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Seamless fallback #3801

merged 29 commits into from Mar 4, 2019


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commented Feb 20, 2019

This PR rewrites the logic for fallback rendering. In short:

  • the shader is now able to render arbitrary zoom steps. the lookupbuffer decodes which where the available bucket is and which zoomstep it has (instead of having a look up buffer for each zoom step)
  • the ortho bucket picker is able to select buckets for multiple zoom steps
  • the arbitrary bucket pickers only select one fallback at the moment. I think this is fine, since poorer quality is barely usable for flight mode tracing.
  • the loading strategy can be selected within the dataset settings.
  • also, forgive me father for I have sinned: I made some style tweaks to the settings sidebar, because I felt a strong urge to do so 馃檲

URL of deployed dev instance (used for testing):


Steps to test:

  • I tested both loading strategies while throttling the internet connection to dsl 6000



  • have lab test it
  • find better fix for flight mode bucket picking inaccuracy
  • write migration to add best-first loadingStrategy as preferred setting for all existing task types

@philippotto philippotto requested a review from daniel-wer Feb 20, 2019

@philippotto philippotto self-assigned this Feb 20, 2019

@philippotto philippotto marked this pull request as ready for review Feb 20, 2019

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Great PR, thanks for all the effort in improving the code quality and flexibility of the GPU rendering!

I'll have a look at whether it's easy to migrate the existing recommendedConfigurations.
Will test now :)

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Worked really well during testing for me, I didn't experience any black spots 馃憤

I did notice a lower frame rate during flight mode tracing (compared to orthogonal) - ~15FPS compared to ~30FPS and it felt kinda laggy, but I can't say how that compares to the status quo. Let's see what our testers say :)

philippotto and others added 7 commits Feb 26, 2019

@philippotto philippotto merged commit d6b562c into master Mar 4, 2019

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ci/circleci: build_test_deploy Your tests passed on CircleCI!

@normanrz normanrz deleted the seamless-fallback branch Aug 12, 2019

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