Hello, My blending version doesn't work. Parts of the code:
// 1. create RTT-Texture (Rendertarget) ref_ptr<Texture2D> baseTex = createRenderTexture(width,height); // 2. Blend Texture ref_ptr<Texture2D> blendTex = new Texture2D; blendTex->setImage(osgDB::readImageFile(argv[2])); // 3. Quads ref_ptr< TexturedQuad > texQuad1 = new TexturedQuad(baseTex.get()); ref_ptr< TexturedQuad > texQuad2 = new TexturedQuad(blendTex.get()); // 4. Stack (Quad stack) ref_ptr<Group> stack = new Group; ref_ptr<MatrixTransform> mt1 = new MatrixTransform; mt1->setMatrix(Matrix::translate(0,0,-1)); mt1->addChild(texQuad1); stack->addChild(mt1); ref_ptr<MatrixTransform> mt2 = new MatrixTransform; mt2->setMatrix(Matrix::translate(0,0,0)); mt2->addChild(texQuad2); stack->addChild(mt2); // 5. BlendEquation BlendEquation* blendEquation = new BlendEquation(BlendEquation::FUNC_ADD); blendEquation->setDataVariance(Object::DYNAMIC); // 6. BlendFunc ref_ptr<BlendFunc> blendFunc = new BlendFunc(); blendFunc->setFunction(BlendFunc::ONE,BlendFunc::DST_COLOR ); // 7. StateSet StateSet* stateset = new StateSet; stateset->setDataVariance(Object::DYNAMIC); stateset->setAttributeAndModes(blendEquation,StateAttribute::OVERRIDE|StateAttribute::ON); stateset->setAttributeAndModes(blendFunc, StateAttribute::ON); stateset->setRenderingHint(StateSet::TRANSPARENT_BIN); stateset->setMode(GL_BLEND, StateAttribute::ON); // 8. RTT Camera osg::Camera* rtt_cam = new osg::Camera; rtt_cam->setClearColor(osg::Vec4(0,0,0,0)); //rtt_cam->setClearMask( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT ); rtt_cam->setViewport(0,0,width,height); rtt_cam->setRenderOrder(osg::Camera::PRE_RENDER, 0); rtt_cam->setRenderTargetImplementation( osg::Camera::FRAME_BUFFER ); rtt_cam->attach(osg::Camera::COLOR_BUFFER0, baseTex, 0, 0); rtt_cam->setReferenceFrame(osg::Transform::ABSOLUTE_RF); rtt_cam->setProjectionMatrixAsOrtho2D(0.0,1.0,0.0,1.0); rtt_cam->setViewMatrix(osg::Matrix::identity()); rtt_cam->addChild(stack); I think that is the important code. It doesn't increment the blend texture. If I change the camera, it looks like a infinite mirror. What is my mistake? I think I don't understand the blendequation in combination with RTT. Regards, Martin -------- Original-Nachricht -------- > Datum: Tue, 22 Feb 2011 14:02:30 +0100 > Von: "Martin Großer" <[email protected]> > An: OpenSceneGraph Users <[email protected]> > Betreff: Re: [osg-users] Can I increment the gl_FragData? > Hello Juan, > > I think in my case the ping-pong is OK, because I want to render a > fullscreen quad. I developed a texture painting tool which is hardware > accelerated. I can do it very easy with a glsl shader. Only the RTT into the > image is > the bottle neck. > > I will try the three versions. > > 1. OSG: PingPong > 2. OSG: Blending > 3. OpenGL: EXT_shader_image_load_store > > I will post my results here in the mailing list. Then we can talk about > the osg integration. > > It seems to me that the discussion was very useful. Thank you very much. > > Regards, > > Martin > > -------- Original-Nachricht -------- > > Datum: Tue, 22 Feb 2011 13:23:26 +0100 > > Von: Juan Hernando <[email protected]> > > An: OpenSceneGraph Users <[email protected]> > > Betreff: Re: [osg-users] Can I increment the gl_FragData? > > > Hi Martin, > > > I don't understand the fact that I need a swap per triangle. In the > > > osggameoflife there is one swap per render pass. > > It depends on what you want to do. > > If you are rendering a fullscreen quad and performing some pixel level > > operations, then ping-pong textures are OK. This is the case of the game > > of life example. > > However, if you are combining into each target pixel the contribution of > > all the triangles that hit that pixel, then you can't use ping-pong > > because you have to swap the read and write textures after each triangle > > (I assume you are not binding the same texture as input and output for a > > shader because it has undefined behaviour). For example, this would be > > the case when you want to count the fragments falling into a pixel. If > > you can't use blending operations to do your calculations, then > > EXT_shader_image_load_store may be the last resort. > > > > > So my object is for > > > example a wall (plane) and I want to add a texture (brush) to this > > > wall like a airbrush. That is a simple test scenario. > > Assuming your wall is screen aligned, I'd say that this airbrush example > > falls in the category of blending. However, if your actual intent is to > > develop a realtime texture painting tool then, it might be easier to do > > it in completely in the CPU (I'm not an expert in texturing so there > > might be some clever tricks to take advantange of OpenGL to do it with > > random access image buffers). > > > > > Ok first of all I should try the additive blending with osg::TexEnv. > > > After this I can try a example with the extension > > > EXT_shader_image_load_store. I have a NV GTX470, it should work. And > > > then we can talk about a integration in OSG. I can send the example > > > and we can discuss a suitable design. I am very interested in a > > > smoothly integration in OSG. > > Me too ;) > > > > Cheers, > > Juan > > _______________________________________________ > > osg-users mailing list > > [email protected] > > > http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org > > -- > NEU: FreePhone - kostenlos mobil telefonieren und surfen! > Jetzt informieren: http://www.gmx.net/de/go/freephone > _______________________________________________ > osg-users mailing list > [email protected] > http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org -- Schon gehört? 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