OpenWalnut
1.4.0
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00001 //--------------------------------------------------------------------------- 00002 // 00003 // Project: OpenWalnut ( http://www.openwalnut.org ) 00004 // 00005 // Copyright 2009 OpenWalnut Community, BSV@Uni-Leipzig and CNCF@MPI-CBS 00006 // For more information see http://www.openwalnut.org/copying 00007 // 00008 // This file is part of OpenWalnut. 00009 // 00010 // OpenWalnut is free software: you can redistribute it and/or modify 00011 // it under the terms of the GNU Lesser General Public License as published by 00012 // the Free Software Foundation, either version 3 of the License, or 00013 // (at your option) any later version. 00014 // 00015 // OpenWalnut is distributed in the hope that it will be useful, 00016 // but WITHOUT ANY WARRANTY; without even the implied warranty of 00017 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 00018 // GNU Lesser General Public License for more details. 00019 // 00020 // You should have received a copy of the GNU Lesser General Public License 00021 // along with OpenWalnut. If not, see <http://www.gnu.org/licenses/>. 00022 // 00023 //--------------------------------------------------------------------------- 00024 00025 #ifndef WGEVIEWPORTCALLBACK_H 00026 #define WGEVIEWPORTCALLBACK_H 00027 00028 #include <osg/Camera> 00029 #include <osg/Node> 00030 00031 #include "../WGECamera.h" 00032 00033 /** 00034 * This callback is useful to update viewport information on several nodes supporting it. The specified type must support an setViewport method. 00035 * This is especially useful to keep offscreen render cameras in sync with the scene cam or to update HUD viewport information. Note that the 00036 * order of execution of callbacks for a node can cause problems as the new viewport might get set after it is needed. 00037 * 00038 * \tparam T the type supporting setViewport 00039 * \tparam Source the type from who the viewport should be acquired by using osg::Viewport* getViewport() 00040 */ 00041 template < typename T, typename Source = WGECamera > 00042 class WGEViewportCallback: public osg::NodeCallback 00043 { 00044 public: 00045 /** 00046 * Creates new instance of viewport callback and sets the viewport size to the reference camera size 00047 * 00048 * \param reference set the viewport to the one of the reference camera. 00049 */ 00050 explicit WGEViewportCallback( osg::ref_ptr< Source > reference ); 00051 00052 /** 00053 * Creates new instance of viewport callback and sets the viewport size to the specified size 00054 * 00055 * \param width viewport width 00056 * \param height viewport height 00057 */ 00058 WGEViewportCallback( size_t width, size_t height ); 00059 00060 /** 00061 * Destructor. 00062 */ 00063 virtual ~WGEViewportCallback(); 00064 00065 /** 00066 * This operator gets called by OSG every update cycle. It applies the viewport. 00067 * 00068 * \param node the osg node 00069 * \param nv the node visitor 00070 */ 00071 virtual void operator()( osg::Node* node, osg::NodeVisitor* nv ); 00072 00073 protected: 00074 private: 00075 /** 00076 * The reference camera to use. 00077 */ 00078 osg::ref_ptr< Source > m_reference; 00079 00080 /** 00081 * Forced viewport width 00082 */ 00083 size_t m_width; 00084 00085 /** 00086 * Forced viewport height 00087 */ 00088 size_t m_height; 00089 }; 00090 00091 template < typename T, typename Source > 00092 WGEViewportCallback< T, Source >::WGEViewportCallback( osg::ref_ptr< Source > reference ): 00093 osg::NodeCallback(), 00094 m_reference( reference ), 00095 m_width( 0 ), 00096 m_height( 0 ) 00097 { 00098 // initialize members 00099 } 00100 00101 template < typename T, typename Source > 00102 WGEViewportCallback< T, Source >::WGEViewportCallback( size_t width, size_t height ): 00103 osg::NodeCallback(), 00104 m_reference( NULL ), 00105 m_width( width ), 00106 m_height( height ) 00107 { 00108 // initialize members 00109 } 00110 00111 template < typename T, typename Source > 00112 WGEViewportCallback< T, Source >::~WGEViewportCallback() 00113 { 00114 // cleanup 00115 } 00116 00117 template < typename T, typename Source > 00118 void WGEViewportCallback< T, Source >::operator()( osg::Node* node, osg::NodeVisitor* nv ) 00119 { 00120 osg::ref_ptr< T > t = dynamic_cast< T* >( node ); 00121 if( t ) 00122 { 00123 if( m_reference ) 00124 { 00125 t->setViewport( m_reference->getViewport() ); 00126 } 00127 else 00128 { 00129 t->setViewport( new osg::Viewport( 0, 0, m_width, m_height ) ); 00130 } 00131 } 00132 traverse( node, nv ); 00133 } 00134 00135 #endif // WGEVIEWPORTCALLBACK_H 00136