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pcwalton's profile
Patrick Walton
Patrick Walton
Patrick Walton
@pcwalton

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Patrick Walton

@pcwalton

Research engineer at Mozilla

San Francisco, CA
pcwalton.github.io
Joined November 2009

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    1. Steve Canon‏ @stephentyrone 9 Jul 2019
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      Replying to @stephentyrone @jckarter and

      But also new API should just use Double and avoid the problem, which we seem to be doing a terrible job with.

      1 reply 0 retweets 4 likes
    2. Joel Bernstein‏ @CastIrony 9 Jul 2019
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      Replying to @stephentyrone @jckarter and

      Should we radar?

      2 replies 0 retweets 0 likes
    3. Joe Groff‏ @jckarter 9 Jul 2019
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      Replying to @CastIrony @stephentyrone and

      It's too late for shipping ABIs. "change CGFloat.h so that CGFloat is always double on not-yet-defined platforms" might be a good action to take though

      2 replies 0 retweets 1 like
    4. Joel Bernstein‏ @CastIrony 9 Jul 2019
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      Replying to @jckarter @stephentyrone and

      I mean "SwiftUI should not use CGFloat/CGPoint/CGRect"

      1 reply 0 retweets 1 like
    5. Joe Groff‏ @jckarter 9 Jul 2019
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      Replying to @CastIrony @stephentyrone and

      You can certainly radar that too. It's a tough call, though; you're either impeding interop with Kit APIs, or impeding work with non-kit code

      1 reply 0 retweets 1 like
    6. Nick Lockwood‏ @nicklockwood 9 Jul 2019
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      Replying to @jckarter @CastIrony and

      What about something more magical, like CGFloat mapping to Double in Swift overlays, a-la NSUInteger becoming Int?

      1 reply 0 retweets 2 likes
    7. Steve Canon‏ @stephentyrone 9 Jul 2019
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      Replying to @nicklockwood @jckarter and

      Not source-compatible if we did it now. Doing it in <= Swift 3 might have worked.

      2 replies 0 retweets 2 likes
    8. Joe Groff‏ @jckarter 9 Jul 2019
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      Replying to @stephentyrone @nicklockwood and

      Even then, it's not ABI compatible. How would we map over pointers to buffers full of CGFloat?

      1 reply 0 retweets 3 likes
    9. Steve Canon‏ @stephentyrone 9 Jul 2019
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      Replying to @jckarter @nicklockwood and

      Magic type that converts to whatever CGFloat "really is" on store. Bring back x87 float-store bugs!

      1 reply 0 retweets 1 like
    10. Joe Groff‏ @jckarter 9 Jul 2019
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      Replying to @stephentyrone @nicklockwood and

      Of course, if we had the magic AnyNumber type and optimizer support for AIR mixed-precision math, none of these type differences would matter to the language ergonomics…

      1 reply 0 retweets 2 likes
      Patrick Walton‏ @pcwalton 9 Jul 2019
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      Replying to @jckarter @stephentyrone and

      This is an interesting thread because I use 32-bit floats exclusively in Pathfinder, and I can’t really go to 64-bit without sacrificing compatibility with many GPUs…

      11:56 AM - 9 Jul 2019
      • 5 Likes
      • Pohl Longsine Jed Davis 🏳️‍🌈 Joshua Yanovski eddyb, thriving in isolation, Joe Groff
      1 reply 0 retweets 5 likes
        1. New conversation
        2. Steve Canon‏ @stephentyrone 9 Jul 2019
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          Replying to @pcwalton @jckarter and

          If you don't need to have world-space coordinates that's usually fine. CGFloat gets used in a lot of "world-space-esque" ways though, and it causes problems.

          1 reply 0 retweets 3 likes
        3. Joe Groff‏ @jckarter 9 Jul 2019
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          Replying to @stephentyrone @pcwalton and

          Yeah, arguably a better solution than going to Double seems like it'd be to pair Float with a fixed-point translation

          1 reply 0 retweets 0 likes
        4. 4 more replies

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