HLSL: implement TextureBuffer<type>

Almost equivalent to tbuffer, except members not at global scope.
So, reference is "TextureBuffer_var.member", not simply "member".

hlsl/hlslGrammar.cpp

@@ -1453,6 +1453,10 @@ bool HlslGrammar::acceptType(TType& type, TIntermNode*& nodeList)
         return acceptStructBufferType(type);
         break;
 
+    case EHTokTextureBuffer:
+        return acceptTextureBufferType(type);
+        break;
+
     case EHTokConstantBuffer:
         return acceptConstantBufferType(type);
 
@@ -2127,6 +2131,43 @@ bool HlslGrammar::acceptConstantBufferType(TType& type)
     }
 }
 
+// texture_buffer
+//    : TEXTUREBUFFER LEFT_ANGLE type RIGHT_ANGLE
+bool HlslGrammar::acceptTextureBufferType(TType& type)
+{
+    if (! acceptTokenClass(EHTokTextureBuffer))
+        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;
+    }
+
+    templateType.getQualifier().storage = EvqBuffer;
+    templateType.getQualifier().readonly = true;
+
+    TType blockType(templateType.getWritableStruct(), "", templateType.getQualifier());
+
+    blockType.getQualifier().storage = EvqBuffer;
+    blockType.getQualifier().readonly = true;
+
+    type.shallowCopy(blockType);
+
+    return true;
+}
+
+
 // struct_buffer
 //    : APPENDSTRUCTUREDBUFFER
 //    | BYTEADDRESSBUFFER

hlsl/hlslGrammar.h

@@ -89,6 +89,7 @@ namespace glslang {
         bool acceptTextureType(TType&);
         bool acceptSubpassInputType(TType&);
         bool acceptStructBufferType(TType&);
+        bool acceptTextureBufferType(TType&);
         bool acceptConstantBufferType(TType&);
         bool acceptStruct(TType&, TIntermNode*& nodeList);
         bool acceptStructDeclarationList(TTypeList*&, TIntermNode*& nodeList, TVector<TFunctionDeclarator>&);

hlsl/hlslScanContext.cpp

@@ -345,6 +345,7 @@ void HlslScanContext::fillInKeywordMap()
     (*KeywordMap)["RWByteAddressBuffer"] =     EHTokRWByteAddressBuffer;
     (*KeywordMap)["RWStructuredBuffer"] =      EHTokRWStructuredBuffer;
     (*KeywordMap)["StructuredBuffer"] =        EHTokStructuredBuffer;
+    (*KeywordMap)["TextureBuffer"] =           EHTokTextureBuffer;
 
     (*KeywordMap)["class"] =                   EHTokClass;
     (*KeywordMap)["struct"] =                  EHTokStruct;
@@ -829,6 +830,7 @@ EHlslTokenClass HlslScanContext::tokenizeIdentifier()
     case EHTokRWByteAddressBuffer:
     case EHTokRWStructuredBuffer:
     case EHTokStructuredBuffer:
+    case EHTokTextureBuffer:
     case EHTokSubpassInput:
     case EHTokSubpassInputMS:
         return keyword;

hlsl/hlslTokens.h

@@ -283,6 +283,7 @@ enum EHlslTokenClass {
     EHTokRWByteAddressBuffer,
     EHTokRWStructuredBuffer,
     EHTokStructuredBuffer,
+    EHTokTextureBuffer,
 
     // variable, user type, ...
     EHTokIdentifier,