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 <simgear/bucket/newbucket.hxx>
44 #include <simgear/debug/logstream.hxx>
45 #include <simgear/math/polar3d.hxx>
46 #include <simgear/math/sg_geodesy.hxx>
47 #include <simgear/math/sg_random.h>
48 #include <simgear/misc/sgstream.hxx>
49 #include <simgear/scene/material/mat.hxx>
50 #include <simgear/scene/material/matlib.hxx>
51 #include <simgear/scene/tgdb/apt_signs.hxx>
52 #include <simgear/scene/tgdb/obj.hxx>
53 #include <simgear/scene/model/placementtrans.hxx>
54 #include <simgear/scene/util/SGUpdateVisitor.hxx>
56 #include <Aircraft/aircraft.hxx>
57 #include <Include/general.hxx>
58 #include <Main/fg_props.hxx>
59 #include <Main/globals.hxx>
60 #include <Main/viewer.hxx>
61 #include <Scenery/scenery.hxx>
62 #include <Time/light.hxx>
64 #include "tileentry.hxx"
65 #include "tilemgr.hxx"
69 class FGTileUpdateCallback : public osg::NodeCallback {
71 virtual void operator()(osg::Node* node, osg::NodeVisitor* nv)
73 assert(dynamic_cast<SGUpdateVisitor*>(nv));
74 SGUpdateVisitor* updateVisitor = static_cast<SGUpdateVisitor*>(nv);
76 osg::Vec3 center = node->getBound().center();
77 double dist2 = distSqr(updateVisitor->getGlobalEyePos(),
78 SGVec3d(center[0], center[1], center[2]));
79 if (updateVisitor->getSqrVisibility() < dist2)
87 FGTileEntry::FGTileEntry ( const SGBucket& b )
89 terra_transform( new osg::Group ),
90 terra_range( new osg::LOD ),
96 terra_transform->setUpdateCallback(new FGTileUpdateCallback);
101 FGTileEntry::~FGTileEntry () {
104 static void WorldCoordinate( osg::Matrix& obj_pos, double lat,
105 double lon, double elev, double hdg )
107 double lon_rad = lon * SGD_DEGREES_TO_RADIANS;
108 double lat_rad = lat * SGD_DEGREES_TO_RADIANS;
109 double hdg_rad = hdg * SGD_DEGREES_TO_RADIANS;
112 Point3D geod( lon_rad, lat_rad, elev );
114 Point3D world_pos = sgGeodToCart( geod );
115 Point3D offset = world_pos;
119 double sin_lat = sin( lat_rad );
120 double cos_lat = cos( lat_rad );
121 double cos_lon = cos( lon_rad );
122 double sin_lon = sin( lon_rad );
123 double sin_hdg = sin( hdg_rad ) ;
124 double cos_hdg = cos( hdg_rad ) ;
126 mat[0][0] = cos_hdg * sin_lat * cos_lon - sin_hdg * sin_lon;
127 mat[0][1] = cos_hdg * sin_lat * sin_lon + sin_hdg * cos_lon;
128 mat[0][2] = -cos_hdg * cos_lat;
131 mat[1][0] = -sin_hdg * sin_lat * cos_lon - cos_hdg * sin_lon;
132 mat[1][1] = -sin_hdg * sin_lat * sin_lon + cos_hdg * cos_lon;
133 mat[1][2] = sin_hdg * cos_lat;
136 mat[2][0] = cos_lat * cos_lon;
137 mat[2][1] = cos_lat * sin_lon;
141 mat[3][0] = offset.x();
142 mat[3][1] = offset.y();
143 mat[3][2] = offset.z();
146 for (unsigned i = 0; i < 4; ++i)
147 for (unsigned j = 0; j < 4; ++j)
148 obj_pos(i, j) = mat[i][j];
152 // Free "n" leaf elements of an ssg tree. returns the number of
153 // elements freed. An empty branch node is considered a leaf. This
154 // is intended to spread the load of freeing a complex tile out over
156 static int fgPartialFreeSSGtree( osg::Group *b, int n ) {
157 int num_deletes = b->getNumChildren();
159 b->removeChildren(0, b->getNumChildren());
165 // Clean up the memory used by this tile and delete the arrays used by
166 // ssg as well as the whole ssg branch
167 bool FGTileEntry::free_tile() {
168 int delete_size = 100;
169 SG_LOG( SG_TERRAIN, SG_DEBUG,
170 "FREEING TILE = (" << tile_bucket << ")" );
172 SG_LOG( SG_TERRAIN, SG_DEBUG, "(start) free_tracker = " << free_tracker );
174 if ( !(free_tracker & NODES) ) {
175 free_tracker |= NODES;
176 } else if ( !(free_tracker & VEC_PTRS) ) {
177 free_tracker |= VEC_PTRS;
178 } else if ( !(free_tracker & TERRA_NODE) ) {
179 // delete the terrain branch (this should already have been
180 // disconnected from the scene graph)
181 SG_LOG( SG_TERRAIN, SG_DEBUG, "FREEING terra_transform" );
182 if ( fgPartialFreeSSGtree( terra_transform.get(), delete_size ) == 0 ) {
184 free_tracker |= TERRA_NODE;
186 } else if ( !(free_tracker & LIGHTMAPS) ) {
187 free_tracker |= LIGHTMAPS;
192 SG_LOG( SG_TERRAIN, SG_DEBUG, "(end) free_tracker = " << free_tracker );
194 // if we fall down to here, we still have work todo, return false
199 // Update the ssg transform node for this tile so it can be
200 // properly drawn relative to our (0,0,0) point
201 void FGTileEntry::prep_ssg_node(float vis) {
202 if ( !loaded ) return;
204 // visibility can change from frame to frame so we update the
205 // range selector cutoff's each time.
