Ok, I didn't understood that. So, either way I need the ping pong process. I am writing the ping pong version at the moment. I hope this works but more about that later. :-)
Regards, Martin -------- Original-Nachricht -------- > Datum: Wed, 23 Feb 2011 10:31:34 +0100 > Von: Juan Hernando <[email protected]> > An: OpenSceneGraph Users <[email protected]> > Betreff: Re: [osg-users] Can I increment the gl_FragData? > > Yes the baseTex is bound as input texture and it is also the render > > target of the FBO. I thought I can use the blendequation for the > > iterative adding of a texture. Did I misunderstood that? > With the blend equations you can mix and incoming fragment with the > value stored in the framebuffer for the corresponding pixel/sample. For > example, you can create a FBO with just a color buffer texture, clear it > to 0 and then, for each incoming fragment, use additive blending to > count fragments per pixel. > You can't use a texture as both input and output because the results are > completely undefined. The memory pipeline is deep and blending > operations are performed in special hardware units closely coupled to > the memory controller. Add texture caches to the picture and it becomes > impossible to predict what might happen if you write non-conformant > code. In your case, the typical results are what you were seeing > yesterday, the texture doesn't seem to get updated or you get a funny > recursive pattern. > If you want to add two (or more) textures, then attach each texture to a > different quad and create an extra texture as the framebuffer target. > You will have to ping-pong the output texture and one of the input > textures if you are going to use only two input textures and repeat the > procedure iteratively. > > Juan > _______________________________________________ > osg-users mailing list > [email protected] > http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org -- Schon gehört? GMX hat einen genialen Phishing-Filter in die Toolbar eingebaut! http://www.gmx.net/de/go/toolbar _______________________________________________ osg-users mailing list [email protected] http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
