3 * Copyright (C) 2006-2007 Mathias Froehlich
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU General Public License as
7 * published by the Free Software Foundation; either version 2 of the
8 * License, or (at your option) any later version.
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License for more details.
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
22 #ifndef SG_DIRECTIONAL_LIGHT_BIN_HXX
23 #define SG_DIRECTIONAL_LIGHT_BIN_HXX
25 class SGDirectionalLightBin {
28 Light(const SGVec3f& p, const SGVec3f& n, const SGVec4f& c) :
29 position(p), normal(n), color(c)
35 typedef std::vector<Light> LightList;
37 void insert(const Light& light)
38 { _lights.push_back(light); }
39 void insert(const SGVec3f& p, const SGVec3f& n, const SGVec4f& c)
40 { insert(Light(p, n, c)); }
42 unsigned getNumLights() const
43 { return _lights.size(); }
44 const Light& getLight(unsigned i) const
45 { return _lights[i]; }
47 // helper for sorting lights back to front ...
48 struct DirectionLess {
49 DirectionLess(const SGVec3f& direction) :
52 inline bool operator() (const Light& l, const Light& r) const
53 { return dot(_direction, l.position) < dot(_direction, r.position); }
57 typedef std::multiset<Light,DirectionLess> LightSet;
59 LightList getSortedLights(const SGVec3f& sortDirection) const
61 LightSet lightSet = LightSet(DirectionLess(sortDirection));
62 for (unsigned i = 0; i < _lights.size(); ++i)
63 lightSet.insert(_lights[i]);
65 LightList sortedLights;
66 sortedLights.reserve(_lights.size());
67 for (LightSet::const_iterator i = lightSet.begin(); i != lightSet.end(); ++i)
68 sortedLights.push_back(*i);