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richgel999's profile
Rich Geldreich
Rich Geldreich
Rich Geldreich
@richgel999

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Rich Geldreich

@richgel999

Entrepreneur at http://Binomial.info , Khronos member working on Basis. Ex-Valve/MS,Age1DE,3/Halo Wars/Portal2/DotA2/CS:GO.

Portland, OR
sites.google.com/site/richgel99/
Joined March 2011

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    1. Rich Geldreich‏ @richgel999 Nov 1

      I've found the Achilles Heel of all available practical CPU/GPU BC7 encoders: uncorrelated alpha channels. That's one of the ways my encoders are going to stand out. BC7 can handle uncorrelated alpha much better than I thought.

      1 reply 3 retweets 12 likes
    2. James Stanard‏ @JamesStanard Nov 2
      Replying to @richgel999

      Modes 4 & 5 are explicitly designed to handle it by having separate indices for the alpha channel. I'm surprised other encoders aren't getting this right.

      1 reply 0 retweets 1 like
      Rich Geldreich‏ @richgel999 Nov 2
      Replying to @JamesStanard

      Yup. Here are example pics from ispc_texcomp: http://richg42.blogspot.com/2018/10/bc7-with-decorrelated-alpha.html … I'm biasing my encoders to favor modes 4/5 mode often. I have a couple large AAA customers also wanting this fixed.

      12:51 PM - 2 Nov 2018
      1 reply 0 retweets 0 likes
        1. New conversation
        2. Rich Geldreich‏ @richgel999 Nov 2
          Replying to @richgel999 @JamesStanard

          I've found that encoders that only support unweighted squared RGBA distance (like ispc_texcomp) are at a large disadvantage here. Even ones that support custom RGBA weights (like my own non-RDO BC7 encoder, or AMD's) still have fidelity issues, even when you weight alpha highly.

          1 reply 0 retweets 0 likes
        3. Rich Geldreich‏ @richgel999 Nov 2
          Replying to @richgel999 @JamesStanard

          I first noticed this issue while working on my first ispc BC7 codec, but I figured I was doing as good (or equally as bad) as ispc_texcomp so I didn't investigate it more.

          1 reply 0 retweets 0 likes
        4. Rich Geldreich‏ @richgel999 Nov 2
          Replying to @richgel999 @JamesStanard

          This is easily reproduced: Just plug in two completely different, high quality images into RGB and alpha. Alpha tends to get really trashed. BC7 can do better; it's the encoders that are falling short.

          1 reply 0 retweets 0 likes
        5. Rich Geldreich‏ @richgel999 Nov 2
          Replying to @richgel999 @JamesStanard

          Also, modes 4/5 support component rotation. This is being overused - sometimes A gets lumped with 2 of the color channels causing excessive A error. The way existing codecs are evaluating error in RGBA mode is causing too much error to be introduced into A.

          1 reply 0 retweets 0 likes
        6. Rich Geldreich‏ @richgel999 Nov 2
          Replying to @richgel999 @JamesStanard

          My latest RDO BC7 codec favors mode 4 (with no rotation) and 6 for most blocks. Opaque mode uses modes 6 far mode than 1, and in alpha mode it uses mode 4 more than 6 and 7. Choosing between 6 vs. 1 in opaque mode is easy, but for the alpha blocks it's more complex.

          0 replies 0 retweets 0 likes
        7. End of conversation

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