OpenGL-Capable Widget OpenGL extension to GtkWidget API GtkGLExt is an extension to GTK which adds OpenGL capabilities to GtkWidget. Its use is quite simple: use #gtk_widget_set_gl_capability to add OpenGL support to a widget, it will create a OpenGL drawable (#GdkGLDrawable) for the widget, which can be obtained via #gtk_widget_get_gl_drawable. OpenGL rendering context (#GdkGLContext) can also be obtained via #gtk_widget_get_gl_context. With #GdkGLDrawable and #GdkGLContext, #gdk_gl_drawable_gl_begin and #gdk_gl_drawable_gl_end can be called, and OpenGL function calls can be made between those two functions. @widget: @glconfig: @share_list: @direct: @render_type: @Returns: @widget: @Returns: @widget: @Returns: @widget: @share_list: @direct: @render_type: @Returns: @widget: @Returns: @widget: @Returns: Returns the #GdkGLDrawable owned by the @widget. In fact, this is macro that casts the result of #gtk_widget_get_gl_window to #GdkGLDrawable. @widget: a #GtkWidget. @Returns: the #GdkGLDrawable.