Add initial support for shader binding sets (WIP)

include/Nazara/Shader/Ast/Enums.hpp

@@ -29,6 +29,7 @@ namespace Nz
 			Layout,             //< Struct layout (struct only) - has argument style
 			Location,           //< Location (struct member only) - has argument index
 			Option,             //< Conditional compilation option - has argument expr
+			Set,                //< Binding set (external var only) - has argument index
 		};
 
 		enum class BinaryType

include/Nazara/Shader/Ast/ExpressionType.hpp

@@ -83,7 +83,7 @@ namespace Nz::ShaderAst
 		struct StructMember
 		{
 			std::optional<BuiltinEntry> builtin;
-			std::optional<unsigned int> locationIndex;
+			std::optional<UInt32> locationIndex;
 			std::string name;
 			ExpressionType type;
 		};

include/Nazara/Shader/Ast/Nodes.hpp

@@ -252,7 +252,8 @@ namespace Nz::ShaderAst
 
 		struct ExternalVar
 		{
-			std::optional<unsigned int> bindingIndex;
+			std::optional<UInt32> bindingIndex;
+			std::optional<UInt32> bindingSet;
 			std::string name;
 			ExpressionType type;
 		};