MSAA, FXAA... what does it all mean? What's the difference?

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Which should you use? And despite us all hating FXAA, perhaps using both at the same time has its benefits...

0:00 CS:GO's default settings
0:47 Introduction to aliasing
2:07 MSAA
3:44 FXAA
5:26 WHY NOT BOTH
6:39 Benchmarks
7:30 Other stuff if you're interested

Find the evil worstcase jaggy map here: https://steamcommunity.com/sharedfile...
Valve's GDC PDF here: https://alex.vlachos.com/graphics/Ale...

Benchmark map: https://steamcommunity.com/sharedfile...