Re: [platform-swt-dev] GL Support in SWT. Why the paradigm shift?

[Billy Biggs <vektor@xxxxxxxxxxxx>]

  Hi Ivan, thanks for looking at the GL stuff, I hope the Fox port isn't
too difficult ;)

> I'm just curious as to why you changed from the more "orthogonal"
> GLContext-based OpenGL support, to the GLCanvas based one?
> While it means less work for SWT/Fox (GLCanvas will map nicely to
> FXGLCanvas, it seems), and while I understand that using GL on Image
> is rarely a good idea because X11 pixmaps + GLX means software GL, the
> GLCanvas thing does not allow to draw with GL on arbitrary
> Composite/Canvas widget, as it used to be. 

  Under X, the pixel format is tied to the visual used to create the
window you're going to draw on.  So, we needed some sort of GLCanvas
widget regardless.  Since I don't have any control over the visuals used
by random Composite widgets, I thought it would be better to leave that
functionality out, at least for now.

  It's similar for offscreen images where you need to have a GLXPixmap,
but I want to understand the options better before introducing a
GLImage.

  -Billy