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Merge pull request #2298 from akortunov/optimize

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Do not allocate eight dummy LightStateAttribute's for every stateset
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Alexei Dobrohotov 2019-05-11 02:32:34 +03:00 committed by GitHub
commit 1444ef6f43
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2 changed files with 8 additions and 10 deletions
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16
components/sceneutil/lightmanager.cpp
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@ -165,6 +165,8 @@ namespace SceneUtil
, mLightingMask(~0u)
{
setUpdateCallback(new LightManagerUpdateCallback);
for (unsigned int i=0; i<8; ++i)
mDummies.push_back(new LightStateAttribute(i, std::vector<osg::ref_ptr<osg::Light> >()));
}
LightManager::LightManager(const LightManager &copy, const osg::CopyOp &copyop)
@ -219,7 +221,6 @@ namespace SceneUtil
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)
size_t hash = 0;
for (unsigned int i=0; i<lightList.size();++i)
@ -236,27 +237,22 @@ namespace SceneUtil
std::vector<osg::ref_ptr<osg::Light> > lights;
lights.reserve(lightList.size());
for (unsigned int i=0; i<lightList.size();++i)
{
lights.push_back(lightList[i]->mLightSource->getLight(frameNum));
}
// the first light state attribute handles the actual state setting for all lights
// it's best to batch these up so that we don't need to touch the modelView matrix more than necessary
osg::ref_ptr<LightStateAttribute> attr = new LightStateAttribute(mStartLight, lights);
// don't use setAttributeAndModes, that does not support light indices!
stateset->setAttribute(attr, osg::StateAttribute::ON);
stateset->setAttribute(new LightStateAttribute(mStartLight, std::move(lights)), osg::StateAttribute::ON);
for (unsigned int i=0; i<lightList.size(); ++i)
stateset->setMode(GL_LIGHT0 + mStartLight + i, osg::StateAttribute::ON);
// need to push some dummy attributes to ensure proper state tracking
// lights need to reset to their default when the StateSet is popped
for (unsigned int i=1; i<lightList.size(); ++i)
{
osg::ref_ptr<LightStateAttribute> dummy = new LightStateAttribute(mStartLight+i, std::vector<osg::ref_ptr<osg::Light> >());
stateset->setAttribute(dummy, osg::StateAttribute::ON);
}
stateset->setAttribute(mDummies[i+mStartLight].get(), osg::StateAttribute::ON);
stateSetCache.insert(std::make_pair(hash, stateset));
stateSetCache.emplace(hash, stateset);
return stateset;
}
}

2
components/sceneutil/lightmanager.hpp
View file

@ -140,6 +140,8 @@ namespace SceneUtil
typedef std::map<size_t, osg::ref_ptr<osg::StateSet> > LightStateSetMap;
LightStateSetMap mStateSetCache[2];
std::vector<osg::ref_ptr<osg::StateAttribute>> mDummies;
int mStartLight;
unsigned int mLightingMask;