Is it really impossible to create a GdkGLContext with a shared context?

[cdehais (Christophe Dehais)]

Hi!
It seems the only way to create a GdkGLContext is through GdkWindow, which does not allow to specify a shared context. The “shared-context” property being construct-only, I figured I could try g_object_new() directly, but GdkGLContext is an abstract type, so no luck.

Is the sharing really reserved for internal use ? What’s the point of the get_shared_context() getter then ?

thanks,
Christophe

[ebassi (Emmanuele Bassi)]

All GdkGLContext instances are shared with the paint context used by GDK internally to render to a GdkWindow. This means that every GdkGLContext created by GDK is automatically shared.

The “shared-context” property is meant to be used by the various GdkGLContext implementations in every GDK windowing system backend.

@cdehais

What’s the point of the get_shared_context() getter then ?

So you can access the GL context used by GDK.

[cdehais (Christophe Dehais)]

Thank you, that clarifies things.

I’m using the context created by GLArea to initialize bgfx. I steal the FBO’s color attachment and make bgfx render into it, and all works perfectly (except that I need to call GLX directly to obtain the low-level context, so that won’t work if gdk uses e.g. EGL, like on wayland)