added uint8 IndexType

inc/hgl/graph/VK.h

@@ -136,10 +136,11 @@ inline const uint32_t GetMipLevel(const VkExtent3D &ext)
 /**
  * 索引类型,等同于VkIndexType
  */
-enum IndexType
+enum IndexType:uint
 {
     U16=0,
-    U32
+    U32,
+    U8=VK_INDEX_TYPE_UINT8_EXT,
 };
 
 /**

inc/hgl/graph/VKIndexBuffer.h

@@ -26,8 +26,8 @@ namespace hgl
 
             ~IndexBuffer()=default;
 
-            const IndexType GetType ()const{return index_type;}
-            const uint32    GetCount()const{return count;}
+            const IndexType     GetType ()const{return index_type;}
+            const uint32        GetCount()const{return count;}
         };//class IndexBuffer:public DeviceBuffer
     }//namespace graph
 }//namespace hgl