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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. your least favorite construct‏ @XMPPwocky 27 Mar 2019
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      Replying to @ManishEarth

      maybe, but I still feel like I'd read horse_matrix.then(bee_matrix).then(squirrel_matrix) as producing a matrix representing "transform by horse, then bee, then squirrel". But obviously if you disagree there exists a person for whom this isn't true :P

      1 reply 0 retweets 1 like
    2. Manish‏ @ManishEarth 27 Mar 2019
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      Replying to @XMPPwocky

      Manish Retweeted Manish

      Yephttps://twitter.com/ManishEarth/status/1111110449448124416?s=19 …

      Manish added,

      Manish @ManishEarth
      Replying to @hdevalence
      depends if you're talking about application order or written order
      1 reply 0 retweets 0 likes
    3. Manish‏ @ManishEarth 27 Mar 2019
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      Replying to @Gankra_ @XMPPwocky

      .PreScale has the same problem as .pre_mul, there are two possible ways of reading it (as an active or passive sentence) furthermore the connotation with pre/post multiplication of matrices further confuses things

      1 reply 0 retweets 0 likes
    4. Manish‏ @ManishEarth 27 Mar 2019
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      Replying to @ManishEarth @XMPPwocky

      if you've been writing code with this for a while it's fine because the assumptions ("we never talk in terms of matrices") are implicit but as someone who has only dabbled in Firefox graphics code, this shit confused me every. time.

      1 reply 0 retweets 0 likes
    5. Manish‏ @ManishEarth 27 Mar 2019
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      Replying to @Gankra_ @XMPPwocky

      Manish Retweeted Manish

      nohttps://twitter.com/ManishEarth/status/1111113959833112576?s=19 …

      Manish added,

      Manish @ManishEarth
      Replying to @ManishEarth @XMPPwocky
      Also, "nobody cares about or remembers matrix algebra" is incorrect. Graphics is literally one of the few CS courses I actually took as opposed to teaching myself, and I was taught with matrices
      2 replies 0 retweets 0 likes
    6. Manish‏ @ManishEarth 27 Mar 2019
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      Replying to @ManishEarth @XMPPwocky

      Manish Retweeted Patrick Walton

      Alsohttps://twitter.com/pcwalton/status/1111113678802178053?s=19 …

      Manish added,

      Patrick Walton @pcwalton
      Replying to @Gankra_ @ManishEarth
      Matrices are easier for me to deal with as a practitioner IMO
      1 reply 0 retweets 0 likes
    7. Manish‏ @ManishEarth 27 Mar 2019
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      Replying to @ManishEarth @XMPPwocky

      "everyone on the gfx team uses transforms" is tautological, of course they do, their code is 100% in terms of transforms

      1 reply 0 retweets 0 likes
    8. Manish‏ @ManishEarth 27 Mar 2019
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      Replying to @ManishEarth @XMPPwocky

      which came first, the gfx team, or the gfx code?

      1 reply 0 retweets 0 likes
      Patrick Walton‏ @pcwalton 27 Mar 2019
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      Replying to @ManishEarth @XMPPwocky

      In my case it also comes from working with GLSL where you basically have to use matrix math, so it’s easier for me to just use matrices everywhere

      8:56 PM - 27 Mar 2019
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      • Manish
      2 replies 0 retweets 1 like
        1. New conversation
        2. Patrick Walton‏ @pcwalton 27 Mar 2019
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          Replying to @pcwalton @ManishEarth @XMPPwocky

          To be clear I call Matrix3D Transform3D, but I don’t like the PreMul/PostMul distinction (and I know folks on the gfx team who don’t like it either)

          1 reply 0 retweets 1 like
        3. Manish‏ @ManishEarth 27 Mar 2019
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          Replying to @pcwalton @XMPPwocky

          Oh, I actually prefer working with transforms in code too, I just get confused with libraries because not everyone library looks at things the same way

          1 reply 0 retweets 0 likes
        4. 2 more replies
        1. Manish‏ @ManishEarth 27 Mar 2019
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          Replying to @pcwalton @XMPPwocky

          Right! Like I said, transforms are a leaky abstraction, you have to deal with matrices at *some* point, usually when sending them to GPUs. You can't completely pretend matrices don't exist, and as long as that is true readers of your code need to know *when* you can

          0 replies 0 retweets 1 like
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