Creates a new #GdkGLContext matching the
framebuffer format to the visual of the #GdkWindow. The context
is disconnected from any particular window or surface.
If the creation of the #GdkGLContext failed, @error will be set.
Before using the returned #GdkGLContext, you will need to
call gdk_gl_context_make_current() or gdk_gl_context_realize().
Creates a new #GdkGLContext matching the framebuffer format to the visual of the #GdkWindow. The context is disconnected from any particular window or surface.
If the creation of the #GdkGLContext failed, @error will be set.
Before using the returned #GdkGLContext, you will need to call gdk_gl_context_make_current() or gdk_gl_context_realize().