Follow-up question: is there any way for me to know what the aspect ratio of the virtual screen that MAME is putting into the render_target is? If so, I can factor that into my calculation and let MAME lay things out in this virtual screen, but then zoom in a little more to fill the monitor with the game contents with no in-game sidepanels or letterboxing.
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Re: Another annoying MAME code question
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