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Add specialized DisableLight state attribute for more efficient undoing of light state

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Seems to reduce # of GL calls by 10-15% in a typical scene.
This commit is contained in:
scrawl 2017-02-07 23:01:36 +01:00
parent cdca9b0488
commit 4d4dc1b9c1
1 changed files with 43 additions and 5 deletions
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48
components/sceneutil/lightmanager.cpp
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@ -262,18 +262,56 @@ namespace SceneUtil
return it->second;
}
class DisableLight : public osg::StateAttribute
{
public:
DisableLight() : mIndex(0) {}
DisableLight(int index) : mIndex(index) {}
DisableLight(const DisableLight& copy,const osg::CopyOp& copyop=osg::CopyOp::SHALLOW_COPY)
: osg::StateAttribute(copy,copyop), mIndex(copy.mIndex) {}
unsigned int getMember() const
{
return mIndex;
}
virtual bool getModeUsage(ModeUsage & usage) const
{
usage.usesMode(GL_LIGHT0 + mIndex);
return true;
}
virtual int compare(const StateAttribute &sa) const
{
throw std::runtime_error("DisableLight::compare: unimplemented");
}
META_StateAttribute(SceneUtil, DisableLight, osg::StateAttribute::LIGHT)
virtual void apply(osg::State&) const
{
int lightNum = GL_LIGHT0 + mIndex;
glLightfv( lightNum, GL_AMBIENT, mNull.ptr() );
glLightfv( lightNum, GL_DIFFUSE, mNull.ptr() );
glLightfv( lightNum, GL_SPECULAR, mNull.ptr() );
}
private:
unsigned int mIndex;
osg::Vec4f mNull;
};
void LightManager::setStartLight(int start)
{
mStartLight = start;
// Set default light state to zero
// This is necessary because shaders don't respect glDisable(GL_LIGHTX) so in addition to disabling
// we'll have to set a light state that has no visible effect
for (int i=start; i<8; ++i)
{
osg::ref_ptr<osg::Light> defaultLight (new osg::Light(i));
defaultLight->setAmbient(osg::Vec4());
defaultLight->setDiffuse(osg::Vec4());
defaultLight->setSpecular(osg::Vec4());
defaultLight->setConstantAttenuation(0.f);
osg::ref_ptr<DisableLight> defaultLight (new DisableLight(i));
getOrCreateStateSet()->setAttributeAndModes(defaultLight, osg::StateAttribute::OFF);
}
}