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Add LightStateCache to avoid redundantly setting the same gl_Light

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Normally, osg::State would do this for us (via lastAppliedAttribute), but since we're using a custom StateAttribute to apply all lights at once, we have to track ourselves.

Further reduction of GL calls in a typical scene by ~2%
This commit is contained in:
scrawl 2017-02-07 23:36:02 +01:00
parent 4d4dc1b9c1
commit c00532d82d
1 changed files with 28 additions and 2 deletions
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30
components/sceneutil/lightmanager.cpp
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@ -13,6 +13,20 @@
namespace SceneUtil namespace SceneUtil
{ {
class LightStateCache
{
public:
osg::Light* lastAppliedLight[8];
};
LightStateCache* getLightStateCache(unsigned int contextid)
{
static std::vector<LightStateCache> cacheVector;
if (cacheVector.size() < contextid+1)
cacheVector.resize(contextid+1);
return &cacheVector[contextid];
}
// Resets the modelview matrix to just the view matrix before applying lights. // Resets the modelview matrix to just the view matrix before applying lights.
class LightStateAttribute : public osg::StateAttribute class LightStateAttribute : public osg::StateAttribute
{ {
@ -50,8 +64,17 @@ namespace SceneUtil
state.applyModelViewMatrix(state.getInitialViewMatrix()); state.applyModelViewMatrix(state.getInitialViewMatrix());
LightStateCache* cache = getLightStateCache(state.getContextID());
for (unsigned int i=0; i<mLights.size(); ++i) for (unsigned int i=0; i<mLights.size(); ++i)
applyLight((GLenum)((int)GL_LIGHT0 + i + mIndex), mLights[i].get()); {
osg::Light* current = cache->lastAppliedLight[i+mIndex];
if (current != mLights[i].get())
{
applyLight((GLenum)((int)GL_LIGHT0 + i + mIndex), mLights[i].get());
cache->lastAppliedLight[i+mIndex] = mLights[i].get();
}
}
state.applyModelViewMatrix(modelViewMatrix); state.applyModelViewMatrix(modelViewMatrix);
} }
@ -289,12 +312,15 @@ namespace SceneUtil
META_StateAttribute(SceneUtil, DisableLight, osg::StateAttribute::LIGHT) META_StateAttribute(SceneUtil, DisableLight, osg::StateAttribute::LIGHT)
virtual void apply(osg::State&) const virtual void apply(osg::State& state) const
{ {
int lightNum = GL_LIGHT0 + mIndex; int lightNum = GL_LIGHT0 + mIndex;
glLightfv( lightNum, GL_AMBIENT, mNull.ptr() ); glLightfv( lightNum, GL_AMBIENT, mNull.ptr() );
glLightfv( lightNum, GL_DIFFUSE, mNull.ptr() ); glLightfv( lightNum, GL_DIFFUSE, mNull.ptr() );
glLightfv( lightNum, GL_SPECULAR, mNull.ptr() ); glLightfv( lightNum, GL_SPECULAR, mNull.ptr() );
LightStateCache* cache = getLightStateCache(state.getContextID());
cache->lastAppliedLight[mIndex] = NULL;
} }
private: private: