1 // matobj.cxx -- class to handle material properties
3 // Written by Curtis Olson, started May 1998.
5 // Copyright (C) 1998 - 2003 Curtis L. Olson - curt@flightgear.org
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., 675 Mass Ave, Cambridge, MA 02139, USA.
25 # include <simgear_config.h>
28 #include <simgear/compiler.h>
33 #include <simgear/compiler.h>
35 #ifdef SG_MATH_EXCEPTION_CLASH
39 #include <simgear/debug/logstream.hxx>
40 #include <simgear/math/sg_random.h>
41 #include <simgear/misc/sg_path.hxx>
42 #include <simgear/misc/sgstream.hxx>
43 #include <simgear/scene/model/loader.hxx>
48 ////////////////////////////////////////////////////////////////////////
49 // Local static functions.
50 ////////////////////////////////////////////////////////////////////////
53 * Internal method to test whether a file exists.
55 * TODO: this should be moved to a SimGear library of local file
59 local_file_exists( const string& path ) {
60 sg_gzifstream in( path );
61 if ( ! in.is_open() ) {
70 ////////////////////////////////////////////////////////////////////////
71 // Implementation of SGMatObject.
72 ////////////////////////////////////////////////////////////////////////
74 SGMatObject::SGMatObject (const SGPropertyNode * node, double range_m)
75 : _models_loaded(false),
76 _coverage_m2(node->getDoubleValue("coverage-m2", 1000000)),
80 if (_coverage_m2 < 1000) {
81 SG_LOG(SG_INPUT, SG_ALERT, "Random object coverage " << _coverage_m2
82 << " is too small, forcing, to 1000");
86 // Note all the model paths
87 vector <SGPropertyNode_ptr> path_nodes = node->getChildren("path");
88 for (unsigned int i = 0; i < path_nodes.size(); i++)
89 _paths.push_back(path_nodes[i]->getStringValue());
91 // Note the heading type
92 string hdg = node->getStringValue("heading-type", "fixed");
94 _heading_type = HEADING_FIXED;
95 } else if (hdg == "billboard") {
96 _heading_type = HEADING_BILLBOARD;
97 } else if (hdg == "random") {
98 _heading_type = HEADING_RANDOM;
100 _heading_type = HEADING_FIXED;
101 SG_LOG(SG_INPUT, SG_ALERT, "Unknown heading type: " << hdg
102 << "; using 'fixed' instead.");
105 // uncomment to preload models
109 SGMatObject::~SGMatObject ()
111 for (unsigned int i = 0; i < _models.size(); i++) {
112 if (_models[i] != 0) {
120 SGMatObject::get_model_count( SGModelLoader *loader,
121 const string &fg_root,
122 SGPropertyNode *prop_root,
123 double sim_time_sec )
125 load_models( loader, fg_root, prop_root, sim_time_sec );
126 return _models.size();
130 SGMatObject::load_models ( SGModelLoader *loader,
131 const string &fg_root,
132 SGPropertyNode *prop_root,
133 double sim_time_sec )
135 // Load model only on demand
136 if (!_models_loaded) {
137 for (unsigned int i = 0; i < _paths.size(); i++) {
138 ssgEntity *entity = loader->load_model( fg_root, _paths[i],
139 prop_root, sim_time_sec );
141 // FIXME: this stuff can be handled
142 // in the XML wrapper as well (at least,
143 // the billboarding should be handled
145 float ranges[] = {0, _range_m};
146 ssgRangeSelector * lod = new ssgRangeSelector;
148 lod->setRanges(ranges, 2);
149 if (_heading_type == HEADING_BILLBOARD) {
150 ssgCutout * cutout = new ssgCutout(false);
151 cutout->addKid(entity);
156 _models.push_back(lod);
158 SG_LOG(SG_INPUT, SG_ALERT, "Failed to load object " << _paths[i]);
162 _models_loaded = true;
166 SGMatObject::get_model( int index,
167 SGModelLoader *loader,
168 const string &fg_root,
169 SGPropertyNode *prop_root,
170 double sim_time_sec )
172 load_models( loader, fg_root, prop_root, sim_time_sec ); // comment this out if preloading models
173 return _models[index];
177 SGMatObject::get_random_model( SGModelLoader *loader,
178 const string &fg_root,
179 SGPropertyNode *prop_root,
180 double sim_time_sec )
182 load_models( loader, fg_root, prop_root, sim_time_sec ); // comment this out if preloading models
183 int nModels = _models.size();
184 int index = int(sg_random() * nModels);
185 if (index >= nModels)
187 return _models[index];
191 SGMatObject::get_coverage_m2 () const
196 SGMatObject::HeadingType
197 SGMatObject::get_heading_type () const
199 return _heading_type;
204 ////////////////////////////////////////////////////////////////////////
205 // Implementation of SGMatObjectGroup.
206 ////////////////////////////////////////////////////////////////////////
208 SGMatObjectGroup::SGMatObjectGroup (SGPropertyNode * node)
209 : _range_m(node->getDoubleValue("range-m", 2000))
211 // Load the object subnodes
212 vector<SGPropertyNode_ptr> object_nodes =
213 ((SGPropertyNode *)node)->getChildren("object");
214 for (unsigned int i = 0; i < object_nodes.size(); i++) {
215 const SGPropertyNode * object_node = object_nodes[i];
216 if (object_node->hasChild("path"))
217 _objects.push_back(new SGMatObject(object_node, _range_m));
219 SG_LOG(SG_INPUT, SG_ALERT, "No path supplied for object");
223 SGMatObjectGroup::~SGMatObjectGroup ()
225 for (unsigned int i = 0; i < _objects.size(); i++) {
232 SGMatObjectGroup::get_range_m () const
238 SGMatObjectGroup::get_object_count () const
240 return _objects.size();
244 SGMatObjectGroup::get_object (int index) const
246 return _objects[index];