HLSL: Add ConstantBuffer<T> syntax

Test/hlsl.constantbuffer.frag

+
+struct c1_t {
+    float4 x;
+};
+
+struct c2_t {
+    bool x;
+    float y;
+};
+
+ConstantBuffer<c1_t> cb1 : register(b12);
+ConstantBuffer<c2_t> cb2[3];
+ConstantBuffer<c2_t> cb3[2][4];
+
+cbuffer cbuff {
+    int c1;
+};
+
+float4 main() : SV_Target0
+{
+    if (cb3[1][2].x)
+        return cb1.x + cb2[1].y + c1;
+    else
+        return cb3[2][3].y;
+}
+

glslang/MachineIndependent/iomapper.cpp

@@ -532,6 +532,7 @@ u – for unordered access views (UAV)
 
 b – for constant buffer views (CBV)
    CBUFFER
+   CONSTANTBUFFER
  ********************************************************************************/
 struct TDefaultHlslIoResolver : public TDefaultIoResolverBase
 {

gtests/Hlsl.FromFile.cpp

@@ -98,6 +98,7 @@ INSTANTIATE_TEST_CASE_P(
         {"hlsl.clip.frag", "main"},
         {"hlsl.comparison.vec.frag", "main"},
         {"hlsl.conditional.frag", "PixelShaderFunction"},
+        {"hlsl.constantbuffer.frag", "main"},
         {"hlsl.constructexpr.frag", "main"},
         {"hlsl.depthGreater.frag", "PixelShaderFunction"},
         {"hlsl.depthLess.frag", "PixelShaderFunction"},

hlsl/hlslGrammar.cpp

@@ -476,7 +476,8 @@ bool HlslGrammar::acceptDeclaration(TIntermNode*& nodeList)
                 if (typedefDecl)
                     parseContext.declareTypedef(idToken.loc, *fullName, variableType);
                 else if (variableType.getBasicType() == EbtBlock) {
-                    parseContext.declareBlock(idToken.loc, variableType, fullName);
+                    parseContext.declareBlock(idToken.loc, variableType, fullName,
+                                              variableType.isArray() ? &variableType.getArraySizes() : nullptr);
                     parseContext.declareStructBufferCounter(idToken.loc, variableType, *fullName);
                 } else {
                     if (variableType.getQualifier().storage == EvqUniform && ! variableType.containsOpaque()) {
@@ -1364,6 +1365,9 @@ bool HlslGrammar::acceptType(TType& type, TIntermNode*& nodeList)
         return acceptStructBufferType(type);
         break;
 
+    case EHTokConstantBuffer:
+        return acceptConstantBufferType(type);
+
     case EHTokClass:
     case EHTokStruct:
     case EHTokCBuffer:
@@ -1944,6 +1948,47 @@ bool HlslGrammar::acceptStruct(TType& type, TIntermNode*& nodeList)
     return deferredSuccess;
 }
 
+// constantbuffer
+//    : CONSTANTBUFFER LEFT_ANGLE type RIGHT_ANGLE
+bool HlslGrammar::acceptConstantBufferType(TType& type)
+{
+    if (! acceptTokenClass(EHTokConstantBuffer))
+        return false;
+
+    if (! acceptTokenClass(EHTokLeftAngle)) {
+        expected("left angle bracket");
+        return false;
+    }
+    
+    TType templateType;
+    if (! acceptType(templateType)) {
+        expected("type");
+        return false;
+    }
+
+    if (! acceptTokenClass(EHTokRightAngle)) {
+        expected("right angle bracket");
+        return false;
+    }
+
+    TQualifier postDeclQualifier;
+    postDeclQualifier.clear();
+    postDeclQualifier.storage = EvqUniform;
+
+    if (templateType.isStruct()) {
+        // Make a block from the type parsed as the template argument
+        TTypeList* typeList = templateType.getWritableStruct();
+        new(&type) TType(typeList, "", postDeclQualifier); // sets EbtBlock
+
+        type.getQualifier().storage = EvqUniform;
+
+        return true;
+    } else {
+        parseContext.error(token.loc, "non-structure type in ConstantBuffer", "", "");
+        return false;
+    }
+}
+
 // struct_buffer
 //    : APPENDSTRUCTUREDBUFFER
 //    | BYTEADDRESSBUFFER

hlsl/hlslGrammar.h

@@ -87,6 +87,7 @@ namespace glslang {
         bool acceptSamplerType(TType&);
         bool acceptTextureType(TType&);
         bool acceptStructBufferType(TType&);
+        bool acceptConstantBufferType(TType&);
         bool acceptStruct(TType&, TIntermNode*& nodeList);
         bool acceptStructDeclarationList(TTypeList*&, TIntermNode*& nodeList, TVector<TFunctionDeclarator>&);
         bool acceptMemberFunctionDefinition(TIntermNode*& nodeList, const TType&, const TString& memberName,

hlsl/hlslScanContext.cpp

@@ -331,6 +331,7 @@ void HlslScanContext::fillInKeywordMap()
     (*KeywordMap)["class"] =                   EHTokClass;
     (*KeywordMap)["struct"] =                  EHTokStruct;
     (*KeywordMap)["cbuffer"] =                 EHTokCBuffer;
+    (*KeywordMap)["ConstantBuffer"] =          EHTokConstantBuffer;
     (*KeywordMap)["tbuffer"] =                 EHTokTBuffer;
     (*KeywordMap)["typedef"] =                 EHTokTypedef;
     (*KeywordMap)["this"] =                    EHTokThis;
@@ -827,6 +828,7 @@ EHlslTokenClass HlslScanContext::tokenizeIdentifier()
     case EHTokStruct:
     case EHTokTypedef:
     case EHTokCBuffer:
+    case EHTokConstantBuffer:
     case EHTokTBuffer:
     case EHTokThis:
     case EHTokNamespace:

hlsl/hlslTokens.h

@@ -275,6 +275,7 @@ enum EHlslTokenClass {
     EHTokTypedef,
     EHTokThis,
     EHTokNamespace,
+    EHTokConstantBuffer,
 
     // constant
     EHTokFloatConstant,