1 // tileentry.cxx -- routines to handle a scenery tile
3 // Written by Curtis Olson, started May 1998.
5 // Copyright (C) 1998 - 2001 Curtis L. Olson - http://www.flightgear.org/~curt
7 // This program is free software; you can redistribute it and/or
8 // modify it under the terms of the GNU General Public License as
9 // published by the Free Software Foundation; either version 2 of the
10 // License, or (at your option) any later version.
12 // This program is distributed in the hope that it will be useful, but
13 // WITHOUT ANY WARRANTY; without even the implied warranty of
14 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 // General Public License for more details.
17 // You should have received a copy of the GNU General Public License
18 // along with this program; if not, write to the Free Software
19 // Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
23 # include <simgear_config.h>
26 #include "ReaderWriterSTG.hxx"
29 #include <osg/MatrixTransform>
30 #include <osg/PagedLOD>
31 #include <osg/ProxyNode>
32 #include <osgUtil/LineSegmentIntersector>
33 #include <osgUtil/IntersectionVisitor>
35 #include <osgDB/FileNameUtils>
36 #include <osgDB/FileUtils>
37 #include <osgDB/Registry>
38 #include <osgDB/ReaderWriter>
39 #include <osgDB/ReadFile>
41 #include <simgear/math/SGGeometry.hxx>
42 #include <simgear/bucket/newbucket.hxx>
43 #include <simgear/debug/logstream.hxx>
44 #include <simgear/misc/sgstream.hxx>
45 #include <simgear/scene/util/OptionsReadFileCallback.hxx>
46 #include <simgear/scene/util/OsgMath.hxx>
47 #include <simgear/scene/util/RenderConstants.hxx>
48 #include <simgear/scene/util/SGReaderWriterOptions.hxx>
49 #include <simgear/scene/tgdb/apt_signs.hxx>
50 #include <simgear/scene/tgdb/obj.hxx>
52 #include "SGOceanTile.hxx"
56 /// Ok, this is a hack - we do not exactly know if it's an airport or not.
57 /// This feature might also vanish again later. This is currently to
58 /// support testing an external ai component that just loads the the airports
59 /// and supports ground queries on only these areas.
60 static bool isAirportBtg(const std::string& name)
64 if (name.substr(4, 8) != ".btg")
66 for (unsigned i = 0; i < 4; ++i) {
67 if (name[i] < 'A' || 'Z' < name[i])
74 static SGBucket bucketIndexFromFileName(const std::string& fileName)
76 // Extract the bucket from the filename
77 std::istringstream ss(osgDB::getNameLessExtension(fileName));
83 return SGBucket(index);
86 struct ReaderWriterSTG::_ModelBin {
88 std::string _errorLocation;
91 osg::ref_ptr<SGReaderWriterOptions> _options;
93 struct _ObjectStatic {
94 _ObjectStatic() : _agl(false), _proxy(false), _lon(0), _lat(0), _elev(0), _hdg(0), _pitch(0), _roll(0) { }
95 std::string _errorLocation;
100 double _lon, _lat, _elev;
101 double _hdg, _pitch, _roll;
102 osg::ref_ptr<SGReaderWriterOptions> _options;
105 _Sign() : _agl(false), _lon(0), _lat(0), _elev(0), _hdg(0), _size(-1) { }
106 std::string _errorLocation;
110 double _lon, _lat, _elev;
115 class DelayLoadReadFileCallback : public OptionsReadFileCallback {
117 virtual osgDB::ReaderWriter::ReadResult
118 readNode(const std::string&, const osgDB::Options*)
120 osg::ref_ptr<osg::Group> group = new osg::Group;
121 group->setDataVariance(osg::Object::STATIC);
123 for (std::list<_ObjectStatic>::iterator i = _objectStaticList.begin(); i != _objectStaticList.end(); ++i) {
124 osg::ref_ptr<osg::Node> node;
126 osg::ref_ptr<osg::ProxyNode> proxy = new osg::ProxyNode;
127 proxy->setLoadingExternalReferenceMode(osg::ProxyNode::DEFER_LOADING_TO_DATABASE_PAGER);
