This two games from Raven Software uses same engine. When i apply DXGL to these two games, the games doesnot show Direct3D7 modes that is have 16bit graphic mode.
To test it you can use shareware versions: http://heretics-hexens.ucoz.com/temp/tnp.zip http://heretics-hexens.ucoz.com/temp/magedemo.zip
now it dosenot show anything at all, just starting game and screen remains black all time.