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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. Mark Pospesel‏ @mpospese 27 Jan 2017

      Interesting glitch in 1st attempt to go directly from CVPixelBufferRef to OpenGL texture.pic.twitter.com/0TmdIPTEXH

      1 reply 0 retweets 3 likes
    2. invalidname  📦 🚚 🏡‏ @invalidname 27 Jan 2017
      Replying to @mpospese

      Not bad though! Just looks like a small mismatch between pixel formats/strides/whatever.

      1 reply 0 retweets 0 likes
    3. Mark Pospesel‏ @mpospese 27 Jan 2017
      Replying to @invalidname

      That was just the luma plane. If I use GL_RGBA I get correct image, but I think video is YUV420 so performance will be poor?

      1 reply 0 retweets 0 likes
    4. Mark Pospesel‏ @mpospese 27 Jan 2017
      Replying to @mpospese @invalidname

      In other words, I’m trying to skip the RGB conversion if I can. Not even sure that makes sense in this context.

      1 reply 0 retweets 0 likes
    5. invalidname  📦 🚚 🏡‏ @invalidname 27 Jan 2017
      Replying to @mpospese

      Ah, OK. Was about to try remember where you can get fast color space conversions (Core Image?), but you want to not do that at all

      1 reply 0 retweets 0 likes
    6. Mark Pospesel‏ @mpospese 27 Jan 2017
      Replying to @invalidname

      Yes just looking for fastest path from encoded video frames to pixels on screen for my particular input source.

      1 reply 0 retweets 1 like
      Warren Moore‏ @warrenm 27 Jan 2017
      Replying to @mpospese

      The answer is Metal, if it’s supported by all of your target devices.

      8:48 AM - 27 Jan 2017
      • 1 Like
      • Mark Pospesel
      2 replies 0 retweets 1 like
        1. Mark Pospesel‏ @mpospese 27 Jan 2017
          Replying to @warrenm

          ah good to know! Alas, we have to support iPhone 5 and maybe even 4S. For now.

          0 replies 0 retweets 0 likes
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        1. Mark Pospesel‏ @mpospese 27 Jan 2017
          Replying to @warrenm

          was definitely eyeing kCVPixelBufferMetalCompatibilityKey!

          0 replies 0 retweets 2 likes
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