tree b86afff12bcdd7f534c6a13c65c4ad868b42bb4a
parent 67180a07f8d56f2092da889fbf26073d72d6b47d
author Alexis Hetu <sugoi@google.com> 1560872602 -0400
committer Alexis Hétu <sugoi@google.com> 1560878811 +0000

Increase precision of 8 bit textures

Only use the upper 8 bits of the 16 bit fields when reading
and outputting 8 bit values in order to get exact
representations of x/255 for each possible 8 bit value.

Bug: swiftshader:122
Bug: b/129523279

Change-Id: I0cd54eb325c24f2fc5a53f12a0b90696024ca9d1
Tests: dEQP-VK.memory.pipeline_barrier.all.*
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/33028
Tested-by: Alexis Hétu <sugoi@google.com>
Reviewed-by: Chris Forbes <chrisforbes@google.com>
Kokoro-Presubmit: kokoro <noreply+kokoro@google.com>