#include "StopAndWaitCullingManager.h"
#include <windows.h>

namespace GtpVisibility {

//-----------------------------------------------------------------------
void StopAndWaitCullingManager::RenderScene()
{
	mNumFrustumCulledNodes = mNumQueryCulledNodes = 0;
	//OutputDebugString("Stop and Wait Culling\n");

	while (!mHierarchyInterface->GetQueue()->empty())
	{
		HierarchyNode *node = mHierarchyInterface->GetQueue()->top();
		mHierarchyInterface->GetQueue()->pop();
		
		// interesting for visualization purpose
		mHierarchyInterface->SetNodeVisible(node, false);
		mHierarchyInterface->SetLastVisited(node, mHierarchyInterface->GetFrameId());

		bool intersects = false;

		if (!mHierarchyInterface->CheckFrustumVisible(node, intersects))
		{
			mNumFrustumCulledNodes ++;
		}
		else
		{
			//if intersects near plane => skip occlusion query because wrong results possible
			if (intersects)
			{
	            mHierarchyInterface->SetNodeVisible(node, true);
				mHierarchyInterface->TraverseNode(node);
				continue;
			}

			unsigned int visiblePixels = 0;

			mHierarchyInterface->IssueOcclusionQuery(node)->GetQueryResult(visiblePixels, true);

			// node visible
			if (visiblePixels > mVisibilityThreshold)
			{
				mHierarchyInterface->TraverseNode(node);
			}
			else
			{
				mNumQueryCulledNodes ++;
			}
		}
	}
}
} // namespace GtpVisibility