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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. Patrick Walton‏ @pcwalton May 24
      • Report Tweet
      • Report NetzDG Violation

      Figured I’d throw this out there: does anyone know the fastest way to *conservatively* rasterize lines on GPU? I’ve tried: (1) drawing instanced thin quads; (2) drawing thin quads w/o instancing (~15% faster); (3) glLineWidth(2.0) (fastest on NVIDIA, but deprecated)

      6 replies 5 retweets 19 likes
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    2. thom‏ @thomcsc May 24
      • Report Tweet
      • Report NetzDG Violation
      Replying to @pcwalton

      Directx has dedicated support for conservative rasterization (https://docs.microsoft.com/en-us/windows/win32/direct3d11/conservative-rasterization …, https://docs.microsoft.com/en-us/windows/win32/direct3d12/conservative-rasterization …), Have you tried it, or is it just non-viable for you (IIRC your stuff is mostly GL)

      1 reply 0 retweets 0 likes
    3. Patrick Walton‏ @pcwalton May 24
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      Replying to @thomcsc

      I have no hardware with support for it :( It’s new NVIDIA and Intel only, no AMD. Also Metal doesn’t support it.

      1 reply 0 retweets 1 like
    4. thom‏ @thomcsc May 24
      • Report Tweet
      • Report NetzDG Violation
      Replying to @pcwalton

      thom Retweeted thom

      Well... In that case... 🥲https://twitter.com/thomcsc/status/1263575493925720064 …

      thom added,

      thom @thomcsc
      Replying to @SimoRoth
      Since when has the word "deprecated" scared OpenGL programmers, anyway?
      1 reply 0 retweets 2 likes
    5. Patrick Walton‏ @pcwalton May 24
      • Report Tweet
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      Replying to @thomcsc

      Yeah, the problem is the spec doesn’t require glLineWidth to be supported with anything greater than 1. ANGLE supports only 1. Metal and D3D don’t support line width at all, though D3D does support antialiased lines so that might be an alternative.

      2 replies 0 retweets 0 likes
      Patrick Walton‏ @pcwalton May 24
      • Report Tweet
      • Report NetzDG Violation
      Replying to @pcwalton @thomcsc

      Annoyingly, I checked the Intel Gen manual and the feature is totally supported by their HW, it’s just hard to get access to it.

      9:53 PM - 24 May 2020
      0 replies 0 retweets 0 likes

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