Giulio Camuffo wrote:
I don't see how that would help drawing client side decorations. Or are you talking about a different problem?
The problem I am talking about is that on X and Windows, if you have a window created for OpenGL rendering, the method used to get a "normal drawing context" (an HDC on Windows and a GC on X) does not work! You therefore cannot use existing drawing functions (ie toolkits) to draw into the same window as OpenGL.
I suspect this is about 99% of the reason for people using subwindows to render OpenGL under X and Windows. It certainly is the reason I do it. The fact that you have to account for the subwindow in your OpenGL code is minor in comparison, though I agree it would be nice to add this to the OpenGL/EGL api. In the same application we make subrectangles out of the OpenGL window (for dividing the viewer into 4 views) without any trouble.
Under wayland if you assume the "normal drawing context" is a cairo_t, and you can make a cairo_t from an OpenGL/EGL buffer, then this does seem like it would work. The current status of the Cairo OpenGL backend however worries me.
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