Added support for alternate vector renderers #8491
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Allows to override the default screen vector renderer to other devices. Added an implementation that supports the USB-DVG hardware, which is a digital vector generator you can connect to real X-Y monitors or oscilloscopes.
New settings in mame.ini:
alt_vector_driver (none | usb_dvg)
alt_vector_port (ex: /dev/ttyACM0 or \\.\COM1)
alt_vector_dual (0 | 1) <-- Display on alternate renderer only (0) or alternate render + screen (1)