Hi Victor, Wow, this must be the first time in 15 years or so that I look at OpenSG code... ;) Thanks to Carsten and Gerrit for keeping it alive, and you and the others for still using it!
Yes, subclassing is tricky, that was always a weakness of OpenSG. What may be easier is extension. How about adding a 'baseFramebufferID' field to indicate which FBO to use instead of 0? Just my $.02... Yours Dirk On Fri, Dec 11, 2020 at 10:54 AM Victor Haefner <victor.haef...@gmail.com> wrote: > Hello Carsten, > > thanks for the quick reply! > ..hmm, I think thats what glarea is already doing, and rendering most > scenes works perfectly. > It is only when using a stage that the gtk fbo get unbound. > > I thought I could rebind them on renderLeave of the stage, but subclassing > it is tricky ;) > Any hints on how to do this without necessarly registering a new type in > OpenSG? > I just want to override the renderLeave function. > > Maybe is there another way by messing with the render action? > I'm not sure.. > > best regards, > Victor > > On Thu, Dec 10, 2020 at 11:18 PM Carsten Neumann < > carsten.p.neum...@gmail.com> wrote: > >> Hello Victor, >> >> hmm, I can't really claim to have any understanding of how this works any >> longer, but a quick look at >> Source/System/Window/FrameBufferObjects/OSGFrameBufferObject.cpp:740 >> suggests that it always binds the default framebuffer (i.e. >> glBindFramebuffer(0)) when deactivating an FBO - it doesn't look like there >> is a customization point for this behaviour. >> Can you perform all your OpenSG rendering into an FBO and when it has >> completed manually blit to the GtkGLArea? It's a bit unnecessary work >> performing that extra copy, but may be the quickest way to get it running. >> >> Cheers, >> Carsten >> >> On Thu, Dec 10, 2020 at 3:24 PM Victor Haefner <victor.haef...@gmail.com> >> wrote: >> >>> Hello everyone, >>> >>> I just ported my application from Gtk2 to Gtk3. >>> Until now I used gtkglext to render with OpenSG into a widget. >>> There is a gtk3 port of gtkglext, but I had artifacts that I couldn't >>> get rid of. >>> So I tried GtkGLArea, it works, but I have a problem when using >>> framebuffers (for example for texture rendering). >>> GtkGLArea does not render directly to the window but instead to a >>> framebuffer and later cairo drawns the framebuffer to the widget vie a >>> shared GL context.. >>> When I use a framebuffer from OpenSG then once the rendering to it is >>> done, OpenSG resets the buffer with glBindFramebuffer(0) if I recall >>> correctly. >>> Normally this would be fine, but with the GtkGLArea it results in a >>> black window. >>> Instead It would need to bind to the framebuffers from the gtkglarea. >>> There is a convenience function to do this, how can I tell OpenSG to >>> call it after using a framebuffer? >>> >>> best regards, >>> Victor >>> _______________________________________________ >>> Opensg-users mailing list >>> Opensg-users@lists.sourceforge.net >>> https://lists.sourceforge.net/lists/listinfo/opensg-users >>> >> _______________________________________________ >> Opensg-users mailing list >> Opensg-users@lists.sourceforge.net >> https://lists.sourceforge.net/lists/listinfo/opensg-users >> > _______________________________________________ > Opensg-users mailing list > Opensg-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/opensg-users >
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