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There are two tests; one checks that clearing with a color that cannot be represented using 8 bits per channel doesn't loose precision when painted, then read back using glReadPixels(). Would the texture backing store have 8 bits per channel instead of 10, we'd get a different value back. The other test checks that painting from one fbo to another also doesn't loose that precision. Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/2461>