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Ilia Mirkin authored
This enables gl_Layer/gl_ViewportIndex when the ext is enabled, as well as adding the new gl_ViewportMask[] array and viewport_relative layout qualifier for gl_Layer. Signed-off-by: Ilia Mirkin <imirkin@alum.mit.edu> Acked-by: Marek Olšák <marek.olsak@amd.com> Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4529>
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