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Improve occlusion query geometry rendering

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This commit is contained in:
scrawl 2016-03-11 00:09:30 +01:00
parent 93ec289b1d
commit 85bd4f52f0
1 changed files with 18 additions and 18 deletions
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36
apps/openmw/mwrender/sky.cpp
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@ -537,6 +537,12 @@ public:
}
private:
class DummyComputeBoundCallback : public osg::Node::ComputeBoundingSphereCallback
{
public:
virtual osg::BoundingSphere computeBound(const osg::Node& node) const { return osg::BoundingSphere(); }
};
/// @param queryVisible If true, queries the amount of visible pixels. If false, queries the total amount of pixels.
osg::ref_ptr<osg::OcclusionQueryNode> createOcclusionQueryNode(osg::Group* parent, bool queryVisible)
{
@ -549,25 +555,19 @@ private:
// Note the debug geometry setDebugDisplay(true) is always DYNAMIC and that can't be changed, not a big deal.
oqn->getQueryGeometry()->setDataVariance(osg::Object::STATIC);
osg::ref_ptr<osg::Geometry> queryGeom = osg::clone(mGeom.get(), osg::CopyOp::DEEP_COPY_ALL);
oqn->addChild(queryGeom);
// Set up the query geometry to match the actual sun's rendering shape. osg::OcclusionQueryNode wasn't originally intended to allow this,
// normally it would automatically adjust the query geometry to match the sub graph's bounding box. The below hack is needed to
// circumvent this.
osg::Geometry* queryGeom = oqn->getQueryGeometry();
queryGeom->setVertexArray(mGeom->getVertexArray());
queryGeom->setTexCoordArray(0, mGeom->getTexCoordArray(0), osg::Array::BIND_PER_VERTEX);
queryGeom->removePrimitiveSet(0, oqn->getQueryGeometry()->getNumPrimitiveSets());
queryGeom->addPrimitiveSet(mGeom->getPrimitiveSet(0));
// Need to add texture coordinates so that texturing works. A bit ugly, relies on the vertex ordering
// used within OcclusionQueryNode.
osg::ref_ptr<osg::Vec2Array> texCoordArray (new osg::Vec2Array);
for (int i=0; i<8; ++i)
{
texCoordArray->push_back(osg::Vec2(0,0));
texCoordArray->push_back(osg::Vec2(1,0));
texCoordArray->push_back(osg::Vec2(0,0));
texCoordArray->push_back(osg::Vec2(1,0));
texCoordArray->push_back(osg::Vec2(1,1));
texCoordArray->push_back(osg::Vec2(0,1));
texCoordArray->push_back(osg::Vec2(0,1));
texCoordArray->push_back(osg::Vec2(1,1));
}
oqn->getQueryGeometry()->setTexCoordArray(0, texCoordArray, osg::Array::BIND_PER_VERTEX);
// Hack to disable unwanted awful code inside OcclusionQueryNode::computeBound.
oqn->setComputeBoundingSphereCallback(new DummyComputeBoundCallback);
// Still need a proper bounding sphere.
oqn->setInitialBound(queryGeom->getBound());
osg::StateSet* queryStateSet = new osg::StateSet;
if (queryVisible)