1 // mat.hxx -- a material in the scene graph.
2 // TODO: this class needs to be renamed.
4 // Written by Curtis Olson, started May 1998.
5 // Overhauled by David Megginson, December 2001
7 // Copyright (C) 1998 - 2000 Curtis L. Olson - http://www.flightgear.org/~curt
9 // This program is free software; you can redistribute it and/or
10 // modify it under the terms of the GNU General Public License as
11 // published by the Free Software Foundation; either version 2 of the
12 // License, or (at your option) any later version.
14 // This program is distributed in the hope that it will be useful, but
15 // WITHOUT ANY WARRANTY; without even the implied warranty of
16 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 // General Public License for more details.
19 // You should have received a copy of the GNU General Public License
20 // along with this program; if not, write to the Free Software
21 // Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
30 # error This library requires C++
33 #include <simgear/compiler.h>
35 #include STL_STRING // Standard C++ string library
39 #include <simgear/math/SGMath.hxx>
41 #include <osg/ref_ptr>
42 #include <osg/StateSet>
44 #include <simgear/props/props.hxx>
45 #include <simgear/structure/SGSharedPtr.hxx>
46 #include <simgear/scene/util/SGSceneFeatures.hxx>
48 #include "matmodel.hxx"
55 class SGMaterialGlyph;
58 * A material in the scene graph.
60 * A material represents information about a single surface type
61 * in the 3D scene graph, including texture, colour, lighting,
62 * tiling, and so on; most of the materials in FlightGear are
63 * defined in the $FG_ROOT/materials.xml file, and can be changed
66 class SGMaterial : public SGReferenced {
71 ////////////////////////////////////////////////////////////////////
72 // Public Constructors.
73 ////////////////////////////////////////////////////////////////////
76 * Construct a material from a set of properties.
78 * @param props A property node containing subnodes with the
79 * state information for the material. This node is usually
80 * loaded from the $FG_ROOT/materials.xml file.
82 SGMaterial( const string &fg_root, const SGPropertyNode *props, const char *season );
86 * Construct a material from an absolute texture path.
88 * @param texture_path A string containing an absolute path
89 * to a texture file (usually RGB).
91 SGMaterial( const string &texpath );
95 * Construct a material around an existing state.
97 * This constructor allows the application to create a custom,
98 * low-level state for the scene graph and wrap a material around
99 * it. Note: the pointer ownership is transferred to the material.
101 * @param s The state for this material.
103 SGMaterial( osg::StateSet *s );
112 ////////////////////////////////////////////////////////////////////
114 ////////////////////////////////////////////////////////////////////
117 * Get the textured state.
119 osg::StateSet *get_state (int n = -1);
123 * Get the number of textures assigned to this material.
125 inline int get_num() const { return _status.size(); }
129 * Get the xsize of the texture, in meters.
131 inline double get_xsize() const { return xsize; }
135 * Get the ysize of the texture, in meters.
137 inline double get_ysize() const { return ysize; }
141 * Get the light coverage.
143 * A smaller number means more generated night lighting.
145 * @return The area (m^2?) covered by each light.
147 inline double get_light_coverage () const { return light_coverage; }
150 * Return if the surface material is solid, if it is not solid, a fluid
151 * can be assumed, that is usually water.
153 bool get_solid () const { return solid; }
156 * Get the friction factor for that material
158 double get_friction_factor () const { return friction_factor; }
161 * Get the rolling friction for that material
163 double get_rolling_friction () const { return rolling_friction; }
166 * Get the bumpines for that material
168 double get_bumpiness () const { return bumpiness; }
171 * Get the load resistance
173 double get_load_resistance () const { return load_resistance; }
176 * Get the list of names for this material
178 const vector<string>& get_names() const { return _names; }
181 * add the given name to the list of names this material is known
183 void add_name(const string& name) { _names.push_back(name); }
186 * Get the number of randomly-placed objects defined for this material.
188 int get_object_group_count () const { return object_groups.size(); }
191 * Get a randomly-placed object for this material.
193 SGMatModelGroup * get_object_group (int index) const {
194 return object_groups[index];
198 * Return pointer to glyph class, or 0 if it doesn't exist.
200 SGMaterialGlyph * get_glyph (const string& name) const;
202 void set_light_color(const SGVec4f& color)
203 { emission = color; }
204 const SGVec4f& get_light_color() const
207 SGVec2f get_tex_coord_scale() const
209 float tex_width = get_xsize();
210 float tex_height = get_ysize();
212 return SGVec2f((0 < tex_width) ? 1000.0f/tex_width : 1.0f,
213 (0 < tex_height) ? 1000.0f/tex_height : 1.0f);
219 ////////////////////////////////////////////////////////////////////
220 // Protected methods.
221 ////////////////////////////////////////////////////////////////////
224 * Initialization method, invoked by all public constructors.
230 struct _internal_state {
231 _internal_state( osg::StateSet *s, const string &t, bool l )
232 : state(s), texture_path(t), texture_loaded(l) {}
233 osg::ref_ptr<osg::StateSet> state;
241 ////////////////////////////////////////////////////////////////////
243 ////////////////////////////////////////////////////////////////////
246 vector<_internal_state> _status;
248 // Round-robin counter
249 mutable unsigned int _current_ptr;
260 // coverage of night lighting.
261 double light_coverage;
263 // True if the material is solid, false if it is a fluid
266 // the friction factor of that surface material
267 double friction_factor;
269 // the rolling friction of that surface material
270 double rolling_friction;
272 // the bumpiness of that surface material
275 // the load resistance of that surface material
276 double load_resistance;
278 // material properties
279 SGVec4f ambient, diffuse, specular, emission;
282 // the list of names for this material. May be empty.
283 vector<string> _names;
285 vector<SGSharedPtr<SGMatModelGroup> > object_groups;
287 // taxiway-/runway-sign texture elements
288 map<string, SGSharedPtr<SGMaterialGlyph> > glyphs;
291 ////////////////////////////////////////////////////////////////////
292 // Internal constructors and methods.
293 ////////////////////////////////////////////////////////////////////
295 SGMaterial( const string &fg_root, const SGMaterial &mat ); // unimplemented
297 void read_properties( const string &fg_root, const SGPropertyNode *props, const char *season );
298 void build_state( bool defer_tex_load );
299 void set_state( osg::StateSet *s );
301 void assignTexture( osg::StateSet *state, const std::string &fname, int _wrapu = TRUE, int _wrapv = TRUE, int _mipmap = TRUE );
306 class SGMaterialGlyph : public SGReferenced {
308 SGMaterialGlyph(SGPropertyNode *);
309 inline double get_left() const { return _left; }
310 inline double get_right() const { return _right; }
311 inline double get_width() const { return _right - _left; }
318 class SGMaterialUserData : public osg::Referenced {
320 SGMaterialUserData(const SGMaterial* material) :
323 const SGMaterial* getMaterial() const
324 { return mMaterial; }
326 // this cannot be an SGSharedPtr since that would create a cicrular reference
327 // making it impossible to ever free the space needed by SGMaterial
328 const SGMaterial* mMaterial;
332 SGSetTextureFilter( int max);
335 SGGetTextureFilter();
337 #endif // _SG_MAT_HXX