Add a workaround for inaccurate interpolants on Adreno 3xx.

Also ensure that sk_FragCoord x and y values are at pixel centers when
workaround is used.

Change-Id: Ib748af9e496a406a50622e00e96e1346cbb5eb26
Reviewed-on: https://skia-review.googlesource.com/97064
Reviewed-by: Brian Osman <brianosman@google.com>
Commit-Queue: Brian Salomon <bsalomon@google.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/src/gpu/GrShaderCaps.cpp b/src/gpu/GrShaderCaps.cpp
index 2ab19478af..6c6e00024f 100644
--- a/src/gpu/GrShaderCaps.cpp
+++ b/src/gpu/GrShaderCaps.cpp
@@ -39,6 +39,7 @@ GrShaderCaps::GrShaderCaps(const GrContextOptions& options) {
     fMustObfuscateUniformColor = false;
     fMustGuardDivisionEvenAfterExplicitZeroCheck = false;
     fCanUseFragCoord = true;
+    fInterpolantsAreInaccurate = false;
     fFlatInterpolationSupport = false;
     fPreferFlatInterpolation = false;
     fNoPerspectiveInterpolationSupport = false;
@@ -115,6 +116,7 @@ void GrShaderCaps::dumpJSON(SkJSONWriter* writer) const {
     writer->appendBool("Must guard division even after explicit zero check",
                        fMustGuardDivisionEvenAfterExplicitZeroCheck);
     writer->appendBool("Can use gl_FragCoord", fCanUseFragCoord);
+    writer->appendBool("Interpolants are inaccurate", fInterpolantsAreInaccurate);
     writer->appendBool("Flat interpolation support", fFlatInterpolationSupport);
     writer->appendBool("Prefer flat interpolation", fPreferFlatInterpolation);
     writer->appendBool("No perspective interpolation support", fNoPerspectiveInterpolationSupport);