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 <string> // Standard C++ string library
39 #include <simgear/math/SGMath.hxx>
41 #include <simgear/scene/tgdb/SGTexturedTriangleBin.hxx>
43 #include <osg/ref_ptr>
44 #include <osg/Texture2D>
51 #include <simgear/scene/util/SGReaderWriterOptions.hxx>
52 #include <simgear/props/props.hxx>
53 #include <simgear/structure/SGSharedPtr.hxx>
54 #include <simgear/scene/util/SGSceneFeatures.hxx>
56 #include "matmodel.hxx"
61 void reload_shaders();
64 class SGMaterialGlyph;
67 * A material in the scene graph.
69 * A material represents information about a single surface type
70 * in the 3D scene graph, including texture, colour, lighting,
71 * tiling, and so on; most of the materials in FlightGear are
72 * defined in the $FG_ROOT/materials.xml file, and can be changed
75 class SGMaterial : public SGReferenced {
80 ////////////////////////////////////////////////////////////////////
81 // Public Constructors.
82 ////////////////////////////////////////////////////////////////////
85 * Construct a material from a set of properties.
87 * @param props A property node containing subnodes with the
88 * state information for the material. This node is usually
89 * loaded from the $FG_ROOT/materials.xml file.
91 SGMaterial( const osgDB::ReaderWriter::Options*, const SGPropertyNode *props);
93 SGMaterial(const simgear::SGReaderWriterOptions*,
94 const SGPropertyNode *props);
102 ////////////////////////////////////////////////////////////////////
104 ////////////////////////////////////////////////////////////////////
107 * Get the textured state.
109 simgear::Effect* get_effect(SGTexturedTriangleBin triangleBin);
110 simgear::Effect* get_effect();
113 * Get the textured state.
115 osg::Texture2D* get_object_mask(SGTexturedTriangleBin triangleBin);
119 * Get the number of textures assigned to this material.
121 inline int get_num() const { return _status.size(); }
125 * Get the xsize of the texture, in meters.
127 inline double get_xsize() const { return xsize; }
131 * Get the ysize of the texture, in meters.
133 inline double get_ysize() const { return ysize; }
137 * Get the light coverage.
139 * A smaller number means more generated night lighting.
141 * @return The area (m^2) covered by each light.
143 inline double get_light_coverage () const { return light_coverage; }
146 * Get the wood coverage.
148 * A smaller number means more generated woods within the forest.
150 * @return The area (m^2) covered by each wood.
152 inline double get_wood_coverage () const { return wood_coverage; }
155 * Get the tree height.
157 * @return The average height of the trees.
159 inline double get_tree_height () const { return tree_height; }
162 * Get the tree width.
164 * @return The average width of the trees.
166 inline double get_tree_width () const { return tree_width; }
169 * Get the forest LoD range.
171 * @return The LoD range for the trees.
173 inline double get_tree_range () const { return tree_range; }
176 * Get the number of tree varieties available
178 * @return the number of different trees defined in the texture strip
180 inline int get_tree_varieties () const { return tree_varieties; }
183 * Get the texture strip to use for trees
185 * @return the texture to use for trees.
187 inline std::string get_tree_texture () const { return tree_texture; }
190 * Return if the surface material is solid, if it is not solid, a fluid
191 * can be assumed, that is usually water.
193 bool get_solid () const { return solid; }
196 * Get the friction factor for that material
198 double get_friction_factor () const { return friction_factor; }
201 * Get the rolling friction for that material
203 double get_rolling_friction () const { return rolling_friction; }
206 * Get the bumpines for that material
208 double get_bumpiness () const { return bumpiness; }
211 * Get the load resistance
213 double get_load_resistance () const { return load_resistance; }
216 * Get the list of names for this material
218 const std::vector<std::string>& get_names() const { return _names; }
221 * add the given name to the list of names this material is known
223 void add_name(const std::string& name) { _names.push_back(name); }
226 * Get the number of randomly-placed objects defined for this material.
