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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 26 Mar 2018
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      The WebGL version of Google Maps overdraws like crazy, which is why it’s slow. That depth buffer is your friend, folks! Use it!

      2 replies 3 retweets 36 likes
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    2. Patrick Walton‏ @pcwalton 26 Mar 2018
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      Not sold on Google Maps’ use of signed distance fields for text either. It makes small text blurry, presumably because it’s downsampled. SDF only really helps magnification, which they don’t do much.

      1 reply 0 retweets 8 likes
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    3. Patrick Walton‏ @pcwalton 26 Mar 2018
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      Almost every Google Maps shader has a discard in it. I don’t see why this is needed. Not that they’re getting much benefit from early Z anyway since they draw back to front :(

      3 replies 0 retweets 8 likes
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    4. John Firebaugh‏ @jfire 26 Mar 2018
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      Replying to @pcwalton

      Early Z is hard because map designers tend to want to make everything slightly transparent.

      2 replies 0 retweets 2 likes
    5. Patrick Walton‏ @pcwalton 26 Mar 2018
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      Replying to @jfire

      Well, it does things like draw a gray background over the Presidio, only to cover it with green later.

      1 reply 0 retweets 0 likes
    6. John Firebaugh‏ @jfire 26 Mar 2018
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      Replying to @pcwalton

      I can think of a number of (arguably) legitimate reasons to do this. We've considered it for Mapbox GL; see https://github.com/mapbox/mapbox-gl-js/issues/2074 … for details.

      1 reply 0 retweets 0 likes
    7. Patrick Walton‏ @pcwalton 26 Mar 2018
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      Replying to @jfire

      Hmm, when I removed early Z in Pathfinder my performance cratered on workloads like the tiger. For AA I ended up with a 2-pass implementation that fills all opaque interiors front to back and then, with early Z on, antialiases back to front.

      2 replies 0 retweets 0 likes
    8. John Firebaugh‏ @jfire 26 Mar 2018
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      Replying to @pcwalton

      Yeah, this is what mbgl does too. We haven't benchmarked removing early Z, but we have a number of z-indexing bugs that would be fixed by doing so.

      1 reply 0 retweets 0 likes
      Patrick Walton‏ @pcwalton 26 Mar 2018
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      Replying to @jfire

      Yeah, early Z is such a pain…there’s so much code in WebRender needed to make it work :( But at least in our experience it’s been very much worth it…

      9:48 PM - 26 Mar 2018 from Civic Center, San Francisco
      0 replies 0 retweets 0 likes

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