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Emmanuele Bassi authored
If we're using modern GLSL, then we should stop using deprecated modifiers, like 'varying' and 'attribute', as well as deprecated global variables, like 'gl_FragColor'. On the other hand, with legacy contexts we should be using older GLSL shaders, to maximize compatibility. https://bugzilla.gnome.org/show_bug.cgi?id=756142
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