[osg-users] Transparent Window Application for Windows and more OS
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Christian Schulte
Jul 29, 2015, 5:05:25 AM7/29/15
to OpenSceneGraph Users
Hello everyone,
I'm currently integrating in osgViewer the transparency an I'm looking for some advices.
I started with the code published by Chris Hidden on the mailing list, and modified it a little bit in order to be able to choose between color transparency (LWA_COLORKEY), or alpha transparency (LWA_ALPHA) or both. The probleme is that it is, for the moment, done during the window creation. What I wanted is to be able to adapt the LWA_COLORKEY whenever the user wants, same for LWA_ALPHA. My questions to the community :
I'm currently integrating in osgViewer the transparency an I'm looking for some advices.
I started with the code published by Chris Hidden on the mailing list, and modified it a little bit in order to be able to choose between color transparency (LWA_COLORKEY), or alpha transparency (LWA_ALPHA) or both. The probleme is that it is, for the moment, done during the window creation. What I wanted is to be able to adapt the LWA_COLORKEY whenever the user wants, same for LWA_ALPHA. My questions to the community :
- Where would be the right place to make these changes (as I need to be able to recover the window handle) ?
- Do you think that it could be interesting to be able to switch from transparent to non transparent during execution ?
- Should the color, alpha and activation boolean be added to the traits and be modified through GraphicsWindow class ?
- Has someone already implemented the transparency for another OS / Windowing System, and if yes could we try to unify the way it is done ?
Sorry for all these questions, but as it is my first contribution
try, I want to be sure to make no mistake !
Cheers,
Christian
-- SCHULTE Christian Ingénieur Recherche Responsable du Laboratoire de Simulation ONERA - DCSD/PSEV Département Commande des Systèmes et Dynamique du Vol ONERA - Centre de Salon de Provence BA 701 13661 SALON AIR Cedex - France Tel :04.90.17.01.45
Christian Schulte
Aug 27, 2015, 7:32:42 AM8/27/15
to osg-...@lists.openscenegraph.org
Hello everyone,
I succeeded in integrating transparent windows as well on Windows platform than on Linux X11. The only problem remaining is that I wanted to be able to modify the transparency color in a coherent way with the clearColor of the main camera. Is there a way to access the window handler during the (pre)render stage ? I don't want to integrate some platform specific code to the render stage code, but maybe there is a way to register a call to a method of osgViewer::GraphicsWindow implementation ?
Once I've treated this problem I will propose it on the submission list with a complete example for Linux and Windows.
Thanks for your help,
Christian
I succeeded in integrating transparent windows as well on Windows platform than on Linux X11. The only problem remaining is that I wanted to be able to modify the transparency color in a coherent way with the clearColor of the main camera. Is there a way to access the window handler during the (pre)render stage ? I don't want to integrate some platform specific code to the render stage code, but maybe there is a way to register a call to a method of osgViewer::GraphicsWindow implementation ?
Once I've treated this problem I will propose it on the submission list with a complete example for Linux and Windows.
Thanks for your help,
Christian
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