Manually merge ClemensRognerSD-dx9-sampler and resolve conflicts.

gtests/Hlsl.FromFile.cpp

@@ -62,6 +62,7 @@ using HlslVulkan1_1CompileTest = GlslangTest<::testing::TestWithParam<FileNameEn
 using HlslCompileAndFlattenTest = GlslangTest<::testing::TestWithParam<FileNameEntryPointPair>>;
 using HlslLegalizeTest = GlslangTest<::testing::TestWithParam<FileNameEntryPointPair>>;
 using HlslDebugTest = GlslangTest<::testing::TestWithParam<FileNameEntryPointPair>>;
+using HlslDX9CompatibleTest = GlslangTest<::testing::TestWithParam<FileNameEntryPointPair>>;
 
 // Compiling HLSL to pre-legalized SPIR-V under Vulkan semantics. Expected
 // to successfully generate both AST and SPIR-V.
@@ -106,6 +107,14 @@ TEST_P(HlslDebugTest, FromFile)
                             "/baseResults/", false, true);
 }
 
+TEST_P(HlslDX9CompatibleTest, FromFile)
+{
+    loadFileCompileAndCheckWithOptions(GlobalTestSettings.testRoot, GetParam().fileName, Source::HLSL,
+                                       Semantics::Vulkan, glslang::EShTargetVulkan_1_0, Target::BothASTAndSpv, true,
+                                       GetParam().entryPoint, "/baseResults/",
+                                       EShMessages::EShMsgHlslDX9Compatible);
+}
+
 // clang-format off
 INSTANTIATE_TEST_CASE_P(
     ToSpirv, HlslCompileTest,
@@ -457,6 +466,15 @@ INSTANTIATE_TEST_CASE_P(
     FileNameAsCustomTestSuffix
 );
 
+INSTANTIATE_TEST_CASE_P(
+    ToSpirv, HlslDX9CompatibleTest,
+    ::testing::ValuesIn(std::vector<FileNameEntryPointPair>{
+        {"hlsl.sample.dx9.frag", "main"},
+        {"hlsl.sample.dx9.vert", "main"},
+    }),
+    FileNameAsCustomTestSuffix
+);
 // clang-format on
+
 }  // anonymous namespace
 }  // namespace glslangtest