128 proxy->setFileName(0, i->_name);
129 proxy->setDatabaseOptions(i->_options.get());
132 node = osgDB::readRefNodeFile(i->_name, i->_options.get());
134 SG_LOG(SG_TERRAIN, SG_ALERT, i->_errorLocation << ": Failed to load "
135 << i->_token << " '" << i->_name << "'");
139 if (SGPath(i->_name).lower_extension() == "ac")
140 node->setNodeMask(~simgear::MODELLIGHT_BIT);
143 matrix = makeZUpFrame(SGGeod::fromDegM(i->_lon, i->_lat, i->_elev));
144 matrix.preMultRotate(osg::Quat(SGMiscd::deg2rad(i->_hdg), osg::Vec3(0, 0, 1)));
145 matrix.preMultRotate(osg::Quat(SGMiscd::deg2rad(i->_pitch), osg::Vec3(0, 1, 0)));
146 matrix.preMultRotate(osg::Quat(SGMiscd::deg2rad(i->_roll), osg::Vec3(1, 0, 0)));
148 osg::MatrixTransform* matrixTransform;
149 matrixTransform = new osg::MatrixTransform(matrix);
150 matrixTransform->setDataVariance(osg::Object::STATIC);
151 matrixTransform->addChild(node.get());
152 group->addChild(matrixTransform);
155 simgear::AirportSignBuilder signBuilder(_options->getMaterialLib(), _bucket.get_center());
156 for (std::list<_Sign>::iterator i = _signList.begin(); i != _signList.end(); ++i)
157 signBuilder.addSign(SGGeod::fromDegM(i->_lon, i->_lat, i->_elev), i->_hdg, i->_name, i->_size);
158 if (signBuilder.getSignsGroup())
159 group->addChild(signBuilder.getSignsGroup());
161 return group.release();
164 std::list<_ObjectStatic> _objectStaticList;
165 std::list<_Sign> _signList;
167 /// The original options to use for this bunch of models
168 osg::ref_ptr<SGReaderWriterOptions> _options;
176 SGReaderWriterOptions* sharedOptions(const std::string& filePath, const osgDB::Options* options)
178 osg::ref_ptr<SGReaderWriterOptions> sharedOptions;
179 sharedOptions = SGReaderWriterOptions::copyOrCreate(options);
180 sharedOptions->getDatabasePathList().clear();
182 SGPath path = filePath;
183 path.append(".."); path.append(".."); path.append("..");
184 sharedOptions->getDatabasePathList().push_back(path.str());
185 std::string fg_root = options->getPluginStringData("SimGear::FG_ROOT");
186 sharedOptions->getDatabasePathList().push_back(fg_root);
188 return sharedOptions.release();
190 SGReaderWriterOptions* staticOptions(const std::string& filePath, const osgDB::Options* options)
192 osg::ref_ptr<SGReaderWriterOptions> staticOptions;
193 staticOptions = SGReaderWriterOptions::copyOrCreate(options);
194 staticOptions->getDatabasePathList().clear();
196 staticOptions->getDatabasePathList().push_back(filePath);
197 staticOptions->setObjectCacheHint(osgDB::Options::CACHE_NONE);
199 return staticOptions.release();
202 double elevation(osg::Group& group, const SGGeod& geod)
204 SGVec3d start = SGVec3d::fromGeod(SGGeod::fromGeodM(geod, 10000));
205 SGVec3d end = SGVec3d::fromGeod(SGGeod::fromGeodM(geod, -1000));
207 osg::ref_ptr<osgUtil::LineSegmentIntersector> intersector;
208 intersector = new osgUtil::LineSegmentIntersector(toOsg(start), toOsg(end));
209 osgUtil::IntersectionVisitor visitor(intersector.get());
210 group.accept(visitor);
212 if (!intersector->containsIntersections())
215 SGVec3d cart = toSG(intersector->getFirstIntersection().getWorldIntersectPoint());
216 return SGGeod::fromCart(cart).getElevationM();
219 bool read(const std::string& absoluteFileName, const osgDB::Options* options)
221 if (absoluteFileName.empty())
224 sg_gzifstream stream(absoluteFileName);
225 if (!stream.is_open())
228 SG_LOG(SG_TERRAIN, SG_INFO, "Loading stg file " << absoluteFileName);
230 std::string filePath = osgDB::getFilePath(absoluteFileName);
232 // do only load airport btg files.
