#include "OgrePlatformOcclusionQuery.h"
#include <OgreLogManager.h>

namespace Ogre {

//-----------------------------------------------------------------------
PlatformOcclusionQuery::PlatformOcclusionQuery(RenderSystem *rsys)
{
	mHardwareOcclusionQuery = rsys->createHardwareOcclusionQuery();
}
//-----------------------------------------------------------------------
PlatformOcclusionQuery::~PlatformOcclusionQuery()
{
	// hardwareocclusion query is deleted by Ogre
	//delete mHardwareOcclusionQuery;
}
//-----------------------------------------------------------------------
void PlatformOcclusionQuery::BeginQuery()
{
	mHardwareOcclusionQuery->beginOcclusionQuery();
}
//-----------------------------------------------------------------------
void PlatformOcclusionQuery::EndQuery()
{
	mHardwareOcclusionQuery->endOcclusionQuery();
}
//-----------------------------------------------------------------------
bool PlatformOcclusionQuery::GetQueryResult(unsigned int &visiblePixels, 
											const bool waitForResult) const
{
	// return mHardwareOcclusionQuery->pullOcclusionQuery(&visiblePixels, waitForResult);

	bool isAvailable = true;

	if (!waitForResult)
	{
		isAvailable = !mHardwareOcclusionQuery->isStillOutstanding();
	}

//std::stringstream d; d << mHardwareOcclusionQuery << ", available: " << isAvailable << ", waitforresult: " << waitForResult;
//		Ogre::LogManager::getSingleton().logMessage(d.str());

	if (isAvailable)
		return mHardwareOcclusionQuery->pullOcclusionQuery(&visiblePixels);
	
	return false;
}

} // namespace Ogre