commit a6b92ad1f7b79106caef6a4c721903544f507a02
author cdalton <cdalton@nvidia.com> Mon Apr 11 12:03:08 2016 -0700
committer Commit bot <commit-bot@chromium.org> Mon Apr 11 12:03:08 2016 -0700
tree f91503b26a515e060202000ecd6bb1923de1e7ed
parent 21a465d7f4c5e639044e79971aeaa1194fc73078

Infer sampler precision from pixel config

Adds a "samplerPrecision" method to GrGLSLCaps and updates
GrGLSLProgramBuilder to infer a sampler's precision based on its
config and visibility.

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1846963004

Review URL: https://codereview.chromium.org/1846963004

src/gpu/vk/GrVkCaps.cpp

diff --git a/src/gpu/vk/GrVkCaps.cpp b/src/gpu/vk/GrVkCaps.cpp
index b72a512..5b62a37 100644
--- a/src/gpu/vk/GrVkCaps.cpp
+++ b/src/gpu/vk/GrVkCaps.cpp
@@ -154,6 +154,21 @@
 
     glslCaps->fIntegerSupport = true;
 
+    // Assume the minimum precisions mandated by the SPIR-V spec.
+    glslCaps->fShaderPrecisionVaries = true;
+    for (int s = 0; s < kGrShaderTypeCount; ++s) {
+        auto& highp = glslCaps->fFloatPrecisions[s][kHigh_GrSLPrecision];
+        highp.fLogRangeLow = highp.fLogRangeHigh = 127;
+        highp.fBits = 23;
+
+        auto& mediump = glslCaps->fFloatPrecisions[s][kMedium_GrSLPrecision];
+        mediump.fLogRangeLow = mediump.fLogRangeHigh = 14;
+        mediump.fBits = 10;
+
+        glslCaps->fFloatPrecisions[s][kLow_GrSLPrecision] = mediump;
+    }
+    glslCaps->initSamplerPrecisionTable();
+
     glslCaps->fMaxVertexSamplers =
     glslCaps->fMaxGeometrySamplers =
     glslCaps->fMaxFragmentSamplers = SkTMin(properties.limits.maxPerStageDescriptorSampledImages,