Vec3Array;
 156
 157   double az1, az2, dist_m;
 158   const FGPavement::NodeList &nodeLst = aPavement->getNodeList();
 159   FGPavement::NodeList::const_iterator it = nodeLst.begin(),
 160                                         loopBegin = it;
 161   while ( it != nodeLst.end() )
 162   {
 163     bool close = (*it)->mClose;
 164     geo_inverse_wgs_84(aTowerLat, aTowerLon, (*it)->mPos.getLatitudeDeg(), (*it)->mPos.getLongitudeDeg(), &az1, &az2, &dist_m);
 165     osg::Vec3 p1 = fromPolar(az1, dist_m * aScale) + osg::Vec3(TextureHalfSize, TextureHalfSize, 0);
 166     const FGPavement::BezierNode *bn = dynamic_cast<const FGPavement::BezierNode *>( it->ptr() );
 167     if ( bn != 0 )
 168     {
 169       geo_inverse_wgs_84(aTowerLat, aTowerLon, bn->mControl.getLatitudeDeg(), bn->mControl.getLongitudeDeg(), &az1, &az2, &dist_m);
 170       osg::Vec3 p2 = fromPolar(az1, dist_m * aScale) + osg::Vec3(TextureHalfSize, TextureHalfSize, 0),
 171                 p3;
 172       ++it;
 173       if ( it == nodeLst.end() || close )
 174       {
 175         geo_inverse_wgs_84(aTowerLat, aTowerLon, (*loopBegin)->mPos.getLatitudeDeg(), (*loopBegin)->mPos.getLongitudeDeg(), &az1, &az2, &dist_m);
 176       }
 177       else
 178       {
 179         geo_inverse_wgs_84(aTowerLat, aTowerLon, (*it)->mPos.getLatitudeDeg(), (*it)->mPos.getLongitudeDeg(), &az1, &az2, &dist_m);
 180       }
 181       p3 = fromPolar(az1, dist_m * aScale) + osg::Vec3(TextureHalfSize, TextureHalfSize, 0);
 182       simgear::BezierCurve<osg::Vec3> bCurv( p1, p2, p3 );
 183       simgear::BezierCurve<osg::Vec3>::PointList &ptList = bCurv.pointList();
 184       for ( simgear::BezierCurve<osg::Vec3>::PointList::iterator ii = ptList.begin(); ii != ptList.end(); ++ii )
 185       {
 186         pts->push_back( *ii );
 187       }
 188       pts->pop_back(); // Last point belongs to next segment
 189     }
 190     else
 191     {
 192       pts->push_back( p1 );
 193       ++it;
 194     }
 195
 196     if ( close ) // One loop for the moment
 197       break;
 198   }
 199   geo_inverse_wgs_84(aTowerLat, aTowerLon, (*loopBegin)->mPos.getLatitudeDeg(), (*loopBegin)->mPos.getLongitudeDeg(), &az1, &az2, &dist_m);
 200   osg::Vec3 p1 = fromPolar(az1, dist_m * aScale) + osg::Vec3(TextureHalfSize, TextureHalfSize, 0);
 201   pts->push_back( p1 );
 202   polygon->setVertexArray( pts.get() );
 203
 204   polygon->addPrimitiveSet( new osg::DrawArrays( osg::PrimitiveSet::POLYGON, 0, pts->size() ) );
 205
 206   tess->setTessellationType( osgUtil::Tessellator::TESS_TYPE_GEOMETRY );
 207   tess->setBoundaryOnly( false );
 208   tess->setWindingType( osgUtil::Tessellator::TESS_WINDING_ODD );
 209   tess->retessellatePolygons( *polygon );
 210   return polygon.release();
 211 }
 212
 213 void GroundRadar::updateTexture()
 214 {
 215     osg::ref_ptr<osg::Vec3Array> rwy_vertices = new osg::Vec3Array;
 216     osg::ref_ptr<osg::Vec3Array> taxi_vertices = new osg::Vec3Array;
 217     osg::ref_ptr<osg::Vec3Array> pvt_vertices = new osg::Vec3Array;
 218
 219     const string airport_name = _airport_node->getStringValue();
 220
 221     const FGAirport* airport = fgFindAirportID(airport_name);
 222     if (airport == 0)
 223         return;
 224
 225     const SGGeod& tower_location = airport->getTowerLocation();
 226     const double tower_lat = tower_location.getLatitudeDeg();
 227     const double tower_lon = tower_location.getLongitudeDeg();
 228     double scale = SG_METER_TO_NM * 200 / _range_node->getDoubleValue();
 229
 230     const FGAirport* apt = fgFindAirportID(airport_name);
 231     assert(apt);
 232
 233     for (unsigned int i=0; i<apt->numTaxiways(); ++i)
 234     {
 235       FGTaxiway* txwy(apt->getTaxiwayByIndex(i));
 236       addRunwayVertices(txwy, tower_lat, tower_lon, scale, taxi_vertices.get());
 237     }
 238     osg::Geometry *taxi_geom = dynamic_cast<osg::Geometry *>(_geode->getDrawable(0));
 239     taxi_geom->setVertexArray(taxi_vertices.get());
 240     osg::DrawArrays* taxi = dynamic_cast<osg::DrawArrays*>(taxi_geom->getPrimitiveSet(0));
 241     taxi->setCount(taxi_vertices->size());
 242
 243     osg::Geometry *pvt_geom = dynamic_cast<osg::Geometry *>(_geode->getDrawable(1));
 244     osg::Geometry::PrimitiveSetList &pvt_prim_list = pvt_geom->getPrimitiveSetList();
