OgreGLHardwareOcclusionQuery.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://www.ogre3d.org
    00006
    00007 Copyright (c) 2000-2012 Torus Knot Software Ltd
    00008
    00009 Permission is hereby granted, free of charge, to any person obtaining a copy
    00010 of this software and associated documentation files (the "Software"), to deal
    00011 in the Software without restriction, including without limitation the rights
    00012 to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
    00013 copies of the Software, and to permit persons to whom the Software is
    00014 furnished to do so, subject to the following conditions:
    00015
    00016 The above copyright notice and this permission notice shall be included in
    00017 all copies or substantial portions of the Software.
    00018
    00019 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
    00020 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
    00021 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
    00022 AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
    00023 LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
    00024 OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
    00025 THE SOFTWARE.
    00026 -----------------------------------------------------------------------------
    00027 */
    00028
    00029 /*
    00030 The nVidia occlusion query extension is defined in glext.h so you don't
    00031 need anything else. You do need to look up the function, we provide a
    00032 GLSupport class to do this, which has platform implementations for
    00033 getProcAddress. Check the way that extensions like glActiveTextureARB are
    00034 initialised and used in glRenderSystem and copy what is done there.
    00035
    00036
    00037
    00038   To do: fix so dx7 and DX9 checks and flags if HW Occlusion is supported
    00039   See the openGl dito for ideas what to do.
    00040
    00041 */
    00042
    00043
    00044
    00045 //GL_ActiveTextureARB_Func* glActiveTextureARB_ptr = (GL_ActiveTextureARB_Func)mGLSupport->getProcAddress("glActiveTextureARB");
    00046
    00047 #ifndef __GLHARDWAREOCCLUSIONQUERY_H__
    00048 #define __GLHARDWAREOCCLUSIONQUERY_H__
    00049
    00050 #include "OgreGLPrerequisites.h"
    00051 #include "OgreHardwareOcclusionQuery.h"
    00052
    00053
    00054 namespace Ogre {
    00055
    00056
    00057 // If you use multiple rendering passes you can test only the first pass and all other passes don't have to be rendered
    00058 // if the first pass result has too few pixels visible.
    00059
    00060 // Be sure to render all occluder first and whats out so the RenderQue don't switch places on
    00061 // the occluding objects and the tested objects because it thinks it's more effective..
    00062
    00063
    00072 class _OgreGLExport GLHardwareOcclusionQuery : public HardwareOcclusionQuery
    00073 {
    00074 //----------------------------------------------------------------------
    00075 // Public methods
    00076 //--
    00077 public:
    00082     GLHardwareOcclusionQuery();
    00086     ~GLHardwareOcclusionQuery();
    00087
    00088     //------------------------------------------------------------------
    00089     // Occlusion query functions (see base class documentation for this)
    00090     //--
    00091     void beginOcclusionQuery();
    00092     void endOcclusionQuery();
    00093     bool pullOcclusionQuery( unsigned int* NumOfFragments);
    00094     bool isStillOutstanding(void);
    00095
    00096
    00097     //----------------------------------------------------------------------
    00098     // private members
    00099     //--
    00100     private:
    00101
    00102         GLuint          mQueryID;
    00103 };
    00104
    00105 }
    00106
    00107 #endif
    00108

Copyright © 2012 Torus Knot Software Ltd
This work is licensed under a Creative Commons Attribution-ShareAlike 3.0 Unported License.
Last modified Sun Sep 2 2012 07:27:21