commit 09d49a3bfe2d1e652a648ce1ea0962b38d10d166
author csmartdalton <csmartdalton@google.com> Mon Jul 04 15:55:17 2016 -0700
committer Commit bot <commit-bot@chromium.org> Mon Jul 04 15:55:17 2016 -0700
tree cc7ab96fee76e22b6180bcfb9b8073dd80d020f6
parent 2b2810b4eb423cc6a368b5f8b011a3508fef7a63

Fix caching of sample locations

The original caching logic for sample locations wishfully assumed that
the GPU would always use the same sample pattern for render targets
that had the same number of samples. It turns out we can't rely on
that. This change improves the caching logic to handle mismatched
simple patterns with the same count, and adds a unit test that
emulates different sample patterns observed on real hardware.

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2111423002

Review-Url: https://codereview.chromium.org/2111423002