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 * Get the forest coverage.
152 * A smaller number means more generated forest canopy.
154 * @return The area (m^2) covered by each canopy.
156 inline double get_tree_coverage () const { return tree_coverage; }
159 * Get the forest height.
161 * @return The average height of the trees.
163 inline double get_tree_height () const { return tree_height; }
166 * Get the forest width.
168 * @return The average width of the trees.
170 inline double get_tree_width () const { return tree_width; }
173 * Get the forest LoD range.
175 * @return The LoD range for the trees.
177 inline double get_tree_range () const { return tree_range; }
180 * Get the list of textures to use for trees in the forest
182 * @return the vector of forest textures to use.
184 inline vector<string> get_tree_textures () const { return tree_textures; }
187 * Return if the surface material is solid, if it is not solid, a fluid
188 * can be assumed, that is usually water.
190 bool get_solid () const { return solid; }
193 * Get the friction factor for that material
195 double get_friction_factor () const { return friction_factor; }
198 * Get the rolling friction for that material
200 double get_rolling_friction () const { return rolling_friction; }
203 * Get the bumpines for that material
205 double get_bumpiness () const { return bumpiness; }
208 * Get the load resistance
210 double get_load_resistance () const { return load_resistance; }
213 * Get the list of names for this material
215 const vector<string>& get_names() const { return _names; }
218 * add the given name to the list of names this material is known
220 void add_name(const string& name) { _names.push_back(name); }
223 * Get the number of randomly-placed objects defined for this material.
225 int get_object_group_count () const { return object_groups.size(); }
228 * Get a randomly-placed object for this material.
230 SGMatModelGroup * get_object_group (int index) const {
231 return object_groups[index];
235 * Return pointer to glyph class, or 0 if it doesn't exist.
237 SGMaterialGlyph * get_glyph (const string& name) const;
239 void set_light_color(const SGVec4f& color)
240 { emission = color; }
241 const SGVec4f& get_light_color() const
244 SGVec2f get_tex_coord_scale() const
246 float tex_width = get_xsize();
247 float tex_height = get_ysize();
249 return SGVec2f((0 < tex_width) ? 1000.0f/tex_width : 1.0f,
250 (0 < tex_height) ? 1000.0f/tex_height : 1.0f);
256 ////////////////////////////////////////////////////////////////////
257 // Protected methods.
258 ////////////////////////////////////////////////////////////////////
261 * Initialization method, invoked by all public constructors.
267 struct _internal_state {
268 _internal_state( osg::StateSet *s, const string &t, bool l )
269 : state(s), texture_path(t), texture_loaded(l) {}
270 osg::ref_ptr<osg::StateSet> state;
278 ////////////////////////////////////////////////////////////////////
280 ////////////////////////////////////////////////////////////////////
283 vector<_internal_state> _status;
285 // Round-robin counter
286 mutable unsigned int _current_ptr;
297 // coverage of night lighting.
298 double light_coverage;
301 double tree_coverage;
303 // Range at which trees become visible
306 // Height of the tree
312 // True if the material is solid, false if it is a fluid
315 // the friction factor of that surface material
316 double friction_factor;
318 // the rolling friction of that surface material
319 double rolling_friction;
321 // the bumpiness of that surface material
324 // the load resistance of that surface material
325 double load_resistance;
327 // material properties
328 SGVec4f ambient, diffuse, specular, emission;
331 // the list of names for this material. May be empty.
332 vector<string> _names;
334 vector<SGSharedPtr<SGMatModelGroup> > object_groups;
336 // taxiway-/runway-sign texture elements
337 map<string, SGSharedPtr<SGMaterialGlyph> > glyphs;
339 // The list of forest textures, used when creating trees
340 vector<string> tree_textures;
342 ////////////////////////////////////////////////////////////////////
343 // Internal constructors and methods.
344 ////////////////////////////////////////////////////////////////////
346 SGMaterial( const string &fg_root, const SGMaterial &mat ); // unimplemented
348 void read_properties( const string &fg_root, const SGPropertyNode *props, const char *season );
349 void build_state( bool defer_tex_load );
350 void set_state( osg::StateSet *s );
352 void assignTexture( osg::StateSet *state, const std::string &fname, int _wrapu = TRUE, int _wrapv = TRUE, int _mipmap = TRUE );
357 class SGMaterialGlyph : public SGReferenced {
359 SGMaterialGlyph(SGPropertyNode *);
360 inline double get_left() const { return _left; }
361 inline double get_right() const { return _right; }
362 inline double get_width() const { return _right - _left; }
369 class SGMaterialUserData : public osg::Referenced {
371 SGMaterialUserData(const SGMaterial* material) :
374 const SGMaterial* getMaterial() const
375 { return mMaterial; }
377 // this cannot be an SGSharedPtr since that would create a cicrular reference
378 // making it impossible to ever free the space needed by SGMaterial
379 const SGMaterial* mMaterial;
383 SGSetTextureFilter( int max);
386 SGGetTextureFilter();
388 #endif // _SG_MAT_HXX