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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 3

      BC7 has a weakness: There’s only a single alpha mode that supports 2 subsets (mode 7). And it assumes alpha is correlated with RGB. The other alpha modes are only 1 subset modes, so they can’t handle complex RGB blocks well.

      1 reply 3 retweets 11 likes
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      Rich Geldreich‏ @richgel999 Nov 3

      So if the block has uncorrelated alpha and is complex enough in RGB, there’s not a lot you can do. Either RGB suffers or alpha suffers.

      9:02 AM - 3 Nov 2018
      • 1 Retweet
      • 1 Like
      • TriΔng3l🔺
      2 replies 1 retweet 1 like
        1. New conversation
        2. Rich Geldreich‏ @richgel999 Nov 3

          Also: Modes 4 and 5 support component rotations, allowing one of the RGB components to be encoded seperately. This results in different looking artifacts vs. all other modes.

          1 reply 1 retweet 1 like
          Show this thread
        3. Rich Geldreich‏ @richgel999 Nov 3

          So as a developer using BC7, you need to be very careful what you decide to put into the alpha channel. Ideally it should be correlated (resemble strongly) RGB. It’s not really a fully separate channel like DXT5/BC3.

          2 replies 1 retweet 1 like
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        4. Rich Geldreich‏ @richgel999 Nov 3

          Our BC7 encoders will handle uncorrelated alpha better than the open source ones. We’re putting a lot of effort into this.

          2 replies 1 retweet 3 likes
          Show this thread
        5. Rich Geldreich‏ @richgel999 Nov 3

          BC7 has too many opaque-only modes (modes 0-3). Perhaps one of those modes could have been used for improved decorrelated alpha on complex blocks. RGB is good enough.

          1 reply 0 retweets 0 likes
          Show this thread
        6. Rich Geldreich‏ @richgel999 Nov 3

          Once your texture has an alpha channel you instantly lose half the modes in BC7. This is a flaw IMO. Most devs will be highly tempted to put in alpha data because BC7 is expensive (8bpp).

          1 reply 0 retweets 2 likes
          Show this thread
        7. Rich Geldreich‏ @richgel999 Nov 3

          Also, if your texture has decorrelated alpha, BC3 is stronger than you may think. BC3 has 5658 endpoints, while BC7 m4/5 have 5556 or 7776 endpoints.

          1 reply 0 retweets 0 likes
          Show this thread
        8. Rich Geldreich‏ @richgel999 Nov 3

          Some developers disable the mode 4/5 component rotation thing to avoid oddball artifacts with alpha textures, making these modes a little weaker.

          0 replies 0 retweets 0 likes
          Show this thread
        9. End of conversation
        1. New conversation
        2. Pär Winzell‏ @Zellski Nov 3
          Replying to @richgel999

          Does ASTC’s colour channel combination system fare better here?

          2 replies 0 retweets 0 likes
        3. Rich Geldreich‏ @richgel999 Nov 3
          Replying to @Zellski

          I’ll look (I don’t have ASTC burned into my brain like BC7 is).

          0 replies 0 retweets 0 likes
        4. End of conversation

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