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[Impeller] Optimize away intersect clips that cover the entire pass target. #51736
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…145934) flutter/engine@a396dc1...c176d11 2024-03-28 [email protected] Roll Skia from c0e0b76d6d51 to e25b0f9006a4 (2 revisions) (flutter/engine#51757) 2024-03-28 [email protected] [Impeller] Optimize away intersect clips that cover the entire pass target. (flutter/engine#51736) If this roll has caused a breakage, revert this CL and stop the roller using the controls here: https://autoroll.skia.org/r/flutter-engine-flutter-autoroll Please CC [email protected],[email protected],[email protected] on the revert to ensure that a human is aware of the problem. To file a bug in Flutter: https://github.com/flutter/flutter/issues/new/choose To report a problem with the AutoRoller itself, please file a bug: https://issues.skia.org/issues/new?component=1389291&template=1850622 Documentation for the AutoRoller is here: https://skia.googlesource.com/buildbot/+doc/main/autoroll/README.md
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I tested against a few example apps and found this case is actually very common. These full screen/pass clips render nothing to the depth buffer can be particularly troublesome in the presence of backdrop filters (due to clip replay).
While this case doesn't actually result in anything getting written to the depth buffer, we still end up overwriting the entire stencil buffer twice: Once for the preparation draw, and again for the depth buffer transfer/stencil cleanup draw.