while this started as a sample to demonstrate how to use the new
frame history feature, this is now solid enough to become a feature.
this version of TAA doesn't use motion vectors, so it is prone to
various artifacts (e.g. ghosting). It also has the typical issues
TAA has (e.g. transparents).
with that said, performace is good and quality is overall superior
to FXAA or MSAAx4.
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