78 lines
2.3 KiB
C++
78 lines
2.3 KiB
C++
/* -*-c++-*-
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*
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* Copyright (C) 2006-2007 Mathias Froehlich
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of the
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* License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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* MA 02110-1301, USA.
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*
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*/
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#ifndef SG_DIRECTIONAL_LIGHT_BIN_HXX
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#define SG_DIRECTIONAL_LIGHT_BIN_HXX
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class SGDirectionalLightBin {
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public:
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struct Light {
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Light(const SGVec3f& p, const SGVec3f& n, const SGVec4f& c) :
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position(p), normal(n), color(c)
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{ }
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SGVec3f position;
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SGVec3f normal;
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SGVec4f color;
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};
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typedef std::vector<Light> LightList;
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void insert(const Light& light)
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{ _lights.push_back(light); }
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void insert(const SGVec3f& p, const SGVec3f& n, const SGVec4f& c)
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{ insert(Light(p, n, c)); }
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unsigned getNumLights() const
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{ return _lights.size(); }
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const Light& getLight(unsigned i) const
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{ return _lights[i]; }
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// helper for sorting lights back to front ...
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struct DirectionLess {
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DirectionLess(const SGVec3f& direction) :
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_direction(direction)
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{ }
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inline bool operator() (const Light& l, const Light& r) const
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{ return dot(_direction, l.position) < dot(_direction, r.position); }
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private:
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SGVec3f _direction;
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};
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typedef std::multiset<Light,DirectionLess> LightSet;
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LightList getSortedLights(const SGVec3f& sortDirection) const
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{
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LightSet lightSet = LightSet(DirectionLess(sortDirection));
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for (unsigned i = 0; i < _lights.size(); ++i)
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lightSet.insert(_lights[i]);
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LightList sortedLights;
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sortedLights.reserve(_lights.size());
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for (LightSet::const_iterator i = lightSet.begin(); i != lightSet.end(); ++i)
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sortedLights.push_back(*i);
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return sortedLights;
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}
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private:
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LightList _lights;
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};
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#endif
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