1 // matlib.hxx -- class to handle material properties
3 // Written by Curtis Olson, started May 1998.
5 // Copyright (C) 1998 - 2000 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 <simgear/structure/SGSharedPtr.hxx>
33 #include <string> // Standard C++ string library
34 #include <map> // STL associative "array"
35 #include <vector> // STL "array"
40 namespace simgear { class Effect; }
41 namespace osg { class Geode; }
43 // Material management class
48 std::auto_ptr<MatLibPrivate> d;
50 // associative array of materials
51 typedef std::vector< SGSharedPtr<SGMaterial> > material_list;
52 typedef material_list::iterator material_list_iterator;
54 typedef std::map < std::string, material_list> material_map;
55 typedef material_map::iterator material_map_iterator;
56 typedef material_map::const_iterator const_material_map_iterator;
60 typedef std::map < std::string, SGSharedPtr<SGMaterial> > active_material_cache;
61 active_material_cache active_cache;
66 SGMaterialLib ( void );
68 // Load a library of material properties
69 bool load( const std::string &fg_root, const std::string& mpath,
70 SGPropertyNode *prop_root );
71 // find a material record by material name
72 SGMaterial *find( const std::string& material ) const;
75 * Material lookup involves evaluation of SGConditions to determine which
76 * possible material (by season, region, etc) is valid. This involves
77 * vproperty tree queries, so repeated calls to find() can cause
78 * race conditions when called from the osgDB pager thread. (especially
81 * To fix this, and also avoid repeated re-evaluation of the material
82 * conditions, we provide a version which uses a cached, threadsafe table
83 * of the currently valid materials. The main thread calls the refresh
84 * method below to evaluate the valid materials, and findCached can be
85 * safely called from other threads with no access to unprotected state.
87 SGMaterial *findCached( const std::string& material ) const;
88 void refreshActiveMaterials();
90 material_map_iterator begin() { return matlib.begin(); }
91 const_material_map_iterator begin() const { return matlib.begin(); }
93 material_map_iterator end() { return matlib.end(); }
94 const_material_map_iterator end() const { return matlib.end(); }
96 static const SGMaterial *findMaterial(const osg::Geode* geode);
99 ~SGMaterialLib ( void );
103 #endif // _MATLIB_HXX