Added a method to VertexIndex to determine the size in bytes of an element in the index array

src/modules/graphics/opengl/VertexBuffer.h

@@ -331,10 +331,6 @@ private:
 	// Set if the buffer was modified while operating on gpu memory
 	// and needs to be synchronized.
 	bool is_dirty;
-
-	// Usage hint for map()/unmap() pair. Same as `access' parameter in
-	// glBufferData or 0 if not mapped.
-	GLenum mapped_access;
 };
 
 /**
@@ -409,6 +405,15 @@ public:
 		return getType(maxSize);
 	}
 
+	/**
+	 * Returns the size in bytes of an element in the element array.
+	 * Can be used with getPointer to calculate an offset into the array based
+	 * on a number of elements.
+	 *
+	 * @return The size of an element in bytes.
+	 **/
+	size_t getElementSize();
+
 	/**
 	 * Returns the pointer to the VertexBuffer.
 	 * The pointer will change if a new size request or removal causes
@@ -463,6 +468,9 @@ private:
 	// The size of the array requested by this instance.
 	size_t size;
 
+	// The size in bytes of an element in the element array.
+	size_t elementSize;
+
 	// The current VertexBuffer size. 0 means no VertexBuffer.
 	static size_t maxSize;
 	// The list of sizes. Needs to be kept sorted in ascending order.