Configuration is quite easy : once OpenGL support has been built in Wine, this internal OpenGL driver will be used each time an application tries to load opengl32.dll.
Due to restrictions (that do not exist in Windows) on OpenGL contexts, if you want to prevent the screen to flicker when using OpenGL applications (all games are using double-buffered contexts), you need to set the following option in your ~/.wine/config file in the [x11drv] section :
DesktopDoubleBuffered = Y
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and to run Wine with the --desktop option.