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Le mercredi 14 septembre 2022 à 21:41:51 UTC+2, Gonzalo a écrit :
> El 13 sep. 2022, a las 06:28, Manolo escribió:
>
> @Gonzalo: I realize now my proposal was wrong.
> The good solution is not to use a transparent GL2 window but a transparent normal window,
> see attached example program which builds upon OpenGL3test.cxx :
>
That *almost* works. What is missing is giving the button a transparent or semi-transparent color, like in the cube.cxx demo. I would need that, or a FL_STENCIL on the window, so I can implement drawing in the window (with erasing with the stencil).
I attach a new attempt to allow transparent colors. It uses the recent changes to FLTK 1.4 committed to git.
Unfortunately it works only partially under macOS because transparency starts correctly but then disappears, for a reason that remains unclear to me. The code is meant to be cross platform with a macOS version and a version for other platforms. It works well under the wayland platform. But the transition between GL3-style and GL2-style drawing that works under Wayland fails under X11. Did you succeed in doing that? If yes, can you, please, share your procedure?
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