[Impeller] Sample the gaussian function once per texture sample #40949
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Yeah just like with the text UV mapping, I don't think we were doing it properly to begin with. I tested out before/after your change and it doesn't seem to make the problem any worse than it already was, so I think we should keep it. |
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SGTM, ship it |
chinmaygarde
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auto label is removed for flutter/engine, pr: 40949, due to - The status or check suite Linux Unopt has failed. Please fix the issues identified (or deflake) before re-applying this label. |
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Continued drop in GPU utilization from this patch: |
Follow-up to remove the second gaussian sample, which isn't really improving quality.
For both before and after, I don't think we're sampling from the center of texels, and this is causing textures with high frequency info to "ripple" a bit when slowly increasing the blur radius (another issue might be that our texture downsizing is, again, too aggressive too early). I'm currently working out the best way to fix this and may follow-up with something.