add parsing of TextureAddressMode for addressU

Author: inbelic

clang/include/clang/Parse/ParseHLSLRootSignature.h

@@ -112,6 +112,7 @@ class RootSignatureParser {
   struct ParsedStaticSamplerParams {
     std::optional<llvm::hlsl::rootsig::Register> Reg;
     std::optional<float> MipLODBias;
+    std::optional<llvm::hlsl::rootsig::TextureAddressMode> AddressU;
     std::optional<uint32_t> MaxAnisotropy;
     std::optional<float> MinLOD;
     std::optional<float> MaxLOD;
@@ -125,6 +126,8 @@ class RootSignatureParser {
 
   /// Parsing methods of various enums
   std::optional<llvm::hlsl::rootsig::ShaderVisibility> parseShaderVisibility();
+  std::optional<llvm::hlsl::rootsig::TextureAddressMode>
+  parseTextureAddressMode();
   std::optional<llvm::hlsl::rootsig::RootDescriptorFlags>
   parseRootDescriptorFlags();
   std::optional<llvm::hlsl::rootsig::DescriptorRangeFlags>

clang/lib/Parse/ParseHLSLRootSignature.cpp

@@ -381,6 +381,9 @@ std::optional<StaticSampler> RootSignatureParser::parseStaticSampler() {
   Sampler.Reg = Params->Reg.value();
 
   // Fill in optional values
+  if (Params->AddressU.has_value())
+    Sampler.AddressU = Params->AddressU.value();
+
   if (Params->MipLODBias.has_value())
     Sampler.MipLODBias = Params->MipLODBias.value();
 
@@ -679,6 +682,23 @@ RootSignatureParser::parseStaticSamplerParams() {
       Params.Reg = Reg;
     }
 
+    // `addressU` `=` TEXTURE_ADDRESS
+    if (tryConsumeExpectedToken(TokenKind::kw_addressU)) {
+      if (Params.AddressU.has_value()) {
+        getDiags().Report(CurToken.TokLoc, diag::err_hlsl_rootsig_repeat_param)
+            << CurToken.TokKind;
+        return std::nullopt;
+      }
+
+      if (consumeExpectedToken(TokenKind::pu_equal))
+        return std::nullopt;
+
+      auto AddressU = parseTextureAddressMode();
+      if (!AddressU.has_value())
+        return std::nullopt;
+      Params.AddressU = AddressU;
+    }
+
     // `mipLODBias` `=` NUMBER
     if (tryConsumeExpectedToken(TokenKind::kw_mipLODBias)) {
       if (Params.MipLODBias.has_value()) {
@@ -849,6 +869,32 @@ RootSignatureParser::parseShaderVisibility() {
   return std::nullopt;
 }
 
+std::optional<llvm::hlsl::rootsig::TextureAddressMode>
+RootSignatureParser::parseTextureAddressMode() {
+  assert(CurToken.TokKind == TokenKind::pu_equal &&
+         "Expects to only be invoked starting at given keyword");
+
+  TokenKind Expected[] = {
+#define TEXTURE_ADDRESS_MODE_ENUM(NAME, LIT) TokenKind::en_##NAME,
+#include "clang/Lex/HLSLRootSignatureTokenKinds.def"
+  };
+
+  if (!tryConsumeExpectedToken(Expected))
+    return std::nullopt;
+
+  switch (CurToken.TokKind) {
+#define TEXTURE_ADDRESS_MODE_ENUM(NAME, LIT)                                   \
+  case TokenKind::en_##NAME:                                                   \
+    return TextureAddressMode::NAME;                                           \
+    break;
+#include "clang/Lex/HLSLRootSignatureTokenKinds.def"
+  default:
+    llvm_unreachable("Switch for consumed enum token was not provided");
+  }
+
+  return std::nullopt;
+}
+
 std::optional<llvm::hlsl::rootsig::RootDescriptorFlags>
 RootSignatureParser::parseRootDescriptorFlags() {
   assert(CurToken.TokKind == TokenKind::pu_equal &&

clang/unittests/Parse/ParseHLSLRootSignatureTest.cpp

@@ -228,7 +228,7 @@ TEST_F(ParseHLSLRootSignatureTest, ValidParseStaticSamplerTest) {
     StaticSampler(s0),
     StaticSampler(s0, maxAnisotropy = 3,
       minLOD = 4.2f, mipLODBias = 0.23e+3,
-      maxLOD = 9000,
+      maxLOD = 9000, addressU = TEXTURE_ADDRESS_MIRROR
     )
   )cc";
 
@@ -252,6 +252,7 @@ TEST_F(ParseHLSLRootSignatureTest, ValidParseStaticSamplerTest) {
   ASSERT_TRUE(std::holds_alternative<StaticSampler>(Elem));
   ASSERT_EQ(std::get<StaticSampler>(Elem).Reg.ViewType, RegisterType::SReg);
   ASSERT_EQ(std::get<StaticSampler>(Elem).Reg.Number, 0u);
+  ASSERT_EQ(std::get<StaticSampler>(Elem).AddressU, TextureAddressMode::Wrap);
   ASSERT_EQ(std::get<StaticSampler>(Elem).MipLODBias, 0.f);
   ASSERT_EQ(std::get<StaticSampler>(Elem).MaxAnisotropy, 16u);
   ASSERT_EQ(std::get<StaticSampler>(Elem).MinLOD, 0.f);
@@ -262,6 +263,7 @@ TEST_F(ParseHLSLRootSignatureTest, ValidParseStaticSamplerTest) {
   ASSERT_TRUE(std::holds_alternative<StaticSampler>(Elem));
   ASSERT_EQ(std::get<StaticSampler>(Elem).Reg.ViewType, RegisterType::SReg);
   ASSERT_EQ(std::get<StaticSampler>(Elem).Reg.Number, 0u);
+  ASSERT_EQ(std::get<StaticSampler>(Elem).AddressU, TextureAddressMode::Mirror);
   ASSERT_EQ(std::get<StaticSampler>(Elem).MipLODBias, 230.f);
   ASSERT_EQ(std::get<StaticSampler>(Elem).MaxAnisotropy, 3u);
   ASSERT_EQ(std::get<StaticSampler>(Elem).MinLOD, 4.2f);

llvm/include/llvm/Frontend/HLSL/HLSLRootSignature.h

@@ -76,6 +76,14 @@ enum class ShaderVisibility {
   Mesh = 7,
 };
 
+enum class TextureAddressMode {
+  Wrap = 1,
+  Mirror = 2,
+  Clamp = 3,
+  Border = 4,
+  MirrorOnce = 5
+};
+
 // Definitions of the in-memory data layout structures
 
 // Models the different registers: bReg | tReg | uReg | sReg
@@ -160,6 +168,7 @@ struct DescriptorTableClause {
 
 struct StaticSampler {
   Register Reg;
+  TextureAddressMode AddressU = TextureAddressMode::Wrap;
   float MipLODBias = 0.f;
   uint32_t MaxAnisotropy = 16;
   float MinLOD = 0.f;