well, there are still some issues with it. for example, it does not use hlsl to create the burnin image, nor does hlsl modify the burnin image. this results in your actual game being modified according to your hlsl settings, but not the burnin image. it becomes impossible to ignore once you notice it.
another thing that requires attention is that you must set -snapsize to something that is suitable for the game. by default, in the limited times I generated burnin images, the burnin image was 299x299, which no game I know of runs at. this means that the burnin image requires post-processing outside of MAME/MESS to correctly shape, scale, and rotate the image before it is usable.
If I still had the artwork I was playing with for this I would share it, but since I started my new job I've had precious little time for gaming.
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