NixOS-configs/modules/wallpaper-engine/materials/util/volumetrics_fullscreen.json

{
	"passes": [{
		"shader": "volumetricsfront",
		"depthwrite": "disabled",
		"depthtest": "disabled",
		"cullmode": "nocull",
		"blending": "additive",
		"combos": {
			"FULLSCREEN": 1
		}
	}]
}