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use own inline hash_combine function

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Bret Curtis 2017-06-10 23:02:56 +02:00
parent fb7479c194
commit f0b21cca22
1 changed files with 10 additions and 2 deletions
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12
components/sceneutil/lightmanager.cpp
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@ -209,13 +209,21 @@ namespace SceneUtil
mLights.push_back(l); mLights.push_back(l);
} }
/* similar to the boost::hash_combine */
template <class T>
inline void hash_combine(std::size_t& seed, const T& v)
{
std::hash<T> hasher;
seed ^= hasher(v) + 0x9e3779b9 + (seed<<6) + (seed>>2);
}
osg::ref_ptr<osg::StateSet> LightManager::getLightListStateSet(const LightList &lightList, unsigned int frameNum) osg::ref_ptr<osg::StateSet> LightManager::getLightListStateSet(const LightList &lightList, unsigned int frameNum)
{ {
// possible optimization: return a StateSet containing all requested lights plus some extra lights (if a suitable one exists) // possible optimization: return a StateSet containing all requested lights plus some extra lights (if a suitable one exists)
size_t hash = 0; size_t hash = 0;
for (unsigned int i=0; i<lightList.size();++i) for (unsigned int i=0; i<lightList.size();++i)
hash = hash ^ (lightList[i]->mLightSource->getId() << 1); // or use boost::hash_combine hash_combine(hash, lightList[i]->mLightSource->getId());
// original: boost::hash_combine(hash, lightList[i]->mLightSource->getId());
LightStateSetMap& stateSetCache = mStateSetCache[frameNum%2]; LightStateSetMap& stateSetCache = mStateSetCache[frameNum%2];