mame/bgfx/chains/default.json

{   "name": "Default Nearest-Neighbor Filter",
	"author": "Ryan Holtz",
	"targets": [
		{   "name": "temp",
			"mode": "guest",
			"bilinear": true,
			"user_prescale": true
		}
	],
	"passes": [
		{   "effect": "misc/blit",
			"name": "Copy To Filtered Texture",
			"input": [
				{ "sampler": "s_tex", "texture": "screen" }
			],
			"output": "temp"
		},
		{   "effect": "misc/blit",
			"name": "Final Upscale",
			"input": [
				{ "sampler": "s_tex", "target": "temp" }
			],
			"output": "output"
		}
	]
}