> El 16 sep. 2022, a las 04:17, Manolo <manolo.gouy@gmail.com> escribió:
> 
> 
> 
> Le vendredi 16 septembre 2022 à 00:04:43 UTC+2, Gonzalo a écrit :
> 
> 
> > El 15 sep. 2022, a las 13:45, Manolo  escribió: 
> > 
> > 
> > 
> > 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. 
> 
> I tried it on macOS and could not make it fail. It was always semi transparent. What triggers the disappearance of the transparency? 
> 
> What I see is:
> - run the program, the button's background is colored red blended to the underlying blue color; that's good;
> - hide the program (cmd-H) , show it again: the button is colored pure red; that's bad.
> 
> I run here macOS Ventura 13.0 public beta.  It might be a Ventura bug?
> 

No, if It is a bug it’s present on Monterrey too.


> 
> You had written in this thread on 9 sept :
> "On Linux and Windows this works, but on macOS, as Manolo said, it does not, as it does not allow 
> mixing OpenGL2 and OpenGL3+ calls. "
> I interpreted that meaning you solved how to combine GL3 + GL2 under Linux and Windows.
> 

Sorry.  I misspoke.  I was just repeating what you mentioned about GL3/2 compatibility without having tried it myself.

You had written on the 8th of September:
"Notice this restriction is macOS-specific. The other 3 platforms allow mixing."

—
Gonzalo Garramuno
ggarra13@gmail.com




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