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.
28 #include <simgear/compiler.h>
30 #include <Main/main.hxx>
36 #include <osg/Geometry>
39 #include <osg/MatrixTransform>
40 #include <osg/NodeCallback>
43 #include <osgDB/ReadFile>
45 #include <simgear/bucket/newbucket.hxx>
46 #include <simgear/debug/logstream.hxx>
47 #include <simgear/math/polar3d.hxx>
48 #include <simgear/math/sg_geodesy.hxx>
49 #include <simgear/math/sg_random.h>
50 #include <simgear/misc/sgstream.hxx>
51 #include <simgear/scene/material/mat.hxx>
52 #include <simgear/scene/material/matlib.hxx>
53 #include <simgear/scene/tgdb/apt_signs.hxx>
54 #include <simgear/scene/tgdb/obj.hxx>
55 #include <simgear/scene/tgdb/SGReaderWriterBTGOptions.hxx>
56 #include <simgear/scene/model/placementtrans.hxx>
57 #include <simgear/scene/util/SGUpdateVisitor.hxx>
59 #include <Aircraft/aircraft.hxx>
60 #include <Include/general.hxx>
61 #include <Main/fg_props.hxx>
62 #include <Main/globals.hxx>
63 #include <Main/viewer.hxx>
64 #include <Scenery/scenery.hxx>
65 #include <Time/light.hxx>
67 #include "tileentry.hxx"
68 #include "tilemgr.hxx"
72 // FIXME: investigate what huge update flood is clamped away here ...
73 class FGTileUpdateCallback : public osg::NodeCallback {
75 virtual void operator()(osg::Node* node, osg::NodeVisitor* nv)
77 assert(dynamic_cast<SGUpdateVisitor*>(nv));
78 SGUpdateVisitor* updateVisitor = static_cast<SGUpdateVisitor*>(nv);
80 osg::Vec3 center = node->getBound().center();
81 double distance = dist(updateVisitor->getGlobalEyePos(),
82 SGVec3d(center[0], center[1], center[2]));
83 if (updateVisitor->getVisibility() + node->getBound().radius() < distance)
91 FGTileEntry::FGTileEntry ( const SGBucket& b )
93 terra_transform( new osg::Group ),
94 terra_range( new osg::LOD ),
100 terra_transform->setUpdateCallback(new FGTileUpdateCallback);
105 FGTileEntry::~FGTileEntry () {
108 static void WorldCoordinate( osg::Matrix& obj_pos, double lat,
109 double lon, double elev, double hdg )
111 double lon_rad = lon * SGD_DEGREES_TO_RADIANS;
112 double lat_rad = lat * SGD_DEGREES_TO_RADIANS;
113 double hdg_rad = hdg * SGD_DEGREES_TO_RADIANS;
116 Point3D geod( lon_rad, lat_rad, elev );
118 Point3D world_pos = sgGeodToCart( geod );
119 Point3D offset = world_pos;
123 double sin_lat = sin( lat_rad );
124 double cos_lat = cos( lat_rad );
125 double cos_lon = cos( lon_rad );
126 double sin_lon = sin( lon_rad );
127 double sin_hdg = sin( hdg_rad ) ;
128 double cos_hdg = cos( hdg_rad ) ;
130 mat[0][0] = cos_hdg * sin_lat * cos_lon - sin_hdg * sin_lon;
131 mat[0][1] = cos_hdg * sin_lat * sin_lon + sin_hdg * cos_lon;
132 mat[0][2] = -cos_hdg * cos_lat;
135 mat[1][0] = -sin_hdg * sin_lat * cos_lon - cos_hdg * sin_lon;
136 mat[1][1] = -sin_hdg * sin_lat * sin_lon + cos_hdg * cos_lon;
137 mat[1][2] = sin_hdg * cos_lat;
140 mat[2][0] = cos_lat * cos_lon;
141 mat[2][1] = cos_lat * sin_lon;
145 mat[3][0] = offset.x();
146 mat[3][1] = offset.y();
147 mat[3][2] = offset.z();
150 for (unsigned i = 0; i < 4; ++i)
151 for (unsigned j = 0; j < 4; ++j)
152 obj_pos(i, j) = mat[i][j];
156 // Free "n" leaf elements of an ssg tree. returns the number of
157 // elements freed. An empty branch node is considered a leaf. This
158 // is intended to spread the load of freeing a complex tile out over
160 static int fgPartialFreeSSGtree( osg::Group *b, int n ) {
161 int num_deletes = b->getNumChildren();
163 b->removeChildren(0, b->getNumChildren());
169 // Clean up the memory used by this tile and delete the arrays used by
170 // ssg as well as the whole ssg branch
171 bool FGTileEntry::free_tile() {
172 int delete_size = 100;
173 SG_LOG( SG_TERRAIN, SG_DEBUG,
174 "FREEING TILE = (" << tile_bucket << ")" );
176 SG_LOG( SG_TERRAIN, SG_DEBUG, "(start) free_tracker = " << free_tracker );
178 if ( !(free_tracker & NODES) ) {
179 free_tracker |= NODES;
180 } else if ( !(free_tracker & VEC_PTRS) ) {
181 free_tracker |= VEC_PTRS;
182 } else if ( !(free_tracker & TERRA_NODE) ) {
183 // delete the terrain branch (this should already have been
184 // disconnected from the scene graph)
185 SG_LOG( SG_TERRAIN, SG_DEBUG, "FREEING terra_transform" );
186 if ( fgPartialFreeSSGtree( terra_transform.get(), delete_size ) == 0 ) {
188 free_tracker |= TERRA_NODE;
190 } else if ( !(free_tracker & LIGHTMAPS) ) {
191 free_tracker |= LIGHTMAPS;
196 SG_LOG( SG_TERRAIN, SG_DEBUG, "(end) free_tracker = " << free_tracker );
198 // if we fall down to here, we still have work todo, return false
203 // Update the ssg transform node for this tile so it can be
204 // properly drawn relative to our (0,0,0) point
205 void FGTileEntry::prep_ssg_node(float vis) {
206 if ( !loaded ) return;
208 // visibility can change from frame to frame so we update the
209 // range selector cutoff's each time.
