> El 16 sep. 2022, a las 06:26, imm <imacarthur@gmail.com> escribió:
> 
> On Thu, 15 Sept 2022 at 23:17, Gonzalo wrote:
> 
>>> So... like creating an offscreen GL surface, and then getting the context for that, perhaps?
>> 
>> Yes.  The issue is that the offscreen GL surface is not drawn inside the GL window’s draw() method, so there’s no GL context.
>> 
> 

Okay.  Here’s how I solved it.  I created a class subclassing an Fl_Gl_Window of size 0, 0;  showed it so it created the context.   Then, in the draw() function I set the:

 if (! valid() )
{
// init gl, in my case with;
	initializeGL();
        valid(1);
}

The constructor of the class would create a thread calling the run() function of the class, which would process some movie thumbnails by calling make_current() just before the offscreen texture FBOs were created and drawn into.

—
Gonzalo Garramuno
ggarra13@gmail.com




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