[Feat] (MG_State): Add external index getter for each object.

MobileGL/MG_State/GLState/BufferState/BufferObject.cpp

@@ -4,8 +4,8 @@
 namespace MobileGL {
     namespace MG_State {
         namespace GLState {
-            BufferObject::BufferObject()
-                : m_id(0), m_size(0), m_usage(BufferUsage::StaticDraw), m_isMapped(false),
+            BufferObject::BufferObject(Uint externalIndex)
+                : m_externalIndex(externalIndex), m_size(0), m_usage(BufferUsage::StaticDraw), m_isMapped(false),
                   m_mappingAccess(BufferMappingAccessBit::Null), m_dirtyRange({0, 0}), m_mappedRange({0, 0}),
                   m_dataPtr(MakeShared<Data>()) {}
 
@@ -156,6 +156,10 @@ namespace MobileGL {
             Flags<BufferMappingAccessBit> BufferObject::GetMappingAccess() const {
                 return m_isMapped ? m_mappingAccess : BufferMappingAccessBit::Null;
             }
+
+            Uint BufferObject::GetExternalIndex() const {
+                return m_externalIndex;
+            }
         } // namespace GLState
     } // namespace MG_State
 } // namespace MobileGL

MobileGL/MG_State/GLState/BufferState/BufferObject.h

@@ -53,7 +53,7 @@ namespace MobileGL {
             public:
                 using TargetEnum = BufferTarget;
 
-                BufferObject();
+                BufferObject(Uint externalIndex);
 
                 void Resize(SizeT size);
                 void UploadData(DataPtr data, SizeT atOffset);
@@ -73,9 +73,10 @@ namespace MobileGL {
                 Range1D GetMappedRange() const;
                 const SharedPtr<Data> GetDataReadOnly() const;
                 Flags<BufferMappingAccessBit> GetMappingAccess() const;
+                Uint GetExternalIndex() const;
 
             private:
-                Int m_id = 0;
+                const Uint m_externalIndex = 0;
                 SizeT m_size = 0;
                 BufferUsage m_usage = BufferUsage::StaticDraw;
                 SharedPtr<Data> m_dataPtr;

MobileGL/MG_State/GLState/BufferState/BufferState.cpp

@@ -24,7 +24,7 @@ namespace MobileGL {
             }
 
             SharedPtr<BufferObject> BufferState::CreateBufferObject(Uint index) {
-                auto bufferObject = MakeShared<BufferObject>();
+                auto bufferObject = MakeShared<BufferObject>(index);
                 m_bufferObjects[index] = bufferObject;
                 return bufferObject;
             }