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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. Casey Muratori‏ @cmuratori 24 Mar 2015
      Replying to @cmuratori

      @egonelbre That said, even hardware technically does gamma wrong in premultiplied alpha :/

      1 reply 0 retweets 0 likes
    2. Casey Muratori‏ @cmuratori 24 Mar 2015
      Replying to @cmuratori

      @egonelbre At least as far as I understand it. I'm not exactly the world's leading gamma expert :)

      2 replies 0 retweets 0 likes
    3. Won Chun‏ @won3d 24 Mar 2015
      Replying to @cmuratori

      @cmuratori @egonelbre Do you think it is a compute or a storage/precision issue? Could approximate, e.g. gamma=2

      3 replies 0 retweets 0 likes
    4. Casey Muratori‏ @cmuratori 24 Mar 2015
      Replying to @won3d

      @won3d @egonelbre Well, it depends whether we're float or S16 for compute. Obviously we'll be U8 for storage.

      1 reply 0 retweets 0 likes
    5. Casey Muratori‏ @cmuratori 24 Mar 2015
      Replying to @cmuratori

      @won3d @egonelbre But yeah, if we do a CLUT for gamma, then with AVX that's easy but with SSE it sucks (no wide lookups).

      1 reply 0 retweets 0 likes
    6. Casey Muratori‏ @cmuratori 24 Mar 2015
      Replying to @cmuratori

      @won3d @egonelbre It we do compute for gamma, then we can stay wide but we've gotta do a bunch of approximations, and is that a win?

      3 replies 0 retweets 0 likes
    7. Won Chun‏ @won3d 24 Mar 2015
      Replying to @cmuratori

      @cmuratori @egonelbre It is a win. Are you thinking of using gather for AVX CLUT? Because...don't.

      2 replies 0 retweets 0 likes
    8. Casey Muratori‏ @cmuratori 24 Mar 2015
      Replying to @won3d

      @won3d @egonelbre Well, I'm not thinking about doing anything in AVX, since we're SSE2 :) But I was just saying you could do that.

      1 reply 0 retweets 0 likes
    9. Tom Forsyth‏ @tom_forsyth 24 Mar 2015
      Replying to @cmuratori

      @cmuratori @won3d @egonelbre Gather is currently like dpps. It looks like a cool instruction until you profile it.

      2 replies 0 retweets 0 likes
    10. Won Chun‏ @won3d 24 Mar 2015
      Replying to @tom_forsyth

      @tom_forsyth @cmuratori @egonelbre Was able to get AVX gather to help in one case, but it was tricky. Hopefully faster in Broadwell?

      2 replies 0 retweets 0 likes
      Casey Muratori‏ @cmuratori 24 Mar 2015
      Replying to @won3d

      @won3d @tom_forsyth @egonelbre It will be fixed in Gatherwell.

      7:48 AM - 24 Mar 2015
      • 1 Like
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