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While for normal textures, GL_TEXTURE_2D should be used, when it's an external texture, binding it using GL_TEXTURE_2D results in an error. Reading the specification for GL_TEXTURE_EXTERNAL_OES it is unclear whether getting pixel data from a texture is possible, and tests show it doesn't result in any data, but in case it would eventually start working, at least bind the correct target for now. https://gitlab.gnome.org/GNOME/mutter/merge_requests/362