RE: [fltk.general] Choose OpenGL profile.

[MacArthur, Ian (Selex ES, UK)]

> Does FLTK support changing OpenGL profiles?

I'm the wrong person to answer this, as GL's not my strong suit at all, but I *think* the answer is possibly no...

> I'm not super-familiar with OpenGL myself but it was a
> question I was asked when I announced the Haskell bindings.
> I'll cut-and-paste the actual question here:
> " ... can I choose the OpenGL profile I'm using to be a current
> core profile like 3.3 or 4.1?"


So... what I did was created the basic Fl_Gl_Window, and I wanted to do a bunch of "clever" stuff that didn’t seem to be possible in the GL context there.

So, I created a bunch or GL renderbuffers and used a GL extension wrangler (I used glew) to figure out what GL capabilities and profiles were available on the host machine, and so on.

Then I basically drew everything into the renderbuffers, and at the "last minute" (basically in the draw method of my Fl_Gl_Window) I effectively blitted the rendered scene into the Fl_Gl_Window for display.

This meant I could set up the renderbuffers and use all the fancy stuff for my scene, and set the profile I wanted and such, without messing with the fltk GL state at all.

Now, there's almost certainly a better or cleverer way to do all this, but it seems to work! (And it seems to be fast, too.)





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[aditya siram]

I also did notice this: http://www.fltk.org/doc-1.3/Fl__Gl__Choice_8H_source.html which seems to do what I want.

Unfortunately it's an internal class, and there's no example documentation of usage.

Thanks your prompt reply!
-deech