Hmm, I realized the simplestage does also allow to register pre/post render functors In the pre render function the active fbo corresponds to the stage fbo I the post render function too. When changing the fbo in the pre render function the stage draws to the widget as expected. When changing it in the post rendering it does nothing. In OSGRenderPartition.cpp, in doExecution, the postrender functions are called before _pRenderTarget->deactivate I guess the fbo gets deactivated then..
furthermore the active FBO during renderEnter and renderLeave corresponds to the gtk fbo, thus replacing them wont help. I may still try with a stage as you suggested, best regards, Victor On Fri, Dec 11, 2020 at 5:48 PM Carsten Neumann <carsten.p.neum...@gmail.com> wrote: > Hello Victor, > > On Fri, Dec 11, 2020 at 10:54 AM Victor Haefner <victor.haef...@gmail.com> > wrote: > >> ..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. >> > > right, I meant putting a Stage at the top of your scene graph so that > OpenSG does not attempt to render anything into the default frame buffer > and manually blit that image to the GtkGLArea. > > >> 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.. >> > > I believe there is a CallbackStage (or similar name) that allows you to > execute code before/after the subtree below that stage is rendered; that > should allow you to bind the Gtk framebuffer object. > > Cheers, > Carsten > > > >> 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 >> > _______________________________________________ > Opensg-users mailing list > Opensg-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/opensg-users >
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