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warrenm's profile
Warren Moore
Warren Moore
Warren Moore
@warrenm

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Warren Moore

@warrenm

Software engineer specializing in mobile graphics and augmented reality. Author of “Metal by Example”

San Francisco, CA
metalbyexample.com
Joined April 2008

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    1. bitCycle‏ @bitCycle 4 Apr 2016

      @warrenm How to best implement a histogram using Metal compute functions? Any examples / documentation on that?

      1 reply 0 retweets 0 likes
    2. Jessy Catterwaul‏ @jessyMeow 4 Apr 2016
      Replying to @bitCycle

      @warrenm @bitCycle, are you trying to beat https://developer.apple.com/library/tvos/documentation/MetalPerformanceShaders/Reference/MPSImageHistogram_ClassReference/index.html#//apple_ref/occ/cl/MPSImageHistogram … ? Seems like it would consist of atomic per-pixel adds, then normalize?

      1 reply 0 retweets 0 likes
    3. bitCycle‏ @bitCycle 4 Apr 2016
      Replying to @jessyMeow

      @jessyMeow @warrenm I'm not trying to reinvent / beat anything :) My goal is something else, but first want to study impl of similar things.

      1 reply 0 retweets 0 likes
    4. bitCycle‏ @bitCycle 4 Apr 2016
      Replying to @bitCycle

      @jessyMeow @warrenm Ie, my intention is to learn things. But could use more docs & exsamples. How to do atomic per pixel adds for example?

      1 reply 0 retweets 0 likes
    5. Jessy Catterwaul‏ @jessyMeow 4 Apr 2016
      Replying to @bitCycle

      @bitCycle @warrenm atomic_fetch_add_explicit under “Atomic Functions”, w/1 atomic_uint per-value is what I imagined. https://developer.apple.com/library/ios/documentation/Metal/Reference/MetalShadingLanguageGuide/std-lib/std-lib.html …

      1 reply 0 retweets 1 like
    6. bitCycle‏ @bitCycle 4 Apr 2016
      Replying to @jessyMeow

      @jessyMeow @warrenm Thanks! I'll try to figure things out and experiment. The docs are a bit too terse for me though ...

      2 replies 0 retweets 1 like
      Warren Moore‏ @warrenm 4 Apr 2016
      Replying to @bitCycle

      @bitCycle @jessyMeow Sorry for not chiming in on this earlier. Do you feel like you’ll be able to make progress on this now?

      11:10 AM - 4 Apr 2016
      2 replies 0 retweets 0 likes
        1. New conversation
        1. bitCycle‏ @bitCycle 4 Apr 2016
          Replying to @warrenm

          @warrenm @jessyMeow Would be great if there were some examples of using the atomic functions etc.

          1 reply 0 retweets 2 likes
        2. Jessy Catterwaul‏ @jessyMeow 4 Apr 2016
          Replying to @bitCycle

          @warrenm @bitCycle No doubt. I’d never done any programming with threads or atomicity, before Metal last year. I resorted to the CUDA docs!😹

          0 replies 0 retweets 1 like
          3. End of conversation
        2. New conversation
        1. Jessy Catterwaul‏ @jessyMeow 4 Apr 2016
          Replying to @warrenm

          @bitCycle @warrenm, do you have any idea if I’m on the right track? I’ve never seen histogram code or even algorithms; just used Metal & PS.

          1 reply 0 retweets 0 likes
        2. Warren Moore‏ @warrenm 4 Apr 2016
          Replying to @jessyMeow

          @jessyMeow @bitCycle You got it; basically categorize each pixel in a bucket (either per-component or by luminance) and atomically increment

          0 replies 0 retweets 1 like
          3. End of conversation

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