[Fix]: some not-added stuff

MobileGL/MG_Util/Types.h

@@ -101,7 +101,7 @@ namespace MobileGL {
     // represents a range of [start, end)
     struct Range1D {
         SizeT start = 0;
-        SizeT end = 0;
+        SizeT end = ~0u;
 
         void Update(SizeT newStart, SizeT newEnd) {
             assert(newStart <= newEnd);
@@ -147,6 +147,30 @@ namespace MobileGL {
         SharedPtr<ObjectType> m_boundObject;
     };
 
+    template <typename ObjectType>
+    class BindingSlotRange1D: public BindingSlot<ObjectType> {
+    public:
+        using TargetEnum = typename ObjectType::TargetEnum;
+
+        BindingSlotRange1D() : BindingSlot<ObjectType>() {}
+        explicit BindingSlotRange1D(TargetEnum target, const Range1D& range = Range1D())
+                : BindingSlot<ObjectType>(target), m_range(range) {}
+
+        Range1D GetRange() const {
+            return m_range;
+        }
+
+        void SetRange(const Range1D& range) {
+            m_range = range;
+        }
+
+        void ClearRange() {
+            m_range = Range1D();
+        }
+    private:
+        Range1D m_range;
+    };
+
     struct Version {
         Int Major;
         Int Minor;