When a VC is detached into an independent window or re-attached back
to the main window via gd_tab_window_close(), its underlying EGL surface
and context are destroyed and recreated.
However, the associated FB objects (guest_fb, win_fb, cursor_fb),
display surface textures, and shader instances were not being cleaned up
during these transitions, leading to potential resource leaks.
Introduce a helper function, gd_gl_release_resources(), to make the
appropriate GL context current, delete the textures and framebuffers,
release the shader instance, and reset state pointers.
Use this helper in gd_tab_window_close(), gd_menu_untabify(), and refactor
gd_vc_free() to use it as well.
Cc: Daniel P. Berrangé <berrange@redhat.com>
Cc: Marc-André Lureau <marcandre.lureau@redhat.com>
Signed-off-by: Dongwon Kim <dongwon.kim@intel.com>
Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Message-ID: <20260729134759.2877-1-dongwon.kim@intel.com>
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