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OgreD3D9HardwareOcclusionQuery.h

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00001 /*
00002 -----------------------------------------------------------------------------
00003 This source file is part of OGRE
00004     (Object-oriented Graphics Rendering Engine)
00005 For the latest info, see http://ogre.sourceforge.net/
00006 
00007 Copyright © 2000-2003 The OGRE Team
00008 Also see acknowledgements in Readme.html
00009 
00010 This program is free software; you can redistribute it and/or modify it under
00011 the terms of the GNU Lesser General Public License as published by the Free Software
00012 Foundation; either version 2 of the License, or (at your option) any later
00013 version.
00014 
00015 This program is distributed in the hope that it will be useful, but WITHOUT
00016 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
00017 FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.
00018 
00019 You should have received a copy of the GNU Lesser General Public License along with
00020 this program; if not, write to the Free Software Foundation, Inc., 59 Temple
00021 Place - Suite 330, Boston, MA 02111-1307, USA, or go to
00022 http://www.gnu.org/copyleft/lesser.txt.
00023 -----------------------------------------------------------------------------
00024 */
00025 
00026 #ifndef _D3D9HARWAREOCCLUSIONQUERY_H__
00027 #define _D3D9HARWAREOCCLUSIONQUERY_H__
00028 
00029 #include "OgreD3D9Prerequisites.h"
00030 #include "OgreHardwareOcclusionQuery.h"
00031 
00032 
00033 namespace Ogre {
00034 
00035 
00036 
00037 // If you use multiple rendering passes you can test only the first pass and all other passes don't have to be rendered 
00038 // if the first pass resultet has too few pixels visable.
00039 
00040 // Be sure to render all occlluder first and whats out so the RenderQue don't switch places on 
00041 // the occluding objects and the tested objects because it thinks it's more effective..
00042 
00049 class D3D9HardwareOcclusionQuery : public HardwareOcclusionQuery
00050 {
00051 //----------------------------------------------------------------------
00052 // Public methods
00053 //--
00054 public:
00055 
00060     D3D9HardwareOcclusionQuery( IDirect3DDevice9* pD3DDevice );
00061 
00065     ~D3D9HardwareOcclusionQuery();
00066 
00067     //------------------------------------------------------------------
00068     // Occlusion query functions (see base class documentation for this)
00069     //--
00070 
00071     void beginOcclusionQuery(); 
00072     void endOcclusionQuery();
00073     bool pullOcclusionQuery( unsigned int* NumOfFragments);
00074     bool pullOcclusionQuery( unsigned int* NumOfFragments, const HW_OCCLUSIONQUERY flag  );
00075     unsigned int getLastQuerysPixelcount() { return m_uintPixelCount; }
00076 
00077     // This functions are optional, it's a simple filter that simply skipps some hardware occlusion tests on visable objects only
00078     // It's easy to use if you don't have to keep track on which objects are visable (can be skipped) and what objects arn't visable..
00079     // (None visable objects and object you introduce for the first time have allways to be tested allthough the cheepest possible 
00080     // LOD (Level Of Detail) mesh and material wize). 
00081 
00093     void setSkipRate( int skip ) { m_Skip = skip; }         // Using 2 only 50 % of the tests are actully made and 3 results in only 33% of the tests. So on.
00094     int  getSkipRate() { return m_Skip; } 
00095 
00096 //----------------------------------------------------------------------
00097 // Protected members
00098 //--
00099 protected:
00100 
00101     unsigned int        m_uintPixelCount;       
00102     IDirect3DQuery9*    m_pD3DQuery;
00103     IDirect3DDevice9*   m_pD3DDevice;       // d3d device
00104     bool                m_bOcclusionQuery;
00105     int                 m_SkipCounter;      // m_SkipConter =  m_SkipConter % m_Skip; if ( m_SkipConter == 0 && m_uintPixelCount !=0 ) TestHWOcclusion else just return 
00106     static int          m_Skip;             // This is shared by all instancies
00107     bool                m_bHWOcclusionSupport;
00108 };
00109 
00110 
00111 }
00112 
00113 
00114 #endif

Copyright © 2002-2003 by The OGRE Team
Last modified Fri May 14 23:22:02 2004