commit a51d7137ec7e13604c438a63933fe4f6bf986dc4
author Ethan Nicholas <ethannicholas@google.com> Fri Jun 09 10:47:31 2017 -0400
committer Skia Commit-Bot <skia-commit-bot@chromium.org> Mon Jun 12 14:36:10 2017 +0000
tree e7d571c7aad5411468d773a2d753ec6805ef10cc
parent b310fd597fc37dee888cfd5a760c4e156af08a6d

added SPIR-V RelaxedPrecision

Bug: skia:5524
Change-Id: I716b6bb8da95acb72ba71d083eb8b40cafbc6af8
Reviewed-on: https://skia-review.googlesource.com/19266
Reviewed-by: Greg Daniel <egdaniel@google.com>
Commit-Queue: Ethan Nicholas <ethannicholas@google.com>

src/sksl/SkSLSPIRVCodeGenerator.cpp

diff --git a/src/sksl/SkSLSPIRVCodeGenerator.cpp b/src/sksl/SkSLSPIRVCodeGenerator.cpp
index e3786a7..c423a22 100644
--- a/src/sksl/SkSLSPIRVCodeGenerator.cpp
+++ b/src/sksl/SkSLSPIRVCodeGenerator.cpp
@@ -2599,6 +2599,13 @@
     return result;
 }
 
+void SPIRVCodeGenerator::writePrecisionModifier(const Modifiers& modifiers, SpvId id) {
+    if ((modifiers.fFlags & Modifiers::kLowp_Flag) |
+        (modifiers.fFlags & Modifiers::kMediump_Flag)) {
+        this->writeInstruction(SpvOpDecorate, id, SpvDecorationRelaxedPrecision, fDecorationBuffer);
+    }
+}
+
 #define BUILTIN_IGNORE 9999
 void SPIRVCodeGenerator::writeGlobalVars(Program::Kind kind, const VarDeclarations& decl,
                                          OutputStream& out) {
@@ -2650,6 +2657,7 @@
         SpvId type = this->getPointerType(var->fType, storageClass);
         this->writeInstruction(SpvOpVariable, type, id, storageClass, fConstantBuffer);
         this->writeInstruction(SpvOpName, id, var->fName.c_str(), fNameBuffer);
+        this->writePrecisionModifier(var->fModifiers, id);
         if (var->fType.kind() == Type::kMatrix_Kind) {
             this->writeInstruction(SpvOpMemberDecorate, id, (SpvId) i, SpvDecorationColMajor,
                                    fDecorationBuffer);

src/sksl/SkSLSPIRVCodeGenerator.h

diff --git a/src/sksl/SkSLSPIRVCodeGenerator.h b/src/sksl/SkSLSPIRVCodeGenerator.h
index a343905..9944428 100644
--- a/src/sksl/SkSLSPIRVCodeGenerator.h
+++ b/src/sksl/SkSLSPIRVCodeGenerator.h
@@ -111,6 +111,8 @@
     SpvId getPointerType(const Type& type, const MemoryLayout& layout,
                          SpvStorageClass_ storageClass);
 
+    void writePrecisionModifier(const Modifiers& modifiers, SpvId id);
+
     std::vector<SpvId> getAccessChain(const Expression& expr, OutputStream& out);
 
     void writeLayout(const Layout& layout, SpvId target);