Clean up glVertexAttribPointer calls a bit.

--HG--
branch : minor

src/modules/graphics/vertex.h

@@ -122,6 +122,7 @@ struct XYf_STus_RGBAub
 };
 
 size_t getFormatStride(CommonFormat format);
+uint32 getFormatFlags(CommonFormat format);
 size_t getIndexDataSize(IndexDataType type);
 IndexDataType getIndexDataTypeFromMax(size_t maxvalue);