tree 0ce1eec70bc8a0616ebaae126b8227179d8285af
parent 3fe96b789504e16d64a558d95db670b435662cbd
author Alexis Hetu <sugoi@google.com> 1611343506 -0500
committer swiftshader-scoped@luci-project-accounts.iam.gserviceaccount.com <swiftshader-scoped@luci-project-accounts.iam.gserviceaccount.com> 1611348450 +0000

Flip samples to their correct position

SwANGLE tests detected that SwiftShader's sample positions were 180
degree flipped from Vulkan's exact sample locations. Most multisampling
tests we've run with SwiftShader so far relied on resolved outputs,
so having the samples in the wrong order didn't matter, as long as we
had the correct 4 samples (which we do, since the samples are
essentially rotated by 90 degrees around the center of the pixel from
each other).

Bug: b/170962186
Bug: b/141380498
Change-Id: I65552863e1fe38b321b84995e038984488512e1c
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/52088
Reviewed-by: Nicolas Capens <nicolascapens@google.com>
Tested-by: Alexis Hétu <sugoi@google.com>
Commit-Queue: Alexis Hétu <sugoi@google.com>
Kokoro-Result: kokoro <noreply+kokoro@google.com>