Ogre::HardwareOcclusionQuery Class Reference

This is a abstract class that that provides the interface for the query class for hardware occlusion. More...

#include <OgreHardwareOcclusionQuery.h>

Inheritance diagram for Ogre::HardwareOcclusionQuery:

Public Member Functions
	HardwareOcclusionQuery ()
	Object public member functions. More...
virtual	~HardwareOcclusionQuery ()
	Object destructor. More...
virtual void	beginOcclusionQuery ()=0
	Starts the hardware occlusion query. More...
virtual void	endOcclusionQuery ()=0
	Ends the hardware occlusion test. More...
unsigned int	getLastQuerysPixelcount () const
	Let's you get the last pixel count with out doing the hardware occlusion test. More...
virtual bool	isStillOutstanding (void)=0
	Lets you know when query is done, or still be processed by the Hardware. More...
virtual bool	pullOcclusionQuery (unsigned int *NumOfFragments)=0
	Pulls the hardware occlusion query. More...

Detailed Description

This is a abstract class that that provides the interface for the query class for hardware occlusion.

Author

Lee Sandberg Updated on 13/8/2005 by Tuan Kuranes email: tuan..nosp@m.kura.nosp@m.nes@f.nosp@m.ree..nosp@m.fr

Constructor & Destructor Documentation

HardwareOcclusionQuery()

Ogre::HardwareOcclusionQuery::HardwareOcclusionQuery

(

)

Object public member functions.

Default object constructor

~HardwareOcclusionQuery()

virtual Ogre::HardwareOcclusionQuery::~HardwareOcclusionQuery ( )

virtual

Object destructor.

Member Function Documentation

beginOcclusionQuery()

virtual void Ogre::HardwareOcclusionQuery::beginOcclusionQuery ( )

pure virtual

Starts the hardware occlusion query.

Remarks

Simple usage: Create one or more OcclusionQuery object one per outstanding query or one per tested object OcclusionQuery* mOcclusionQuery; createOcclusionQuery( &mOcclusionQuery ); In the rendering loop: Draw all occluders mOcclusionQuery->startOcclusionQuery(); Draw the polygons to be tested mOcclusionQuery->endOcclusionQuery();

Results must be pulled using: UINT mNumberOfPixelsVisable; pullOcclusionQuery( &mNumberOfPixelsVisable );

Implemented in Ogre::GLHardwareOcclusionQuery, Ogre::GL3PlusHardwareOcclusionQuery, Ogre::D3D9HardwareOcclusionQuery, Ogre::D3D11HardwareOcclusionQuery, and Ogre::GLES2HardwareOcclusionQuery.

endOcclusionQuery()

virtual void Ogre::HardwareOcclusionQuery::endOcclusionQuery ( )

pure virtual

Ends the hardware occlusion test.

Implemented in Ogre::GLHardwareOcclusionQuery, Ogre::GL3PlusHardwareOcclusionQuery, Ogre::D3D9HardwareOcclusionQuery, Ogre::D3D11HardwareOcclusionQuery, and Ogre::GLES2HardwareOcclusionQuery.

pullOcclusionQuery()

virtual bool Ogre::HardwareOcclusionQuery::pullOcclusionQuery ( unsigned int *  NumOfFragments )

pure virtual

Pulls the hardware occlusion query.

Note

Waits until the query result is available; use isStillOutstanding if just want to test if the result is available.

Return values

NumOfFragments

will get the resulting number of fragments.

Returns

True if success or false if not.

Implemented in Ogre::GLHardwareOcclusionQuery, Ogre::GL3PlusHardwareOcclusionQuery, Ogre::D3D9HardwareOcclusionQuery, Ogre::D3D11HardwareOcclusionQuery, and Ogre::GLES2HardwareOcclusionQuery.

getLastQuerysPixelcount()

unsigned int Ogre::HardwareOcclusionQuery::getLastQuerysPixelcount ( ) const

inline

Let's you get the last pixel count with out doing the hardware occlusion test.

Returns

The last fragment count from the last test. Remarks This function won't give you new values, just the old value.

isStillOutstanding()

virtual bool Ogre::HardwareOcclusionQuery::isStillOutstanding ( void  )

pure virtual

Lets you know when query is done, or still be processed by the Hardware.

Returns

true if query isn't finished.

Implemented in Ogre::GLHardwareOcclusionQuery, Ogre::GL3PlusHardwareOcclusionQuery, Ogre::D3D9HardwareOcclusionQuery, Ogre::D3D11HardwareOcclusionQuery, and Ogre::GLES2HardwareOcclusionQuery.

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The documentation for this class was generated from the following file:

• OgreHardwareOcclusionQuery.h