OpenWalnut 1.2.5
WGEOffscreenTexturePass.h
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 WGEOFFSCREENTEXTUREPASS_H
00026 #define WGEOFFSCREENTEXTUREPASS_H
00027 
00028 #include <string>
00029 
00030 #include <osg/Geode>
00031 #include <osg/TexMat>
00032 
00033 #include "WGEOffscreenRenderPass.h"
00034 
00035 class WGETextureHud;
00036 
00037 /**
00038  * This class encapsulates an OSG Camera and a corresponding framebuffer object. It is a specialized variant of \ref WGEOffscreenRenderPass,
00039  * optimized for processing textures. Therefore, it creates an correctly sized quad and can process each pixel in the fragment shader.
00040  */
00041 class WGEOffscreenTexturePass: public WGEOffscreenRenderPass
00042 {
00043 public:
00044 
00045     /**
00046      * Creates a new offscreen rendering instance.
00047      *
00048      * \param textureWidth the width of all the textures created and used by this render pass. This should be large enough for every reasonable
00049      *                     viewport size.
00050      * \param textureHeight the height of all the textures created and used by this render pass. This should be large enough for every reasonable
00051      *                     viewport size.*
00052      * \param num the order number. This camera gets rendered at the num'th place in the pre render queue of the subgraph it is attached to.
00053      */
00054     WGEOffscreenTexturePass( size_t textureWidth, size_t textureHeight, int num = 0 );
00055 
00056     /**
00057      * Creates a new offscreen rendering instance.
00058      *
00059      * \param textureWidth the width of all the textures created and used by this render pass. This should be large enough for every reasonable
00060      *                     viewport size.
00061      * \param textureHeight the height of all the textures created and used by this render pass. This should be large enough for every reasonable
00062      *                     viewport size.*
00063      * \param num the order number. This camera gets rendered at the num'th place in the pre render queue of the subgraph it is attached to.
00064      * \param hud the hud that gets notified about attached and detached textures. Useful for debugging.
00065      * \param name the name of this render pass. This is a nice debugging feature in conjunction with WGETextureHud as it gets displayed there.
00066      */
00067     WGEOffscreenTexturePass( size_t textureWidth, size_t textureHeight, osg::ref_ptr< WGETextureHud > hud, std::string name, int num = 0 );
00068 
00069     /**
00070      * Destructor.
00071      */
00072     virtual ~WGEOffscreenTexturePass();
00073 
00074 protected:
00075 private:
00076 
00077     /**
00078      * Sets the whole node up. Used to get some code duplication out of the constructors.
00079      */
00080     void setup();
00081 
00082     /**
00083      * The texture matrix for this pass. Used to scale the texture coordinates according to viewport/texture size relation.
00084      */
00085     osg::ref_ptr< osg::TexMat > m_texMat;
00086 
00087     /**
00088      * Callback which aligns and renders the textures.
00089      */
00090     class TextureMatrixUpdateCallback : public osg::NodeCallback
00091     {
00092     public: // NOLINT
00093 
00094         /**
00095          * Constructor.
00096          *
00097          * \param pass the pass to which this callback is applied. Needed for accessing some mebers.
00098          */
00099         explicit TextureMatrixUpdateCallback( WGEOffscreenTexturePass* pass ): m_pass( pass )
00100         {
00101         };
00102 
00103         /**
00104          * operator () - called during the update traversal.
00105          *
00106          * \param node the osg node
00107          * \param nv the node visitor
00108          */
00109         virtual void operator()( osg::Node* node, osg::NodeVisitor* nv );
00110 
00111         /**
00112          * The pass used in conjunction with this callback.
00113          */
00114         WGEOffscreenTexturePass* m_pass;
00115     };
00116 };
00117 
00118 #endif  // WGEOFFSCREENTEXTUREPASS_H
00119 
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