206 float bounding_radius = terra_range->getChild(0)->getBound().radius();
207 terra_range->setRange( 0, 0, vis + bounding_radius );
210 bool FGTileEntry::obj_load( const string& path,
211 osg::Group *geometry, bool is_base )
213 bool use_random_objects =
214 fgGetBool("/sim/rendering/random-objects", true);
216 // try loading binary format
217 osg::Node* node = SGLoadBTG(path, globals->get_matlib(), is_base, use_random_objects);
219 geometry->addChild(node);
234 // storage class for deferred object processing in FGTileEntry::load()
236 Object(object_type t, const string& token, const SGPath& p, istream& in)
241 in >> lon >> lat >> elev >> hdg;
245 SG_LOG(SG_TERRAIN, SG_INFO, " " << token << " " << name);
247 SG_LOG(SG_TERRAIN, SG_INFO, " " << token << " " << name << " lon=" <<
248 lon << " lat=" << lat << " elev=" << elev << " hdg=" << hdg);
253 double lon, lat, elev, hdg;
258 FGTileEntry::load( const string_list &path_list, bool is_base )
260 bool found_tile_base = false;
263 vector<const Object*> objects;
265 string index_str = tile_bucket.gen_index_str();
266 SG_LOG( SG_TERRAIN, SG_INFO, "Loading tile " << index_str );
268 // scan and parse all files and store information
269 for (unsigned int i = 0; i < path_list.size(); i++) {
270 // If we found a terrain tile in Terrain/, we have to process the
271 // Objects/ dir in the same group, too, before we can stop scanning.
272 // FGGlobals::set_fg_scenery() inserts an empty string to path_list
274 if (path_list[i].empty()) {
281 bool has_base = false;
283 SGPath tile_path = path_list[i];
284 tile_path.append( tile_bucket.gen_base_path() );
286 SGPath basename = tile_path;
287 basename.append( index_str );
289 SG_LOG( SG_TERRAIN, SG_INFO, " Trying " << basename.str() );
292 // Check for master .stg (scene terra gear) file
293 SGPath stg_name = basename;
294 stg_name.concat( ".stg" );
296 sg_gzifstream in( stg_name.str() );
300 while ( ! in.eof() ) {
304 if ( token[0] == '#' ) {
308 // Load only once (first found)
309 if ( token == "OBJECT_BASE" ) {
311 in >> name >> ::skipws;
312 SG_LOG( SG_TERRAIN, SG_INFO, " " << token << " " << name );
314 if (!found_tile_base) {
315 found_tile_base = true;
318 object_base = tile_path;
319 object_base.append(name);
322 SG_LOG(SG_TERRAIN, SG_INFO, " (skipped)");
324 // Load only if base is not in another file
325 } else if ( token == "OBJECT" ) {
326 if (!found_tile_base || has_base)
327 objects.push_back(new Object(OBJECT, token, tile_path, in));
330 in >> name >> ::skipeol;
331 SG_LOG(SG_TERRAIN, SG_INFO, " " << token << " "
332 << name << " (skipped)");
336 } else if ( token == "OBJECT_STATIC" ) {
337 objects.push_back(new Object(OBJECT_STATIC, token, tile_path, in));
339 } else if ( token == "OBJECT_SHARED" ) {
340 objects.push_back(new Object(OBJECT_SHARED, token, tile_path, in));
342 } else if ( token == "OBJECT_SIGN" ) {
343 objects.push_back(new Object(OBJECT_SIGN, token, tile_path, in));
345 } else if ( token == "OBJECT_RUNWAY_SIGN" ) {
346 objects.push_back(new Object(OBJECT_RUNWAY_SIGN, token, tile_path, in));
349 SG_LOG( SG_TERRAIN, SG_DEBUG,
350 "Unknown token '" << token << "' in " << stg_name.str() );
357 // obj_load() will generate ground lighting for us ...