228 int get_object_group_count () const { return object_groups.size(); }
231 * Get a randomly-placed object for this material.
233 SGMatModelGroup * get_object_group (int index) const {
234 return object_groups[index];
238 * Return pointer to glyph class, or 0 if it doesn't exist.
240 SGMaterialGlyph * get_glyph (const std::string& name) const;
242 void set_light_color(const SGVec4f& color)
243 { emission = color; }
244 const SGVec4f& get_light_color() const
247 SGVec2f get_tex_coord_scale() const
249 float tex_width = get_xsize();
250 float tex_height = get_ysize();
252 return SGVec2f((0 < tex_width) ? 1000.0f/tex_width : 1.0f,
253 (0 < tex_height) ? 1000.0f/tex_height : 1.0f);
259 ////////////////////////////////////////////////////////////////////
260 // Protected methods.
261 ////////////////////////////////////////////////////////////////////
264 * Initialization method, invoked by all public constructors.
270 struct _internal_state {
271 _internal_state(simgear::Effect *e, bool l,
272 const simgear::SGReaderWriterOptions *o);
273 _internal_state(simgear::Effect *e, const std::string &t, bool l,
274 const simgear::SGReaderWriterOptions *o);
275 void add_texture(const std::string &t, int i);
276 osg::ref_ptr<simgear::Effect> effect;
277 std::vector<std::pair<std::string,int> > texture_paths;
278 bool effect_realized;
279 osg::ref_ptr<const simgear::SGReaderWriterOptions> options;
285 ////////////////////////////////////////////////////////////////////
287 ////////////////////////////////////////////////////////////////////
290 std::vector<_internal_state> _status;
301 // coverage of night lighting.
302 double light_coverage;
305 double wood_coverage;
307 // Range at which trees become visible
310 // Height of the tree
316 // Number of varieties of tree texture
319 // True if the material is solid, false if it is a fluid
322 // the friction factor of that surface material
323 double friction_factor;
325 // the rolling friction of that surface material
326 double rolling_friction;
328 // the bumpiness of that surface material
331 // the load resistance of that surface material
332 double load_resistance;
334 // material properties
335 SGVec4f ambient, diffuse, specular, emission;
338 // effect for this material
341 // the list of names for this material. May be empty.
342 std::vector<std::string> _names;
344 std::vector<SGSharedPtr<SGMatModelGroup> > object_groups;
346 // taxiway-/runway-sign texture elements
347 std::map<std::string, SGSharedPtr<SGMaterialGlyph> > glyphs;
349 // Tree texture, typically a strip of applicable tree textures
350 std::string tree_texture;
352 // Object mask, a simple RGB texture used as a mask when placing
353 // random vegetation, objects and buildings
354 std::vector<osg::Texture2D*> _masks;
356 ////////////////////////////////////////////////////////////////////
357 // Internal constructors and methods.
358 ////////////////////////////////////////////////////////////////////
360 void read_properties(const simgear::SGReaderWriterOptions* options,
361 const SGPropertyNode *props);
362 void buildEffectProperties(const simgear::SGReaderWriterOptions* options);
363 simgear::Effect* get_effect(int i);
367 class SGMaterialGlyph : public SGReferenced {
369 SGMaterialGlyph(SGPropertyNode *);
370 inline double get_left() const { return _left; }
371 inline double get_right() const { return _right; }
372 inline double get_width() const { return _right - _left; }
379 class SGMaterialUserData : public osg::Referenced {
381 SGMaterialUserData(const SGMaterial* material) :
384 const SGMaterial* getMaterial() const
385 { return mMaterial; }
387 // this cannot be an SGSharedPtr since that would create a cicrular reference
388 // making it impossible to ever free the space needed by SGMaterial
389 const SGMaterial* mMaterial;
393 SGSetTextureFilter( int max);
396 SGGetTextureFilter();
398 #endif // _SG_MAT_HXX