210 float bounding_radius = terra_range->getChild(0)->getBound().radius();
211 terra_range->setRange( 0, 0, vis + bounding_radius );
214 bool FGTileEntry::obj_load( const string& path,
215 osg::Group *geometry, bool is_base )
217 bool use_random_objects =
218 fgGetBool("/sim/rendering/random-objects", true);
220 // try loading binary format
221 osg::ref_ptr<SGReaderWriterBTGOptions> options
222 = new SGReaderWriterBTGOptions();
223 options->setMatlib(globals->get_matlib());
224 options->setCalcLights(is_base);
225 options->setUseRandomObjects(use_random_objects);
226 osg::Node* node = osgDB::readNodeFile(path, options.get());
228 geometry->addChild(node);
243 // storage class for deferred object processing in FGTileEntry::load()
245 Object(object_type t, const string& token, const SGPath& p, istream& in)
250 in >> lon >> lat >> elev >> hdg;
254 SG_LOG(SG_TERRAIN, SG_INFO, " " << token << " " << name);
256 SG_LOG(SG_TERRAIN, SG_INFO, " " << token << " " << name << " lon=" <<
257 lon << " lat=" << lat << " elev=" << elev << " hdg=" << hdg);
262 double lon, lat, elev, hdg;
267 FGTileEntry::load( const string_list &path_list, bool is_base )
269 bool found_tile_base = false;
272 vector<const Object*> objects;
274 string index_str = tile_bucket.gen_index_str();
275 SG_LOG( SG_TERRAIN, SG_INFO, "Loading tile " << index_str );
277 // scan and parse all files and store information
278 for (unsigned int i = 0; i < path_list.size(); i++) {
279 // If we found a terrain tile in Terrain/, we have to process the
280 // Objects/ dir in the same group, too, before we can stop scanning.
281 // FGGlobals::set_fg_scenery() inserts an empty string to path_list
283 if (path_list[i].empty()) {
290 bool has_base = false;
292 SGPath tile_path = path_list[i];
293 tile_path.append( tile_bucket.gen_base_path() );
295 SGPath basename = tile_path;
296 basename.append( index_str );
298 SG_LOG( SG_TERRAIN, SG_INFO, " Trying " << basename.str() );
301 // Check for master .stg (scene terra gear) file
302 SGPath stg_name = basename;
303 stg_name.concat( ".stg" );
305 sg_gzifstream in( stg_name.str() );
309 while ( ! in.eof() ) {
313 if ( token.empty() || token[0] == '#' ) {
317 // Load only once (first found)
318 if ( token == "OBJECT_BASE" ) {
320 in >> name >> ::skipws;
321 SG_LOG( SG_TERRAIN, SG_INFO, " " << token << " " << name );
323 if (!found_tile_base) {
324 found_tile_base = true;
327 object_base = tile_path;
328 object_base.append(name);
331 SG_LOG(SG_TERRAIN, SG_INFO, " (skipped)");
333 // Load only if base is not in another file
334 } else if ( token == "OBJECT" ) {
335 if (!found_tile_base || has_base)
336 objects.push_back(new Object(OBJECT, token, tile_path, in));
339 in >> name >> ::skipeol;
340 SG_LOG(SG_TERRAIN, SG_INFO, " " << token << " "
341 << name << " (skipped)");
345 } else if ( token == "OBJECT_STATIC" ) {
346 objects.push_back(new Object(OBJECT_STATIC, token, tile_path, in));
348 } else if ( token == "OBJECT_SHARED" ) {
349 objects.push_back(new Object(OBJECT_SHARED, token, tile_path, in));
351 } else if ( token == "OBJECT_SIGN" ) {
352 objects.push_back(new Object(OBJECT_SIGN, token, tile_path, in));
354 } else if ( token == "OBJECT_RUNWAY_SIGN" ) {
355 objects.push_back(new Object(OBJECT_RUNWAY_SIGN, token, tile_path, in));
358 SG_LOG( SG_TERRAIN, SG_DEBUG,
359 "Unknown token '" << token << "' in " << stg_name.str() );
366 // obj_load() will generate ground lighting for us ...
