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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. Warren Moore‏ @warrenm 26 Sep 2015

      Turns out you can write your own custom image filters with Metal Performance Shaderspic.twitter.com/mYDVhbkGOZ

      3 replies 4 retweets 16 likes
    2. flexMonkey‏ @FlexMonkey 26 Sep 2015
      Replying to @warrenm

      @warrenm creating from scratch or as composites of existing shaders?

      1 reply 0 retweets 0 likes
    3. Warren Moore‏ @warrenm 26 Sep 2015
      Replying to @FlexMonkey

      @FlexMonkey Scratch. I subclassed MPSUnaryImageKernel, but the entire impl is custom.

      1 reply 0 retweets 1 like
    4. flexMonkey‏ @FlexMonkey 26 Sep 2015
      Replying to @warrenm

      @warrenm that's interesting. Does it offer any performance benefits over a regular compute shader?

      1 reply 0 retweets 0 likes
    5. Warren Moore‏ @warrenm 26 Sep 2015
      Replying to @FlexMonkey

      @FlexMonkey None at all, it just makes it easier to chain with the built-in filters if you use the MPSKernel interface.

      1 reply 0 retweets 1 like
    6. Ian Ollmann‏ @iollmann Jun 7
      Replying to @warrenm @FlexMonkey

      As the principal author of the MPSKernel class, while I applaud your bravery and ingenuity, I can’t say that this is at all recommended or tested. I am surprised it did not assert due to missing library or similar infrastructure that we add to all of them.

      2 replies 0 retweets 0 likes
    7. Warren Moore‏ @warrenm Jun 7
      Replying to @iollmann @FlexMonkey

      This was in the “dumb party tricks” category even at the time (>2.5 yrs ago!) If I were doing this today, I might borrow the Interface, but I wouldn’t piggy-back the implementation.

      2 replies 0 retweets 1 like
      Warren Moore‏ @warrenm Jun 7
      Replying to @warrenm @iollmann @FlexMonkey

      While I have you on the line, though: can you characterize the overhead of generating a command encoder for every encoded kernel? Why not take an encoder instead of a command buffer?

      5:42 PM - 7 Jun 2018
      0 replies 0 retweets 0 likes

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