opengl support for memory64

Author: PhilippMuigg

AUTHORS

@@ -595,3 +595,4 @@ a license to everyone to use it as detailed in LICENSE.)
 * Piotr Wierciński <[email protected]>
 * 郑苏波 (Super Zheng) <[email protected]>
 * James Hu <[email protected]>
+* Philipp Muigg <[email protected]> (copyright owned by Siemens)