367 osg::Group* new_tile = new osg::Group;
369 if (found_tile_base) {
370 // load tile if found ...
371 obj_load( object_base.str(), new_tile, true );
374 // ... or generate an ocean tile on the fly
375 SG_LOG(SG_TERRAIN, SG_INFO, " Generating ocean tile");
376 if ( !SGGenTile( path_list[0], tile_bucket,
377 globals->get_matlib(), new_tile ) ) {
378 SG_LOG( SG_TERRAIN, SG_ALERT,
379 "Warning: failed to generate ocean tile!" );
384 // now that we have a valid center, process all the objects
385 for (unsigned int j = 0; j < objects.size(); j++) {
386 const Object *obj = objects[j];
388 if (obj->type == OBJECT) {
389 SGPath custom_path = obj->path;
390 custom_path.append( obj->name );
391 obj_load( custom_path.str(), new_tile, false );
393 } else if (obj->type == OBJECT_SHARED || obj->type == OBJECT_STATIC) {
394 // object loading is deferred to main render thread,
395 // but lets figure out the paths right now.
397 if ( obj->type == OBJECT_STATIC ) {
398 custom_path = obj->path;
400 custom_path = globals->get_fg_root();
402 custom_path.append( obj->name );
405 WorldCoordinate( obj_pos, obj->lat, obj->lon, obj->elev, obj->hdg );
407 osg::MatrixTransform *obj_trans = new osg::MatrixTransform;
408 obj_trans->setMatrix( obj_pos );
410 // wire as much of the scene graph together as we can
411 new_tile->addChild( obj_trans );
414 // push an entry onto the model load queue
416 = new FGDeferredModel( custom_path.str(),
420 obj->type == OBJECT_SHARED );
421 FGTileMgr::model_ready( dm );
424 } else if (obj->type == OBJECT_SIGN || obj->type == OBJECT_RUNWAY_SIGN) {
425 // load the object itself
426 SGPath custom_path = obj->path;
427 custom_path.append( obj->name );
430 WorldCoordinate( obj_pos, obj->lat, obj->lon, obj->elev, obj->hdg );
432 osg::MatrixTransform *obj_trans = new osg::MatrixTransform;
433 obj_trans->setMatrix( obj_pos );
435 osg::Node *custom_obj = 0;
436 if (obj->type == OBJECT_SIGN)
437 custom_obj = SGMakeSign(globals->get_matlib(), custom_path.str(), obj->name);
439 custom_obj = SGMakeRunwaySign(globals->get_matlib(), custom_path.str(), obj->name);
441 // wire the pieces together
442 if ( custom_obj != NULL ) {
443 obj_trans -> addChild( custom_obj );
445 new_tile->addChild( obj_trans );
451 terra_range->addChild( new_tile );
452 terra_transform->addChild( terra_range.get() );
456 FGTileEntry::add_ssg_nodes( osg::Group *terrain_branch )
458 // bump up the ref count so we can remove this later without
459 // having ssg try to free the memory.
460 terrain_branch->addChild( terra_transform.get() );
462 SG_LOG( SG_TERRAIN, SG_DEBUG,
463 "connected a tile into scene graph. terra_transform = "
464 << terra_transform.get() );
465 SG_LOG( SG_TERRAIN, SG_DEBUG, "num parents now = "
466 << terra_transform->getNumParents() );
473 FGTileEntry::disconnect_ssg_nodes()
475 SG_LOG( SG_TERRAIN, SG_DEBUG, "disconnecting ssg nodes" );
478 SG_LOG( SG_TERRAIN, SG_DEBUG, "removing a not-fully loaded tile!" );
480 SG_LOG( SG_TERRAIN, SG_DEBUG, "removing a fully loaded tile! terra_transform = " << terra_transform.get() );
483 // find the terrain branch parent
484 int pcount = terra_transform->getNumParents();
486 // find the first parent (should only be one)
487 osg::Group *parent = terra_transform->getParent( 0 ) ;
489 // disconnect the tile (we previously ref()'d it so it
490 // won't get freed now)
491 parent->removeChild( terra_transform.get() );
493 SG_LOG( SG_TERRAIN, SG_ALERT,
494 "parent pointer is NULL! Dying" );
498 SG_LOG( SG_TERRAIN, SG_ALERT,
499 "Parent count is zero for an ssg tile! Dying" );