The N64's Reality Display Processor actually used that 9th bit as a coverage mas... | Hacker News

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		ethan_smith 4 months ago \| parent \| context \| favorite \| on: We'd be better off with 9-bit bytes The N64's Reality Display Processor actually used that 9th bit as a coverage mask for antialiasing, allowing per-pixel alpha blending without additional memory lookups.

monocasa 4 months ago [–]

As well as extra bits in the Z buffer to give it a 15.3 fixed point format.

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