358 osg::Group* new_tile = new osg::Group;
360 if (found_tile_base) {
361 // load tile if found ...
362 obj_load( object_base.str(), new_tile, true );
365 // ... or generate an ocean tile on the fly
366 SG_LOG(SG_TERRAIN, SG_INFO, " Generating ocean tile");
367 if ( !SGGenTile( path_list[0], tile_bucket,
368 globals->get_matlib(), new_tile ) ) {
369 SG_LOG( SG_TERRAIN, SG_ALERT,
370 "Warning: failed to generate ocean tile!" );
375 // now that we have a valid center, process all the objects
376 for (unsigned int j = 0; j < objects.size(); j++) {
377 const Object *obj = objects[j];
379 if (obj->type == OBJECT) {
380 SGPath custom_path = obj->path;
381 custom_path.append( obj->name );
382 obj_load( custom_path.str(), new_tile, false );
384 } else if (obj->type == OBJECT_SHARED || obj->type == OBJECT_STATIC) {
385 // object loading is deferred to main render thread,
386 // but lets figure out the paths right now.
388 if ( obj->type == OBJECT_STATIC ) {
389 custom_path = obj->path;
391 custom_path = globals->get_fg_root();
393 custom_path.append( obj->name );
396 WorldCoordinate( obj_pos, obj->lat, obj->lon, obj->elev, obj->hdg );
398 osg::MatrixTransform *obj_trans = new osg::MatrixTransform;
399 obj_trans->setMatrix( obj_pos );
401 // wire as much of the scene graph together as we can
402 new_tile->addChild( obj_trans );
405 // push an entry onto the model load queue
407 = new FGDeferredModel( custom_path.str(),
411 obj->type == OBJECT_SHARED );
412 FGTileMgr::model_ready( dm );
415 } else if (obj->type == OBJECT_SIGN || obj->type == OBJECT_RUNWAY_SIGN) {
416 // load the object itself
417 SGPath custom_path = obj->path;
418 custom_path.append( obj->name );
421 WorldCoordinate( obj_pos, obj->lat, obj->lon, obj->elev, obj->hdg );
423 osg::MatrixTransform *obj_trans = new osg::MatrixTransform;
424 obj_trans->setMatrix( obj_pos );
426 osg::Node *custom_obj = 0;
427 if (obj->type == OBJECT_SIGN)
428 custom_obj = SGMakeSign(globals->get_matlib(), custom_path.str(), obj->name);
430 custom_obj = SGMakeRunwaySign(globals->get_matlib(), custom_path.str(), obj->name);
432 // wire the pieces together
433 if ( custom_obj != NULL ) {
434 obj_trans -> addChild( custom_obj );
436 new_tile->addChild( obj_trans );
442 terra_range->addChild( new_tile );
443 terra_transform->addChild( terra_range.get() );
447 FGTileEntry::add_ssg_nodes( osg::Group *terrain_branch )
449 // bump up the ref count so we can remove this later without
450 // having ssg try to free the memory.
451 terrain_branch->addChild( terra_transform.get() );
453 SG_LOG( SG_TERRAIN, SG_DEBUG,
454 "connected a tile into scene graph. terra_transform = "
455 << terra_transform.get() );
456 SG_LOG( SG_TERRAIN, SG_DEBUG, "num parents now = "
457 << terra_transform->getNumParents() );
464 FGTileEntry::disconnect_ssg_nodes()
466 SG_LOG( SG_TERRAIN, SG_DEBUG, "disconnecting ssg nodes" );
469 SG_LOG( SG_TERRAIN, SG_DEBUG, "removing a not-fully loaded tile!" );
471 SG_LOG( SG_TERRAIN, SG_DEBUG, "removing a fully loaded tile! terra_transform = " << terra_transform.get() );
474 // find the terrain branch parent
475 int pcount = terra_transform->getNumParents();
477 // find the first parent (should only be one)
478 osg::Group *parent = terra_transform->getParent( 0 ) ;
480 // disconnect the tile (we previously ref()'d it so it
481 // won't get freed now)
482 parent->removeChild( terra_transform.get() );
484 SG_LOG( SG_TERRAIN, SG_ALERT,
485 "parent pointer is NULL! Dying" );
489 SG_LOG( SG_TERRAIN, SG_ALERT,
490 "Parent count is zero for an ssg tile! Dying" );