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cmuratori's profile
Casey Muratori
Casey Muratori
Casey Muratori
@cmuratori

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Casey Muratori

@cmuratori

I'm worried that the baby thinks people can't change.

Seattle
caseymuratori.com
Joined March 2009

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    1. Fabian Giesen‏ @rygorous 18 Jun 2015

      Yowza. Console graphics API tells me to alloc a 3840x2160 R8_UNORM tex with 4k row pitch. I know HW just needs 256b alignment,

      1 reply 0 retweets 3 likes
    2. Fabian Giesen‏ @rygorous 18 Jun 2015
      Replying to @rygorous

      @rygorous so I alloc it at 3840 bytes instead... 13% reduction in frame decode time. 4k aliasing between adjacent scan lines is BAD, m'kay?

      2 replies 1 retweet 4 likes
    3. Fabian Giesen‏ @rygorous 18 Jun 2015
      Replying to @rygorous

      @rygorous Also, programmer pow2 OCD be damned, that's one solid advantage of popular resolutions NOT having pow2 widths...

      2 replies 0 retweets 4 likes
    4. Casey Muratori‏ @cmuratori 18 Jun 2015
      Replying to @rygorous

      @rygorous Wait, where is the advantage? If you're saying you could always pad with 256-byte chunks, any dimension would be fine, right?

      1 reply 0 retweets 0 likes
    5. Fabian Giesen‏ @rygorous 18 Jun 2015
      Replying to @cmuratori

      @cmuratori If you can pick the pitch yourself it doesn't matter, but most APIs don't let you.

      1 reply 0 retweets 0 likes
    6. Fabian Giesen‏ @rygorous 18 Jun 2015
      Replying to @rygorous

      @cmuratori In fact most things default to "densely packed lines" and in that case pow2 widths are really bad.

      1 reply 0 retweets 0 likes
      Casey Muratori‏ @cmuratori 18 Jun 2015
      Replying to @rygorous

      @rygorous But if you can't pick the pitch, then you're back to wasting a lot of memory though, if the system needs pow2 align for features?

      4:48 PM - 18 Jun 2015
      2 replies 0 retweets 0 likes
        1. New conversation
        2. Fabian Giesen‏ @rygorous 18 Jun 2015
          Replying to @cmuratori

          @cmuratori I don't see what the one has to do with the other. Just because the API doesn't let me pick pitch doesn't mean the HW doesn't.

          1 reply 0 retweets 0 likes
        3. Fabian Giesen‏ @rygorous 18 Jun 2015
          Replying to @rygorous

          @cmuratori (Conversely, most HW does let you pick pitch in some cases but forces pow2 in others.)

          0 replies 0 retweets 0 likes
        4. End of conversation
        1. New conversation
        2. Tom Forsyth‏ @tom_forsyth 18 Jun 2015
          Replying to @cmuratori

          @cmuratori @rygorous I'm a little surprised the set address isn't a hash of more bits of the address, not just a simple subset.

          3 replies 0 retweets 0 likes
        3. Fabian Giesen‏ @rygorous 18 Jun 2015
          Replying to @tom_forsyth

          @tom_forsyth @cmuratori Who said the slowdown was due to cache set conflicts? That's probably a factor, but there's bigger fish to fry.

          1 reply 0 retweets 0 likes
        4. Show replies

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