> El 15 sep. 2022, a las 10:39, imacarthur <imacarthur@gmail.com> escribió:
> 
> On Wednesday, 14 September 2022 at 20:41:51 UTC+1 Gonzalo wrote:
> 
> 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). 
> 
> OK, so in looking for some old code to answer a question on fltk.general (Hi Gonzalo...) I found another bit of code I had.
> 
> If the question is about drawing a translucent FL window over a GL surface, I have code for this... Here's an example - it's GL2, but should Just Work.

No.  The question was about drawing translucent widgets (buttons, text inputs, etc) over GL3 window.  With GL2 it is easy, as calling the base Fl_Gl_Window::draw() at the end in the virtual draw function of the GL window does it. 

Your code turns the a normal fltk window semi transparent.

—
Gonzalo Garramuno
ggarra13@gmail.com




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