tree 3acf4f324407858d1e3fc6ef1960b52a8fd7f929
parent a604f0a824862dca82715e6183497752d57c4442
author Alec Mouri <alecmouri@google.com> 1564093349 -0700
committer Jorim Jaggi <jjaggi@google.com> 1564351858 +0000

[RenderEngine] Allow rounded corners shader to use lower precision.

Big corner radii would cause problems at lower precision because
computing a vector norm would overflow. But since highp tanks
performance, instead scale down and back up by a power of 2 during the
normalization operation, so that a higher precision is not required.

Bug: 137191934
Test: eyeballing systrace when opening Photos, GPU seems to take shorter
time and no jank is observed
Test: Stepping through frames from a Pixel 3 XL screenrecording shows
that the beginning of the app opening animation is rounded instead of
square

Change-Id: Ie7a39bd0f992f7f42414ef49de9873775cc34409
Exempt-From-Owner-Approval: Approved in qt-r1-dev