233 bool onlyAirports = options->getPluginStringData("SimGear::FG_ONLY_AIRPORTS") == "ON";
234 // do only load terrain btg files
235 bool onlyTerrain = options->getPluginStringData("SimGear::FG_ONLY_TERRAIN") == "ON";
237 while (!stream.eof()) {
240 std::getline(stream, line);
243 std::string::size_type hash_pos = line.find('#');
244 if (hash_pos != std::string::npos)
245 line.resize(hash_pos);
247 // and process further
248 std::stringstream in(line);
257 // Then there is always a name
261 SGPath path = filePath;
264 if (token == "OBJECT_BASE") {
265 // Load only once (first found)
266 SG_LOG( SG_TERRAIN, SG_BULK, " " << token << " " << name );
268 if (!onlyAirports || isAirportBtg(name)) {
270 obj._errorLocation = absoluteFileName;
272 obj._name = path.str();
273 obj._options = staticOptions(filePath, options);
274 _objectList.push_back(obj);
277 } else if (token == "OBJECT") {
278 if (!onlyAirports || isAirportBtg(name)) {
280 obj._errorLocation = absoluteFileName;
282 obj._name = path.str();
283 obj._options = staticOptions(filePath, options);
284 _objectList.push_back(obj);
289 if (token == "OBJECT_STATIC" || token == "OBJECT_STATIC_AGL") {
291 osg::ref_ptr<SGReaderWriterOptions> opt;
292 opt = staticOptions(filePath, options);
293 if (SGPath(name).lower_extension() == "ac")
294 opt->setInstantiateEffects(true);
296 opt->setInstantiateEffects(false);
298 obj._errorLocation = absoluteFileName;
301 obj._agl = (token == "OBJECT_STATIC_AGL");
303 in >> obj._lon >> obj._lat >> obj._elev >> obj._hdg >> obj._pitch >> obj._roll;
305 _objectStaticList.push_back(obj);
308 } else if (token == "OBJECT_SHARED" || token == "OBJECT_SHARED_AGL") {
310 osg::ref_ptr<SGReaderWriterOptions> opt;
311 opt = sharedOptions(filePath, options);
312 if (SGPath(name).lower_extension() == "ac")
313 opt->setInstantiateEffects(true);
315 opt->setInstantiateEffects(false);
317 obj._errorLocation = absoluteFileName;
320 obj._agl = (token == "OBJECT_SHARED_AGL");
322 in >> obj._lon >> obj._lat >> obj._elev >> obj._hdg >> obj._pitch >> obj._roll;
324 _objectStaticList.push_back(obj);
327 } else if (token == "OBJECT_SIGN" || token == "OBJECT_SIGN_AGL") {
332 sign._agl = (token == "OBJECT_SIGN_AGL");
333 in >> sign._lon >> sign._lat >> sign._elev >> sign._hdg >> sign._size;
334 _signList.push_back(sign);
338 SG_LOG( SG_TERRAIN, SG_ALERT, absoluteFileName
339 << ": Unknown token '" << token << "'" );
347 osg::Node* load(const SGBucket& bucket, const osgDB::Options* opt)
349 osg::ref_ptr<SGReaderWriterOptions> options;
350 options = SGReaderWriterOptions::copyOrCreate(opt);
352 osg::ref_ptr<osg::Group> terrainGroup = new osg::Group;
353 terrainGroup->setDataVariance(osg::Object::STATIC);
356 for (std::list<_Object>::iterator i = _objectList.begin(); i != _objectList.end(); ++i) {
357 osg::ref_ptr<osg::Node> node;
358 node = osgDB::readRefNodeFile(i->_name, i->_options.get());
360 SG_LOG(SG_TERRAIN, SG_ALERT, i->_errorLocation << ": Failed to load "
361 << i->_token << " '" << i->_name << "'");
364 terrainGroup->addChild(node.get());
367 SG_LOG(SG_TERRAIN, SG_INFO, " Generating ocean tile");
369 osg::Node* node = SGOceanTile(bucket, options->getMaterialLib());
371 terrainGroup->addChild(node);
373 SG_LOG( SG_TERRAIN, SG_ALERT,
374 "Warning: failed to generate ocean tile!" );
378 for (std::list<_ObjectStatic>::iterator i = _objectStaticList.begin(); i != _objectStaticList.end(); ++i) {
381 i->_elev += elevation(*terrainGroup, SGGeod::fromDeg(i->_lon, i->_lat));
384 for (std::list<_Sign>::iterator i = _signList.begin(); i != _signList.end(); ++i) {
387 i->_elev += elevation(*terrainGroup, SGGeod::fromDeg(i->_lon, i->_lat));
390 if (_objectStaticList.empty() && _signList.empty()) {
391 // The simple case, just return the terrain group
392 return terrainGroup.release();
394 osg::PagedLOD* pagedLOD = new osg::PagedLOD;
395 pagedLOD->setCenterMode(osg::PagedLOD::USE_BOUNDING_SPHERE_CENTER);
397 // This should be visible in any case.
