Merge pull request #631 from theoreticalphysicsftw/cpp_compat_ref

Make NBL_(CONST)_REF_ARG to work with multi-parameter templates.

Author: devshgraphicsprogramming

include/nbl/builtin/hlsl/cpp_compat.hlsl

@@ -31,8 +31,10 @@ using add_pointer = std::add_pointer<T>;
 
 }
 
-#define NBL_REF_ARG(T) typename nbl::hlsl::add_reference<T>::type
-#define NBL_CONST_REF_ARG(T) typename nbl::hlsl::add_reference<std::add_const_t<T>>::type
+// We need variadic macro in order to handle multi parameter templates because the 
+// preprocessor parses the template parameters as different macro parameters.
+#define NBL_REF_ARG(...) typename nbl::hlsl::add_reference<__VA_ARGS__>::type
+#define NBL_CONST_REF_ARG(...) typename nbl::hlsl::add_reference<std::add_const_t<__VA_ARGS__>>::type
 
 #else
 
@@ -62,8 +64,8 @@ struct add_pointer
 }
 }
 
-#define NBL_REF_ARG(T) inout T
-#define NBL_CONST_REF_ARG(T) const in T
+#define NBL_REF_ARG(...) inout __VA_ARGS__
+#define NBL_CONST_REF_ARG(...) const in __VA_ARGS__
 
 #endif