tree 41ae62d279ef1d2149e1a5692745632fb8396911
parent 0f33b0ba71b2cc4e3b0d6842c1cc94a780c4e67e
author Pyry Haulos <phaulos@google.com> 1489701040 -0700
committer Pyry Haulos <phaulos@google.com> 1490287520 -0400

Imgtec Waiver for SNORM linear filtering

Due to an error in bit replication of the fixed point SNORM values,
linear filtered negative SNORM values will differ slightly from ideal
precision in the last bit, moving the values towards 0.

This occurs on all members of the PowerVR Rogue family of GPUs

Affected tests are changed to allow for larger error and issue
QualityWarning when inaccurate results are found.

Affects:

dEQP-VK.pipeline.sampler.view_type*format*_snorm*_filter.linear

Components: Vulkan

VK-GL-CTS issue: 229

Change-Id: I59fa0f7acdcaa49fc84f17b22be1cc805da593a2