398 // If this is replaced by some lower level of detail, the parent LOD node handles this.
399 pagedLOD->addChild(terrainGroup, 0, std::numeric_limits<float>::max());
401 // we just need to know about the read file callback that itself holds the data
402 osg::ref_ptr<DelayLoadReadFileCallback> readFileCallback = new DelayLoadReadFileCallback;
403 readFileCallback->_objectStaticList = _objectStaticList;
404 readFileCallback->_signList = _signList;
405 readFileCallback->_options = options;
406 readFileCallback->_bucket = bucket;
407 osg::ref_ptr<osgDB::Options> callbackOptions = new osgDB::Options;
408 callbackOptions->setReadFileCallback(readFileCallback.get());
409 pagedLOD->setDatabaseOptions(callbackOptions.get());
411 pagedLOD->setFileName(pagedLOD->getNumChildren(), "Dummy name - use the stored data in the read file callback");
412 pagedLOD->setRange(pagedLOD->getNumChildren(), 0, 30000);
419 std::list<_Object> _objectList;
420 std::list<_ObjectStatic> _objectStaticList;
421 std::list<_Sign> _signList;
424 ReaderWriterSTG::ReaderWriterSTG()
426 supportsExtension("stg", "SimGear stg database format");
429 ReaderWriterSTG::~ReaderWriterSTG()
433 const char* ReaderWriterSTG::className() const
435 return "STG Database reader";
438 osgDB::ReaderWriter::ReadResult
439 ReaderWriterSTG::readNode(const std::string& fileName, const osgDB::Options* options) const
442 SGBucket bucket(bucketIndexFromFileName(fileName));
444 // We treat 123.stg different than ./123.stg.
445 // The difference is that ./123.stg as well as any absolute path
446 // really loads the given stg file and only this.
447 // In contrast 123.stg uses the search paths to load a set of stg
448 // files spread across the scenery directories.
449 if (osgDB::getSimpleFileName(fileName) != fileName) {
450 if (!modelBin.read(fileName, options))
451 return ReadResult::FILE_NOT_FOUND;
453 // For stg meta files, we need options for the search path.
455 return ReadResult::FILE_NOT_FOUND;
457 SG_LOG(SG_TERRAIN, SG_INFO, "Loading tile " << fileName);
459 std::string basePath = bucket.gen_base_path();
461 // Stop scanning once an object base is found
462 // This is considered a meta file, so apply the scenery path search
463 const osgDB::FilePathList& filePathList = options->getDatabasePathList();
464 for (osgDB::FilePathList::const_iterator i = filePathList.begin();
465 i != filePathList.end() && !modelBin._foundBase; ++i) {
467 objects.append("Objects");
468 objects.append(basePath);
469 objects.append(fileName);
470 modelBin.read(objects.str(), options);
473 terrain.append("Terrain");
474 terrain.append(basePath);
475 terrain.append(fileName);
476 modelBin.read(terrain.str(), options);
480 return modelBin.load(bucket, options);