For an interlaced display, this Returns the currently inactive field: 0 for an even field (the even scanlines starting at 0), and 1 for an odd field (the odd scanlines starting at 1).
The inactive field is the one you should draw to next to avoid tearing, the active field is the one currently being displayed.
For a progressive output, this should always return 0. We should also have some other call to indicate whether the display layer is interlaced or progressive, but this is a start.
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