tree ef258bd59d437236c2dae6f0c04654c189b93709
parent 23da073ba80c1fb6afcd0dfc01df201344645163
author Chris Forbes <chrisforbes@google.com> 1558125038 -0700
committer Chris Forbes <chrisforbes@google.com> 1558211910 +0000

Use custom normalization for SNORM formats in sampler

Previously we replicated the high bits into the low
and from that point on treated these values as 16 bits.

Unfortunately, that causes a snorm channel value of 0xff
to yield -1/32767 rather than the expected -1/127.

Bug: b/129523279
Test: dEQP-VK.image.mutable.*snorm*
Change-Id: I6e329490f92562d6edac86043e80fef978682c88
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/31728
Reviewed-by: Nicolas Capens <nicolascapens@google.com>
Tested-by: Chris Forbes <chrisforbes@google.com>
Kokoro-Presubmit: kokoro <noreply+kokoro@google.com>