 245     pvt_prim_list.clear();
 246     for (unsigned int i=0; i<apt->numPavements(); ++i)
 247     {
 248       FGPavement* pvt(apt->getPavementByIndex(i));
 249       osg::ref_ptr<osg::Geometry> geom = addPavementGeometry(pvt, tower_lat, tower_lon, scale);
 250       osg::Geometry::PrimitiveSetList &prim_list = geom->getPrimitiveSetList();
 251       osg::Vec3Array *vertices = dynamic_cast<osg::Vec3Array *>(geom->getVertexArray());
 252       size_t before = pvt_vertices->size(),
 253             count = vertices->size();
 254       for (size_t i = 0; i < count; ++i )
 255       {
 256         pvt_vertices->push_back( (*vertices)[i] );
 257       }
 258       for (osg::Geometry::PrimitiveSetList::iterator ii = prim_list.begin(); ii != prim_list.end(); ++ii )
 259       {
 260         osg::DrawArrays *da;
 261         osg::DrawElementsUByte *de1;
 262         osg::DrawElementsUShort *de2;
 263         osg::DrawElementsUInt *de3;
 264         if ((da = dynamic_cast<osg::DrawArrays *>(ii->get())) != 0)
 265         {
 266           osg::DrawArrays *ps = new osg::DrawArrays(*da);
 267           ps->setFirst(da->getFirst() + before);
 268           pvt_prim_list.push_back(ps);
 269         }
 270         else if ((de1 = dynamic_cast<osg::DrawElementsUByte *>(ii->get())) != 0)
 271         {
 272           if (before + count <= 255)
 273           {
 274             osg::DrawElementsUByte *ps = new osg::DrawElementsUByte(*de1);
 275             for (size_t j = 0; j < ps->size(); ++j)
 276             {
 277               (*ps)[j] += before;
 278             }
 279             pvt_prim_list.push_back(ps);
 280           }
 281           else if (before + count <= 65535)
 282           {
 283             osg::DrawElementsUShort *ps = new osg::DrawElementsUShort(de1->getMode(), de1->begin(), de1->end());
 284             for (size_t j = 0; j < ps->size(); ++j)
 285             {
 286               (*ps)[j] += before;
 287             }
 288             pvt_prim_list.push_back(ps);
 289           }
 290           else
 291           {
 292             osg::DrawElementsUInt *ps = new osg::DrawElementsUInt(de1->getMode(), de1->begin(), de1->end());
 293             for (size_t j = 0; j < ps->size(); ++j)
 294             {
 295               (*ps)[j] += before;
 296             }
 297             pvt_prim_list.push_back(ps);
 298           }
 299         }
 300         else if ((de2 = dynamic_cast<osg::DrawElementsUShort *>(ii->get())) != 0)
 301         {
 302           if (before + count <= 65535)
 303           {
 304             osg::DrawElementsUShort *ps = new osg::DrawElementsUShort(*de2);
 305             for (size_t j = 0; j < ps->size(); ++j)
 306             {
 307               (*ps)[j] += before;
 308             }
 309             pvt_prim_list.push_back(ps);
 310           }
 311           else
 312           {
 313             osg::DrawElementsUInt *ps = new osg::DrawElementsUInt(de2->getMode(), de2->begin(), de2->end());
 314             for (size_t j = 0; j < ps->size(); ++j)
 315             {
 316               (*ps)[j] += before;
 317             }
 318             pvt_prim_list.push_back(ps);
 319           }
 320         }
 321         else if ((de3 = dynamic_cast<osg::DrawElementsUInt *>(ii->get())) != 0)
 322         {
 323           osg::DrawElementsUInt *ps = new osg::DrawElementsUInt(*de3);
 324           for (size_t j = 0; j < ps->size(); ++j)
 325           {
 326             (*ps)[j] += before;
 327           }
 328           pvt_prim_list.push_back(ps);
 329         }
 330       }
 331     }
 332     pvt_geom->setVertexArray(pvt_vertices.get());
 333
 334     for (unsigned int i=0; i<apt->numRunways(); ++i)
 335     {
 336       FGRunway* runway(apt->getRunwayByIndex(i));
 337       if (runway->isReciprocal()) continue;
 338
 339       addRunwayVertices(runway, tower_lat, tower_lon, scale, rwy_vertices.get());
 340     }
 341     osg::Geometry *rwy_geom = dynamic_cast<osg::Geometry *>(_geode->getDrawable(2));
 342     rwy_geom->setVertexArray(rwy_vertices.get());
 343     osg::DrawArrays* rwy = dynamic_cast<osg::DrawArrays*>(rwy_geom->getPrimitiveSet(0));
 344     rwy->setCount(rwy_vertices->size());
 345
 346     getCamera()->setNodeMask(0xffffffff);
 347 }
 348
 349 // end of GroundRadar.cxx