MAME fails to attach window with video opengl

[davide125]

On Linux, if MAME is setup to use the opengl video driver (e.g. in mame.ini), it'll fail to start with:

stderr= "OpenGL not supported on this driver: The specified window isn't an OpenGL window\nvideo_init: Initialization failed!\n\n\n"

[davide125]

I suspect this may be solvable by leveraging https://doc.qt.io/qt-5/qopenglwidget.html but I haven't managed to get that working in a quick test.

[npwoods]

There is a similar issue on Windows; the -attach_window technique in practice only keyboard/mouse/lightgun providers is DirectInput, hence some of the stuff on line 33 of runmachinetask.cpp

Perhaps we should be doing something similar on Linux?