HLSL: Allow primitive id on hull shader inputs

Test/hlsl.color.hull.tesc

+/////////////
+// GLOBALS //
+/////////////
+cbuffer TessellationBuffer : register(b0)
+{
+    float tessellationAmount;
+    float3 padding;
+};
+
+
+//////////////
+// TYPEDEFS //
+//////////////
+struct HullInputType
+{
+    float3 position : POSITION;
+    float4 color : COLOR;
+};
+
+struct ConstantOutputType
+{
+    float edges[3] : SV_TessFactor;
+    float inside : SV_InsideTessFactor;
+};
+
+struct HullOutputType
+{
+    float3 position : POSITION;
+    float4 color : COLOR;
+};
+
+
+////////////////////////////////////////////////////////////////////////////////
+// Patch Constant Function
+////////////////////////////////////////////////////////////////////////////////
+ConstantOutputType ColorPatchConstantFunction(InputPatch<HullInputType, 3> inputPatch, uint patchId : SV_PrimitiveID)
+{
+    ConstantOutputType output;
+
+
+	// Set the tessellation factors for the three edges of the triangle.
+    output.edges[0] = tessellationAmount;
+    output.edges[1] = tessellationAmount;
+    output.edges[2] = tessellationAmount;
+
+	// Set the tessellation factor for tessallating inside the triangle.
+    output.inside = tessellationAmount;
+
+    return output;
+}
+
+
+////////////////////////////////////////////////////////////////////////////////
+// Hull Shader
+////////////////////////////////////////////////////////////////////////////////
+[domain("tri")]
+[partitioning("integer")]
+[outputtopology("triangle_cw")]
+[outputcontrolpoints(3)]
+[patchconstantfunc("ColorPatchConstantFunction")]
+
+HullOutputType main(InputPatch<HullInputType, 3> patch, uint pointId : SV_OutputControlPointID, uint patchId : SV_PrimitiveID)
+{
+    HullOutputType output;
+
+    // Set the position for this control point as the output position.
+    output.position = patch[pointId].position;
+
+	// Set the input color as the output color.
+    output.color = patch[pointId].color;
+
+    return output;
+}
+

gtests/Hlsl.FromFile.cpp

@@ -133,6 +133,7 @@ INSTANTIATE_TEST_CASE_P(
         {"hlsl.clipdistance-8.vert", "main"},
         {"hlsl.clipdistance-9.frag", "main"},
         {"hlsl.clipdistance-9.vert", "main"},
+        {"hlsl.color.hull.tesc", "main"},
         {"hlsl.comparison.vec.frag", "main"},
         {"hlsl.conditional.frag", "PixelShaderFunction"},
         {"hlsl.constantbuffer.frag", "main"},

hlsl/hlslParseHelper.cpp

@@ -9000,7 +9000,7 @@ bool HlslParseContext::isInputBuiltIn(const TQualifier& qualifier) const
     case EbvVertexIndex:
         return language == EShLangVertex;
     case EbvPrimitiveId:
-        return language == EShLangGeometry || language == EShLangFragment;
+        return language == EShLangGeometry || language == EShLangFragment || language == EShLangTessControl;
     case EbvTessLevelInner:
     case EbvTessLevelOuter:
         return language == EShLangTessEvaluation;