source: GTP/trunk/App/Demos/Vis/FriendlyCulling/src/StopAndWaitTraverser.cpp @ 2800

#include "StopAndWaitTraverser.h"
#include "SceneEntity.h"


namespace CHCDemoEngine
{

using namespace std;



StopAndWaitTraverser::StopAndWaitTraverser()
{
}


void StopAndWaitTraverser::Traverse()
{
        while (!mDistanceQueue.empty())
        {
                BvhNode *node = mDistanceQueue.top();
                mDistanceQueue.pop();
        
                if (mBvh->IsWithinViewFrustum(node))
                {
                        // if intersects near plane assume visible and don't issue test
                        if (IntersectsNearPlane(node))
                        {
                                TraverseNode(node);
                        }
                        else
                        {
                                OcclusionQuery *query = IssueOcclusionQuery(node);

                                waitTimer.Entry();
                                bool visible = query->GetQueryResult() > mVisibilityThreshold;
                                waitTimer.Exit();

                                if (visible)
                                {
                                        TraverseNode(node);
                                }
                                else
                                {
                                        node->SetVisible(false);
                                        ++ mStats.mNumQueryCulledNodes;
                                }
                                
                                // update node's visited flag (could be interesting for the visualization)
                                node->SetVisible(visible);              
                        }
                }
                else
                {
                        ++ mStats.mNumFrustumCulledNodes;
                }       
        }
}

}